JPH04112596U - piezoelectric sounding body - Google Patents

Abstract

(57) [Summary] [Purpose] To simplify the mounting work, reduce the number of necessary parts, and reduce the mounting space in a piezoelectric sounding element. [Structure] Piezoelectric plate 1 and insulating plate 2 to which this is pasted
It is a piezoelectric sounding body consisting of an electrode 3 formed on each of both main surfaces of a piezoelectric plate 1, and at least a pair of lead-out electrodes 4a, which communicate from the front surface to the back surface of the insulating plate 2.
4b is formed, one extraction electrode 4a is directly connected to the electrode 3 on the inner surface side of the piezoelectric plate 1, and the other extraction electrode 4b is connected to the electrode 3 on the outer surface side of the piezoelectric plate 1 via a conductive material 5. It is connected to the.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a piezoelectric sounding body used in constructing a buzzer or the like.

0002

[Conventional technology]

Conventionally, as this type of piezoelectric sounding element, the external perspective view shown in FIG. 7 and the mounting state shown in FIG. Some devices are configured as shown in the cross-sectional view. That is, as shown in FIG. A conventional piezoelectric sounding body includes a piezoelectric plate 21 and a metal plate having a diameter larger than that of the piezoelectric plate 21. It consists of 22. Here, the piezoelectric plate 21 has electrodes 23 formed on both main surfaces. It is attached to one side of the metal plate 22.

0003 When mounting this piezoelectric sounding element on a board, as shown in Figure 8, A ring-shaped holding material 25 is provided at a predetermined position on the mounting board 24, and this holding material 25 The piezoelectric sounding element is mounted so as to support the periphery. Ru. Further, a lead wire 26 is connected to the electrode 23 on the front side of the piezoelectric plate 21 and the metal plate 22. are attached to the electrodes 23 on the surface side of the piezoelectric plate 21 via these lead wires 26. and the metal plate 22 are connected to the corresponding conductor pattern 27 on the mounting board 24. are connected to each other.

0004

[Problem that the idea aims to solve]

By the way, in the conventional piezoelectric sounding body, there is a problem in mounting it on the mounting board 24 and electrically connecting it to the mounting board 24. The connection must be made separately, and there is no lead between the conductor pattern 27. Since it is necessary to connect the lead wire 26 by soldering, the mounting work is troublesome.

[0005] Additionally, a holding material 25 is required to support the metal plate 22 on the mounting board 24. This not only increases the number of parts, but also requires installation of the holding material 25 and drawing of the lead wire 26. It was supposed to require a large mounting space for installation.

[0006] The present invention was devised in view of these inconveniences, and it We aim to simplify the mounting work by making it possible to perform installation and electrical connection all at once. The second objective is to reduce the number of parts and the mounting space.

[0007]

[Means to solve the problem]

In order to achieve this purpose, the present invention uses a piezoelectric plate and a piezoelectric plate bonded together. A piezoelectric sounding body consisting of an insulating plate and an electrode on each of the main surfaces of the piezoelectric plate. and the insulating plate has at least one pair of lead-out voltages leading from the front surface to the back surface. One of the extraction electrodes is directly connected to the electrode on the inner surface of the piezoelectric plate. The other extraction electrode is connected to the electrode on the outer surface of the piezoelectric plate via a conductive material. It is characterized by the fact that

[0008]

[Effect]

When implementing the piezoelectric sounding element with the above configuration, it is necessary to implement the entire piezoelectric sounding element. Place it on the corresponding conductor pattern of the insulating board, and connect the electrode formed on the back side of the insulating board. Just solder it to the land of the body pattern. In other words, the piezoelectric sounding body is The piezoelectric plate is supported and fixed with a slight gap between it and the mounting board. Each electrode is connected to the corresponding conductor pattern on the mounting board through the lead electrode and solder. are connected to each other.

[0009]

【Example】

Hereinafter, the details of the present invention will be explained based on the embodiments shown in FIGS. 1 to 6. this 1 to 4 show one embodiment of the present invention, FIG. 1 is an external perspective view, and FIG. 2 is an external perspective view. 3 is an exploded perspective view, FIG. 3 is a sectional view of the insulating plate along line A-A in FIG. 2, and FIG. 4 shows the mounted state. FIG.

0010 As shown in these figures, the piezoelectric sounding body of this embodiment includes a piezoelectric plate 1 and a piezoelectric plate 1 under tension. It consists of an insulating plate 2 that is assembled together.

[0011] The piezoelectric plate 1 has electrodes 3 on both main surfaces. The insulating plate 2 is made of alumina, It is a thin plate made of hard resin, glass, etc., and has a larger diameter than the piezoelectric plate 1. Ru. This insulating board 2 has a pair of drawers on its surface, as shown in Figure 2. Electrodes 4a and 4b are formed. Note that at this time, one of the extraction electrodes 4a is The other lead electrode 4b is drawn out from the center of the insulating plate 2, and the other lead electrode 4b is drawn out from the outer diameter part of the insulating plate 2. It is set in. As shown in FIG. 3, each extraction electrode 4a, 4b is It is continuous to the terminal electrodes 4c and 4d on the back surface via the periphery of the insulating plate 2.

0012 A piezoelectric plate 1 is bonded to the surface of the insulating plate 2. This bonding is It may be adhesive bonding, soldering, heat fusion, or green sheeting. Alternatively, the insulating plate 2 and the piezoelectric plate 1 may be in a blank state. And this paste Due to the alignment, the electrode 3 on the bonded inner surface side of the piezoelectric plate 1 is connected from the center of the insulating plate 2. is connected to the extraction electrode 4a. Furthermore, the lead-out voltage on the outer diameter side of the insulating plate 2 is Between the pole 4b and the electrode 3 on the surface side of the piezoelectric plate 1, conductive paste or gold is applied. A conductive material 5 formed into a film by vapor deposition or the like is provided, and this conductive material 5 The extraction electrode 4b on the outer diameter side and the electrode 3 on the surface side of the piezoelectric plate 1 are connected. .

[0013] According to the above configuration, the electrode 3 on the inner surface side of the piezoelectric plate 1 is pulled from the center of the insulating plate 2. It is electrically connected to one terminal electrode 4c through the exposed electrode 4a, and the electrode on the surface side of the piezoelectric plate 1 3 is the other terminal electrode through the conductive material 5 and the lead electrode 4b on the outer diameter side of the insulating plate 2. This means that it is electrically connected to 4d. Therefore, the piezoelectric plate 1 and the insulating plate 2 are bonded together. The back side of the insulating plate 2 has a pair of terminal electrodes 4c and 4d. A piezoelectric sounding body is obtained.

[0014] By the way, when mounting this piezoelectric sounding element, as shown in FIG. The piezoelectric sounding body is positioned on the conductive pattern 7 of the substrate 6, and the land of the conductive pattern 7 is The terminal electrodes 4c and 4d on the back surface of the insulating plate 2 may be soldered to the terminal electrodes 4c and 4d. Then, this pressure The electric sounding body is arranged so that there is a slight gap between the insulating plate 2 and the mounting board 6 via the solder 8. It will be supported and fixed in this position. Further, each terminal electrode 4c, 4d is connected to a conductor pattern 7. Each electrode 3 of the piezoelectric plate 1 is soldered to the land of the lead electrode 4a, 4b, or through the terminal electrodes 4c, 4d and solder 8. They will be connected to the corresponding conductor patterns 7 on the plate 6, respectively.

[0015] FIG. 5 shows another embodiment, in which the extraction electrode 4 of the insulating plate 2 is a, 4b are electrically connected to terminal electrodes 4c, 4d on the back side through through holes 9, 9. You may also do so.

[0016] FIG. 6 shows still another embodiment. In this embodiment, both sides of the insulating plate 2 are Piezoelectric plates 1 and 1 are bonded to each other. Corresponding to these piezoelectric plates 1, 1, A pair of extraction electrodes 4a and 4b are formed on both sides of the insulating plate 2, respectively. The extraction electrodes 4a and 4b are continuous with each other at the peripheral edge of the insulating plate 2. child When mounting the piezoelectric sounding body of the embodiment, the peripheral edges of the extraction electrodes 4a and 4b are All you have to do is solder it to the conductor pattern on the mounting board.

[0017] In each of the illustrated embodiments, the pair of lead-out electrodes 4a, 4b are placed approximately on the insulating plate 2. Although the extraction electrodes 4a and 4b are provided at both ends in the diametrical direction, the extraction direction and shape of the extraction electrodes 4a and 4b can be freely determined. Can be set at will. In addition, a cover case for resonance may be attached to the surface of the insulating plate 2. , a sound collecting plate may be attached to the piezoelectric plate 1. In addition, the insulating plate 2 is simply a flat It is not plate-shaped, but has holes, protrusions, or Its planar shape may be polygonal, depending on the purpose. Any molded item is acceptable.

[0018]

[Effect of the idea]

As explained above, the piezoelectric sounding element according to the present invention has a conductive pattern on a mounting board. By soldering directly to the There is no need to provide a holding material to the mounting board or connect it with lead wires, making mounting work easier. will be simplified.

[0019] In addition, mounting space for mounting is eliminated as there is no need to attach holding materials or connect lead wires. Because it is smaller and the number of parts is also reduced, the cost is reduced by simplifying the mounting work. It is possible to downgrade.

[Brief explanation of drawings]

FIG. 1 is an external perspective view of a piezoelectric sounding body according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view of the piezoelectric sounding body.

FIG. 3 is a cross-sectional view of the insulating plate taken along line AA in FIG. 2;

FIG. 4 is a cross-sectional view showing the mounting state of the piezoelectric sounding body.

FIG. 5 is an exploded cross-sectional view of a piezoelectric sounding body according to another embodiment of the present invention.

FIG. 6 is a sectional view of a piezoelectric sounding body according to still another embodiment of the present invention.

FIG. 7 is an external perspective view of a conventional piezoelectric sounding body.

FIG. 8 is a sectional view showing its mounting state.

[Explanation of symbols]

1 Piezoelectric plate 2 Insulating board 3 electrode 4a, 4b Extraction electrode 5 Conductive material 6 Mounting board 7 Conductor pattern 8 Solder

Claims (1)

[Scope of utility model registration request] 1. A piezoelectric sounding body consisting of a piezoelectric plate (1) and an insulating plate (2) to which the piezoelectric plate (1) is pasted together, wherein an electrode (3) is formed on each of both main surfaces of the piezoelectric plate (1). ,
Moreover, at least a pair of extraction electrodes (4a, 4b) communicating from the front surface to the back surface are formed on the insulating plate (2), and one extraction electrode (4a) is connected to the electrode (3) on the inner surface side of the piezoelectric plate (1). ), and the other extraction electrode (4b) is connected to the electrode (3) on the outer surface side of the piezoelectric plate (1) via a conductive material (5). .