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公开(公告)号：US10333489B2
公开(公告)日：2019-06-25
申请号：US15255119
申请日：2016-09-01
发明人： Kenji Shimao , Yoshiharu Sato , Hirokazu Iwata
摘要： A crystal unit includes an AT-cut crystal element and a container. The AT-cut crystal element has an approximately rectangular planar shape. The AT-cut crystal element includes a first inclined portion, second inclined portions, and a first secured portion. The first inclined portion is inclined such that the crystal element decreases in thickness from a proximity of the first side to the first side. The second inclined portions are disposed on respective both ends of the first side, the second inclined portions being formed integrally with the first inclined portion. The second inclined portions are inclined gentler than the first inclined portion. The first secured portion and a second secured portion are formed integrally with the second inclined portion. The first secured portion and the second secured portion each project out from the first side to outside the crystal element to be used for securing with the securing members.
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公开(公告)号：US11824516B2
公开(公告)日：2023-11-21
申请号：US17080860
申请日：2020-10-27
发明人： Kenji Shimao , Tetsuya Watanabe , Koji Toshikawa , Hirokazu Iwata
CPC分类号： H03H9/1021 , H03H3/02 , H03H9/02023 , H03H9/0509 , H03H9/19 , H10N30/02 , H10N30/082 , H10N30/88 , H03H2003/022
摘要： A piezoelectric device includes a container and an AT-cut crystal element. The AT-cut crystal element has at least one side surface intersecting with a Z′-axis of the crystallographic axis of the crystal constituted of three surfaces. The first surface is a surface equivalent to a surface formed by rotating the principal surface by 4°±3.5° with an X-axis of the crystal as a rotation axis. The second surface is a surface equivalent to a surface formed by rotating the principal surface by −57°±5° with the X-axis. The third surface is a surface equivalent to a surface formed by rotating the principal surface by −42°±5° with the X-axis. When two corner portions on a side of a second side opposed to the first side of the AT-cut crystal element are viewed in plan view, each of the two corner portions have an approximately right angle.
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公开(公告)号：US10659005B2
公开(公告)日：2020-05-19
申请号：US15086064
申请日：2016-03-31
发明人： Takayuki Kuwahara , Kenji Shimao , Hirokazu Iwata
摘要： An AT-cut crystal element is provided. The AT-cut crystal element includes side surfaces intersecting with a Z′-axis of a crystallographic axis of a crystal. At least one side surface of the side surfaces is constituted of three surfaces of a first surface to a third surface. Besides, a crystal resonator including the AT-cut crystal element, and a crystal unit including the crystal resonator are provided.
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公开(公告)号：US10263597B2
公开(公告)日：2019-04-16
申请号：US15255117
申请日：2016-09-01
发明人： Yoshiharu Sato , Kenji Shimao , Hirokazu Iwata
摘要： A crystal unit includes an AT-cut crystal element, excitation electrodes, extraction electrodes. The AT-cut crystal element has an approximately rectangular planar shape. The excitation electrodes are disposed on front and back of principal surfaces of the AT-cut crystal element. The extraction electrodes are extended from the excitation electrodes to a side of one side of the AT-cut crystal element via a side surface of the AT-cut crystal element. Assuming that an extraction angle of the extraction electrode from the principal surface to the side surface is defined as an angle θ with respect to an X-axis of a crystallographic axis of a crystal, the angle θ is equal to or greater than 59 degrees and equal to or less than 87 degrees.
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