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:
May. 27, 1980
Filed:
Apr. 20, 1978
Applicant:
Inventors:
Kazuhiro Asano, Tokyo, JP;
Makoto Ueda, Tokyo, JP;
Akira Torisawa, Tokyo, JP;
Masaharu Shida, Tokyo, JP;
Katsuhiko Satoh, Tokyo, JP;
Masaaki Mandai, Tokyo, JP;
Assignee:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G04C / ;
U.S. Cl.
CPC ...
368202 ; 368155 ;
Abstract
An electronic timepiece reduces power consumption by normally driving the stepping motor with a short pulse and driving the motor with a wide pulse under heavy load conditions by sensing the rotor position. A detection circuit senses the voltage drop across a detection element in series with the motor coil for driving a first detection pulse and senses again for driving a second detection pulse. If the second voltage drop is larger, then the rotor is not rotating whereupon the wide pulse is used to drive the motor.