JP2591799Y2 - Piezoelectric transformer holder - Google Patents

Description

[Detailed description of the invention]

[0001]

The present invention relates to barium titanate, P
The present invention relates to a piezoelectric transformer using a piezoelectric material such as ZT porcelain and lead titanate porcelain, and more particularly to a structure for holding a piezoelectric transformer.

[0002]

2. Description of the Related Art As a general holding structure of a conventional piezoelectric transformer, as shown in a conventional example of Japanese Utility Model Publication No. Sho 59-30541, a piezoelectric transformer is supported by a square ring at a node of mechanical vibration. There has been a configuration (configuration A) in which an input / output lead wire is soldered to an input / output electrode of a transformer or joined via conductive rubber. Further, as another holding structure, as shown in Japanese Utility Model Publication No. 46-4040, the piezoelectric transformer is housed in an insulating casing via a spring piece so as to be in contact with an input electrode of a drive unit and an output electrode of a power generation unit. There has been a configuration (configuration B) in which an end of the spring piece protrudes from the insulating casing to form a terminal.

[0003]

[Problem to be solved by the invention]
Mechanically joins the circuit board and the square ring of the piezoelectric transformer with a joining material, and electrically connects the electrode pad of the circuit board and the input / output electrode of the piezoelectric transformer with a conductive joining material via a lead wire. Mechanical connection and electrical connection had to be made separately in order to make a proper connection. Therefore, the productivity is low, and there is a problem in the accuracy of mounting on a substrate.
Usually, during driving of the piezoelectric transformer, heat is generated at about 60 ° C. to 80 ° C., and if the state continues without cooling, there is a problem that the voltage conversion efficiency is reduced. The problem of being covered, poor heat dissipation, and lowering the voltage conversion efficiency was likely to occur. In addition, the above configuration B tends to be larger than usual in terms of space, and has been unsuitable in recent years as it is becoming smaller and thinner.

Accordingly, an object of the present invention is to provide a more reliable piezoelectric transformer with respect to a structure for holding the piezoelectric transformer.

[0005]

SUMMARY OF THE INVENTION The present invention provides a structure of a holder for holding a piezoelectric ceramic plate on a substrate or a structure, wherein an upper holding member and a lower holder are sandwiched between the front and back surfaces of the piezoelectric ceramic plate. The upper holding member and the lower holding member are each provided with a piezoelectric ceramic plate mounting portion for sandwiching the vicinity of a vibrating node of the piezoelectric ceramic plate. A hinge is provided to connect one end of the upper holder and the lower holder and to open and close the other end of the upper holder and the lower holder. The other end is provided with a connectable joint.

[0006] Each holder for holding the vicinity of the vibrating node between the power generation section and the drive section of the piezoelectric ceramic plate is integrally formed.

Further, an external terminal for connecting to an external circuit is provided on the holder, and a conducting means for electrically connecting the external terminal to an input / output electrode formed on the piezoelectric ceramic plate is provided.

[0008]

The piezoelectric ceramic plate is composed of two parts, an upper holder and a lower holder, so that the piezoelectric ceramic plate can be sandwiched from the front and back surfaces. The other end of the upper and lower holders is provided with a hinge portion that can be opened and closed, and the other end of the upper and lower holders is provided with a connectable engaging portion to hold the piezoelectric ceramic plate. There is no need to use a bonding material for mounting work on the tool,
The piezoelectric ceramic plate can be mounted extremely simply, and the work can be performed more efficiently.

In addition, since the holders for holding the vicinity of the vibrating nodes of the power generation unit and the drive unit of the piezoelectric ceramic plate are integrally formed, the piezoelectric ceramic plate can be mounted much more simply and the piezoelectric ceramic plate can be mounted. The work of mounting the plate on the holder is made more efficient, and the work of forming the holder is made more efficient.

[0010] Further, by providing an external terminal for connecting to an external circuit to the holder, and conducting means for electrically connecting the external terminal to an input / output electrode formed on the piezoelectric ceramic plate, Since the external terminals of the holder can be joined to the terminal pads on the circuit board by a conductive joining material, mechanical joining and electric joining can be performed simultaneously.

[0011]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of a first embodiment of the present invention in a state in which a holder is opened. FIG. 2 is a perspective view of the first embodiment of the present invention with the holder closed. FIG. 3 is a perspective view showing a first embodiment of the present invention. The same parts as those in the other examples are denoted by the same reference numerals. As shown in FIG. 3, the piezoelectric transformer is formed of a rectangular piezoelectric ceramic plate 1 formed by firing ceramic. The left half of the piezoelectric ceramic plate 1 is a drive unit, on which input electrodes 2 and 3 are formed.
The right half of the piezoelectric ceramic plate 1 is a power generation unit, and an output electrode 4 is formed on the right side surface of the power generation unit. These electrodes are formed of a thick film using, for example, a silver paste.
The holders 5 and 6, which are support structures, are made of a resin such as PPS or liquid crystal polymer. The holder 5 is composed of two parts, an upper holder 5A and a lower holder 5B, which sandwich the driving portion of the piezoelectric ceramic plate 1 from the front and back surfaces, and the upper holder and the lower holder respectively include the piezoelectric ceramic. A concave piezoelectric ceramic plate mounting portion 8 capable of storing the plate 1 is provided,
In addition, a convex body 7 for sandwiching the vicinity of the vibration node portion of the piezoelectric ceramic plate 1 is formed. By providing a hinge 9 at one end of the holder 5, the other end of the upper holder 5A and the lower holder 5B can be opened and closed. At the other end of the holder 5, the upper holder 5A is provided with a semi-circular convex locking portion 10, and the lower holder 5B
Provided with a semicircular concave locking portion 11. This semicircular convex locking portion 10
And the semicircular concave locking portion 11 are formed so as to engage with each other, and when the upper holding body 5A and the lower holding body 5B are closed, the semicircular convex locking portion 10 and the semicircular concave Locking part 11
And the upper holding member 5A and the lower holding member 5B are prevented from re-opening. In addition, the holding tool 5 is connected to the convex object 7 by a technique such as metal evaporation.
Leading electrodes 12A and 12B are formed to route conductors from the upper surface of the holder to the side surfaces of the respective holders. Therefore, the electrical connection between the input electrode of the piezoelectric ceramic plate 1 and the external terminal can be obtained through the routing electrodes 12A and 12B. Pins 5a, 5b and 6a are attached to the bottom surfaces of the holders 5 and 6 as external terminals. Note that the holder 6 is formed in exactly the same manner as the holder 5 except that a lead-out electrode is formed, and a description thereof will be omitted. The piezoelectric ceramic plate 1 is sandwiched and mounted on the holders 5 and 6, and the lead-out electrodes 12A and pins 5b, the lead-out electrodes 12B and 5a, and the output electrodes 4 and 6a of the piezoelectric ceramic plate are electrically connected. By making a proper connection, a piezoelectric transformer device can be obtained.

In the embodiment of the present invention, the description has been made with the semicircular convex locking portion and the semicircular concave locking portion.
The shape may be an elliptical shape, a triangular shape, or the like, and the shape is not particularly limited.

Next, a second embodiment of the present invention will be described with reference to the drawings. FIG. 4 is a perspective view of a piezoelectric transformer according to a second embodiment of the present invention. The holder 56 of this embodiment is obtained by integrally forming the holders 5 and 6 of the first embodiment, and has a configuration having vibration node supporting portions 51 and 61 and a connecting portion. The holder 56 is also made of a resin such as PPS or liquid crystal polymer, as in the above embodiment. Holder 56
Is composed of two parts, an upper holding body 51A and a lower holding body 51B, which sandwich the driving section of the piezoelectric ceramic plate 1 from the front and back surfaces (in the power generation section, 61A, 61A).
B) Each of the upper holder and the lower holder is provided with a concave piezoelectric ceramic plate mounting portion capable of accommodating the piezoelectric ceramic plate 1, and a convex shape for sandwiching the vicinity of the vibrating node of the piezoelectric ceramic plate 1. An object (not shown) is formed. The hinge portion 9 is provided at one end of the holder 56 so that the other end of the upper holder and the lower holder can be opened and closed. At the other end of the holder 56, the upper holders 51A and 61A are provided with semicircular convex locking portions 10, and the lower holders 51B and 61B are provided with semicircular concave locking portions 11. The semicircular convex locking portion 10 and the semicircular concave locking portion 11 are formed so as to engage with each other, and when the upper holding body and the lower holding body are closed, the semicircular convex locking The portion 10 and the semicircular concave locking portion 11 are engaged with each other to function as a coupling portion for preventing the upper holding body and the lower holding body from opening again. In addition, the vibrating node support portion 5
Reference numeral 1 denotes a routing electrode 13A (only a part is shown) for routing a conductor from the upper surface of the projection to the side surface of each holder. Therefore, the electrical connection between the input electrode of the piezoelectric ceramic plate 1 and the external terminal can be obtained through the routing electrode. External terminals 51a, 51b, 61a, and 61b are provided on the bottom surface of the connecting portion of the holder 56. The external terminals are buried and attached in the resin molding stage, and are routed by lead wires or the like.
A and external terminals 51 and the routing electrodes on the bottom side (not shown)
a, 51b, and the output terminal 4 of the piezoelectric ceramic plate mounted on the holder 56 and the external terminal 61a are electrically connected. The piezoelectric transformer device is obtained as described above.

Next, a third embodiment of the present invention will be described with reference to the drawings. FIG. 5 is a perspective view of a piezoelectric transformer showing a third embodiment of the present invention. The structure 65 of this embodiment is obtained by further integrally forming the holder 56 of the second embodiment, and is an integral connecting portion for integrally connecting the vibrating node supporting portions 52 and 62 and these vibrating node supporting portions. And a configuration having: This structure 65 is also made of a resin such as PPS or liquid crystal polymer, as in the above embodiment. The structure 65 is composed of two parts, an upper holding structure 65A and a lower holding structure 65B that sandwich the piezoelectric ceramic plate 1 from the front and back surfaces. A concave piezoelectric ceramic plate mounting portion capable of accommodating the ceramic plate 1 is provided, and a convex body (not shown) for sandwiching the vicinity of the vibration node portion of the piezoelectric ceramic plate 1 is formed. The hinge portion 9 is provided at one end of the structure 65, so that the other end of the upper holding structure and the lower holding structure can be opened and closed.
Then, at the other end of the structure 65, the upper holding structure 6
5A, semicircular convex locking portions 10 are provided on the vibration node supporting portions 52 and 62, and semicircular concave locking portions are provided on the lower vibration node supporting portions 52 and 62 of the lower holding structure 65B. 1
1 was provided. The semicircular convex locking portion 10 and the semicircular concave locking portion 11
Are formed so as to engage with each other, and when the upper holding structure and the lower holding structure are closed, the semicircular convex locking portion 10 and the semicircular concave locking portion 11 mesh with each other. hand,
It has the function of a joint that prevents the upper holding structure and the lower holding structure from reopening. In addition, the vibrating node supporting portion 52 is a routing electrode 14A (only a part is shown) for routing a conductor from the upper surface of the projection to the side surface of each holder.
Are formed. Therefore, the electrical connection between the input electrode of the piezoelectric ceramic plate 1 and the external terminal can be obtained through the routing electrode. External terminals 65a, 65b, 65c, 65d are attached to four corners of the bottom surface of the structure 65. The external terminals are attached to the structure 65 with a bonding material. The external electrodes 65A and 65b, the external electrodes 65a and 65b, the external electrodes 65A and 65b, and the external electrodes 14A and the unillustrated external electrodes 65A and 65B are connected to each other by lead wires. The output electrode 4 of the ceramic plate and the external terminal 65d are electrically connected. The piezoelectric transformer device is obtained as described above. The piezoelectric transformer device constituted by the structure 65 as described above can be handled as a unit, and can be surface-mounted. In addition, the function of the piezoelectric transformer does not deteriorate, and on the other hand, since the exposed surfaces of both the front and back surfaces of the piezoelectric ceramic plate are large, the heat dissipation efficiency is good, so that the performance does not decrease due to heat.

In the embodiment of the present invention, the connection between the external electrodes and the lead electrodes formed on the holder and the structure is made by electrical connection, but the lead electrodes are directly connected to the external terminals. It may be extended to make an electrical connection. This simplifies the installation work and improves workability. Further, in the embodiment of the present invention, the upper holding member and the lower holding member are each provided with a piezoelectric ceramic plate mounting portion formed with a convex body for sandwiching the vicinity of the vibrating node portion of the piezoelectric ceramic plate. A holding structure that holds the ceramic plate linearly and does not hinder the vibration of the piezoelectric ceramic plate is obtained.

[0016]

According to the first aspect of the present invention, the piezoelectric ceramic plate is composed of two parts, an upper holder and a lower holder, so that the piezoelectric ceramic plate can be sandwiched from the front and back surfaces, and one end of the upper holder and the lower holder is connected. A hinge portion that couples and opens and closes the other ends of the upper holder and the lower holder is provided, and a connectable portion is provided at the other end of the upper holder and the lower holder. Accordingly, there is no need to use a bonding material for the operation of mounting the piezoelectric ceramic plate on the holder, and the piezoelectric ceramic plate can be mounted extremely simply, and the efficiency of the operation can be increased. In addition, since most of the portion other than the holding portion of the piezoelectric ceramic plate is exposed, the heat dissipation is good, and there is no deterioration in the electrical characteristics such that the voltage conversion efficiency decreases due to the temperature rise. By these actions, a highly reliable piezoelectric transformer can be provided in terms of workability and productivity or in terms of electrical characteristics of the piezoelectric transformer.

According to the second aspect of the present invention, the respective holders for holding the vicinity of the vibrating nodes of the power generation unit and the drive unit of the piezoelectric ceramic plate are integrally formed, so that the piezoelectric ceramic plate can be formed much more simply. It can be attached and detached, and the work of mounting the piezoelectric ceramic plate on the holder is made more efficient. For this reason, a piezoelectric transformer with higher reliability in terms of workability and productivity can be provided.

According to the third aspect, the holder is provided with an external terminal for connection to an external circuit, and a conductive means for electrically connecting the external terminal to an input / output electrode formed on the piezoelectric ceramic plate is provided. Since the external terminals of the holder can be bonded to the terminal pads on the circuit board by the conductive bonding material, the mechanical bonding and the electrical bonding can be performed simultaneously. Therefore, the productivity is good, the precision of mounting on the substrate is improved, and the surface mounting and automation of the piezoelectric transformer can be performed. Furthermore, since the form as a unit can be ensured, handling becomes simple and the use is expanded.

[Brief description of the drawings]

FIG. 1 is a perspective view of a first embodiment of the present invention in a state where a holder is opened.

FIG. 2 is a perspective view of the first embodiment of the present invention with the holder closed.

FIG. 3 is a perspective view showing the first embodiment of the present invention.

FIG. 4 is a perspective view showing a second embodiment of the present invention.

FIG. 5 is a perspective view showing a third embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Piezoelectric transformer 2, 3 ... Input electrode 4 ... Output electrode 5, 6 ... Holder 5A ... Upper holder 5B ... Lower holder 5a, 5b, 6a ... Pin 7: Convex object 8: Piezoelectric ceramic plate mounting section 9: Hinge section 10: Semicircular convex locking section 11: Semicircular concave locking section 12A, 12B: Routing Electrodes 51, 61: vibrating node part supporting portion 51A, 61A: upper holder 51B, 61B: lower holder 51a, 51b, 61a, 61b: external terminal 56: holder 13A ..Routing electrodes 65... Structures 52 and 62... Vibrating node support portions 65A... Upper holder 65B.・ Routing electrode

Claims (3)

(57) [Scope of request for utility model registration] 1. A structure of a holder for holding a piezoelectric ceramic plate on a substrate or a structure, wherein the holder is formed of an upper holder and a lower holder so as to sandwich the piezoelectric ceramic plate from the front and back surfaces. One end of the upper holder and the lower holder, each of the upper holder and the lower holder having a piezoelectric ceramic plate mounting portion sandwiching a vibrating node portion of the piezoelectric ceramic plate between the upper holder and the lower holder. Side, and a hinge portion is configured to open and close the other end side of the upper holding body and the lower holding body,
A holder for a piezoelectric transformer, comprising: an engagement portion provided at the other end of the upper holding member and the lower holding member; 2. The piezoelectric transformer according to claim 1, wherein each holding member for holding the vicinity of a vibration node between the power generation section and the drive section of the piezoelectric ceramic plate is integrally formed. Holder. 3. The holder is provided with an external terminal for connecting to an external circuit, and a conducting means for electrically connecting the external terminal to an input / output electrode formed on a piezoelectric ceramic plate is provided. The holder for a piezoelectric transformer according to claim 1 and claim 2.