Optical rotary encoder employing plural photosensors disposed in

Details Optical rotary encoder employing plural photosensors disposed in Optical rotary encoder employing plural photosensors disposed in

1990-03-30

1990-12-04

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250237G, 341 13, G01D 584

Patent

active

049755692

ABSTRACT:
An optical rotary encoder includes four photosensor elements aligned in a square fashion. A first pair of diagonally aligned photosensor elements develop output signals of inverse phase with respect to each other as a slit plate rotates. The thus obtained output signals are applied to a comparator to obtain a first control signal. A second pair of diagonally aligned photosensor elements develop output signals of inverse phase with respect to each other as the slit plate rotates. The output signals from the second pair of photosensor elements are applied to another comparator to obtain a second control signal.

REFERENCES:
patent: 3310798 (1967-03-01), Wingate
patent: 3427463 (1969-02-01), Weyrauch
patent: 4152589 (1979-05-01), Mitchell
patent: 4184071 (1980-01-01), Fryer et al.
patent: 4218615 (1980-08-01), Zinn
patent: 4496835 (1985-01-01), Boella et al.

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