JPH06138881A - Piezoelectric buzzer - Google Patents

Abstract

PURPOSE:To provide a piezoelectric buzzer with tapering structure capable of easily performing packaging by using an automatic packaging machine as keeping the contact pressure of a connection terminal on a piezoelectric oscillation plate appropriately. CONSTITUTION:This buzzer is the piezoelectric buzzer 1 equipped with the piezoelectric oscillation plate 11, a case main body 12, and a pair of connection terminals 2 which energize the piezoelectric oscillation plate 11 by coming contact with it, and each of the connection terminals 2 is formed by connecting the outer terminal part 3b of an inside member 3 in which an inner terminal part 3a comes in contact with the prescribed part of the piezoelectric oscillation plate 11 elastically is connected to the inner terminal part 4a of an outside member 4 protruding to the outside piercing through the case main body 12 in the inside, and the outside member 4 is provided with prescribed required thickness in the packaging.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a piezoelectric buzzer, and more particularly, to a connection terminal structure therefor.

[0002]

2. Description of the Related Art Conventionally, as a piezoelectric buzzer, what is called a pin type as shown in FIG. 3 is known.
This kind of piezoelectric buzzer 10 includes a piezoelectric vibrating plate 11 formed by facing a piezoelectric ceramic plate 11a and a metal plate 11b to each other,
The piezoelectric vibrating plate 11 is provided with a case body 12 made of resin or the like for accommodating and holding the piezoelectric vibrating plate 11, and a pair of connection terminals 13 that come into contact with the piezoelectric vibrating plate 11 to conduct electricity. The connection terminal 13 is formed using a material such as phosphor bronze, and its inner end portion 13a is elastically attached to each of the piezoelectric ceramic plate 11a and the metal plate 11b forming the piezoelectric vibrating plate 11. While contacting, the outer end portion 13b penetrates the case body 12 and is projected to the outside. In order to obtain good sound pressure characteristics in the piezoelectric buzzer 10, it is necessary to set the contact pressure at each inner end portion 13a of the connection terminal 13 to about 40 to 100 gf, and in order to obtain this degree of contact pressure. The plate thickness of each of the connection terminals 13 is generally set to about 0.15 to 0.2 mm.

[0003]

By the way, regarding the piezoelectric buzzer 10 having the above-mentioned conventional structure, a plurality of these are connected in parallel via the tape 14 as shown by the phantom line in FIG. In recent years, there has been an increasing demand for mounting on an automatic mounting machine (not shown) in addition to a taping structure, and the taped piezoelectric buzzer 10
Each of them will be separately mounted on a required circuit board (not shown) while using an automatic mounting machine. However, in a general-purpose automatic mounting machine, the thickness of the connection terminal 13 that can be cut and clinched is usually restricted to, for example, 0.3 mm or more. 0.15
When the thickness is as thin as about 0.2 mm, the general-purpose automatic mounting machine cannot be used, and the special-specific automatic mounting machine needs to be used, resulting in an increase in manufacturing cost.

In spite of such circumstances, if a general-purpose automatic mounting machine is to be used, another dummy member (not shown) is provided along each connection terminal 13 of the piezoelectric buzzer 10. To increase the thickness, or, for example, as disclosed in JP-A-63-248671, a dummy terminal (for each piezoelectric buzzer 10) having a predetermined thickness completely different from the connection terminal 13 ( It will be necessary to attach (not shown) or the like. However, if such a dummy member or dummy terminal is used, it takes extra time to add them, and when the dummy terminal is attached, sometimes the dummy terminal or dummy terminal is used for the dummy terminal. As a result of it being necessary to improve the mounting accuracy after forming the insertion hole and the like with high accuracy, the manufacturing cost also increases significantly.

The present invention was devised in view of such inconveniences, and it is possible to perform reliable mounting using an automatic mounting machine while appropriately maintaining the contact pressure of the connection terminal with respect to the piezoelectric diaphragm. The purpose is to provide a piezoelectric buzzer.

[0006]

In order to achieve such an object, a piezoelectric buzzer according to the present invention comprises a piezoelectric vibrating plate, a case body for housing the piezoelectric vibrating plate, and a pair of members that are in contact with the piezoelectric vibrating plate for electrical conduction. Connection terminals, each of the connection terminals penetrating the case body and the outer end portion of the inner member whose inner end portion elastically contacts the respective predetermined portions of the piezoelectric vibration plate. And an inner end portion of an outer member projecting to the outside are connected inside the case body, and the outer member has a predetermined thickness necessary for mounting.

[0007]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view showing a schematic structure of a piezoelectric buzzer according to this embodiment, and FIG. 2 is an exploded perspective view showing a main part thereof. Reference numeral 1 in FIG. 1 is a pin type piezoelectric buzzer. Shows. Since the entire structure of the piezoelectric buzzer 1 is basically the same as that of the conventional example, the same or corresponding parts and portions as those in FIG. 3 are denoted by the same reference numerals in FIGS. 1 and 2.

As shown in FIG. 1, the piezoelectric buzzer 1 according to the present embodiment is in contact with the piezoelectric vibrating plate 11 having the required characteristics, the case body 12 for accommodating the piezoelectric vibrating plate 11, and the piezoelectric vibrating plate 11. The piezoelectric vibrating plate 11 includes a pair of connection terminals 2 that are electrically connected to each other, and a piezoelectric ceramic plate 11a having electrodes (not shown) formed on both front and back surfaces thereof.
A metal plate 11b having an outer diameter larger than this is concentrically faced and then joined by a conductive adhesive (not shown) or the like. The case body 12 is formed of a thermoplastic resin or the like, and is configured to position and hold the outer peripheral edge of the metal plate 11b.

Further, each of the connection terminals 2 has an inner member 3 disposed inside the case body 12 and a case body 12.
The inner member 3 is made of a material such as phosphor bronze and has a thickness of 0.15 to 0.15.
The outer member 4 has a thin thickness of about 0.2 mm, while the outer member 4 has a predetermined thickness required for mounting the piezoelectric buzzer 1, that is,
It has a thickness of 0.3 mm or more that can be held by a general-purpose automatic mounting machine. Therefore, each of the inner end portions 3a of the inner member 3 forming the connection terminal 2 has a piezoelectric vibrating plate 11
Of the piezoelectric vibrating plate 11, that is, the piezoelectric ceramic plate 11a and the metal plate 11b constituting the piezoelectric vibrating plate 11 are elastically contacted by a contact pressure of about 40 to 100 gf.

On the other hand, the outer end portion 3b of each inner member 3 is
As shown in FIG. 2, the inner end 4a of the outer member 4 is press-fitted inside the case body 12 to be integrally connected, and the inner member 3 and the outer member 4 are connected to each other.
Is in continuity with. The connection between the two is not limited to the press-fitting, and for example, the outer end portion 3b of the inner member 3 may be connected.
Needless to say, the structure may be such that the is externally fitted to the inner end portion 4a of the outer member 4 and welded. Then, a plurality of the piezoelectric buzzers 1 having the above-mentioned configuration are formed into a taping structure using a tape 14 as shown by an imaginary line in FIG. 1 and then loaded into an automatic mounting machine (not shown), In addition, the automatic mounting machine individually mounts on a required circuit board (not shown).

[0012]

As described above, according to the piezoelectric buzzer of the present invention, the inner member elastically contacting the piezoelectric diaphragm and the outer member having a predetermined thickness necessary for mounting are connected. Since the connection terminal is thus configured, the piezoelectric buzzer can be surely mounted using the general-purpose automatic mounting machine while appropriately maintaining the contact pressure of the connection terminal with respect to the piezoelectric diaphragm. Therefore, it is not necessary to use a special-purpose automatic mounting machine as in the conventional example or to add a dummy member or a dummy terminal, which requires time and labor, and as a result, it is possible to easily significantly reduce the manufacturing cost. The effect is obtained.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a schematic configuration of a piezoelectric buzzer according to this example.

FIG. 2 is a perspective view showing an exploded view of the main part thereof.

FIG. 3 is a sectional view showing a schematic configuration of a piezoelectric buzzer according to a conventional example.

[Explanation of symbols]

 1 Piezoelectric Buzzer 2 Connection Terminal 3 Inner Member 3a Inner End 3b Outer End 4 Outer Terminal 4a Inner End 11 Piezoelectric Vibrating Plate 12 Case Body

Front page continuation (72) Inventor Masataka Kida 2-10-10 Tenjin, Nagaokakyo, Kyoto, Murata Manufacturing Co., Ltd. (72) Inventor Shizuo Okuhara 2-10-10 Tenjin, Nagaokakyo, Kyoto Murata Manufacturing (72) Inventor Osamu Segawa 2-10-10 Tenjin, Nagaokakyo City, Kyoto Prefecture Murata Manufacturing Co., Ltd.

Claims (1)

[Claims] 1. A piezoelectric buzzer comprising a piezoelectric vibrating plate (11), a case body (12) accommodating the piezoelectric vibrating plate, and a pair of connection terminals (2) that come into contact with the piezoelectric vibrating plate (11) to conduct electricity. Then, each of the connection terminals (2) has an outer end portion (3b) of the inner member (3) in which the inner end portion (3a) elastically contacts the respective predetermined portions of the piezoelectric vibrating plate (11). , Case body (1
The inner end portion (4a) of the outer member (4) penetrating through 2) and protruding to the outside is connected inside the case body (12). The outer member (4) has a predetermined size necessary for mounting. A piezoelectric buzzer characterized by having a thickness.