Coherent Mixing Interference Based Sensors for Characterizing Movement of a Watch Crown
First Claim
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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Abstract
An electronic watch includes 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, and a sensor. The beam of electromagnetic radiation depends on a coherent mixing of electromagnetic radiation within a resonant cavity of the electromagnetic radiation source. The coherent mixing includes 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. The sensor measures a first parameter of the beam of electromagnetic radiation and determines, using the measurement of the first parameter, a value of a second parameter characterizing movement of the watch crown. The second parameter may include a direction of rotation or speed of rotation of the watch crown, or other parameters.
28 Citations
20 Claims
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1. An electronic watch, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A watch crown sensor system, comprising:
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a first electromagnetic radiation source emitting a first beam of electromagnetic radiation; a second electromagnetic radiation source having a known position and orientation with respect to the first electromagnetic radiation source and emitting a second beam of electromagnetic radiation; and a set of one or more sensors;
wherein;each of the first beam of electromagnetic radiation and the second beam of electromagnetic radiation depends on a coherent mixing of electromagnetic radiation within a first resonant cavity of the first electromagnetic radiation source or a second resonant cavity of the second electromagnetic radiation source; the coherent mixing of electromagnetic radiation within each of the first resonant cavity and the second resonant cavity comprises a mixing of a first amount of electromagnetic radiation generated by the first electromagnetic radiation source or the second electromagnetic radiation source and a second amount of electromagnetic radiation redirected into the first resonant cavity or the second resonant cavity by a watch crown surface; and the set of one or more sensors measures a first parameter of each of the first beam of electromagnetic radiation and the second beam of electromagnetic radiation, and determines, using the measurements of the first parameter, a value of a second parameter characterizing movement of a watch crown. - View Dependent Claims (16, 17, 18, 19)
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20. A method of determining a value of a parameter characterizing movement of a watch crown, comprising:
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generating a first amount of coherent light in a resonant cavity of a laser; receiving into the resonant cavity a second amount of coherent light redirected by a watch crown surface; emitting from the resonant cavity a beam of coherent light dependent on a coherent mixing of the first amount of coherent light and the second amount of coherent light; measuring a junction voltage or a bias current of the laser, the junction voltage or the bias current dependent on the coherent mixing of the first amount of coherent light and the second amount of coherent light within the resonant cavity; and determining, from at least the measurement of the junction voltage or the bias current, the value of the parameter characterizing movement of the watch crown.
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Specification