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:
Jun. 12, 1984
Filed:
Jul. 01, 1982
Applicant:
Inventors:
Assignee:
Citizen Watch Company Limited, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G04B / ;
U.S. Cl.
CPC ...
368201 ; 368202 ;
Abstract
An electronic timepiece having a quartz crystal oscillator circuit as a timebase signal source is provided with a temperature compensation system to compensate timebase signal frequency deviations with temperature, all components of the system being incorporated in the timepiece IC chip. The system is based on a temperature-sensitive voltage stabilizer circuit whose output voltage is current-converted to control the frequency of a temperature-insensitive oscillator circuit. Date generated on the basis of the latter oscillator frequency is applied to compensate the timebase signal frequency, by a capacitor switching technique.