Crystal vibrating device and method for producing the same

Patent metadata

Field	Value
Publication number	US-10097157-B2
Application number	US-201514920419-A
Country	US
Kind code	B2
Filing date	Oct 22, 2015
Priority date	May 1, 2013
Publication date	Oct 9, 2018
Grant date	Oct 9, 2018

Abstract

A crystal vibrating device that includes a crystal resonator mounted on a substrate by a first conductive adhesive layer and a second conductive adhesive layer, and, when the first conductive adhesive layer and the second conductive adhesive layer are viewed in a plan view, the first conductive adhesive layer and the second conductive adhesive layer each have a) a planar shape in which two circles or ellipses are partly superimposed upon each other, b) two conductive adhesive layer portions that are separated from each other, or c) a length direction and an aspect ratio, which is a ratio between a maximum size in the length direction and a maximum size in a width direction that is orthogonal to the maximum size in the length direction, is in a range of 1.5 to 3.0.

First claim

The invention claimed is:

1. A crystal vibrating device comprising:
a package material having a crystal resonator mounting surface;
a first electrode land and a second electrode land on the crystal resonator mounting surface of the package material;
a crystal resonator supported in a cantilever manner at the crystal resonator mounting surface of the package material, the crystal resonator including a crystal element, a first vibrating electrode and a second vibrating electrode on the crystal element, and a first extended electrode and a second extended electrode that extend from the first vibrating electrode and the second vibrating electrode, respectively; and
a first conductive adhesive layer and a second conductive adhesive layer that electrically connect and mechanically join the first extended electrode and the second extended electrode to the first electrode land and the second electrode land, respectively,
wherein, when the first conductive adhesive layer and the second conductive adhesive layer are viewed in a plan view, the first conductive adhesive layer and the second conductive adhesive layer each have a planar shape in which two circles or ellipses are partly superimposed upon each other,
wherein the crystal element has a shape of a rectangular plate having a pair of long sides and a pair of short sides, a direction in which the short sides extend is a width direction, and the crystal resonator is supported in the cantilever manner at one of the pair of short sides by the first conductive adhesive layer and the second conductive adhesive layer,
wherein a first center of gravity of the first conductive adhesive layer is positioned outwardly in the width direction from a center of the first conductive adhesive layer, and a second center of gravity of the second conductive adhesive layer is positioned outwardly in the width direction from a center of the second conductive adhesive layer, and
wherein the first electrode land and the second electrode land have a first thickness at an outer side thereof distal from a center of the crystal element and a second thickness at an inner side thereof proximal to the center of the crystal element, the first thickness being greater than the second thickness.

2. The crystal vibrating device according to claim 1 ,
wherein the first conductive adhesive layer and the second conductive adhesive layer are elongated in a direction that extends from the short side towards a center of the crystal element.

3. The crystal vibrating device according to claim 1 , wherein a first portion of the first conductive adhesive layer and a second portion of the second conductive adhesive layer are directly joined to a surface of the crystal element.

4. The crystal vibrating device according to claim 1 , wherein the first conductive adhesive layer and the second conductive adhesive layer are each formed of epoxy resin and a conductive material.

5. A crystal vibrating device comprising:
a package material having a crystal resonator mounting surface;
a first electrode land and a second electrode land on the crystal resonator mounting surface of the package material;
a crystal resonator supported in a cantilever manner at the crystal resonator mounting surface of the package material, the crystal resonator including a crystal element, a first vibrating electrode and a second vibrating electrode on the crystal element, and a first extended electrode and a second extended electrode that extend from the first vibrating electrode and the second vibrating electrode, respectively; and
a first conductive adhesive layer and a second conductive adhesive layer that electrically connect and mechanically join the first extended electrode and the second extended electrode to the first electrode land and the second electrode land, respectively,
wherein the first conductive adhesive layer and the second conductive adhesive layer each include two conductive adhesive layer portions that are separated from each other,
wherein the crystal element has a shape of a rectangular plate having a pair of long sides and a pair of short sides, a direction in which the short sides extend is a width direction, and the crystal resonator is supported in the cantilever manner at one of the pair of short sides by the first conductive adhesive layer and the second conductive adhesive layer,
wherein a first center of gravity of the first conductive adhesive layer is positioned outwardly in the width direction from a center of the first conductive adhesive layer, and a second center of gravity of the second conductive adhesive layer is positioned outwardly in the width direction from a center of the second conductive adhesive layer, and
wherein the first electrode land and the second electrode land have a first thickness at an outer side thereof distal from a center of the crystal element and a second thickness at an inner side thereof proximal to the center of the crystal element, the first thickness being greater than the second thickness.

6. The crystal vibrating device according to claim 5 ,
wherein the first conductive adhesive layer and the second conductive adhesive layer are elongated in a direction that extends from the short side towards a center of the crystal element.

7. The crystal vibrating device according to claim 5 , wherein a first portion of the first conductive adhesive layer and a second portion of the second conductive adhesive layer are directly joined to a surface of the crystal element.

8. The crystal vibrating device according to claim 5 , wherein the first conductive adhesive layer and the second conductive adhesive layer are each formed of epoxy resin and a conductive material.

9. The crystal vibrating device according to claim 1 , wherein the first conductive adhesive layer and the second conductive adhesive layer each have a length direction and each have an aspect ratio, which is a ratio between a maximum size in the length direction and a maximum size in a width direction that is orthogonal to the maximum size in the length direction, in a range of 1.5 to 3.0.

10. The crystal vibrating device according to claim 5 , wherein the first conductive adhesive layer and the second conductive adhesive layer each have a length direction and each have an aspect ratio, which is a ratio between a maximum size in the length direction and a maximum size in a width direction that is orthogonal to the maximum size in the length direction, in a range of 1.5 to 3.0.

Assignees

• Murata Manufacturing Co

Inventors

• Okamoto Bunta
• Sakai Motoyoshi

Classifications

• H03H3/02

  for the manufacture of piezoelectric or electrostrictive resonators or networks (H03H3/08 takes precedence) · CPC title

• H03H9/0509 Primary

  consisting of adhesive elements · CPC title

• H03H9/10 Primary

  Mounting in enclosures {(constructional combinations of enclosure with electromechanical and other electronic elements H03H9/0538)} · CPC title

• H03H9/17

  having a single resonator (crystal tuning forks H03H9/21) · CPC title

• H03H9/1021

  the BAW device being of the cantilever type · CPC title