Tuning-fork type crystal resonator plate and crystal resonator device

Patent metadata

Field	Value
Publication number	US-9748922-B2
Application number	US-201414782986-A
Country	US
Kind code	B2
Filing date	Mar 12, 2014
Priority date	Apr 11, 2013
Publication date	Aug 29, 2017
Grant date	Aug 29, 2017

Abstract

A tuning-fork type crystal resonator plate includes a base portion and a pair of leg portions protruding from the base portion in one direction. A groove and a bank portion are formed on at least one of main surfaces of each of the leg portions. The bank portion is formed accompanied by the formation of the groove, and a width of the bank portion differs along a width direction. The bank portion is constituted by a thick portion having a large width and a thin portion having a small width.

First claim

The invention claimed is:

1. A tuning-fork type crystal resonator plate, comprising:
a base portion; and a pair of leg portions protruding from the base portion in one direction,
wherein a groove and a bank portion are formed on at least one of main surfaces of each of the leg portions,
wherein the bank portion is formed accompanied by the formation of the groove
wherein a width of the bank portion differs along a thickness direction and the bank portion is constituted by a thick portion having a large width and a thin portion having a small width,
wherein the groove is formed so as to be deviated relative to a center of the leg portion in a width direction, and
wherein widths from a lowermost point of the groove to respective side surfaces of the leg portion in cross-sectional view in the width direction are the same.

2. The tuning-fork type crystal resonator plate according to claim 1 ,
wherein the thick portion has a trapezoidal shape in cross-sectional view in the width direction, and
wherein the thick portion is located in the width direction where a lowermost point of the groove is positioned.

3. The tuning-fork type crystal resonator plate according to claim 2 ,
wherein a top surface of the trapezoid of the thick portion faces a side surface of the groove.

4. A crystal resonator device comprising the tuning-fork type crystal resonator plate according to claim 2 .

5. A crystal resonator device comprising the tuning-fork type crystal resonator plate according to claim 3 .

6. The tuning-fork type crystal resonator plate according to claim 1 ,
wherein, in the main surfaces of the leg portion, the respective grooves are formed in a first main surface and a second main surface, and
wherein the lowermost point of the groove in the first main surface and the lowermost point of the groove in the second main surface are opposed to each other in cross-sectional view in a protruding direction.

7. A crystal resonator device comprising the tuning-fork type crystal resonator plate according to claim 6 .

8. A crystal resonator device comprising the tuning-fork type crystal resonator plate according to claim 1 .

9. A tuning-fork type crystal resonator plate, comprising:
a base portion; and a pair of leg portions protruding from the base portion in one direction,
wherein a groove and a bank portion are formed on at least one of main surfaces of each of the leg portions,
wherein the bank portion is formed accompanied by the formation of the groove,
wherein a width of the bank portion differs along a thickness direction and the bank portion is constituted by a thick portion having a large width and a thin portion having a small width,
wherein the thick portion has a trapezoidal shape in cross-sectional view in the width direction,
wherein the thick portion is located in the width direction where a lowermost point of the groove is positioned, and
wherein a top surface of the trapezoid of the thick portion faces a side surface of the groove.

10. The tuning-fork type crystal resonator plate according to claim 9 ,
wherein, in the main surfaces of the leg portion, the respective grooves are formed in a first main surface and a second main surface, and
wherein the lowermost point of the groove in the first main surface and the lowermost point of the groove in the second main surface are opposed to each other in cross-sectional view in a protruding direction.

11. A crystal resonator device comprising the tuning-fork type crystal resonator plate according to claim 9 .

12. A crystal resonator device comprising the tuning-fork type crystal resonator plate according to claim 10 .

Assignees

• Daishinku Corp

Inventors

• Ishino Satoru
• Sakamoto Yoshinobu

Classifications

• H03H9/215 Primary

  consisting of quartz · CPC title

• H03H9/1021

  the BAW device being of the cantilever type · CPC title

• H03H9/13

  for networks consisting of piezoelectric or electrostrictive materials (for networks using surface acoustic waves H03H9/145) · CPC title

• H03H9/21 Primary

  Crystal tuning forks · CPC title