US 12,407,321 B2
Quartz-crystal vibrating piece, crystal unit, crystal controlled oscillator, and intermediate wafer for quartz-crystal vibrating piece
Tatsuya Fujita, Saitama (JP); and Yukihiro Okajima, Saitama (JP)
Assigned to NIHON DEMPA KOGYO CO., LTD., Tokyo (JP)
Filed by NIHON DEMPA KOGYO CO., LTD., Tokyo (JP)
Filed on Feb. 28, 2024, as Appl. No. 18/590,917.
Claims priority of application No. 2023-036463 (JP), filed on Mar. 9, 2023.
Prior Publication US 2024/0305264 A1, Sep. 12, 2024
Int. Cl. H03H 9/02 (2006.01); H03B 5/32 (2006.01); H03H 9/05 (2006.01); H03H 9/10 (2006.01); H03H 9/19 (2006.01)
CPC H03H 9/02133 (2013.01) [H03B 5/32 (2013.01); H03H 9/02157 (2013.01); H03H 9/0557 (2013.01); H03H 9/1021 (2013.01); H03H 9/19 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A quartz-crystal vibrating piece comprising:
an element unit including:
a vibrator that has a quadrilateral shape in plan view, vibrates in a thickness-shear mode, and has a thickness t1;
a first thick portion that has a rectangular shape in plan view, has a short side connected to one side of the vibrator, extends in a first direction, and has a thickness t2 thicker than the thickness t1; and
second thick portions connected to both side surfaces of an end portion of the first thick portion in an opposite side of the vibrator, each of the second thick portions extending along a second direction intersecting with the first direction and having a thickness t3 thicker than the thickness t1 and same as or different from the thickness t2, the second thick portions being used for connecting the quartz-crystal vibrating piece to an external member;
excitation electrodes disposed on both front and back sides of the vibrator; and
an extraction electrode provided from the excitation electrode to the second thick portion via the first thick portion,
wherein,
when a dimension along the first direction of the vibrator is a, and a dimension along the first direction of a portion of the first thick portion excluding a portion in contact with the second thick portions is β,β>α is met.