Track ball

Details Track ball Track ball

1992-09-09

1993-09-28

Weldon, Ulysses

Computer graphics processing and selective visual display system

Display peripheral interface input device

Cursor mark position control device

338128, 345164, G09G 302

Patent

active

052489612

ABSTRACT:
The case of a track ball structure has X-axis and Y-axis encoder shafts provided therein and X-axis and Y-axis driven rollers rotatably coupled with said shafts and provided closer to the top panel of the case than said shafts. A ball makes rotary contact with the X-axis and Y-axis driven rollers and is held to partly protrude from an opening made in the top panel of the case.

REFERENCES:
patent: 4538476 (1985-09-01), Luque
patent: 4623787 (1986-11-01), Kim
patent: 4786892 (1988-11-01), Kubo et al.
patent: 4881065 (1989-11-01), Soma et al.
patent: 4933670 (1990-06-01), Wislocki

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