Piezoelectric component

• US 6,057,634 A
• Filed: 08/24/1998
• Issued: 05/02/2000
• Est. Priority Date: 10/03/1997
• Status: Expired due to Term

• Current Assignee: Murata Manufacturing Co Limited
• Original Assignee: Murata Manufacturing Co Limited
• Inventors: Fujita, Yuji, Yoshino, Hirohide
• Primary Examiner(s): Ramirez, Nestor
• Assistant Examiner(s): MEDLEY, PETER M
• Application Number:
  US09/138,970
• Time in Patent Office: 617 Days
• Field of Search: 310/344, 310/345, 310/348, 310/351, 310/352, 310/353
• US Class Current: 310/348
• CPC Class Codes: H03H 9/0514 consisting of mounting pads or bumps
• CPC Class Codes: H03H 9/1014 the enclosure being defined by a frame built on a substrate and a cap, the frame having no mechanical contact with the BAW device
• CPC Class Codes: H03H 9/178 of a laminated structure of multiple piezoelectric layers with inner electrodes
• CPC Class Codes: H03H 9/605 consisting of a ladder configuration

Abstract

A piezoelectric component includes a substrate on which pattern electrodes are disposed. A piezoelectric resonator is placed on the substrate. The piezoelectric resonator generates a longitudinal vibration and includes a base member. External electrodes are disposed at both sides of a groove formed on one side surface of the base member. At the center of the base member in the longitudinal direction, support members made from an electrically conductive material are provided on the external electrodes. The support members are bonded to the pattern electrodes of the substrate via electrically conductive adhesive. An insulating adhesive is disposed between the support members. As a result of this structure, the piezoelectric component has a sufficient bonding strength between the base member and the piezoelectric resonator and prevents a short circuit from occurring between the support members formed in the piezoelectric resonator.

Claims

1. An electronic component, comprising:

a substrate having pattern electrodes disposed thereon;

a piezoelectric resonator disposed on said substrate and including a base member and at least two external electrodes provided on at least one side surface of the base member;

at least two electrically conductive bonding members between the pattern electrodes and the at least two external electrodes and arranged to support said piezoelectric resonator on said substrate, the at least two electrically conductive bonding members having inner surfaces disposed opposite to each other so as to face each other; and

an insulating bonding member disposed only between said inner surfaces of said at least two electrically conductive bonding members.

2. An electronic component according to claim 1, wherein said insulating bonding member is an insulating protrusion which is disposed on said substrate between said at least two electrically conductive bonding members.

3. An electronic component according to claim 1, wherein said piezoelectric resonator is adapted to vibrate in a longitudinal vibration mode.

4. An electronic component according to claim 1, further comprising electrically conductive support members disposed on the at least two external electrodes of said piezoelectric resonator, wherein the pattern electrodes of the substrate are connected to the two external electrodes through said support members.

5. An electronic component according to claim 1, wherein the base member comprises a laminated unit including piezoelectric layers and inner electrodes connected to the external electrodes, the piezoelectric layers being polarized in the longitudinal direction of the base member, and said piezoelectric resonator is vibrated in a longitudinal vibration in a basic mode when an electric field is applied thereto.

6. An electronic component according to claim 1, wherein the base member includes a groove formed in a surface thereof, the groove being arranged to separate each of the at least two external electrodes and the at least two electrically conductive bonding members.

7. An electronic component according to claim 1, wherein each of the at least two electrically conductive bonding members has a width that is substantially equal to a width of a respective one of the at least two external electrodes.

8. An electronic component according to claim 1, wherein a polarization direction, a direction of application of electric field and a direction vibration of the piezoelectric resonator are the same.

9. An electronic component according to claim 1, wherein the at least two electrically conductive bonding members are located at an approximate center portion of the piezoelectric resonator and support the piezoelectric resonator at a location of a vibration node thereof.

10. An electronic component according to claim 1, wherein the insulating bonding member is disposed in contact with side surfaces of the at least two electrically conductive bonding members.

11. An electronic component according to claim 1, wherein each of said support members are shaped such that an area of a surface thereof located at a side of the pattern electrodes is smaller than that of a surface thereof at a side of the external electrodes, and a distance between said at least two support members is larger at the side of the pattern electrodes than a distance between said at least two support members at the side of the external electrodes.

12. An electronic component according to claim 1, wherein each of said at least support members includes a curved slope portion.

13. An electronic component according to claim 1, wherein each of said at least support members includes a slanted portion.

14. An electronic component, comprising:

a substrate having pattern electrodes disposed thereon;

a piezoelectric resonator disposed on said substrate and including a base member and at least two external electrodes provided on at least one side surface of the base member; and

at least two electrically conductive support members disposed on the two external electrodes so as to connect the pattern electrodes and the two external electrodes and arranged to support said piezoelectric resonator on said substrate;

wherein

each of said support members are shaped such that an area of a surface thereof at a side of the pattern electrodes is smaller than that of a surface at a side of the external electrodes, and a distance between said at least two support members is larger at the side of the pattern electrodes than at the side of the external electrodes.

15. An electronic component according to claim 14, wherein said support members and the pattern electrodes are connected via said electrically conductive support members.

16. An electronic component according to claim 14, further comprising an insulating bonding member disposed between said at least two electrically conductive bonding members.

17. An electronic component according to claim 16, wherein said insulating bonding member is an insulating protrusion which is disposed on said substrate between said at least two electrically conductive bonding members.

18. An electronic component according to claim 16, wherein the insulating bonding member is disposed in contact with side surfaces of the at least two electrically conductive bonding members.

19. An electronic component according to claim 14, wherein each of said at least two support members includes a curved slope portion.

20. An electronic component according to claim 14, wherein each of said at least two support members includes a slanted portion.