JP2002010390A - Speaker edge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a speaker edge capable of preventing from changes in mechanical strength of a foamed urethane edge that is used for various audio apparatuses. SOLUTION: A speaker edge 20 is formed by heating and molding a compound basic material of a foamed basic material such as a foamed urethane and a reinforcing material 10 having a higher extendibility than that of a material which is created after forming of the above foamed basic material and also having a high extension strength at the extension limit. Using a high extendibility of the material 10, the edge 20 is possible to suppress occurrences of a dimple or wrinkles that are abnomal deformations in a deformation status of the edge 20 at a large amplitude by a high extendibility and a high inner loss of the foamed urethane, and possible to prevent a ripped edge from a repetition of extension of the edge 20 at the large amplitude.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a support member constituting a speaker used for various kinds of audio equipment and a speaker edge as a sound insulation member.

[0002]

2. Description of the Related Art With the recent trend of miniaturization and high performance of speaker systems, there has been a demand for a speaker system capable of reproducing bass sound with the spread of high quality sources. In order to enable the reproduction of heavy bass with a small diameter, it is necessary to increase the flexibility of the support system, vibrate the diaphragm of the speaker greatly, and increase the volume velocity, from small input to large input. There is a demand for a vibration-system supporting component that gives an amplitude with good linearity to a driving force generated in a voice coil, such as an edge or a damper.

Here, a conventional speaker edge will be described with reference to FIGS. 7 and 8. FIG.

FIG. 7 is a cross-sectional view of a roll portion of a conventional urethane foam edge which is a conventional speaker edge joined to an outer peripheral portion of a diaphragm, and FIG. 8 is a raw urethane foam.

In FIGS. 7 and 8, reference numeral 1 denotes an edge for a speaker, reference numeral 2 denotes a roll portion of a urethane foam edge, and reference numeral 3 denotes a flat portion continuously formed on the outer peripheral portion of the roll portion 2.
It is joined to a speaker frame (not shown). Reference numeral 4 denotes a joining portion continuously formed on the inner peripheral portion of the roll portion 2 to which the outer peripheral portion of the diaphragm 5 is joined. Generally, urethane foam is relatively breathable, and a raw fabric 6 having a thickness of 5 to 8 mm is compressed to about 10 to 20 times, and is heated and molded to form an edge shape.

The operation of the above-described speaker edge will be described.

When an input is applied to the speaker and the diaphragm vibrates back and forth, each point on the surface of the roll portion 2 of the speaker edge 1 moves in the radial direction. That is, when the diaphragm 5 is displaced forward by the roll-shaped loudspeaker edge 1 as shown in FIG. 7, each point on the surface of the roll portion 2 moves to the outer diameter side. When the diaphragm 5 is displaced backward, each point on the surface of the roll 2 moves to the inner diameter side. Therefore, each point on the surface of the roll portion 2 at rest has a circumferential length at that position, but when displaced to the outer diameter side, the circumferential length becomes longer and the shortage is made of the material. Supplement with elongation,
When displaced to the inner diameter side, the circumference length is shortened and the surplus is absorbed by the shrinkage of the material. Therefore, the urethane foam edge generates less abnormal sound due to abnormal deformation with respect to vibration amplitude,
It is a good edge material.

[0008]

However, the above-mentioned conventional speaker edge has the following problems. Although it is a foamed urethane edge having excellent elasticity, since the breaking strength at the limit of elongation is small, the phenomenon of stretching of the speaker edge 1 occurs at a large vibration amplitude, breaking the urethane foam chain, and finally The speaker edge 1 breaks. 2. Certain urethane foam edges undergo chemical changes when exposed to light, especially ultraviolet light, for long periods of time, breaking the chains at the molecular level and breaking with mechanical stress. 3. Certain types of urethane foam edges undergo a chemical change called hydrolysis when exposed to a high-temperature, high-humidity atmosphere for a long period of time, breaking the chains at the molecular level, resulting in breakage with mechanical stress. There was a problem that.

An object of the present invention is to provide a speaker edge which solves the above-mentioned problems without impairing the high elasticity of urethane foam.

[0010]

According to a first aspect of the present invention, there is provided a loudspeaker edge using a foam base material made of at least urethane foam and molding the foam base material. The composite base material is composed of a reinforcing material that has higher elasticity than the later material and has high tensile strength at the tensile limit, and is formed by hot molding and pressing. High elasticity of the material,
Due to the high internal loss and the high elasticity and flexibility of the fiber constituting the reinforcing material, it is possible to suppress the occurrence of abnormal deformation such as ecbos and wrinkles in the deformation state of the edge at the time of large amplitude. An object of the present invention is to provide a speaker edge capable of preventing edge breakage even from repetition of edge striking during amplitude.

[0011] The loudspeaker edge according to the second aspect of the present invention is a reinforcing material made of a natural fiber, a synthetic fiber, or a highly stretchable woven or knitted fabric formed of a composite fiber thereof, such as urethane. It is formed by impregnating or applying a foaming resin liquid, and applying heat molding and pressing a foam-like base material in which the foaming resin liquid is foamed. While preventing wrinkles from occurring, the urethane foam has a high tensile strength at the limit of elongation of a highly elastic woven or knitted reinforcing material formed of fibers arranged inside the cross section in a tension state acting on the edge. It is possible to provide a speaker edge capable of reinforcing the tensile strength of the edge and preventing breakage of the urethane foam edge at the edge amplitude limit. It is intended.

According to a third aspect of the present invention, there is provided an edge for a speaker, wherein a reinforcing material having a mesh structure made of a metal net or a heat-resistant resin material is used as the reinforcing material according to the second aspect, and the flexible structure having a mesh structure is used. In addition to preventing the occurrence of wrinkles and wrinkles due to the urethane's elasticity, the mesh structure reinforcing material placed inside the cross section improves the tensile strength against deformation, and foaming at the edge amplitude limit An object of the present invention is to provide a speaker edge capable of preventing a breakage of a urethane edge.

The loudspeaker edge according to a fourth aspect of the present invention comprises a plurality of reinforcements arranged in a tangential direction or a radial direction as the reinforcement according to the second aspect, and a relatively small number of reinforcements is provided. Since the materials are arranged axially symmetrically, the elasticity of the urethane foam can be used effectively, preventing abnormal deformation due to large amplitude, and there is a limit to the reinforcing material arranged axially symmetric with respect to tension at large amplitude. An object of the present invention is to provide a speaker edge in which a urethane portion is not broken so as to exert a resistance to amplitude.

According to a fifth aspect of the present invention, there is provided a loudspeaker edge formed by subjecting the foamed base material according to the second, third or fourth aspect of the present invention to heat and press molding. By removing the high-density film part on the front and back by a known means such as a hot wire or a cutter, the mass of the edge acting as the vibration system mass can be reduced, and the output sound pressure level of the speaker can be improved.

According to a sixth aspect of the present invention, there is provided the speaker edge according to the first aspect of the present invention, wherein at least the front surface, the rear surface, or a plurality of foamed urethane foam base materials obtained by cutting a reinforcing material made of a highly stretchable film into a predetermined thickness. It is formed by heating and pressing a laminated base material inserted into the intermediate layer of urethane foam base material. By placing a highly elastic film in the cross section of the edge, deformation of the urethane foam during large amplitude In the state, while using the elasticity of the urethane foam to prevent the occurrence of wrinkles and wrinkles, and at the limit of the elongation of the reinforcing material consisting of a highly elastic film arranged inside the cross section in the tension state acting on the edge High tensile strength reinforces the tensile strength of the urethane foam edge and prevents breakage of the urethane foam edge at the edge amplitude limit With wear, it is those that can provide a speaker edge which prevents breathable, the hydrolysis of the absorbed suppress foaming urethane moisture.

According to a seventh aspect of the present invention, there is provided a speaker edge using a black urethane film as the highly stretchable film according to the sixth aspect. An object of the present invention is to provide an edge for a speaker capable of preventing the breakage of a chain of urethane foam molecules which may be generated when irradiated.

The loudspeaker edge according to claim 8 of the present invention is formed by reinforcing a reinforcing member made of a natural fiber, a synthetic fiber or a composite fiber thereof with a high elasticity and having a coarse weave or knit to a predetermined thickness. The laminated base material inserted into at least the front surface, the back surface of the cut urethane foam base material or the intermediate layer of a plurality of urethane foam base materials is formed by heating and pressing. The material and the foam base material can be formed separately, and in particular, since the foam base material is obtained by cutting a bread-like urethane foam to a predetermined thickness, the cost required for the urethane foaming step can be reduced, An inexpensive speaker edge can be provided.

The loudspeaker edge according to the ninth aspect of the present invention uses a metal net having a mesh structure or a heat-resistant resin material as the reinforcing member according to the eighth aspect. In the state, the reinforcing material of the mesh structure arranged inside the cross section has a flexible structure, and prevents the occurrence of ecbos and wrinkles by using the elasticity of urethane, and the mesh structure of the mesh structure arranged inside the cross section The reinforcing material enhances the tensile strength against deformation, and can prevent the urethane foam edge from breaking at the edge amplitude limit.

According to a tenth aspect of the present invention, there is provided a speaker edge according to the first to sixth or eighth aspects, wherein the material of the urethane foam is a foamed urethane colored black with an ether. An object of the present invention is to provide a loudspeaker edge excellent in weather resistance, which can prevent breakage of a chain of urethane foam molecules which can be generated when the urethane foam is irradiated with light and irradiated with ultraviolet rays for a long time.

According to a twelfth aspect of the present invention, there is provided the speaker edge according to the first to fourth or eighth aspect, wherein the material of the urethane fiber forming the reinforcing material is colored black with an ether urethane fiber. When the urethane fiber is irradiated with light and ultraviolet rays are irradiated for a long time, breakage of a chain of urethane molecules that can be prevented can be prevented, and finally a speaker edge excellent in weather resistance can be provided. Things.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a speaker edge according to the present invention will be described below with reference to FIGS.

(Embodiment 1) Embodiment 1 mainly describes claims 2, 3, 4, and 5, and FIG. 1 shows an embodiment of the present invention. FIG. 2A is a cross-sectional view of an essential part of a speaker edge, and FIG. 2A is a cross-sectional view of the composite base material of the speaker edge in an initial state.
(B), (c) is sectional drawing which shows the state of the composite base material before the edge for speakers is hot-molded and pressed.

According to FIG. 2 (a), reference numeral 10 denotes a coarse mesh structure reinforcing material made of urethane fiber or the like;
Is a urethane foam resin liquid impregnated into the reinforcing material 10 having a mesh structure and adhered to the surface thereof by passing the reinforcing material 10 through a urethane foam resin liquid tank.

As shown in FIG. 2B, the foamed urethane resin liquid 11 foams to form a foamed urethane 12 around a reinforcing member 10 having a mesh structure, thereby forming a foamed composite base material (a) 13. ing. Reference numeral 14 denotes a film portion formed on the surface of the urethane foam.

FIG. 2 (c) shows a foam composite substrate (b) obtained by slicing the foam composite substrate (a) 13 to a uniform thickness in order to remove the dense film part 14 from the foam composite substrate (a) 13. 15 are formed.

Referring to FIG. 1, reference numeral 20 denotes a main part of a speaker edge, and reference numeral 21 denotes a roll part of a foamed urethane edge.
Reference numeral 2 denotes a flat portion continuously formed on the outer peripheral portion of the roll portion 21 and is joined to a speaker frame (not shown). Reference numeral 23 denotes a joining portion continuously formed on the inner peripheral portion of the roll portion 21 to which the outer peripheral portion of the diaphragm 24 is joined. The loudspeaker edge 20 is obtained by forming the foam-shaped composite base material (a) 13 or, in the case of reducing the weight of the edge portion, the foam-shaped composite base material (b) 15 by a hot press. is there.

The reason for the speaker edge 20 having the above-mentioned configuration that the urethane foam edge is a good speaker edge 20 with less occurrence of abnormal sound due to abnormal deformation with respect to the vibration amplitude is described in the related art. The description is omitted because it is the same as. The speaker edge 20 of the first embodiment is formed by using a reinforcing material 10 having a mesh structure, which is a more flexible structure of urethane fibers having high elasticity and high tensile strength inserted in the cross section of urethane foam. Therefore, it works without impairing the high elasticity of the urethane foam. Then, for a large vibration amplitude, that is, in the tension phenomenon at the limit displacement, the tensile strength of the small urethane foam edge is increased by supplementing the reinforcing material 10 made of a material having high elasticity and high tension such as urethane fiber. , Urethane foam frame or diaphragm 2
4 can be prevented from breaking at the joint.

As described above, the following effects can be obtained: 1) It is possible to provide an excellent speaker edge 20 with less occurrence of abnormal sound due to abnormal deformation with respect to vibration amplitude. 2) In the tension phenomenon at the limit displacement, the reinforcing member 10 made of a material having high elasticity and high tension such as urethane fiber supplements the tensile strength of the small urethane foam edge, so that the urethane foam edge 20 can be formed into a frame or the like. It is possible to provide the speaker edge 20 that can be prevented from being broken at the joint with the diaphragm 24. 3) Further, by removing the film portion 14, it is possible to provide a loudspeaker edge that is lightweight and can improve the sound pressure level of the loudspeaker.

A plurality of reinforcing members 10 may be arranged in a tangential direction or a radial direction to form a foam-shaped composite base material (a) 13 and the speaker edge 20 may be formed by a hot molding press. It is possible to provide the speaker edge 20 having the above-mentioned effect.

(Embodiment 2) Embodiment 2 of the present invention will be described with reference to FIGS. The same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

FIG. 3 is a cross-sectional view of a main part of a speaker edge according to a second embodiment of the present invention. FIG. 4 is a cross-sectional view showing a state of a composite base material before the speaker edge is hot-molded and pressed. It is. The speaker edge of the present invention will be described with reference to FIGS.

In FIG. 4, reference numeral 10 denotes a reinforcing material having a mesh structure made of urethane fibers, which may be dipped in a urethane-based adhesive. Reference numerals 31a and 31b denote urethane foam base materials cut to a predetermined thickness, and the reinforcing material 10 is inserted into an intermediate layer to form a laminated base material 32. In the second embodiment of the present invention, the reinforcing member 10 is inserted into the intermediate layer of the foam base materials 31a and 31b. However, a plurality of intermediate layers are provided and arranged on one side of the front surface or the back surface. Needless to say, the functions and effects of the reinforcing member 10 are the same, and are included in the technical category.

The loudspeaker edge 30 shown in FIG. 3 is formed by hot-pressing the laminated base material 32. The configuration is the same as that shown in FIG.

Although the structure shown in the second embodiment is finally equivalent to that of the first embodiment, there is a difference in the manufacturing process. That is, in the first embodiment, the reinforcing material 10 is impregnated with the urethane foam resin liquid 11, and the foamed urethane edge is entangled with the reinforcing material 10 through a foaming process to form the foam-shaped composite base material (a) 13. The foamed composite base material (b) 15 is formed by slicing to a uniform thickness in order to remove a film-like portion having a large surface density in order to reduce the weight of the substrate. In this case, the reinforcing member 10 and the foam bases 31a and 31b can be separately formed. In particular, the foam bases 31a and 31b are obtained by cutting a pan-shaped urethane foam into a predetermined thickness to form a laminated base. Lumber 3
2 is obtained.

As described above, according to the first embodiment,
1) Prevention of generation of abnormal sound due to abnormal deformation with respect to vibration amplitude, 2) Prevention of edge breakage in tension phenomenon at marginal displacement, 3) Sound of speaker by removing film quality part In addition to increasing the pressure level,
4) The cost required for the urethane foaming step can be reduced, and an inexpensive speaker edge 30 can be provided.

In the first and second embodiments,
Although the reinforcing material 10 is configured to have a mesh structure made of urethane fiber or the like, it is configured to be formed of a natural fiber, a synthetic fiber, a composite fiber thereof, or a highly elastic coarse woven or knitted fabric formed by processing a metal net. Even similar functions,
Needless to say, the effect is obtained.

(Embodiment 3) Embodiment 3 of the present invention will be described with reference to FIGS. The same parts as those in the first and second embodiments are denoted by the same reference numerals, and description thereof will be omitted.

FIG. 5 is a cross-sectional view of a main part of a speaker edge according to Embodiment 3 of the present invention, and FIG. 6 is a cross-sectional view showing a state of a composite base material before the speaker edge is hot-molded and pressed. is there.

In FIG. 6, reference numerals 50a and 50b denote a highly elastic film reinforcing material of about 40 microns made of, for example, an ether-based urethane resin colored in black, which does not transmit light, and has a predetermined thickness (for example, 7 mm). ) Cut of ether-based urethane foam base material 51
Is inserted between the film reinforcing members 50a and 50b to form the laminated base material 52.

The edge 60 for the speaker shown in FIG.
Numeral 1 is formed by compression, 61 is a roll portion of a urethane foam edge, and 62 is a flat portion formed continuously on the outer peripheral portion of the roll portion 61, and is joined to a speaker frame (not shown). Is done. Reference numeral 63 denotes a joining portion continuously formed on the inner peripheral portion of the roll portion 61 to which the outer peripheral portion of the diaphragm 64 is joined.

The loudspeaker edge 60 constructed as described above is provided with a 40 micron ether urethane film reinforcing material 50a, 50b colored black and a thickness 7
A test piece 1 formed by cutting a foamed base material 51 made of an ether-based urethane foam colored in black to form a laminated base material 52, and hot-pressed to a thickness of 0.7 mm;
A wet heat degradation test and a weather resistance test were performed using a test piece 2 using a transparent 40-micron ether-based urethane film reinforcing material and a test piece 3 obtained by heating and pressing only a foam-like base material without a reinforcing material. Conditions for wet heat deterioration test: temperature: 7
0 ° C., humidity: 95%, standing time: 1500 hours. As a result, in the comparison between the test piece 1 and the test piece 3, the tensile strength was about 3.3 times, and there was no change even after the test. The elongation rate of the test piece 1 was slightly better than that of the test piece 3, the test piece 1 hardly changed before and after the test, and the test piece 3 deteriorated about 10% after the test.

The weather resistance test was carried out at a temperature of 60 ° C. and a time of 300 hours. There was a clear superiority in the order of test piece 1, test piece 2, and test piece 3.

As described above, a reinforcing material for a highly stretchable film made of an ether-based urethane resin colored in black, which does not transmit light, is disposed, and a foam-like base of an ether-based urethane foam cut to a predetermined thickness is provided. By inserting a material between the film reinforcing materials to form a laminated base material and forming it by a heat molding press, 1) Utilizing the elasticity of the urethane foam in the deformed state at the time of large amplitude of the urethane foam In addition to preventing the occurrence of wrinkles and wrinkles, the urethane foam edge 60 has a large tensile strength at the limit of elongation of the reinforcing members 50a and 50b made of a highly stretchable film disposed inside the cross section in the state of tension acting on the edge. And can prevent breakage of the urethane foam edge 60 at the edge amplitude limit, ) Speaker edge that can prevent the hydrolysis of urethane foam by suppressing air permeability, moisture absorption, and transmission of light (ultraviolet light), prevent breakage of molecular level chains due to ultraviolet light, and prevent mechanical deterioration of urethane foam. Can be provided.

From the above contents, the effects are the effects described in the first and second embodiments, 1) prevention of generation of abnormal sound due to abnormal deformation with respect to vibration amplitude, and 2) prevention of strenuous phenomenon at marginal displacement. In addition to preventing speaker edge breakage, 3) a speaker edge capable of preventing hydrolysis and mechanical deterioration of urethane foam due to chemical change due to ultraviolet light because urethane foam is not exposed to moisture and ultraviolet rays. It is.

In the third embodiment of the present invention, the reinforcing members 50a and 50b are arranged on the front and back of the foam base member 51. However, when the reinforcing members 50a and 50b are arranged on one side, they are exposed to a humid atmosphere and irradiated with light. In the case of urethane foam having resistance to hydrolysis and ultraviolet irradiation, the function and effect of the reinforcing material 50 can be at least on one side, or even if an intermediate layer of the foam base material 51 is provided and arranged. Is of course included in the technical category.

[0046]

As described above, the loudspeaker edge of the present invention has a higher elasticity than a foamed base material such as urethane foam and a material obtained by molding the foamed base material,
A fiber having a high tensile strength at the tensile limit, a woven or knitted fabric having a high tensile strength, or a reinforcing material such as a resin film is foamed or impregnated with a urethane foam resin liquid and then cut into a predetermined thickness. By forming a composite base material formed by laminating a foamed base material and a reinforcing material by laminating etc., the occurrence of abnormal deformation such as ecbo and wrinkles in the deformation state of the edge at the time of large amplitude is suppressed It is possible to provide a speaker edge capable of preventing breakage even when the edge is repeatedly stretched at the limit amplitude.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a speaker edge according to a first embodiment of the present invention;

2A is a cross-sectional view of an initial state of the composite base material of the speaker edge. FIG. 2B is a cross-sectional view showing a state of the composite base material before the speaker edge is heated and pressed. Sectional view showing the state of the composite base material before the edge for speaker is hot formed and pressed.

FIG. 3 is a sectional view of an essential part of a speaker edge according to a second embodiment of the present invention.

FIG. 4 is a cross-sectional view showing a state of the composite base material before the edge for the speaker is subjected to hot forming press.

FIG. 5 is a sectional view of a main part of a speaker edge according to a third embodiment of the present invention.

FIG. 6 is a cross-sectional view showing a state of the composite base material before the edge for the speaker is hot formed and pressed;

FIG. 7 is a cross-sectional view of a roll portion of a conventional urethane foam edge.

FIG. 8 is a diagram showing a raw material of a conventional urethane foam for a speaker edge;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Reinforcement material 11 Urethane foam resin liquid 12 Foam urethane 13 Foam composite base material (a) 14 Membrane part 15 Foam composite base material (b) 20 Edge for speaker 21 of Embodiment 1 21 Roll of urethane foam edge Part 22 Plane part 23 Joint part 24 Diaphragm 30 Edge for speaker 31a, 31b Foam-shaped base material 32 Laminated base material 50a, 50b Highly stretchable film reinforcing material 51 Foamed base material 52 Laminated base material 60 according to second embodiment Edge for speaker 61 of Embodiment 3 Roll part of urethane foam edge 62 Flat part 63 Joint part 64 Diaphragm

 ────────────────────────────────────────────────── ─── Continued from the front page (72) Inventor Masatoshi Okazaki 1006 Kazuma Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. F-term (reference) 5D016 AA12 CA03 DA02 EA01 EA10 EC10 EC22 HA06 JA03

Claims (11)

[Claims] 1. A foam base comprising at least urethane foam, and a reinforcing material having a higher elasticity than a material obtained by molding the foam base and having a high tensile strength at a tensile limit. Edges for loudspeakers formed by hot molding and pressing of the composite base material. 2. A foamed base material obtained by impregnating a urethane foamed resin liquid into a foamed reinforcing material made of a natural fiber, a synthetic fiber or a woven or knitted fabric having a high elasticity processed and formed from a composite fiber thereof is heated. Edge for speaker formed by molding press. 3. The speaker edge according to claim 2, wherein a metal mesh or a mesh structure made of a heat-resistant resin material is used as the reinforcing material. 4. The speaker edge according to claim 2, wherein a plurality of reinforcing members are arranged in a tangential direction or a radial direction. 5. The loudspeaker edge according to claim 2, wherein the foamed base material from which the film parts on the front and back are removed is formed by heating and pressing. 6. A reinforcing material made of a highly stretchable film is inserted into at least the front surface, the back surface, or an intermediate layer of a plurality of urethane foam base materials cut into a predetermined thickness. Edge for loudspeaker formed by press-forming the laminated base material. 7. The speaker edge according to claim 6, wherein a black ether-based urethane film is used as the film. 8. A foamed urethane foam base material obtained by cutting a reinforcing material made of a natural fiber, a synthetic fiber, or a highly elastic coarse woven or knitted fabric formed of a composite fiber thereof into a predetermined thickness. A loudspeaker edge formed by heating and pressing a laminated base material inserted into the front or back surface or an intermediate layer of a plurality of urethane foam base materials. 9. A foamed urethane foam base material cut to a predetermined thickness using a metal net having a mesh structure or a heat-resistant resin material as the reinforcing material according to claim 8, or a plurality of urethane foams. An edge for a speaker formed by heating and pressing a laminated base material inserted into an intermediate layer of the foam base material. 10. The foamed urethane for forming the foam-like base material is made of an ether-based material, and black urethane foam is used. Or the speaker edge according to claim 8. 11. The urethane fiber forming the reinforcing material is made of ether urethane fiber, and black urethane fiber is used as the urethane fiber. Edge for speaker.