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Optical navigation system having a filter-window to seal an enclosure thereof

  • US 8,558,163 B2
  • Filed: 03/23/2011
  • Issued: 10/15/2013
  • Est. Priority Date: 12/16/2005
  • Status: Active Grant
First Claim
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1. An optical navigation system comprising:

  • a coherent light source to emit light to illuminate a portion of a finger;

    a window covering the light source so that light emitted from the light source is transmitted through the window to illuminate the portion of the finger; and

    a detector to receive through the window light reflected from the portion of the finger, the detector including a speckle-based sensor configured to sense movement of the finger relative to the detector based on changes in a complex interference pattern created by the light reflected from the portion of the finger.

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