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JPH0666196

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DESCRIPTION JPH0666196
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker having a movable cone, and more particularly to a speaker having a cone to which an
edge made of annular silicone rubber foam is adhered at the periphery.
[0002]
2. Description of the Related Art A speaker having a cone made of paper, resin or rubber with an
annular edge adhered to its periphery has been widely used. Among the materials of these cones,
polypropylene is light in weight, good in formability and inexpensive, and is widely known as a
material of a speaker cone.
[0003]
An annular edge composed of a rubber elastic material such as butyl rubber, polyurethane
rubber, NBR, etc. is adhesively disposed on the periphery of the cone. The adhesively arranged
annular edge plays an important role in accurately radiating the vibration of the vibrator as a
sound wave, and is lightweight, and in particular, it has a loss factor, linearity, vibration
characteristics, etc. It is desirable to be manufactured from materials that are superior. However,
rubber elastic bodies, etc., which have been known as the material of the annular edge
conventionally known, do not have sufficient physical property values such as loss factor and
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vibration characteristics, but have proposed a material with better performance. I was waiting for
you.
[0004]
The inventors of the present invention have already found that silicone rubber is effective as a
result of research on materials capable of satisfying the above-mentioned characteristics.
Although the speaker using the silicone rubber has excellent characteristics, if it is strong, there
are still some problems with the noise reduction and the lightness. That is, it is preferable that
the vibration of the vibrator is transmitted to the edge and once it is vibrated, the vibration of the
edge is damped (silenced) by the time the next vibration is input, and the next vibration is not
affected. When the silicone rubber is used, it has been desired to improve its muffling properties.
Moreover, if the edge is lightweight, the edge can be vibrated at a lower output, but the silicone
rubber still has room for improvement in lightweight.
[0005]
SUMMARY OF THE INVENTION Therefore, the present invention aims to solve the abovementioned problems, and the performance, particularly the muffling ability, of the annular edge
adhesively arranged on the periphery of the cone is improved. The purpose is to provide a
speaker that brings excellent characteristics.
[0006]
[Means for Solving the Problems] The present invention has been proposed to achieve the above
object, and when the silicone rubber foam is adopted as the material of the annular edge, the
muffling ability is It is based on the finding that an improved speaker is obtained.
That is, according to the present invention, there is provided a speaker having at least a cone
having an annular edge adhered to the periphery, wherein the edge is made of silicone rubber
foam.
[0007]
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DETAILED DESCRIPTION OF THE INVENTION The present invention will be specifically
described below. Referring to FIGS. 1 and 2 which show preferred examples of the edge-bonded
cones of the present invention, the preferred cones of the present invention are silicone rubber
foam edges (the edges of the polypropylene cone 1) 2) has a configuration in which adhesion is
arranged. The cone and the edge are bonded with an adhesive (3). In the present invention, there
are important technical features in using silicone rubber foam as a material of annular edge. The
foam may be an open cell or a closed cell, preferably a closed cell.
[0008]
The silicone rubber foam is usually prepared from a mixture of silicone raw rubber and a
foaming agent. As an example of the production method of this silicone raw rubber, a method of
hydrolyzing dimethyldichlorosilane in a solvent to obtain a cyclic oligomer and then polymerizing
the oligomer in the presence of an alkali can be mentioned.
[0009]
A foaming agent is blended into this silicone raw rubber. As the foaming agent, AIBN can be
exemplified. The blending amount is preferably 0.2 to 7 parts by weight.
[0010]
The cross-sectional shape of the edge for molding and producing an annular edge from this
silicone foam by a known molding method is not particularly limited, but usually, as shown in
FIG. Is preferably provided. Also, the thickness of the edge is optional, but is usually about 0.1 to
3 mm.
[0011]
The cone is molded and manufactured from known materials such as resin, rubber, paper and the
like. Among those materials, in particular, polypropylene is the mainstream. The polypropylene
means a so-called propylene polymer, and means a propylene homopolymer or a copolymer of
propylene and a copolymer copolymerizable with the propylene, and a known method using the
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above-mentioned material as a starting material Form and manufacture a cone.
[0012]
The cone thus obtained and the edge made of silicone rubber foam are adhered using an
adhesive. The adhesive does not impair the performance of the speaker, and any adhesive may be
used as long as it can sufficiently bond the two. Specifically, silicone adhesives can be mentioned.
When a silicone rubber foam is adhered with an adhesive solution, for example, an adhesive
solution is first applied to the surface of a polypropylene cone, an appropriate amount of solvent
is evaporated, and then a silicone rubber foam is overlapped and adhered. Then, the adhesive
solution is prevented from infiltrating the inside of the foam, and a decrease in adhesion can be
prevented.
[0013]
In the present invention, when the cone is adhered to the silicone foaming agent, if the primer is
previously applied to at least one surface of the cone or the silicone rubber foam, the both can be
adhered more strongly. it can. Examples of the primer include polyolefin based primers and
silicone based primers.
[0014]
Further, the addition of a conventional compounding agent such as an inorganic filler to the
silicone foam can provide more preferable properties. Examples of the inorganic filler include
fumed silica, precipitated silica, diatomaceous earth, quartz powder, graphite and the like. The
compounding amount thereof is 10 to 100 parts by weight with respect to 100 parts by weight
of the component (a).
[0015]
In the present invention, in order to enhance the adhesion between the polypropylene cone and
the silicone foam, the surface of the propylene polymer, the surface of the silicone rubber or both
of them are previously subjected to corona discharge treatment or plasma treatment. It is also
good.
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[0016]
According to the present invention, it has been possible to provide a speaker having a
polypropylene cone with an edge made of an annular silicone rubber foam adhered to the
periphery.
The speaker adopts an edge made of silicone rubber foam having excellent characteristic values,
and since the foam is also lightweight, the performance is remarkably improved, and in
particular, the noise reduction is excellent.
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