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:
Jan. 31, 2023
Filed:
Jul. 31, 2021
Applicant:
The Japan Steel Works, Ltd., Tokyo, JP;
Inventors:
Kazuhito Kishida, Tokyo, JP;
Shoji Kakio, Kofu, JP;
Kengo Ogawa, Tokyo, JP;
Hiroaki Yokota, Tokyo, JP;
Assignee:
THE JAPAN STEEL WORKS, LTD., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03H 9/02 (2006.01); H03F 3/19 (2006.01); H03H 9/145 (2006.01); H03H 9/56 (2006.01); H04B 1/40 (2015.01); H03H 3/08 (2006.01);
U.S. Cl.
CPC ...
H03H 9/02551 (2013.01); H03F 3/19 (2013.01); H03H 3/08 (2013.01); H03H 9/145 (2013.01); H03H 9/56 (2013.01); H04B 1/40 (2013.01); H03F 2200/171 (2013.01); H03F 2200/451 (2013.01);
Abstract
In a surface acoustic wave resonator according to an embodiment, a quartz-crystal substrate includes an AT-cut 0° X-propagation first quartz-crystal substrate and a Z-cut second quartz-crystal substrate bonded over the first quartz-crystal substrate. A propagation direction of a surface acoustic wave in the second quartz-crystal substrate is inclined from an X-axis of a crystal by 27 to 33°, 87 to 93°, or 147 to 153°, and a thickness of the second quartz-crystal substrate is 0.2 to 1.0 times a wavelength of the surface acoustic wave.