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:
Sep. 11, 2012
Filed:
Feb. 24, 2010
Satoru Matsuda, Kawasaki, JP;
Michio Miura, Kawasaki, JP;
Takashi Matsuda, Kawasaki, JP;
Taiyo Yuden Co., Ltd., Tokyo, JP;
Abstract
A boundary acoustic waves device includes a piezoelectric substrate having piezoelectricity, interdigitated electrodes formed on the piezoelectric substrate, a first medium formed on the piezoelectric substrate so as to cover the interdigitated electrode, and a second medium formed on the first medium. The interdigitated electrodes include a plurality of electrode fingers and bus bars that connect ends of the plurality of electrode fingers. A third medium is formed on the first medium. The second medium and the third medium are in contact with the first medium. The first medium, the second medium, and the third medium are formed of different materials. The first medium, the second medium, and the third medium are different in a ratio in length of a part with the third medium formed with respect to a length of a propagation path of boundary acoustic waves in a cross-section perpendicular to a longitudinal direction of the electrode fingers, in the longitudinal direction of the electrode fingers.