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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 8866567 B1

PDFFull Text
Date of Patent:
Oct. 21, 2014

Filed:

Feb. 15, 2013

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); H03B 5/36 (2006.01); H01L 41/053 (2006.01); H03H 9/10 (2006.01); H03H 9/05 (2006.01); H04R 31/00 (2006.01); H03H 9/21 (2006.01); H01L 41/04 (2006.01); H01L 41/22 (2013.01); H04R 17/00 (2006.01); H03H 3/02 (2006.01); H03H 3/04 (2006.01);
U.S. Cl.
CPC ...
H01L 41/22 (2013.01); H03H 2003/026 (2013.01); H03H 2003/0492 (2013.01); H03H 9/1021 (2013.01); H03H 9/0547 (2013.01); H04R 31/00 (2013.01); H03H 9/21 (2013.01); H03B 5/32 (2013.01); H01L 41/04 (2013.01); H04R 17/00 (2013.01); H03H 9/215 (2013.01); H03H 3/02 (2013.01);
Abstract

A quartz crystal unit has a quartz crystal tuning fork resonator having a thickness within a range of 0.05 mm to 0.18 mm, and at least one groove formed in at least one of opposite main surfaces of each of first and second tuning fork tines so that a length of the at least one groove is within a range of 20% to 78% of an overall length of the resonator and less than 1.29 mm. An electrode is disposed on at least one of a base portion and a surface of the at least one groove so that the electrode of the first tuning fork tine has an electrical polarity opposite to an electrical polarity of the electrode of the second tuning fork tine. The capacitance ratio rof a second overtone mode of vibration of the quartz crystal tuning fork resonator is greater than 1500. The quartz crystal tuning fork resonator is housed in a case having an open end, and a lid is connected to the case.

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