Pointing device with differential optomechanical sensing

Details Pointing device with differential optomechanical sensing Pointing device with differential optomechanical sensing

1992-08-10

1997-10-21

Au, Amelia

Computer graphics processing and selective visual display system

Display peripheral interface input device

Cursor mark position control device

345163, G09G 100

Patent

active

056801572

ABSTRACT:
A pointing device including a ball engaging one or more shaft encoders, each shaft encoder having an encoding wheel, including a monolithic photosensitive array for detecting light pulses representative of rotary movement of the ball. The photosensitive array provides a plurality of resolutions and permits accurate tracking of rotary movement of the ball without need for a mask. Comparator and latch means operate on the output of the array and provides digital hysteresis.

REFERENCES:
patent: 4404865 (1983-09-01), Kim
patent: 4712100 (1987-12-01), Tsunekuni et al.
patent: 4767923 (1988-08-01), Yuasa
patent: 5027109 (1991-06-01), Donovan et al.
patent: 5142655 (1992-08-01), Drumm
patent: 5160918 (1992-11-01), Saposnik et al.

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