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. 29, 2014
Filed:
Oct. 30, 2013
Seiko Epson Corporation, Tokyo, JP;
Takuya Owaki, Kamiina, JP;
Kunihito Yamanaka, Kamiina, JP;
Keigo Iizawa, Sakata, JP;
Kenichi Hano, Minamisoma, JP;
Seiko Epson Corporation, , JP;
Abstract
A surface acoustic wave resonator includes a quartz substrate with preselected Euler angles and an IDT on the quartz substrate. The IDT includes electrode fingers and excites a stop band upper end mode surface acoustic wave. Inter-electrode finger grooves are provided between the electrode fingers. Assuming a surface acoustic wave wavelength is λ, an electrode finger film thickness is H, an inter-electrode finger groove depth is G, a line occupation rate of convex portions of the substrate between the inter-electrode finger grooves is ηg, and a line occupation rate of the electrode fingers on the convex portions is ηe, 0.0407λ≦G+H; and ηg>ηe.