JPS59877Y2 - piezoelectric buzzer - Google Patents

Description

[Detailed description of the invention] This invention relates to a piezoelectric buzzer that emits a buzzer sound by vibrating a piezoelectric element.In detail, it has a simple structure, is easy to assemble, and only generates the buzzer sound due to the pure piezoelectric element. The purpose is to

Conventionally, this type of piezoelectric buzzer has been constructed by attaching a piezoelectric element 2 to a disk-shaped metal resonant plate 1 as shown in FIG. 1 on the inner peripheral surface of a cylindrical resin case 3 as shown in FIG. By placing the lid in contact with the stepped portion 4 provided in the resin case 3, fixing the peripheral portion to the stepped portion 4 with adhesive, and attaching the lid body to the resin case 3 by fitting, gluing, welding, etc. It was configured.

By the way, in a piezoelectric buzzer having such a structure, the entire resin case 3 functions as a resonance box, so when the metal resonance plate 1 is attached to the resin case 3, if there is even a slight play in the mounting part, that play will be caused. This causes an abnormal sound and an unpleasant buzzer sound.

For this reason, in the conventional piezoelectric buzzer, the resin case 3 and the metal resonant plate 1 are fixed with adhesive as described above, but this has the drawbacks that assembly is troublesome, mass production is difficult, and the price is high. was.

Furthermore, if the adhesive strength between the metal resonant plate 1 and the resin case 3 is low, the metal resonator plate 1 will start to shake and produce abnormal noises when used for a short period of time.

The present invention is intended to eliminate such conventional drawbacks, and will be described below with reference to FIGS. 3 and 4 showing an embodiment of the present invention.

In the figure, 5 is a disk-shaped piezoelectric element, 6 is a bottomed metal cylinder, and the piezoelectric element 5 is attached to the inner bottom surface of this cylinder 6.

Reference numeral 7 denotes a cylindrical resin case that houses the cylindrical body 6. The resin case 7 has a stepped portion 8 on its inner peripheral surface and a through hole 9 in its bottom.

The cylindrical body 6 is placed with its peripheral edge in contact with the stepped portion 8 of the resin case 7, and the rising wall 6a of the cylindrical body 6 is held from above and below by the lid 10 of the resin case 7, so that the inside of the resin case 7 is not removed. installed on.

In addition, the lid body 10 can be fitted into the resin case 7 or heated.
It is attached by welding using ultrasonic waves, etc.

According to the piezoelectric buzzer of the present invention having the above configuration, the cylindrical body 6 with the piezoelectric element 5 attached to the bottom surface is fixed by sandwiching the rising wall 6a between the step part 8 of the resin case 7 and the lid body 10 from above and below. As a result, the cylindrical body 6 can be firmly attached, making it extremely difficult for looseness to occur, eliminating the generation of abnormal sounds other than pure buzzer sounds, and achieving high performance.

Further, the cylindrical body 6 can be fixed at the same time as the lid 10 is attached to the resin case 7, which is very effective for mass production and can reduce the cost.

As described above, the piezoelectric buzzer according to the present invention is easy to assemble, inexpensive, has high performance, and has very high practical effects.

[Brief explanation of the drawing]

Figure 1 is a perspective view showing a metal resonant plate of a conventional piezoelectric buzzer.
Fig. 2 is a sectional view showing the metal resonant plate attached to the resin case, Fig. 3 is a sectional view showing a voltage buzzer according to an embodiment of the present invention, and Fig. 4 is a sectional view showing the main components of the piezoelectric buzzer. FIG. 5...Piezoelectric element, 6...Cylindrical body, 6a
...Rising wall, 7...Resin case, 8
...Stepped portion, 10...Lid body.

Claims (1)

[Scope of utility model registration request] A metal cylindrical body with a bottom and a piezoelectric element attached to the bottom is housed in a cylindrical resin case, and the step part provided on the inner peripheral surface of the resin case and the lid of the resin case form the cylinder. A piezoelectric buzzer made by sandwiching the standing wall of the body from above and below.