JPH0318400B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a diaphragm for a high-performance audio speaker made of a lightweight, high heat-resistant material that can withstand high-power mechanical vibrations.

(Prior Art and Problems) Among diaphragms for audio speakers, heat-resistant paper or cloth-based diaphragms have been used so far to withstand high-power mechanical vibrations. These materials are lightweight and have high performance, but even though they are heat-resistant, they are made of paper or cloth and have a limited heat resistance, and therefore cannot withstand high-power mechanical vibrations. Sex has its limits.

On the other hand, there is a great demand for high-power audio speakers, but it is difficult to satisfy this demand by significantly improving the current situation with conventional paper or cloth diaphragms, even if heat-resistant treatment is applied.

Therefore, the inventor of the present invention has repeatedly researched the selection of materials for the diaphragm from materials that are completely different from paper or cloth materials, and as a result, has introduced a completely new idea to the material of the diaphragm. This led to the present invention.

Conventional paper or cloth diaphragms are lightweight and are excellent materials that can provide high performance for audio speaker applications, and it is extremely difficult to find such lightweight, high-performance materials other than paper or cloth. It was hot. In other words, heat-resistant materials are metals,
Although it is possible to use ceramics, resins, etc., it is not possible to achieve weight reduction and high performance only by using ceramics, resins, etc. In order to make the diaphragm lightweight by using these materials such as metals, ceramics, and resins, it is possible to make the diaphragm dimensionally thinner, but this reduces the practical mechanical strength and also makes it difficult to withstand high-power mechanical vibrations. do not have. That is, none of these structures is suitable for a diaphragm for a high-power audio speaker.

(Means and effects for solving the problems) In view of the above points, the present invention provides a sintered body in which ceramic is sintered in the form of a woven fabric, and a porous body in which ceramic and metal powder are molded with heat-resistant resin. Another object of the present invention is to provide a diaphragm for a high-performance audio speaker that is lightweight and has improved durability against high-power mechanical vibration by using a porous composite of ceramic and metal by sintering.

(Example) Hereinafter, a diaphragm for an audio speaker according to the present invention will be described according to an example.

Example 1 Single-crystal or polycrystalline ceramic materials such as zinc oxide, potassium titanate, quartz glass, alumina, forsterite, etc. or raw materials thereof are sintered into a woven fabric to produce a cone-shaped sintered body or a cone-shaped sintered body as shown in FIG. A flat plate-shaped sintered body shown in FIG. 2 was prepared, and this sintered body was used as a diaphragm for an audio speaker. In this case, the method for obtaining a woven fabric-like sintered body is to first prepare a porous fabric-like body from resin, etc., impregnate it with slurry-like ceramic (or ceramic raw material), and then sinter it. There are ways to connect.

Since the audio speaker diaphragm of Example 1 is made of ceramic itself, it has sufficiently high heat resistance. Furthermore, since it is sintered into a woven fabric, it is lightweight and has great mechanical strength and vibration resistance.

Furthermore, since airtightness can be improved by resin coating, acoustic performance can be improved.

Example 2 Ceramic powder, nickel alloy powder, etc. or metal powder with pores similar to those in Example 1 above are mixed with 3 to 10% of a heat-resistant resin (e.g., silicone-based, polyamide-based, polyimide-based, triazine-based, or paraxylylene-based). ), mix well, and
The porous cone molded body shown in the figure or the porous flat plate molded body shown in Figure 2 is molded by curing resin, etc., and such porous molded body is used as a diaphragm for audio speakers. And so.

Since the audio speaker diaphragm of Example 2 contains metal, it has good thermal conductivity, improves the heat dissipation effect, and can withstand higher-power mechanical vibrations.

Example 3 The same ceramic powder (or raw material powder) and metal powder as in Example 1 were baked in nitrogen gas to form a cone-shaped porous composite shown in FIG. 1 or a flat plate-shaped porous composite shown in FIG. In conclusion, such a porous composite was used as a diaphragm for an audio speaker.

Since the audio speaker diaphragm of Example 3 also contains metal, it has good thermal conductivity, good heat dissipation, and can withstand higher-power mechanical vibrations.

In addition, for the purpose of improving the strength and vibration resistance of the sintered body shown in Example 1, the molded body of Example 2, or the porous composite body of Example 3, paper was added as shown in FIG. 3 or 4. , a sintered body of metal foil 2 such as cloth or aluminum foil,
It may be adhered to one or both sides of the molded body or porous composite body 1, and the sintered body,
It is also possible to have a structure in which a plurality of molded bodies or porous composite bodies 1 are stacked in layers.

Example 4 As shown in FIG. 5, a cone-shaped first diaphragm 3
was made of resin or paper, and the second diaphragm 5, which is the part to which the voice coil 4 is fixed, was made of the sintered body, molded body, or porous composite described in Examples 1 to 3.

According to the fourth embodiment, the parts that require the most heat resistance are made of members with high heat resistance, mechanical strength, and vibration resistance, so that the performance can also be improved.

(Effects of the Invention) As explained above, the audio speaker diaphragm of the present invention is lightweight, has high heat resistance, and can withstand high-power mechanical vibrations, so it is possible to improve the performance and downsize the speaker. Can be done.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing one example of the shape of each embodiment of the audio speaker diaphragm according to the present invention, FIG. 2 is a perspective view showing another example of the shape, and FIG. 3 is a sintered body, molded An enlarged cross-sectional view showing an example of a structure in which paper, cloth, or metal foil is adhered to one side of a body or porous composite;
Figure 4 shows a sintered body, molded body or porous composite, paper,
FIG. 5 is an enlarged sectional view showing an example of a structure in which a plurality of layers of cloth or metal foil are stacked together, and FIG. 5 is a sectional view for explaining Example 4. 1... Sintered body, molded body or porous composite, 2...
Paper, cloth or metal foil, 3, 5... diaphragm.

Claims (1)

[Claims] 1. A diaphragm for an audio speaker, characterized in that it is made of a sintered body obtained by sintering ceramic into a woven fabric. 2. The diaphragm for an audio speaker according to claim 1, wherein the entire surface or part of the sintered body is coated with a resin. 3. The diaphragm for an audio speaker according to claim 1, wherein paper, cloth, or metal foil is adhered to one or both sides of the sintered body. 4. The diaphragm for an audio speaker according to claim 1, wherein the sintered body is bonded in layers through paper, cloth, or metal foil. 5. A diaphragm for an audio speaker characterized by molding ceramic and metal powder into a porous body using a heat-resistant resin. 6. The diaphragm for an audio speaker according to claim 5, wherein paper, cloth, or metal foil is adhered to one or both sides of the porous body. 7. The diaphragm for an audio speaker according to claim 5, wherein the porous body is bonded in layers through paper, cloth, or metal foil. 8. A diaphragm for an audio speaker characterized by sintering ceramic and metal into a porous composite. 9. The diaphragm for an audio speaker according to claim 8, wherein paper, cloth, or metal foil is adhered to one or both sides of the porous composite. 10. The diaphragm for an audio speaker according to claim 8, wherein the porous composite is bonded in layers through paper, cloth, or metal foil.