Title:
ELECTRONIC CLOCK
Document Type and Number:
WIPO Patent Application WO/2015/141511
Kind Code:
A1
Abstract:
Provided is an electronic clock which can operate with a low power consumption and can quickly fast forward a step motor in accordance with the various environments in which the clock is placed. The present invention has a normal pulse generator circuit (5) for outputting a normal pulse (SP) for driving a step motor (30), a detection pulse generator circuit (10) for outputting detection pulses (DP1, DP2) for detecting whether the step motor (30) rotated or not after the step motor (30) was driven by means of the normal pulse (SP), a pulse selection circuit (7) for selecting and outputting the normal pulse (SP) and the detection pulses (DP1, DP2), a rotation detector circuit (40) for inputting detection signals (DS1, DS2) which are generated by means of the detection pulses (DP1, DP2) and for determining whether the step motor (30) rotated or not, and a frequency selection circuit (4) for determining the drive interval of the normal pulse (SP), wherein the rotation detector circuit (40) is configured to indicate the frequency corresponding to the generation position of the detection signals (DS1, DS2) to the frequency selection circuit (4).
Inventors:
IRI DAISUKE (JP)
TAKYO YU (JP)
TAKYO YU (JP)
Application Number:
PCT/JP2015/056854
Publication Date:
September 24, 2015
Filing Date:
March 09, 2015
Export Citation:
Assignee:
CITIZEN HOLDINGS CO LTD (JP)
CITIZEN WATCH CO LTD (JP)
CITIZEN WATCH CO LTD (JP)
International Classes:
G04C3/14
Domestic Patent References:
| WO2008004605A1 | 2008-01-10 |
Foreign References:
| JP2010243473A | 2010-10-28 | |||
| JP2011247796A | 2011-12-08 | |||
| JP2010164461A | 2010-07-29 |
Other References:
See also references of EP 3121662A4
Attorney, Agent or Firm:
HARUKA PATENT & TRADEMARK ATTORNEYS (JP)
Patent business corporation far international patent firm (JP)
Patent business corporation far international patent firm (JP)
Download PDF: