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JPS57206198

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DESCRIPTION JPS57206198
Description 8 Title of Invention
Method of manufacturing acoustic composite diaphragm
3. Detailed Description of the Invention The present invention relates to a method of
manufacturing an acoustic composite diaphragm in which metal foils are adhered to both sides
of a diaphragm base used for a flat speaker etc. The heating and cooling efficiency in the heating
and cooling steps of bonding the metal foil to the both sides directly or indirectly can be
enhanced, as a result of which the heating and cooling time can be shortened and energy saving
can be achieved. The present invention proposes a method of manufacturing an acoustic
composite diaphragm that can reduce the child manufacturing cost. In a speaker, a diaphragm
that mechanically vibrates based on an audio signal supplied to a voice coil is formed into a flat
plate so that sound pressure characteristics and phase characteristics are flat in converting an
electric signal to sound. Flat loudspeakers have been proposed in which improvements are made
such as improving the high frequency characteristic and the like. As a flat-plate-like diaphragm
used for this flat speaker, the acoustic composite diaphragm in which several plate-like members
or foil-like members were laminated | stacked and was formed in one flat plate is used. An
example of the construction of such an acoustic composite diaphragm is as shown in a crosssectional view in FIG. 1 of the drawings, and in this example, aluminum having a light weight and
a predetermined rigidity is used. On both sides of the diaphragm base / which is formed of a
plate etc., thin urethane sheets of thickness O, S ~ / mm or so are attached to the adhesive layer 3
by adhesive layer 3 and further the center On the surface of the urethane sheet λ opposite to
the surface bonded to the diaphragm substrate 1, metal foil such as aluminum foil having a
thickness of about tioμ is bonded by an adhesive layer 3 '. That is, it has a so-called sand-inch
structure in which metal foils such as aluminum foil are bonded via urethane resin to both sides
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of a diaphragm substrate such as an aluminum plate having a honeycomb structure. . Here, the
metal foil forms a substantial acoustic vibration film, so that the urethane resin can suppress
unnecessary high frequency vibration of the metal foil, and the metal foil V is adhered to both
sides of the diaphragm substrate / In order to prevent the adhesive from flowing out from the
end of the adhesive, the molten adhesive is made to penetrate. The above-mentioned urethane
resin may be employed as necessary, and metal foil may be directly adhered to both surfaces of
the diaphragm substrate 1 without using this. In order to form the adhesive layers 3 and 3 ', a
heat melting adhesive sheet in the form of a sheet having no adhesive force at normal
temperature is used to produce the acoustic composite diaphragm having such a configuration.
The heat melting adhesive sheet is placed between the metal foil and the urethane sheet and
between the urethane sheet λ and the urethane sheet λ and the diaphragm substrate l, and
these heat melting adhesive sheets are heated and temporarily melted. Then, it is cooled and
brought into the non-melted state again, whereby adhesion between the metal foil and the
urethane resin and adhesion between the urethane resin and the diaphragm substrate 1 are
made.
In the conventional method, this heating has been performed by an electrothermal heating device
using a nichrome wire or the like. The electrothermal heating apparatus comprises a pair of press
molds heated by electric heating elements of nichrome wire numbers respectively, and bonding
between the pair of press molds is performed on each of both sides of the diaphragm substrate l.
The layer 3, the urethane resin, the adhesive layer 3 'and the metal foil are stacked and disposed,
and the press die is operated and the electric heating element is heated to generate the metal foil
on both sides. The heating of the adhesive layer through the press die has been performed while
the entire die is pressed by the press die. In the heating in such a conventional method, the
heating efficiency is poor because the pressing mold which has a large heat capacity is used to
heat the adhesive layer, so that the heating time is prolonged and consumption is consumed.
There was a drawback that the power was also large. Furthermore, after heating, cooling is
performed to solidify the adhesive layer, but since the press die is also cooled in this cooling step,
a long cooling time is required, and the energy consumption required for cooling is also large.
Had the drawback of becoming In view of these points, in the heating process as described above
required for forming an acoustic composite diaphragm, the present invention introduces a
technique of electromagnetic induction heating to be bonded to both surfaces of the diaphragm
substrate. By heating the foil itself directly, the heating efficiency can be significantly enhanced,
and furthermore, the cooling efficiency can be significantly improved in the cooling step
following the heating step, which is a disadvantage of the prior art. It is an object of the present
invention to provide a novel method of manufacturing an acoustic composite diaphragm in which
the Hereinafter, the present invention will be described with reference to FIGS. 2 and 3 of the
drawings.
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Method of manufacturing acoustic composite diaphragm
The invention will be described in detail. FIG. 2A shows an electromagnetic induction heating
device used in the method of manufacturing an acoustic composite diaphragm according to the
present invention with a side view including a partially broken cross section. , Ta and 5b are a
pair of press molds, which are formed of an electrically insulating material. In the press dies 5a
and tb, work coils Aa and 6b for generating a magnetic field are attached to the press surfaces
facing each other. As shown in FIG. 2B, the work coils 6a and 6b are each formed by winding a
conductive wire in a flat plate / helical form into a disk shape having a central hole, the disk
surface of which is shown in FIG. The center hole is arranged to be positioned approximately in
the middle of the press die 5a or tb so as to be in a plane perpendicular to the paper surface of A.
The terminals g 'and ^ "of the work coils 6a and 6b are connected to the drive circuit unit 7, and
alternating current of a predetermined frequency is supplied from the drive circuit unit 7 to the
work coils 6a and 6b. Although the work coils 6a and 6b generate magnetic flux when the
alternating current from the drive circuit unit 7 flows through the work coils Aa and Ab, the
phase of the alternating current is determined so that the directions of the magnetic flux from
both work coils are aligned. . As a result, a magnetic field due to an alternating magnetic flux is
formed between the word EndPage: 2 and the second coil 6a and 6b, as shown by an arrow of a
dashed dotted line in FIG. 2A. Further, on the opposing surfaces of the press dies 5a and tb,
pressed plates ga and gaps b formed of silico / rubber or polytetrafluoroethylene are respectively
deposited. Furthermore, spiral shaped cooling water pipes 9a and 9b are provided on the press
molds 5a and tb, respectively, from the center to the outside in the plane orthogonal to the paper
surface of FIG. 2A. It communicates to the outside through 10b. / 1 and 12 are cylinders and
pistons, and are provided to move the press die tb closer to or away from the press die j. Next, an
example in which the method of manufacturing the acoustic composite diaphragm according to
the present invention is applied to the manufacture of the acoustic composite diaphragm shown
in FIG. 1 will be described. In the manufacturing method according to the present invention, first,
as shown in FIG. 3A, an adhesive layer 3 comprising a heat melting adhesive sheet, an adhesive
layer 3 'comprising an urethane resin, a heat melting adhesive sheet, and A metal foil such as an
aluminum foil is stacked in this order and placed between the pressing plates ga and gb attached
to the facing surfaces of the press dies 3a and yb of the electromagnetic induction heating device
as shown in FIG. 2A. . Then, the piston / 2 of the electromagnetic induction heating device t is
operated to move the press die yb toward the press die ta, and an alternating current is supplied
from the drive circuit unit 7 to the work coils Aa and 6b.
Thus, the metal foil or the like placed between the pressing plate ga and the gb is pressed in a
state in which the metal foil is in contact with the pressing plate ga and the adhesive layer 3 is in
contact with the pressing plate gb. 9 under the influence of the magnetic fields generated by 6a
and 6b. Here, when the magnetic flux forming this magnetic field passes through the metal foil V,
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an eddy current is generated in the metal foil q, and power loss due to this eddy current, that is,
an eddy current loss occurs to heat the metal foil V itself. Be done. Then, the heat of the heated
metal foil q is transmitted to the adhesive layers 3 'and 3, and the adhesive layers 3' and 3 are in
a molten state. After the adhesive layers 3 and 3 'are sufficiently melted, the supply of the
alternating current from the drive circuit unit 7 to the work coils 6a and 6b is stopped to
complete the first heating step, and then the first cooling Enter the process. In the cooling step,
metal foil is introduced into the spiral cooling water pipes 9a and yb provided on the press molds
ta and b while passing through the cooling water from the cooling pipes lOa and 10b while
continuing the pressed state by the press molds ta and tb. And the adhesive layers 3 and 3 '.
Then, the adhesives 3 and 3 'are cooled to be in the non-melted state again, whereby the
adhesive layer 3 is fixed to one surface of the urethane resin as shown in FIG. A metal foil q is
bonded to the other surface of the toe via an adhesive layer 3 'to form an integrated metal foil
member / 3. Thereafter, the dance mold yb is moved in a direction away from the press mold 5a
to take out the metal foil member / 3. In the heating and cooling steps described above, the
adhesive layer 3 is in direct contact with the pressing plate gb, but since the pressing plate gb is
made of silico / rubber or polytetrafluoroethylene /, it is Even if it is heated and melted, it has no
adhesion to the pressing plate gb. Next, as shown in FIG. 3C, the metal foil members 13 formed
as described above are respectively formed on the adhesive layer 3 side on both sides of the
diaphragm substrate / which is formed of an aluminum plate or the like having a honeycomb
structure, as shown in FIG. Placed between the pressing plates a and gb attached to the opposite
surfaces of the press mold & a and 5b of the electromagnetic induction heating device as shown
in FIG. Do. Then, the piston 7/2 is operated to move the press die tb toward the press die ta, and
an alternating current is supplied from the drive circuit unit 7 to the work coils 6a and 6b. As a
result, the diaphragm base 1 installed between the pressing plate a and the gb and the two metal
foil members 3 arranged on both sides thereof have the λ metal foils which are the outermost
surfaces, the pressing plates ga and It is pressed in a state of being in contact with rb
respectively, and in this state, it is subjected to the action of the magnetic field generated by the
work coils 6a and 6b.
At this time, when the magnetic flux forming this magnetic field passes through both metal foils,
an eddy current is generated in each metal foil q, an eddy current loss due to this eddy current is
generated, and the metal foil q itself is heated. Ru. The heat of the heated metal foils q is
transmitted to the contact EndPage: 3 adhesion layers 3 'and 3 in the respective metal foil
members 3 and 3 into a molten state. Then, after the two adhesive layers 3 in contact with both
adhesive layers 3 and 3 ', in particular, both sides of the vibration base 2 are sufficiently melted,
supply of alternating current from the drive circuit unit 7 to the work coils 6a and 6b To stop the
second heating step, and then enter the second cooling step. In the second cooling step, as in the
first cooling step, cooling water is passed through the cooling water pipes 9a and 9b while
continuing the pressing by the pressing dies & a and & b. Then, the respective adhesive layers 3
and 3 'are cooled to be in a non-melted state, and the urethane sheet 2 and the metal foil q are
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respectively attached to the both sides of the diaphragm substrate / via the adhesive layers 3 and
3'. A composite diaphragm is formed as shown in FIG. 1 which is laminated and bonded. After
that, the pin t / 2 is operated to move the press mold tb away from the press mold & a, and the
formed composite diaphragm is taken out. In the above-described embodiment, the urethane
sheet 2 with the metal foil 1 adhered to one side of the diaphragm base is contacted via the
adhesive layer 3 and heated and cooled to bond the urethane sheet 2 In the case of producing an
acoustic composite image moving plate having a configuration as shown in the figure, such a
urethane sheet 2 is not used, and metal foils are directly applied to both sides of the diaphragm
substrate 1 respectively. It goes without saying that the manufacturing method according to the
present invention can be applied also when manufacturing an acoustic composite diaphragm
formed by bonding. In such a case, the metal foil is brought into contact with the both sides of
the diaphragm substrate 1 through the adhesive layer, and this is heated and cooled to be
bonded. As described above, according to the present invention, in the heating step of heating
and melting the heat melting adhesive layer sandwiched between the metal foil to be adhered
and the sauce 4 / sheet or the diaphragm substrate, Since the metal foil itself can be directly
heated without heating the pressing die for holding the object to be adhered, and the adhesion
layer can be heated thereby, the heating efficiency for the adhesion layer is extremely good, and
therefore, compared to the prior art, The heating time can be significantly reduced, and energy
saving and energy cost reduction can be achieved. Furthermore, even in the cooling step for
bringing the molten adhesive layer into the non-molten state, the press die etc. around the object
to be cooled is not in the heated state, so the cooling efficiency for the adhesive layer is good,
compared to the prior art. Can significantly reduce the cooling time, save energy for cooling, and
reduce energy costs.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing an example of
an acoustic composite diaphragm, and FIG. 1A is an example of an electromagnetic induction
heating apparatus used for carrying out a method of manufacturing an acoustic composite
diaphragm according to the present invention. Fig. Λ is a plan view showing an example of the
main part of the device shown in Fig. A, Fig. 3 is a method of manufacturing an acoustic
composite diaphragm according to the present invention. It is process drawing for
demonstrating. In the figure, l is a diaphragm substrate, u is a urethane sheet, 3 and 3 'are
adhesive layers, da is a metal foil, a and b are press molds, 6a and 6b are work coils, 7 is a drive
circuit portion, a and gb are pressed plates, 9a and 9b are shown in FIG. In the figure, l is a
diaphragm substrate, u is a urethane sheet, 3 and 3 'are adhesive layers, da is a metal foil, and a
and b are press molds, and 6a and 6b are press plates. Work coil, 7 drive circuit section, gap a
and gb pressed plate, 9a and 9b 1st month of 30 corrections for EndPage: 4 1 No. 490 2, Name
of the invention Method of manufacturing an acoustic composite diaphragm 3, Relationship with
the case of correction Patent applicant Address Tokyo parts for Kita product for 4-chome No. 7
No. 33 name (2tg) Sony Corporation representative Kazuo Iwama 4, attorney Yubinbango150
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