X-Y Position input device for display system

Details X-Y Position input device for display system X-Y Position input device for display system

1983-08-08

1985-12-17

Curtis, Marshall M.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

74471XY, G09G 100

Patent

active

045595321

ABSTRACT:
An X-Y input device comprises a rotatable ball, a first driven roller held in contact with the rotatable ball and rotatable in response to rotation of the rotatable ball, a second driven roller held in contact with the rotatable ball and rotatable in response to rotation of the rotatable ball, the second driven roller having an axis of rotation extending perpendicularly to that of the first driven roller, first angle detector means for detecting an angle of rotation of the first driven roller, second angle detector means for detecting an angle of rotation of the second driven roller, and a casing housing the rotatable ball, the first and second driven rollers, and the first and second angle detector means. The casing has a lower opening with the rotatable ball partly projecting downwardly therethrough for rolling movement on a base. The casing has at least one annular projection on a lower surface thereof for rejecting foreign matter.

REFERENCES:
patent: 3835464 (1974-09-01), Rider
patent: 4404865 (1983-09-01), Kim

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