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Reflective shaft angle encoder

  • US 4,952,799 A
  • Filed: 03/10/1989
  • Issued: 08/28/1990
  • Est. Priority Date: 03/10/1989
  • Status: Expired due to Term
First Claim
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1. A shaft angle encoder comprising:

  • a rotatable code wheel comprising a plurality of alternating reflective and non-reflective areas extending in a circumferential path around the wheel;

    a light emitting device elongated in a radial direction for illuminating the circumferential path;

    a plurality of photodetectors having elongated detection areas extending in a radial direction arrayed side by side on the same side of the code wheel as the light emitting device for receiving light from the light emitting device which is reflected from reflective areas on the code wheel; and

    comparator means for comparing signals from the photodetectors and producing signals indicative of code wheel rotation.

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