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. 21, 2023
Filed:
Apr. 28, 2022
Applicant:
Daishinku Corporation, Kakogawa, JP;
Inventor:
Hiroaki Yamashita, Kakogawa, JP;
Assignee:
DAISHINKU CORPORATION, Hyogo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03H 3/04 (2006.01); H03H 9/21 (2006.01); H03H 3/02 (2006.01);
U.S. Cl.
CPC ...
H03H 3/04 (2013.01); H03H 9/21 (2013.01); H03H 2003/026 (2013.01); H03H 2003/0414 (2013.01); H03H 2003/0421 (2013.01); H03H 2003/0442 (2013.01);
Abstract
When a thick frequency adjustment metal film of a tuning fork-type vibration piece is irradiated with a beam on a wafer for frequency coarse adjustment, projections are possibly formed on a roughened end of the frequency adjustment metal film. Such projections are pressurized and pushed down not to chip off under any impact, so that the risk of frequency fluctuations is suppressed.