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JPH11355895

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DESCRIPTION JPH11355895
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
method of manufacturing a speaker diaphragm used in various acoustic devices.
[0002]
2. Description of the Related Art A conventional method of manufacturing a diaphragm for a
speaker will be described using a polyolefin-based polyethylene diaphragm.
[0003]
Among polyolefins, polyethylene-based speaker diaphragms have the feature that material
density is low and weight reduction of the speaker diaphragm can be achieved, and internal loss
against mechanical vibration is also relatively large, so that the frequency characteristics of the
speaker become good. Although widely used, due to poor adhesion, it has been essential to
activate the surface of the speaker diaphragm to improve adhesion.
[0004]
The method conventionally used to activate the surface of the speaker diaphragm 4 is a method
of applying a primer after corona discharge and parallel plate electrodes 20 and 21 as shown in
FIGS. 7 and 8. It is generally known that the surface treatment of the speaker diaphragm 4 is
performed by the gas plasma processing method using the.
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[0005]
However, the conventional techniques for surface activation of speaker diaphragms by surface
treatment have the following disadvantages.
[0006]
That is, in the method of activating the surface by corona discharge and applying the primer,
only the portions where the electrodes 20 and 21 are in proximity are activated, and if the
electrodes are small, the wettability of the speaker diaphragm 4 will vary and the large size The
processing time is approximately 30 seconds on one side of the speaker diaphragm 4 and it is
necessary to invert the work or invert the speaker diaphragm 4 to process the other side as well.
It takes one minute or more per sheet, which is very bad productivity.
[0007]
Furthermore, the temperature in the reaction furnace is raised to a high temperature of 80 ° C.
or more, and the diaphragm is deformed during corona discharge.
[0008]
Further, the one using the parallel plate type electrode 20 in FIG. 7 has problems in the
possibility of thermal deformation and productivity of the speaker diaphragm 4, and the one
using the parallel plate type electrode 21 in FIG. Although the productivity of the speaker
diaphragm 4 is solved, it has the possibility of thermal deformation, and has a problem that the
difference in wettability between the peripheral portion and the central portion of the speaker
diaphragm 4 is remarkable.
[0009]
The present invention solves the above-mentioned problems, and provides a method for
manufacturing a speaker diaphragm having stable quality and high productivity.
[0010]
[Means for Solving the Problems] In order to solve the above-mentioned problems, in the method
of manufacturing a diaphragm for a speaker according to the present invention, a resin
diaphragm for speaker made of injection molding or sheet heat molding is disposed in a reaction
vessel. An electrode is provided on the outside of the reaction tank, and the temperature in the
reaction tank is kept below the thermal deformation temperature of the speaker diaphragm to
perform plasma processing on the speaker diaphragm to activate the surface. By providing an
electrode on the outside of the reaction tank, the temperature in the reaction tank is made equal
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to or lower than the thermal deformation temperature of the speaker diaphragm, and the speaker
diaphragm is subjected to plasma processing. Thermal deformation is prevented, and the
occurrence of defects due to thermal deformation can be suppressed.
[0011]
DETAILED DESCRIPTION OF THE INVENTION According to the first aspect of the present
invention, a resin-made speaker diaphragm made of injection molding or thermoforming of a
sheet is disposed in a reaction vessel, and an electrode is formed on the outside of the reaction
vessel. The plasma processing is performed on the speaker diaphragm to activate the surface by
setting the temperature in the reaction tank below the thermal deformation temperature of the
speaker diaphragm, and the reaction in which the speaker diaphragm is disposed. Since the
electrodes are provided on the outside of the tank and the plasma processing is performed, the
temperature in the reaction tank is kept below the thermal deformation temperature of the
speaker diaphragm, the thermal deformation of the speaker diaphragm is prevented, and the
generation of defects due to the thermal deformation Can be suppressed.
[0012]
In the invention according to claim 2 of the present invention, a plurality of speaker diaphragms
made of resin are arranged so as to be spaced apart so that plasma processing can be
substantially uniformly performed in the metal mesh frame arranged in the reaction vessel. The
speaker diaphragm according to claim 1 is manufactured, and the surface is substantially
uniformly activated because the gas diffuses into the reaction tank substantially uniformly
through the metal mesh, and it is used as the speaker diaphragm. It has high wettability and
stable quality.
[0013]
The invention according to claim 3 of the present invention is the method for producing a
diaphragm for a speaker according to claim 1 or 2, wherein an isocyanate-based primer is
applied after plasma treatment, and the adhesion improvement and the quality are further
improved. The stability of the
[0014]
In the invention according to claim 4 of the present invention, the material or the copolymer of a
polyolefin resin such as polyethylene or polypropylene, or the material or a copolymer of a
polyamide resin is used as the material of the diaphragm for a speaker. The method for
manufacturing a speaker diaphragm according to any one of claims 2 and 3, wherein the
improvement in adhesion and the stability of quality can be obtained with the speaker diaphragm
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in a very wide range.
[0015]
Hereinafter, an embodiment of a method for manufacturing a speaker diaphragm of the present
invention will be described with reference to FIGS. 1 to 3.
[0016]
FIG. 1 is a perspective view for explaining plasma processing of a speaker diaphragm according
to an embodiment of a method of manufacturing a speaker diaphragm of the present invention,
and FIG. FIG. 3 is a cross-sectional view for explaining the arrangement of diaphragms, FIG. 3 is a
temperature change diagram during continuous operation of the quartz reaction tank, and FIG. 4
is a corona discharge treatment of the present embodiment of the speaker diaphragm and the
conventional corona discharge treatment. It is a comparison comparison of wettability with
[0017]
According to the figure, 1 is a cylindrical quartz reaction vessel, and a cylindrical aluminum
etching tunnel 2 with mesh processing is provided inside, and a speaker held by a diaphragm
fixing jig 3 inside thereof The diaphragms 4 are juxtaposed at substantially equal intervals.
Reference numeral 6 denotes a gas inlet provided in the reaction tank 1, and the reaction gas A
flows from the gas inlet 6 into the reaction tank 1 through an etching tunnel 2 formed of an
aluminum mesh.
The reference numeral 5 denotes an electrode, which is provided in two pairs facing the outside
of the reaction vessel 1.
Reference numeral 7 denotes a gas exhaust port.
[0018]
Furthermore, to describe the method for manufacturing the speaker diaphragm 4 using the
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above-mentioned reaction tank 1 more specifically, super high molecular weight polyethylene
resin "Lubmer" manufactured by Mitsui Petrochemical Industries, Ltd. is used as the speaker
diaphragm 4 The speaker diaphragm 4 having a diameter of 16 cm was formed by injection
molding or composite molding using a high-speed injection molding machine.
The properties of this resin are shown in Table 1.
[0020]
As apparent from (Table 1), the thermal deformation temperature of this resin is 82 ° C., and
when the temperature of the reaction tank 1 becomes 80 ° C. or more, there is a risk that the
speaker diaphragm 4 may be deformed. .
[0021]
The size of the reaction vessel 1 of quartz was 300 mm in diameter and 500 mm in length, and
as shown in FIG. 2, 30 speaker diaphragms 4 of 16 cm diameter were arranged at intervals of 15
mm.
The reaction gas A used oxygen gas.
The suction time was 1.5 minutes for vacuuming under the conditions of a vacuum degree of 0.9
torr and a high frequency output of 500 W, the plasma treatment time was 1 minute, and the
normal pressure return was 1.5 minutes for about 4 minutes per cycle.
The temperature change during continuous work under the above conditions is shown in FIG.
As apparent from FIG. 3, the temperature in the reaction vessel is stable at about 45 ° C. even
during continuous operation for 12 hours, and the speaker diaphragm 4 is not deformed.
[0022]
The wettability of the speaker diaphragm 4 obtained as described above is 50 dyn / cm or more
at any part of the speaker diaphragm 4, and the plasma processing can be performed more
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uniformly by the mesh etching tunnel 2. Conceivable.
[0023]
In order to further improve the quality, an isocyanate "Takenate M402" manufactured by Takeda
Chemical Industries, Ltd. was used as a primer.
The wettability is shown in FIG.
[0024]
As clearly shown in FIG. 4, the wettability B immediately after the treatment is relatively high at
46 dyn / cm by the method of applying the primer after the conventional corona discharge, but it
degrades with time, and after 200 hours it is about 36 dyn / cm. Falls down.
[0025]
What applied the above-mentioned primer to the plasma processing of this embodiment is as
shown as a characteristic C in FIG. 4, the wettability is as high as 50 dyn / cm immediately after
the treatment, and as high as 44 dyn / cm even if time passes. It was confirmed that the sex was
maintained and stable.
[0026]
Next, as shown in FIGS. 5 and 6, after applying a primer to the plasma treatment of the present
embodiment, the speaker diaphragm 4 is bonded to the voice coil 10 and the edge 11 with the
adhesives 12, 13. After applying a primer to the conventional corona discharge, a voice coil and
an edge were adhesively bonded to make a strength comparison.
[0027]
The voice coil 10 shown in FIG. 5 has a diameter of .phi.32, and the adhesive 13 is joined and
fixed to the speaker diaphragm 4 using a two-component reactive acrylic adhesive, and the voice
coil is pulled in the direction of the arrow. , Adhesive strength was measured.
[0028]
Further, an edge 11 shown in FIG. 6 is made of a rubber material, and the speaker diaphragm 4
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is bonded to the adhesive 12 using a butyl rubber-based solvent type adhesive to provide an
adhesive surface of 25 mm wide and 5 mm long. The peel strength test was done.
[0029]
Moreover, the speaker of a 16 cm aperture was produced using the voice coil 10 and edge 11 of
above-mentioned (phi) 32, and the input-proof test was done.
The above test results are shown in Table 2.
[0031]
As apparent from the results of Table 2, it is confirmed that the adhesive strength is better in the
present embodiment.
In addition, while the failure mode in the input resistance test causes adhesion peeling at the
input of 70 W to the conventional one in the conventional one, the burnout of the voice coil 10
occurs at 120 W in the present embodiment, and the adhesion is It was confirmed to have very
high adhesion without peeling.
[0032]
In addition to oxygen gas as reaction gas A, substantially the same results were obtained in
nitrogen gas and air.
Almost the same effect was obtained with polypropylene and nylon resins as the material of the
speaker diaphragm 4.
[0033]
As described above, in the present embodiment, the electrode 5 is provided outside the reaction
tank 1 to perform plasma processing to suppress the temperature rise in the reaction tank 1 to
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prevent the thermal deformation of the speaker diaphragm 4, and further By mounting the
speaker diaphragm 4 in a metal mesh frame, it becomes possible to perform plasma processing
uniformly, and productivity is also improved.
[0034]
According to the above-described method of manufacturing a speaker diaphragm of the present
invention, it is possible to provide a method of manufacturing a speaker diaphragm with high
productivity while preventing thermal deformation.
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