JPS593675Y2 - piezoelectric buzzer - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a piezoelectric buzzer with a simple structure and high acoustic conversion efficiency.

Conventionally, various piezoelectric buzzers using piezoelectric element diaphragms have been devised.

Various piezoelectric buzzers have also been devised in which the acoustic conversion efficiency of the piezoelectric element diaphragm is increased.

FIG. 1 shows the first embodiment, in which the upper surface 2' of the piezoelectric element diaphragm 2 is pressed against the inner end 1' of the resonator cylinder 1, and the elastic support 4 is attached to the bottom plate 3' of the case 3. is pressed against the lower surface 2'' of the piezoelectric element diaphragm 2, and the lower surface 2'' of the piezoelectric element diaphragm 2 is elastically supported by the bottom plate 3' of the case 3.

However, this case is case 3. Piezoelectric element diaphragm 29
Four components are required, consisting of the elastic support 4 and the bottom plate 3', and the elastic support 4 is attached to the bottom plate 3' using adhesive to hold the elastic support 4 in the center of the bottom plate 3'. The disadvantage was that it required work to be bonded.

FIG. 2 shows a second embodiment of the conventional piezoelectric buzzer, in which the tip of a protrusion 5' provided around the inside of the case 5 presses against the upper surface 2' of the piezoelectric element diaphragm 2, and the conductive ring 6 presses against the lower surface 2'' of the piezoelectric element diaphragm 2, the conductive ring 6 is placed on a support 7, and the support 7 is fixed to the bottom plate 8 of the case 5.

However, this one has a piezoelectric element diaphragm 2, a case 5,
It requires five components, consisting of the conductive ring 6, support 7, and bottom plate 8, and also requires work to fix the conductive ring 6 to the support 7 and the support 7 to the bottom plate 8 using adhesive. There was a drawback.

This invention was devised in view of the problem of slanting, and it simplifies the structure by phase-setting the components of the piezoelectric buzzer, facilitates assembly, and increases the acoustic conversion efficiency of the piezoelectric element diaphragm. It is.

Hereinafter, preferred embodiments of the piezoelectric buzzer according to the present invention will be described in detail with reference to FIGS. 3 and 4.

9 is a case, which includes a resonance chamber 10, a sound emission hole 11, and a stepped portion 1.
It has 2.

The resonance chamber 10 communicates with a sound emission hole 11, and a stepped portion 12 is carved on the periphery of the resonance chamber 10.

Reference numeral 13 denotes an O-ring, which is inserted so as to be in contact with the stepped portion 12.

Reference numeral 14 denotes a piezoelectric element diaphragm, which is inserted into the stepped portion 13 so that its front surface 14' is in pressure contact with the O-ring 13, and after the insertion is completed, its back surface 14 is held by a claw 15 formed on the case 9 by thermal caulking. “is supported.

Therefore, the piezoelectric element diaphragm 14 is elastically attached to the stepped portion 12 via the O-ring 13.

Thus, the external force exerted by the claws 15 on the piezoelectric diaphragm 14 is reduced, and the sound conversion efficiency of the piezoelectric diaphragm 14 can be increased by making it airtight with the O-ring 13.

In particular, the present invention can be constructed from three members: the case 9, the O-ring 13, and the piezoelectric element diaphragm 14, which simplifies the construction and does not require adhesive, making it easy to assemble and suitable for mass production.

Furthermore, the space on the back side of the piezoelectric element diaphragm can be used effectively.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a first embodiment of a conventional piezoelectric buzzer;
FIG. 2 is a sectional view showing a second embodiment of a conventional piezoelectric buzzer;
FIG. 3 is a sectional view showing a preferred embodiment of the piezoelectric buzzer according to the present invention, and FIG. 4 is a bottom view of the piezoelectric buzzer according to the third embodiment. 9... Case, 10... Resonance chamber, 11
... Sound emission hole, 12 ... Stepped part, 13 ...
...OIJ, 14...Piezoelectric element diaphragm, 14...Surface of piezoelectric element diaphragm, 14''...
...Back side of piezoelectric element diaphragm, 15...nail.

Claims (1)

[Scope of utility model registration request] a piezoelectric element diaphragm, an O-ring that presses against the surface circumference of the piezoelectric element diaphragm, a resonance chamber provided with a sound emission hole, a step carved in the circumference of the resonance chamber, and an O-ring connected to the step. A piezoelectric buzzer comprising: a ring and a claw into which a piezoelectric diaphragm is inserted and which supports the back surface of the piezoelectric diaphragm; and a case integrally provided with the resonance chamber, step, and claw.