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Table Of Contents  CertiGuide to A+ (Core Hardware)
 9  Chapter 0111:  Peripheral Devices
      9  VI  Mice

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Opto-Mechanical Mouse
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VII  Modems
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Optical Mouse

The optical mouse works by the same principles as a mechanical mouse, except that it uses an LED and a special mouse pad to track the movements of the mouse.

The LED shines from the bottom of the mouse and is reflected back by the pad into a photo sensor.

The mouse pad itself has a grid of horizontal and vertical lines that absorb the light when it hits them.

The alternating light and dark signals are used to track X-Y movements on the pad.

MS Intellimouse

The new IntelliMouse from Microsoft eliminates the need for special mouse pad while still being a true optical mouse. The LED and photo sensor instead use the natural variations of any surface to track the X-Y movements.



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