Title:
TIMEPIECE
Document Type and Number:
WIPO Patent Application WO/2015/146865
Kind Code:
A1
Abstract:
Detection holes (305a, 304a) are provided in intermediate wheels (305, 304) composing a wheel train (302) connecting a motor rotor (303) and a pointer wheel (301) supporting a pointer and are provided so as to overlap once during a single rotation of the pointer wheel (301). The position where all the detection holes (305a, 304a) overlap is limited to the position where the paths of all the detection holes (305a, 304a) intersect. As a result, it is possible to detect the position of a pointer without providing a gear for needle position detection other than the intermediate wheels (304-306) composing the wheel train (302), reduce the planar space of the planes of rotation of the pointer wheel (301) and intermediate wheels (304-306) compared to cases in which a gear for needle position detection is used to detect the pointer position, and reduce the size of a timepiece such that highly accurately pointer position detection is possible.
Inventors:
IMAMURA KAZUYA (JP)
MARUYAMA DAISUKE (JP)
MARUYAMA DAISUKE (JP)
Application Number:
PCT/JP2015/058626
Publication Date:
October 01, 2015
Filing Date:
March 20, 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:
| JP2012145471A | 2012-08-02 | |||
| JP2009186293A | 2009-08-20 | |||
| JP2009186379A | 2009-08-20 | |||
| JP2009085687A | 2009-04-23 |
Attorney, Agent or Firm:
SAKAI, AKINORI (JP)
Akinori Sakai (JP)
Akinori Sakai (JP)
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