JP2923466B2 - Supporting device for piezoelectric transformer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a piezoelectric transformer as a voltage converter using a piezoelectric element, and more particularly to a piezoelectric transformer supporting device.

[0002]

2. Description of the Related Art A piezoelectric transformer generates mechanical vibration in a longitudinal direction by applying an input voltage to a vibrating section, and converts the mechanical vibration into a voltage in a power generating section and outputs the voltage. This has the advantage that it is thinner and smaller than a wound transformer. Examples of conventional piezoelectric transformers include JP-A-5-21858, JP-A-6-334234, JP-A-6-334235, and JP-A-6-34.
2945 gazette.

[0003] Since a piezoelectric transformer involves mechanical vibration, it cannot be put to practical use by itself, and some kind of supporting device is required. As a conventional piezoelectric transformer support structure, as shown in FIGS. 17A and 17B,
A structure is employed in which the piezoelectric transformer main body is fixed to a printed wiring board. That is, as shown in FIGS. 17A and 17B, the mounting opening 106 is formed in the rectangular substrate 100.
Are formed, and supporting projections 102, 103, 104, and 105 are provided on the inner wall surface of the mounting opening 106 in the width direction X so as to correspond to the vibration nodes P1 and P2 of the piezoelectric transformer 101. The configuration is such that holders 110 and 111 are laid horizontally on the mounting openings 106 at the portions corresponding to the nodes P1 and P2. These support projections 102, 103, 104,
The piezoelectric transformer 101 is sandwiched between sides 105 and the piezoelectric transformer 101 is held by holders 110 and 111.
It is held and supported by the upper and lower side surfaces of the.

As described above, the support projections 102, 103, 1
The support suitable for the vibration mode of the piezoelectric transformer 101 was made possible by supporting the vibrating nodes P1 and P2 with the use of the holders 04 and 105 and the holders 110 and 111. As an example of a conventional piezoelectric transformer support structure,
JP-A-7-202288, JP-A-7-20228
No. 9 and the like.

[0005]

However, the vibration frequency of the piezoelectric transformer 101 may change with changes in input conditions (drive voltage or the like), output conditions (load or the like), or environmental conditions such as temperature changes. . A change in the vibration frequency causes a change in the physical position of the vibration nodes P1 and P2,
Support projections 102, 103, 104, 105 initially set
In addition, there is a problem that the positions are not matched at the positions of the holders 110 and 111, and the required performance cannot be obtained by suppressing the vibration.

When the drive voltage (input voltage) is increased to obtain a high output voltage, the piezoelectric transformer 101
Vibrates more than the allowable value and the vibration amplitude increases. In this case, the conventional method in which the holders 110 and 111 firmly support the upper and lower sides of the piezoelectric transformer 101 to support the piezoelectric transformer 101 damages the piezoelectric transformer 101. Have a point. SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and a piezoelectric transformer supporting device capable of supporting a vibrating node portion with an appropriate degree of freedom in response to a change in frequency or a change in drive voltage. The purpose is to provide.

[0007]

[0008]

Means for Solving the Problems According to the first aspect of the present invention, the plate-shaped piezoelectric transformer has a size capable of accommodating the piezoelectric transformer with a gap around the width direction and the longitudinal direction thereof, A substrate having a mounting opening provided with a width-direction support protrusion abutting on the width-direction end surface of the piezoelectric transformer and a longitudinal direction support protrusion abutting on the longitudinal direction end surface; and a piezoelectric transformer housed in the mounting opening. And a support member having a node support protrusion made of an elastic material that comes into contact with the vibrating node.

According to the first aspect of the present invention, the width direction and the length direction of the piezoelectric transformer are supported by the width direction support projection and the length direction support projection provided in the mounting opening of the substrate. Supports the vibrating node of the piezoelectric transformer by an elastic node supporting projection provided on a separate supporting member. Since the vibrating nodes of the piezoelectric transformer are supported by the elastic node supporting protrusions as described above, the vibrating nodes can be supported with an appropriate degree of freedom without restraining the vibrating nodes in a fixed manner to suppress vibration. it can. As a result, it is possible to adapt to an increase in vibration amplitude at the time of high output, and it is possible to prevent breakage of the piezoelectric transformer. Further, the piezoelectric element can be properly supported without suppressing vibration even when the vibration node position changes due to the fluctuation of the vibration wave number due to a change in environmental conditions or the like.

[0010] The invention according to claim 2 provides a substrate having a mounting opening capable of accommodating the piezoelectric transformer with a gap around the width and the length of the plate-shaped piezoelectric transformer. The piezoelectric transformer accommodated in the mounting opening is formed of a width-direction support projection that abuts a width-direction end face of the piezoelectric transformer, a longitudinal direction support projection that abuts a longitudinal-direction end face, and an elastic material that abuts a vibration node of the piezoelectric transformer. And a supporting member having a node supporting protrusion.

According to the second aspect of the present invention, a configuration is employed in which the piezoelectric transformer is supported by the support member in the mounting opening of the substrate. That is, the mounting opening acts as a storage space, and the piezoelectric transformer is supported by the support member, and the support member is fixed to and integrated with the substrate. In the piezoelectric transformer, the width direction and the longitudinal direction of the piezoelectric transformer are elastically supported by the width direction support projection and the length direction support projection provided on the support member, and the vibration nodes are elastically supported by the node support projections. Supported by As described above, since the piezoelectric transformer is elastically supported as a whole, not only at the vibrating nodes, the piezoelectric transformer can be supported with an appropriate degree of freedom without restraining the vibrating nodes in a fixed manner to suppress vibration. . As a result, it is possible to adapt to an increase in vibration amplitude at the time of high output, and it is possible to prevent breakage of the piezoelectric transformer. Further, the piezoelectric element can be properly supported without suppressing vibration even when the vibration node position changes due to the fluctuation of the vibration wave number due to a change in environmental conditions or the like.

[0012] According to a third aspect of the invention, the piezoelectric transformer of the supporting device according to claim 2, wherein the supporting member is a thin plate material having flexibility and elasticity, the width direction supporting projection, the longitudinal direction The support protrusion and the node support protrusion are formed by protruding pieces formed by cutting and raising respective corresponding positions on the thin plate. According to the invention described in claim 3 ,
Since each of the support projections can be formed by cutting and raising, the width direction support projection, the longitudinal direction support projection, and the node support projection can be easily formed in addition to the operation according to the second aspect of the present invention. Therefore, it is possible to adjust the supporting strength and the added amount of elasticity, and it is possible to reduce the weight due to the cutout and the cutting.

According to a fourth aspect of the present invention, in the piezoelectric transformer supporting device according to the third aspect, each end of the width direction supporting projection, the longitudinal direction supporting projection, and the node supporting projection is disposed in a thickness direction. It is configured to be bent. According to the fourth aspect of the present invention, since each tip of each support projection is formed by bending in the thickness direction, in addition to the effects of the inventions of the second and third aspects, the width direction support is provided. It is possible to adjust the support strength and the additional amount of elasticity of the protrusion, the longitudinal direction support protrusion, and the node support protrusion.

[0014] The invention according to claim 5, in the piezoelectric transformer of the supporting device according to claim 2, wherein the supporting member is a thin plate material having flexibility and elasticity, the width direction supporting projection, the longitudinal direction The support protrusion and the node support protrusion are formed by forming protrusions formed by pressing at corresponding positions on the thin plate. According to the fifth aspect of the present invention, since each support protrusion is formed by press working, the width-direction support protrusion, the longitudinal-direction support protrusion, and the node-portion support protrusion are easily formed, and the piezoelectric transformer is formed. It is possible to adjust the supporting strength and the amount of added elasticity for properly supporting the vibrating node portion without excessive suppression.

According to a sixth aspect of the present invention, there is provided a board provided with a mounting opening for accommodating the piezoelectric transformer with a gap around the width and the length of the plate-shaped piezoelectric transformer; A width direction support projection that contacts the width direction end face of the piezoelectric transformer housed in the opening, a longitudinal direction support projection that contacts the longitudinal direction end face, and a node made of an elastic material that contacts the vibration node of the piezoelectric transformer. And a supporting member having a portion supporting protrusion, the node supporting protrusion located at one of the vibration nodes of the piezoelectric transformer abuts on the one vibration node, and The node supporting protrusion located on the other side is configured to support the vibration node in a loosely fitted state with a gap between the node supporting projection and the other vibration node. According to the sixth aspect of the present invention, the node supporting projection located on the other of the vibrating nodes of the piezoelectric transformer has a gap between the other vibrating nodes and the vibrating nodes in a loose fit state. Since the portion is supported, the vibrating node portion can be properly supported in a more free state without excessive suppression.

According to a seventh aspect of the present invention, there is provided a substrate provided with a mounting opening for accommodating the piezoelectric transformer with a gap around the width and the length of the plate-shaped piezoelectric transformer, and A width support protrusion provided at a position facing the width end face of the piezoelectric transformer housed in the opening, a longitudinal support protrusion provided at a position facing the longitudinal end face,
A supporting member having a node supporting projection made of an elastic material provided at a position corresponding to the vibration node of the piezoelectric transformer, wherein the width direction supporting projection contacts an end face in the width direction of the piezoelectric transformer. The longitudinal supporting protrusion is in contact with the longitudinal end surface of the piezoelectric transformer, and is configured to support the piezoelectric transformer in a loose fit state with a gap therebetween. According to the seventh aspect of the present invention, since the longitudinal supporting protrusion has a gap between the longitudinal direction end face of the piezoelectric transformer and the loosely fitted state, and supports the piezoelectric transformer in a loose fit state, the thickness of the piezoelectric transformer is increased. The degree of freedom is given not only in the longitudinal direction but also in the longitudinal direction, so that the vibrating node can be properly supported without excessively suppressing.

According to an eighth aspect of the present invention, the support member according to the third aspect and the support member according to the fourth aspect are combined. That is, a substrate provided with a mounting opening capable of housing the piezoelectric transformer with a gap around the width and the longitudinal direction of the plate-shaped piezoelectric transformer, and a width of the piezoelectric transformer stored in the mounting opening. Width-direction support protrusion provided at a position facing the direction end face, a longitudinal direction support protrusion provided at a position facing the longitudinal direction end face, and a position corresponding to a vibration node of the piezoelectric transformer. A supporting member having a plurality of node supporting protrusions made of an elastic material,
The width-direction support protrusion abuts on the width-direction end face of the piezoelectric transformer, and the longitudinal direction support protrusion supports the piezoelectric transformer in a loose fit state with a gap between the width-direction end face of the piezoelectric transformer. Then, the node supporting protrusion located at one of the vibration nodes of the piezoelectric transformer abuts on the one vibration node,
The node supporting projection located on the other of the vibrating nodes of the piezoelectric transformer is configured to support the vibrating node in a loosely fitted state with a gap between the vibrating node and the other vibrating node. According to the eighth aspect of the present invention, since the longitudinal supporting projection has a gap between the longitudinal supporting end and the longitudinal end face of the piezoelectric transformer and supports the piezoelectric transformer in a loosely fitted state, it is also free in the longitudinal direction. Since the nodal support projection located at the other vibrating node supports the vibrating node in a loosely fitted state with a gap between the other vibrating node, the vibrating node The portion can be properly supported without excessively suppressing the portion.

[0018]

Next, preferred embodiments of the present invention will be described with reference to the drawings. (I) First Embodiment FIGS. 1A to 2B show a first embodiment of the present invention. This embodiment discloses an example of a structure in which an end face in the width direction and an end face in the longitudinal direction of the piezoelectric transformer 2 are supported on the substrate 1 side, and the vibrating nodes in the thickness direction are supported by the thin plates 3 and 4.

As shown in FIG. 1A, a mounting opening 11 is provided in a substrate 1 such as a printed wiring board. The mounting opening 11 is formed with a large dimension so as to provide an appropriate gap in the width direction and the longitudinal direction of the piezoelectric transformer 2. A pair of semi-cylindrical width-direction support projections 7 and 8 and 9 and 10 project from the inner wall surface of the attachment opening 11 in the width direction.
Similarly, a pair of semi-cylindrical longitudinal supporting projections 5 and 6 are provided on the inner wall surface in the longitudinal direction of the mounting opening 11.

Each of the width-direction supporting projections 7, 8, 9, and 10 is a vibration node (FIG. 17A, P
1, and P2) (or a position in the vicinity thereof), and the ends thereof are connected to the piezoelectric transformer 2.
Are in line contact with the end faces of In addition, the width direction support projections 7 to 10 may be formed in a projection shape, and the tips may be brought into point contact. The piezoelectric transformer 2 is accommodated in the mounting opening 11 of the substrate 1 while being supported by these width-direction supporting projections 7 to 10. The longitudinal support protrusions 5 and 6 are provided at or near the center in the width direction of the piezoelectric transformer 2, and their tips abut the respective longitudinal end surfaces of the piezoelectric transformer 2 by line contact. The longitudinal direction support projections 5 and 6 may be formed in a projection shape, and the tips may be brought into point contact.

As shown in FIGS. 1B and 2B, the piezoelectric transformer 2 is sandwiched between a pair of thin plates 3 and 4 made of a thin plate having flexibility and elasticity. . The thin plate 3 has a size to cover the mounting opening 11, and the thin plate 3 has a half that protrudes toward the piezoelectric transformer 2 so as to come into contact with a vibration node position (or a position in the vicinity thereof) on one surface of the piezoelectric transformer 2. Cylindrical node support projections 12 and 13
Are formed. Similarly, the thin plate 4 has a size to cover the mounting opening 11, and the thin plate 4 protrudes toward the piezoelectric transformer 2 so as to come into contact with a vibration node position (or a position in the vicinity thereof) on the other surface of the piezoelectric transformer 2. Semi-cylindrical node support protrusions 14 and 15 are formed.

For the thin plates 3 and 4, specifically, a polyimide resin film, a polyester resin film, a polycarbonate resin film, a polyester film composite polyphenylene sulfide resin film, aramid paper, etc. can be used. Although it is preferable to have a property, a composite material in which an insulating material and another material are combined can be used. This applies to a thin plate described later. Each node support projection 12-15
Although the tips are in contact with the respective end faces of the piezoelectric transformer 2 by line contact, the node support projections 12 to 15 may be formed in a protruding shape and the tips may be brought into point contact.

Positioning support projections 16, 17, 18, and 19 are formed at longitudinal ends of the mounting opening 11, and
Are respectively fitted in positioning holes 20 and 21 provided at corresponding positions. The above-mentioned joint supporting projections 12, 1
3, 14, 15, positioning support protrusions 16, 17, 18,
19 is formed by, for example, pressing the thin plates 3 and 4. Other processing methods include thin plates 3 and 4
In the case where a resin material is used, injection molding using a mold can be used. In assembling, the thin plates 3 and 4 are integrated with an adhesive or a double-sided tape.

In the above construction, the joint supporting projections 12,
Since the vibration nodes 13, 14, and 15 have elasticity, the vibration nodes are supported by a flexible structure (or a soft structure), and are flexible even when the vibration node positions fluctuate due to fluctuations in the vibration frequency or when the vibration amplitude increases. Can be supported,
Vibration nodes can be restrained to suppress vibration forcibly and prevent the piezoelectric transformer 2 from being broken.

(II) Second Embodiment FIGS. 3A to 4B show a second embodiment of the present invention. This embodiment discloses a structural example in which the substrate 1 is used as a storage container and the piezoelectric transformer 2 is supported by the thin plates 3 and 4. As shown in FIG.
The substrate 1 is provided with a mounting opening 11 having a relatively large size so as to provide an appropriate gap in the width and longitudinal directions of the piezoelectric transformer 2. As shown in FIGS. 3 (B) to 4 (B),
The piezoelectric transformer 2 is sandwiched on a sandwich by a pair of thin plates 3 and 4 having a thin shape having flexibility and elasticity.

The thin plate 3 has a size to cover the mounting opening 11, and the piezoelectric transformer 2 is positioned so that the tip of the thin plate 3 comes into contact with a vibration node position (or a position in the vicinity thereof) on one surface of the piezoelectric transformer 2. Semi-cylindrical node support projection 12 projecting to the side
And 13 are formed, and their ends are in contact with the surface of the piezoelectric transformer 2 by line contact (or point contact).
The thin plate 3 is provided with a pair of width-direction support projections 24, 25, 26, and 27 that abut on the width-direction end surface of the piezoelectric transformer 2 at the vibration node position (or in the vicinity thereof). The end face is in contact with the widthwise end face of the piezoelectric transformer 2 by line contact (or point contact).

Further, the thin plate 3 has a pair of longitudinal supporting projections 22 and 23 abutting on the longitudinal end surface of the piezoelectric transformer 2.
Are provided, and their side end surfaces are in contact with the longitudinal end surfaces of the piezoelectric transformer 2 by line contact (or point contact). Similarly, the thin plate 4 is formed symmetrically with the thin plate 3,
Knot support protrusions 14, 15, positioning support protrusions 18, 1
9. It has longitudinal support projections 28, 29, 30, 31. Positioning support protrusions 16 and 17 and positioning support protrusions 18 and 19 are formed at the longitudinal end of the mounting opening 11, and positioning holes 2 provided at corresponding positions on the substrate 1.
0 and 21 respectively.

The above-mentioned joint supporting projections 12, 13, 14, 1
5, positioning support protrusions 16, 17, 18, 19, longitudinal support protrusions 22, 23, 28, 29, width support protrusion 3
0 and 31 are formed by, for example, pressing the thin plates 3 and 4. Other processing methods include thin plate 3
When a resin material is used for (4) and (4), injection molding using a mold can be used. When assembling, the thin plates 3 and 4
Are integrated by bonding such as an adhesive or a double-sided tape or welding such as heating.

In the above configuration, the joint supporting projections 12,
13, 14, 15, the longitudinal support protrusions 22, 23, the width support protrusions 24, 25, 26, 27, 30, 31, and the longitudinal support protrusions 28, 29 have elasticity, so that the vibrating node portion Is supported by a flexible structure (or soft structure) in the thickness and width directions, and also in the longitudinal direction, so that it can flexibly change the position of the vibrating nodes due to fluctuations in the vibration frequency or increase the vibration amplitude. The vibrator can be supported, and the vibration node portion can be restrained to suppress the vibration forcibly or to prevent the piezoelectric transformer 2 from being broken.

(III) Third Embodiment FIGS. 5A to 6B show a third embodiment of the present invention. This embodiment discloses an example in which the substrate 1 is used as a storage container and the piezoelectric transformer 2 is supported by the thin plates 3 and 4, and one of the vibrating nodes and the longitudinal direction are supported by a more flexible structure. .

Since the basic structure is the same as that of the second embodiment (FIGS. 3A to 4B), only different parts will be described below, and other parts will be described above. Invite. That is, in this embodiment, a gap 3 is provided between the tips of the node supporting projections 13A and 15A of the thin plate 3 supporting one of the vibration nodes and the surface of the piezoelectric transformer 2.
Nodal support projections 13A and 15A are formed so as to lay down 4, 4 and 35, and longitudinal support projections 22, 28 and 2 are provided.
3 and 29 are formed so as to leave gaps 32 and 33 between the piezoelectric transformer 2 and the longitudinal end surface thereof. Appropriate lengths of the gaps 32 and 33 are set by experimentally and empirically obtaining possible fluctuations in vibration frequency and vibration amplitude.

As described above, since one of the vibrating nodes and the longitudinal direction are supported by a more flexible structure, the vibrating nodes can be flexibly supported even when the position of the vibrating nodes changes due to the fluctuation of the vibration frequency or when the vibration amplitude increases. Vibration nodes can be restrained to suppress vibration forcibly and prevent the piezoelectric transformer 2 from being broken. That is, even if the vibrating node is set in advance as a position corresponding thereto, the position may be different from the previously set position depending on the ratio of the thickness, width, length, and the like of the piezoelectric transformer 2. Even in such a case, the piezoelectric transformer 2 can be freely supported at a predetermined vibration amplitude without suppressing the vibration of the piezoelectric transformer 2 itself.
The piezoelectric transformer 2 is formed such that gaps 32, 33, 34, and 35 are provided between the longitudinal support protrusions 22, 28, 23, and 29 and the piezoelectric transformer 2, respectively. The nodal supporting projections 12, 1 in which the positions of the true vibrating nodes 2 are arranged without forming a gap.
4 to be naturally moved to be supported.

(IV) Fourth Embodiment FIGS. 7A to 8B show a fourth embodiment of the present invention. This embodiment discloses an example in which, in a structure in which a substrate 1 is used as a storage container and a piezoelectric transformer 2 is supported by thin plates 3 and 4, each support protrusion is supported by a notch protrusion. As shown in FIG. 7A, a large-sized mounting opening 11 is formed in the substrate 1 so as to provide an appropriate gap in the width direction and the longitudinal direction of the piezoelectric transformer 2. As shown in FIGS. 7B to 8B, the piezoelectric transformer 2 is sandwiched on a sandwich by a pair of thin plates 3 and 4 having a thin shape having flexibility and elasticity. The thin plate 3 has a size to cover the mounting opening 11, and projects toward the piezoelectric transformer 2 so that the tip of the thin plate 3 comes into contact with a vibration node position (or a position in the vicinity thereof) on one surface of the piezoelectric transformer 2. The node supporting protrusions 42 and 43 are formed, and their ends are in contact with the surface of the piezoelectric transformer 2 by line contact (or point contact).

The thin plate 3 has a pair of hook-shaped width-direction supporting projections 38, 39, 4 which come into contact with the width-direction end surfaces of the piezoelectric transformer 2 at (or near) the vibration node position.
0 and 41 are provided, and their side end faces are in contact with the width direction end faces of the piezoelectric transformer 2 by line contact (or point contact). Further, the thin plate 3 is provided with a pair of longitudinal supporting projections 36 and 37 which are in contact with the longitudinal end surfaces of the piezoelectric transformer 2, and their side end surfaces are in line contact with the longitudinal end surfaces of the piezoelectric transformer 2 (or point contact). Contact).

On the other hand, the thin plate 4 has a size to cover the mounting opening 11, and the piezoelectric transformer is so arranged that the tip of the thin plate 4 abuts on the vibrating node position (or near position) on the other surface of the piezoelectric transformer 2. Knot supporting projections 44, 45 projecting to the two sides
Are formed, and their ends are in contact with the surface of the piezoelectric transformer 2 by line contact (or point contact). Positioning support projections 16 and 1 are provided at the longitudinal end of the mounting opening 11.
7, 18 and 19 are formed, and are fitted into positioning holes 20 and 21 provided at corresponding positions on the substrate 1, respectively.

The above-described longitudinal support protrusions 36 and 37, width-direction support protrusions 38, 39, 40 and 41, and node support protrusion 4
2, 43, 44 and 45 are formed by punching and bending the thin plates 3 and 4. As another molding method, when a resin material is used for the thin plates 3 and 4, injection molding using a mold can be used. In assembling, the thin plates 3 and 4 are integrated with an adhesive or a double-sided tape.

In the above configuration, the longitudinal support projection 3
6, 37, the width direction supporting projections 38, 39, 40, 41, and the node portion supporting projections 42, 43, 44, 45 have elasticity, so that the vibrating nodes are flexible in the thickness direction, the width direction and the longitudinal direction. It is supported by a structure (or soft structure), and can be flexibly supported even when the vibration node position fluctuates or the vibration amplitude increases due to the fluctuation of the vibration frequency. It is possible to prevent the piezoelectric transformer 2 from being forcibly suppressed or the piezoelectric transformer 2 from being broken. In addition, the longitudinal supporting protrusions 36 and 37, the width supporting protrusion 3
8, 39, 40, 41, knot supporting projections 42, 43, 4
Since punching and bending can be employed in the formation of 4, 45, the production efficiency can be improved, the cost can be reduced, and the weight can be reduced.

(V) Fifth Embodiment FIGS. 9A to 10B show a fifth embodiment of the present invention. This embodiment discloses a modification in which each supporting projection is supported by a notch in a structure in which the substrate 1 is used as a storage container and the piezoelectric transformer 2 is supported by the thin plates 3 and 4. . Since the basic structure is the same as that of the fourth embodiment (FIGS. 7A to 8B), only different parts will be described below, and the other parts will be described above.

That is, in this embodiment, the longitudinal supporting projections 36A, 37A, the width supporting projections 38A, 38A,
9A, 40A, 41A, joint supporting projections 42A, 43A,
The respective tips of 44A and 45A are bent and raised at a predetermined angle with respect to their extending direction. The bending direction of the longitudinal supporting projections 36A, 37A may be configured to project in the opposite direction to the mode shown in FIG. 10A or to project in a loop. As a result, the longitudinal direction supporting protrusions 36A, 37A, the node portion supporting protrusions 42A, 43A,
Since the contact portions of the 4A and 45A with the piezoelectric transformer 2 are curved, the contact is gentle, and even if the position of the vibration node changes, it is possible to flexibly support a slight displacement. . Other operations are the same as those of the fourth embodiment.

(VI) Sixth Embodiment FIG. 11 shows a sixth embodiment of the present invention. This embodiment discloses an example in which a wiring pattern is formed on a support protrusion. As shown in FIG. 11, a wiring pattern 46 made of a conductive material such as a polysilicon film, a copper vapor-deposited film, or an aluminum vapor-deposited film is provided on the inner surface of the thin plate 3 (the surface on the side of the piezoelectric transformer 2). It extends to the node supporting projection 12 at a position corresponding to the input electrode. Although not shown, a wiring pattern 46 is similarly formed on the thin plate 4 so as to be in electrical contact with the other input electrode. The support member forming the wiring pattern 46 is not limited to the example shown in this embodiment, but can be applied to any of the first to fifth embodiments described above.

(VII) Seventh Embodiment FIGS. 12 and 13 show a seventh embodiment of the present invention. This embodiment discloses an example in which the contact resistance between the wiring pattern and the input electrode of the piezoelectric transformer 2 is reduced in the case where the wiring pattern is formed on the support protrusion. FIG.
As shown in the figure, the inner surface of the thin plate 4 (the surface on the side of the piezoelectric transformer 2)
Is provided with a wiring pattern 46 made of a conductive material such as a polysilicon film, a copper vapor-deposited film, and an aluminum vapor-deposited film, and extends to the node supporting protrusion 14 at a position corresponding to the input electrode of the piezoelectric transformer 2. I have. Then, the wiring pattern 46 on the nodal portion supporting protrusion 14 has a good conductor film 4 of gold, silver, carbon or the like.
7 is covered by means such as plating or vapor deposition.
A good conductive material to be coated may be appropriately selected from those which are compatible with the substance used for the input electrode of the piezoelectric transformer 2. Reference numeral 48 indicates a control circuit chip, and reference numeral 54 indicates solder plating.

FIG. 13 shows a modification of FIG.
The wiring pattern 46 is provided on the flat thin plate 4 and the good conductor film 47 is further provided thereon. On the other hand, in the thin plate 4 of this example, the formation portion of the node supporting projection 14 is depressed in a concave shape. This is an example in which a wiring pattern 46 and a good conductor film 47 are further provided. Other structures relating to the thin plates 3 and 4 are described in the second embodiment (FIG. 3).
4), and similar parts are denoted by the same reference numerals and description thereof is omitted.

(VIII) Eighth Embodiment FIG. 14 shows an eighth embodiment of the present invention. This embodiment discloses an example in which thin plates 3 and 4 having low heat resistance can be used. When assembling the piezoelectric transformer, various circuit components are mounted on the substrate or the thin plate 3 or 4, and the circuit pattern is soldered between the circuit components or the electric wiring to the input / output electrodes of the piezoelectric transformer 2. Since the soldering temperature is high, the thin plates 3 and 4 need to use a resin material (for example, a polyimide resin) that does not melt by heat. However, such heat-resistant resin is expensive,
This leads to a rise in manufacturing costs.

Therefore, in the present embodiment, the thin plates 3 and 4 are made of inexpensive and low heat-resistant materials, and a heat-resistant resin (for example, a polyimide resin or the like) is overlapped only on necessary portions, so that the overall structure is reduced. The cost is reduced. As shown in FIG. 14, the wiring pattern 46 of the thin plate 4
A heat-resistant film 49 is attached between the thin plate 4 and the wiring pattern 46 at and near the portion. Since the heat of soldering is blocked by the heat-resistant film 49, it is not necessary to use a heat-resistant resin for the entire thin plate 4. The thin plate 4 is formed with a convex portion 52 that can accommodate the circuit board 51,
The thin plate 3 is formed with a projection 52 that can accommodate the connection terminal 53.

(IX) Ninth Embodiment FIGS. 15 and 16 show a ninth embodiment of the present invention. This embodiment discloses an improved example regarding the position where the piezoelectric transformer 2 is housed in the substrate. In FIG. 15, a pair of support protrusions 55 and 56 is provided at one end of the substrate 54 along the direction in which the substrate 54 extends, and these support protrusions 5 are provided.
An attachment opening (storage space) 57 is formed between 5 and 56. A pair of width-direction support projections 58 are provided on the inner wall surface of the mounting opening 57 (end surface of the substrate 54) so as to correspond to the vibration nodes.

On the other hand, the piezoelectric transformer 2
A holder (support member) 59 having a U-shaped cross section that can be fitted over the support protrusions 55 and 56 in a state in which is accommodated is provided. A pair of width-direction support protrusions 60 are formed on the side of the holder 59 corresponding to the width-direction support protrusions 58, and the upper surface (and / or the lower surface) has a node support corresponding to the vibration node. A protrusion 61 is formed. The holder 59 can be formed by pressing using a sheet-shaped member, or can be formed by injection molding. When assembling, the holder 59 is held in a state where the piezoelectric transformer 2 is housed in the mounting opening 57.
Are fitted so as to sandwich the supporting protrusions 55 and 56 by sliding. The support protrusions 55 and 56 and the holder 59 are bonded and fixed with an adhesive or the like. Note that for the wiring of the electric circuit, the method disclosed in the above embodiment can be used.

FIGS. 16 (A) and 16 (B) disclose a modified example in which the shape of the holder is not a U-shaped cross section, but two support members 62 and 63 are separately provided. That is. The support members 62 and 63 are provided with a pair of node support protrusions 67 and 69 and width-direction support protrusions 64, 65, 66 and 68 corresponding to the vibration nodes of the piezoelectric transformer 2. The support member is formed in the mode shown in the embodiment (see FIG. 5A). With such a configuration, the degree of freedom of the circuit layout of the substrate 54, the ease of assembly, and the ease of processing of the substrate 54 can be achieved.

(X) Application Examples The scope of the present invention is not limited to the above embodiments, and various modifications or applications are possible as described below.
That is, in each of the embodiments described above, the piezoelectric transformer having two vibration nodes is described as an example. However, the present invention is directed to a piezoelectric transformer having another vibration pattern, for example, a tertiary rosen (vibration). The present invention can also be applied to a type of piezoelectric transformer having three nodes).

[0049]

As described above, according to the present invention, according to the invention described in claim 1, supporting the transverse and longitudinal directions of the piezoelectric transformer by the width direction protrusions and longitudinal support projections provided in the mounting opening of the substrate The vibrating nodes of the piezoelectric transformer are supported by elastic node supporting projections provided on a separate supporting member. Since the vibrating nodes of the piezoelectric transformer are supported by the elastic node supporting protrusions as described above, the vibrating nodes can be supported with an appropriate degree of freedom without restraining the vibrating nodes in a fixed manner to suppress vibration. it can. as a result,
It is possible to adapt to an increase in the vibration amplitude at the time of high output, and to prevent breakage of the piezoelectric transformer. Further, the piezoelectric element can be properly supported without suppressing vibration even when the vibration node position changes due to the fluctuation of the vibration wave number due to a change in environmental conditions or the like. Claim
According to the invention described in ( 2) , the piezoelectric transformer is elastically supported not only at the vibrating nodes but also as a whole, so that the vibrating nodes are not fixedly restrained and vibration is not suppressed. Can be supported with a degree of freedom. As a result, it is possible to adapt to an increase in vibration amplitude at the time of high output, and it is possible to prevent breakage of the piezoelectric transformer. Further, the piezoelectric element can be properly supported without suppressing vibration even when the vibration node position changes due to the fluctuation of the vibration wave number due to a change in environmental conditions or the like. According to the third aspect of the present invention, each of the support protrusions can be formed by cutting and erecting.
2. In addition to the operation according to the invention described in 2 , the width-direction support projection,
It is easy to form the longitudinal direction support projections and the knot support projections, it is possible to adjust the support strength and the added amount of elasticity, and it is possible to reduce the weight due to the cutout and cutting. According to the fourth aspect of the present invention, since each tip of each support projection is formed by bending in the thickness direction, in addition to the operation according to the second and third aspects, the width direction support projection is formed. It becomes possible to adjust the supporting strength and elasticity of the portion, the longitudinal supporting protrusion and the node supporting protrusion. According to the fifth aspect of the present invention, since each support protrusion is formed by press working, the width-direction support protrusion,
It is easy to form the longitudinal support protrusion and the node support protrusion, and it is possible to adjust the support strength and the amount of added elasticity for properly supporting the vibration node of the piezoelectric transformer without excessively suppressing the vibration node. . According to the invention as set forth in claim 6, the node supporting projection located on the other of the vibrating nodes of the piezoelectric transformer has a gap between the other vibrating nodes and the vibrating nodes in the loosely fitted state. As it supports, without excessively suppressing the vibration nodes,
It can be properly supported in a more free state. Claim
According to the invention described in Item 7 , since the longitudinal supporting protrusion has a gap between the piezoelectric transformer and the widthwise end face thereof and supports the piezoelectric transformer in a loosely fitted state, only in the thickness direction of the piezoelectric transformer. In addition, a degree of freedom is provided in the longitudinal direction, and the vibration node can be properly supported without excessively suppressing the vibration node. According to the invention as set forth in claim 8 , since the longitudinal supporting projection has a gap between the longitudinal end face of the piezoelectric transformer and supports the piezoelectric transformer in a loosely fitted state, the degree of freedom in the longitudinal direction is also increased. Is provided, and the node supporting protrusion located on the other vibrating node supports the vibrating node in a loose fit state with a gap between the other vibrating node and the vibrating node. Can be properly supported without excessively suppressing the pressure.

[Brief description of the drawings]

FIG. 1A is a plan view showing the inside of a support structure of a piezoelectric transformer according to a first embodiment of the present invention. (B)
FIG. 2 is a plan view showing a support structure of the piezoelectric transformer according to the first embodiment of the present invention.

FIG. 2A is a diagram showing a first embodiment of the present invention;
It is AA sectional drawing of. (B) is a BB sectional view of FIG. 1 according to the first embodiment of the present invention.

FIG. 3A is a plan view showing the inside of a support structure for a piezoelectric transformer according to a second embodiment of the present invention. (B) It is a top view showing the support structure of the piezoelectric transformer concerning a 2nd embodiment of the present invention.

FIG. 4 (A) is a diagram according to a second embodiment of the present invention;
It is CC sectional drawing of. (B) is a DD sectional view of FIG. 3 according to the second embodiment of the present invention.

FIG. 5A is a plan view showing the inside of a support structure for a piezoelectric transformer according to a third embodiment of the present invention. (B)
FIG. 9 is a plan view showing a piezoelectric transformer support structure according to a third embodiment of the present invention.

FIG. 6A is a diagram according to a third embodiment of the present invention;
It is EE sectional drawing of. (B) is FF sectional drawing of FIG. 5 which concerns on 3rd Embodiment of this invention.

FIG. 7A is a plan view showing the inside of a support structure for a piezoelectric transformer according to a fourth embodiment of the present invention. (B) It is a top view showing the support structure of the piezoelectric transformer concerning a 4th embodiment of the present invention.

FIG. 8A is a diagram showing a fourth embodiment of the present invention;
GG sectional view of FIG. (B) is an HH sectional view of FIG. 7 according to the fourth embodiment of the present invention.

FIG. 9A is a plan view showing the inside of a piezoelectric transformer supporting structure according to a fifth embodiment of the present invention. (B)
FIG. 15 is a plan view showing a support structure for a piezoelectric transformer according to a fifth embodiment of the present invention.

FIG. 10A is a sectional view taken along line II of FIG. 9 according to a fifth embodiment of the present invention. (B) is JJ sectional drawing of FIG. 9 which concerns on 5th Embodiment of this invention.

FIG. 11 is a partially cutaway perspective view showing a sixth embodiment of the present invention.

FIG. 12 is an exploded perspective view according to a seventh embodiment of the present invention.

FIG. 13 is a partially enlarged perspective view according to a seventh embodiment of the present invention.

FIG. 14 is an exploded perspective view according to a ninth embodiment of the present invention.

FIG. 15 is a perspective view showing another example of the support member according to the ninth embodiment of the present invention.

FIG. 16A is a perspective view showing an example of another support member according to the ninth embodiment of the present invention. (B) is KK sectional drawing of FIG.15 (B) which concerns on 9th Embodiment of this invention.

FIG. 17A is a plan view showing a main part of a conventional piezoelectric transformer support structure. (B) is a perspective view showing a main part of a conventional piezoelectric transformer support structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Substrate 2 Piezoelectric transformer 3 Thin plate 4 Thin plate 5, 6 Longitudinal support protrusion 7, 8, 9, 10 Width support protrusion 11 Mounting opening 12, 13, 14, 15 Node support protrusion 16, 17, 18 , 19 positioning protrusions 20, 21 positioning holes 22, 23 longitudinal support protrusions 24, 25, 26, 27, 28 width support protrusions 28, 29 longitudinal support protrusions 30, 31 support protrusions 32 longitudinal gap 33 Longitudinal gap 34 Node gap 35 Node gap 36, 37 Longitudinal support protrusion 38, 39, 40, 41 Width direction support protrusion 42, 43, 44, 45 Knot support protrusion 46 Wiring pattern 47 Good conductor layer 48 Control circuit chip 49 Heat-resistant film 50 Depression 51 Rectification circuit board 52 Storage projection 53 Terminal 54 Substrate 55 Support projection 56 Support projection 57 Mounting opening 58 Width direction support projection 59 E Da (support member) 60 width direction support projection 61 node support projection 62 thin plate 63 thin plate 64 width direction support protrusion 65 width direction support protrusion 66 width direction support protrusion 67 node portion support protrusion 68 width direction support protrusion Part 69 Knot support projection

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H01L 41/107 H05K 7/12 H02M 3/24

Claims (8)

(57) [Claims] 1. A widthwise support that has a size capable of accommodating the piezoelectric transformer with a gap around the plate-shaped piezoelectric transformer in the width direction and the longitudinal direction, and abuts on the widthwise end surface of the piezoelectric transformer. A substrate having a mounting opening provided with a protrusion and a longitudinal support protrusion abutting on a longitudinal end surface; and a node support made of an elastic material abutting on a vibration node of the piezoelectric transformer housed in the mounting opening. A support device for a piezoelectric transformer, comprising: a support member having a protrusion. 2. A substrate provided with a mounting opening capable of housing the piezoelectric transformer with a gap around the width and the length of the plate-shaped piezoelectric transformer, and a piezoelectric housed in the mounting opening. A support having a width-direction support protrusion abutting on the width-direction end surface of the transformer, a longitudinal direction support protrusion abutting on the longitudinal direction end surface, and a node support protrusion made of an elastic material abutting on a vibration node of the piezoelectric transformer. And a member for supporting the piezoelectric transformer. 3. The support device for a piezoelectric transformer according to claim 2, wherein the support member is a thin plate having flexibility and elasticity.
The supporting device for a piezoelectric transformer, wherein the width-direction support protrusion, the longitudinal-direction support protrusion, and the node-portion support protrusion are formed by protrusions formed by cutting and raising respective corresponding positions on the thin plate. 4. The supporting device for a piezoelectric transformer according to claim 3, wherein each end of the width-direction supporting protrusion, the longitudinal-direction supporting protrusion, and the node-portion supporting protrusion is bent in a thickness direction. A piezoelectric transformer supporting device, characterized in that: 5. The support device for a piezoelectric transformer according to claim 2, wherein the support member is a thin plate having flexibility and elasticity.
The supporting device for a piezoelectric transformer, wherein the width-direction support protrusion, the longitudinal-direction support protrusion, and the node-portion support protrusion are formed by protrusions formed by pressing corresponding positions on the thin plate. 6. A substrate provided with a mounting opening capable of housing the piezoelectric transformer with a gap around the width and the length of the plate-shaped piezoelectric transformer, and a piezoelectric housed in the mounting opening. A support having a width-direction support protrusion abutting on the width-direction end surface of the transformer, a longitudinal direction support protrusion abutting on the longitudinal direction end surface, and a node support protrusion made of an elastic material abutting on a vibration node of the piezoelectric transformer. The supporting member, wherein the node supporting protrusion located at one of the vibration nodes of the piezoelectric transformer is in contact with the one vibration node and located at the other of the vibration nodes of the piezoelectric transformer. A supporting portion for supporting the vibrating node in a loosely fitted state with a gap between the node supporting protrusion and the other vibrating node. 7. A substrate provided with a mounting opening capable of housing the piezoelectric transformer with a gap around the width and the length of the plate-shaped piezoelectric transformer, and a piezoelectric housed in the mounting opening. A width direction supporting projection provided at a position facing the width direction end face of the transformer, a longitudinal direction supporting projection provided at a position facing the longitudinal direction end face, and a position corresponding to a vibration node of the piezoelectric transformer. A supporting member having a node supporting protrusion made of an elastic material provided, wherein the supporting member has a width-direction supporting protrusion abutting on a width-direction end face of the piezoelectric transformer, and the longitudinal direction supporting protrusion has A supporting device for a piezoelectric transformer, wherein the piezoelectric transformer is supported in a loosely fitted state with a gap between the piezoelectric transformer and a longitudinal end face of the piezoelectric transformer. 8. A supporting device for a piezoelectric transformer, wherein the supporting member according to claim 7 and the supporting member according to claim 8 are combined.