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Tracker Ball with Surface Charge Transportation Disclosure Number: IPCOM000068809D
Original Publication Date: 1978-Feb-01
Included in the Prior Art Database: 2005-Feb-20

Publishing Venue


Related People

Holloway, BL [+details]


A tracker ball is a device which can be used instead of a joystick to move a cursor around a display screen. A user rotates the ball causing movement of the cursor in a direction corresponding to the direction of rotation of the ball. Conventionally, tracker balls have mechanical pick-offs driving shaft encoders through which motion of the tracker ball can be determined.