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Optical sensing in displacement type input apparatus and methods

  • US 20080055275A1
  • Filed: 08/30/2006
  • Published: 03/06/2008
  • Est. Priority Date: 08/30/2006
  • Status: Active Grant
First Claim
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1. An apparatus, comprising:

  • an input system comprising a displaceable member movable in an operational zone and a tracking surface that moves in correlation with movement of the displaceable member;

    an optical sensor having a field of view of at least a portion of the tracking surface during movement of the displaceable member in the operational zone and being operable to generate optical data in response to light received from the tracking surface; and

    a processing system operable to produce motion measures indicative of movement of the tracking surface from the optical data.

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