JPS6040622B2 - piezoelectric buzzer - Google Patents

Description

[Detailed description of the invention] This invention relates to a piezoelectric buzzer.

A follow-up example is shown in Figure 1. That is, in the figure,
1 is a piezoelectric buzzer main body, 2 is a resonant cylinder part, 3 is a diaphragm, 4 is a piezoelectric element, 5 is a printed circuit board, and 6 is an electronic component.The assembly of this buzzer is as follows: After bonding the diaphragm 3 with the piezoelectric element 4 attached thereto and wiring it, the printed circuit board 5 is attached to the main body 1. In operation, the piezoelectric element 4 is vibrated by supplying current to the electronic component 6, and the diaphragm 3 is vibrated, causing resonance cylinder section 2 to resonate.
By the way, the diaphragm 3 has its vibration nodes 3a as shown in FIG.
is made so that it can be positioned at the upper edge of the resonance cylinder section 2.

However, because it was extremely difficult to accurately position the diaphragm 3 and adhere it to the upper edge of the resonance tube 2, the sound pressure due to the diaphragm 3 was lower than the design, and there were also variations from product to product. There was a drawback that it occurred. Therefore, an object of the present invention is to provide a piezoelectric buzzer in which a diaphragm can be accurately positioned and fixed to a resonance cylinder.

An embodiment of this invention is shown in FIGS. 3 to 5.

That is, in this piezoelectric buzzer, three guide ribs 11 are integrally formed on the stepped portion 10' between the side wall portion 8 of the main body 7 and the resonance tube portion 9, and the peripheral edge of the diaphragm 3 is guided and supported by the guide ribs 11. Then, the diaphragm 3 is glued to the upper part of the resonance tube part 9, and three holes 13 are formed in the printed circuit board 12, and the printed circuit board 12 is attached to the main body 1, so that guide ribs are formed in the holes 13. 1 1 is engaged to open the guide rib 11 , thereby removing the contact between the guide rib 11 and the diaphragm 3 . Because of this configuration, the diaphragm 3 and the resonance cylinder section 9 are connected to the guide rib 1.
1, the upper part of the resonance tube part 9 can be adhered to the node part of the diaphragm 3.

Moreover, by attaching the printed circuit board 12 after using adhesive,
Since the contact between the guide rib 11 and the diaphragm 3 is separated, the vibration of the diaphragm 3 is not affected. As described above, in the crimp buzzer of the present invention, the diaphragm is positioned by the guide lip and bonded to the resonance tube, and the contact between the guide rib and the diaphragm is separated by the gunwale of the printed circuit board, etc., so that the diaphragm This has the effect that the resonant tube and the resonant cylinder are accurately positioned and bonded, and there is no variation from product to product.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the conventional example, Fig. 2 is a partial view thereof, Fig. 3 is a perspective view of the main body of an embodiment of the present invention, Fig. 4 is a sectional view thereof, and Fig. 5 is its printed circuit board mounting. It is a sectional view of the state. 3...Diaphragm, 7...Body, 9...
... Resonance cylinder part, 11 ... Guide rib, 12.
...Printed circuit board (extension component). Figure 1 Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] 1 A buzzer main body, a resonance cylinder provided on the buzzer main body, a plurality of guide ribs erected on the buzzer main body and arranged around the resonance cylinder, and a plurality of guide ribs guided by the plurality of guide ribs. A piezoelectric buzzer comprising: a diaphragm positioned and bonded to the upper edge of a resonance cylinder; and an expansion member attached to the buzzer body for expanding the guide ribs and separating them from contact with the diaphragm.