JP2001244518A - Case of piezoelectric transformer element, casing method and piezoelectric transformer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To minimize vibration control in driving a piezoelectric transformer by fixing piezoelectric transformer elements and a case using only a small contact area. SOLUTION: A case 11 having an aperture surface at one main surface for insertion of piezoelectric transformer elements and a hole 11A for insertion of a spacer 12 at any two side surfaces opposing to four side surfaces which are almost perpendicular to the main surface is prepared, the spacer 12 is inserted into such a hole 11A and thereafter the relevant piezoelectric transformer elements are accommodated from the relevant aperture to place the piezoelectric material elements at the upper part of the inserted spacer 12. After the position as the node of vibration of the piezoelectric transformer elements opposing to the internal surface of the case 11 and the internal surface opposing to such position are fixed using a bonding agent, the space 12 is removed from the hole 11A.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for example, a case for accommodating a piezoelectric transformer element suitable for lighting a cold-cathode tube, a casing method for the case, and a piezoelectric transformer attached to the case by the casing method. The present invention relates to a piezoelectric transformer in which elements are housed.

[0002]

2. Description of the Related Art Conventionally, a cold cathode tube is generally used as a backlight of a liquid crystal panel mounted on an electronic device such as a notebook personal computer. This cold-cathode tube has a characteristic that a high voltage of about 1 kV is required at the start of lighting, but the required voltage during continuous light emission is reduced to about several hundred volts.

Since the load characteristics of the piezoelectric transformer element are suitable for lighting a cold cathode tube having the above-described characteristics, a piezoelectric transformer has recently been used as a power supply for the cold cathode tube. In this case, since a voltage of several hundred V to several kV is generated from the piezoelectric transformer element as described above, the piezoelectric transformer element is generally used in a state housed in a case in order to secure insulation from the outside. It is. In addition, handling by attaching to a case also facilitates mounting on a substrate.

As a piezoelectric transformer element, for example, a Rosen type piezoelectric transformer element 1 as shown in FIG. 10 is widely known in general, and one side half (input area) of a strip-shaped piezoelectric body is used. A structure having electrodes 2 to 4 on the end faces of the upper and lower sides and the opposite half (output area) is provided.

In a piezoelectric transformer element having such a structure, when an AC voltage having a predetermined resonance frequency determined according to the material and length of the element is applied between upper and lower electrodes of the input area, the applied voltage causes Resonates in the longitudinal direction, and a boosted AC voltage can be extracted from between one of the electrodes to which the input voltage is applied (GND common to the input side and the output side) and the end face electrode in the output area.

In the piezoelectric transformer element driven as described above, in the input area, electric energy is converted into mechanical energy by the applied voltage, and in the output area, mechanical energy is converted into electric energy. Since the conversion into energy is performed, the driving of the piezoelectric transformer element always involves mechanical vibration.

Therefore, in order to drive the piezoelectric transformer element in a state housed in the case so as not to suppress the vibration caused by the driving, the case and the piezoelectric transformer element are connected inside the case by the piezoelectric transformer. It is common to fix at a predetermined position that becomes a node of resonance of the element.

Further, if the piezoelectric transformer element in the housed state contacts the case even at a position other than the predetermined fixed position, the vibration at the time of driving by the applied voltage is hindered, which lowers the step-up efficiency and is unpleasant for humans. In some cases, an audible sound may be generated.

Therefore, when the piezoelectric transformer element is housed in the case, it is necessary to fix the piezoelectric transformer element inside the case so as not to come into contact at positions other than the above-mentioned predetermined positions. For example, as shown in FIG. When the piezoelectric transformer element 1 is fixed to the case 100 provided with the protrusion 101 at a position that is sometimes a node of resonance, an adhesive is applied to the protrusion 101 to house the piezoelectric transformer element 1, and the adhesive is A spacer is inserted into a gap between the inner surface of the case and the element so that the piezoelectric transformer element 1 is held at a predetermined position in the case until it is cured, and the spacer is removed after the adhesive is cured. Is common.

[0010] Also, Japanese Patent Publication No. 2923466 discloses that
There has been proposed a supporting device capable of holding a plate-shaped piezoelectric transformer element with a plurality of protrusions made of an elastic member at both end faces in the longitudinal direction of the element and positions serving as nodes of vibration in a housed state.

Japanese Unexamined Patent Application Publication No. 8-32135 proposes a piezoelectric transformer in which an open bottom surface inside a case and a position serving as a node of vibration of the piezoelectric transformer element are fixed with an adhesive having rubber elasticity. ing.

[0012]

According to the above-described conventional method, basically, since the fixed position between the piezoelectric transformer element and the case is a position that serves as a node of resonance, vibration is not greatly hindered. However, the fixed portion has a certain area because it has a width in the longitudinal direction and the lateral direction of the piezoelectric transformer element. For this reason, when driving at a frequency slightly different from the resonance frequency at the time of driving, or when driving at a frequency slightly deviated from the resonance point, vibration is suppressed even if the element is fixed at the node. Will be a factor.

Therefore, when the piezoelectric transformer element is fixed inside the case at a position serving as a node of resonance, from the viewpoint of realizing highly efficient vibration, the contact area between the element and the case,
The smaller the bonding area, the better.

Accordingly, the present invention provides a case and a casing method for a piezoelectric transformer element and a piezoelectric transformer which can minimize vibration suppression during driving by fixing the piezoelectric transformer element and the case with a small contact area. The purpose is to provide.

[0015]

In order to achieve the above object, a case of a piezoelectric transformer element according to the present invention has the following configuration.

That is, a case for accommodating a piezoelectric transformer element made of a flat-plate-shaped piezoelectric ceramic, having an opening surface for inserting the piezoelectric transformer element on one principal surface, and four main surfaces substantially perpendicular to the principal surface. Any two of the side surfaces facing each other have a hole into which a spacer can be inserted, or have an opening surface for inserting the piezoelectric transformer element on one main surface,
It is characterized in that it has a hole into which a spacer can be inserted on the other main surface facing the opening surface.

That is, using the case having the above structure, the piezoelectric transformer element is housed in the case in which the spacer is inserted, and in this state, the piezoelectric transformer element is bonded at a portion facing the inner side surface of the case. By fixing with an agent or the like, the piezoelectric transformer element and the case can be fixed with a small contact area, and vibration suppression during driving can be suppressed to a minimum.

To achieve the above object, a casing method for a piezoelectric transformer element according to the present invention has the following features.

That is, a casing method for accommodating a piezoelectric transformer element made of a flat plate-shaped piezoelectric ceramic in a case, wherein a spacer is formed in advance and an opening surface for inserting the piezoelectric transformer element is provided on one main surface, A case having a hole into which the spacer can be inserted is prepared in advance on any two side surfaces facing each other among the four side surfaces substantially perpendicular to the one main surface, or a spacer is prepared in advance and the one main surface is formed. Having an opening for inserting the piezoelectric transformer element, on the other main surface opposite to the opening, a case having a hole in which the spacer can be inserted is created in advance, and after inserting the spacer into the hole, By storing the piezoelectric transformer element from the opening surface, on the inserted spacer,
After placing the piezoelectric transformer element, a position serving as a node of vibration of the piezoelectric transformer element facing the inner surface of the case, and fixing the inner surface facing the position with an adhesive, It is characterized in that a spacer is extracted from the hole.

Thus, the piezoelectric transformer element and the case can be fixed with a small contact area, and the vibration during driving can be suppressed to a minimum.

In the above casing method, for example,
In the case where a case having an opening surface for inserting the piezoelectric transformer element on one main surface, and a hole having a hole on which the spacer can be inserted is formed on the other main surface facing the opening surface in advance, preferably, the case is formed. Is provided with two slit-shaped holes having a width in the short direction of the case, spaced apart in the longitudinal direction of the case as the holes, and the shape of the spacer is formed at both ends of a flat plate portion serving as a base. And the height of the edges is such that the piezoelectric transformer element housed in the case and the other main surface have a desired separation distance. It is good to form it.

[0022] More preferably, two protrusions are further provided on the top of the edge portion, the protrusions being separated by a distance substantially equal to the width of the piezoelectric transformer element in the lateral direction.

Thus, the piezoelectric transformer element can be easily stored at a predetermined position in the lateral direction of the case.

To achieve the above object, a piezoelectric transformer according to the present invention has the following configuration.

That is, a piezoelectric transformer in which a piezoelectric transformer element made of a plate-shaped piezoelectric ceramic is housed in a case, has an opening surface on one main surface, and has four side surfaces substantially perpendicular to the one main surface. In a case having a hole or a trace of closing the hole on any two side surfaces facing each other, a position serving as a node of vibration of the piezoelectric transformer element facing the inner surface of the case, With the opposed inner surface, the piezoelectric transformer element is fixed by an adhesive, or has an opening surface for inserting the piezoelectric transformer element on one main surface, and has an opening surface on the other main surface facing the opening surface. In a case having a hole into which a spacer can be inserted or a mark in which the hole is closed, a position which is a node of vibration of the piezoelectric transformer element which faces the inner surface of the case, and a position which faces the position. Inside surface By, wherein the piezoelectric transformer element is fixed by an adhesive.

Thus, the piezoelectric transformer element and the case can be fixed with a small contact area, and the vibration during driving can be suppressed to a minimum.

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings as an embodiment in which a Rosen-type piezoelectric transformer element, which is a typical piezoelectric transformer element, is housed.

In each of the embodiments described below, the piezoelectric transformer element 1 shown in FIG. 10 will be described as an example of the piezoelectric transformer element housed in the case. However, the present invention is not limited to this. As long as the shape of the piezoelectric transformer element uses resonance in the longitudinal direction, the piezoelectric transformer element can be widely applied to other Rosen type, center drive type, etc. piezoelectric transformer elements. Further, the present invention is not limited to the internal structure of a single-plate or stacked-type element, the shape of an electrode provided in a piezoelectric transformer element, and the driving mode at the time of driving.

[First Embodiment] First, a first embodiment will be described with reference to FIGS.

FIG. 1 is a perspective view showing the structure of a case according to the first embodiment and a spacer inserted into the case.

The case 11 for accommodating the piezoelectric transformer element according to the present embodiment has a box shape slightly larger than the piezoelectric transformer element to be accommodated therein, and is made of synthetic resin such as plastic.

As shown in the drawing, the case 11 has an opening on one main surface in the longitudinal direction, and two holes 11A are provided on two side surfaces in the case longitudinal direction substantially perpendicular to the opening surface. Have been. These holes 11A have such a size that the spacers 12 can be inserted, and the positions of the two opposing holes 11A provided on the two side surfaces in the case longitudinal direction are such that the inserted spacers 12 correspond to the case 11. The position of the case in the thickness (vertical) direction of the case depends on the height of the gap to be secured between the piezoelectric transformer element to be housed and the bottom surface of the case 11. Is determined in advance.

The position of the hole 11A in the longitudinal direction of the case is not particularly limited. However, it is possible to prevent the adhesive from adhering to the spacer 12, and to securely remove the spacer 12 from the hole 11A after the adhesive is cured. In order to enable extraction (the details will be described later), it is desirable to avoid a position corresponding to a position that becomes a resonance node when the piezoelectric transformer element to be housed is driven.

The spacer 12 shown in FIG. 1 has a cylindrical shape as an example, but is not limited to this shape. The cross-sectional shape of the spacer 12 in the lateral direction is a polygon such as a quadrangle. It may be. The shape of the hole 11A is not limited to a circular shape, but may be any shape as long as the cross-sectional shape of the spacer 12 can be inserted and does not cause large backlash.

<Storing Procedure of Piezoelectric Transformer Element in Case 11> Here, the procedure of storing (fixing) the piezoelectric transformer element in the case 11 will be described by taking as an example the case where the piezoelectric transformer element 1 shown in FIG. 10 is stored. I do.

(1) Four holes 11A provided in case 11
After inserting two spacers 12 as shown in FIG.
Case 11 with the two spacers 12 inserted
, The piezoelectric transformer element 1 is inserted. FIG. 2 shows a cross-sectional shape in the longitudinal direction of the case 11 and the piezoelectric transformer element 1 in this state.

(2) An elastic adhesive is poured between the side surface of the piezoelectric transformer element 1 housed in the case 11 in the step (1) and the side surface in the thickness (vertical) direction of the case. The position where the adhesive is poured is preferably a position that becomes a node of vibration during driving.

(3) After the poured elastic adhesive is cured, the spacer 12 is removed from the hole 11A. FIG. 3 shows a top view of the case 11 and the piezoelectric transformer element 1 in this state. Inside the case 11, the piezoelectric transformer element 1 is moved in the direction of the thickness (vertical) of the case, which becomes a node of vibration during driving. It can be fixed with only two sides.

(4) If necessary, cover the four holes 11A with an adhesive or the like. This step is not always necessary. That is, depending on the driving method of the piezoelectric transformer element, sound may be generated from the piezoelectric transformer element being driven,
In this case, if the four holes 11A are left open, sound leaks from those portions. Therefore, the hole 11A may be closed in this step only when sound leakage poses a problem.

In order to position the elastic adhesive and prevent the adhesive from flowing out, preferably, the case 11 is used.
It is good to provide a groove or a projection on the inner side surface of the.

According to the above-described embodiment, in the piezoelectric transformer element fixed inside the case 11 (hereinafter, the stored piezoelectric transformer element is referred to as “piezoelectric transformer”), the main surface of the piezoelectric transformer element is used. And the bottom surface of case 11 can be held in a non-contact state. As a result, the piezoelectric transformer element and the case can be fixed with a small contact area as compared with the conventional storage method, and vibration suppression during driving can be suppressed to a minimum. Furthermore,
The piezoelectric transformer element can be easily stored at a predetermined position in the case thickness (vertical) direction.

[Second Embodiment] Next, a second embodiment will be described with reference to FIG.

FIG. 4 is a perspective view showing the structure of a case according to the second embodiment and a spacer inserted into the case.

The case 21 for accommodating the piezoelectric transformer element according to the present embodiment has a box shape slightly larger than the piezoelectric transformer element to be accommodated therein, and is made of synthetic resin such as plastic.

As shown in the drawing, the case 21 has an opening on one main surface in the longitudinal direction, and two end surfaces of the case, which are substantially perpendicular to the opening surface, respectively have holes (slits) 21A.
Is provided. These holes 21A have a size that allows the insertion of the flat spacers 22. The positions of the two opposing holes 21A provided on the two end faces are such that the inserted spacers 22 It is formed so as to be substantially parallel to the side surface, and the formation position in the thickness (vertical) direction of the case depends on the height of the gap to be secured between the piezoelectric transformer element to be housed and the bottom surface of the case 21. It is determined in advance.

<Storing Procedure of Piezoelectric Transformer Element in Case 21> Here, the procedure of storing (fixing) the piezoelectric transformer element in the case 21 will be described by taking as an example the case where the piezoelectric transformer element 1 shown in FIG. 10 is stored. I do.

(1) Two holes 21A provided in case 21
4, the piezoelectric transformer element 1 is inserted from the opening surface of the case 21 in which the spacer 22 is inserted.

(2) An elastic adhesive is poured between the side surface of the piezoelectric transformer element 1 housed in the case 21 in the step (1) and the side surface in the thickness (vertical) direction of the case. The position where the adhesive is poured is preferably a position that becomes a node of vibration during driving.

(3) After the poured elastic adhesive is cured, the spacer 22 is removed from the hole 21A. The top view of the case 21 and the piezoelectric transformer element 1 in this state is
This is the same as FIG. 3 in the first embodiment, and the piezoelectric transformer element 1 can be fixed inside the case 21 only on two side surfaces in the case thickness (vertical) direction, which serve as nodes of vibration.

(4) Also in this embodiment, when sound leakage becomes a problem as in the first embodiment, two holes 2
1A is closed with an adhesive or the like.

In this embodiment, too, in order to position the elastic adhesive and prevent the adhesive from flowing out,
Preferably, a groove or a protrusion is provided on the inner surface of the case 21.

According to the above-described embodiment, in the piezoelectric transformer element fixed inside the case 21, the main surface of the piezoelectric transformer element and the bottom surface of the case 21 can be held in a non-contact state. As a result, similarly to the first embodiment, vibration suppression during driving can be minimized, and the piezoelectric transformer element can be easily stored in a predetermined position in the case thickness (vertical) direction. Can be.

[Third Embodiment] Next, a third embodiment will be described with reference to FIGS.

FIG. 5 is a perspective view showing the structure of a case according to the third embodiment and a spacer inserted into the case.

The case 31 for accommodating the piezoelectric transformer element according to the present embodiment has a box shape slightly larger than the piezoelectric transformer element to be accommodated therein, and is made of synthetic resin such as plastic.

As shown in the figure, the case 31 has an opening on one main surface in the longitudinal direction, and two holes (slits) 31A are provided on the bottom surface of the case substantially parallel to the opening surface. Have been. These holes 31A are large enough to insert the edges provided at both ends of the flat plate portion of the U-shaped spacer 32, and the height of the edges is determined by the piezoelectric transformer to be housed. It is determined in advance according to the height of the gap to be ensured between the element and the bottom surface of the case 31.

The position where the hole 31A is formed in the longitudinal direction of the case is not particularly limited. However, in order to reliably remove the spacer 32 from the hole 31A after the adhesive is cured, it is necessary to drive the piezoelectric transformer element to be housed. Sometimes it is desirable to avoid positions that correspond to positions that are nodes of resonance.

The spacer 32 shown in FIG. 5 has edges at both ends of a flat plate portion as a base as an example. However, the present invention is not limited to this shape, and the spacer 3 shown in FIG.
The shape may be such that a projection is provided in a square of the flat plate portion, such as 2 ′.

<Storing Procedure of Piezoelectric Transformer Element in Case 31> Here, the procedure of storing (fixing) the piezoelectric transformer element in the case 31 will be described with reference to the case where the piezoelectric transformer element 1 shown in FIG. 10 is stored as an example. I do.

(1) After inserting the spacer 32 (or spacer 32 ') into the two holes 31A provided on the bottom surface of the case 31, as shown in FIG. 5 (the piezoelectric transformer element 1, the case 31, and the spacer in this state) 7 is a cross-sectional view in the longitudinal direction of the piezoelectric transformer element 1).
Insert

(2) An elastic adhesive is poured between the side surface of the piezoelectric transformer element 1 housed in the case 31 in the step (1) and the side surface in the thickness (vertical) direction of the case. The position where the adhesive is poured is preferably a position that becomes a node of vibration during driving.

(3) After the poured elastic adhesive is cured, the spacer 32 is removed from the hole 31A. The top view of the case 31 and the piezoelectric transformer element 1 in this state is as follows.
This is the same as FIG. 3 in the first embodiment, and the piezoelectric transformer element 1 can be fixed inside the case 31 only at two sides in the case thickness (vertical) direction, which serve as nodes of vibration.

(4) Also in this embodiment, when sound leakage becomes a problem as in the first embodiment, two holes 3
1A is closed with an adhesive or the like.

In this embodiment, too, in order to position the elastic adhesive and prevent the adhesive from flowing out,
Preferably, a groove or a protrusion is provided on the inner surface of the case 31.

According to the above-described embodiment, in the piezoelectric transformer element fixed inside the case 31, the main surface of the piezoelectric transformer element and the bottom surface of the case 31 can be held in a non-contact state. As a result, similarly to the first embodiment, vibration suppression during driving can be minimized, and the piezoelectric transformer element can be easily stored in a predetermined position in the case thickness (vertical) direction.

<Modification of Third Embodiment> In this modification, the spacer 32 and the spacer 33 'based on the spacer 32' used in the third embodiment are used to form the piezoelectric transformer element in the longitudinal direction and in the longitudinal direction. Positioning in the short direction is also performed.

FIG. 8 is a perspective view of a spacer 33 inserted into the case 31 as a modification of the third embodiment. FIG. 9 is a cross-sectional view showing a state in which the piezoelectric transformer element 1 is mounted at a predetermined position of the spacer 33 inserted into the case 31, and corresponds to the position of the AA cross section in FIG.
In the case of this modification, the length of the spacer 33 in the longitudinal direction is slightly longer than the length of the piezoelectric transformer element 1 in the longitudinal direction).

As shown in FIG. 8 and FIG.
Are formed with edges at both ends of the flat plate, and edges (projections) 33A at both ends of the edges.
Are formed.

In this modification, the length of the spacer 33 in the longitudinal direction is slightly longer than the length of the piezoelectric transformer element 1, and the inner surfaces of the four edges 33A can hold the piezoelectric transformer element 1. It is formed in size.

The procedure for housing the piezoelectric transformer element 1 in the case 31 using the spacer 33 is basically the same as that in the third embodiment described above, except that the spacer 33 is removed from the hole 31A in the step (1). Case 31 in inserted state
When inserting the piezoelectric transformer element 1 from the opening surface of
As shown in FIG. 9, the element is fitted so as to fit between the protrusions of the spacer 33. Thus, the distance between the piezoelectric transformer element and the bottom of the case 31 and the case 31
The positioning of the (piezoelectric transformer element 1) in the short direction can be performed simultaneously, and the positioning in the long direction can be performed simultaneously.

<Modifications Common to First to Third Embodiments> According to the first to third embodiments described above, vibration suppression during driving is minimized and the case of the piezoelectric transformer element is reduced. Storage at a predetermined position in the thickness (up / down) direction can be easily performed. In this modification, a new one having the same outer shape as that of the spacer 32 or the spacer 32 ′ described in the third embodiment (but different in dimensions) is prepared, and the case is used by using the spacer. The positioning of the piezoelectric transformer element in the short direction or the long direction inside is also performed.

That is, the spacers newly prepared in the present modified example are designed such that when positioning the piezoelectric transformer element in the longitudinal direction inside the case, the distance between the edges provided at both ends of the spacer 32 is equal to the piezoelectric distance to be accommodated. It is formed in accordance with the length of the transformer element in the longitudinal direction, and the size of the edge is formed to be substantially the same as the size (width) of a predetermined gap between the inside of the case end face and the end face of the piezoelectric transformer element.

When positioning the piezoelectric transformer element in the lateral direction inside the case, the spacer 32 'is used.
The distance between the two projections provided at both ends of the piezoelectric transformer element is formed in accordance with the length (width) of the piezoelectric transformer element to be accommodated in the lateral direction, and the size of the projection is determined by the inner side of the case and the piezoelectric transformer element. Is formed to be substantially the same as the size (width) of the predetermined gap with the side surface.

As a method of using the above-mentioned spacer, prior to pouring the elastic adhesive in the step (2), the spacer may be put on the piezoelectric transformer element inside the case from the opening surface of the case in that state. good. Then, if the spacers are removed together with other spacers after the elastic adhesive is cured, positioning of the piezoelectric transformer element in the longitudinal direction or the lateral direction in the case can be easily performed.

It is easy to imagine that it is only necessary to use a combination of the two types of spacers described above in this modification in order to simultaneously perform the positioning in the longitudinal direction and the lateral direction. Detailed description is omitted.

[0076]

According to the present invention described above, the piezoelectric transformer element and the case can be fixed with a small contact area, and the vibration during driving can be suppressed to a minimum.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a structure of a case according to a first embodiment and a spacer inserted into the case.

FIG. 2 shows a spacer 1 in a case 11 according to the first embodiment.
FIG. 4 is a cross-sectional view showing a state when the piezoelectric transformer element 1 is stored via the second piezoelectric transformer element 2.

FIG. 3 is a top view showing a state where the piezoelectric transformer element 1 is fixed to the case 11 according to the first embodiment.

FIG. 4 is a perspective view showing a structure of a case according to a second embodiment and a spacer inserted into the case.

FIG. 5 is a perspective view showing a structure of a case according to a third embodiment and a spacer inserted into the case.

FIG. 6 shows a spacer 32 ′ usable in the third embodiment.
It is a perspective view which shows the external shape of.

FIG. 7 shows a case 31 according to a third embodiment,
FIG. 4 is a cross-sectional view showing a state when the piezoelectric transformer element 1 is stored via the second piezoelectric transformer element 2.

FIG. 8 is a perspective view of a spacer 33 inserted into a case 31 as a modification of the third embodiment.

FIG. 9 is a cross-sectional view showing a state where the piezoelectric transformer element 1 is placed at a predetermined position of a spacer 33 inserted into the case 31.

FIG. 10 is a perspective view showing a general Rosen-type piezoelectric transformer element.

FIG. 11 is a diagram illustrating a general method for storing a piezoelectric transformer element in a case.

[Explanation of symbols]

 1: piezoelectric transformer element, 2, 3, 4: external electrode, 11, 21, 31, 100: case, 11A, 21A, 31A: hole, 13: elastic adhesive, 12, 33, 32, 32 ', 33: Spacer, 33A: edge (projection),

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Takahiro Yamakawa 1-2-3 Kiyosumi, Koto-ku, Tokyo Inside Pacific Cement Co., Ltd. (72) Inventor Norifumi Iwaki 7-5 Harajuku, Hidaka City, Saitama Prefecture Megase Corporation La

Claims (9)

[Claims] 1. A case for accommodating a piezoelectric transformer element made of a flat plate-shaped piezoelectric ceramic, comprising an opening surface for inserting the piezoelectric transformer element on one main surface, and four main surfaces substantially perpendicular to the one main surface. A case for a piezoelectric transformer element, characterized in that a hole into which a spacer can be inserted is provided on any two opposing side surfaces among the side surfaces. 2. A case for accommodating a piezoelectric transformer element made of a flat plate-shaped piezoelectric ceramic, having an opening surface for inserting the piezoelectric transformer element on one main surface, and a second main surface facing the opening surface. A case for a piezoelectric transformer element having a hole into which a spacer can be inserted. 3. A casing method for accommodating a piezoelectric transformer element made of a flat plate-shaped piezoelectric ceramic in a case, comprising: a spacer previously formed; and an opening surface for inserting the piezoelectric transformer element on one principal surface; A case having a hole into which the spacer can be inserted is formed in advance on any two of the four side surfaces substantially perpendicular to the one main surface, and after inserting the spacer into the hole, the opening surface is formed. By storing the piezoelectric transformer element from above, the piezoelectric transformer element is mounted on the upper part of the inserted spacer, and a position serving as a node of vibration of the piezoelectric transformer element at a position facing the inner side surface of the case. And fixing the inner surface facing the position with an adhesive, and then extracting the spacer from the hole. 4. A casing method for accommodating a piezoelectric transformer element made of a flat plate-shaped piezoelectric ceramic in a case, wherein a spacer is prepared in advance, and an opening surface for inserting the piezoelectric transformer element on one main surface is provided. On the other main surface facing the opening surface, a case having a hole into which the spacer can be inserted is created in advance, and after inserting the spacer into the hole, the piezoelectric transformer element is stored from the opening surface. On the upper part of the inserted spacer, the piezoelectric transformer element is mounted, a position serving as a node of vibration of the piezoelectric transformer element facing the inner surface of the case, and the inner surface facing the position. And fixing the spacer with an adhesive, and then removing the spacer from the hole. 5. The case is provided with two slit-shaped holes having a width in the short direction of the case and spaced apart in the longitudinal direction of the case as the holes, and the shape of the spacer is In addition to forming a U-shape with edges formed at both ends of the flat plate portion serving as a base, the height of the edges is such that the piezoelectric transformer element housed in the case and the other main surface are 5. The casing method for a piezoelectric transformer element according to claim 4, wherein the casing is formed at a height at a desired separation distance. 6. The piezoelectric transformer element according to claim 5, further comprising: two protrusions separated from each other by a distance substantially equal to a width of the piezoelectric transformer element in a lateral direction at a top of the edge. Casing method. 7. The casing method for a piezoelectric transformer element according to claim 3, wherein the hole is closed after the spacer is removed. 8. A piezoelectric transformer in which a piezoelectric transformer element made of a flat-plate-shaped piezoelectric ceramic is housed in a case, the piezoelectric transformer having an opening surface on one main surface and four side surfaces substantially perpendicular to the one main surface. In a case having a hole or a trace of closing the hole on any two side surfaces facing each other, a position serving as a node of vibration of the piezoelectric transformer element facing the inner surface of the case, A piezoelectric transformer, wherein the piezoelectric transformer element is fixed with an adhesive by the opposed inner surface. 9. A piezoelectric transformer in which a piezoelectric transformer element made of a flat plate-shaped piezoelectric ceramic is housed in a case, and has an opening surface for inserting the piezoelectric transformer element on one principal surface, and is opposed to the opening surface. On the other main surface, in a case having a hole in which a spacer can be inserted or a mark in which the hole is closed, a position serving as a node of vibration of the piezoelectric transformer element facing the inner surface of the case, The piezoelectric transformer, wherein the piezoelectric transformer element is fixed by an adhesive with the inner surface facing the position.