JPH0844368A - Piezoelectric buzzer and its production - Google Patents

Abstract

PURPOSE:To make it possible to easily assemble this buzzer and to surely mount a terminal with a simple constitution. CONSTITUTION:A terminal mounting hole is formed at a cap 14 closing the aperture of a case body 10. The terminal 18, its mounting part 24 and a contact piece 20 are integrally molded of a metallic sheet for the terminal. This contact piece 20 is bent to one side and is so formed as to come into elastic contact with a piezoelectric diaphragm 16. The mounting part 24 is formed to a flat plate The mounting part 24 is formed with notches on both sides and is provided with a pair of tongue pieces 28 by louvering to a side opposite to the contact piece 20. The mounting part 24 is inserted into the mounting hole of the cap 14 and is elastically fixed by these tongue pieces 28. The mounting part 24 is held and fixed by melting the circumference of the mounting hole of the cap 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a piezoelectric buzzer incorporating a piezoelectric vibration element and driven at a predetermined frequency.

[0002]

2. Description of the Related Art In a conventional piezoelectric buzzer, a lead wire is provided between a terminal attached to a back cover of a case and a piezoelectric diaphragm, and the lead wire is soldered to apply a voltage to the piezoelectric diaphragm. In addition, in order to omit the soldering work,
No. 1518, a contact portion that comes into contact with the piezoelectric vibrating plate is provided integrally with the terminal, and a cut-and-raised tongue piece is provided at the center of the mounting portion of the terminal. It is proposed that a bent wing is provided, a terminal is fixed to the back cover by the tongue piece and the wing, and the contact portion is elastically brought into contact with the piezoelectric vibrating plate.

[0003]

In the case of the above-mentioned conventional technique, the work of soldering the lead wire to the piezoelectric vibrating plate requires a great number of man-hours, and this soldering work is troublesome especially in a small piezoelectric buzzer. there were. Further, as disclosed in the above publication, in which the contact portion is elastically brought into contact with the piezoelectric diaphragm, the soldering work is omitted,
Since the tongue piece and the wing must be provided in the terminal attachment part, the processing is troublesome, and since only one tongue piece is elastically held against the back lid, this tongue piece cannot be formed large, There is a problem of poor stability. Moreover, in order to hold the tongue and wing, a projection is formed in the mounting hole of the back cover, so the shape of the terminal mounting part of the back cover becomes complicated, and due to the molding die, the terminal projection part Since the mounting hole is formed wider than the width of the terminal, there is a drawback that rattling occurs in the terminal.

The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to provide a piezoelectric buzzer capable of securely attaching a terminal with a simple structure and a manufacturing method thereof. And

[0005]

The present invention is a method for manufacturing a piezoelectric buzzer in which a piezoelectric vibrating plate is housed in a case body, an opening of the case body is closed by a lid, and terminals are attached to the lid. , Forming a terminal mounting hole in the lid,
A contact piece elastically contacting the terminal, its mounting portion and the piezoelectric vibrating plate is integrally molded with a metal plate for a terminal, and the contact piece is bent to one side to form the mounting portion in a flat plate shape and both side portions thereof. A notch is formed on the opposite side of the contact piece to form a pair of tongue pieces, and the mounting portion is inserted into the mounting hole of the lid body, and the tongue piece elastically fixes the terminal to the lid body. Then, the periphery of the attachment hole of the lid body is melted to hold and fix the attachment portion, and the lid piece is attached to the opening portion of the case body, whereby the contact piece elastically abuts on the piezoelectric vibrating plate. This is a method for manufacturing a piezoelectric buzzer.

Further, according to the present invention, in a piezoelectric buzzer in which a piezoelectric vibrating plate is housed in a case body, an opening of the case body is closed by a lid, and a terminal is attached to the lid, a terminal mounting hole is provided in the lid. Form the terminal, its mounting portion, and the contact piece that comes into contact with the piezoelectric vibrating plate integrally with the metal plate for the terminal, bend the contact piece to one side, and form the mounting portion into a flat plate shape and both side parts thereof. A first and a second tongue piece which are cut and raised by forming a notch are provided, a part of an attachment portion between the tongue pieces is punched out, and a third tongue piece which is cut and raised on the opposite side of the pair of tongue pieces is provided. A tongue piece is formed, and the mounting portion of the terminal is inserted into the lid body to be elastically held by the tongue pieces, and the periphery of the mounting hole of the lid body is melted to hold and fix the mounting portion. Is a piezoelectric buzzer.

[0007]

According to the piezoelectric buzzer of the present invention, the terminal mounting portion is formed in a flat plate shape and is held and fixed in the mounting hole of the lid body by the pair of tongue pieces on both sides thereof. It is easy to install and is firmly fixed by welding. Further, the terminal mounting portion is formed in a flat plate shape, and the pair of tongue pieces on both sides of the terminal portion and the third tongue piece between them are elastically held and fixed in the mounting hole of the lid body to facilitate the formation of the terminal. In addition, it is designed to be fixed more securely.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 5 show a first embodiment of the present invention. In the piezoelectric buzzer of this embodiment, a sound emitting hole 12 is formed on the front side of a cylindrical case body 10, and the bottom surface of the case body 10 is open. The lid 14 is adhered or fitted and fixed to the bottom surface. The piezoelectric vibrating plate 16 is fixed inside the case body 10, and the terminal 1 is held by the lid 14.
The tip of the contact portion 20 of No. 8 is in contact with the piezoelectric vibrating plate 16. An attachment hole 22 is formed in the lid body 14, and the attachment portion 24 of the terminal 18 is inserted through the attachment hole 22 and is held and fixed. Then, as shown in FIG. 4, the vertical and horizontal widths of the terminal holding portion 23 at the center of the mounting hole 22 are formed to be substantially equal to the vertical and horizontal dimensions of the cross section of the terminal 18 so that rattling does not occur in the terminal. There is. The contact portions 21 on both sides of the terminal mounting hole 22 are formed to have a width smaller than that of the terminal holding portion 23.

The terminal 18, the contact portion 20, and the mounting portion 24 are integrally formed of a terminal-forming metal plate such as phosphor bronze.
Is formed by making a crease in a longitudinal direction in order to increase bending strength and the like, and the mounting portion 24 provided at the base end portion of the terminal 18 is formed in a flat plate shape. Furthermore, the mounting portion 24
The contact portion 20 provided subsequent to is bent at a predetermined angle from the lid 14 so as to come into contact with the piezoelectric vibrating plate 16, and is further bent in the attached state to elastically come into contact with the piezoelectric vibrating plate 16. The mounting portion 24 is formed in a flat plate shape, and cutouts 26 are formed on both sides thereof in the direction of the terminal 18, and a pair of tongue pieces 28 formed outside the cutouts 26 are opposite to the bending direction of the contact piece 20. It is cut and raised to the side. Further, slopes 25 are formed on both side surfaces of the mounting portion 24 so as to guide the terminals 18 when they are inserted into the mounting holes 22.

The terminal 18 is mounted by inserting the terminal 18 and the mounting portion 24 from the inside of the lid 14 into the mounting hole 22 formed in the lid 14 in the protruding direction of the terminal 18. Then, in the terminal 18, the tongue piece 28 of the mounting portion 24 elastically contacts the contact portion 21, and the mounting portion 24 is elastically biased to one side and fixed. Further, after the terminal 18 is mounted, the resin around the entrance of the mounting hole 22 on the diaphragm side is melted to form a melted portion 27, and the mounting portion 24 is securely held and fixed.

In the piezoelectric buzzer of this embodiment, the terminal 18 is integrally formed with the mounting portion 24 and the contact piece 20, and the pair of tongue pieces 28 of the flat mounting portion 24 allows the terminal 18 to be easily and securely covered. 14 is held and fixed, and the contact piece 20 ensures contact with the piezoelectric vibrating plate 16. Moreover, terminal 18
Is securely held in the mounting hole 22 and has no rattling.

Next, a second embodiment of the present invention will be described with reference to FIGS. Here, the same members as those in the above-described embodiment are designated by the same reference numerals and the description thereof will be omitted. The tongue piece 2 is attached to the mounting portion 24 of the terminal 18 of this embodiment.
A third tongue piece 30 formed by punching out the attachment portion 24 between 8 is formed by cutting and raising on the side opposite to the tongue piece 28, and together with the tongue piece 28 in the attachment hole 22 of the lid body 14. The terminal 18 is held elastically and reliably. Further, convex portions 32 with which a pair of tongue pieces 28 engage are formed on both abutting portions 21 of the mounting hole 22 of the lid body 14, and by simply inserting the mounting portion 24 of the terminal 18 into the mounting hole 22,
The attachment and fixing of the terminal 18 is completed.
In addition, slopes 34 are provided on both sides of the mounting portion 24,
It is formed so as to guide when it is inserted into the attachment hole 22. Further, the width of the terminal holding portion 23 of the mounting hole 22 is formed to be equal to the width of the terminal 18, and
Since the terminal 18 is formed to have a length that holds the chevron portion, the terminal 18 after attachment is prevented from rattling.

Also in the method of mounting the terminal 20 of this embodiment, the terminal 18 and the mounting portion 24 are inserted from the inside of the lid body 14 in the protruding direction of the terminal 18 and the tongue piece 28 of the mounting portion 24 is mounted in the mounting hole as in the above embodiment. Engagement with the convex portion 32 of 22 completes the attachment. According to this embodiment, the terminal 18 can be stably attached by the third tongue piece 30, and the number of attachment steps can be further reduced. Further, the convex portions 32 are provided on the abutting portions 21 on both sides of the mounting hole 22, and even if the vertical and horizontal widths of the terminal holding portion 23 and the vertical and horizontal widths of the terminals 18 are formed to be substantially equal, there is a problem in molding. Rather, rattling of the terminal 18 inserted into the mounting hole 22 can be reliably prevented.

The terminals of the piezoelectric buzzer of the present invention are not limited to those in the above embodiment, the number of tongues is not limited to 2 or 3, and the tongues may be formed in any desired direction. It is a thing.

[0015]

According to the piezoelectric buzzer of the present invention, the terminal mounting portion is formed in the shape of a flat plate and the tongue pieces are provided on both sides of the plate so that the terminal can be elastically mounted in the mounting hole of the lid body. The man-hours and the mounting man-hours can be greatly reduced. Furthermore, since the mounting part is flat,
The mounting space may be small, and the pair of tongues reliably and elastically holds the mounting hole. Further, by melting the mounting hole and providing the third tongue piece, the terminal can be reliably fixed to the lid, and the number of assembling steps can be greatly reduced.

[Brief description of drawings]

FIG. 1 is a perspective view showing a terminal of a first embodiment of the present invention.

FIG. 2 is a schematic vertical sectional view of the piezoelectric buzzer of the first embodiment.

FIG. 3 is a left side view of the terminal of the above embodiment of the present invention (A).
It is a front view (B).

FIG. 4 is a front view of a lid body into which the terminals of this embodiment are inserted.

5 is a partial cross-sectional view taken along the line AA in which the case body is attached to the lid body of FIG.

FIG. 6 is a left side view (A) and a front view (B) showing a terminal of a second embodiment of the present invention.

FIG. 7 is a plan view of a mounting hole according to the second embodiment.

8 is a cross-sectional view taken along the line AA of FIG.

FIG. 9 is a bottom view of the mounting hole of the second embodiment.

10 is a sectional view taken along line BB of FIG.

[Explanation of symbols]

 10 Case Main Body 14 Lid 16 Piezoelectric Vibration Plate 18 Terminal 20 Contact Part 22 Mounting Hole 24 Mounting Part 28, 30 Tongue Piece

Claims (2)

[Claims] 1. A method of manufacturing a piezoelectric buzzer in which a piezoelectric vibrating plate is housed in a case body, an opening of the case body is closed by a lid, and a terminal is attached to the lid, and a terminal mounting hole is formed in the lid. Then, a contact piece elastically contacting the terminal and its mounting portion and the piezoelectric vibrating plate is integrally molded with a metal plate for a terminal, and the contact piece is bent to one side to form the mounting portion in a flat plate shape and A pair of tongues are formed by forming notches on both sides and cutting and raising on the opposite side to the contact piece, and the mounting portion is inserted into the mounting hole of the lid body, and the terminal is elastically covered by the tongue piece. The contact piece is elastically fixed to the piezoelectric vibrating plate by melting the periphery of the mounting hole of the lid body and holding and fixing the mounting portion, and mounting the lid body in the opening portion of the case body. A method of manufacturing an abutting piezoelectric buzzer. 2. A piezoelectric buzzer in which a piezoelectric vibrating plate is housed in a case body, an opening of the case body is closed by a lid, and a terminal is attached to the lid, and a terminal mounting hole is formed in the lid. The contact piece that contacts the terminal, its mounting portion, and the piezoelectric vibrating plate is integrally molded with the metal plate for the terminal, and the contact piece is bent to one side, and the mounting portion is formed in a flat plate shape, and notches are formed on both sides thereof. The first and second tongue pieces that are formed and cut and raised are provided, and a third tongue piece that is cut and raised on the side opposite to the pair of tongue pieces by punching out a part of the attachment portion between the tongue pieces. And a mounting portion of the terminal is inserted into the lid body and elastically held by the tongues, and the periphery of the mounting hole of the lid body is melted to hold and fix the mounting portion. Piezoelectric buzzer.