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Optical encoder with direction-dependent optical properties having an optically anisotropic region to produce a first and a second light distribution

  • US 10,145,711 B2
  • Filed: 03/03/2016
  • Issued: 12/04/2018
  • Est. Priority Date: 03/05/2015
  • Status: Active Grant
First Claim
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1. An optical encoder for an electronic device, the optical encoder comprising:

  • a spindle configured to rotate about a central axis;

    an optical emitter configured to illuminate a portion of the spindle;

    an optical detector configured to receive light from the illuminated portion of the spindle; and

    an array of contrasting regions formed on an outward-facing surface of the spindle and extending along a length of the spindle, wherein the array of contrasting regions includes a set of optically anisotropic regions interspersed with a set of optically-absorptive regions, whereinan optically anisotropic region of the set of optically anisotropic regions is configured to;

    produce a first light distribution for light that is reflected along a transverse plane that is perpendicular to the central axis of the spindle; and

    produce a second light distribution for light that is reflected along a longitudinal plane that passes through the central axis of the spindle, wherein the second light distribution is wider than the first light distribution.

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