Invention Grant
- Patent Title: Analog electronic watch
- Patent Title (中): 模拟电子手表
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Application No.: US12224670Application Date: 2007-03-02
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Publication No.: US07961557B2Publication Date: 2011-06-14
- Inventor: Teruhiko Fujii , Isao Kitazawa , Masaaki Namekawa , Takayuki Uchida , Takayuki Hasumi , Takuji Ike
- Applicant: Teruhiko Fujii , Isao Kitazawa , Masaaki Namekawa , Takayuki Uchida , Takayuki Hasumi , Takuji Ike
- Applicant Address: JP Tokyo
- Assignee: Citizen Holdings Co., Ltd.
- Current Assignee: Citizen Holdings Co., Ltd.
- Current Assignee Address: JP Tokyo
- Agency: Wenderoth, Lind & Ponack L.L.P.
- Priority: JP2006-057589 20060303
- International Application: PCT/JP2007/053994 WO 20070302
- International Announcement: WO2007/102412 WO 20070913
- Main IPC: G04B19/04
- IPC: G04B19/04 ; G04B19/06 ; G04B47/06

Abstract:
An analog electronic watch of the present invention includes: a display unit (2) for displaying time with a position of a hand; a stepper motor (3) for driving the hand; a motor drive unit (4) for controlling driving of the stepper motor at a predetermined hand drive cycle at normal time; hand position detection means (5) for detecting a position of the hand; a hand position detection means control unit (6) for intermittently controlling driving of the hand position detection means (5) at a first detection cycle which is longer than the hand drive cycle; and a detection cycle changing unit (7) for instructing the hand position detection means (5) to change the detection cycle. When detecting a predetermined detection cycle changing condition, the detection cycle changing unit (7) changes a cycle at which the hand position detection means (5) detects a position of the hand, from the first detection cycle to a second detection cycle, while maintaining the hand drive cycle at which the stepper motor (3) drives the hand.
Public/Granted literature
- US20090016172A1 Analog Electronic Watch Public/Granted day:2009-01-15
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