Optical encoder with two photosensors

Details Optical encoder with two photosensors Optical encoder with two photosensors

G - Physics

08

C

340/136.1

G08C 21/00 (2006.01)

Patent

CA 1262269

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.

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