JPH0457596A - Diaphragm for speaker - Google Patents

Abstract

PURPOSE:To obtain high reliability by using a natural silk fiber cloth for a base member and employing a thermal cross-linked type chlorosulfonated polyethylene resin for a coating agent. CONSTITUTION:A phenol resin whose a prescribed solid material is included to hold the shape is impregnated to a woven or unwoven cloth 1 of a natural silk fiber and a chlorosulfonated polyethylene resin whose viscosity and solid material are specified respectively is coated on one side to form a resin layer 2n which is shaped to be a dome. Then clear sound quality without a specific sound is realized and a rate of change in the property by means of the heat resistance and weather proof is reduced. Thus, a diaphragm for speaker with excellent reliability and high internal loss is realized.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a speaker diaphragm used in various types of audio equipment.

Conventional technology Conventional materials for dome-shaped diaphragms include molded metals such as aluminum and titanium, molded polymer materials such as polyarylate (Pum) and polyethylene terephthalate (PET), and chemical materials. There were fibers coated with rubber latex such as SBH.

Problems that the invention aims to solve Gold and 10,000 yen have high strength, but their specific gravity is high and the cost is high.

Polymeric materials have low rigidity and poor adhesion. In addition, chemical fibers coated with rubber latex have low heat resistance, so they cannot be used outdoors or in vehicles, where high reliability is required, and they are impregnated with a large amount of phenolic resin to prevent deformation due to temperature. Because of this, there was a shortcoming in that the hard characteristic sound of phenolic resin was produced.

The present invention aims to eliminate the above-mentioned deficiencies of the prior art and provide a speaker diaphragm with excellent reliability and high internal loss.

Precautionary Means to Solve the Problems In order to solve the above problems, the present invention is constructed by using natural polyethylene fibers as a base material and using d-thermal crosslinking type chlorosulfonated polyethylene index finger as a coating agent. be.

Function: By having the above structure, reliability such as heat resistance and abrasion resistance is greatly improved by the thermal cross-layer coating agent, and it can be used indoors, as well as in vehicles and outdoors. Furthermore, since the amount of phenol resin impregnated can be reduced by improving heat resistance, clear sound quality without characteristic sounds can be achieved.

Embodiment Hereinafter, a speaker imaging plate according to an embodiment of the present invention will be described with reference to the drawings.

As shown in Figure 1, natural silk fiber has a weight of 13 momme (approx. 48 g)
/m+) natural @fiber woven or nonwoven fabric 1 is impregnated with a phenolic resin of approximately 20% solids in an absolute dry weight of approximately 69 /rn' in order to maintain its shape, and is further viscous! Approximately 160CpS,
A coating resin layer 2 is formed on one side of chlorosulfonated polyethylene with a solid content of 20% at approximately 3 csg/m',
Molded into a dome shape.

The properties, heat resistance, and weather resistance of this coating agent are as follows.

That is, FIG. 2 shows the speaker diaphragm of the present invention and the S
Figure 3 shows the heat resistance test results of a conventional speaker diaphragm using BR at 100℃.
The results of a weather resistance test using a meter are shown.

From the above results, the present invention has significantly improved heat resistance and weather resistance compared to conventional products using SBR resin.

In addition, Young's modulus E due to temperature change of coating resin
and internal loss tanσ, as shown in FIGS. 4 and 5. Compared to conventional products using 5BRa fingers, the present invention exhibits less deterioration in Young's modulus and internal loss due to temperature.

The above base material was molded at a temperature of 190'C and a molding time of 15 seconds.
It was then molded into a dome shape as shown in Figure 1.

Due to the high heat resistance of the resin, the amount of phenol impregnated to maintain the molding can be reduced, achieving clear sound quality without the hard characteristic sound of phenolic resin.

Effects of the Invention Since the speaker diaphragm of the present invention is constructed as described above, it is possible to achieve clear sound quality without natural sound, and the rate of change in physical properties due to heat resistance and weather resistance is small. It is a dog with industrial value that can be used not only indoors but also outdoors and in cars.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of the speaker diaphragm of the present invention, and FIGS. 2 to 6 show the heat resistance, weather resistance, resin heat resistance, and damping of the present invention and conventional speaker diaphragms. FIG. 1...Natural silk fiber cloth, 2...Resin layer of phenol fingers and chlorosulfonated polyethylene. Name of agent: Patent attorney Shigetaka Awano and 1 other person

Claims (1)

[Claims] A speaker diaphragm formed into a dome shape by coating one or both sides of natural silk fiber cloth with phenolic resin and thermally crosslinked chlorosulfonated polyethylene resin.