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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.:

US 9553560 B1

PDFFull Text
Date of Patent:
Jan. 24, 2017

Filed:

Oct. 07, 2014

Quartz crystal unit, quartz crystal oscillator and electronic apparatus

Applicant:

Piedek Technical Laboratory, Tokyo, JP;

Inventor:

Hirofumi Kawashima, Tokyo, JP;

Assignee:

PIEDEK TECHNICAL LABORATORY, , JP;

Attorney:

Adams & Wilks

Primary Examiner:

Barbara Summons

Int. Cl.
CPC ...
H03H 9/215 (2006.01); H03B 5/32 (2006.01); H03H 9/21 (2006.01); H03H 3/02 (2006.01); H03H 9/05 (2006.01); H03H 9/10 (2006.01); H04R 17/00 (2006.01); H04R 31/00 (2006.01); H01L 41/22 (2013.01); H01L 41/04 (2006.01); H03H 3/04 (2006.01);
U.S. Cl.
CPC ...
H03H 9/21 (2013.01); H01L 41/04 (2013.01); H01L 41/22 (2013.01); H03B 5/32 (2013.01); H03H 3/02 (2013.01); H03H 9/0547 (2013.01); H03H 9/1021 (2013.01); H03H 9/215 (2013.01); H04R 17/00 (2013.01); H04R 31/00 (2013.01); H03H 2003/026 (2013.01); H03H 2003/0492 (2013.01); Y10T 29/42 (2015.01); Y10T 29/49005 (2015.01); Y10T 29/49007 (2015.01); Y10T 29/4908 (2015.01); Y10T 29/49128 (2015.01); Y10T 29/49133 (2015.01); Y10T 29/49135 (2015.01);
Abstract

In a quartz crystal unit, the unit comprising a case, a quartz crystal tuning fork resonator and a lid, the resonator having a tuning fork base, and first and second tuning fork tines, each of the first and second tuning fork tines having a first side surface and a second side surface opposite the first side surface, the first side surface of the first tuning fork tine confronting the second side surface of the second tuning fork tine; at least one groove having a plurality of surfaces including a first surface being formed in at least one of first and second main surfaces of each of the first and second tuning fork tines so that only the first surface of the at least one groove is directly opposite the first side surface of the corresponding tuning fork tine and a width of the at least one groove is greater than or equal to a distance in the width direction of the at least one groove measured from an outer edge of the at least one groove to an outer edge of the corresponding one of the first and second tuning fork tines and less than 0.07 mm.

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