Coordinate vector method for optical input device

Details Coordinate vector method for optical input device Coordinate vector method for optical input device

1989-04-25

1989-11-14

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

340710, G01V 904

Patent

active

048809675

ABSTRACT:
An optical input device based on a coordinate vector method in the illumination of a coordinate plane by a light source to generate a grid-shaped projection identical to the grid drawn on the coordinate plane is described. The projection is magnified and then transmitted to a light sensitive group of units which measure the brightness or darkness of the projection and generate an electrical signal based thereon which is furnished to a central processing unit. The central processing unit then evaluates the change in the signals transmitted to determine displacement and distance the light source is moved on the coordinate plane and to input into a computer for further control of the displacement of the computer cursor or similar device.

REFERENCES:
patent: 4260979 (1981-04-01), Smith
patent: 4390873 (1983-07-01), Kirsch
patent: 4409479 (1983-10-01), Sprague et al.
patent: 4521772 (1985-06-01), Lyon
patent: 4543571 (1985-09-01), Bilbrey et al.
patent: 4647771 (1987-03-01), Kato
patent: 4686329 (1987-08-01), Joyce
patent: 4712100 (1987-12-01), Tsunekuni et al.

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