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Optical encoder with encapsulated electrooptics

  • US 5,317,149 A
  • Filed: 11/12/1992
  • Issued: 05/31/1994
  • Est. Priority Date: 11/12/1992
  • Status: Expired due to Term
First Claim
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1. An optical encoder for sensing modulated light reflected from a movable member, the sensor comprising:

  • a light emitting device having a light output for illuminating the movable member;

    at least one photodetector for detecting the modulated light reflected from the movable member;

    a transparent medium encapsulating the light emitting device and the photodetector; and

    a lens surface on the medium in an optical path defined between the light emitting device, the movable member, and the photodetector, and wherein the width of each cycle of photodetector area is twice the width of each cycle of reflective and nonreflective areas on the movable member divided by magnification of the detector lens.

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