JPS6312636Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a piezoelectric sounding body used for speech synthesis, television receivers, radio receivers, etc., for generating audio music.

Conventional Structures and Their Problems In recent years, piezoelectric elements have become thinner, which has enabled them to reproduce a wide range of frequencies, and they have come to be used as speakers in audio equipment, wireless equipment, etc.

However, in the conventional piezoelectric sounding body, as shown in FIG. 1, the outer edge 3a of the piezoelectric element 3, which is made by bonding a piezoelectric element 1 to a thin metal plate 2, is directly bonded to a frame 4 made of synthetic resin with an adhesive. Or, it was fixed with silicone rubber (not shown) to allow it to vibrate freely. In the figure, 5 and 6 are lead wires for applying input voltage. When this piezoelectric sounding body is attached to an audio device or the like, the vibration of the piezoelectric element 1 is transmitted to the frame 4, causing chatter, which causes serious problems in sound quality and low sound pressure. This is because not only adhesives but also silicone rubber have a high adhesive strength and a thin adhesive layer, so it is not possible to make the piezoelectric element 3 vibrate freely enough, and the piezoelectric element 3
This is because the vibrations cannot be sufficiently absorbed at the outer edge 3a of the frame 4, and the vibrations are transmitted to the frame 4, producing a chattering sound and further reducing the sound pressure.
Furthermore, since the frame 4 itself does not have a cushioning material, there is a drawback that chattering noise is generated.

Purpose of the invention In view of the above points, an object of the present invention is to provide a piezoelectric sounding body that can improve the sound quality and raise the sound pressure.

Structure of the Invention In order to achieve this object, the piezoelectric sounding body of the present invention has an elastic supporting base adhesively fixed to one side of the outer edge of the piezoelectric element, and a buffer body fixed to the inner edge of the piezoelectric element. The support base is fixed with a slight gap provided between the outer periphery of the element and the inner periphery of the buffer. According to this configuration, the vibration of the piezoelectric element is absorbed by the support base and is not transmitted to the frame, so that no chattering noise is generated. Further, since the support base has elasticity, the piezoelectric element element can freely vibrate without being restrained by the support of the outer edge, and high sound pressure can be achieved. Furthermore, even if the frame is subjected to vibrations due to sound pressure, the shock absorber prevents the vibrations from being transmitted to the equipment to which the piezoelectric sounding body is attached, and no chattering noise is generated.

An embodiment of the present invention will be described below with reference to Fig. 2 and Fig. 3. In the figures, 7 is a piezoelectric element, 8 is a thin metal plate, and 9 is a vibration plate, which are bonded together to form a piezoelectric element 10. 11 is the piezoelectric element 1.
1 is a support base having elasticity and made of foamed synthetic resin, low-hardness rubber, sponge, etc., which is adhesively fixed to one side of the outer edge of the piezoelectric element 10, and this support base 11 is adhesively fixed to a frame 12 made of metal or synthetic resin. 13 is a buffer body made of foamed synthetic resin, soft paper, etc., which is fixed to the inner edge of the frame 12, and a small gap is provided between the inner circumference of this buffer body 13 and the outer circumference of the piezoelectric element 10 so that they do not come into direct contact.
are lead wires connected to the piezoelectric element 7 and the metal plate 9 for applying an input voltage.

Then, by applying an audio input between the lead wires 14 and 15, the piezoelectric element 10 vibrates with the support base 11 at a node or a diameter smaller than the node, and generates sound.

Effects of the Invention According to the piezoelectric sounding body of the present invention configured as described above, the vibration of the piezoelectric element is absorbed by the support base and is not transmitted to the frame, so that no chattering noise is generated. Furthermore, since the material of the support base is made of elastic foamed synthetic resin, rubber, etc., the piezoelectric element can freely vibrate without being restrained by the support of the outer edge, and high sound pressure can be obtained. Furthermore, even if the frame is subject to vibration due to sound pressure, when it is attached to a device, the shock absorber prevents the vibration from being transmitted to the device. No chattering noise is generated. Therefore, according to the present invention, a piezoelectric sounding body that can eliminate chattering noise and also secure high sound pressure can be obtained.

Note that the present invention can also be applied to a device that does not have a diaphragm and uses a piezoelectric element consisting only of a piezoelectric element and a thin metal plate, in which case the sound pressure will decrease somewhat and the sound will change, but Basically, the same effects as those described above can be obtained.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of a piezoelectric sounding body in a conventional example.
FIG. 2 is a top view showing an embodiment of the piezoelectric sounding body according to the present invention, and FIG. 3 is a sectional view thereof. 7... Piezoelectric element, 8... Thin metal plate, 9... Vibration plate, 10... Piezoelectric element element, 11... Support stand, 12... Frame, 13... Buffer.

Claims (1)

[Scope of utility model registration request] A piezoelectric element, an elastic support base to which the outer edge of the piezoelectric element is adhesively fixed, a frame to which the elastic support base is fixed, and a cushioning material located on the outer periphery of the elastic support base and fixed to the frame. A piezoelectric sounding body having.