This lecture slide explains the various input devices used in the computer system.

1. Repair & Maintenance
D.Com II/II
Unit 8 : Input Devices
Lecture by: Er. Ashish K.C (Khatri)

2. # Input Devices:
● Devices through which we can send the data and instruction to the computer are
known as input devices.
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3. Some common input devices:
1. Keyboard:
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4. 2. Mouse:
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5. 3. Scanner:
● It is capable of entering information directly into the computer without
typing any information or data.
● It provides fast and more accurate data entry.
● It scans image and transforms the image to code used by the
computer.
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6. 4. Light Pen:
● It is a
photosensitive
pen lighting
device, capable
of sensing a
position on the
screen when its
tip touches the
screen.
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7. 5. Joystick:
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8. 6. Touch pad:
● It is a touch sensitive pad that is used as a pointing input device.
● We can point the objects on the screen and give commands to the
computer by putting our fingers on the touch pad.
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9. 7. Bar Code Reader:
● It is a device used for
reading bar coded data.
● Data coded in the forms of
small lines (bar) are known
as bar codes.
● A BCR uses laser-beam
scanning technology.
● Different bar codes having
different patterns of bars
reflect the beam in
different ways that is
sensed by a light sensitive
detector.
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10. 8. Optical Character Reader:
● It detects
alphanumeric
characters printed or
type written on
papers.
● The reading is done
by the light scanning
techniques in which
each character is
illuminated by a light
source and the
reflected images of
the characters are
analyzed in terms of
light and dark pattern
produced.
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11. 9. Optical Mark Reader:
● It is being used to
read answer sheet by
the means of light.
● The change in
amount of reflected
light is used to detect
the presence of mark.
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12. 10. Magnetic Ink Character Reader:
● It uses special ink to print
characters.
● It is widely used in banks
for processing cheque.
● Cheque numbers are
printed with the ink
containing magnetic
particle.
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13. 11. Digitizer:
● It is an input device used for converting pictures, maps and drawings
into digital form for storage in computer.
● Commonly used in computer aided design (CAD) by architects and
engineers to design cars, buildings, medical devices, robots, etc
● Used in geographica; information system (GIS) as well.
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14. 12. Microphone:
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15. 13. Track ball:
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16. End of Unit
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