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. 07, 2002
Filed:
Apr. 12, 2000
Hirofumi Tajika, Osaka, JP;
Kazunari Nishihara, Osaka, JP;
Koji Nomura, Osaka, JP;
Motoyuki Taji, Kyoto, JP;
Yoshihiro Tomita, Osaka, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
An acceleration sensor having a well controlled dispersion in the detection, characteristics and improved detection characteristics in the low frequency detection comprises a first piezoelectric plate ( ), a second piezoelectric plate ( ) bonded to the first piezoelectric plate ( ) by direct bonding, a first external electrode ( ) provided on the main surface of the first piezoelectric plate ( ) and a second external electrode ( ) provided on the main surface of the second piezoelectric plate ( ). The first piezoelectric plate ( ) and the second piezoelectric plate ( ) are bonded together with their polarization axes reversed to each other. Appearance of the acceleration sensor resembles to a letter “L” in the cross section; thickness of the supporting section ( ) is greater than that of the rest part (free vibration section).