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Optical encoder module

  • US 20050068773A1
  • Filed: 08/15/2001
  • Published: 03/31/2005
  • Est. Priority Date: 08/17/2000
  • Status: Active Grant
First Claim
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1. An optical encoder, comprising:

  • a light-emitting element;

    a transparent medium encapsulating the light-emitting element, the transparent medium having a convex aspherical external surface shaped so as to focus light received from the light-emitting element into a substantially collimated beam of light using a single refractive interface;

    a detector facing the light-emitting element to detect the collimated beam of light from the light-emitting element via the convex aspherical surface of the transparent medium;

    a movable module placed between the light-emitting element and the detector to modulate the collimated beam of light to the detector.

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