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:
Oct. 20, 1998
Filed:
Nov. 15, 1996
Tohru Kouhei, Kawasaki, JP;
Takahiro Imamura, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
An acceleration sensor is provided which has a plurality of piezoelectric elements having polarization directions which are different from the direction of the acceleration to be detected and which have electrodes provided on both sides are mounted to a substrate, or a singly formed piezoelectric element having a plurality of polarizations with independent electrodes provided for each region is mounted to a substrate, a series electrical connection being made between the substrate side electrodes and the free end electrodes of the piezoelectric elements, the electrodes between which the piezoelectric element are series connected being led out to two electrodes provided on the substrate, and a weight being mounted over and such a manner as to straddle the plurality of piezoelectric elements or singly formed piezoelectric element. When an acceleration acts on this acceleration sensor, the force of inertia of the weight applies a stress to each piezoelectric element, causing the generation of a voltage. Because the piezoelectric elements are connected in series, the voltage that is generated at each piezoelectric element is a voltage corresponding to the superimposition of the acceleration to which each of the piezoelectric element or each region of a singly formed piezoelectric element is subjected. As a result, it is possible to simplify and make smaller the configuration of the acceleration sensor and further possible to achieve an acceleration sensor with a large output.