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:
Jun. 14, 2016
Filed:
Nov. 19, 2014
Nihon Dempa Kogyo Co., Ltd., Tokyo, JP;
Kazuhiro Hirota, Saitama, JP;
Osamu Tokuda, Saitama, JP;
NIHON DEMPA KOGYO CO., LTD., Tokyo, JP;
Abstract
A surface acoustic wave device includes a quartz substrate and a periodic structure portion. The quartz substrate is constituted such that a surface acoustic wave is to propagate on a surface with an Euler angle of (0°, 16°<θ≦18.5°, 0°). The periodic structure portion is disposed on the quartz substrate and includes a plurality of electrodes extending in a direction intersecting with a direction of the propagation of the surface acoustic wave. The electrodes are disposed in parallel to one another along the propagation direction. The periodic structure portion is constituted to mainly contain aluminum. When a width dimension of the electrode in the propagation direction and a separation dimension between the electrodes adjacent to one another are respectively defined as L and S, a metallization ratio η (η=L÷(L+S)) is set to 0.4 or less.