JCIPRNET
Crystal unit and manufacturing method thereof
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.
NIHON DEMPA KOGYO CO., LTD.
H H H H H H H H H H H
H01L H03H H03B H03H H03H H03H H03H H03H H01L H01L H03B
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Shinobu Yoshiharu Tetsuya Hirokazu
Yoshida Sato Watanabe Iwata