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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 10819307 B1

PDFFull Text
Date of Patent:
Oct. 27, 2020

Filed:

Aug. 08, 2018

Crystal unit and manufacturing method thereof

Applicant:

Nihon Dempa Kogyo Co., Ltd., Tokyo, JP;

Inventors:

Yoshiharu Sato, Saitama, JP;

Tetsuya Watanabe, Saitama, JP;

Hirokazu Iwata, Saitama, JP;

Shinobu Yoshida, Saitama, JP;

Assignee:

NIHON DEMPA KOGYO CO., LTD., Tokyo, JP;

Attorney:

JCIPRNET

Primary Examiner:

Z Jim Yang

Int. Cl.
CPC ...
H03H 9/13 (2006.01); H01L 41/332 (2013.01); H03B 5/32 (2006.01); H01L 41/053 (2006.01); H01L 41/047 (2006.01); H03H 9/19 (2006.01); H03H 3/02 (2006.01); H03H 9/17 (2006.01); H03H 9/02 (2006.01);
U.S. Cl.
CPC ...
H03H 9/132 (2013.01); H01L 41/0477 (2013.01); H01L 41/0533 (2013.01); H01L 41/332 (2013.01); H03B 5/32 (2013.01); H03H 3/02 (2013.01); H03H 9/02023 (2013.01); H03H 9/177 (2013.01); H03H 9/19 (2013.01); H03B 2200/0018 (2013.01); H03H 2003/022 (2013.01);
Abstract

A crystal unit includes an AT-cut crystal element that has a planar shape in a rectangular shape and a part as a thick portion. The crystal element includes a first end portion, a first depressed portion, the thick portion, a second depressed portion, and a second end portion in an order from a side of one short side in viewing a cross section taken along a longitudinal direction near a center of the short side. The first depressed portion is a depressed portion disposed from the thick portion toward the first end portion side, depressed with a predetermined angle θa and subsequently bulged, and connected to the first end portion. The second depressed portion is a depressed portion disposed from the thick portion toward the second end portion side, depressed with a predetermined angle θb and subsequently bulged, and connected to the second end portion.

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