Optical mouse uses photodiodes and LED technology
An optical mouse is an advanced computer pointing device that utilizes a light-emitting diode along with an optical sensor and digital signal processing in place of the traditional mouse ball and electromechanical transducer. The Movement is detected by sensing changes in reflected light rather than by interpreting the action of a rolling sphere.
The optical mouse takes microscopic snapshots of the working plane at a rate of more than 1,000 images per second. As the mouse is moved, the image changes simultaneously. The tiniest irregularities in the surface can fabricate images good enough for the sensor and DSP to engender usable movement data. The best surfaces reflect but scatter light as an example is a blank sheet of white drawing paper. Some surfaces do not consent to the sensor and DSP to function properly as the irregularities are too small to be detected. An example of an underprivileged optical-mouse surface is unfrosted glass.
In practice, an optical mouse does not necessitate cleaning as it has no moving parts. This all-electronic feature also eliminates mechanical fatigue and failure and if the device is used with the proper surface sensing is more accurate than is possible with any pointing device using the old electromechanical design. With the cost of computing components decreasing with time, it has turn out to be possible to pack the optical mouse with more powerful image processing chips that have many extraordinary functions.
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