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JPH077791

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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
financial decisions, should not be based on machine-translation output.
DESCRIPTION JPH077791
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
loudspeaker and in particular to a drive unit for a loudspeaker.
[0002]
[0002] Although plastic materials such as polypropylene are often selected because they have
good properties for special applications such as loudspeakers, it is possible to make loudspeaker
cones with materials such as paper, plastics and metal sheets. Are known.
[0003]
Conventional polymeric cones are vacuum formed from the sheet by a heating process to soften
the plastic.
In relation to the mold, the material is thinnest at the apex of the cone and has the highest
tension at this location. This is contrary to what is desired, and in fact it is desirable that the neck
of the cone be the most thick and thick, and the rim be a thin area of low mass so as to have a
good end to the drive coil. Preferably, the portion of the cone should be gently tapered in order
to provide a sufficient degree of damping action, while the connection with the flexible border is
the border and the cone It should be such that its presence is imperceptible in order to minimize
coupling wave reflection at the boundary of
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[0004]
The most basic loudspeaker cones have formed around them a crease which constitutes a
support or border on which the cone can move under the influence of drive means, usually
moving coil motors. More advanced loudspeaker cones are provided with a peripheral support,
often known as a roll surround, in the form of a creased member of flexible rubber or other
elastomeric material. Such an elastomeric support is normally obtained by compression molding
a thermosetting elastomeric material and is fixed to the carbon material with an adhesive.
[0005]
However, this requires skilled manual assembly to ensure concentricity and reliable adhesion,
and is therefore laborious and expensive. Usually, this type of assembly is justified as improving
acoustical performance as a result of providing compliant support to the cones.
[0006]
The object of the present invention is to produce without the need for manual assembly such that
it is possible to avoid or at least reduce various conventional manufacturing and performance
variations. It is an object of the present invention to provide an assembly of loudspeaker
loudspeakers and supports or rims.
[0007]
SUMMARY OF THE INVENTION In accordance with the present invention, a loudspeaker cone
and border assembly is provided in which the border is injection molded directly onto the cone.
According to another aspect of the present invention, there is provided a loudspeaker cone and
rim assembly in which the cone is injection molded directly onto the rim. According to this
method, the thickness of the cross section of the cone can be tailored as desired, for example, it
can be tailored to be relatively thick near the central portion and relatively thin near the
peripheral portion.
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[0008]
Preferably, the cone is made of plastic material and the border is made of elastomer. Preferably,
both the cone and the rim are injection molded. The cone is preferably made of polypropylene
polymer and the border is preferably made of styrene-ethylene butylene-styrene polymer. This
combination of materials results in the materials of the cone and the rim bonding together
chemically at the injection molding stage. This chemical bonding can largely avoid the problem of
fracturing that often occurs when using the adhesive in manual cone and border assembly.
[0009]
When assembling the loudspeaker drive unit, it is common to apply an adhesive to the outer edge
of the rim to attach the cone and rim assembly to the chassis. Because the chassis is usually
metal, it is necessary to use a special adhesive such as cyanoacrylate to bond the elastomeric
border to the chassis. Such adhesives are harmful and are prohibited from use in some countries.
Alternatively, an annular paper ring or gasket is secured to the edge of the border using a nontoxic adhesive and a non-toxic adhesive is used to secure the paper ring or gasket to the chassis
Can be This method requires extra effort.
[0010]
According to the present invention, a gasket, such as paper, is molded directly onto the rim
during manufacture of the rim, so as to avoid the need for assembly without the use of harmful
adhesives. Thus, a gasket, such as paper, is placed in the mold before the elastomer is injected to
form the border.
[0011]
The joint between the material of the cone and the material of the border preferably comprises a
polymerised part in order to provide connection strength. If desired, the material of the border
can be polymerized on both sides of the outer edge of the cone. If the appearance of the
loudspeaker is important, it is desirable that the overlap not be visible, in which case the overlap
is only on the back of the cone. Preferably, the junction between the cone and the border is close
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to the edge of the active part of the border, ie the part designed to move during use, and the
material of the border has an adverse effect on the acoustic properties of the cone. The material
of the rim is such that it does not become part of the air drive range of the cone.
[0012]
A further aspect of the present invention is the chemical chemistry of the rim of the cone
material by placing the cone in the cavity of the mold of the injection molding apparatus and
injection molding the border material under heat and pressure around the cone. A method of
manufacturing an assembly of a loudspeaker cone and a flexible rim, which is bonded to
[0013]
Preferably, the cone is made of polypropylene and is injection molded, and preferably, the rim is
made of an elastomeric material.
[0014]
Yet another aspect of the present invention is that the edged material is placed in the cavity of
the mold of the injection molding apparatus and the material of the edged portion is made by
injection molding the carbon material under heat and pressure on the edged edge A method of
manufacturing an assembly of a loudspeaker cone and a flexible rim, which comprises chemically
bonding together.
[0015]
Preferably, the cone is made of polypropylene and preferably the rim is made of an elastomeric
material and is injection molded.
[0016]
One method of manufacturing the loudspeaker horn and flexible rim assembly is to injection
mold a polypropylene cone in the first cavity of the injection molding machine and then change
the shape of the cavity so that the periphery of the cone is A rim cavity is defined that extends
into and chemically bonded to the edge of the cone by injection molding the elastomer within the
rim cavity.
Instead, a cone is first formed in the cavity of one mold and then transferred to the cavity of the
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other mold in which the rim is injection molded onto the cone.
[0017]
The polypropylene used for corn may be a homopolymer or copolymer and may contain a
proportion of a filler such as mica.
The plastic material is selected to have a high melt flow index to allow the material to be molded
in the cavity to have thin sections.
[0018]
The support elastomer is preferably a styrene-ethylene butylene-styrene polymer such as that
sold by Evode Plastics Limited under the registered trademark "Evoprene G".
The elastomer preferably has a Shore A hardness of 40 or less.
[0019]
The injection molding apparatus comprises two injection units and a heating cylinder, one for
injecting the material of the cone into the cavity of the mold and the other for injecting the
material of the support into the cavity of the mold. The following types are preferred.
[0020]
The cones can be molded from plastic materials such as ABS, polystyrene, PVC, nylon or other
rigid polymers.
The border is preferably comprised of styrene-ethylene butylene-styrene, but may be comprised
of flexible PVC or a thermoplastic rubber alloy composition.
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[0021]
As used herein, in the description, the term "coron" refers to any type of air, whether or not
driven by a moving coil or other mechanism, regardless of whether it is flat or conical or
otherwise shaped. It is also used to mean moving devices.
[0022]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT The drawing shows a drive cone
and rim assembly of a loudspeaker having an appearance substantially similar to that of the prior
art, which assembly has a suitable and convenient way of using the inner rim 11 in use. A
loudspeaker drive motor, for example a funnel-shaped drive cone 1 attached to a moveable coil
(not shown), the outer edge 3 of this cone 1 being in the loudspeaker drive unit chassis (not
shown) in any convenient way It is attached to a fixed compliant border or support 2.
In this example, the outer edge 3 of the drive cone 1 is injection molded using polypropylene,
and the flexible elastomeric rim or support 2 having a substantially traditional outer shape is the
outer edge of the drive cone 1 3 is injection molded.
The rim is annular and includes an outer flange 5 attached to a loudspeaker drive unit chassis
(not shown), the portion of the outer flange round roll or bellows 6 being the support of the cone
and the inner flange 7 The inner flange is molded on the back of the cone 1 to polymerize to a
certain extent on the outer edge 3 of the cone. Thus, this polymerized joint is not visible in use.
The outer edge 8 of the cone 1 is preferably arranged close to the round roll or bellows 6 of the
border 2 so that the border does not adversely affect the acoustic properties of the cone.
[0023]
The material of the border 2 is chemically bonded to the polypropylene cone under the heat and
pressure of the injection molding process to form an integral unit, thereby providing the cone
and border as conventionally required. Styrene-Ethylene-Butylene-Styrene which avoids the need
to glue together. In this method, it is easier to align the edge with the cone than in the case of
manual assembly, and the connection between the edge and the edge can be consistently
achieved.
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[0024]
According to the arrangement of FIG. 3, prior to injection molding of the rim 2, the paper gasket
10 is placed in the mold so that the paper gasket 10 is bonded to the outer flange 5. In this way,
the cone and border units can be secured to the drive unit chassis (not shown) using
conventional non-toxic adhesives.
[0025]
As described above, according to the present invention, novel cone and border assemblies can be
provided which can be manufactured much more efficiently than in the prior art. Also, according
to the present invention, a loudspeaker having excellent acoustic characteristics can be provided
relatively inexpensively.
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