User:MonikaSumauskaite

Contact

Monika Sumauskaite

0975660@hr.nl

Graphic Design

Project 3

Optical Mouse dissection

Optical Mouse is a fully electronic device used to control a cursor, select things, navigate and scroll through the screen of a computer. It uses LED light to illuminate the surface for the optical sensor (photocell) to scan the surface, in order to detect and register movement of your hand and transmits it to a computer.

1. Optical Mouse



2. Top and bottom cases.
3. View without top case


4. Mouse chip

1. A microswitch (button). Works as left and right mouse clicks.
2. Scroll wheel mount and button that works as wheel central click. The wheel detects rotation and works as a rotary switch (rotary encoder) to connect and disconnect electric signals.
3. USB connection — powers the mouse and sends digital signals to the computer.
4. Photocell or optical light sensor, that scans the surface and detects movement.
5. LED light, that shines on the surface, for the sensor to see it better.


5. Optical sensor and LED
6. Plastic prism and lens

The most important part of the mouse if the optical sensor – light detecting chip and the LED light. The LED light shines (brighter when moved) through the plastic prism, that directs the light to the surface of a desktop. The optical sensor then scans the surface and detects movement in X and Y axes. It takes multiple pictures one after another and determines how far the mouse was moved. The camera has a resolution of 18 × 18 pixel array of monochromatic pixels.
datasheet to a particular sensor in this mouse: [1]