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:
Mar. 16, 2010
Filed:
Jan. 06, 2005
Tsutomu Igaki, Hyogo, JP;
Kazunori Nishimura, Kyoto, JP;
Kazuo Ikeda, Osaka, JP;
Ken Matsunami, Osaka, JP;
Tsutomu Igaki, Hyogo, JP;
Kazunori Nishimura, Kyoto, JP;
Kazuo Ikeda, Osaka, JP;
Ken Matsunami, Osaka, JP;
Panasonic Corporation, Osaka, JP;
Abstract
A surface acoustic wave resonator has a piezoelectric substrate (), an IDT () formed of a plurality of electrode fingers () disposed on piezoelectric substrate (), and reflectors () disposed near the opposite ends of IDT (). The IDT () has a gradation region where the electrode finger pitch of the plurality of electrode fingers () at the opposite ends is different from the electrode finger pitch near the center of the IDT (). In this gradation region, the electrode finger pitches are sequentially varied in the range from the electrode finger at the farthest end that is one end of the gradation region to the electrode finger lying at the other end of the gradation region. The electrode finger pitch of the electrode fingers at the farthest end that is one end of the gradation region is set to be 1 through 5% smaller than the electrode finger pitch near the center of the IDT ().