Mouse mechanism diagram.svg

1. Description : Diagram of a mechanical mouse.
   
   1. Pulling the mouse turns the ball.
   2. X and Y rollers grip the ball and transfer movement.
   3. Optical encoding disks include light holes.
   4. Infrared LEDs shine through the disks.
   5. Sensors gather light pulses to convert to X and Y velocities.
   


2. Source : Here


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