JPH1070320A - Piezoelectric transformer component - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent generation of audible-frequency vibration sound by electrically connecting a drive electrode with an input terminal, a power-generating electrode with an output terminal, through a conductive elastic body provided on the surface of the drive electrode and the power-generating electrode. SOLUTION: An elastic thick film 10 is formed by printing Ag paste which has elasticity on the surface of the drive electrode 4 and the power-generating electrode 5 of a piezoelectric transformer main body 1. Then, an input terminal 19 composed of a metal plate input terminal 13 arranged on an armor case 11 and a metal spring, the drive electrode 4, power-generating electrode 5 and an output terminal 12 composed of a metal plate spring are connected through the elastic thick film 10, and the piezoelectric transformer main body 1 is fixed in the armor case 11. Since the metal plate spring, which forms the output terminals 12 and the input terminal 19, and the elastic thick film 10 absorbs mechanical vibration generated, generation of vibration sound is prevented and the highly reliable piezoelectric transformer component is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a highly reliable piezoelectric transformer component for converting an AC voltage in electronic equipment or the like.

[0002]

2. Description of the Related Art In recent years, liquid crystal displays have rapidly become widespread in personal computers, cameras, and the like, and at the same time, miniaturization due to portability has been accelerated.

For lighting the backlight of this liquid crystal display, the structure is simple, the thickness can be reduced, and the noise can be reduced.
Attention has been paid to piezoelectric transformers having high conversion efficiency.

Hereinafter, a conventional piezoelectric transformer component will be described. FIG. 4 shows the appearance of a conventional piezoelectric transformer. In FIG. 4, reference numeral 1 denotes a piezoelectric transformer main body,
And a power generation unit 3. A drive electrode 4 is provided on the front and back surfaces of the drive unit 2, and a power generation electrode 5 is provided on the front and back ends of the power generation unit 3. A lead wire 6 is connected to the drive electrode 4 and the power generation electrode 5 by solder 7. Then, as shown in FIG. 5, the piezoelectric transformer main body 1 was housed in the outer case 9 using a silicone adhesive 8 having rubber elasticity.

[0005]

In the above-mentioned conventional configuration,
There has been a problem that resonance occurs in the lead wire 6 due to mechanical vibration when the piezoelectric transformer component is driven, and a beat sound is generated.

Accordingly, an object of the present invention is to provide a highly reliable piezoelectric transformer component capable of preventing generation of audible frequency vibration sound.

[0007]

In order to achieve this object, a piezoelectric transformer component according to the present invention comprises an outer case having two input terminals and one output terminal, and a Rosen-type piezoelectric housed in the outer case. A transformer element, wherein the Rosen-type piezoelectric transformer element is provided with a drive electrode on one of the front and back sides of a rectangular piezoelectric transformer body and a power generation electrode on the other, and a conductive elastic material is provided on the drive electrode and the power generation electrode surface. A piezoelectric transformer component in which the drive electrode and the input terminal, and the power generation electrode and the output terminal are electrically connected through the conductive elastic body. Can be.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention comprises an outer case having two input terminals and one output terminal, and a Rosen-type piezoelectric transformer element housed in the outer case. The Rosen-type piezoelectric transformer element has a rectangular piezoelectric transformer body in which a drive electrode is provided on one of the front and back surfaces, a power generation electrode is provided on the other, and a conductive elastic body is provided on the drive electrode and the power generation electrode surface. And a piezoelectric transformer component that electrically connects the drive electrode and the input terminal and the power generation electrode and the output terminal via the conductive elastic body, wherein the conductive elastic body absorbs mechanical vibration. Therefore, generation of audible frequency vibration sound can be prevented.

According to a second aspect of the present invention, at least one of the input terminals and the output terminal are formed of a metal leaf spring, and the piezoelectric transformer component according to the first aspect of the present invention requires soldering of a lead wire. Disappears.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
This will be described with reference to 2 and 3. Embodiment 1 FIG. 3 shows a cross section of a general Rosen secondary (λ mode) type piezoelectric transformer. In FIG. 3, reference numeral 1 denotes a dotted line 21 indicating a displacement distribution of vibration during driving of the piezoelectric transformer main body. Reference numeral 20 denotes a node of vibration, which is a point at which vibration does not occur. The piezoelectric transformer main body 1 is composed of a driving unit 2 and a power generation unit 3. An independent driving electrode 4 is provided on the front and back surfaces of the driving unit 2, and a power generation electrode is provided on the front and rear surfaces of the power generation unit 3. 5 are provided.

FIG. 1 is a sectional view of a piezoelectric transformer component according to the present embodiment. In FIG. 1, the surface of the drive electrode 4 and the power generation electrode 5 of the piezoelectric transformer main body 1 has elasticity A
The elastic paste 10 is formed by printing the g paste. The outer case 1 is provided via the elastic thick film 10.
1, the input terminal 19 made of a metal plate spring and the input terminal 19 made of a metal plate spring are connected to the drive electrode 4, the power generation electrode 5 and the output terminal 12 made of the metal plate spring. Is fixed in the outer case 11.

The metal leaf spring and the elastic thick film 10 forming the output terminal 12 and the input terminal 19 absorb the generated mechanical vibration, so that the generation of vibration noise can be prevented, and a highly reliable piezoelectric transformer is provided. Parts can be provided.

(Embodiment 2) FIG. 2 is a sectional view of a piezoelectric transformer part according to a second embodiment of the present invention.
In FIG. 2, the drive electrodes 4 and 1 of the piezoelectric transformer main body 1 are shown.
The elastic thick film 10 is formed by printing an elastic Ag paste on the drive electrode 4 and the power generation electrode 5 on one surface of the power generation electrodes 5 and 18. The drive electrode 1 on the other surface
7. On the power generation electrode 18, a rubber elastic body 14 made of silicone rubber as a base and containing Ag as a conductive member was arranged. Then, through the elastic thick film 10 and the rubber elastic body 14,
The input terminal 16 and the drive electrodes 4, 1 arranged on the outer case 11
7, the output terminal 15 is connected to the power generation electrodes 5 and 18, and the piezoelectric transformer main body 1 is fixed in the outer case 11.

The elastic body thick film 10 and the rubber elastic body 14
Since the generated mechanical vibration is absorbed, generation of vibration noise can be prevented, and a highly reliable piezoelectric transformer component can be provided.

In the first embodiment and the second embodiment, the outer case 11 and the output terminals 12, 1
5 and the conductive portions of the input terminals 13, 16 and 19, and the thickness of the elastic thick film 1
The thickness variation can be reduced by the rubber elastic body 14 or zero.

Output terminals 12, 15 and input terminals 13,
Since the plates 16 and 19 are plate-shaped, there is no need to solder the lead wires as in the related art, and there is no disconnection due to mechanical fatigue and no electrode peeling at the soldered portion, and the size can be reduced.

[0017]

As described above, the piezoelectric transformer component of the present invention can prevent generation of audible frequency vibration sound.

[Brief description of the drawings]

FIG. 1 is a sectional view of a piezoelectric transformer component according to a first embodiment of the present invention.

FIG. 2 is a sectional view of a piezoelectric transformer component according to a second embodiment of the present invention.

FIG. 3 is a sectional view of a general Rosen secondary (λ mode) type piezoelectric transformer.

FIG. 4 is a perspective view of a conventional piezoelectric transformer main body.

FIG. 5 is a sectional view of a conventional piezoelectric transformer component.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Piezoelectric transformer main body 4 Drive electrode 5 Power generation electrode 10 Elastic body thick film 11 Outer case 12 Output terminal 13 Input terminal 14 Rubber elastic body 15 Output terminal 16 Input terminal 17 Drive electrode 18 Power generation electrode 19 Input terminal

Claims (2)

[Claims] 1. An outer case having two input terminals and one output terminal, and a Rosen-type piezoelectric transformer element housed in the outer case, wherein the Rosen-type piezoelectric transformer element is a rectangular piezoelectric transformer. One table on the body,
A drive electrode is provided on the back surface, a power generation electrode is provided on the other side, and a conductive elastic body is provided on the drive electrode and the power generation electrode surface, and the drive electrode and the input terminal, A piezoelectric transformer component in which a power generation electrode and the output terminal are electrically connected. 2. The piezoelectric transformer component according to claim 1, wherein at least one of the input terminals and the output terminal are formed of a metal leaf spring.