Invention Grant
- Patent Title: Electronic timepiece
-
Application No.: US14915253Application Date: 2014-08-29
-
Publication No.: US09690259B2Publication Date: 2017-06-27
- Inventor: Yu Takyo , Shogo Sezaki , Toshiaki Fukushima , Daisuke Iri
- Applicant: CITIZEN HOLDINGS CO., LTD. , CITIZEN WATCH CO., LTD.
- Applicant Address: JP Tokyo
- Assignee: CITIZEN WATCH CO., LTD.
- Current Assignee: CITIZEN WATCH CO., LTD.
- Current Assignee Address: JP Tokyo
- Agency: Hubbs, Enatsky & Inoue PLLC
- Priority: JP2013-177806 20130829
- International Application: PCT/JP2014/072820 WO 20140829
- International Announcement: WO2015/030205 WO 20150305
- Main IPC: G04C3/14
- IPC: G04C3/14

Abstract:
Provided is an electronic timepiece, including: a step motor; a motor driver; a normal drive pulse generation circuit configured to output a normal drive pulse at a designated drive rank; a rotation detection pulse generation circuit configured to output a detection pulse; a rotation detection circuit which comprises at least a first detection mode determination circuit configured to conduct determination in a first detection mode and which is configured to detect rotation or non-rotation of a rotor; a rotation determination counter circuit configured to count a number of times that the rotation has been successively detected by the rotation detection circuit; a first detection mode determination counter circuit configured to count a number of times that a detection signal generated by the detection pulse becomes a predetermined detection pattern in the first detection mode; and a drive rank selection circuit configured to designate a drive rank of the normal drive pulse based on results of the counting conducted by the rotation determination counter circuit and the first detection mode determination counter circuit.
Public/Granted literature
- US20160216695A1 ELECTRONIC TIMEPIECE Public/Granted day:2016-07-28
Information query