US 12,244,291 B2
Crystal element and crystal device
Yoshiji Matsui, Kyoto (JP)
Assigned to KYOCERA CORPORATION, Kyoto (JP)
Appl. No. 17/615,165
Filed by KYOCERA Corporation, Kyoto (JP)
PCT Filed May 29, 2020, PCT No. PCT/JP2020/021420
§ 371(c)(1), (2) Date Nov. 30, 2021,
PCT Pub. No. WO2020/241849, PCT Pub. Date Dec. 3, 2020.
Claims priority of application No. 2019-101757 (JP), filed on May 30, 2019.
Prior Publication US 2022/0239277 A1, Jul. 28, 2022
Int. Cl. H03H 9/17 (2006.01); H03H 9/13 (2006.01)
CPC H03H 9/17 (2013.01) [H03H 9/13 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A crystal element comprising, defining that a front side of two faces in a front-and-back relation is a first face, a back face is a second face, and a dimension of a direction vertically going through the first face and the second face is a thickness:
a crystal wafer formed to define:
a vibration part that includes a first face and a second face;
a flat plate part that includes a first face and a second face, the flat plate part having a thickness thicker than a thickness of the vibration part and being disposed on an outer edge of the vibration part on a plan view; and
a fixing part that includes a first face and a second face, the fixing part having a thickness thicker than the thickness of the flat plate part and being disposed on in an outer edge of the flat plate part on a plan view;
an excitation electrode disposed on the first face and the second face of the vibration part;
a mounting electrode disposed at least on one of the first face and the second face of the fixing part; and
a wiring electrode that electrically connects the excitation electrode and the mounting electrode;
wherein at least one of the first face and the second face of the flat plate part has an inclined face that becomes thinner as leaving away from the fixing part.