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. 24, 2005
Filed:
Dec. 27, 2001
Applicants:
Tadao Mandai, Gunma, JP;
Kenji Ikeda, Gunma, JP;
Inventors:
Tadao Mandai, Gunma, JP;
Kenji Ikeda, Gunma, JP;
Assignee:
Sanyo Electric Co., Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04B003/36 ;
U.S. Cl.
CPC ...
Abstract
This invention includes a square wave signal generating circuitfor generating a square wave signal whose frequency changes; a MOS transistorwhich is turned on/off on the basis of the square wave signal to supply a driving current to a vibrator; and a frequency shift detecting circuitfor detecting a frequency shift between the square wave signal from the square wave generating circuit and a resonance frequency of the vibrator. The shift in the frequency generated by the square wave generating circuit is trimmed by a signal detected by the frequency shift detecting circuit.