New 2

DETAILED DESCRIPTION
[Detailed Description of the Invention]
[Field of the Invention]
[0001]
The present invention relates to a plane piezoelectric loudspeaker actuator, and
it is related with the method of making low especially initial frequency of a
plane piezoelectric loudspeaker actuator, It has the symmetrical wing part which
extended and provided the side part of the central part right and left, an
overall length considers it as the length which added the central part to the
right and left wing part, and the whole width considers it as the width of a
wing part, make wing length into the length of a wing part, and let central
width be the width of a central part,
Overall length
---- It is R1>1 when it is =R1;
Whole width
Whole width
-------- It is R2>1 when it is =R2;
Wing length
Wing length
-------- It is =R3 and is R3>1;
Central width
When it is R1=R2=R3=1.618, and the degree of deterioration of the initial
frequency and the display flatness of a frequency response curve reach the best
state and it is overall-length =4.236 central width, It is related with the
method of lowering the initial frequency of a plane piezoelectric loudspeaker
actuator, wherein the degree of deterioration of initial frequency and the
display flatness of a frequency response curve reach the most ideal conditions.
[Background of the Invention]
[0002]
As shown in Fig.9, initial frequency at the time of the use of a common plane
piezoelectric loudspeaker actuator is about 400 Hz or more.
And when a fall emits a sound largely, boom hoisting of the frequency response
curve of the whole, for example about the sound source of low frequency, such as
a male voice, Also when a fluctuation range of frequency is large, it is easy to
be sometimes unable to emit a sound with low voice frequency with bad quality of
an uttered sound, and to generate a frequency characteristic which is not good.
[0003]
If it puts on a Prior art, when the initial frequency and whole length are in
inverse proportion, it does not change the whole length and it combines with the
thing provided with small sound reproduction devices, such as a mobile phone,
Initial frequency cannot be stopped effectively, and since the frequency
response curve of boom hoisting is dramatically large, the audio reproduction
effect will worsen.
[0004]
For this reason, how the frequency characteristic of a low frequency wave is
improved effectively is a technical consideration which the present invention
solves.
[Description of the Invention]
[Problem to be solved by the invention]
[0005]
There is the object of this invention in providing the method of lowering the
initial frequency of a plane piezoelectric loudspeaker actuator that an AF
response can be improved, the whole frequency response curve can be made flat,
and the good sound reproduction effect of a sound with low frequency can be
acquired.
[Means for solving problem]
[0006]
The plane piezoelectric loudspeaker actuator of the present invention, A
piezoelectric thin film is provided to the metal thin film upper and lower sides

including a central part and a wing part, respectively, Install a frame in the
whole surface on a central part, and fix the lead connected with the metal
conductor, and it is constituted, and before long the piezoelectric thin film, A
metal electrode (positive) and a metal electrode (negative) are installed in the
piezoelectric thin film upper and lower sides, respectively. The side part of a
central part is extended right and left, and a symmetrical wing part is
provided, and an overall length is the length which did a right and left wing
part and central part, and whole width is the width of a wing part, make wing
length into the length of a wing part, and let central width be the width of a
central part,
Overall length
Whole width
Whole width
Wing length
Wing length
-------- It is =R3 and is R3>1;
Central width
When it is R1=R2=R3=1.618, the degree of deterioration of the initial frequency
and the display flatness of a frequency response curve reach the best state, and
when it is overall-length =4.236 central width, the degree of deterioration of
initial frequency and the display flatness of a frequency response curve reach
the most ideal conditions.
[Effect of the Invention]
[0007]
In order to clarify the inventive step and practicality of the present invention
more, the practical effect of the present invention is shown below.
1 and an AF response can be improved.
The sound reproduction effect also with 2 and a good sound with low frequency is
acquired.
The frequency response curve of 3 and the whole can be made flat, and the loss
of the reality at the time of sound reproduction can be suppressed.
4 and voice frequency angle tolerance level can be made higher.
5, an inventive step, and practicality are high.
6 and industrial competitive strength can be improved.
[Work example 1]
[0008]
The plane piezoelectric loudspeaker actuator A of the present invention. As
shown in Fig.1, Fig.2, and Fig.3, including the central part A6 and the wing
part A7, the piezoelectric thin film A1 is stuck on the metal thin film A2 upper
and lower sides, respectively, and frame A3 is provided on the whole surface on
the central part A6, and lead A4 connected by metal conductor A5 is fixed, and
it is constituted. The piezoelectric thin film A1 installs the metal electrode
(positive) A11 and the metal electrode (negative) A12 in the piezoelectric thin
film A13 upper and lower sides, respectively.
[0009]
The side part of the central part A6 is extended right and left, and the
symmetrical wing part A7 is provided. As shown in Fig.4, the overall length B1
is made into the width from one end of the right and left wing part A7 to the
other, wing length B3 is made into the length of the wing part A7, and central
width B4 is taken as the width of the central part A6. The following formula
should show,
Overall length
Whole width
Whole width

Wing length
Wing length
-------- It is =R3 and is R3>1;
Central width
When it is R1=R2=R3=1.618, the degree of deterioration of the initial frequency
and the display flatness of a frequency response curve reach the best state, and
when it is overall-length =4.236 central width B4, the degree of deterioration
of initial frequency and the display flatness of a frequency response curve
reach the most ideal conditions.
[0010]
If the wing part A7 is made to increase without changing the overall length and
thickness of the plane piezoelectric loudspeaker actuator A, the starting point
of initial frequency will be deteriorated and a frequency response curve will
approach evenly simultaneously.
[0011]
The wave form chart of dB value corresponding to the frequency of the plane
piezoelectric loudspeaker actuator A of the present invention is shown in Fig.8.
As shown in the figure, resonance can already be generated at the time of 250
Hz, and a good frequency response can be obtained to low voice frequency. The
curve at the time of the resonance shown in the figure is flat, the distance
between each height peak of a resonance response waveform figure is near, also
when the fluctuation amount of voice frequency is large, the response rate of
change is low, and the stable good frequency characteristic can be maintained.
[0012]
As shown in Fig.5 and Fig.5-1, after a signal is sent to the plane piezoelectric
loudspeaker actuator A, via the resonance waves of the resonance which the
piezoelectric thin film A1 and the metal thin film A2 generate, the plane
piezoelectric loudspeaker actuator A of the present invention is transmitted to
cone paper C or the plate D through frame A3, and utters a sound. Before long,
let the plates D be plates, such as a wood slab, a metal plate, an acrylic
board, a rubber plate, and a paper board, further.
[Work example 2]
[0013]
As shown in Fig.6 and Fig.6-1, the plane piezoelectric loudspeaker actuator E
shall use the piezoelectric thin film E2 on the metal thin film E1 as the
piezoelectric thin film E2 of three more layers, five layers, or the layer
beyond it, and shall have the same function as ****. The piezoelectric thin film
E2 on the metal thin film E1 shall also be provided only on one side, and shall
have the same function as ****.
[Work example 3]
[0014]
As shown in Fig.7, the plane piezoelectric loudspeaker actuators F and G of the
present invention. More greatly than the ratio of central part F1 and G1, the
ratio of the wing parts F2 and G2 can provide the symmetrical wing parts F2 and
G2 to plurality, such as a ladder form, a rectangle, circular, and a triangle,
central part F1, and G1, can make initial frequency low similarly, and can make
a frequency response curve flat.
[0015]
As mentioned above, since the present invention is satisfying the requirements
for patent application, it carries out patent application here based on Patent
Law.
[Brief Description of the Drawings]
[0016]
[Drawing 1]It is a solid perspective view of the present invention.
[Drawing 2]It is an exploded view of the present invention.
[Drawing 3]It is a cross sectional view of the present invention.
[Drawing 4]It is a plan view of the present invention.
[Drawing 5]It is a solid perspective view showing the working example 1 of the
present invention.
[Fig.5-1] It is the solid perspective view and the elements on larger scale
showing the working example 1 of the present invention.
[Drawing 6]It is the side view and the elements on larger scale showing the

working example 2 of the present invention.
[Fig.6-1] In the working example 2 of the present invention, it is the side view
and the elements on larger scale showing the state where the piezoelectric thin
film was installed only in one side of a metal thin film.
[Drawing 7]It is a plan view showing the working example 3 of the present
invention.
[Drawing 8]It is a test wave form chart of the present invention.
[Drawing 9]It is a test wave form chart of a prior art.
[Explanations of letters or numerals]
[0017]
A plane piezoelectric loudspeaker actuator
A1 Piezoelectric thin film
A11 Metal electrode (positive)
A12 Metal electrode (negative)
A2 Metal thin film
A3 Frame
A4 Lead
A5 Metal conductor
A6 Central part
A7 wing part
B1 Overall length
B-2 Whole width
B3 Wing length
B4 Central width
C cone paper
D plate
E, F, G plane piezoelectric loudspeaker actuator
E1 Metal thin film
E2 and E3 Piezoelectric thin film
F1 and G1 Central part
F2, G2 wing part
move to contents.
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Detail
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CLAIMS
TECHNICAL FIELD
PRIOR ART
EFFECT OF THE INVENTION
TECHNICAL PROBLEM
MEANS
DESCRIPTION OF DRAWINGS

DRAWINGS
* NOTICES *
JPO and INPIT are not responsible for any
damages caused by the use of this translation.
1.This document has been translated by computer. So the translation may not
reflect the original precisely.
2.**** shows the word which can not be translated.
3.In the drawings, any words are not translated.
[0001]
The present invention is the receiver provided with one sound utterance part for
mainly uttering a voice information and transmiting to an internal ear, and
relates to a receiver with the congruence course communicative function using
both the course depended on an air conduction course in detail, and the course
depended on a cartilage conduction course.
[0002]
Conventionally, as a basic function of a receiver, two kinds such as the thing
of an air conduction system and the thing of a bone conduction system are
generally known by the utilizing method of the vibration body which accomplishes
a sound utterance part (loudspeaker). The receiver by an air conduction system
is designed to transmit a voice information to an internal ear via the air
conduction through the middle ear sound conduction system which applies a
vibration body to the inlet part of external auditory meatus, and contains
external auditory meatus and the eardrum in it. The receiver by a bone
conduction system is designed by press-fitting a vibrator to the skin on osseous
tissues, such as a mastoid process part behind an ear, and a mandible, to
transmit a voice information to an internal ear directly, without passing a
middle ear sound conduction system via an osseous tissue.
[0003]
Although many receivers by an air conduction system are used general-purpose, as
well-known technology relevant to the receiver by a bone conduction system, a
bone conduction head set is mentioned, for example (see Patent Document 1). This
bone conduction head set puts a bone conduction speaker on places other than the
inlet part of external auditory meatus, and it has come to be able to perform
listening of the voice information by bone conduction sound, with external
auditory meatus opened wide.
[0004]
[Patent document 1] JP,2003-18683,A (a summary, the 2nd page - the 3rd page,
Fig.4, Fig.7)
[Description of the Invention]
[Problem to be solved by the invention]
[0005]
It is what hears the voice information by bone conduction sound in the case of
the bone conduction head set concerning the Patent document 1 mentioned above
with external auditory meatus opened wide, It enters as an air conduction sound
from the inlet part of the external auditory meatus by which this ambient noise
is opened wide if the circumference has ambient noise, Since the audio signal
often transmited to an internal ear as bone conduction sound may be masked by
the environmental noise transmited to an internal ear via external auditory
meatus, there is a problem of not being suitable for use, for example under an
operating environment with high noise levels, such as a platform of a means of
transportation.
[0006]
Then, if the use under an operating environment with a high noise level is
difficult in the case of such a bone conduction head set, If it is operated so
that the inlet part of external auditory meatus may be simultaneously blockaded
with a finger when a user applies and hears a bone conduction speaker in the
mastoid process part of the rear side of an ear pinna, etc., can cope with the
problem of masking by an environmental noise, but. Thus, it is an inconvenient
thing accompanied by **** in the handling top of a receiver to require the time
and effort of operation by a user separately according to the bottom of an

operating environment. Since bone conduction sound is generally inferior in
respect of tone quality or an articulation score compared with an air conduction
sound. Since the point which excels the mind conduction loudspeaker (or receiver
using it) in the present bone conduction speaker (or receiver using it) says
that it is few, it also has the problem that are utilizing the basic function of
a bone conduction system sufficiently, and it is not breaking.
[0007]
It was made that the present invention should solve such a problem, and the
technical problem can carry out voice listening by natural tone quality with the
sufficient articulation score irrespective of the bottom of operating
environments when an external noise level is high, and there is handling in
providing a simple receiver.
[Means for solving problem]
[0008]
In the receiver which it had, one sound utterance part for according to the
present invention, uttering a voice information and transmiting to an internal
ear a sound utterance part, A receiver with the congruence course communicative
function using both the first transmission-of-sound course depended on the air
conduction course for transmiting a voice information to an internal ear via
external auditory meatus and a middle ear and the second transmission-of-sound
course depended on the cartilage conduction course for transmiting a voice
information to an internal ear via the conchal cartilage and a temporal bone is
obtained.
[0009]
According to the present invention, in the above-mentioned receiver, when a
congruence course communicative function fluctuates the power press-fitted to
the conchal cartilage of a sound utterance part, the receiver which can
adjustment change the ratio of the transmission-of-sound level in the first
transmission-of-sound course and second transmission-of-sound course of the
voice information transmited to an internal ear is obtained.
[0010]
According to the present invention, any of the vibration body with which a sound
utterance part compounds a piezoelectric bimorph and a flexible substance in
which receiver of the above, the vibration body which compounds a piezo-electric
uni-morph and a flexible substance, and an electromagnetic type of vibration
body, or the receiver whose number is one is obtained.
[0011]
In addition, according to the present invention, in the above-mentioned
receiver, the receiver provided with the supporting part for making a vibration
body approach the inlet part of external auditory meatus, and making an ear
pinna contact is obtained.
[0012]
On the other hand, according to the present invention, voice-communications
apparatus provided with any of the above or one receiver, telephone, or an
acoustic-sense auxiliary device is obtained.
[Effect of the Invention]
[0013]
The first transmission-of-sound course that transmits a voice information to an
internal ear by an air conduction course by placing the vibration body
(loudspeaker) which accomplishes a sound utterance part to the inlet part of
external auditory meatus in the case of the receiver of the present invention,
In a being [ it was based on having a congruence course communicative function
using both of second transmission-of-sound courses which transmit a voice
information to an internal ear by a cartilage conduction course via a bone from
a cartilage by making a vibration body press-fit to the conchal cartilage, and
also / congruence ] course communicative function, Since adjustment change of
the ratio of the transmission-of-sound level in the first transmission-of-sound
course and second transmission-of-sound course of the voice information
transmited to an internal ear by fluctuating the power press-fitted to the
conchal cartilage of a sound utterance part is enabled, By becoming what does
not belong like the conventional receiver under the category of any of an air
conduction system or a bone conduction system, and has these basic functions
appropriately, It comes to be able to carry out voice listening by natural tone
quality with the sufficient articulation score irrespective of the bottom of

operating environments when an external noise level is high, and it will become
simple, and also about the basic function of a bone conduction system, there is
nothing to the former, and handling harnesses sufficiently, and comes to break.
[Best Mode of Carrying Out the Invention]
[0014]
In [ the receiver concerning the best form of the present invention is in the
basic constitution provided with one sound utterance part for uttering a voice
information and transmiting to an internal ear, and ] a sound utterance part,
The congruence course communicative function using both the first transmission-
of-sound course depended on the air conduction course for transmiting a voice
information to an internal ear via external auditory meatus and a middle ear and
the second transmission-of-sound course depended on the cartilage conduction
course for transmiting a voice information to an internal ear via the conchal
cartilage and a temporal bone is given. However, as for this congruence course
communicative function, it is desirable for adjustment change of the ratio of
the transmission-of-sound level in the first transmission-of-sound course and
second transmission-of-sound course of the voice information transmited to an
internal ear to be possible by fluctuating the power press-fitted to the conchal
cartilage of a sound utterance part. The vibration body which compounds a
piezoelectric bimorph and a flexible substance with a sound utterance part, It
is possible to use any one of the vibration body which compounds a piezo-
electric uni-morph and a flexible substance, and an electromagnetic type of the
vibration bodies, and it is preferable on structure to have a supporting part
for making such a vibration body approach the inlet part of external auditory
meatus, and making an ear pinna contact further.
[0015]
Namely, the receiver of the present invention is based on using the vibration
body of the electroacoustic transducer which comprises an electromagnetic mold,
a piezo-electricity type, etc. as a sound utterance part, Although it has a
congruence course communicative function which transmits a voice information to
an internal ear via both the first transmission-of-sound course that depends the
air-borne sound wave emitted from one vibration body, and an acoustic
oscillation on an air conduction course, respectively, and the first
transmission-of-sound course depended on a cartilage conduction course, The
dimension of a vibration body here can be made comparable as the width of an ear
pinna, or length, and although it is used, pressing against an ear pinna, it is
convenient. Since the ratio of the transmission-of-sound level of the voice
information in an air conduction course and a cartilage conduction course can be
adjusted by fluctuating the power which presses a vibration body against an ear
pinna, The noise amount from the outside which enters in external auditory
meatus may be appropriately adjusted according to the bottom of an operating
environment, For example, it intercepts that make the transmission-of-sound
level of the voice information which it depends on a cartilage conduction course
as an external noise amount press-fits a receiver to an ear pinna strongly under
a large operating environment increase, and an outside noise enters in external
auditory meatus, Conversely, the voice information which the transmission-of-
sound level of a voice information with which it is transmited to the conchal
cartilage as an external noise amount weakens the power which presses a receiver
against an ear pinna under a quiet small operating environment is decreased, and
is depended on the physiological air conduction course is made into a subject,
And as the inlet part of external auditory meatus is not closed completely,
natural sound feeling can be acquired. Therefore, according to the receiver to
apply, an external noise level is not [ how ] scrupulous and it can carry out
voice listening by natural tone quality with a simply sufficient articulation
score.
[0016]
Fig.1 is a mimetic diagram showing signs that the voice vibration by the
vibrator 11 of the rectangular plate shape used for the receiver of the present
invention is transmited to the sensory cell of an internal ear. Fig.2 is a
mimetic diagram showing the state where this vibration body 11 was pressed
against the ear pinna 12, from the front direction of an ear. However, the form
of the vibration body 11, a size, and arrangement (position) are not limited to
the illustrated form.
[0017]

The following describes how where the vibration body 11 is appropriately pressed
against the ear pinna 12, voice vibration is perceived as an acoustic sense in
the ear of a human body with reference to such Fig.1 and Fig.2. However,
electric wire connection is omitted in Fig.1 and Fig.2.
[0018]
First, the vibration body 11 here is a sound utterance part which converts the
electrical signal which put the voice information to a mechanical vibration, It
compounds a piezoelectric bimorph and a flexible substance, compounds a piezo-
electric uni-morph and a flexible substance, or comprises an electromagnetic
mold electroacoustic transducer, and has an electroacoustic transduction
function about all.
[0019]
In the first transmission-of-sound course depended on the air conduction course
of a voice information, If the voice vibration which occurred in the vibration
body 11 vibrates the eardrum 22 via the air of the external auditory meatus 21
of the ear pinna 12 which exists in the center substantially and this vibration
is transmited to the auditory ossicle 23 which comprises a malleus, an incus,
and stapes, It converts to a weak electrical signal by the sensory cell which
the cochlea 25 has through the fenestra vestibuli 24, and by the ** cochlear
nevers (auditory nerve) 26, it is sent to a brain and recognized as a sound
within a brain.
[0020]
In the second transmission-of-sound course depended on the cartilage conduction
course of a voice information, the voice vibration from the vibration body 11
conducts to the ear pinna 12 or the cartilage of a tragus. Since these
cartilages are connected with the temporal bone, the voice vibration conducted
to the cartilage reaches an internal ear, after being transmitted to a temporal
bone, after converting to an electrical signal by the sensory cell in the
cochlea 25, by the cochlear never (auditory nerve) 26, is sent to a brain and
recognized as a sound within a brain.
[0021]
Fig.3 is the mimetic diagram having made the external ear the section and in
which showing it, in order to describe the second transmission-of-sound course
depended on the cartilage conduction course of the ear for which the vibration
body 11 is used.
[0022]
About these second channels of communication, it describes still in detail with
reference to Fig.3. Although the air 31 was filled by the external auditory
meatus 21 shown in previous Fig.1, the cartilaginous septum 32 which comprises
the conchal cartilage and a tragus cartilage existed in the circumference of the
outside of the external auditory meatus 21 and the inside (back side) is
connected with the bony septum (temporal bone) 33, in the transmission-of-sound
course via cartilage conduction, the air 31 of the external auditory meatus 21
is not passed.
[0023]
Then, if the vibration body 11 is strongly pressed to the ear pinna 12 under an
operating environment with a large noise level, in the second transmission-of-
sound course depended on a cartilage conduction course, The transmission-of-
sound level of a voice information increases, and near the inlet part of the
external auditory meatus 21 is covered at a part of tragus or ear pinna 12, the
inlet part of external auditory meatus is intercepted with outside, and an
external noise etc. become difficult to enter in the external auditory meatus
21. Therefore, by pressing the vibration body 11 to the ear pinna 12 strongly
under an operating environment with a large noise level, entering into the
external auditory meatus 21 of an external noise can be inhibited, and the audio
signal accompanying cartilage conduction can be increased. In an operation of
such both, a signal-noise ratio (S/N ratio) improves substantially conjointly,
and an audio articulation score comes to improve.
[0024]
On the other hand, if the vibration body 11 is lightly pressed against an ear
pinna under a quiet operating environment, in the second transmission-of-sound
course depended on a cartilage conduction course, The transmission-of-sound
levels of the voice information transmitted to a cartilage decrease in number,
and the ratio in the direction of the transmission-of-sound level of the voice

information in the first transmission-of-sound course depended on the air
conduction course which is a physiological transmission-of-sound course
enlarges, And since the inlet part of the external auditory meatus 21 is not
completely blockaded by that the crimping force of the vibration body 11 is
weak, natural sound listening without the feeling of **** which made air
conduction the subject can be performed.
[Work example 1]
[0025]
Fig.4 is a perspective view showing voice-communications apparatus provided with
the receiver concerning the working example 1 of the present invention.
[0026]
The vibration body 11 of rectangular plate shape is attached to the outer
surface of the housing 43 of various telephones, such as a cellular phone, PHS,
and a fixed-line telephone machine, via the elastic member 44, and this voice-
communications apparatus is constituted. Incidentally, the elastic member 44
here functions as a supporting part for making the vibration body 11 approach
the inlet part of the external auditory meatus 21, and making the ear pinna 12
contact.
[0027]
this vibration body 11 is what comprises a piezoelectric bimorph and a flexible
substance -- that dimension -- 32 mm[ in length ] x width 8mmx -- it is 4mm in
thickness. The piezoelectric ceramic plate was adhered to both sides of the SIMM
which comprises a metal elastic plate, and also the constructional detail of the
vibration body 11 is the structure of the piezoelectric bimorph further formed
in the both sides as a coating layer whose polyurethane as a flexible substance
is about 2 mm in thickness.
[0028]
When one piezoelectric ceramic plate develops to a longitudinal direction,
bimorph vibration generates the basic motion of the vibration body 11 by
carrying out voltage impressing so that the piezoelectric ceramic plate of
another side may contract to a longitudinal direction. Resonance frequency and Q
value are set up with the thickness of the coating layer of polyurethane, and it
is designed to satisfy the acoustic radiation characteristic in both the first
transmission-of-sound course depended on an air conduction course, and the
second transmission-of-sound course depended on a cartilage conduction course.
However, the form or dimension or the construction material of SIMM, the method
of adhesion, etc. are not limited to what was illustrated as basic structure of
the vibration body 11.
[0029]
The first transmission-of-sound course depended on the air conduction course
which a user adjusts the power which presses the vibration body 11 against the
ear pinna 12 in support of the housing 43 by hand in the case of this voice-
communications apparatus, and transmits a voice information to an internal ear
via the external auditory meatus 21 and a middle ear, By adjusting the ratio of
the transmission-of-sound level in the second transmission-of-sound course
depended on the cartilage conduction course which transmits a voice information
to an internal ear via the cartilaginous septum 32 and the bony septum (temporal
bone) 33 of the conchal cartilage, the noise level from the outside can be coped
with according to the bottom of an operating environment.
[0030]
It may be made pressing strongly at the place where the noise levels in the road
case with much platform of a means of transportation or traffic, etc. are high,
speaking specifically, In such a case, voice vibration is transmitted to the
cartilaginous septum 32 of the conchal cartilage largely, moreover, since the
external auditory meatus 21 is closed, the noise from the outside is barred, its
S/N ratio improves, and the articulation score in the speech sound of a voice
information comes to go up it.
[0031]
On the other hand, the power pressed at the place where a noise level is
comparatively low may be weakened, Since the voice vibration which is
transmitted to the cartilaginous septum 32 of the conchal cartilage in such a
case decreases, and the voice information from the first transmission-of-sound
course depended on the air conduction course which is a physiological
transmission-of-sound course relatively increases and the external auditory

meatus 21 is not closed completely, natural sound feeling is acquired.
[0032]
As shown in Fig.2, it is to the foundations of a busy condition to acquire the
state where the longitudinal direction of the vibration body 11 intersects the
vibration body 11 perpendicularly substantially to the vertical direction of the
ear pinna 12, but. Since audibility which originates in the form of the ear
pinna 12 and is different will be obtained if it arranges so that the direction
of the longitudinal direction of the vibration body 11 may be changed, it is
desirable to choose a suitable direction at the time of actual use.
[Work example 2]
[0033]
Fig.5 is a perspective view showing the receiver concerning the working example
2 of the present invention. The pair of thing of the vibration body 11 of a
piezoelectric bimorph was elastically supported by the housing 55, and also this
receiver is constituted as headphone for electronic devices, when it switches,
respectively and both of ends fix to the head fixing band 57 for regio
occipitalis capitis via the mold spring mechanism 56. Incidentally, it functions
as a supporting part the housing 55 here and for the mold spring mechanism 56
cooperating by switching, making the vibration body 11 approach the inlet part
of the external auditory meatus 21, and making the ear pinna 12 contact.
[0034]
When using this headphone type of receiver, those both ends may be arranged
above the ear pinna 12, making the regio occipitalis capitis abut the body part
of the head fixing band 57, and the ear pinna 12 may be made to abut the pair of
vibration body 11 from the transverse plane of the external auditory meatus 21,
respectively. The first transmission-of-sound course depended on the air
conduction course which transmits a voice information to an internal ear via the
external auditory meatus 21 and a middle ear like the case where adjusted the
power in which switched and the vibration body 11 abutted the ear pinna 12 with
the mold spring mechanism 56 at this time, and it describes in working example
1, By adjusting the ratio of the transmission-of-sound level in the second
transmission-of-sound course depended on the cartilage conduction course which
transmits a voice information to an internal ear via the cartilaginous septum 32
and the bony septum (temporal bone) 33 of the conchal cartilage, the noise level
from the outside can be coped with according to the bottom of an operating
environment.
[0035]
Therefore, also in this headphone type of receiver, like the case where it
describes in working example 1, By pushing strongly at the place where a noise
level is high, and hitting, the noise from the outside is barred and a S/N ratio
improves, It is made for the articulation score in the speech sound of a voice
information to go up, and by weakening the power to press, the voice information
from a first transmission-of-sound course increases, and natural sound feeling
can be acquired at the place where a noise level is comparatively low.
[0036]
In the case of the receiver concerning the voice-communications apparatus
concerning the working example 1 mentioned above, or the working example 2, the
case where a piezoelectric bimorph was used for the vibration body 11 was
described, but it is also possible to replace with a piezoelectric bimorph and
to use a piezo-electric uni-morph. As the vibration body 11, even if it uses an
electromagnetic mold electroacoustic transducer, setting out which adjusted the
ratio of the transmission-of-sound level in the first transmission-of-sound
course similarly depended on an air conduction course according to the bottom of
an operating environment and the second transmission-of-sound course depended on
a cartilage conduction course, and was suitable for the noise level from the
outside can be performed. Although the form of the vibration body 11 was
described as rectangular, The first transmission-of-sound course depended on an
air conduction course about the vibration body 11 according to the size of the
ear pinna 12 and the second transmission-of-sound course depended on a cartilage
conduction course are sufficiently securable, and. If the conditions which may
plug up the inlet part of the external auditory meatus 21 with a tragus etc. by
adjusting the power pressed against the ear pinna 12 according to the noise
level from the outside are fulfilled, the kind, form, a size, and arrangement
(position) will not be limited to the thing of the form mentioned above.

[Industrial applicability]
[0037]
In the case of the receiver of the present invention, application to telephone
as voice-communications apparatus mentioned above or the receiver for electronic
devices is effective, and also application to the acoustic-sense auxiliary
device represented by the auxiliary equipment for hearing-impaired persons, such
as hearing aid, is effective.
[Brief Description of the Drawings]
[0038]
[Drawing 1]The voice vibration by the vibrator of the rectangular plate shape
used for the receiver of the present invention is a mimetic diagram showing
signs that it transmits to the sensory cell of an internal ear.
[Drawing 2]The vibration body shown in Fig.1 is a mimetic diagram showing the
state where it was pressed against the ear pinna, from the front direction of an
ear.
[Drawing 3]In order to describe the transmission-of-sound course depended on the
cartilage conduction course of the ear for which the vibration body shown in
Fig.1 is used, it is the mimetic diagram having made the external ear the
section and in which showing it.
[Drawing 4]It is a perspective view showing voice-communications apparatus
provided with the receiver concerning the working example 1 of the present
invention.
[Drawing 5]It is a perspective view showing the receiver concerning the working
example 2 of the present invention.
[Explanations of letters or numerals]
[0039]
11 Vibration body
12 Ear pinna
21 External auditory meatus
22 Eardrum
23 Auditory ossicle
24 Fenestra vestibuli
25 Cochlea
26 Cochlear never (auditory nerve)
31 Air
32 Cartilaginous septum
33 Bony septum
43 Housing
44 Elastic member
55 Housing
56 Changed type spring mechanism
57 Occipital anchorage band
Representative drawing
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Representative drawing 1 2 3 4 5
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Selected Gazette
JP,2000-333296,A
PAJ
Detail
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CLAIMS
TECHNICAL FIELD
PRIOR ART
TECHNICAL PROBLEM
MEANS
DRAWINGS
* NOTICES *
[0001]
[Field of the Invention]The present invention relates to the piezoelectric
sounding body used for electronic devices, such as telephone and AV equipment.
[0002]
[Description of the Prior Art]Conventionally, what was described in JP,H10-
112898,A is known, and this kind of piezoelectric sounding body was constituted
as shown in the cross sectional view of Fig.21.
[0003]First, the piezoelectric ceramic plate 10 in which the electrode was
formed to rear surface both sides is joined to one side or both sides of the
metal plate 40, The outer edge section of this metal plate 40 is held with the
upper case 5 and the lower case 1 which provided the sound hole 2, and the leads
41a and 41b connected to the aforementioned piezoelectric ceramic plate 10 and
the metal plate 40 are pulled out from some of upper cases 5 or lower cases 1,
and it is constituted.
[0004]
[Problem to be solved by the invention]However, since the metal plate was used,
it was easy to generate high order resonance at the time of vibration, and the
above-mentioned conventional piezoelectric sounding body had the problem that a
distortion rate (rate in which the sound pressure of unnecessary frequency is
contained to the sound pressure of required fundamental frequency) was high.
[0005]The present invention removes the above conventional defects and an object
of the present invention is to provide a piezoelectric sounding body with a low
distortion rate.
[0006]
[Means for solving problem]To achieve the above objects, the piezoelectric
sounding body of the present invention is considered as the composition which
carried out fixed holding of the peripheral edge part of the insulating film
which joined the piezoelectric ceramic plate which has an electrode to both
sides to at least one side between the above-mentioned the upper and lower case.
[0007]By having this composition, high order resonance can be inhibited and the
piezoelectric sounding body which excelled [ rate / of low distortion ] in the
acoustic feature can be obtained.

[0008]
[Mode for carrying out the invention]An upper case with the sound hole which the
invention of the present invention according to claim 1 has a concave part on
the lower surface, and follows this concave part, It becomes the upper surface
from a lower case with a concave part, and the insulating film which joined the
piezoelectric ceramic plate which has an electrode to both sides to at least one
side, Fixed holding of the peripheral edge part of this insulating film is
carried out between the above-mentioned the upper and lower case, unnecessary
high order resonance can be inhibited and the acoustic feature which reduced the
distortion rate and was excellent can be acquired.
[0009]The invention of the present invention according to claim 2 is the
piezoelectric sounding body according to claim 1 which combined the
piezoelectric ceramic plate with both sides of the insulating film, and can
obtain high-output sound pressure further by low distortion.
piezoelectric sounding body according to claim 1 which provided the electric
conduction pattern electrically connected with the electrode of a piezoelectric
ceramic plate at an insulating film, An electrical signal can be added to a
piezoelectric ceramic plate via the electric conduction pattern of an insulating
film, and connection with an external terminal can also be made easy.
[0011]The invention of the present invention according to claim 4 provides a
step part to the junction of the upper and a lower case, It is the piezoelectric
sounding body according to claim 1 which carried out fixed holding of the
peripheral edge part or projected part of an insulating film by this step part,
and an insulating film can be fixed with accuracy sufficient to the position of
aforementioned upper and lower case, and the variation in sound pressure can be
reduced.
piezoelectric sounding body according to claim 1 which electrically connected
the electric conduction pattern provided to the insulating film to the terminal
held with the upper and a lower case, The electrical signal input from the
terminal is connected to a piezoelectric ceramic plate via the electric
conduction pattern provided to the insulating film, and in order not to carry
out the mechanical connections of the terminal to a piezoelectric ceramic plate
directly, the acoustic feature where were not transmitted the load which
inhibits vibration of a piezoelectric ceramic plate, and it was stabilized is
acquired.
[0013]The invention of the present invention according to claim 6 combines a
piezoelectric ceramic plate with one side of an insulating film, It is the
piezoelectric sounding body according to claim 1 which provided the hard layer
into the portion corresponding to the piezoelectric ceramic plate of the other
side of this insulating film, and since the bias of vibration direction (upper
and lower sides) is reduced by this hard layer, high-output sound pressure can
be further obtained by low distortion.
[0014]The invention of the present invention according to claim 7 provides the
protruding part projected to the method of outside to several places of the
peripheral edge part of an insulating film, It is the piezoelectric sounding
body according to claim 1 which inserted this protruding part in the concave
part provided to either of the junctions of the upper and a lower case, and made
it hold, By holding the protruding part of the peripheral edge part of the
aforementioned insulating film, elastic support can be performed, the vibration
suppression in a supporting part can be reduced, and output sound pressure can
be improved.
piezoelectric sounding body according to claim 1 which constituted the
insulating film from a film of the color discriminable from a piezoelectric
ceramic plate, In a position shift, workability and assembling accuracy become
being easy to detect in the lamination of the aforementioned insulating film and
a piezoelectric ceramic plate, and conducting positioning good.
sound hole to a lower case, is the piezoelectric sounding body according to
claim 1 which attached acoustic resistance material to this sound hole, and can
acquire the acoustic feature excellent in the wide frequency band by
constituting this acoustic resistance material.

protruded piece extended at the case side of the other to the peripheral wall
part of either one of the upper and a lower case, It is the piezoelectric
sounding body according to claim 1 which carried out thermal caulking of the tip
of this protruded piece, and combined the upper and a lower case, and since the
aforementioned the upper and lower case can be fixed easily, without using
adhesives, workability is good and productivity is good.
piezoelectric sounding body according to claim 1 which combined the upper and a
lower case by the coupling member combined with a peripheral edge part, since it
can fix easily the aforementioned the upper and lower case, without using
adhesives, workability is good and its productivity is good.
piezoelectric sounding body according to claim 1 considered as the composition
which combines the upper and a lower case by fitting, other parts and materials
for joining together are unnecessary, workability is good, and its productivity
is good.
piezoelectric sounding body according to claim 3 which provided every two
electric conduction patterns connected with the electrode of both sides of a
piezoelectric ceramic plate to both sides of an insulating film, respectively,
An electrical signal can be easily connected to a piezoelectric ceramic plate
via every two aforementioned electric conduction patterns, and the circuit board
of apparatus and mechanical connections with an external terminal are also easy.
extension projected to the method of outside to a part of peripheral edge part
of an insulating film, An electrical signal is easily connectable with a
piezoelectric ceramic plate via the electric conduction pattern of this
extension, The circuit board of apparatus and mechanical connections with an
external terminal are also still easier, and in order not to carry out the
mechanical connections of the terminal to a piezoelectric ceramic plate
directly, the load which inhibits vibration of a piezoelectric ceramic plate is
not been transmitted, but the stable acoustic feature is acquired.
piezoelectric sounding body according to claim 4 to which the step part of the
upper and a lower case was made to weld and carry out fixed holding of the
peripheral edge part of an insulating film, and its accuracy of a fixed position
is good and it can reduce the variation in sound pressure.
[0023]The peripheral edge part of an insulating film can be made into the bent
form, it is the piezoelectric sounding body according to claim 4 which pinched
this flection by the step part of the upper and a lower case, elastic support
can do an insulating film, and the invention of the present invention according
to claim 16 can improve output sound pressure more.
piezoelectric sounding body according to claim 4 which provided the concave
which inserts the flection of the peripheral edge part of an insulating film in
a part of step part of the upper and a lower case, can improve [ accuracy ]
fixing of an insulating film reliably, and can prevent the positional
displacement by vibration, a shock, etc.
concave on the periphery of the step part of the upper and a lower case, It is
the piezoelectric sounding body according to claim 4 which inserted in and fixed
the flection formed in the peripheral edge part of an insulating film to this
concave, and accuracy can improve fixing of an insulating film reliably and it
can prevent the positional displacement by vibration, a shock, etc.
piezoelectric sounding body according to claim 4 which carried out chamfering
work of the inner peripheral surface of the step part of the upper and a lower
case, can prevent inhibition of vibration by contact with the corner of this
step part, and an insulating film, and can acquire the outstanding acoustic
feature with little variation.
piezoelectric sounding body according to claim 4 which constituted narrowly the

width at one tip of the step parts of the upper and a lower case, Since the
variation in the overlapping area of a mutual step part can be reduced and the
variation in the fixing area of an insulating film or a backing pressure
decreases, the outstanding acoustic feature with little variation can be
acquired.
piezoelectric sounding body according to claim 4 which provided the elastic
layer to the peripheral edge part of the insulating film held by the step part
of the upper and a lower case, Distortion and size dispersion of the step part
of aforementioned the upper and lower case can be absorbed, and an insulating
film can be held stably, and an unnecessary air leak can be reduced to the
aforementioned holding part, and an acoustic feature is made still more nearly
satisfactorily.
piezoelectric sounding body according to claim 5 considered as the composition
to which the electric conduction pattern and terminal of the insulating film
were made to weld by pressure with an elastic body, and even if the size
dispersion at the time of distortion and the assembly of the upper and a lower
case occurs, it can obtain electric mechanical connections stable with this
elastic body.
bend which had elasticity in some terminals, It is the piezoelectric sounding
body according to claim 5 which contacted this bend to the electric conduction
pattern of the insulating film, and connected, and a terminal, the electric
conduction pattern of an insulating film, and the stable contact pressure can be
maintained, and high-reliability can be acquired.
piezoelectric sounding body according to claim 5 which made the terminal unite
with either one of the upper and a lower case by insert molding, A terminal is
incorporated simultaneously with molding of a case, simplification of an
assembly can be attained, and since an unnecessary gap is not produced in the
holding part of a case and a terminal, the stable acoustic feature with little
variation can be acquired.
[0032]The invention of the present invention according to claim 25 separates the
end of a terminal into three pieces, and makes the piece of a center or both
ends curved pieces, It is the piezoelectric sounding body according to claim 5
considered as the composition which carries out pressure welding pinching of the
extension of an insulating film among the remaining Kata, and a terminal can be
reliably connected to the electric conduction pattern of an insulating film, and
it becomes what has high reliability.
[0033]The invention of the present invention according to claim 26 pulls out the
other end of a terminal to a way outside the upper and a lower case, It is the
piezoelectric sounding body according to claim 5 which turned up the point to
the inner diameter side of the upper and a lower case, and was made into the
piece of elastic connection, and the point of the aforementioned terminal can be
easily mounted in a circuit board by making elastic connection at a circuit
board, and the space saving of a circuit board becomes still more possible.
[0034]It is the piezoelectric sounding body according to claim 5 considered as
the composition which the invention of the present invention according to claim
27 provided [ composition ] the projected part for some terminals, and made the
projected part weld by pressure to the electric conduction pattern of an
insulating film, Since contact pressure can be made high since the electric
conduction pattern of an insulating film is contacted by the aforementioned
projected part, and the variation in a touch area can be reduced, reliable
connection can be obtained.
piezoelectric sounding body according to claim 13 which connected the electrode
of the side which is not joined to the insulating film of a piezoelectric
ceramic plate, and either of every two electric conduction patterns formed in
both sides of an insulating film by the conductor, By connecting via the
aforementioned conductor, the load of the vibration suppression by the direct
continuation of the aforementioned external terminal and a piezoelectric ceramic
plate can be reduced, and output sound pressure can be improved.

piezoelectric sounding body according to claim 13 which connected the same
polarity of every two electric conduction patterns of both sides of an
insulating film in the through hole, Since connection of the mutual electrode of
the piezoelectric ceramic plate of two sheets joined by both sides of the
insulating film can be easily made via an insulating film, and an electrical
signal can be simultaneously input into the piezoelectric ceramic plate of both
sides of an insulating film and a gap does not occur, an acoustic feature is
good.
piezoelectric sounding body according to claim 14 which provided the drawer part
which pulls out the extension of an insulating film to a part of peripheral edge
part of the upper and a lower case, The variation which the extension of an
insulating film can pull out with accuracy sufficient to a position by the
aforementioned drawer part, and it is assembling becomes what was excellent in
productivity few.
piezoelectric sounding body according to claim 30 which included the acoustic
resistance material which has micropore in the drawer part of the upper and a
lower case, is serving as the aforementioned drawer part with the inclusion part
of acoustic resistance material, and becomes what was excellent in productivity.
projection in the drawer part provided to the peripheral edge part of the upper
and a lower case, It is the piezoelectric sounding body according to claim 30
which inserted the extension of an insulating film, and some terminals in this
projection, and electrically connected the electric conduction pattern and
terminal of the insulating film, and positioning of an insulating film and a
terminal is easy at the aforementioned projection at the time of an assembly,
there is no positional displacement, and workability will become good.
[0040]Hereinafter, it describes about an embodiment of the invention using
Fig.20 from Fig.1.
[0041](Embodiment 1) Fig.1 is an exploded perspective view of the piezoelectric
sounding body in the embodiment 1 of the present invention, Fig.2 is the cross
sectional view and Fig.3 is an essential part expanded sectional view showing
the holding structure of the aforementioned insulating film and a case. Fig.4 is
an appearance perspective view showing an insulating film, and Fig.5 is the
essential part expanded sectional view, the essential part expanded sectional
view in which Fig.6 shows the fitting structure of a case, a terminal, and an
insulating film, and the frequency characteristic figure of the distortion rate
according [ Fig.7 ] to the embodiment 1 of a conventional case and the present
invention of the aforementioned insulating film.
[0042]In Fig.1 - Fig.6, 1 is the lower case formed with insulating materials,
such as a synthetic resin, and 5 is an upper case in which the leakage hole 6
was formed. The sound hole 2 is provided in the central part of the
aforementioned lower case 1, and the acoustic resistance material 14 formed from
the nylon mesh is stuck so that the sound hole 2 of the aforementioned lower
case 1 may be covered. The drawer part 3 is formed in this lower case 1 at a
periphery, and two projections 4a and 4b are formed on this drawer part 3.
[0043]7 is an insulating film and it forms it from outstanding polyethylene
terephthalate resin of elasticity, weatherability, and chemical resistance,
etc., The through-holes 8a and 8b are provided so that the projections 4a and 4b
of the aforementioned lower case may penetrate, and it has formed so that the
extension 7a stored by the drawer part 3 of the aforementioned lower case 1 may
project to a way outside the peripheral edge part of the aforementioned
insulating film 7.
[0044]The piezoelectric ceramic plates 10a and 10b which formed the electric
conduction patterns 9a and 9b in both sides of this insulating film 7, and
formed the electrodes 10c and 10d in both sides at that upper surface are stuck.
It has colored by the color discriminable from the aforementioned insulating
film 7, and these piezoelectric ceramic plates 10a and 10b have workability and
the operation which assembles and makes accuracy good that it is easy to detect
a position shift in the lamination of the aforementioned insulating film 7 and
the piezoelectric ceramic plates 10a and 10b, and conducting positioning.
[0045]10 d of electrodes of the lower surface of the aforementioned

piezoelectric ceramic plates 10a and 10b are connected with the electric
conduction pattern 9a of the aforementioned insulating film 7, and the electrode
10c of the upper surface of the aforementioned piezoelectric ceramic plates 10a
and 10b and the electric conduction pattern 9b by the conductor 11 formed with
conductive resin, respectively.
[0046]The aforementioned electric conduction patterns 9a and 9b are formed by
applying to polyester resin and an epoxy resin with high flexibility the
conductive paste which mixes electric conduction particles, such as silver and
carbon, by screen printing, and heat-hardening to them, The electric conduction
patterns 9a and 9b of the same polarity formed in the surface and rear surface
of the insulating film 7 are connected by the through hole 19.
[0047]12a and 12b are the terminals formed by phosphor bronze, and the through-
holes 13a and 13b which the projections 4a and 4b of the aforementioned lower
case 1 penetrate are provided, It puts on the electric conduction patterns 9a
and 9b of the aforementioned insulating film 7, welds by pressure between the
lower case 1 and the upper case 5, and is electrically connected with the
aforementioned electric conduction patterns 9a and 9b.
[0048]The step part 16 and the step part 18 which formed the chamfer 17 in the
corner are formed in the lower case 1 and the upper case 5 as shown in Fig.3,
One side has combined the point 15 of the protruded piece which formed width
widely, fastened the peripheral edge part of the aforementioned insulating film
7, and was formed in the lower case 1 from another side by carrying out thermal
caulking among these step parts 16 and 18.
[0049]The piezoelectric sounding body constituted as mentioned above has pulled
out the other end of the terminals 12a and 12b to the way outside the lower case
1 and the upper case 5, The point is turned up to the inner diameter side of the
aforementioned lower case 1 and the upper case 5, the pieces 12c and 12d of
elastic connection are constituted, the circuit board of apparatus is contacted,
and predetermined alternating current voltage is applied. Thereby, the
piezoelectric ceramic plate 10 carries out elastic movement, it can pronounce by
vibrating with the insulating film 7, high order resonance can be inhibited, and
the piezoelectric sounding body which excelled [ rate / of low distortion ] in
the acoustic feature can be obtained.
[0050]The frequency characteristic of the distortion rate of the embodiment 1 of
the present invention and a conventional case is shown in Fig.7.
[0051]The characteristic A of the piezoelectric sounding body of this embodiment
had a low harmonic distortion compared with the characteristic B in a
conventional case, and was able to obtain the high-quality sound reproduced
sound.
[0052]Although the example which constituted the insulating film 7 from a PET
above was described, in addition, the color scheme from which plastic material,
such as PEN, PPS, and PC, is feasible similarly, and it differs for
identification of the piezoelectric ceramic plates 10a and 10b and the
insulating film 7 -- the -- only a part is good and it may display it as a sign.
[0053]Other plastic material, such as an epoxy resin, is feasible also about
conductive resin.
[0054]Metallic materials, such as beryllium copper and nickel silver, are also
feasible also about the terminals 12a and 12b.
[0055]Plastic material, such as PBT, PC, and PPS, is also possible also about
the upper and the lower cases 1 and 5.
[0056]Also about the acoustic resistance material 14, even if it replaces with
polyester, a nonwoven fabric, etc., it is feasible.
[0057](Embodiment 2) Fig.8 is a cross sectional view of the embodiment 2 of the
present invention.
[0058]Fundamental composition is the same as embodiment 1, and it describes it
only about a point different here.
[0059]The piezoelectric ceramic plate 10 is pasted together to the upper surface
of the insulating film 7 in Fig.8, the thin hard layer 21 which comprises
stainless steel, brass, alumina, etc. is formed in a lower surface, and it holds
between the lower case 1 and the upper case 5, and constitutes the piezoelectric
sounding body.
[0060]The piezoelectric sounding body constituted as mentioned above has the
operation which can obtain the predetermined rigidity of the insulating film 7

and improves a frequency characteristic by providing the hard layer 21.
[0061]By providing the hard layer 21 small from the diameter of the insulating
film 7, high order resonance can be made hard to generate and a high-quality
sound reproduced sound can be obtained by low distortion.
[0062](Embodiment 3) Fig.9 is an exploded perspective view showing the holding
structure of the insulating film 7 of the embodiment 3 of the present invention,
and the lower case 1.
[0064]In Fig.9, 1 is a lower case, and the concave part 23 is provided to that
peripheral wall, the projected part 22 formed in the peripheral edge part of the
insulating film 7 so that it might project to the method of outside is provided,
and this projected part 22 is inserted in the concave part 23, and is held. By
holding the projected part 22 of the peripheral edge part of the aforementioned
insulating film 7, the piezoelectric sounding body constituted as mentioned
above can perform elastic support, can reduce the vibration suppression in a
supporting part, and can improve output sound pressure. Leakage of unnecessary
air can be prevented by filling up the gap of this holding part with silicone
resin, and the variation in sound pressure properties can be reduced.
[0065](Embodiment 4) Fig.10 is a fragmentary sectional view showing the bond
part of the upper and the lower case of the embodiment 4 of the present
invention.
[0067]In Fig.10, 24 is the coupling member formed in horseshoe-shaped [ which
consists of construction material with elasticity, such as nickel silver and
phosphor bronze, ], and has the operation that the interposing and fixing of the
lower case 1 and the upper case 5 can be carried out by the elasticity.
[0068]Since aforementioned the upper and lower cases 1 and 5 can be fixed
easily, without using adhesives and workability does not use adhesives well, the
piezoelectric sounding body constituted as mentioned above can save cure time,
it can reduce a production man hour, and can obtain a low cost piezoelectric
sounding body.
[0069](Embodiment 5) Fig.11 is a fragmentary sectional view showing the bond
invention.
[0071]In Fig.11, 25 is the fitting projected part provided to the point of the
peripheral wall of the lower case 1. 26 is the fitting concave portion provided
to the outer peripheral part of the upper case 5, and the upper and the lower
cases 1 and 5 have the operation that it can fix, by fitting in with the
aforementioned fitting projected part 25.
[0072]Other parts and materials for joining together of the piezoelectric
sounding body constituted as mentioned above are unnecessary, workability is
good and its productivity is good.
[0073](Embodiment 6) Fig.12 is a fragmentary sectional view showing the holding
part of the upper and the lower case of the piezoelectric sounding body of the
embodiment 6 of the present invention, and an insulating film.
[0075]In Fig.12, 27 is the welding which joined the step part 16 of this lower
case 1, and the outer edge section of the insulating film 7 in hot welding.
First, the step part 16 of the lower case 1 is abutted in the periphery of the
insulating film 7, from the periphery upper surface of the aforementioned
insulating film 7, a heating jig or an ultrasonic welding horn is hit, and the
insulating film 7 is fixed to the lower case 1. Subsequently, the upper case 5
is fitted in, and thermal caulking of the point 15 is carried out, and it joins
together.
[0076]It has the operation which the accuracy of a fixed position is good and
can reduce the variation in sound pressure by the above-mentioned composition,
Since the insulating film 7 is fixed to the lower case 1 by welding, the
insulating film 7 does not deviate temporally by vibration, and it can obtain a
reliable piezoelectric sounding body, Since adhesives are not used for fixing of

the insulating film 7 and cure time can be saved, a production man hour can also
be reduced, and a low cost piezoelectric sounding body can be obtained.
invention, and an insulating film.
[0079]In Fig.13, 28 is the flection provided to the outer edge section of the
insulating film 7, has the operation that holding which had elasticity between
the step part 16 of the lower case 1 and the step part 18 of the upper case 5
can be performed, and, thereby, can improve output sound pressure.
[0080]Since the flection 28 of the insulating film 7 has elasticity, holding
stable even if the dimension which holds the insulating film 7 according to the
curvature of the step part 16 of the upper case 5 and the lower case 1 or
deformation varied can be performed, and the variation in sound pressure
properties can be inhibited.
[0081](Embodiment 8) Fig.14 is a fragmentary sectional view showing the fixed
portion of the upper and the lower case of the embodiment 8 of the present
[0083]In Fig.14, 29 is the flection formed in the outer edge section of the
insulating film 7, is inserted in the concave 30 provided to the step part 16 of
the lower case 1, and is fixing the insulating film 7 with the upper case 5.
[0084]By this, by the flection 29 of the insulating film 7, and the concave 30
of the lower case 1, the insulating film 7 can hold with accuracy sufficient to
the position of the step part 16 of the lower case 1 reliably, and vibrates, The
positional displacement by a shock etc. can be prevented and a piezoelectric
sounding body with little aging of sound pressure properties can be obtained.
[0085](Embodiment 9) Fig.15 is a fragmentary sectional view showing the fixed
portion of the upper and the lower case of the embodiment 9 of the present
[0087]In Fig.15, 32 is the concave provided on the periphery of the step part 16
of the lower case 1, inserts in the flection 31 provided to the outer edge
section of the insulating film 7, and has composition fixed with the upper case
3.
[0088]By this, by the flection 31 of the insulating film 7, and the concave 32
of a lower case, the insulating film 7 can hold with accuracy sufficient to the
position of the step part 16 of the lower case 1 reliably, and vibrates, The
positional displacement by a shock etc. can be prevented and a piezoelectric
sounding body with little aging of sound pressure properties can be obtained.
[0089](Embodiment 10) Fig.16 is an appearance perspective view of the vibration
element portion which comprises the insulating film and piezoelectric ceramic
plate of embodiment 10 of the present invention.
[0091]In Fig.16, 33 is the elastic layer which formed elastic bodies, such as
silicone resin, in the peripheral edge part of the insulating film 7 by methods,
such as screen printing, at uniform thickness. This elastic layer 33 is put with
the level differences 16 and 18 of the upper and the lower cases 1 and 5, and
the insulating film 7 is held between the lower case 1 and the upper case 5.
[0092]Since this absorbs the curvature of the step parts 16 and 18 of the upper
and the lower cases 1 and 5, and distortion with the elasticity which the
elastic layer 33 has and holding with elasticity for the insulating film 7 can
be reliably carried out without a gap, sound pressure can obtain a piezoelectric
sounding body with little [ high again ] variation.
[0093](Embodiment 11) Fig.17 is a fragmentary sectional view showing the
terminal holding part of the embodiment 11 of the present invention.
[0095]In Fig.17, 34 is an elastic body formed with a spring material with little
permanent deformation, such as rubber, silicone rubber, and foaming

polyurethane.
[0096]The terminals 12a and 12b compress the aforementioned elastic body 34
between the lower case 1 and the upper case 5, and the projected part 20 formed
in the terminals 12a and 12b is welding them by pressure to the electric
conduction patterns 9a and 9b of the insulating film 7.
[0097]Thereby, even if the size dispersion at the time of distortion and the
assembly of the lower case 1 and the upper case 5 occurs, electric mechanical
connections stable with this elastic body 34 can be obtained.
[0098](Embodiment 12) Fig.18 is a fragmentary perspective view showing the
connection part of the terminal in the embodiment 12 of the present invention,
and an insulating film.
[0100]In Fig.18, 35a, 35b, and 35c divide the point of the terminal 12a into
35a, 35b, and 35c3 pieces, and in the three aforementioned pieces, central 35c
forms the bend 35d, and is giving elasticity.
[0101]By three pieces of this terminal, can connect the terminals 12a and 12b to
the electric conduction patterns 9a and 9b of the insulating film 7 reliably,
and it becomes what has high reliability, The electrical link of the terminals
12a and 12b and the electric conduction patterns 9a and 9b of the insulating
film 7 can be performed easily, a production man hour can be reduced, and a low
cost piezoelectric sounding body can be obtained.
part of the terminal of the piezoelectric sounding body in the embodiment 13 of
the present invention.
[0104]In Fig.19, the lower case 1 and the terminals 12a and 12b are integrally
fixed by insert molding, in these insert sections, form the bending part 36 in
the terminal 12a and the terminal 12b, and make retention strength the still
stronger thing. And the exposed surface 37 exposed from insert sections is
constituted so that it may become the surface of the lower case 1, and the same
surface, and it connects with the electric conduction patterns 9a and 9b of the
insulating film 7, and it may conduct it electrically.
[0105]This incorporates the terminals 12a and 12b simultaneously with molding of
the lower case 1, simplification of an assembly can be attained, and since an
unnecessary gap is not produced in the holding part of the lower case 1 and the
terminals 12a and 12b, the stable acoustic feature with little variation can be
acquired.
[0106](Embodiment 14) Fig.20 is an exploded perspective view of the
piezoelectric sounding body in the embodiment 14 of the present invention.
[0108]In Fig.20, 38 is a notch section, is arranged above the drawer part 3 of
the lower case 1, and equips with the acoustic resistance material of 39. The
aforementioned acoustic resistance material 39 is formed by a porous body with
air permeability, such as foaming polyurethane, and has micropore, By adjusting
the air permeability to the method of the outside of a case for the flow of the
air which occurs when the insulating film 7 vibrates via the acoustic resistance
material 39, vibration of the insulating film 7 can be controlled and sound
pressure properties can be adjusted.
[0109]This notch section 38 is not restrained in the upper part which engages
with the drawer part 3, and has the operation that sound pressure properties can
be adjusted in any position of the side wall of the upper case 5 as well as the
above.
[0110]
[Effect of the Invention]An upper case with the sound hole which the
piezoelectric sounding body of the present invention has a concave part on the
lower surface, and follows this concave part as mentioned above, By becoming the
upper surface from a lower case with a concave part, and the insulating film
which joined the piezoelectric ceramic plate which has an electrode to both
sides to at least one side, and having composition which carried out fixed
holding of the peripheral edge part of this insulating film between the above-
mentioned the upper and lower case, Unnecessary high order resonance can be

inhibited and the acoustic feature which reduced the distortion rate and was
excellent can be acquired.
Next
Representative drawing 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21
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CLAIMS
TECHNICAL FIELD
PRIOR ART
TECHNICAL PROBLEM
MEANS
OPERATION
EXAMPLE
DRAWINGS
* NOTICES *
[0001]
[Industrial Application]Using a piezoelectric transducer, this invention
generates vibration of a low frequency wave, and relates to the piezoelectric
vibration equipment used as an informing device of portable communication device
machines, such as a mobile phone and a pager.
[0002]
[Description of the Prior Art]Conventional piezoelectric vibration equipment

connected the relay component to one surface of this piezoelectric device using
the piezoelectric device of a lamination type, and was this thing that relay-
part-material-**, connects with a diaphragm, and generates vibration as it
disclosed, for example in JP,H4-292025,A. And this piezoelectric device was
vibrated on frequency lower than a audio range, vibration was transmited to the
diaphragm via the relay component, and it has reported to the user.
[0003]
[Problem to be solved by the invention]the above -- in the case of a Prior art,
since the laminated type piezoelectric device is used, structure becomes
complicated, and it cannot thin. A relay component is connected to one surface
of a piezoelectric device, vibration is transmited to the diaphragm, and
vibration cannot be transmitted outside efficiently.
[0004]this invention is the above -- it accomplished in view of the Prior art,
and it is easy composition, thinning is easy, a strong vibration is obtained,
and the transmission efficiency of vibration is also aimed at providing good
piezoelectric vibration equipment.
[0005]
[Means for solving problem]Piezoelectric vibration equipment which is
characterized by that the present invention comprises the following.
A piezoelectric transducer of a bimorph element consisting of a plate-like
diaphragm and a piezoelectric body stuck on the surface, or a uni-morph element.
Resin or the metal cases where this piezoelectric transducer was stored.
Vibration transmitting members, such as a support or a housing which one end
connected with this piezoelectric transducer, was attached, and the other end
connected to the above-mentioned case.
The above-mentioned vibration transmitting member holds the peripheral edge part
of the above-mentioned piezoelectric transducer, and an end is a housing
connected to the above-mentioned case. The oscillating gradual-decrease
component which consists of elastic members, such as weights, such as resin and
metal, or a metallic spring, is attached to the above-mentioned piezoelectric
transducer.
[0006]This invention is the piezoelectric vibration equipment which provided the
above-mentioned vibration transmitting member in the central part of the above-
mentioned piezoelectric transducer, and attached to the peripheral edge part of
the above-mentioned piezoelectric transducer the housing which served as weight.
The central part of the above-mentioned piezoelectric transducer is pinched with
a support, an elastic member and a support, the support or the elastic member,
and the elastic member.
[0007]
[Function]Since vibration is made to be transmited to a diaphragm at the
piezoelectric transducer in which the piezoelectric body was stuck by the case
via a support, a housing, or an elastic member, as for the piezoelectric
vibration equipment of this invention, vibration of a piezoelectric transducer
is transmited to a case efficiently and reliably. While vibration of a
piezoelectric transducer is converted to vibration of a desired low frequency
wave, amplitude is increased by an elastic member and the oscillating gradual-
decrease component which consists of weight, and a stronger vibration is
transmited to a case.
[0008]
[Working example]Based on Drawings, it describes about the working example of
this invention below. Fig.1 - Fig.7 show the first working example of this
invention, and the piezoelectric vibration equipment 10 of this working example
is provided with the piezoelectric transducer 15 which is a bimorph element by
which the piezoelectric bodies 14, such as electrostrictive ceramics, were stuck
on the surface and rear surface of the metal diaphragms 12 as shown in Fig.1. In
the surface of the outside of each piezoelectric body 14, the electrode was
formed and, as for the electrode of another side, the diaphragm 12 serves as
while not illustrating. The housing 16 made of resin is provided over the whole
circumference by the peripheral edge part of the piezoelectric transducer 15,
and this housing 16 is fixed to the case 18.
[0009]As shown in this piezoelectric vibration equipment at Fig.2, insulators,
such as resin, or the weight 20 which consists of a sheet metal is fixed to the
central part of the piezoelectric transducer 15 by adhesives, such as an epoxy
resin. This weight 20 amplifies the amplitude of vibration while decreasing

gradually the vibration frequency in the simple substance of the piezoelectric
transducer 15 to the low frequency wave of a request lower than a audio range,
for example, 100-200 Hz. This weight 20 may be directly fixed to the
piezoelectric body 14 of the piezoelectric transducer 15 via the spacers 22,
such as resin, as shown in Fig.3. As shown in Fig.4, the weight 20 may be
attached to the piezoelectric body 14 of both sides of the piezoelectric
transducer 15 via the spacer 22. As shown in Fig.5, without passing the spacer
22, the weight 20 may be directly fixed to the piezoelectric body 14 of both
sides of the piezoelectric transducer 15, and as shown in Fig.6 and Fig.7, the
spacer 22 and the weights 20, such as resin formed integrally, may be fixed to
both sides or one side of the piezoelectric transducer 15.
[0010]While supporting the piezoelectric transducer 15 which consists of a
bimorph element with the support member 16 according to the piezoelectric
vibration equipment of this working example, Since the weight 20 was attached to
the central part of the piezoelectric transducer 15, vibration of the
piezoelectric transducer 15 is transmited directly efficiently in the case 18,
and it can be made a moreover very thin structure. While dropping vibration
frequency on desired frequency easily by having attached weight to the central
part of the piezoelectric transducer 15, amplitude can be increased and
vibration can be reliably transmited to a user by strong vibration. As shown in
Fig.5, it can further thin by fixing the weight 20 to the piezoelectric
transducer 15 directly.
[0011]It describes based on Fig.8 and Fig.9 about the piezoelectric vibration
equipment of the second working example of this following invention. The
component same here as an above-mentioned working example attaches identical
codes, and omits a description. The piezoelectric vibration equipment of this
working example connects the supports 24, such as resin in which the end was
supported by the case 18, to the central part of the piezoelectric transducer
15. The piezoelectric vibration equipment 10 shown in Fig.8 connects the support
24 to both sides of the piezoelectric transducer 15, and the other end of the
support 24 is a thing connected to the case 18 respectively. And it is in the
state where the housing 16 of the peripheral edge part of the piezoelectric
transducer 15 was attached to the diaphragm 12, and it is placed in midair and
is performing frequency gradual decrease and an amplitude increase function as
the weight 20. What is shown in Fig.9 provided the support 24 to one
piezoelectric transducer 15 side, and the housing 16 has connected it to the
case 18 by the another side side.
[0012]Since the piezoelectric vibration equipment of this working example
attached the support 24 to the central part of the piezoelectric transducer 15,
vibration is transmited with each reliably sufficient efficiency to the case 18.
As shown in Fig.8, both sides of the case 18 can be vibrated in a similar manner
by pinching and holding the piezoelectric transducer 15 with the support 24. As
shown in Fig.9, one side of the case 18 can be effectively vibrated by attaching
the support 24 to one side of the piezoelectric transducer 15.
[0013]It describes based on Fig.10, Fig.11, and Fig.12 about the piezoelectric
vibration equipment of the third working example of this following invention.
The component same here as an above-mentioned working example attaches identical
working example is supported with the metallic springs 26, such as metal flat
springs and a coil spring, by using the central part of the piezoelectric
transducer 15 as an elastic member, as shown in Fig.10. The other end of the
metallic spring 26 was connected to the case 18, and the housing 16 provided by
the peripheral edge part of the piezoelectric transducer 15 is connected to the
near case 18 of another side as a support member. As shown in Fig.11, the
piezoelectric transducer 15 may be pinched in the case 18 with the supports 24,
such as resin in which the end was supported, and the metallic spring 26, it may
hold in it, and the housing 16 functions on it as the weight 20 in this case. As
shown in Fig.12, the piezoelectric transducer 15 may be pinched with the pair of
metallic spring 26, and may be held. Also in this case, the housing 16 is
functioning as the weight 20.
[0014]Since the piezoelectric vibration equipment of this working example
attached the metallic spring 26 to the central part of the piezoelectric
transducer 15, while vibration is decreased gradually efficiently, amplitude
increases effectively and a strong, directly efficient vibration is transmited

to the case 18. By attaching the metallic spring 26 to one side of the
piezoelectric transducer 15, as shown in Fig.10, one side of the case 18 --
effective -- oscillating **** -- as things are made and it is shown in Fig.11,
vibration of the direction connected to the metallic spring 26 of the case 18
can be lessened by holding one piezoelectric transducer 15 side with the support
24, and supporting another side with the metallic spring 26. As shown in Fig.12,
when both sides are supported with the metallic spring 26, both sides can be
vibrated similarly.
equipment of the fourth working example of this following invention. The
working example supports one central part side of the piezoelectric transducer
15, makes the piezoelectric transducer 15 be placed in midair, and operates the
housing 16 as the weight 20. What is shown in Fig.13 supports the piezoelectric
transducer 15 with the support 24 as a support member and a vibration
transmitting member. What is shown in Fig.14 supports the piezoelectric
transducer 15 with the metallic springs 26, such as metal flat springs and a
coil spring, as a support member, a vibration transmitting member, and an
elastic member.
[0016]Since the end connected the support 24 or the metallic spring 26 connected
to the case 18 to the central part of the piezoelectric transducer 15, vibration
is efficient and, as for the piezoelectric vibration equipment of this working
example, vibration is transmited to the case 18. The housing 16 of the
peripheral edge part of the piezoelectric transducer 15 functions as the weight
20, while decreasing vibration of the piezoelectric transducer 15 gradually
efficiently, amplitude is increased, and vibration is directly transmited to the
case 18 efficiently. As shown in Fig.13, the near case 18 which the other end of
the support 24 connected can be efficiently vibrated by connecting the support
24 to the central part of the piezoelectric transducer 15. As shown in Fig.14,
the direction connected to the metallic spring 26 of the case 18 can be
comparatively vibrated with big amplitude by a low frequency wave by supporting
the support 24 only with the metallic spring 26.
equipment of the fifth working example of this following invention. The
working example supports one near central part of the piezoelectric transducer
15 with the support 24 or the metallic spring 26, and supports the another side
side of the piezoelectric transducer 15 with the metallic springs 30, such as
the backing plate 28 fixed to the housing 16 and a flat spring connected to this
backing plate 28, and a coil spring. And the other end of the metallic spring 30
is connected to the case 18. What is shown in Fig.15 supports the central part
of the piezoelectric transducer 15 with the support 24. What is shown in Fig.16
supports the central part of the piezoelectric transducer 15 with the metallic
spring 26.
[0018]With the piezoelectric vibration equipment of this working example as well
as the third working example of the above, vibration can be effectively
transmited to the case 18.
[0019]It describes based on Fig.17 about the piezoelectric vibration equipment
of the sixth working example of this following invention. The component same
here as an above-mentioned working example attaches identical codes, and omits a
description. The piezoelectric vibration equipment of this working example forms
the diaphragm 32 of the piezoelectric transducer 15 by insulating resin etc. And
the metallic foil 34 is stuck on both sides of the diaphragm 32. And the
piezoelectric vibration equipment of this working example can also be used for
the piezoelectric vibration equipment of the above-mentioned first thru/or the
fifth working example.
[0020]Since the piezoelectric vibration equipment of this working example forms
the diaphragm 32 with resin, it can obtain big amplitude on lower frequency. The
diaphragm 32 can also be integrally formed with the housing 16, and insert
molding of the metallic foil 34 can also be carried out in that case.
[0021]It describes based on Fig.18, Fig.19, and Fig.20 about the piezoelectric
vibration equipment of the seventh working example of this following invention.

The component same here as an above-mentioned working example attaches identical
working example attaches the weight 20 to the housing 16 of the piezoelectric
transducer 15 integrally further. And the piezoelectric vibration equipment of
this working example can also be used for the piezoelectric vibration equipment
of the above-mentioned first thru/or the fifth working example.
[0022]The piezoelectric vibration equipment of this working example can form the
weight 20 integrally with the housing 16, and can form it also by methods, such
as 2-color molding.
[0023]A uni-morph element may be sufficient as the piezoelectric transducer of
the piezoelectric vibration equipment of this invention, and it should just make
a piezoelectric device produce surface vibration. The elastic member of the
piezoelectric vibration equipment of this invention is a thing that it may be a
coil spring by metal resin, product made of resin, or metal besides a metallic
spring, and other springs or hard rubber of form should just be the elastic
members which cannot absorb vibration easily. The support itself may function as
an elastic member slightly. And the construction material of a support may also
be ceramics and metal besides resin.
[0024]
[Effect of the Invention]The piezoelectric vibration equipment of this invention
can transmit vibration of a piezoelectric transducer to a case efficiently, and,
moreover, the strong vibration also with large amplitude is obtained. Therefore,
a user can detect a signal by vibration reliably.
Next
Representative drawing 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
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CLAIMS
TECHNICAL FIELD
PRIOR ART
TECHNICAL PROBLEM
MEANS

DRAWINGS
WRITTEN AMENDMENT
* NOTICES *
[0001]
The present invention At least one base film and at least one first electrode,
The film combination which comprises at least one second electrode and at least
one piezoelectric layer which has electrical activity polymer is included, The
surface of an alteration-in-percussion-sound film has the structure part
provided with various inclination about an electrical activity alteration-in-
percussion-sound film, and the code of the inclination of an alteration-in-
percussion-sound film surface changes twice at least.
[0002]
In a center, a concept of the present electrodynamic sound transducer is
connected with an electromagnetic vibration coil, when the most.
And a diaphragm which vibrates by a Lorentz force or airstream derived by
current is used.
In such a sound transducer, according to a style of operation, it converts to
movement with mechanical current, or movement of a diaphragm is converted to
current. By this structure form, a moving-coil loudspeaker or a microphone is
obtained, for example. This structure form excels [ sound level ] in the point
that natural tone reappearance is performed highly, despite today.
[0003]
However, this is suitable, although it originates in suspension of a diaphragm,
and the special electrodynamic combination with a magnet and predetermined
structural height and oscillation characteristic arise, neither of the uses, a
structure state nor a use. Many sound transducers which use the piezo-electric
effect for an alteration in percussion sound are also developed, without being
based on the combination of a diaphragm, a coil, and a magnet in the past tens
of years from this Reason. Those sound transducers have electrical activity
ceramics or a plastic, and it also realizes the direct alteration in percussion
sound by change of the macroscopic dimension of the sound transducer according
to electric field. That is, for example, change (d31 mode) of the dimension of
the length direction and change (d33 mode) of a thickness direction arise by the
application of the voltage to a piezoelectric diaphragm or film. In particular,
by the effect in d31 mode, bending of a layer arises and it can use this bending
to sound radiation effectively. With it, mechanical load produces the charge
transfer in a layer on the contrary, and this is generally applicable to sound
wave detection. Those piezoelectric acoustic transducers need only very slight
displacement. In the case of a loudspeaker, there is displacement typically at
the range of hundreds of micrometers, but to this, in the field of the use of a
microphone, displacement is slight or is in the range of several nanometers or
the number pm from several micrometers. Also in any of a loudspeaker and a
microphone, displacement is strongly dependent on frequency. In comparatively
high frequency, displacement is smaller than comparatively low frequency.
Although the film converter in which the distance to other surfaces is very
short is especially realizable according to this side condition, such a film
converter cannot be used by the present electromagnetic diaphragm-coil system
despite today.
[0004]
One embodiment about different converter geometry from usual considered is
disclosed, for example in US 4,638,207 A.
In order to manufacture a balloon-like loudspeaker, use of a piezoelectric
polymer on the basis of polyvinylidene fluoride (PVDF) is described in this

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