JPH04289896A - Assembly of piezoelectric buzzer - Google Patents

Abstract

PURPOSE:To reduce the cost of raw material of a metal case, reduce the final external size easily and obtain an assembly method for a piezoelectric buzzer free from poor sound pressure. CONSTITUTION:In a method of assembling a pie 20 electric buzzer comprising a metal plate 2 on which a piezoelectric sounding body 1 is provided and a pair of metal cases 3 and 4 surrounding both front and rear surface of the metal plate 2 are provided, the outer peripheries of the metal cases 3 and 4 are arranged in positions opposed to each other on both the front and back sides of the metal plate 2 respectively by sandwiching outer peripheries of the metal plate 2. Then these outer peripheries are connected to each other by resistance welding.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of assembling a piezoelectric buzzer.

0002

2. Description of the Related Art Conventionally, as shown in FIG. 2, this type of piezoelectric buzzer includes a piezoelectric sounding body 1 such as a bimorph vibrator, and a metal plate 2 on which the piezoelectric sounding body 1 is disposed and functions as its electrode and support plate. A device is known that includes a pair of metal cases 3 and 4 surrounding both the front and back sides of the case, that is, a front case 3 and a back case 4 made of aluminum. Note that the reference numeral 5 in the figure is a lead wire, and each of these is connected to an electrode (not shown) formed on the surface of the piezoelectric sounding body 1 and the metal plate 2, and also passes through the front case 3. and is pulled out to the outside.

[0003] In this piezoelectric buzzer, the piezoelectric sounding body 1 is first pasted on one side of the metal plate 2 using a predetermined adhesive (not shown). After each of the cases 4 is sequentially attached and stored in the front case 3, the outer periphery of the front case 3, which has a larger external shape, is bent to wrap around the outer periphery of the back case 4, and these outer peripheries are bent. An assembly method is used in which the parts are caulked together and integrated.

0004

By the way, in the method of assembling the piezoelectric buzzer described above, the outer peripheries of the front and back cases 3 and 4 are caulked together to integrate them. Aluminum, which has good flexibility, must be used as the material for the piezoelectric buzzer, which not only increases the material cost, but also causes the caulked part of the assembled piezoelectric buzzer to protrude outward. This has caused the inconvenience of increased external dimensions. Furthermore, although caulking is performed using a press machine, it is not always possible to obtain good and uniform caulking pressure, and there is also a risk that insufficient caulking pressure may result in poor sound pressure in the piezoelectric buzzer. .

The present invention was devised in view of these inconveniences, and it is possible to reduce the material cost of the metal case and easily reduce the final external dimensions. The object of the present invention is to provide a method for assembling a piezoelectric buzzer that does not cause poor sound pressure.

[0006]

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a piezoelectric buzzer comprising a metal plate on which a piezoelectric sounding body is disposed, and a pair of metal cases surrounding both the front and back sides of the metal plate. This assembly method is characterized by arranging the outer periphery of the metal case at the front and back positions facing each other with the outer periphery of the metal plate in between, and then connecting these outer peripheries to each other by resistance welding.

[0007]

[Function] According to the above structure, the outer shapes of the metal plate and the metal case on which the piezoelectric sounding body is disposed need only be large enough to allow their outer peripheral edges to face each other, and in the case of caulking. Unlike the piezoelectric buzzer, the external dimensions of the assembled piezoelectric buzzer do not protrude outward and become larger. Additionally, since there is no need to bend and caulk the outer edge of the metal case, there is no need to consider flexibility when selecting the material for the metal case, and it is now possible to use steel products as the material for the metal case. Become.

[0008]

Embodiments Hereinafter, embodiments of the present invention will be explained based on the drawings.

FIG. 1 is a sectional view showing the schematic structure of a piezoelectric buzzer assembled using the assembly method according to this embodiment. The overall structure of this piezoelectric buzzer is basically the same as that of the conventional example, so parts and portions in FIG. 1 that are the same or corresponding to those in FIG. 2 are given the same reference numerals.

This piezoelectric buzzer is formed of a metal plate 2 on which a piezoelectric sounding body 1 is disposed, and a pair of metal cases 3 and 4 surrounding both the front and back sides of the metal plate 2, that is, an inexpensive SPCC (cold rolled steel plate) or the like. The metal plate 2, the front case 3, and the back case 4 each have an outer shape set in advance to be approximately the same size.

[0011] In the method of assembling this piezoelectric buzzer, first, the piezoelectric sounding body 1 is pasted on one surface of the metal plate 2 using a predetermined adhesive (not shown), and then,
The outer peripheries of the front and back cases 3 and 4 are arranged at the front and back positions facing each other with the outer periphery of the metal plate 2 interposed therebetween, and these outer peripheries are connected to each other by resistance welding. It goes without saying that the voltage required for resistance welding can be obtained more stably than the caulking pressure in the conventional example.

0012

As explained above, in the method for assembling a piezoelectric buzzer according to the present invention, the outer periphery of the metal case is attached to each of the front and back positions, which are opposite to each other across the outer periphery of the metal plate on which the piezoelectric sounding body is disposed. are arranged, and their outer peripheral edges are connected by resistance welding. Therefore, the outer shapes of the metal plate on which the piezoelectric sounding body is arranged and the metal case need only be large enough to allow their outer edges to face each other. The external dimensions of the device will no longer protrude outward and become larger.

Furthermore, since there is no need to bend and caulk the outer peripheral edge of the metal case, SP can be used as the material for the metal case.
As a result of being able to use steel products such as CC, material costs can be reduced. Furthermore, since the metal plate and metal case are joined by resistance welding, more stable quality can be obtained compared to caulking.
Another advantage is that there is no risk of causing poor sound pressure of the piezoelectric buzzer.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing a schematic structure of a piezoelectric buzzer assembled using the assembly method according to the present embodiment.

FIG. 2 is a sectional view showing a schematic structure of a piezoelectric buzzer assembled using a conventional assembly method.

[Explanation of symbols]

1 Piezoelectric sounding body 2 Metal plate

Claims (1)

[Claims] Claim 1: A metal plate (2) on which a piezoelectric sounding body (1) is arranged, and a pair of metal cases (
3, 4), in which the outer periphery of the metal case (3, 4) is placed at each of the front and back positions facing each other across the outer periphery of the metal plate (2), and
A method for assembling a piezoelectric buzzer characterized by connecting these outer peripheral edges together by resistance welding.