ELECTRONIC CLOCK - CITIZEN HOLDINGS CO LTD

Title:

ELECTRONIC CLOCK

Document Type and Number:

WIPO Patent Application WO/2015/030205

Kind Code:

A1

Abstract:

This electronic clock includes: a step motor (8); a motor driver (7), a normal drive pulse generation circuit (3) that outputs a normal drive pulse (SP) of a designated drive rank; a rotation detection pulse generation circuit (5) that outputs a detection pulse (B5-12, F7-14, F5.5); a rotation detection circuit (9) which is at least provided with a first detection mode determination circuit (91) for making determinations in a first detection mode, and which detects the rotation/non-rotation of a rotor; a rotation determination counter circuit (11) that counts the number of times that the rotation detection circuit (9) has consecutively detected rotation; a first detection mode determination counter circuit (111) that, in the first detection mode, counts the number of times that a detection signal based on the detected pulse exhibits a prescribed detection pattern; and a drive rank selection circuit (10) that designates the drive rank of the normal drive pulse (SP) on the basis of the counting result of the rotation determination counter circuit (11) and the first detection mode determination counter circuit (111).

Inventors:

TAKYO YU (JP)
SEZAKI SHOGO (JP)
FUKUSHIMA TOSHIAKI (JP)
IRI DAISUKE (JP)

Application Number:

PCT/JP2014/072820

Publication Date:

March 05, 2015

Filing Date:

August 29, 2014

Export Citation:

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Assignee:

CITIZEN HOLDINGS CO LTD (JP)
CITIZEN WATCH CO LTD (JP)

International Classes:

G04C3/14

Domestic Patent References:

WO2011043389A1	2011-04-14
WO1995027926A1	1995-10-19

Foreign References:

JP2009288133A	2009-12-10
JPH07120567A	1995-05-12
JPH0833457B2	1996-03-29
JPH0142395B2	1989-09-12
JPH09266697A	1997-10-07

Other References: