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:
Dec. 09, 2014
Filed:
Jul. 07, 2011
Yasuharu Onishi, Tokyo, JP;
Jun Kuroda, Tokyo, JP;
Motoyoshi Komoda, Tokyo, JP;
Shigeo Satou, Tokyo, JP;
Yukio Murata, Tokyo, JP;
Yuichiro Kishinami, Tokyo, JP;
Nobuhiro Kawashima, Tokyo, JP;
Yasuharu Onishi, Tokyo, JP;
Jun Kuroda, Tokyo, JP;
Motoyoshi Komoda, Tokyo, JP;
Shigeo Satou, Tokyo, JP;
Yukio Murata, Tokyo, JP;
Yuichiro Kishinami, Tokyo, JP;
Nobuhiro Kawashima, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
A second piezoelectric vibrator () is located in a hollow portion () of the first piezoelectric vibrator () when seen in a plan view. A support () is a frame-shaped member, and the inside surface thereof supports the edge of a vibration member (). The fundamental resonance frequency of the first piezoelectric vibrator () is lower than the fundamental resonance frequency of the second piezoelectric vibrator (). In addition, the second piezoelectric vibrator () overlaps a loop of vibration generated in the vibration member () when the first piezoelectric vibrator () is driven at the fundamental resonance frequency. Preferably, the center of the second piezoelectric vibrator () overlaps the center of a loop of vibration generated in the vibration member () by the first piezoelectric vibrator ().