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:
Dec. 03, 2013
Filed:
Dec. 02, 2011
Takuya Owaki, Kamiina, JP;
Kunihito Yamanaka, Kamiina, JP;
Keigo Iizawa, Sakata, JP;
Kenichi Hano, Minamisoma, 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 crystal substrate with Euler angles (−1.5°≦φ≦1.5°, 117°≦θ≦142°, and 42.79°≦|Ψ|≦49.57°), and an IDT provided on the quartz crystal substrate that includes a plurality of electrode fingers and excites a stop band upper end mode surface acoustic wave. Inter-electrode finger grooves are provided between the electrode fingers. If a line occupation rate of the convex portions of the quartz crystal substrate disposed between the inter-electrode finger grooves is ηg, and a line occupation rate of the electrode fingers disposed on the convex portions is ηe, η>ηand 0.59<η<0.73 are satisfied when an effective line occupation rate ηeff of the IDT is an arithmetic mean of the line occupation rate ηg and the line occupation rate ηe.