JPH075520Y2 - Piezoelectric buzzer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a piezoelectric buzzer.

(Prior Art) The inventors previously proposed the piezoelectric buzzer shown in FIG. (Practical application Sho 63-35949, Real open flat 1-1393) This piezoelectric buzzer 20 includes a case 11, a lid 12 fitted into the opening of the case 11, and a metal plate 15A mounted in the case 11.
It is composed of a piezoelectric element 15B fixed on the top and two terminals 13 and 14 which are planted in the lid 12 by integral molding. Piezoelectric vibrating plate with metal plate 15A and voltage element 15B
15 are composed.

The case 11 is made of a bottomed tubular synthetic resin material, has a sound output hole 16 in the center of the bottom surface, and the bottom side is thicker on the inner peripheral surface.
The opening surface side has a step surface that becomes thin, the step surface has a protruding portion 11A protruding toward the opening side, and the opening side thin portion has a fitting groove 11B and a tip portion 11C. .

The lid 12 is made of a bowl-shaped synthetic resin material, has an outer peripheral surface having a fitting convex portion 12A that can be fitted into the fitting concave groove 11B of the case 11, and has a protruding portion 12B at the opening edge. ing. This lid 12
Metal terminals 13 and 14 are planted by integral molding in the. Each of the terminals 13 and 14 is linear on the outward protruding side, and the lid opening surface side is elastic contact ends 13A and 14A bent so as to be pressed into contact with the electrodes of the metal plate 15A and the piezoelectric element 15B described later. At the tip of each of the elastic contact ends 13A and 14A, a contact protrusion 1
3B and 14B are formed. The terminals of the piezoelectric buzzer 20 have two bent portions (14C, 14D) inside the lid body 12.

Further, the fitting convex portion 12A of the lid 12 and the fitting concave groove 11B of the case 11 form a fitting mechanism portion of the piezoelectric buzzer 20.

The metal plate 15A to which the piezoelectric element 15B is fixed is the piezoelectric element 15B.
Is placed on the step protrusion 11A inside the case with the side facing the opening side of the case 11, and the lid 12 is fitted from the opening side of the case 11 to the respective fitting concave grooves 11B and the fitting It is designed to be sandwiched between the protrusion 12A and the opening edge protrusion 12B when fitted together. Metal plate in this way
15A is adapted to be supported in line contact between the case 11 and the projecting portions 11A and 12B of the lid 12.

In the piezoelectric buzzer 20 having the above structure, when the lid 12 is fitted into the case 11, the fitting convex portion 12A of the lid 12 is the case 1
The opening end 11C of 1 is expanded and fitted into the fitting recess 11B of the case 11. In this case, the more the contact surface between the fitting projection 12A and the opening end 11C, the more difficult it is to fit,
Strong mating force is required.

Further, when the opening end portion 11C of the case 11 is expanded, the fitting groove 11B may be cracked or damaged.

(Problems to be Solved by the Invention) As described above, in the piezoelectric buzzer having the above-described configuration, a strong fitting force needs to be applied to fit the lid body and the case, which is a difficult and time-consuming task. is there.

Further, there is a problem that the fitting groove of the case is cracked or damaged during the fitting work.

The present invention has been made to solve the above problems, and provides a piezoelectric buzzer capable of fitting a lid to a case with a weak fitting force and without causing cracking or damage of the case. To aim.

[Means for Solving the Problems] (Means for Solving the Problem) The present invention has a cylindrical case having a sound output hole and containing a piezoelectric vibrating plate therein, and a terminal fitted to the opening end side of the case. A lid body provided, a fitting concave groove provided on the inner circumference of the case, and a fitting convex portion provided on the outer circumference of the lid body, and the fitting convex portion is fitted into the fitting concave portion, In a piezoelectric buzzer provided with a fitting mechanism section for contacting a terminal with a piezoelectric vibrating plate, an inclined surface section having a diameter that decreases from the opening end side of the case to the fitting groove side is provided,
The fitting convex portion of the lid body is discontinuous along the peripheral surface of the lid body.

(Operation) According to the piezoelectric buzzer having the above-described configuration, the inclined surface portion having a diameter that decreases from the opening end side of the case to the fitting concave groove side is provided, and the fitting convex portion of the lid body has a discontinuous shape. Therefore, when the lid body is fitted to the case, the contact area of the fitting convex portion of the lid body with respect to the case inner peripheral region reaching the fitting convex groove through the inclined surface portion of the case, there is no inclined surface portion, And,
This is less than in the case of the conventional example in which the fitting projections are not formed in a discontinuous shape, which allows the lid body to be fitted into the case with a weak fitting force, and the force acting on the inner circumference of the case is also weakened. It can eliminate cracks and damages.

(Example) Hereinafter, the present invention will be described in detail with reference to an example.

Since the piezoelectric buzzer of the present invention shown in FIG. 1 is almost the same as the piezoelectric buzzer shown in FIG. 5, here, the fitting force buffering portion which is the difference will be mainly described. Also, the same parts are designated by the same reference numerals.

FIG. 2 is an enlarged sectional view of a schematic portion of the case 11 according to the embodiment of the present invention.

In the case 11 shown in the figure, an inclined surface portion 1 is formed as a fitting force buffering portion inside the opening tip portion 11C, and above it, a slanting surface portion 1A is closely attached to a fitting convex portion 12A formed on the outer peripheral surface of the lid body. A fitting groove 11B for fitting is formed, and these fitting protrusions 1
The fitting mechanism portion is constituted by 2A and the fitting groove 11B. Further, a protruding portion 11A that sandwiches the piezoelectric vibrating plate 15 with a protruding portion 12B provided on the lid 12 is formed above it.

The operation of the piezoelectric buzzer 10 of the first embodiment having the above structure will be described with reference to FIGS. 1 and 2. When fitting the lid 12,
First, the inclined surface portion 1 inside the opening tip portion 11C of the case 11
The fitting projection 12A on the outer peripheral surface of the lid body 12 is smoothly abutted on the cover 12 without any obstacle. Next, apply appropriate force to the fitting projection 12A.
Is fitted into the fitting groove 11B. At that time, the convex portion 12A
Moves smoothly on the inclined surface portion 1 even if a fitting force weaker than the conventional one is applied. Further, since the inclined surface portion 1 is formed, the distance T at which the inner peripheral surface of the case and the fitting convex portion 12A are forcibly brought into contact with each other becomes short. Can work together.

FIG. 3 is a schematic plan view of the lid in this embodiment.

In the lid body 12 shown in the figure, the fitting projections 2 (2A, 2B, 2C) having an angle of 90 ° from the center on the outer peripheral surface thereof have an interval 3 (which has an angle of 30 °. 3A, 3B, 3C), and the fitting protrusion 2 having such a discontinuous shape functions as a fitting force buffering portion that weakens the fitting force of the lid 12 to the case 10.

With the above configuration, the lid 12 is attached to the case 10
At the time of fitting, the contact surface between the inner peripheral surface of the opening tip portion 11C and the fitting convex portion 2 is reduced due to the space 3, and the fitting work can be easily performed with a smaller fitting force than the conventional one.

Further, the present invention is not limited to the above embodiment, and various modifications can be made. For example, the shape of the inclined surface portion in the above embodiment may be formed by an inclined surface portion in which a part of the fitting groove is cut out as shown in FIG. 4 (a), or as shown in FIG. 4 (b). Further, one end of the inclined surface portion may be formed from the edge of the fitting concave groove, and further, the inclined surface portion may be formed by cutting out a part of the fitting concave groove as shown in FIG.

Further, in the above embodiment, the number and intervals of the fitting projections formed in the discontinuous shape of the lid are not limited to those shown in FIG.

[Advantage of the Invention] According to the present invention described in detail above, the action of the inclined surface portion and the discontinuous fitting convex portion allows the lid body to be fitted into the case with a weaker fitting force than the conventional example, and the case is not cracked or damaged. It is possible to provide a piezoelectric buzzer that can also prevent the above.

[Brief description of drawings]

1 is a sectional view of a piezoelectric buzzer according to an embodiment of the present invention, FIG. 2 is a schematic enlarged sectional view of a case according to the embodiment of the present invention, and FIG. 3 is a schematic plan view of a lid according to the embodiment of the present invention. 4 (a), (b), and (c) are schematic enlarged sectional views showing modifications of the inclined surface portion in the embodiment of the present invention,
FIG. 5 is a sectional view of the previously proposed piezoelectric buzzer. 1 ... Inclined surface (fitting force buffer), 10 ... Piezoelectric buzzer,
11 …… Case, 11B …… Mating groove, 11C …… Open end,
12 ... Lid, 12A ... Mating projection, 13,14 ... Terminal, 15 ...
… Voltage diaphragm, 16 …… Sound emission hole.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Hiroshi Ikeda Hiroshi Ikeda 1-13-1 Nihonbashi, Chuo-ku, Tokyo TDC Corporation (56) References 63-105376 (JP, U) Actual 63 -131500 (JP, U) Actual development Sho-58-26177 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. A cylindrical case having a sound output hole and containing a piezoelectric vibrating plate inside thereof, a lid provided with a terminal fitted to the opening end side of the case, and provided on the inner circumference of the case. And a fitting mechanism portion for fitting the fitting convex portion into the fitting concave portion to bring the terminal into contact with the piezoelectric vibrating plate. In a piezoelectric buzzer including, an inclined surface portion having a diameter that decreases from the opening end side of the case to the fitting concave groove side is provided, and the fitting convex portion of the lid body is discontinuous along the peripheral surface of the lid body. Piezoelectric buzzer characterized by having a shape.