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JPH06225388

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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 JPH06225388
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker having a polypropylene cone, and more particularly to a speaker having a polypropylene
cone having an annular elastic edge firmly bonded to its periphery.
[0002]
2. Description of the Related Art Loudspeakers having a cone with an annular elastic edge
bonded to the periphery are conventionally used everywhere. An annular edge formed of a
rubber elastic body, paper, or the like is usually adhesively disposed on the periphery of the
cone. The annular edge plays an important role in accurately converting the input electric signal
into vibration, and in particular, it is made of a material having an excellent loss factor, linearity
and vibration characteristic. It is desired. As those excellent in their properties, elastic bodies
such as NBR, butyl rubber, thermoplastic elastomer, polyurethane rubber, etc. are employed, but
it is found that particularly when silicone rubber is employed, favorable results are obtained in
damping properties etc. The
[0003]
On the other hand, the cone also radiates the vibration of the vibrator accurately as a sound
wave, and is conventionally made of many materials. Among them, in particular, polypropylene is
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light in weight, good in moldability and inexpensive, and is widely known as a material of a
speaker cone.
[0004]
However, the polypropylene is a polymer mainly composed of carbon and hydrogen and
extremely hard to be adhered, and the polypropylene and the elastic body, particularly silicone
rubber, are not easily adhered, and both are firmly adhered, The proposal of the technology in
which the characteristic as a speaker is maintained was awaited.
[0005]
SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a
loudspeaker with improved characteristics and improved performance of the annular edge
adhesively arranged at the periphery of the cone.
Another object of the present invention is to provide a speaker having a polypropylene cone in
which an annular elastic body edge is strongly adhered to the periphery.
[0006]
[Means for Solving the Problems] The present invention has been proposed to achieve the above
object, and at least one of the adhesive surfaces of a polypropylene cone or an annular elastic
edge is subjected to corona discharge treatment or The plasma treatment is based on the finding
that polypropylene can be strongly adhered to an annular elastic body edge, and the function as
a speaker can be maintained. That is, according to the present invention, in the speaker in which
the annular elastic body edge is adhered to the peripheral portion of the polypropylene cone, at
least one adhesion surface of the annular elastic body edge or the polypropylene cone is
subjected to corona discharge treatment or plasma A speaker is provided, characterized in that it
is processed.
[0007]
DETAILED DESCRIPTION OF THE INVENTION The present invention will be specifically
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described below. Referring to FIGS. 1 and 2 which show a preferred example of a cone to which
the annular elastic body edge according to the present invention is adhered, the preferred cone
of the present invention is made of silicone rubber at the periphery of a polypropylene cone (1)
The edge (2) has a configuration in which the adhesive is disposed. The cone and the edge are
bonded with an adhesive (3).
[0008]
The polypropylene of the present invention means a so-called propylene polymer. That is, it
means a propylene homopolymer or a copolymer of propylene and a monomer copolymerizable
with the propylene. The copolymerizable monomer is preferably an olefin such as ethylene or
butene.
[0009]
The cyclic elastic body edge bonded and disposed on the periphery of the polypropylene cone
may be, for example, an elastic body such as NBR, butyl rubber, thermoplastic elastomer,
polyurethane rubber and the like. Among them, silicone rubber is particularly useful. The silicone
rubber is preferably, for example, a polymer prepared by hydrolyzing dimethyldichlorosilane in a
solvent to obtain a cyclic oligomer and then polymerizing the oligomer in the presence of an
alkali.
[0010]
In the present invention, there is an important feature in corona discharge treatment or plasma
treatment of the surface of the propylene polymer, the surface of the annular elastic body or
both in order to enhance the adhesion of the cone. In corona discharge treatment, a high voltage
is applied to an object to be treated disposed between two electrodes, and the surface of the
object to be treated is positively reacted with ozone or various nitrogen oxides which have
generated corona. is there. Specifically, a high pressure generator is disposed at a distance of
several millimeters from the surface of the object to be treated, and the treatment is performed
under the conditions of 250 to 2,000 W / m 2 / min.
[0011]
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In the present invention, plasma treatment may be employed instead of corona discharge
treatment. In the plasma treatment, the surface of the object to be treated is positively reacted by
utilizing excited molecules, ions and the like generated as a result of dissociation of oxygen
molecules and the like by plasma discharge. Specifically, an object to be treated is placed in a
chamber, argon, oxygen, nitrogen gas and the like are enclosed under reduced pressure, and a
high voltage is applied to bring the gas in the chamber into a plasma state. As the conditions at
that time, for example, the pressure is preferably set to 0.01 to 1 Torr, discharge frequency 20
KHz, discharge current 30 to 50 mA, and processing time 0.5 to 3 minutes.
[0012]
The surface-treated polypropylene cone and the annular elastic edge are usually adhered using
an adhesive. As the adhesive, any adhesive may be used as long as it can sufficiently bond the
two without impairing the performance of the speaker. Specifically, silicone adhesives can be
mentioned.
[0013]
In addition, when bonding, if a primer is previously apply | coated to the polypropylene-made
cone or cyclic | annular elastic-body edge surface, both can be more strongly adhered. Examples
of the primer include polyolefin based primers and silicone based primers.
[0014]
In addition, when the conventional compounding agent such as an inorganic filler is added to the
silicone rubber, more preferable characteristics can be obtained. Examples of the inorganic filler
include fumed silica, precipitated silica, diatomaceous earth, quartz powder, graphite and the like.
The amount thereof is in the range of 10 to 100 parts by weight with respect to 100 parts by
weight of the component (a).
[0015]
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According to the present invention, it has become possible to provide a speaker having a
polypropylene cone in which an annular elastic body edge is strongly adhered to the periphery.
The speaker has significantly improved performance because the elastic edge with excellent
characteristic value, particularly the silicone rubber edge, is firmly bonded to the periphery of the
cone.
[0016]
EXAMPLES The present invention will be described more specifically by the following examples,
but it goes without saying that the present invention is not limited to these examples. At the
periphery of a polypropylene cone having a radius of 15 cm, only the adhesive coated portion
was exposed and the other portion was masked, and then subjected to corona discharge
treatment at room temperature under the condition of 1,000 W / m 2 / min. A polyolefin primer
was applied to the surface-treated polypropylene peripheral portion and dried. Then, a siliconebased adhesive was applied, and the annular silicone rubber edge was superimposed on the
adhesive surface, whereby the annular silicone rubber edge could be strongly adhered to the
periphery of the polypropylene cone. The results are shown in Table 1.
[0017]
Example 2 A polypropylene cone having a radius of 15 cm was placed in a chamber, argon gas
was introduced under reduced pressure, and plasma treatment was performed. The conditions
are as follows. Pressure 0.1 Torr, discharge frequency 20 KHz, discharge current 35 mA,
processing time 2 min. The surface-treated polypropylene cone was subjected to the same
operation as in Example 1 to strongly bond the annular silicone rubber edge to the periphery of
the polypropylene cone. The results are shown in Table 1.
[0018]
Comparative Example 1 The same procedure as in Example 1 was carried out except that a
corona discharge treatment was not performed, and a silicone rubber edge was adhered to a
polypropylene cone, but adhesion between the polypropylene cone and the above-mentioned
silicone rubber edge was observed. It was weak and not usable. The results are shown in Table 1.
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[0019]
: Adhesive strength is 90 ° peel strength, and tensile speed is 50 mm / min. It conformed to (JIS
K 6301).
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