Optical encoder with two photosensors

Details Optical encoder with two photosensors Optical encoder with two photosensors

1984-04-02

1987-01-06

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

340347P, G01B 1100, G01D 534

Patent

active

046348590

ABSTRACT:
An optical encoder for indicating revolutions of a shaft includes two phototransistors positioned to be energized concurrently by light from a light source, a barrier rotated by the shaft to shade the photosensors from the light source during a portion of each revolution, and a signal processing circuit which responds to outputs of the photosensors when both are illuminated to provide an unambiguous indication at the end of each revolution of the shaft. The signal processing circuit includes a latch circuit which is set in response to one photosensor, providing an output while the other photosensor is providing its output. The latch circuit is reset when the outputs from both photosensors terminate.

REFERENCES:
patent: 3222529 (1965-12-01), Askowith
patent: 3264639 (1966-08-01), Lerman et al.
patent: 3562541 (1971-02-01), Schroeder
patent: 3699560 (1972-10-01), Meunier et al.
patent: 3727057 (1973-04-01), Higby et al.
patent: 3783277 (1974-01-01), Younkin et al.
patent: 3931513 (1976-01-01), Germain
patent: 3944923 (1976-03-01), Luteran
patent: 4489384 (1984-12-01), Hurley et al.

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