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. 07, 2015
Filed:
Dec. 08, 2011
Hirofumi Kawashima, Tokyo, JP;
Hirofumi Kawashima, Tokyo, JP;
PIEDEK TECHNICAL LABORATORY, , JP;
Abstract
In a method for manufacturing a quartz crystal unit, a metal film is formed on a quartz crystal wafer which is then etched to form a quartz crystal tuning fork resonator having first and second tines vibratable in flexural and fundamental modes. A groove is chemically etched in a first main surface of both tines such that a first surface of the groove is opposite a first side surface of the corresponding tine. The width of the groove is greater than a distance in the width direction from the groove first surface to the first side surface of the corresponding tine. An electrode is formed on each groove first surface and on the first side surface of both tines with the electrode on the groove first surface of the first tine having the same electrical polarity as the electrode on the first side surface of the second tine.