JPS622476B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a high voltage generator that generates high voltage by applying an impact force to a piezoelectric element.

A high voltage generator using this type of piezoelectric element is
Widely used in gas lighters and other ignition devices.

FIG. 1 shows an example of a conventional high voltage generator.
In this figure, inside the main body case 1 made of insulating resin, there is a pad 2 that receives impact force, a piezoelectric element 3A,
3B is accommodated, and a metal washer 5 is screwed onto the end of the main body case 1 with the high voltage extraction electrode 4 inserted between the piezoelectric elements 3A and 3B. Here, the piezoelectric elements 3A and 3B have electrodes 6 on both end faces, and are in contact with the pad 2, the high voltage extraction electrode 4, and the metal washer 5, respectively, and are between the high voltage extraction electrode 4 and the metal washer 5. The piezoelectric elements 3A and 3B are electrically connected in parallel. An L-shaped cam hole 7 is formed in the main body case 1, and a high voltage lead wire 8 electrically connected to the high voltage extraction electrode 4 is fixed with adhesive.
An operating member 9 made of insulating resin is slidably attached to the inside of the main body case 1. The operating member 9 has a cam hole 10 and incorporates a hammer 11 and an impact spring 12 as an impact mechanism that applies an impact force to the pad 2. In addition, the main case 1
A return spring 13 is provided inside, which urges the operating member 9 in the protruding direction (rightward).

In the above configuration, in the normal state, the operating member 9 is biased in the protruding direction, and the hammer pin 14 is engaged with the lower end of the L-shaped cam hole. In this state, when the operating member 9 is pressed in the direction of arrow A against the elastic force of the return spring 13, the elastic force is accumulated in the impact spring 12 within the operating member 9. When the operating member 9 is further pressed, the hammer pin 14 is pushed up by the inclined side B of the cam hole 10, the engagement between the hammer pin 14 and the L-shaped cam hole 7 is disengaged, and the hammer 11 suddenly moves to the left and is pressed. The metal 2 is struck hard to generate a high voltage between the high voltage lead wire 8 and the metal washer 5.

By the way, in the conventional high voltage generator as described above, the polarization directions P and Q of the piezoelectric elements 3A and 3B are parallel to the direction of the mechanical impact force F, but in this case, the electromechanical conversion efficiency is not necessarily good. Therefore, a large impact force F is required to obtain a sufficient high pressure output.

In view of the above points, the present invention aims to provide a high voltage generator that improves conversion efficiency and, by extension, increases high voltage output by tilting the polarization direction of a piezoelectric element with respect to the direction of mechanical force. It is something.

Embodiments of the high voltage generator according to the present invention will be described below with reference to the drawings.

In FIG. 2, the piezoelectric elements 3C and 3D are formed to have polarization directions R and S inclined with respect to their axial directions, and are adapted to receive an impact force F from the hammer 11 in the axial direction. The other configurations of the main body case 1, the operating member 9, the built-in impact mechanism, etc. are the same as those shown in FIG.

In the above embodiment, when the operating member 9 is pressed in the direction of the arrow A, the hammer pin 14 disengages from the L-shaped cam hole 7 as described above, and the hammer 11 suddenly moves to the left and hits the pad 2. and piezoelectric element 3C,
An impact force F is applied to 3D, generating a high voltage between the high voltage lead wire 8 and the metal washer 5. in this case,
Since the impact force F is applied obliquely to the polarization directions R and S of the piezoelectric elements 3C and 3D, the conversion efficiency can be improved compared to the conventional method.

For example, when the operating force of the impact mechanism is 2 kg, the stroke is 2.5 mm, and a conventional piezoelectric element whose polarization direction matches the axial direction and is 3 mm in diameter and 5 mm in length is used, the high voltage output is 15 kV. However, by setting the polarization direction of the piezoelectric element to form a certain angle with respect to the axial direction as in the above embodiment, the high voltage output can be increased to 15 kV or more as shown in FIG. 3. In particular, the angle between the polarization direction and the axial direction is
The maximum value of 17kV is obtained at 45°, and at 30° and 60
In the case of ゜, it became 16.5kV. Therefore, by setting the polarization direction of the piezoelectric element within the range of approximately 30° to 60°, it is possible to achieve a sufficient effect of improving the output.

Note that the present invention is applicable to high voltage generators having various mechanical structures, and is not limited to the structure shown in FIG. 2.

As described above, according to the present invention, there is obtained a high voltage generator in which the polarization direction of the piezoelectric element is inclined with respect to the direction of mechanical force, thereby making it possible to increase the high voltage output.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an example of a conventional high voltage generator, FIG. 2 is a longitudinal sectional view showing an embodiment of the high voltage generator according to the present invention, and FIG. 3 explains the effects of the embodiment. This is a graph for 1...Body case, 2...Ball, 3A to 3
D... Piezoelectric element, 4... High voltage extraction electrode, 5... Metal washer, 6... Electrode, 7... L-shaped cam hole, 8...
High voltage lead wire, 9... Operating member, 10... Cam hole, 11... Hammer, 12... Impact spring, 13...
...Return spring.

Claims (1)

[Claims] 1. A high voltage generator comprising a piezoelectric element and an impact mechanism that applies a mechanical force to the piezoelectric element, wherein the mechanical force is applied in a direction inclined with respect to the polarization direction of the piezoelectric element. A high voltage generator characterized by: 2. Claim 1, wherein the polarization direction and the mechanical force direction form an angle of approximately 30° to 60°.
The high voltage generator described in Section 1.