JP2005019786A - Structure for supporting piezoelectric transformer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a structure for supporting a piezoelectric transformer, which is superior in impact resistance characteristics and heat radiation characteristics, the degree of restraining vibration is small, and the cost is low. <P>SOLUTION: The piezoelectric transformer 8 is in a rectangular structure having an input electrode formed on the front and rear surfaces of nearly one half in the longitudinal direction and an output electrode formed on an end face at the opposite side. A support plate 1 has a claw 2 for clamping at least two places each on a side in the width direction of the piezoelectric transformer 8 and a locking section for fixing to a substrate to be mounted. The piezoelectric transformer is fixed to the substrate by fixing the locking section to the substrate. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a support structure for a piezoelectric transformer, and particularly to a support structure suitable for a large piezoelectric transformer having a large output.
[0002]
[Prior art]
[Patent Document 1] JP 2002-368300 [Patent Document 2] JP 2002-111091 [Patent Document 3] JP 2002 9360 A
Functional elements that use the natural vibrations of piezoelectric ceramics have the advantages of low loss, large electromechanical coupling coefficient, miniaturization, and excellent temperature coefficient and aging characteristics. is doing. Piezoelectric transformers, which are a kind of such functional elements, use the vibrations of elastic bodies, so that their stored energy is larger than electromagnetic transformers, they are nonflammable and excellent in safety, and magnetic shields There are features such as unnecessary. Inverters using piezoelectric transformers are widely used as power sources for cold cathode lamps.
[0004]
Most of the piezoelectric transformers that have been put to practical use so far are medium and small piezoelectric transformers within 5 W. Since there is little heat generation, a sealed or semi-sealed support structure in which a piezoelectric transformer is housed in a case is generally employed. In recent years, liquid crystal televisions and PC monitors have been increasing in size, and development of technology for simultaneously lighting a large number of external electrode type long lamps with a single transformer is progressing. In that case, high power and high discharge voltage are required, so application of a large piezoelectric transformer is expected. For example, when 10 external electrode fluorescent lamps are used in a 20-inch liquid crystal television, about 40 W of power and a discharge voltage of 13 kVpp are required.
[0005]
[Problems to be solved by the invention]
When a high power piezoelectric transformer of several tens of watts is used, the heat generated by the piezoelectric transformer becomes significant, and heat cannot easily be used in the conventional sealed / semi-sealed support structure. A support structure that is simple in structure and excellent in impact resistance is required. The present invention provides a support structure for a piezoelectric transformer that is excellent in impact resistance and heat dissipation characteristics, has a low degree of restraining vibration, and is low in cost.
[0006]
[Means for Solving the Problems]
This invention solves said subject by improving the structure of a support plate. That is, in the piezoelectric transformer support structure in which the piezoelectric transformer is fixed to the substrate via the support plate, the support plate has claws that sandwich at least two portions of the side surface in the width direction of the piezoelectric transformer and is attached to the substrate to be mounted. The piezoelectric transformer is fixed to the substrate by including an engaging portion for fixing and fixing the engaging portion to the substrate.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
The support structure of the piezoelectric transformer according to the present invention is as follows:
(1) A support plate made of metal or the like having claws for sandwiching the piezoelectric ceramic plate and having means for fixing to a substrate such as a hole,
(2) A substrate including a pin for screwing through a hole in the support plate is used as a constituent element. If necessary, an insulator is interposed in order to maintain insulation between the metal support plate and the electrode of the piezoelectric transformer, and the insulator is used as an elastic body, so that suppression of vibration of the piezoelectric transformer is minimized.
[0008]
【Example】
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an exploded perspective view showing an embodiment of the present invention, and only the support plate portion is shown in FIG. Four pawls 2 are formed on each side of the support plate 1 in the longitudinal direction. In this example, the support plate 1 is bent so that the claws 2 at both ends approach each other along the longitudinal center axis. The material of the support plate 1 is preferably a spring metal plate. In order for the claw 2 to support the piezoelectric transformer, it is necessary to shape the gap between the claws at both ends to be smaller than the width of the piezoelectric transformer, and it can be reliably supported when the piezoelectric transformer is fitted into the claw. Keep it like that.
[0009]
FIG. 1 is a perspective view showing an assembly structure of a piezoelectric transformer and a support plate. The both sides (end surfaces) in the width direction of the piezoelectric transformer 8 are sandwiched and fixed by the four claws 2 by utilizing the spring property of the bent portion 3 of the support plate 1. Since the input electrode of the piezoelectric transformer 8 and the claw 2 of the support plate 1 are in contact with each other, an elastic rubber 7 is interposed between the piezoelectric transformer (piezoelectric ceramic) 8 and the claw 2 in order to maintain insulation. In the example shown in FIG. 1, the opening type rubber tube 7 may be pushed into the support plate 1 after covering the edge of the piezoelectric transformer 8. As shown in FIG. 4, a simple structure in which the rubber tube is put on the nail can be adopted.
[0010]
The support plate 1 is fixed to the substrate by inserting a screw 4 through a hole formed at the end. The force with which the claw 2 grips the piezoelectric transformer 8 can be adjusted by the spring property and spring bending angle of the material of the support plate 1. If this force is sufficient, it is possible to prevent the piezoelectric transformer from dropping or moving. If it is not sufficient, it is necessary to further suppress the input / output direction of the piezoelectric transformer 8. As shown in FIG. 1, two pillars 5 fixed to a substrate 9 and a rubber tube 6 covering the pillars 5 are disposed at the tip of the input / output unit of the piezoelectric transformer 8. As a result, all directions of the piezoelectric transformer are supported, and a structure capable of sufficiently withstanding an impact is obtained. It is better to use plastic screws for the pillars 5 instead of metal. In particular, a high voltage is generated at the output end, so it is better to avoid metal materials.
[0011]
FIG. 3 is a perspective view showing a state after assembly, in which the electrodes of the piezoelectric transformer and the wiring pattern of the substrate are connected. Since this support structure has an open upper surface, it has superior heat dissipation characteristics compared to the conventional case-sealed type, and it is difficult for heat to accumulate. Therefore, the heat generated by the large piezoelectric transformer can be dissipated. Further, since rubber is interposed in the contact portion with the piezoelectric transformer, vibration suppression can be reduced and the impact resistance is greatly improved. The number of parts as a support structure is small, which is advantageous in terms of cost proposals.
[0012]
Although it is a large piezoelectric transformer, there is a problem of mechanical strength of the material, and since an operating frequency of a certain level or more is necessary, the size of the piezoelectric transformer has an upper limit. The liquid crystal panel is becoming larger and larger, and one large single plate transformer may not be able to handle power. This can be solved by connecting two or more piezoelectric transformers in parallel, but requires a lot of space. In order to save the area of the inverter unit, it is desirable that the inverter unit can be arranged in an overlapping manner. If the present invention is applied, a two-story structure can be obtained as shown in FIG. This example is realized by using the spacer 11.
[0013]
The present invention is not limited to the above example, and the shape of the support plate can be arbitrarily selected. The structure having the spring property is not limited to bending, and a curved shape can also be used. In addition, a resin or the like may be used for the insulator in contact with the piezoelectric transformer. The above support structure can be applied to most rectangular piezoelectric transformers. For example, a similar support structure may be used for a central input, both-end output type piezoelectric transformer.
[0014]
【The invention's effect】
According to the present invention, the following effects can be obtained.
(1) Since an open support structure is adopted, heat is less likely to be accumulated, and the problem of heat generation of a high-power piezoelectric transformer can be addressed.
(2) Since an elastic body can be interposed in the contact portion with the piezoelectric transformer, vibration suppression (restraint) can be kept small.
(3) With a simple support structure, the number of parts is small, and the cost can be reduced.
(4) Since the impact resistance in each direction can be improved, it becomes easy to support a large piezoelectric transformer having a particularly large mass.
(5) A plurality of piezoelectric transformers can be stacked and supported, and space can be saved.
[Brief description of the drawings]
1 is an exploded perspective view showing an embodiment of the present invention. FIG. 2 is a partial perspective view thereof. FIG. 3 is a perspective view showing an embodiment of the present invention. FIG. 4 is a partial perspective view showing another embodiment of the present invention. FIG. 5 is a perspective view showing an embodiment of the present invention.
1: Support plate 2: Claw 4: Fixing screw 5: Pillars 6, 7, 10: Rubber 8: Piezoelectric transformer

Claims (4)

In a piezoelectric transformer support structure in which a rectangular piezoelectric transformer is fixed to a substrate via a support plate,
The support plate includes a claw for sandwiching at least two portions of the side surface in the width direction of the piezoelectric transformer and a locking portion for fixing to the board to be mounted.
A piezoelectric transformer supporting structure, wherein the piezoelectric transformer is fixed to the substrate by fixing the engaging portion to the substrate. 2. The piezoelectric transformer support structure according to claim 1, wherein an insulating elastic body is disposed between the claw and the piezoelectric transformer. 2. The support structure for a piezoelectric transformer according to claim 1, wherein an end face in the length direction of the piezoelectric transformer is fixed by being pressed by a pin covered with an insulating elastic body. In a piezoelectric transformer support structure in which a plurality of rectangular piezoelectric transformers are fixed to a substrate via a support plate,
Each of the support plates includes a claw for sandwiching at least two portions of the side surface in the width direction of the piezoelectric transformer, and includes a locking portion for fixing to the board to be mounted,
A support structure for a piezoelectric transformer, wherein the engaging portions are overlapped via a spacer and fixed to the substrate, whereby the piezoelectric transformer is fixed to the substrate in an overlapped state.

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