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Coherent Mixing Interference Based Sensors for Characterizing Movement of a Watch Crown

  • US 20190317454A1
  • Filed: 04/09/2019
  • Published: 10/17/2019
  • Est. Priority Date: 04/13/2018
  • Status: Abandoned Application
First Claim
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1. An electronic watch, comprising:

  • a housing;

    a user-operable watch crown mounted to the housing;

    an electromagnetic radiation source emitting a beam of electromagnetic radiation toward a watch crown surface, the beam of electromagnetic radiation dependent on a coherent mixing of electromagnetic radiation within a resonant cavity of the electromagnetic radiation source;

    a sensor measuring a first parameter of the beam of electromagnetic radiation and determining, using the measurement of the first parameter, a value of a second parameter characterizing movement of the watch crown;

    wherein;

    the coherent mixing of electromagnetic radiation comprises a mixing of a first amount of electromagnetic radiation generated by the electromagnetic radiation source and a second amount of electromagnetic radiation redirected into the resonant cavity by the watch crown surface.

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