JP2003052100A - Composite material for center cap of speaker, its producing method and center cap of speaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a composite material for producing the center cap of a lightweight speaker having an excellent appearance. SOLUTION: A substrate cloth 1 and a coating resin layer 3 are laminated through an adhesive layer 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a center cap composite material used for a center cap of a speaker, a method for manufacturing the composite material, and a center cap manufactured by using the composite material.

[0002]

2. Description of the Related Art FIG. 8 shows an example of a speaker.
The speaker shown here includes a magnetic circuit unit 11, a vibration unit 12, and a frame 13. The magnetic circuit unit 11 includes a yoke 14 and an annular magnet 1.
5 and an annular top plate 16. The yoke 14 includes a bottom plate 17 and a center pole 18.
It has and. A magnetic gap 19 is formed between the top plate 16 and the center pole 18.

The vibration unit 12 includes a voice coil bobbin 20 and a voice coil 2 provided on the outer periphery of the bobbin 20.
1, a damper 22 that supports the bobbin 20 so that the bobbin 20 can vibrate, and a diaphragm 23 that is attached to the upper portion of the bobbin 20.
And an edge portion 24 attached to the outer peripheral edge of the diaphragm 23.
And a center cap 25 attached to the center of the diaphragm 23. The voice coil 21 is arranged in the magnetic gap portion 19 of the magnetic circuit unit 11. The outer peripheral edge of the edge portion 24 is attached to the frame 13.

The center cap 25 is for acoustically blocking the space in front of and behind the diaphragm 23 to improve the acoustic characteristics of this speaker, and is formed in a bowl shape having a substantially arcuate cross section, and at the peripheral edge thereof. It is attached to the diaphragm 23. The center cap 25 is made of a sheet-shaped composite material in which a base cloth is covered with a resin material such as polyurethane resin. The center cap 25 is formed by arranging the coating resin on the outer peripheral surface side so that the outer peripheral surface corresponding to the front surface side of the speaker is glossy and excellent in appearance.

The center cap 25 is usually manufactured as follows. As shown in FIG. 9, using a coater or the like, a resin material such as a thermoplastic polyurethane resin is applied to the surface of the base material cloth 26 to obtain a sheet-shaped composite material. This composite material has a resin layer 27 formed on the surface of the base material cloth 26. Then, the composite material is applied to the resin layer 27.
Is formed on the outer peripheral surface side by press molding using a mold under high temperature conditions (for example, about 200 ° C.) to obtain a bowl-shaped center cap 25.

[0006]

[Problems to be Solved by the Invention] Center cap 25
Is a vibration unit 12 that generates a sound wave by vibration, the weight of the center cap 25 is
It has a great influence on the acoustic characteristics of the speaker. In particular, the acoustic characteristics of the high range speaker are easily affected by the weight of the center cap. Therefore, for the purpose of reducing the weight of the center cap, the use of a base fabric having coarse mesh (low yarn weaving density) has been studied. However, in the above-mentioned conventional center cap composite material, when a coarse-grained base cloth is used, the coating resin is softened and easily penetrates into the base cloth during press molding, so that the base cloth surface is slightly exposed. In some cases, the surface of the composite material may have an uneven shape. In this case, the gloss of the outer peripheral surface of the center cap is lost, and there is a problem that its aesthetic appearance is impaired. The present invention has been made in view of the above circumstances, and is a composite material for a center cap that is lightweight and that can obtain a center cap excellent in aesthetics, a method for manufacturing the same, and a center cap manufactured using the same. It is intended to be provided.

[0007]

The center cap composite material of the present invention is characterized in that a base cloth made of a cloth material and a coating resin layer are laminated via an adhesive layer. The coating resin layer is preferably made of at least one of polyurethane resin, acrylic resin, rubber, and silicone resin. The adhesive layer is preferably made of at least one of polyurethane resin, acrylic resin, rubber and silicone resin. The method for producing a composite material for a center cap of the present invention is a base cloth made of a cloth material,
An adhesive layer forming step of applying an adhesive material to form an adhesive layer,
A coating resin layer forming step of forming a coating resin layer by molding the coating resin material into a sheet and curing the coating resin layer, and an adhesive layer formed in the adhesive layer forming step. And a base resin cloth and a coating resin layer are laminated via an adhesive layer to obtain a composite material for a center cap. The center cap of the speaker of the present invention is characterized by being made of a composite material for a center cap in which a base material cloth made of a cloth material and a coating resin layer are laminated via an adhesive layer.

[0008]

FIG. 1 is a partial cross-sectional view showing an embodiment of a composite material for a center cap of a speaker of the present invention. The center cap composite material 10 shown here is configured by laminating a base cloth 1 made of a cloth material and a coating resin layer 3 with an adhesive layer 2 interposed therebetween. As the base cloth 1, it is preferable to use a woven cloth composed of the single yarns 4. The base cloth 1 is preferably a woven cloth in which warp single yarns 4a and weft single yarns 4b are combined to form a woven fabric structure such as plain weave, twill weave, and satin weave.

As the material of the single yarn 4, natural fiber or synthetic fiber may be used. Suitable materials for the single yarn 4 include polyester, nylon, aramid, silk,
Mention may be made of cotton and T / C mixed spinning. Above all,
Preference is given to using polyester. If the single yarn 4 is too thin, the strength of the base fabric 1 is reduced, and if it is too thick, the base fabric 1
Since the flexibility is low and the handleability is low, the thickness (outer diameter) is preferably 5 to 75 denier.
The weaving density of the single yarn 4 (the number of the single yarn 4 per unit width or unit length) is preferably 50 to 200 yarns / inch. When this density is less than this range, the strength of the base fabric 1 is reduced. On the other hand, if the density exceeds the above range, the weight of the base fabric 1 becomes large and it becomes difficult to reduce the weight of the composite material 10.

As the single yarn 4, a yarn exhibiting a desired color can be used. For example, if a black product is used, the molded product (center cap) can be given a heavy feeling. Further, by adopting those exhibiting red, blue, yellow, green, orange, etc., it is possible to impart unique design characteristics to the molded product.

In order to make the mechanical properties (tensile strength, elongation, etc.) of the base cloth 1 uniform, the weaving density of the warp single yarn 4a is set to be substantially equal to that of the weft single yarn 4b. Is preferred. If the base cloth 1 is too thin, the strength will decrease, and if it is too thick, the flexibility will decrease, so the thickness (thickness A shown in FIG. 1) is preferably 50 to 200 μm.

The base cloth 1 is not limited to a woven cloth, but a non-woven cloth may be used. When using non-woven fabric,
It is preferable to use one having a basis weight of 5 to 30 g / m ³ .

The adhesive layer 2 is for bonding the base cloth 1 and the coating resin layer 3, and it is preferable to use a synthetic resin as the material. As this material, it is preferable to use at least one of polyurethane resin, acrylic resin, rubber, and silicone resin. Polyacrylic acid ester can be used as the acrylic resin. As the rubber, natural rubber or synthetic rubber can be used. Synthetic rubbers include diene rubbers (butadiene rubber, styrene-butadiene rubber, chloroprene rubber, butadiene-acrylonitrile rubber, etc.), non-diene rubbers (isoprene rubber, isobutylene-isoprene rubber,
Ethylene-propylene rubber, etc.), thermoplastic elastomer, etc. can be used. As a silicone resin,
Phenyl silicone and dimethyl silicone can be used. Among these, thermoplastic polyurethane resin is particularly preferable. If the adhesive layer 2 is too thin, the adhesive force between the base fabric 1 and the coating resin layer 3 will be reduced, and if it is too thick, the cost of this resin material will be high. The distance (thickness B shown in FIG. 1) between the upper surface of the base cloth 1 and the lower surface of the coating resin layer 3 is preferably 5 to 10 μm.

The coating resin layer 3 has at least one of polyurethane resin, acrylic resin, rubber and silicone resin.
It is preferred to use seeds. Polyacrylic acid ester can be used as the acrylic resin. As the rubber, natural rubber or synthetic rubber can be used. Synthetic rubbers include diene rubbers (butadiene rubber, styrene-butadiene rubber, chloroprene rubber, butadiene-acrylonitrile rubber, etc.), non-diene rubbers (isoprene rubber, isobutylene-isoprene rubber, ethylene-propylene rubber, etc.), thermoplastic elastomers. Etc. can be used. Phenyl silicone or dimethyl silicone can be used as the silicone resin.

As a material of the coating resin layer 3, a material exhibiting a desired color can be used. For example, if a material exhibiting a black color is used, the molded product (center cap) can be given a heavy feeling. Further, by adopting those exhibiting red, blue, yellow, green, orange, etc., it is possible to impart unique design characteristics to the molded product. Further, if a transparent material is used, it is possible to give a molded article a transparent feeling.

Thickness of coating resin layer 3 (thickness C shown in FIG. 1)
Is preferably 10 to 30 μm. If this thickness is less than this range, the surface of the coating resin layer 3 has irregularities along the base material cloth 1, and the gloss thereof may be reduced. On the other hand, if the thickness exceeds the above range, the resin cost will increase, which is not preferable.

Next, one embodiment of the method for manufacturing the center cap composite material of the present invention will be described by taking as an example the case where the center cap composite material 10 shown in FIG. 1 is manufactured using the manufacturing apparatus shown in FIG. explain. The manufacturing method shown below has the following three steps. (1) Adhesive layer forming step of applying an adhesive material to the base cloth 1 to form the adhesive layer 2. (2) A coating resin layer forming step of molding the coating resin material into a sheet and curing the sheet to form the coating resin layer 3. (3) A laminating step in which the coating resin layer 3 obtained in this step is laminated on the adhesive layer 2 formed in the adhesive layer forming step. Hereinafter, each step will be described in detail.

(1) Adhesive Layer Forming Process As shown in FIG. 2, a sheet-shaped mold material 31 made of resin such as PET or paper is fed out by using a feed roller 32. Next, an adhesive material (a coater or the like) 33 is used to apply an adhesive material (a thermoplastic polyurethane resin or the like) to be the adhesive layer 2 onto the mold material 31 so as to have a predetermined thickness. Next, the base material cloth 1 is supplied using the base material cloth supply roller 34, the base material cloth 1 is superposed on the adhesive material, and these are sent to the dryer 35 to dry and cure the adhesive material,
The adhesive layer 2 has a sufficient hardness. As a result, the first intermediate product M1 in which the adhesive layer 2 and the base fabric 1 are laminated on the mold material 31 is obtained (see FIG. 3). This first intermediate product M
1 is taken up by the take-up roller 36.

(2) Coating Resin Layer Forming Process As shown in FIG. 4, another mold material 31 is fed out by using a feeding roller 32, and a coating resin material supply section (coater or the like) 37 is used on this mold material 31. Then, a coating resin material (polyurethane resin or the like) to be the coating resin layer 3 is applied to a predetermined thickness. Next, these are sent to the drier 35, and the coating resin material is dried and cured to form the coating resin layer 3 having sufficient hardness. When the coating resin material is dried and cured, it is preferable that the temperature condition is 100 to 130 ° C. and the treatment time is 1 to 5 minutes. As a result, the mold material 31
A second intermediate product M2 having the coating resin layer 3 formed thereon is obtained (see FIG. 5).

(3) Laminating Step As shown in FIG. 4, the first intermediate product M1 (FIG. 3) is
It is sent from the sending roller 38. At this time, the take-up roller 39
The mold material 31 is peeled off from the adhesive layer 2 by using
A third intermediate product M3 composed of the adhesive layer 2 and the adhesive layer 2 is obtained (see FIG. 6). The third intermediate product M3 is fed to the pressure bonding roller 40, and the second intermediate product M2 is used by using the pressure bonding roller 40.
(Fig. 5) and they are pressure bonded. At this time, the adhesive layer 2 is pressed onto the coating resin layer 3. Thus, the composite material 10 having the base cloth 1, the adhesive layer 2, and the coating resin layer 3 is formed on the mold material 31 as the fourth intermediate product M.
4 (see FIG. 7) is obtained. The fourth intermediate product M4 is taken up by the take-up roller 41. Finally, the mold material 31 is peeled off from the fourth intermediate product M4, and the composite material 1 shown in FIG.
Get 0.

The composite material 10 can be used as a center cap for a speaker by pressing it under a high temperature (for example, 200 ° C.) condition using a pressing machine (not shown) and molding it into a bowl shape. At this time, the composite material 10 is
The coating resin layer 3 is formed so as to face the outer peripheral surface side. This center cap can be used as the center cap 25 shown in FIG.

The surface (outer peripheral surface) of the center cap can be colored with a pigment, a paint or the like. For example, a silver-colored center cap can be obtained by adhering a pigment and paint containing silver to the surface of the center cap. It is also possible to color the center cap with a pigment or paint such as red, blue, yellow, green or orange.

In the composite material 10 of this embodiment, the coating resin layer 3 is laminated on the base material cloth 1 via the adhesive layer 2, so that the base material cloth 1 has a surface (see FIG. 1 middle upper surface)
The exposed surface can be prevented and the surface can be flattened. For this reason, the mesh is coarse (weaving density of yarn is low)
Even when the base cloth 1 having a small weight is used, it is possible to give the molded article sufficient gloss. Therefore, it is possible to obtain a molded product (center cap) that is lightweight and has an excellent appearance. Further, since the base cloth 1 having a coarse mesh can be used, the light transmittance of the composite material 10 can be improved,
It is possible to give a molded article a sense of transparency.

In general, the acoustic characteristics of the speaker, especially the acoustic characteristics of the high-frequency range speaker, are easily affected by the weight of the center cap. Since the center cap manufactured using this composite material 10 can be made lightweight, excellent acoustic characteristics can be obtained especially in a speaker for the high frequency range.

Further, according to the above-mentioned manufacturing method, the adhesive layer 2 is formed on the substrate cloth 1, and the coating resin layer 3 formed in another step.
Is cured and then laminated on the adhesive layer 2, it is possible to prevent the coating resin layer 3 from penetrating into the base fabric 1 during this lamination. For this reason, the composite material 1 in which the coating resin layer 3 having a sufficient thickness is laminated on the base fabric 1 via the adhesive layer 2
You can get 0. Therefore, it is possible to prevent the base material cloth 1 from being exposed on the surface during press molding, to make the surface flat, and to give sufficient gloss to the molded product. Therefore, it is possible to obtain a molded product (center cap) that is lightweight and has an excellent appearance. Further, it is possible to give the molded product a transparent feeling.

In the above-mentioned manufacturing method, in the adhesive layer forming step, after the adhesive is dried and cured, it is subjected to the next step (coating resin layer forming step). However, the present invention is not limited to this. Alternatively, the adhesive may be subjected to the next step in an uncured state.

[0027]

Example (Example 1) A composite material 10 shown below was produced. (1) Base cloth 1 Single yarn material: Tetron single yarn outer diameter: 30 denier Fabric structure: Plain weave density: 99 yarns / inch Base fabric thickness: 100 μm (2) Adhesive layer 2 Material: Polyurethane resin adhesive layer thickness Size: 10 μm (3) Coating resin layer 3 Material: Polyurethane resin coating resin layer Thickness: 15 μm

This composite material 10 was produced by the following method.
As shown in FIG. 2, an adhesive made of polyurethane resin is applied on the mold material 31, the above-mentioned substrate cloth 1 is superposed thereon, and the adhesive is dried and cured by a dryer 35 (drying treatment temperature: 110 C, treatment time: 4 minutes), first intermediate product M1
(Fig. 3) was obtained. Next, as shown in FIG. 4, another mold material 31 is coated with a coating resin material made of polyurethane resin, which is dried and cured by a dryer 35 to obtain a second intermediate product M2 (FIG. 5). . Then, the third intermediate product M3 obtained by peeling the mold material 31 from the first intermediate product M1 (FIG. 6)
Is crimped to the second intermediate product M2, and the fourth intermediate product M4
(FIG. 7) was obtained. The mold material 31 was peeled off from the fourth intermediate product M4 to obtain the composite material 10.

(Example 2) As a material of the coating resin layer 3,
A composite material 10 was produced in the same manner as in Example 1 except that an acrylic resin (polyacrylic acid ester) was used instead of the polyurethane resin.

(Example 3) As a material of the coating resin layer 3,
A composite material 10 was produced in the same manner as in Example 1 except that rubber (isoprene rubber) was used instead of the polyurethane resin.

(Example 4) As a material of the coating resin layer 3,
A composite material 10 was produced in the same manner as in Example 1 except that a silicone resin (phenyl silicone) was used instead of the polyurethane resin.

(Comparative Example 1) A sheet-like material having a resin layer 27 formed on the surface of a base cloth 26 by applying a thermoplastic polyurethane resin to the surface of the same base cloth as that used in Example 1 A composite material (Fig. 9) was obtained.

A bowl-shaped center cap was produced by press-molding (200 ° C., 5 seconds) the composite materials of Examples 1 to 4 and Comparative Example 1. 100 center caps were produced for each of Examples 1 to 4 and Comparative Example 1, and the presence or absence of gloss on the outer peripheral surface was confirmed. As a result, the center cap obtained from the composite material of Comparative Example 1 was 100
Whereas 10 of the pieces lacked luster,
It was confirmed that the center caps obtained from the composite materials 10 of Examples 1 to 4 all had sufficient gloss.

[0034]

As described above, in the center cap composite material of the present invention, the coating resin layer is laminated on the base cloth via the adhesive layer. The cloth can be prevented from being exposed to the surface and the surface can be made flat. Therefore, even when a base cloth having coarse meshes (low yarn weaving density) is used, it is possible to impart sufficient gloss to the molded product. Therefore, it is possible to obtain a molded product (center cap) that is lightweight and has an excellent appearance. Further, it is possible to give the molded product a transparent feeling. Since the center cap manufactured using this composite material can be reduced in weight, excellent acoustic characteristics can be obtained especially in a speaker for the high frequency range.

Further, according to the method for producing a composite material for a center cap of the present invention, an adhesive layer is formed on a base cloth, and the coating resin layer formed in another step is cured and then laminated on the adhesive layer. Therefore, it is possible to prevent the coating resin layer from penetrating into the base fabric during the lamination. Therefore, it is possible to obtain a composite material in which the coating resin layer having a sufficient thickness is laminated on the base fabric via the adhesive layer. Therefore, it is possible to prevent the base cloth from being exposed on the surface during press molding, and to make the surface flat,
It is possible to give a molded article a sufficient gloss. Therefore, it is possible to obtain a molded product (center cap) that is lightweight and has an excellent appearance. Further, it is possible to give the molded product a transparent feeling.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view showing an embodiment of a center cap composite material of the present invention.

FIG. 2 is a schematic configuration diagram showing a manufacturing apparatus that can be used to manufacture the composite material shown in FIG.

FIG. 3 is a partial cross-sectional view showing an intermediate product obtained in the process of manufacturing the composite material shown in FIG.

FIG. 4 is a schematic configuration diagram showing a manufacturing apparatus that can be used to manufacture the composite material shown in FIG.

5 is a partial cross-sectional view showing an intermediate product obtained in the process of manufacturing the composite material shown in FIG.

6 is a partial cross-sectional view showing an intermediate product obtained in the process of manufacturing the composite material shown in FIG.

7 is a partial cross-sectional view showing an intermediate product obtained in the process of manufacturing the composite material shown in FIG.

8A and 8B are schematic configuration diagrams showing a speaker in which a center cap manufactured by using the composite material shown in FIG. 1 can be used. FIG. 8A is an overall view and FIG.

FIG. 9 is a partial cross-sectional view showing an example of a conventional center cap composite material.

[Explanation of symbols]

1 ... Substrate cloth, 2 ... Adhesive layer, 3 ... Coating resin layer, 10 ...
Composite material, 25 ... Center cap

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Hideo Takahashi             Showa-ko, Sumiyoshi 2-chome No.6, Soka City, Saitama Prefecture             Business (72) Inventor Makoto Makoto             Showa-ko, Sumiyoshi 2-chome No.6, Soka City, Saitama Prefecture             Business F term (reference) 5D012 BA09 EA01 EA06 HA03

Claims (5)

[Claims] 1. A composite material for a center cap of a speaker, characterized in that a base cloth made of a cloth material and a coating resin layer are laminated via an adhesive layer. 2. The coating resin layer is at least one of polyurethane resin, acrylic resin, rubber and silicone resin.
The composite material for a center cap of a speaker according to claim 1, wherein the composite material comprises a seed. 3. The composite material for a center cap of a speaker according to claim 1, wherein the adhesive layer is made of at least one of polyurethane resin, acrylic resin, rubber and silicone resin. 4. An adhesive layer forming step of applying an adhesive material to a base cloth made of a cloth material to form an adhesive layer, and forming a coating resin material into a sheet shape and curing the same to form a coating resin layer. The coating resin layer forming step to be formed, and the coating resin layer obtained in this step is laminated on the adhesive layer formed in the adhesive layer forming step, and the base cloth and the coating resin layer are bonded via the adhesive layer. A method of manufacturing a composite material for a center cap of a speaker, comprising: a step of obtaining a laminated composite material for a center cap. 5. A center cap of a speaker, comprising a base cloth made of a cloth material and a composite material for a center cap in which a coating resin layer is laminated via an adhesive layer.