The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 23, 2019
Filed:
Mar. 09, 2015
Citizen Holdings Co., Ltd., Tokyo, JP;
Citizen Watch Co., Ltd., Tokyo, JP;
Daisuke Iri, Nishitokyo, JP;
Yu Takyo, Nishitokyo, JP;
CITIZEN WATCH CO., LTD., Tokyo, JP;
Abstract
Provided is an electronic watch which achieves a highest-speed fast-forward operation of a step motor based on various environments under which the watch is placed, and enables low-power driving. The electronic watch includes: a normal pulse generator circuit configured to output a normal pulse SP for driving a step motor; a detection pulse generator circuit configured to output, after the step motor has been driven with the normal pulse SP, detection pulses DPand DPfor detecting whether or not the step motor has been rotated; a pulse selection circuit configured to selectively output the normal pulse SP and the detection pulses DPand DP; a rotation detector circuit configured to input detection signals DSand DSgenerated from the detection pulses DPand DP, and to determine whether or not the step motor has been rotated; and a frequency selection circuit configured to determine a driving interval of the normal pulse SP, in which the rotation detector circuit is configured to instruct the frequency selection circuit to select a frequency corresponding to a position at which the detection signals DSand DShave been generated.