JPS6024054Y2 - piezoelectric speaker - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a piezoelectric speaker that utilizes piezoelectric effects to generate voices, musical tones, and the like.

Recently, there has been a strong push to make electronic devices equipped with speakers, such as radios and speech synthesis devices, thinner, but it is difficult to make the built-in electrodynamic speakers thinner, This has become a major obstacle.

Moreover, electrodynamic speakers have a complex structure and require a large number of manufacturing steps, making it difficult to manufacture them at low cost.

Furthermore, there are various restrictions on incorporating electrodynamic speakers into equipment, and there is also the problem that handling is troublesome.

The present invention was developed in view of the above-mentioned conventional technical situation, and aims to provide a piezoelectric speaker that can be constructed thinly, is easily manufactured, is extremely easy to handle, and also has a simple waterproof function. Embodiments will be described below in detail with reference to the drawings.

In FIG. 1, reference numeral 1 denotes an annular frame, and a vibrating membrane 2 is stretched on one side of the frame 1 so as to cover an opening on one side.

The vibrating membrane 2 may be integrally formed with the frame 1 by resin molding.

A disc-shaped piezoelectric sounding body 3 is concentrically bonded onto a vibrating membrane 2 within a frame 1.

The sounding body 3 has a piezoelectric ceramic plate 5 bonded to a diaphragm 4,
The lead wire is connected.

If the diaphragm 4 is conductive, the lead wire is connected to the diaphragm 4 and the outer electrode of the piezoelectric ceramic plate 5. If the diaphragm 4 is insulative, the lead wire is connected to the inner electrode of the piezoelectric ceramic plate 5 by folding it back to the outside. connected to.

A frame 1 in which a sounding body 3 is provided on a vibrating membrane 2 in this way
Resin 6 is injected inside.

The resin 6 is made of a resin material that is elastic and has a certain degree of sound absorption function, such as silicone rubber.

In the above embodiment, when a signal is applied to the sounding body 3 through the lead wire, the sounding body 3 causes bending vibration, and this vibration causes the vibrating membrane 2 to vibrate, and an audible sound is emitted from the vibrating membrane 2.

At this time, since the injected resin 6 is made of a material that is elastic and has a certain degree of sound absorbing function, the vibration of the sounding body 3 is not significantly inhibited.

In addition, since the resin 6 is also injected onto the sounding body 3,
The resonance peak of the sounding body 3 is suppressed, and the frequency characteristics become flat.

Furthermore, since the sounding body 3 is covered with the vibrating membrane 2 and the injected resin 6, a simple waterproof function can be obtained.

Furthermore, it can be attached to equipment relatively freely without any restrictions.

In the above embodiment, the sounding body 3 is bonded to the diaphragm 2, but the sounding body 6 may be fixed to the diaphragm 2 with injected resin 6 without bonding.

Further, the sounding body 6 may be composed of the piezoelectric ceramic plate 5 alone, in which case bending vibration occurs between the piezoelectric ceramic plate 5 and the vibrating membrane 2.

Since the present invention is constructed as described above, it can be manufactured thinly and easily, is extremely easy to handle, and can also be provided with a simple waterproof function.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the piezoelectric speaker of the present invention. 1... Frame, 2... Vibration membrane, 3.
...Sounding body, 6...Injection resin.

Claims (1)

[Scope of utility model registration request] A piezoelectric speaker characterized in that a vibrating membrane is provided to cover an opening on one side of an annular frame, a piezoelectric sounding body is provided on the vibrating membrane in the frame, and resin is injected into the frame.