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JP2000261883

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JP2000261883
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the
edge of a diaphragm used in a speaker.
[0002]
2. Description of the Related Art Conventionally, as shown in FIG. 5, a diaphragm 1 of this type is
supported by a frame (not shown) via an edge 2 '. The material of the edge 2 'is one using a
rubber material.
[0003]
The conditions required for the edge 2 ′ include, for example, the presence of stiffness (rigidity)
and the lightness.
[0004]
In this case, in order to increase the rigidity of the edge 2 'to control the stiffness of the edge 2'
made of a rubber material, the hardness or thickness of the material should be increased.
Conceivable.
[0005]
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1
However, the hardness of the material does not rise beyond a certain limit due to the
characteristics of the material, and there is a problem that weight increases when the thickness is
increased, and desired performance can not be obtained.
Further, in the case of a speaker with a large input, there is a problem that an accident in which
the edge 2 'is cut often occurs.
[0006]
The present invention has been proposed in view of the above, and an object thereof is to provide
a speaker edge capable of easily obtaining a desired rigidity without an increase in weight so as
to increase the thickness of the rubber. It is in.
[0007]
According to the present invention, the foam rubber edge 3 and the cloth material 4 are
simultaneously molded, and the cloth material 4 is provided on either or both of the upper
surface and the lower surface of the foam rubber edge 3 or inside thereof. The cloth material 4
achieves the above object by impregnating a resin.
[0008]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, in the
case where the main material of the edge is made of a rubber material, the rigidity is increased
and the desired performance is obtained by combining and simultaneously forming the cloth
material.
[0009]
Embodiment 1 FIG. 1 shows a cross-sectional view of a first embodiment of the present invention.
In the figure, 1 is a diaphragm, 2 is an up-roll shaped edge provided on the outer periphery of
the diaphragm 1, and this edge 2 is composed of a foam edge 3 made of a rubber material and a
cloth 4 coated thereon. It is done.
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2
[0010]
In this case, the rubber material and the cloth material are formed by simultaneous molding.
As a raw material rubber, EPDM (brand name "Esprene-505") is used, for example.
And in order to reduce weight to this, the foamed rubber edge 3 obtained by mixing a foaming
agent is used.
Further, as the cloth material, a cloth impregnated with a resin in order to impart durability and
strength to the woven or non-woven fabric is used. As a material of the woven or non-woven
fabric, for example, natural fibers such as cotton and silk, and synthetic fibers such as nylon,
polyester, and aramid are used. As a resin to be impregnated, phenol, melamine, epoxy urethane,
etc. are used. Therefore, the rigidity can be easily controlled appropriately by the wire diameter
and the type of the cloth material, the type of the resin, the degree of the amount of
impregnation, and the like.
[0011]
In manufacturing, using a mold, the diaphragm 1 which is separately formed in advance is
arranged in the mold, and an edge base material (raw rubber, a foaming agent) is arranged on the
lower surface of the cloth 4 made of woven fabric or nonwoven fabric, Heat and pressure
promote vulcanization of the raw rubber and foaming of the foaming agent to form the foamed
rubber edge 3. In this case, the foamed rubber edge 3 and the cloth material 4 are integrally
laminated by the self-adhesion of the material. Edge 2 can be produced.
[0012]
Second Embodiment FIG. 2 shows a second embodiment of the present invention.
This embodiment is characterized in that the cloth material 4 is provided below the foam rubber
edge 3. The other configuration is the same as that of the above-described embodiment.
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3
[0013]
Third Embodiment FIG. 3 shows a third embodiment of the present invention. In this example,
the cloth material 4 is disposed substantially at the center of the foamed rubber edge 3.
[0014]
Fourth Embodiment FIG. 4 shows a fourth embodiment of the present invention. In this example,
the cloth material 4 is provided on the upper and lower surfaces of the foam rubber edge 3
respectively. In this case, since the upper and lower surfaces of the foam rubber edge 3 are
covered with the cloth material 4, the stiffness can be further improved.
[0015]
As described above, according to the present invention, since the cloth material 4 is integrally
laminated on the foamed rubber edge 3, the stiffness of the rubber material is improved by the
cloth material 4 without increasing the hardness or thickness of the rubber material. In addition,
since the breaking strength of the edge is significantly increased as compared with that of the
rubber material alone, it is possible to reduce the edge breakage accident even at the time of
large input.
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4
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