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:
Sep. 28, 2010
Filed:
Sep. 25, 2007
Ryuta Nishizawa, Suwa, JP;
Masako Tanaka, Okaya, JP;
Ryuta Nishizawa, Suwa, JP;
Masako Tanaka, Okaya, JP;
Seiko Epson Corporation, Tokyo, JP;
Abstract
An acceleration sensor having a vibrating body includes: a base fixed to a pedestal; an oscillating arm extended from the base in a beam-like shape, oscillating transversally in a planer direction at a predetermined resonant frequency. Here, the oscillating arm includes: an oscillating block defined by a through hole opened through a thickness direction at a widthwise center of the oscillating arm, the through hole extending in a lengthwise direction thereof; an added mass being a junction of a distal end of the oscillating block defined by the through hole; and an excitation means installed on the oscillating arm. At this time, the oscillating arm is supported by the base and by the added mass, either in a pseudo-dual anchor structure or a single anchor structure. With the above configuration, the acceleration sensor detects a resonant frequency variability of the vibrating body caused by an inertial effect of the added mass under acceleration.