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:
Jul. 17, 1984
Filed:
Apr. 30, 1981
Applicant:
Inventor:
Fumio Kanno, Sayama, JP;
Assignee:
Citizen Watch Co., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G04F / ;
U.S. Cl.
CPC ...
368157 ; 368160 ; 318696 ;
Abstract
In an electronic timepiece utilizing a stepping motor, voltage induced in the electromagnetic coil of the motor due to free oscillation of a rotor thereof is detected in a plurality of successive detection periods after application of a driving force to the motor is completed, and it is determined on the basis of such induced voltage for the respective detection periods whether the rotor failed to step or not. If the stepping failure is determined in at least one detection period, a compensation pulse is fed to the stepping motor to compensate for the stepping failure of the rotor and thereafter driving energy supplied to the electromagnetic coil of the motor is increased.