JP2006217519A - Speaker diaphragm and method of manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a speaker diaphragm which is lightweight and has good sensitivity while keeping a good property of a textile fabric, and uses less amount of a filler when the filler is used. <P>SOLUTION: The speaker diaphragm is constructed by stacking first and second formed objects which are formed of the textile fabrics that are knitted with warps and wefts to predetermined shapes while keeping an angle between both knitting directions to a predetermined one. The method of manufacturing the speaker diaphragm comprises a forming process which forms the first formed object and the second formed object with the textile fabrics that are knitted with warps and wefts, and a stacking process which stacks the first formed object and the second formed object formed in the forming process while keeping an angle between both knitting directions to a predetermined one. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a speaker diaphragm and a manufacturing method thereof, and in particular, a speaker diaphragm and a speaker diaphragm manufactured by molding a woven fabric in which warp and weft are woven in a plain weave. It is about the method.

  The speaker diaphragm must be air permeable because it vibrates air and produces sound. Therefore, in a method of forming a speaker diaphragm by using a woven fabric in which warp and weft are woven in a plain weave, the woven fabric is heat-molded into a predetermined shape, and formed between adjacent warp and weft yarns. In order to close the weave, which is a fine hole to be formed, the fabric may be impregnated with a sealant. As the sealant, for example, a thermosetting resin is used, and a liquid thermosetting resin is impregnated into a woven fabric before heat molding, and the thermosetting resin is cured simultaneously with the molding of the woven fabric. Then, the molded product is given rigidity and the texture is closed (for example, see Patent Document 1).

  Conventionally, for the purpose of plugging the weave, after a woven fabric is heat-molded into a predetermined shape, a sheet made of other materials such as paper, PP (polypropylene), foaming material, etc. is formed on the back surface of the molded body. There is also a method of sticking and closing the texture.

JP 2001-169387 A

  However, in the method of impregnating the weave by impregnating the sealant into the woven fabric, the woven fabric woven in plain weave has a relatively large texture, so it is technical to impregnate the weave by impregnating the liquid sealant. It is difficult. Moreover, since this could be realized, a large amount of sealant was required to close the weave, so that there was a problem that the diaphragm became heavy and the sensitivity of the speaker was deteriorated.

  On the other hand, in the method of sticking the texture by pasting sheets of other materials, there is a problem that good characteristics of the woven fabric are lost and the sensitivity of the speaker is deteriorated.

  The present invention has been made in view of the above, and is a speaker diaphragm that can easily close the texture and can be lightweight, sensitive, and excellent in rigidity while retaining the good characteristics of the woven fabric. And it aims at obtaining the manufacturing method of a speaker diaphragm. Another object of the present invention is to obtain a speaker diaphragm and a method for manufacturing the speaker diaphragm that can reduce the amount of the filler when impregnating the filler.

  In order to solve the above-described problems and achieve the object, a speaker diaphragm according to a first aspect of the present invention includes first and second woven fabrics knitted with warps and wefts in a predetermined shape. The molded body is characterized in that it is configured to be overlapped so that the mutual weaving directions are inclined at a predetermined angle.

  According to a ninth aspect of the present invention, there is provided a speaker diaphragm manufacturing method comprising: a molding step of molding a first molded body and a second molded body from a woven fabric knitted with warps and wefts; And a superimposing step of superimposing the molded first molded body and the second molded body so that the weaving direction is inclined at a predetermined angle.

  Embodiments of a speaker diaphragm and a method for manufacturing the speaker diaphragm according to the present invention will be described below in detail. Note that the present invention is not limited to the embodiments. Below, the outline and features of the speaker diaphragm of the present invention will be described as embodiments, and then examples relating to the speaker diaphragm and the method for manufacturing the speaker diaphragm will be described.

[Embodiment 1]
In the speaker diaphragm according to the first embodiment, the first and second molded bodies in which a woven fabric knitted with warp and weft is formed in a cone shape is tilted so that the mutual knitting direction is inclined by approximately 45 degrees. In this way, they are made to overlap. With this configuration, the woven fabrics of the mutual molded bodies are inclined by approximately 45 degrees and overlap each other, so that the two molded bodies overlap each other so as to close the weave formed between the warp yarns and the weft yarns of the other molded bodies. For this reason, while being able to block | close a weave easily and leaving the good characteristic of a woven fabric, it can be set as the lightweight diaphragm with the sufficient sensitivity and the outstanding rigidity.

  Note that the angle at which the first and second molded bodies are overlapped does not have to be 45 degrees, and for example, a predetermined effect can be obtained even at about 10 degrees. However, the case of 45 degrees can most effectively close the eyes of the other molded bodies.

  Further, the shape of the molded body to be superimposed, that is, the shape of the diaphragm is not limited to the cone shape, and may be a dome shape. Further, the number of molded bodies to be superimposed is not limited to two, and may be three or four.

[Embodiment 2]
In the speaker diaphragm of the second embodiment, the first and second molded bodies in which a woven fabric knitted with warp and weft is formed in a cone shape is tilted so that the mutual knitting direction is inclined by approximately 45 degrees. In this way, the resin is impregnated between the warp and weft of both molded bodies and between the molded bodies. With this configuration, the texture can be completely and easily closed with a very small amount of resin (sealing agent).

  It should be noted that the resin impregnated between the warp and weft of the first and second molded products does not necessarily impregnate both molded products, and at least one of them is necessary for eliminating air permeability. So long as it is impregnated.

  In addition, the resin (adhesive) impregnated between the two molded bodies is not always necessary, and if the resin is impregnated between the two molded bodies, the adhesion between the two molded bodies is enhanced. In addition to improvement, it is possible to obtain an effect that it is easy to obtain a desired rigidity. In addition, the texture can be closed with a resin (adhesive) in which a resin is impregnated between the two molded bodies.

  FIG. 1 is a front view for explaining the structure of a speaker diaphragm according to an embodiment of the present invention. In FIG. 1, A <b> 1 shows a state where the speaker diaphragm 50 is viewed from the front, and shows a state of the surface of the first molded body 10. A2 shows an enlarged view of a part of A1. A3 shows an enlarged view of a part of A2. On the other hand, B1 shows a state where the speaker diaphragm 50 is viewed from behind, and shows a state of the surface of the second molded body 20. B2 shows an enlarged view of a part of B1. B3 shows an enlarged view of a part of B2. C1 shows a state in which the speaker diaphragm 50 is viewed from the front. C3 shows an enlarged view of a part of C1.

  Both the first molded body 10 and the first molded body 20 are produced by molding a plain woven fabric. The plain woven fabric is a woven fabric woven so that the warp yarn 8 and the weft yarn 9 are orthogonal to each other.

  The speaker diaphragm 50 is produced by bonding the first molded body 10 and the second molded body 20 together. And as well represented by A3, B3, and C3, when the first molded body 10 and the first molded body 20 are overlapped, the weave direction (knitting direction) is inclined 45 degrees with respect to each other. It is superimposed. With this configuration, the first molded body 10 and the first molded body 20 are tilted and overlapped by 45 degrees, and overlap each other so as to close the weave formed between the warp and the weft of the other molded body. For this reason, while being able to block | close a texture easily, it can be set as the speaker diaphragm 50 of the rigidity which is lightweight, has a good sensitivity, and was excellent, leaving the good characteristic of a woven fabric.

FIG. 2 is a schematic view for explaining a method of manufacturing the speaker diaphragm according to the present embodiment.
[First molding process]
First, a plain woven fabric 1 a is supplied from the raw material supply device 1. The woven fabric 1 a is prepared by being wound around the supply device 1 in a roll shape, and is sent out from the supply device 1 with the texture direction (knitting direction) oriented in a predetermined direction. Next, in order to prevent deformation at the time of molding, both sides of the fed woven fabric 1a with respect to the feeding direction are supported by the clamp 2 so as to be movable. Next, a thermosetting resin is supplied to the woven fabric 1a from a resin supply means (not shown), and then the woven fabric 1a supplied with the resin is hot pressed by the lower mold 3L and the upper mold 3U. The resin is rolled and impregnated throughout the woven fabric 1a, and the impregnated resin is semi-cured. Thereafter, die cutting and outer periphery cutting are performed, and the first molded body 10 is obtained.

[Second molding process]
On the other hand, the 2nd molded object 20 is produced in the process similar to the 1st molded object 10. The plain woven fabric 21a is prepared by being wound around the supply device 21 in a roll shape, and is sent out from the supply device 21 in a state where the weave direction (knitting direction) is inclined 45 degrees with respect to that of the woven fabric 1a. Next, in order to prevent deformation at the time of molding, both side portions of the fed woven fabric 21a with respect to the feeding direction are supported by the clamp 22 so as to be movable. Next, a thermosetting resin is supplied to the woven fabric 21a from a resin supply means (not shown), and then the woven fabric 21a supplied with the resin is hot pressed by the lower mold 23L and the upper mold 23U. The resin is rolled and impregnated throughout the woven fabric 21a, and the impregnated resin is semi-cured. Thereafter, die cutting and outer periphery cutting are performed, and the second molded body 20 is obtained.

[Overlay process]
Next, the first molded body 10 and the second molded body 20 are set between the upper mold 4U and the lower mold 4L. Here, the first molded body 10 and the second molded body 20 are overlapped so that the mutual weave direction (knitting direction) is inclined 45 degrees. And the 1st molded object 10 and the 2nd molded object 20 are integrated by hot press, and the intermediate molded object 30 is obtained.

[Edge part molding process]
The edge material 11 a is supplied from the edge material supply device 11. The edge material 11a is also prepared by being wound around the supply device 11 in a roll shape, and sent out from the supply device 11 according to the flow of the process. Next, the edge material 11 a is cut to an appropriate length by the cutting blade 12. Then, it shape | molds by heat-pressing with the lower side metal mold | die 13L and the upper side metal mold | die 13U, Furthermore, die cutting and inner and outer periphery cutting | disconnection are performed, and the edge part 40 is obtained.

[Edge integration process]
Next, the intermediate molded body 30 and the edge portion 40 are set between the upper mold 5U and the lower mold 5L, and the thermosetting resin is completely cured by hot pressing, and the intermediate molded body 30 and the edge portion 40 are also cured. And the speaker diaphragm 50 is obtained.

  Here, the first molded body molding step and the second molded body molding step constitute a molding process for molding the first molded body 10 and the second molded body 20. In the manufacturing method of the speaker diaphragm having such a configuration, a molding process for molding the first molded body 10 and the second molded body 20 from the woven fabrics 1a and 21a knitted with warp and weft, and a molding process The first molded body 10 and the second molded body 20 molded in step 1 are overlapped so that the braiding direction is inclined at a predetermined angle (45 degrees). The speaker diaphragm 50 in which the second molded bodies 10 and 20 are overlapped so that the mutual weaving directions are inclined at a predetermined angle can be easily manufactured.

  The speaker diaphragm 50 according to the present embodiment is impregnated with a thermosetting resin for the purpose of closing the texture and reinforcing the rigidity. The thermosetting resin may be deleted as long as the molded body 10 is superposed and the air permeability is lost and a predetermined rigidity is obtained.

  In addition, although the woven fabric 1a and the woven fabric 21a of this embodiment are knitted with the same fiber, they may be different from each other. That is, the fibers of the first molded body 10 and the second molded body 20 may be different. As an example, Kepler (trademark) fibers are used as the fibers of the first molded body 10, and carbon fibers are used as the fibers of the second molded body 20. With this configuration, both fibers can have good characteristics, and a strong and light speaker diaphragm can be obtained.

  The speaker diaphragm 50 according to the present embodiment is a cone-type diaphragm. However, the present invention is not limited to the cone type, and the same effect can be obtained even if the speaker diaphragm 50 is a dome type.

  The speaker diaphragm 50 of the present embodiment is a diaphragm in which the edge portion 40 molded in a separate process is integrally heat-molded by a heat press, but the edge portion is not molded in a separate process. For example, the diaphragm in which the cone part and the edge part are molded at once, and the diaphragm without the edge part are naturally excluded from the edge part molding and the process edge part integration step.

  Furthermore, if the first molded body 10 and the second molded body 20 have the same shape and a perfect circle, one of the two molded bodies prepared from the same mold is 45 degrees. After rotating, they may be overlapped. By adopting such a manufacturing method, the number of molds (molding dies) can be reduced, so that the cost can be reduced.

  Conversely, if the first molded body 10 and the second molded body 20 are molded with different molds (molding molds) as in this embodiment, an elliptical diaphragm or an eccentric diaphragm is used. Even it can be produced. In consideration of mass productivity and balance between processes, it is better that the first molded body 10 and the second molded body 20 are molded by different molds (molding molds).

  For example, acrylic paints and urethane paints can be used as the sealant used for the purpose of plugging the weave and the adhesive used for the purpose of bonding the two molded products that are overlapped.

  As described above, the speaker diaphragm and the manufacturing method thereof according to the present invention are useful for general speaker diaphragms, and are particularly suitable for lightweight and highly sensitive speaker diaphragms.

It is a front view for demonstrating the structure of the speaker diaphragm of the Example of this invention. It is a schematic diagram explaining the manufacturing method of the speaker diaphragm of the present Example of this invention.

Explanation of symbols

1a, 21a Woven cloth 3L Lower mold 3U Upper mold 4L Lower mold 4U Upper mold 5L Lower mold 5U Upper mold 8 Warp 9 Weft 10 First molded body 13L Lower mold 13U Upper mold 20 Second molded body 23L Lower mold 23U Upper mold 30 Intermediate molded body 40 Edge portion 50 Speaker diaphragm

Claims (15)

The first and second molded bodies in which a woven fabric knitted with warp and weft is formed in a predetermined shape are configured to overlap each other so that the mutual knitting directions are inclined at a predetermined angle. A speaker diaphragm. 2. The speaker diaphragm according to claim 1, wherein the first and second molded bodies are overlapped so that a mutual weaving direction is inclined by approximately 45 degrees. The filling agent is impregnated between warp and weft of at least one of the first molded body and the second molded body. Speaker diaphragm. The speaker diaphragm according to claim 3, wherein the sealant is a thermosetting resin. The speaker diaphragm according to any one of claims 1 to 4, wherein an adhesive is impregnated between the first molded body and the second molded body. The speaker diaphragm according to any one of claims 1 to 5, wherein the first molded body and the second molded body have the same shape manufactured by using the same mold. . The speaker diaphragm according to any one of claims 1 to 6, wherein the first molded body and the second molded body are manufactured using different molds. Of the first molded body and the second molded body, a molded body disposed on the front surface side is molded from a woven fabric knitted with Kepler (trademark) fiber, and a molded body disposed on the back surface side. The speaker diaphragm according to any one of claims 1 to 7, wherein the speaker diaphragm is molded from a woven fabric knitted with carbon fibers. A molding step of molding the first molded body and the second molded body from a woven fabric knitted with warp and weft;
And a superimposing step of superimposing the first molded body and the second molded body molded in the molding process so that their weaving directions are inclined at a predetermined angle. Manufacturing method of diaphragm. 10. The speaker vibration according to claim 9, wherein the first molded body and the second molded body to be molded in the molding step are of the same shape manufactured by a mold having the same shape. A manufacturing method of a board. 10. The speaker diaphragm according to claim 9, wherein the first molded body and the second molded body to be molded in the molding step are manufactured by molding molds having different shapes. Method. The speaker diaphragm according to any one of claims 9 to 11, wherein, in the superimposing step, the first and second molded bodies are superposed with each other being inclined by approximately 45 degrees. Manufacturing method. The method for manufacturing a speaker diaphragm according to any one of claims 9 to 12, wherein in the superimposing step, an adhesive is impregnated between the first and second molded bodies. In at least one of the molding step and the superposition step, a sealing agent is provided between the warp and the weft of at least one of the first molded body and the second molded body. The method for manufacturing a speaker diaphragm according to claim 9, wherein the speaker diaphragm is impregnated. In the molding step, the first and second molded bodies are molded by heat molding, and the first and second molded bodies are impregnated with a thermosetting resin before the heat molding. The method for manufacturing a speaker diaphragm according to any one of claims 9 to 14.

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