Optical encoders using transmitted and reflected l

专利名称：Optical encoders using transmitted and

reflected light detection havingcomplementary output

发明人：Robert M. Taylor申请号：US07/584626申请日：19900919公开号：US05065013A公开日：19911112

摘要：An optical encoder has an optically-encoded plate having parallel tracks eachcomprising alternate opaque, reflective regions and transparent, non-reflective regionswhich differ in length between the tracks. LED's direct radiation onto one side of eachtrack. Detectors located on one side of the plate provide an output in response toradiation reflected from the reflective regions of each track; detectors located on theopposite side of the plate provide an output in response to radiation transmittedthrough the transparent regions. The outputs from the detectors are normallycomplementary. A processor detects any loss of complementarity and determines theposition of the plate close to the boundary between adjacent regions by comparing thedetector outputs as one falls and the other rises.

申请人：SMITHS INDUSTRIES PUBLIC LIMITED COMPANY

代理机构：Pollock, VandeSande and Priddy

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