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light pen.ppt

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light pen.ppt

  1. 1. CONTENTS 1. Introduction 2. Light pen operation 3. Types of light pen 4. Comparison with mouse pointer 5. Advantages of light pen 6. Conclusion
  2. 2. • Light pen is a computer input device in the form of light sensitive wand used in the conjunction with the computer’s CRT monitor. • It allows the user to point to displayed objects, or draw on the screen, in a similar way to touch screen, but with greater positional accuracy.
  3. 3. What is light pen? • A input device that utilizes a light sensitive detector to select objects on display screen. • It is similar to mouse, except that with a light pen one can move the pointer or select the object on the display screen by directly pointing to the objects with the pen.
  4. 4. Light pen operation 1. Fairly simple to implement. 2. Works directly by sensing the sudden change in brightness of a point on the screen
  5. 5. When the photo cell senses the beam scanning across the face of the screen a signal is sent to the CRT controller (chip) which causes it to record the current X,Y position of the video signal that is generating. Depending on he suppostication desired the software can capture the limits of the “region” and the determines the centre of the region.
  6. 6. DIFFERENT TYPES OF LIGHT PEN-: 1. Standard touch tip, 2. Industrial touch tip, 3. Industrial armored touch tip, 4. Dual switch, 5. Side switch and 6. Terminal replacement
  7. 7. Fx-421 STP Light Pen 1. Choice for standard office & manufacturing environment. 2. Barrel composed of anodized aluminum. 3. Durable than plastic and features high impact plastic nose and optics assemblies.
  8. 8. FX -441 I.T.T Light pen 1. Ideal for medium duty office and manufacturing environments where immunity to EMI and noise is necessary. 2. Barrel composed of anodized aluminum. 3. Durable than plastic.
  9. 9. FX-451I IATP Light pen 1. Moderate duty pen ideal for public purpose and where immunity to EMF and noise is necessary. 2. Barrel composed of ind. Gray aluminum. 3. Much more durable than plastic.
  10. 10. FX-422 DS Light pen 1. Ideal for office and light manufacturing factory environments. 2. Barrel composed of anodized aluminum . 3. Much more durable than plastic.
  11. 11. Fx-439 SS Light Pen 1. Ideal for heavy duty office and manufacturing factory environment. 2. Barrel is composed of highly durable stainless steel . 3. Can be used from a distance of 12” from the screen due to telescopic optics.
  12. 12. Fx-481 TR Light Pen 1. Ideal for use in amber monitors . 2. Compatible with telex terminals. 3. Barrel is composed of gray ribbed plastic.
  13. 13. BLACK LIGHT PEN • With this pen one can write invisible messages. • These can be revealed under black light. • Can be used for making black posters.
  14. 14. ADVANTAGES-: • 3-d invisible code and patent technology. • All the products are designed as cartoon model, personality, deny identity. • A kind of click application, sound or animation will be brought out in ½ a second, the celerity is surprising.
  15. 15. DIFFERENCE • No cursor movement. • Direct point on the application. • Easy to move on the screen. • Cursor movement is required. • Indirect point on the application. • Hard to move on the screen.
  16. 16. SOME APPLICATIONS
  17. 17. Conclusion So from the underlying points we can conclude that light pens are preferred more by the users. 1. It does not require a pad thus occupies less space on the desk. 2. It is more comfortable for drawing as it is in direct contact with the screen.

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