Title:
TIMEPIECE
Document Type and Number:
WIPO Patent Application WO/2015/151944
Kind Code:
A1
Abstract:
Based on whether or not light passes through a detection hole (305a) which is provided in a detection wheel (305) which rotates in conjunction with the rotation of a cannon pinion coupled to a motor, it is determined if the state is a bright state or a dark state each time the motor is driven by one step. A switching position (X) at which a dark state changes to a bright state is identified when a bright state determination is made after a dark state determination has been made, and the position one step after the identified switching position X is set as the reference position X+1 of the cannon pinion. As a result, after a movement is assembled, reference positions X+1 and X-1 can be set.
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Inventors:
KATO AKIRA (JP)
IMAMURA KAZUYA (JP)
MORITA SHOICHIRO (JP)
YANO YUJI (JP)
IMAMURA KAZUYA (JP)
MORITA SHOICHIRO (JP)
YANO YUJI (JP)
Application Number:
PCT/JP2015/058997
Publication Date:
October 08, 2015
Filing Date:
March 24, 2015
Export Citation:
Assignee:
CITIZEN HOLDINGS CO LTD (JP)
CITIZEN WATCH CO LTD (JP)
CITIZEN WATCH CO LTD (JP)
International Classes:
G04C3/00
Foreign References:
JP2009288139A | 2009-12-10 | |||
JP3872688B2 | 2007-01-24 | |||
JP2004226132A | 2004-08-12 | |||
JP2009085754A | 2009-04-23 |
Other References:
See also references of EP 3128378A4
Attorney, Agent or Firm:
SAKAI, AKINORI (JP)
Akinori Sakai (JP)
Akinori Sakai (JP)
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