Cursor pointing device utilizing a photodetector array with targ

Details Cursor pointing device utilizing a photodetector array with targ Cursor pointing device utilizing a photodetector array with targ

1992-10-05

1994-02-22

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

25023113, 345163, G01V 904

Patent

active

052889939

ABSTRACT:
A cursor control device for personal computers and workstations includes a randomly speckled ball illuminated with diffuse lighting. An image of at least a portion of the illuminated area of the speckled ball is focused by an optical element such as a diffractive optical element onto a photosensitive array. Logic associated with the photosensitive array determines movement of the ball across the array, and translates that movement into conventional cursor control signals supplied to a host system.

REFERENCES:
patent: 4720631 (1988-01-01), Lapeyre

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