How Mouse Works
Roller ball mouse is used from about 1990 to 2000. You have to clean the ball every half a year or so. It gathers dust and dirt, and can get stuck. It works well on smooth flat surfaces only. It does not work well on carpet.
- Pulling the mouse turns the ball.
- X and Y rollers grip the ball and transfer movement.
- Optical encoding disks include light holes.
- Infrared LEDs shine through the disks.
- Sensors gather light pulses to convert to X and Y velocities.