Incremental optical encoder having partially opaqued quadrature

Details Incremental optical encoder having partially opaqued quadrature Incremental optical encoder having partially opaqued quadrature

1996-02-29

1998-06-09

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

25023116, 25023118, G01D 534

Patent

active

057638748

ABSTRACT:
An optical encoder having a detector device including four light detectors, each formed of an elongated light sensitive surface. Free zones of this surface alternate with zones covered by an opaque layer arranged so that the cooperation of the light detectors with an encoder disc which leads to the delivery of output signals in phase quadrature, each light detector generating an output signal of a single phase.

REFERENCES:
patent: 4451731 (1984-05-01), Leonard
patent: 4559524 (1985-12-01), Suzuki
patent: 4654524 (1987-03-01), Kita
patent: 4691101 (1987-09-01), Leonard
patent: 4945231 (1990-07-01), Ohya et al.
patent: 4998013 (1991-03-01), Epstein et al.
patent: 5254919 (1993-10-01), Bridges et al.

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