Optical encoders

Details Optical encoders Optical encoders

H - Electricity

03

M

354/70

H03M 1/22 (2006.01) G01D 5/34 (2006.01) G01D 5/347 (2006.01) H03M 1/24 (2006.01)

Patent

CA 2025806

ABSTRACT OF THE DISCLOSURE Conventional optical encoders have an optically- encoded plate with parallel tracks each comprising alternate opaque and transparent regions which differ in length between the tracks. LED's direct radiation onto the upper surface of the plate and detectors located below the plate provide an output in response to radiation transmitted through the transparent regions. In the present invention, the opaque regions are reflective and the encoder includes detectors mounted above the plate with provide normally complementary outputs in response to radiation reflected from the reflective regions. A processor detects any loss of complementarity and determines the position of the plate close to the boundary between adjacent regions by comparing the detector outputs as one falls and the other rises.

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