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. 08, 2003
Filed:
Jan. 25, 2002
Applicant:
Inventor:
Muneharu Yamashita, Toyama-ken, JP;
Assignee:
Murata Manufacturing Co., Ltd., Kyoto, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01P 1/509 ;
U.S. Cl.
CPC ...
G01P 1/509 ;
Abstract
An acceleration sensor includes a bridge circuit including two capacitors and two piezoelectric vibrators on which reverse stresses are exerted by acceleration, and a voltage-dividing impedance circuit provided between a second junction point and a third junction point. The signal of a voltage-dividing point of the voltage-dividing impedance circuit is fed back to a first junction point, so that an oscillation circuit is provided. An oscillating-output phase difference between the second and third junction points is detected by a phase-difference-signal processing circuit and is output as an acceleration-detection signal.