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. 28, 2006
Filed:
Jul. 18, 2003
Yoshihiko Gotoh, Shiga-ken, JP;
Hajime Yamada, Otsu, JP;
Tadashi Nomura, Kyoto, JP;
Masaki Takeuchi, Otsu, JP;
Yoshihiko Gotoh, Shiga-ken, JP;
Hajime Yamada, Otsu, JP;
Tadashi Nomura, Kyoto, JP;
Masaki Takeuchi, Otsu, JP;
Murata Manufacturing Co., Ltd., Kyoto, JP;
Abstract
A piezoelectric filter and other electronic components are constructed such that the accuracy of frequency adjustment can be increased and an improvement in efficiency of the adjustment operation can be achieved. The piezoelectric filter includes a plurality of piezoelectric resonators including a substrate and a vibration portion provided on the substrate, the vibration portion having a structure in which the top and bottom surfaces of a thin film portion including at least one piezoelectric thin film are sandwiched between at least a pair of an upper electrode and a lower electrode facing each other, wherein the upper electrode of a predetermined piezoelectric resonator is made of a material having susceptibility to etching that is different from that of the upper electrode of the other piezoelectric resonator.