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:
Nov. 12, 2013
Filed:
Jan. 19, 2012
Kazuo Akaike, Sayama, JP;
Kaoru Kobayashi, Sayama, JP;
Kazuo Akaike, Sayama, JP;
Kaoru Kobayashi, Sayama, JP;
Nihon Dempa Kogyo Co., Ltd., Tokyo, JP;
Abstract
To perform, in an oscillation device compensating an output frequency based on a detection result of ambient temperature, temperature compensation of the output frequency with high accuracy. First and second quartz-crystal oscillators are structured by using a common quartz-crystal piece, and when oscillation outputs of first and second oscillation circuits respectively connected to these quartz-crystal oscillators are set to f, f, and oscillation frequencies of the first and the second oscillation circuits at a reference temperature are set to f, f, respectively, a frequency difference being a difference between a value corresponding to a difference between fand fand a value corresponding to a difference between fand fis treated as a temperature at that time. Further, based on the frequency difference, a frequency compensation value is determined through polynomial approximation.