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:
Nov. 30, 2010
Filed:
Sep. 25, 2006
Takuya Owaki, Chigasaki, JP;
Yuji Mitsui, Chino, JP;
Yuzuru Yoshizawa, Minamisoma, JP;
Seiko Epson Corporation, Tokyo, JP;
Abstract
An SH wave type surface acoustic wave device includes a piezoelectric substrate and an IDT electrode provided on the piezoelectric substrate and constituted of Al or an alloy mainly containing Al and that uses a SH wave as an excitation wave. The piezoelectric substrate is a crystal plate in which a cut angle θ of a rotary Y cut quartz substrate is set in a range of −64.0°<θ<−49.3° in a counter-clockwise direction from a crystal axis Z and in which a surface acoustic wave propagation direction is set at 90°±5° with respect to a crystal axis X. An electrode film thickness H/λ standardized by a wavelength of the IDT electrode is 0.04<H/λ<0.12, where λ is a wavelength of the surface acoustic wave to be excited, and a main surface of the piezoelectric substrate is etched by a thickness of 0.002 μm or more.