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JPS5239286

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DESCRIPTION JPS5239286
■ Method of manufacturing a diaphragm for a speaker ■ Japanese Patent Application No. 51117252 [phase] Application No. 44 (1969) April 3rd, Japanese Patent Application No. 44-25996
division 0 Inventor May Woman Hiromi Hamamatsu City Nakazawacho 7 5 @ Filing application
Japanese musical instrument manufacturing Nakazawacho Hamamatsu 10 1 [presence] agent
patent attorney Ryoji Suse
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing a speaker
diaphragm made by the manufacturing method of the present invention, FIG. 2 is a crosssectional view showing a part of the same, and FIG. FIG. 4 is a cross-sectional view showing a
deformation of a diaphragm made by the manufacturing method of the present invention.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of
manufacturing a speaker diaphragm. Conventionally, in a diaphragm made of foamed resin such
as polystyrene foam, after the diaphragm is molded, a hole for attaching a voice coil is made in
the center part, or a groove for voice coil attachment is made in the center part of the diaphragm.
I made it and attached the voice coil to this part by adhesion. Such conventional diaphragms have
the following disadvantages. (1) Since the bonding area between the voice coil and the
diaphragm is wide, it is difficult to apply the adhesive uniformly to the entire surface of the
bonding surface and to bond these in a small amount as much as possible. Therefore, a pickling
noise is generated on the adhesive surface. In addition, at the location of the adhesion failure, the
vibration of the voice coil is not transmitted to the diaphragm, which deteriorates the
characteristics. On the other hand, although it is possible to deteriorate adhesion by using a large
amount of adhesive, the level of high noise is lowered due to the [111111] weight of the
adhesive, and the frequency characteristic is degraded or the adhesive is sticking out. There is
also a risk of falling. (2) The productivity is poor because the number of manufacturing steps is
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large and the drying time of the adhesive is required. This is because the material such as
expanded polystyrene dissolves in many solvents, so the type of adhesive that can be used is
limited, and in general, materials that take several hours or more of curing time such as epoxy
resin are used Also, since polystyrene foam is weak to heat, it can not be heat-cured. (3) In the
process of bonding the diaphragm and the voice coil, the voice coil is likely to be deformed and
to be inclined and bonded. This is caused by various causes such as the voice coil being pushed
to one side due to the uneven bonding surface of the diaphragm and the voice coil, and the
shrinkage due to solidification of the adhesive. (4) The method of drawing out the lead wire of
the voice coil is the same as that of the speaker of cone paper, but on the diaphragm, the
operation of soldering tinsel wire to the eyelet like cone paper is a foam diaphragm whose heat is
weak I can not do that, so I am very sorry. The present invention eliminates the problems in the
manufacture of the diaphragm using such foam polystyrene etc., and integrates the voice coil, the
lead wire and other peripheral damping material with the diaphragm when the diaphragm is
molded. In addition, by simultaneously molding, the assembly accuracy of the diaphragm is
improved, the manufacturing process is reduced, and the product quality is improved, that is, the
durability, physical characteristics, design are improved, and the variation is reduced. It aims to
reduce costs.
Hereinafter, the present invention will be described with reference to the drawings. FIG. 1 shows
an example of a speaker diaphragm manufactured by the manufacturing method of the present
invention. In the figure, 1 is a diaphragm, 2 is a [111111] EndPage: 1 cap portion thereof, 3 is a
voice coil bobbin, 4 is a voice coil laid thereon, 5 is a lead of the voice coil, 6 is a tinsel wire, 7
Reference numeral 8 denotes a vibration damping material made of a rubber-like elastic material
attached to the periphery of the diaphragm in order to apply a damping action to the diaphragm
to improve frequency characteristics, and 8 denotes a speaker frame attached to the diaphragm.
The diaphragm manufactured by the manufacturing method of the present invention is
characterized in that the voice coil bobbin 3, the tinsel wire 6, the peripheral damping material 7
and the like are integrally formed with the diaphragm 1 itself. In the figure, reference numeral 9
denotes an eyelet for holding the lead wire 5 and the tinsel wire 6 on the bobbin 3. FIG. 3 shows
a mold used for carrying out the manufacturing method of the present invention, in which 10 is
an upper mold, 11 is a lower mold, and 12 is a lower mold for forming a cap portion of a
diaphragm. Reference numeral 14 denotes a shield elastic clamp ring, 15 denotes a shield elastic
clamp, and 16 denotes a clamp screw that clamps the voice coil bobbin from the inside and the
outside. When forming a diaphragm. The voice coil 4 is wound around the voice coil bobbin 3
and the upper end of the lead wire 5 is fixed to the top of the bobbin by the eyelet 9 as shown in
FIG. 3 between the shield elastic bodies 13 and 13 provided on the lower mold 11, the shield
elastic body 13 is attached to the inner and outer surfaces of the bobbin 3 by the tightening ring
14, and the above-mentioned tinsel wire 6 is attached to the lower mold 11. Leading from the
upper end of the clamping screw 16 and down through the clamping screw. Therefore, the shield
elastic body 15 is tightened around the tinsel wire by tightening the tightening screw. Moreover,
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the vibration damping member 7 is disposed at the periphery of the lower mold. Here, a foam
bead is loaded on the lower mold, and the upper mold 10 is placed on the lower mold to heat it,
whereby the diaphragm is formed. At this time, it is preferable to attach the mold to a hot plate
press and heat mold it, but it is also possible to embed a heater in the mold and heat it, or even if
the mold is put in steam or hot water. Good. However, when using steam or hot water, it may be
necessary to make the bobbin not wet or to make the bobbin itself water resistant such as
aluminum or plastic. In the manufacturing method of the present invention, at the time of the
above molding, the connection between the voice coil bobbin and the diaphragm and the
vibration damping are carried out by charging the foamed beads and the [111111] binder such
as epoxy resin into the mold and heating. The joint portion of the material and the diaphragm
can be simultaneously adhesively molded by the adhesive force of the epoxy resin.
When such a binder is not used, a certain strength can be obtained by applying an adhesive to
the portion to be bonded before molding. In the diaphragm of FIG. 1, the tinsel wire connected to
the voice coil is drawn from the middle of the diaphragm to the back side, but as shown in FIG.
You may pull it out. Since the present invention has the above-described configuration, the
following effects can be achieved. 1) Since the diaphragm, the voice coil, the lead wire of the lead
wire, the damping material, etc. are integrally formed and L-shaped, the number of assembly
steps of the speaker is reduced and the assembly becomes very easy. (2) As an adhesive used at
the time of assembly can be used as a quick-drying adhesive, the assembly time can be extremely
shortened. (3) When assembling, the conventional ones do not adhere to the diaphragm and the
voice coil bobbin, which are hard to meet each other, and lead wires are pulled out, making it
easy to do. '4) Since the entire vibration system is integrally formed, the dimensional accuracy of
the vibration system is increased, the assembly curling is eliminated, and the voice coil contact
and the like are reduced. (5) Since the diaphragms are manufactured under uniform conditions,
variations in the quality of the finished speaker can be eliminated 0 ° 6) The connection
between the diaphragm and the voice coil is perfect, resulting in improvement of the speaker
characteristics. (7) Since the diaphragm and the voice coil are connected with the minimum
adhesive and with the maximum adhesive strength, the level of medium and high sound does not
decrease due to the weight of the adhesive and the adhesive It also becomes less likely to
produce high-tone peaks due to influences such as. (8) The adhesion between the peripheral
damping material and the diaphragm is a problem such as workability, a restriction that it must
be an adhesive that does not dissolve the diaphragm such as polystyrene foam, and a problem
with the characteristics (speaker like) In terms of point, it was convenient to use the one with
pre-coated adhesive, but the cost of the adhesive was very expensive and expensive. If
manufactured by the manufacturing method of the present invention, the adhesive is not
required [111111] EndPage: 2, which results in cost reduction. The adhesion is also more
complete and does not come off. (9) As described above, according to the present invention, it is
possible to provide a speaker having extremely excellent characteristics and durability, which is
very easy to manufacture, and to reduce the manufacturing cost.
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