JPH0222698A - Production of piezoelectric buzzer - Google Patents

Abstract

PURPOSE:To easily bend a terminal without the positional deviation of the bending part to improve the workability of assembling by providing the stage where a terminal member between rear covers obtained by a resin molding is cut to a proper length and the stage where a notched part is used to bend the cut terminal member. CONSTITUTION:Terminal members A and B are arranged in parallel in a rear cover forming mold with a prescribed gap between them to form plural rear covers. Thereafter, the terminal member placed between rear covers 2 and 2' is cut into individual parts. With respect to the formed article after the end of this cutting stage, two terminals 3 and 4 are provided which are stood on the thick part of the rear cover 2 and has both sides extended to the outside. One side A1 of projected sides of the terminal 3 is bent into a V shape toward the side of a bowl-shaped projecting part 2B with the notched part as the boundary, and the other projected side A2 is bent at 90 deg. in the opposite direction with the notched part as the boundary. Thus, it is unnecessary to position bending parts again, and terminals are easily bent.

Description

[Detailed description of the invention] [Purpose of the invention] (Industrial application field) The present invention relates to a method for manufacturing a piezoelectric buzzer.

(Prior Art) The present inventors previously proposed a piezoelectric buzzer (not shown) manufactured using a back cover formed by integrally molding a terminal and a back cover as shown in FIG. Gansho 63-35949
).

In the same figure, first, terminal members C and D made of two long metal plates are arranged in parallel and put into a back cover molding die (not shown), and then they are placed at a predetermined interval to form the above-mentioned shape. A plurality of back covers (12, 12', . . . ) are molded. After that, each back cover 12. The terminal member located between '12' is cut into individual parts. In the molded product after completing this cutting process, two
A molded article with book terminals 13, 14 is obtained. Incidentally, terminal exposure notches 12E, 12E are provided on the front and back surfaces of the bottom portion of the back cover 12, extending near the circumferential surface. Thereafter, each terminal member is bent to form a terminal with the notch 12E as a boundary.

A piezoelectric buzzer was manufactured by attaching the integrally molded back cover 12 to a case (not shown) having a sound emitting hole and mounting a piezoelectric diaphragm.

(Problem to be Solved by the Invention) However, in the method of manufacturing the device previously proposed with the above configuration, the terminals CI, C2 integrally molded with the back i12
, Dt, and D2, the position of the bent portion may shift, so it is necessary to position and press the folding portion to bend it, resulting in a problem that assembly work takes time.

The present invention has been made to solve the above-mentioned problems, and provides a method for manufacturing a piezoelectric buzzer in which the bending part does not shift, the terminal can be easily bent, and assembly workability is improved. The purpose is to provide

[Structure of the Invention] (Means for Solving the Problems) In order to solve the above problems, the present invention provides a case having a sound emission hole, a piezoelectric vibration plate supported within the case, and a piezoelectric vibration plate. A method for manufacturing a piezoelectric buzzer comprising a supporting @ lid and a terminal supported by the back lid and having one end temporarily in contact with the piezoelectric sensor, the step of arranging terminal members made of a plurality of elongated metal plates in parallel, the metal plates A step of making cuts at predetermined intervals on one surface, a step of applying resin molding, a step of cutting the terminal member between the back covers obtained by the resin molding to an appropriate length, and a step of cutting the cut terminal member as described above. This feature includes a step of bending using the cut portion.

(Function) Since the terminal member has a concave cut, there is no need to reposition the bent part after integrally molding the back cover and the terminal.
The concave cut allows the terminal to be easily bent.

(Example) The present invention will be specifically explained below with reference to Examples.

FIG. 1 is a sectional view showing an embodiment of a piezoelectric buzzer manufactured by the manufacturing method of the present invention. This piezoelectric buzzer is case 1. The case back 2 is fitted into the opening of the case 1. It is composed of a piezoelectric element 6 fixed on a metal plate 5 installed in the case 1 and two terminals 3 and 4 implanted by integral molding on the back M2. The metal plate 5 and the piezoelectric element 6 constitute a piezoelectric diaphragm.

The case 1 is made of a synthetic resin material in the shape of a cylinder with a bottom, has a sound emitting hole 7 in the center of the bottom, and has a thick inner peripheral surface on the bottom side.
It has a stepped surface that is thinner on the opening side, and has a protruding portion 1A projecting toward the opening side on this stepped surface, and a fitting groove 1B on the thinner portion on the opening side.

The back cover 2 is made of a bowl-shaped synthetic resin material, and has a fitting protrusion 2A on its outer peripheral surface that can be fitted into the fitting groove 1B of the case, and a protrusion 2B on the opening edge. There is. This camera back 2
A metal terminal 3.4 is integrally molded and implanted in the holder. The outward protruding side of each of these terminals 3.4 is linear, and the back cover opening side is bent into elastic contact ends 3A, 4A so as to be pressed into contact with a metal plate 5 or an electrode of a piezoelectric element 6, which will be described later. Contact protrusions 3B, 4B are formed at the tips of the elastic contact ends 3A, 4A. The terminal in this embodiment has two bent portions 4C and 4D inside @M2. Also, regarding the terminal 3, there are two similar bent portions 3C,
3D (see FIG. 3(C)).

The metal plate 5 to which the piezoelectric element 6 is fixed is placed on the stepped protrusion 1A inside the case with the piezoelectric element 6 side facing the opening side of the case 1, and the back M2 facing the opening side of the case 1. Insert from the respective fitting grooves 1B and fitting protrusions 2.
It is designed to be sandwiched between the opening edge protrusion 2B and the opening edge protrusion 2B when they are fitted together via A. In this way, the metal plate 5
is supported in line contact between the case 1 and the protrusions 1A and 2B of the back N2.

Next, an example of a method for manufacturing the piezoelectric buzzer will be described with reference to FIGS. 2 to 6.

First, with reference to FIG. 3, the case of obtaining an integrally molded product of the back cover 2 and the terminals 3 and 4 will be described.

As shown in FIG. 3(A), concave cuts 3E, 3F, 4E, 4F for forming the bent portions 3C, 3D, 4G, 4D are formed in the terminal members A, B in advance, and the cuts 3E, In the middle of 3F, there is a concave cut 3G to prevent misalignment, and in the same way, there is a cut 4E.

Terminal members A and B are made from long metal plates with a cut 4G in the middle of 4F. This concave cut 3E, 3F
, 4E, 4F are formed concavely on the surface of the terminal members A, B having a thickness T as shown in FIGS. 4(A) and 4(B) in the same direction as the bending direction. 3G, 4G
is the notch 3F.

The number of pieces formed in the same direction as 4F and molding the back cover,
It is formed on the terminal members A and B.

FIG. 3(B) is a plan view showing a state in which the back cover 2 is molded by injection molding, and the molding order is such that first, the terminal members A and B are arranged in parallel, and a mold for molding the back cover (not shown) is used. ), and mold a plurality of back covers (2, 2', . . . ) having the shape described above at predetermined intervals. Thereafter, the terminal member located between each back cover 2, 2' is cut into individual parts. In the molded product after this cutting process, two terminals 3 are implanted in the thick part of the back cover 2 and extend outward on both sides.
．． A molded product containing 4 is obtained. Note that the bottom front and back surfaces of the back M2 are provided with terminal exposure notches 2D, 2D extending near the circumferential surface, and the concave notches 3E, 3F, 4E, 4F.
are set up to prevent them from being planted. This will be the cut 3E in the next step.

This is to facilitate the terminal bending process using 3F, 4E, and 4F. The depth of this bent portion is from the surface (or back surface) of the back cover bottom plate to the terminal embedded portion, and must not penetrate through the bottom plate.

Moreover, the said position shift prevention concave cut 3G.

4G is implanted in the back N2.

Next, as shown in FIG. 3(C), one of the protruding sides of the terminal 3, on the A1 side, is connected to the bowl-shaped protrusion 2 of the back cover 2, with the notch as the border.
Bend it into a V shape (3) by the concave cut 3F on the B side
D) and process it so that its tip is on the center line, and process the other protruding side A2 to the opposite surface with the notch as the border.
0” angle by the concave cut 3F (3c
)do.

Among the bent ends, the illustrated upper end 3A becomes the piezoelectric element contact end,
The opposite side becomes the orthogonal protruding end side.

Similarly to the above, for the terminal 4, as shown in FIG.
Process to form 4D to form metal plate contact @4A and upright protruding end.

Incidentally, the contact curved surface may be formed by a press or the like in consideration of the portion to be cut during the process shown in FIG. 3(B).

As shown in FIG. 2, a case is formed by injection molding in the same manner as described above, and has a sound emitting hole 7 at the center of the bottom surface, a stepped protrusion 1A at the lower part of the inner peripheral surface, and a fitting groove 1B at the upper part. Form 1. Further, the piezoelectric element 6 is bonded onto the metal plate 5 using an anaerobic adhesive or the like.

After that, the metal plate 5 to which the piezoelectric element 6 is fixed is placed on the internal stepped protrusion 1A of the case 1, and the back cover 2 is pushed in from the opening side of the case 1 by applying pressure.
The fitting protrusion 2A of the back cover 2 is closely fitted into the fitting groove 1B, and the two are airtightly assembled. At this time, the outer peripheral surface of the metal plate 5 is held between the stepped protrusion 1A of the case 1 and the protrusion 2B of the back M2 in a line contact state.

In addition, since the terminals 3 and 4 are installed eccentrically with respect to the center line on the back M2 when viewed from the front in FIG. 2, the relationship between the two is as shown in 3 and 4 in FIG. The dark contact state between the piezoelectric element 6 and the metal plate 5 is such that the tip of one terminal 3 contacts only the piezoelectric element 6, and the tip of the other terminal 4 contacts only the metal plate 5, as shown in FIG. It turns out.

(The hatched part in the figure is the contact surface).

In the above embodiment, when forming the back cover and the terminal by pair molding, the bent portion 3G for forming the terminal of the terminal member
, 3D, 4G, 4D with concave cuts 3E, 3F, 4E
, 4F makes it easier to bend the terminal.

In addition, the concave notches 3G and 4G to prevent misalignment are provided on the back cover 2.
Since it is planted inside, there is no misalignment. In general, a plurality of displacement-preventing concave notches may be provided, and the direction in which they are installed is not limited. Furthermore, although this embodiment has proposed a device with two terminals, it goes without saying that this embodiment can be similarly applied even if the number of terminals increases depending on the intended use of the piezoelectric buzzer.

[Effects of the Invention] According to the present invention described in detail above, in the manufacturing method in which the terminal and the back cover are formed by integral molding, the terminal member is provided with an intermediate portion between the bent portion for forming the terminal and the bent portion. By providing the step of making the incisions in advance, there is an effect that the terminal can be easily bent without having to newly position and press it after the back cover is molded. Thereby, a piezoelectric buzzer manufacturing method with improved assembly workability can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a piezoelectric buzzer obtained by the method of the present invention, Fig. 2 is an exploded perspective view of the above device, and Fig. 3 is a schematic diagram for explaining the manufacturing method of integrally molding the terminal and the back cover. In the figure, (A) is a plan view of the terminal, (B) is a plan view of the terminal and back cover integrally molded, and (C) and (D> show the method of bending the terminal. Schematic diagram, FIGS. 4(A) and 4(B) are cross-sectional views of the terminal member in which notches are formed, FIG. 5 is a perspective view showing the arrangement of the terminals, and FIG. 6 is a state of contact between the terminals and the piezoelectric element. The plan view and FIG. 7 are plan views for explaining the manufacturing method of integrally molding the terminal and the back cover as proposed above. 1... Case, 2... Back cover, 3, 4...・Terminal, 3
C, 3D, 4C, 4D... bending part, 3E, 3F, 3G
, 4E, 4F, 4G...Concave notch, 5...Metal plate, 6...Piezoelectric element, 7...Sound emission hole.

Claims (1)

[Claims] A piezoelectric buzzer comprising a case having a sound emission hole, a piezoelectric diaphragm supported within the case, a back cover supporting the piezoelectric diaphragm, and a terminal supported by the back cover and having one end in contact with the piezoelectric diaphragm. The manufacturing method includes a step of arranging terminal members made of a plurality of elongated metal plates in parallel, a step of making incisions at predetermined intervals on one side of the metal plate, a step of applying resin molding, and a step of forming a back side obtained by the resin molding. A method for manufacturing a piezoelectric buzzer, comprising the steps of cutting a terminal member between a lid and a back cover to an appropriate length, and bending the cut terminal member using the cut portion.