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:
Feb. 15, 2011
Filed:
Jul. 27, 2007
Masakazu Yoshio, Takaoka, JP;
Koichi Yamasaki, Omihachiman, JP;
Masakazu Yoshio, Takaoka, JP;
Koichi Yamasaki, Omihachiman, JP;
Murata Manufacturing Co., Ltd., Kyoto-fu, JP;
Abstract
TO reduce frequency variations caused by a change in frequency constant and suppress unnecessary vibrations in the case where the frequency constant of apiezoelectric substrate has a gradient. A piezoelectric resonator has vibrating electrodesandfacing each other, which are formed on two major surfaces of apiezoelectric substrate Ia, and trapped vibrations are generated between the two vibrating electrodes. The piezoelectric substrate Ia has a constant thickness. The frequency constant of the piezoelectric substrate Ia has a gradient in a surface direction. The vibrating electrodesandare formed to have a gradient thickness so that the thickness gradually increases as the frequency constant of the piezoelectric substrate increases. By forming the vibrating electrodes to have a gradient thickness, unnecessary in-band vibrations are suppressed, and frequency variations are reduced.