JPH11234796A - Damper for speaker and speaker using it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a damper for a speaker applied to various electroacoustic transducers with excellent forming performance at its forming, high durability and excellent quality stability and to provide the speaker using it. SOLUTION: A base is formed of a cloth of double-layered strings 9 consisting of a polyester fiber core 7 in the middle and a cotton fiber surface layer 8 to enhance contraction of the base. The damper is formed in a desired shape by heat treatment to reduce an internal stress of the damper for the speaker. Thus, even when external heat is delivered to the damper after forming, the form maintainability is high and deformation is reduced. Then the speaker damper and the speaker using it are provided, which enhance excellent effects in the reliability such as durability against heat and moisture-resistance.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speaker damper used for various kinds of audio equipment and a speaker using the same.

[0002]

2. Description of the Related Art A conventional speaker damper will be described with reference to FIG.

Reference numeral 2 denotes a magnetic circuit, and reference numeral 6 denotes a diaphragm coupled to a voice coil 4 fitted in a magnetic gap 3 of the magnetic circuit 2 and having an outer periphery coupled to a frame 5.
Reference numeral 1 denotes the voice coil 4 connected between the voice coil 4 connected to the inner periphery of the diaphragm 6 and the frame 5 and
And a corrugation provided from the inner periphery to the outer periphery.

Conventionally, as a material of the speaker damper 1, a plain woven fabric using cotton yarn, aramid fiber yarn, phenol fiber yarn, or a blended yarn thereof is used as a matrix, and phenol resin, melamine A prepreg impregnated with a thermosetting resin such as a resin was used as a base material, and the base material was formed into a desired shape in a heating mold and used as a speaker damper 1.

[0005]

However, in the above-mentioned conventional speaker damper 1, the shaping material is a thermosetting resin and is cured by a heating reaction in a predetermined heating mold. The woven fabric is made of natural fiber cotton fabric and heat-resistant fiber aramid fiber and phenol fiber in the form of a matrix as described above. Was held.

In the molding in the heating mold, the molding temperature is usually set at a high temperature of 180 ° C. or higher in order to shorten the molding time. Due to the high rigidity, there has been a problem that a predetermined shape cannot be maintained due to the internal stress and often deformed.

Further, when incorporated in a speaker, the extruded material covering the surface of the matrix fabric is subjected to repeated bending or bending deformation, and the above-mentioned excipient material is a chemical fiber constituting a fabric, for example, aramid fiber as a heat-resistant fiber. Is difficult to impregnate due to poor compatibility with the woven fabric. There has also been a problem in terms of durability as a speaker member that it is broken and the rigidity as a speaker damper is significantly reduced.

Further, since the fiber constituting the base material has extremely low elasticity, depending on the shape of the speaker damper to be molded, for example, a material having a high rise on the outer periphery of the corrugation portion may have wrinkles or material during molding. There is also a problem in terms of stability of the quality of the speaker damper, which causes overlap and affects the flexibility of the speaker damper.

As a method for solving these problems, a method is used in which a woven fabric made of thermoplastic fiber is used as a base material, and the base material is formed into a desired shape in a heating mold and used as a speaker damper. However, since a phenol resin, a melamine resin or the like is used as a shaping material, the mold temperature is usually set to 180 ° C. or higher during molding,
Some of the constituent thermoplastic fibers are melted or deformed by heat during molding, and due to the properties of the thermoplastic fibers forming the base material, there is a limit in heat resistance, and it is used for speakers with high input resistance. The speaker damper has a problem in durability against generated heat.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, and provides a speaker damper having good moldability at the time of molding, high durability, and excellent quality stability, and a speaker using the same. The purpose is to do so.

[0011]

In order to solve the above-mentioned problems, a speaker damper according to the present invention comprises a single-layer or multi-layer yarn having a central portion made of chemical fibers and a surface made of natural fibers. The cloth made of the raw yarn obtained by twisting is subjected to a resin treatment on the base material, and is formed into a desired shape by a heat molding treatment.The internal stress of the woven fabric remains due to the elasticity of the base material itself. Almost no, furthermore, because the multi-layer structure yarn in which the center part of the core is a chemical fiber and the surface is a natural fiber, the chemical fiber which is the center part does not directly contact the high-temperature mold at the time of molding. There is no deterioration of the core such that a part of the thermoplastic fiber is melted or deformed by the heat during molding, and it is easy to maintain almost the specified shape when removed from the mold after molding Formability that causes deformation The present invention also solves the problems related to the above, and because it is composed of the yarn having good elongation as described above, the elongation can also solve the problem in terms of durability as a speaker damper. .

Further, since the surface layer is made of natural fibers, the excipient is easily impregnated, the degree of freedom of the flexibility is increased, and the adhesiveness is also superior.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION The invention according to claim 1 of the present invention relates to an original yarn obtained by twisting a single layer or two or more multi-layer yarns having a central core made of chemical fiber and a surface made of natural fiber. The fabric made of yarn is subjected to a resin treatment on a base material, and is formed into a desired shape by a heat molding treatment, and the internal stress of the woven fabric hardly remains due to the elasticity of the base material itself. Since the core of the part is made of chemical fiber and the surface is made of natural fiber, the chemical fiber which is the core of the central part does not directly contact the high temperature mold at the time of molding, the deterioration of the core is suppressed, and it was taken out from the mold after molding In some cases, it is easy to hold a substantially predetermined shape and solve the problem of moldability that causes deformation. In addition, since it is composed of a raw yarn having good extensibility as described above, a speaker In terms of durability as a vehicle damper In which it can be solved.

According to a second aspect of the present invention, the substrate according to the first aspect is formed by at least flat knitting, rubber knitting, pearl knitting,
It is formed by either knitting of double-sided knitting, the internal stress of the woven fabric does not remain due to the elasticity of the knitting, and the predetermined shape is extremely easily retained when taken out from the mold after molding. In addition to solving the problem related to moldability that causes deformation, the durability as a speaker member is also improved due to the elasticity.

According to a third aspect of the present invention, there is provided a magnetic circuit, a voice coil having an inner periphery fitted in a magnetic gap of the magnetic circuit, and an outer periphery coupled to the voice coil and a frame. 3. The diaphragm according to claim 1, wherein the diaphragm is coupled between the voice coil and the frame to support the voice coil, thereby improving the performance of the speaker damper. Thus, it is possible to provide a speaker for high quality and high input resistance.

An embodiment of a speaker damper according to the present invention will be described below with reference to FIGS. 1, 2 (a) and 2 (b).

(Embodiment 1) FIG. 1 is a perspective view of a cross section of a main part for explaining the structure of a yarn which is a main part of a speaker damper of the present invention, and FIG. 2 (a) is a plain weave which is the main part. FIG. 2B is a perspective view of another flat-knitted base material.

First, the structure of the yarn used in the present embodiment will be described with reference to FIG. According to the figure, reference numeral 7 denotes a core provided at the center, which is formed of polyester fiber, and 8 is a surface layer covering the core 7, which is formed of cotton fiber.

Next, the base material 10, the base material 11, and the base material for comparison formed by using the yarn 9 as a raw yarn will be described.

The base material 10 is composed of the above-mentioned yarn 9 as a raw yarn, a core 7 (polyester fiber) of 30%, a surface layer 8 (cotton fiber) 70
2% yarn (equivalent to 20th count)
A plain weave woven fabric having a weft and warp density shown in (a) of 38 yarns / inch was produced.

The base material 11 is composed of the above-mentioned yarn 9 as a raw yarn, a core 7 (polyester fiber) of 30%, a surface layer 8 (cotton fiber) 70%.
% Using a two-layer structure yarn (equivalent to 40th count)
A flat knitted fabric having a weft density of 40 threads / inch and a warp density of 35 threads / inch shown in (b) was produced.

Using a 20th cotton yarn as a base material for comparison,
Plain weave fabric with a weft and warp density of 38 lines / inch (conventional base material for speaker damper, same structure as Fig. 2 (a))
Was prepared.

Next, each of the base materials 10 and 11 is impregnated with 15% by weight of a phenol resin to prepare a prepreg, cut into a predetermined size, and formed around a periphery of the base materials 10 and 11 by a clamper having a circular portion having a diameter of 80 mm. Hold about 200
5 kg at a pressure of ² kg / cm ² in a predetermined mold heated at
After performing heat molding for 2 seconds and opening the mold, the clamper is released, the molded product is taken out, the outer shape is cut, and the outer diameter is 62 m.
m, a donut-shaped speaker damper having a neck diameter of 19 mm was produced.

With respect to the performance of each speaker damper obtained in this manner, the flexibility was adjusted to a certain flexibility by setting the displacement under a load of 50 g to 0.7 mm.

Next, formability (lifting of the damper when placed on a flat plate immediately after fabrication of the speaker damper) Elongation rate (%) Drawing rate when corrugation width as a speaker damper is fixed (%) (Change in the speaker damper flexibility after standing in an atmosphere of 85 ° C. for 250 hours (fo), and assembling it into the speaker (diameter 16 cm) of FIG. 3 to ensure durability (white noise with a rating of 20 W and 90 Hz). 2
Rate of change in flexibility after continuous application for 50 hours (fo) Moisture resistance (Rated 2 in an atmosphere of 55 ° C. and 95% humidity)
After a white noise of 0 W and 90 Hz was continuously applied for 500 hours, the change rate (fo) of the speaker damper flexibility was measured. The measurement results are shown in (Table 1).

[0026]

[Table 1]

As is evident from Table 1, the substrates 10 and 11 are slightly superior in moldability, remarkably superior in elongation (%) and reduction (%), as compared with the comparative substrate. It has been confirmed that it is excellent in processability (substrates 10 and 11 can be deep drawn at least three times or more than the comparative substrate), and when incorporated in a speaker, it becomes a speaker damper that can follow large amplitudes. Was.

It was also confirmed that excellent effects were obtained in terms of durability (rate of change in flexibility) and moisture resistance.

As described above, the loudspeaker damper of the present embodiment has a base made of a fabric made of a raw yarn composed of a two-layer yarn composed of a polyester fiber having a center portion made of polyester fiber and a surface made of cotton fiber. Increased the degree of stretching of the substrate,
The fact that the internal stress at the time of molding was reduced and that the polyester fiber also covered the cotton fiber around the center core,
This is probably because the influence during molding with the mold was reduced.

It was also confirmed that in order to further reduce the internal stress at the time of molding, it is possible to obtain more effects by using a knitted substrate instead of a woven fabric.

That is, the elongation (%) of the knitted base material 11 in the vertical, horizontal, and 45-degree oblique directions of the fabric of the speaker damper showed an elongation of 150% or more in any direction.

This makes it possible to manufacture a deeper-drawing speaker damper, and can sufficiently cope with a large amplitude, thereby greatly contributing to the provision of a speaker with high input resistance.

In the above embodiment, polyester fiber is used for the core 7. However, in the present invention, a thermoplastic fiber other than polyester fiber is generally used as long as it is a chemical fiber having flexibility and heat resistance. It is also possible to use a thermosetting resin (aramid fiber or the like).

In the above embodiment, the original yarn has been described as a two-layer structure yarn. However, if the yarn has two or more layers covering the chemical fibers of the core 7, the yarn is not limited to the two-layer structure and may be a multi-layer structure yarn. If it is good.

Further, in the above embodiment, the surface of the yarn 9 is formed of the surface layer 8 of cotton fiber, but other natural fibers such as silk may be used as long as the resin can be impregnated for the prepreg. Things.

In the above embodiment, the base yarns are formed by weaving or knitting the single yarn 9 to form the base materials 10 and 11. However, the yarns 9 are twisted to form the original yarn. This may be woven or knitted to produce a substrate.

In the above embodiment, the substrates 10, 11
Although described as plain weave or plain knitting, other knitting methods having elasticity such as rubber knitting, pearl knitting, double-sided knitting and other known knitting methods may be used. This can be more suitable as a speaker damper.

[0038]

As described above, the present invention is based on a fabric consisting of a single layer of a multi-layer structure yarn having a central core made of a chemical fiber and a surface made of a natural fiber, or of two or more twisted yarns. By increasing the degree of expansion and contraction of the base material, the material has shaping properties, and has high shape retention even when heat is applied from the outside after molding with little internal stress remaining in the woven fabric. An object of the present invention is to provide a speaker damper exhibiting an excellent effect in durability against small heat.

[Brief description of the drawings]

FIG. 1 is an enlarged partial cross-sectional perspective view of a yarn which is a main part of an embodiment of the present invention.

FIG. 2 (a) is an enlarged view of a plain-woven base material as the main part, and (b) is an enlarged view of another plain-woven base material as the main part.

FIG. 3 is a sectional view of a conventional speaker.

[Description of Signs] 1 Damper for speaker 2 Magnetic circuit 3 Magnetic gap 4 Voice coil 5 Frame 6 Diaphragm 7 Core of polyester fiber 8 Surface layer of cotton fiber 9 Yarn 10 Plain weave base material 11 Plain knit base Lumber

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yukio Okamoto 1006 Kazuma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (3)

[Claims] Claims: 1. A resin material is applied to a base material of a multi-layered yarn composed of a synthetic fiber having a central portion made of a chemical fiber and a surface composed of a natural fiber, or a raw yarn obtained by twisting two or more yarns.
A speaker damper molded into a desired shape by heat molding. 2. The speaker damper according to claim 1, wherein the base material is formed of at least one of a flat knit, a rubber knit, a pearl knit, and a double-side knit. 3. A magnetic circuit, a voice coil fitted into a magnetic gap of the magnetic circuit, a diaphragm coupled to the voice coil and having an outer periphery coupled to a frame, and a diaphragm between the voice coil and the frame. A speaker comprising the speaker damper according to claim 1 or 2, which is coupled to support the voice coil.