Title:
Optical position detection of a clock crown winding core
Document Type and Number:
Japanese Patent JP5982051
Kind Code:
B2
Abstract:
The present invention concerns a method of detecting a movement of a timepiece setting stem (1) arranged to be moved axially along and/or rotated about its longitudinal axis. The method comprises: (a) a light source (5) illuminating a portion of the setting stem (1); (b) a light detector (12) receiving a reflected or diffracted light pattern (9) from the setting stem (1); (c) a processor (13) forming a first pixel pattern representative of the reflected light pattern at a first time instant; (d) the processor (13) forming a second pixel pattern representative of the reflected light pattern at a second, later time instant; and (e) determining that the setting stem (1) has been moved, if the second pixel pattern is different or shifted with respect to the first pixel pattern.
Inventors:
Ivan Feri
Rafael Barme
Damian Schumtz
Pascal Lagorget
Rafael Barme
Damian Schumtz
Pascal Lagorget
Application Number:
JP2015199176A
Publication Date:
August 31, 2016
Filing Date:
October 07, 2015
Export Citation:
Assignee:
The Swatch Group Research and Development Limited
International Classes:
G04G21/00
Domestic Patent References:
| JP2009199786A | ||||
| JP52126774A | ||||
| JP2013134188A |
Foreign References:
| WO2001022038A1 |
Attorney, Agent or Firm:
Masaki Yamakawa
Shigeki Yamakawa
Shigeki Yamakawa
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