JPH0723495A - Sub cone for speaker - Google Patents

Abstract

(57) [Summary] [Objective] Regarding a speaker subcone used in various audio equipment, it solves the problems of high distortion, poor heat resistance and weather resistance, and can exhibit excellent performance. The purpose is to provide. [Structure] A polyester fiber 1 is used as a base material, a titanium layer 2 is provided on the surface by a sputtering method, and a chlorosulphonated polyethylene resin 3 is coated, so that the internal loss of the base material is high and the rigidity is increased. Therefore, distortion can be reduced, and heat resistance and weather resistance can be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speaker sub-cone which is attached to the upper surface of the center of a diaphragm of a speaker used in various audio equipment and is mainly used for reproducing a high sound range.

[0002]

2. Description of the Related Art A conventional speaker subcone of this type will be described with reference to the drawings.

FIG. 4 is a perspective view showing the structure of a conventional speaker sub-cone. The material is a metal such as aluminum or titanium, or a polymer material such as polyarylate (PA) or polyethylene terephthalate (PET), and nylon. Chemical fibers such as polyester are impregnated with a phenol resin for shape retention and then coated with rubber latex such as SBR and NBR, and pulp are available. These base materials are molded into a predetermined shape using a molding die. Then, the speaker sub-cone 5 was constructed.

[0004]

However, in the above-mentioned conventional structure, when a metal is used as the material of the speaker subcone 5, the rigidity of the speaker subcone 5 is increased and the high-frequency limit frequency can be improved. Although,
Since the specific gravity is high, the sound pressure in the output sound pressure frequency characteristic of the speaker is low, and the distortion is large due to the low internal loss, and the cost is the highest.

Further, when the polymer material is used, the rigidity of the speaker sub-cone 5 is low, so that the high frequency limit frequency is lowered, and the characteristic sound peculiar to the polymer material is generated, and the adhesiveness is poor. However, there was a problem that quality issues remained.

When a base material coated with a rubber latex after impregnating a chemical fiber with a phenol resin is used, the high limit frequency is low and the heat resistance is low because the rigidity of the speaker subcone 5 is low. Because of this, it cannot be used for outdoor or in-vehicle applications that require high reliability. Further, since a large amount of phenol resin is impregnated to prevent deformation due to humidity, there is a drawback that a hard characteristic sound peculiar to the phenol resin is generated during sound quality reproduction.

Further, when pulp is used, the rigidity of the speaker sub-cone 5 is low, so that the high-frequency limit frequency is low, and the pulp itself has a hygroscopic property, so that the physical properties are not stable. .

An object of the present invention is to solve the above-mentioned conventional problems and to provide a speaker sub-cone capable of exhibiting excellent speaker performance.

[0009]

In order to solve the above-mentioned problems, a speaker sub-cone according to the present invention is provided with a metal layer on one or both sides of a chemical fiber by a sputtering method and then impregnated with a phenol resin. Alternatively, it is formed by heating and molding a base material having both surfaces coated with a heat-crosslinking resin a plurality of times into a predetermined shape.

[0010]

With this configuration, the chemical fiber used as the base material of the speaker sub-cone has a much higher internal loss than that of the metal material or the polymer material, and therefore the strain can be reduced. Further, by coating the surface of the chemical fiber with a metal, the rigidity is increased, and the high limit frequency can be improved. Also, by coating with a heat-crosslinking resin, the reliability of heat resistance, weather resistance, moisture resistance, etc. is greatly improved, and it can be used not only indoors but also outdoors and in-vehicle. Furthermore, since the amount of impregnation of the phenol resin can be reduced by improving the heat resistance, it is possible to reproduce clear sound quality without eigen sound.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A speaker subcone according to an embodiment of the present invention will be described below with reference to the drawings. Figure 1 is a perspective view showing the configuration of Supikasa for Bukon according to the invention, after providing the titanium layer 2 having a thickness of about 1000Å by sputtering on one surface of the polyester fiber (unit weight of about 45 g / m ²⁾ 1, the shape In order to maintain the content, a phenol resin having a solid content of about 20% was impregnated with an absolute dry weight of about 5 g / m ² and a viscosity of about 1
Chlorosulfonated polyethylene resin 3 having 50 CPS and a solid content of about 20% was coated three times to give a coating weight of about 35 g / m ² . However, when the base material was made of natural fiber (silk, cotton, etc.), the water absorption rate of the base material was high, and therefore variations occurred when the titanium layer 2 was formed, and the physical properties were not stable.

The physical properties of the above coating agent (chlorosulfonated polyethylene resin 3) are shown in Table 1.

[0013]

[Table 1]

In addition, in (Table 1), the conventional product shows the data of the SBR resin, and it can be seen from this (Table 1) that the invention product has improved tensile strength.

The heat resistance of the above coating material is shown in FIG.
FIG. 3 shows the weather resistance, and it can be seen from FIGS. 2 and 3 that the heat resistance and the weather resistance of the invention product are significantly improved as compared with the conventional SBR resin.

Furthermore, the titanium layer 2 surface-coated by the sputtering method has an amorphous structure, and this amorphous is also called an amorphous material.
It has the following features as compared with the crystal structure type of general metals. (1) High mechanical strength and excellent toughness. (2) It has high hardness. (3) Excellent corrosion resistance.

Therefore, the speaker sub-cone 4 according to the present invention has a structure having high internal loss of the polyester fiber 1 of the base material and high rigidity due to the titanium amorphous coating formed on the surface of the base material.

The above base material was molded into a shape shown in FIG. 1 at a molding temperature of 190 ° C. for a molding time of 15 seconds to form a speaker subcone 4. Due to the high internal loss of the base material and the high heat resistance of the resin, it is possible to reduce the impregnated amount of the phenol resin for shape retention, so it is possible to reduce the hard characteristic sound peculiar to the phenol resin. Further, the high rigidity of the coating layer on the surface can improve the high frequency limit frequency and realize clear sound quality.

[0019]

As described above, since the speaker sub-cone according to the present invention is configured, it is possible to realize clear sound quality without eigen sound, and further, it is possible to improve the high frequency limit frequency by the surface coating. In addition, since it is possible to reduce the rate of change of physical properties due to special environments such as heat resistance and weather resistance, it can be used not only indoors but also outdoors and in-vehicle applications. Great value.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a configuration of a speaker subcone according to an embodiment of the present invention.

FIG. 2 is a characteristic diagram showing heat resistance of a coating material used for the speaker sub-cone according to the example.

FIG. 3 is a characteristic diagram showing weather resistance of a coating material used for the speaker subcone according to the example.

FIG. 4 is a sectional view showing a configuration of a conventional speaker subcone.

[Explanation of symbols]

 1 Polyester fiber 2 Titanium layer 3 Chlorosulfonated polyethylene resin 4 Subcone

Claims (1)

[Claims] 1. A speaker subcone formed by forming a metal layer on one or both sides of a resin film by a sputtering method, impregnating a phenol resin, and then heat-molding a base material coated with a heat-crosslinking resin into a predetermined shape. .