OPTICAL POSITION DETECTION OF A TIMEPIECE CROWN STEM
First Claim
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.
1 Assignment
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Accused Products
Abstract
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 includes a light source illuminating a portion of the setting stem; a light detector receiving a reflected or diffracted light pattern from the setting stem; a processor forming a first pixel pattern representative of the reflected light pattern at a first time instant; the processor forming a second pixel pattern representative of the reflected light pattern at a second, later time instant; and determining that the setting stem has been moved, if the second pixel pattern is different or shifted with respect to the first pixel pattern.
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Citations
15 Claims
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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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A sensor arrangement for detecting a movement of a timepiece setting stem, the arrangement comprising:
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a timepiece setting stem arranged to be moved axially and/or rotated about its longitudinal axis; a light source for illuminating a portion of the setting stem; an optical sensor for receiving a reflected or diffracted light beam from the setting stem; and a processor for processing the reflected light beam, wherein the processor is configured to form a pixel pattern representative of the reflected light pattern and to compare a first pixel pattern obtained at a first time instant and a second pixel pattern obtained at a second, later time instant, and if the second pixel pattern is shifted with respect to the first pixel pattern, then the processor is arranged to determine that the setting stem has been moved. - View Dependent Claims (15)
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Specification