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:
Jul. 05, 2005
Filed:
Dec. 12, 2002
Daisuke Nakamura, Shiga-ken, JP;
Yukio Yoshino, Otsu, JP;
Masaki Takeuchi, Otsu, JP;
Yoshihiko Gotoh, Shiga-ken, JP;
Tadashi Nomura, Kyoto, JP;
Ken-ichi Uesaka, Shiga-ken, JP;
Daisuke Nakamura, Shiga-ken, JP;
Yukio Yoshino, Otsu, JP;
Masaki Takeuchi, Otsu, JP;
Yoshihiko Gotoh, Shiga-ken, JP;
Tadashi Nomura, Kyoto, JP;
Ken-ichi Uesaka, Shiga-ken, JP;
Murata Manufacturing Co., LTD, Kyoto, JP;
Abstract
A piezoelectric resonator includes a substrate and a vibrator. The vibrator includes a thin-film portion having at least one piezoelectric thin-film layer disposed on the substrate and at least one pair of upper and lower electrodes disposed on the substrate. The vibrator has a structure in which the thin-film portion is sandwiched from the upper and lower surfaces thereof by the upper and lower electrodes, which oppose each other in the depth direction, and the overlapping portion of the vibrator defined by the opposing upper and lower electrodes has a tetragonal shape, when viewed in the depth direction, other than a rectangle and a square, the tetragonal shape having substantially parallel sides having a longitudinal length equal to or smaller than about 10 times the oscillatory wavelength and also having at least one portion in which the distance between opposing electrode edges varies.