Electronic Component Device and Method for Manufacturing the Same

• US 20110140574A1
• Filed: 02/25/2011
• Published: 06/16/2011
• Est. Priority Date: 08/27/2008
• Status: Active Grant

• Current Assignee: Murata Manufacturing Co Limited
• Original Assignee: Murata Manufacturing Co Limited
• Inventors: Kagayama, Kenji, Unami, Toshihiko
• Granted Patent: US 8,247,954 B2
• Time in Patent Office: Days
• US Class Current: 310/323.01
• CPC Class Codes: B06B 1/0603 using a piezoelectric bender, e.g. bimorph

Abstract

A vibratory device includes an elastic plate and a piezoelectric diaphragm. The elastic plate includes a fixable portion, a vibratory portion, and a connection portion. The fixable portion is fixed to a fixation member. The vibratory portion is spaced away from a fixable surface of the fixable portion that faces the fixation member and arranged substantially in parallel with the fixable surface. The connection portion connects a first end of the fixable portion in its planar direction and a first end of the vibratory portion in its planar direction. The piezoelectric diaphragm is disposed on a surface of the vibratory portion that is adjacent to the fixable portion. In a direction N normal to the surface of the vibratory portion adjacent to the fixable portion, at least part of the second piezoelectric diaphragm does not overlap the fixable portion.

Claims

1. A vibratory device comprising:

an elastic plate including a plate-like fixable portion, a plate-like vibratory portion spaced away from the fixable portion, and a connection portion connecting a first end of the fixable portion to a first end of the vibratory portion; and

a piezoelectric diaphragm disposed on a surface of the vibratory portion that is adjacent to the fixable portion,

wherein, in a direction normal to the surface of the vibratory portion adjacent to the fixable portion, at least part of the piezoelectric diaphragm does not overlap the fixable portion.

2. The vibratory device according to claim 1, wherein the connection portion has an approximately U-shaped cross-section.

3. The vibratory device according to claim 1, wherein the vibratory portion is arranged substantially parallel to the fixable portion.

4. The vibratory device according to claim 1, wherein a length of the fixable portion is shorter than a length of the vibratory portion.

5. The vibratory device according to claim 1, wherein the fixable portion has a cut portion extending from a second end toward the first end thereof.

6. The vibratory device according to claim 5, wherein the cut portion has one of a rectangular shape, a semicircular shape, an elongated semicircular shape, and a semi-elliptical shape.

7. The vibratory device according to claim 1, wherein the fixable portion has a cut portion extending from a first lateral side toward a second lateral side thereof.

8. The vibratory device according to claim 1, wherein the piezoelectric diaphragm includes a pair of electrodes and a piezoelectric body sandwiched between the pair of electrodes.

9. The vibratory device according to claim 8, wherein the vibratory device further comprises a driving circuit for the piezoelectric diaphragm, the driving circuit being electrically coupled to each of the electrodes, the driving circuit being arranged so as to overlap the piezoelectric diaphragm and so as not to overlap the fixable portion in the direction normal to the surface of the vibratory portion adjacent to the fixable portion.

10. The vibratory device according to claim 1, wherein the elastic plate is an insulating material, and the vibratory device further comprises a metal film on at least one surface of the fixable portion.

11. The vibratory device according to claim 10, wherein the vibratory device further comprises a driving circuit for the piezoelectric diaphragm, the driving circuit being arranged so as to overlap the piezoelectric diaphragm and the metal film on the fixable portion in the direction normal to the surface of the vibratory portion adjacent to the fixable portion.