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OPTICAL POSITION DETECTION OF A TIMEPIECE CROWN STEM

  • US 20160116306A1
  • Filed: 10/27/2015
  • Published: 04/28/2016
  • Est. Priority Date: 10/28/2014
  • Status: Active Grant
First Claim
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1. A method of detecting a movement of a timepiece setting stem arranged to be moved axially along and/or rotated about its longitudinal axis, the method comprising:

  • a light source illuminating a portion of the setting stem;

    an optical sensor receiving a reflected or diffracted light beam from the setting stem;

    a processor forming a first pixel pattern representative of the reflected light beam at a first time instant;

    the processor forming a second pixel pattern representative of the reflected light beam at a second, later time instant; and

    determining that the crown has been moved if the second pixel pattern is shifted with respect to the first pixel pattern.

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