Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
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
Arreguit Javier
Bidiville Marc
Buczek Harthmuth
Bussien Aldo
Droz-Dit-Busset Fabien
Eakin James E.
Logitech Inc.
Nelms David C.
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