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JPS5735498

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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 JPS5735498
Description t name of the invention
Speaker diaphragm
5. Detailed Description of the Invention The present invention uses a three-dimensional
reticulated porous metal as a core material. The present invention relates to a diaphragm of a
speaker in which a surface material such as metal or plastic is attached to the surface. The
loudspeaker's diaphragm needs to be lightweight in order to make the speaker's efficient □ '-and
the diaphragm itself has to be highly rigid so that it does not deform during vibration. がある。
Therefore, it is desirable that the diaphragm be made of a material having a low density and a
high modulus of elasticity. However, the only material with low density and high elasticity is only
special materials such as poron and beryllium. It can not be easily used as a speaker diaphragm.
Therefore, it has been attempted to obtain a diaphragm meeting the intended goal by combining
a plurality of materials of different materials conventionally to form a composite or devising the
structure. In order to improve the structure, there has conventionally been used a honeycomb
core as a core material, and a foil made of metal such as aluminum or titanium bonded to one
side or both sides of this core material to form a sandwich plate. The diaphragm of such a
structure is shown in FIG. In the diaphragm shown in FIG. 1, the core 1 has a honeycomb
structure. The surface material 2-1.2-2 such as aluminum and titanium is bonded to both sides of
the core material 1 with the sheet adhesive 5-1.degree. Also serves as. The core 1 is made of a
thin plate material in order to minimize the mass of the core t, so the contact portion between the
core 1 and the surface material 2-1.2-2EndPage: 1 is as shown in FIG. 2 a. As a result of line
contact, the contact area between the two is small. Therefore, when the core material 1 and the
surface material 2-1.2-2 are bonded with the adhesive 3-1.degree. 3-2, the adhesive 5-1.5-2 is
shown in FIG. 2 or FIG. 2C. It will be like that. In the state shown in FIG. 2, the adhesive 3-1.5-2 is
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attached to both sides of the core material 1 and the core material 1 is in contact with the 1
surface material 2-'' 1.2-2. The case of being slightly attached near the part is shown. In this case,
since the amount of adhesive used is small, the mass of the diaphragm does not increase so
much, but the adhesion area between the core material 1 and the surface material 2-1.2-2
narrows, so the amount of adhesive used Since there are few, 1 surface material 2- and 1.2-2 peel
easily from core material 1, and can not be used as a diaphragm. Also, in the state shown in FIG.
2C, the adhesive 5-1.5-2 is adhered to the entire surface of the surface material 2-1.2-2 and
further to both sides of the core line 1 Show the case. In this case, the adhesive 5-1.5-2 adheres
to the entire surface of the surface material 2-1-2-2 and the adhesion area of the 11 adhesive
increases, so the adhesion strength increases and the surface material 1-1. 2-2 also does not peel
easily.
However, due to the increase in the amount of adhesive used, the weight of the adhesive
increases the mass of the diaphragm, which reduces the efficiency of the speaker. Also, instead of
the honeycomb structure core material, a three-dimensional network porous metal having a large
number of continuous pores is used. A diaphragm in which a surface material is adhered to the
surface of this porous metal is proposed and misrepresented. Such a diaphragm is described, for
example, in JP-A-52-78425. The diaphragm described here has a surface layer made of a
synthetic resin adhered to the surface of a porous metal having a porosity of 90 to 98% by an
adhesive, and then is pressed into a predetermined shape. To obtain a diaphragm. The porous
metal used for the diaphragm can be obtained by the method described in, for example, JP-A-5417521. A porous metal has a large space with a porosity of 90 to 98, so when it is made of
aluminum etc. and used as a diaphragm, the diaphragm becomes lightweight and the rigidity is
also large, and a good diaphragm Is obtained. However, as shown in FIG. 3, the porous metal
having a high porosity is in the form of a five-dimensional network, and is composed of a large
number of skeletons 7 and holes 8 connected to each other. In the case of bonding at the end of
a large number of skeletons, to which the surface material is adhered, there is a disadvantage
that it can not be easily attached to Km. That is, in the surface of the porous metal 40 shown in
FIG. 3, as in the case of cutting the mesh, many skeletons 7 forming the mesh are cut, and the cut
portion is exposed, so this ftK surface material In the case of contact, the surface material and the
skeleton are in point contact, and even when an adhesive is simply applied and adhered,
sufficient adhesive strength can not be obtained. This is bonding under severe conditions with
less effective surface area than actual drawing and bonding of very fine wires between the
honeycomb core material and the surface material, and the necessary adhesive strength is
obtained with a small amount of light adhesive. Is hard to expect. Practically, as seen in the
example of the honeycomb core, a sheet-like adhesive, which is thicker than that used in the
honeycomb core, in other words, an adhesive having a large weight, is used. As described above,
the prior art may inhibit the weight reduction, which is a characteristic that the diaphragm
should not necessarily have. 1i! Along with the difficulty of wearing operation. The present
invention, except for the above-mentioned drawbacks in the prior art, has a sandwich-structured
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diaphragm in which a metal with a three-dimensional network structure and a surface material
are firmly bonded with a small amount of adhesive so as not to inhibit weight reduction. It is
what you get. Hereinafter, a diaphragm of a speaker according to the present invention will be
described with reference to an embodiment shown in the drawings.
FIG. 6 is a cross-sectional view showing an embodiment of the diaphragm according to the
present invention, and 4 is a three-dimensional network porous metal made of a light metal such
as aluminum. Reference numeral 11 denotes a surface material made of a metal foil such as
aluminum or the like attached to the porous metal 40 surface KII or a synthetic resin sheet, and
the surface material 11 is bonded to the porous metal 4 with a foaming adhesive 9. The
diaphragm is composed of the porous metal 4, the surface EndPage: 2 material 11 and the
foamable adhesive 9. The porous metal used herein is a porous metal prepared by the method
described in, for example, JP-A-54-17521, and one having a porosity of 90 to 98% is used. The
foamable adhesive 9 is foamed inside the pores 8 of the porous metal 4 and entangled around
the many skeletons 7 to increase the adhesive strength and reduce the amount of the adhesive 9
used in the diaphragm. It prevents the increase of mass. In order to obtain the diaphragm shown
in FIG. 6, an epoxy having good fluidity and wettability as an adhesive so that the adhesive 9 can
flow favorably into the pores 8 between the skeletons 70 of the porous metal 4 Choose
adhesives, phenolic adhesives, acrylic adhesives, etc. When the frame 7 is covered widely with
the adhesive 9, the weight increase occurs with the increase of the view, so that weight reduction
is provided by high magnification foaming of the adhesive for weight reduction. Then, the
adhesive 9 is applied onto the metal foil or plastic tag sheet of the surface material 11. Although
application may be either spray method or brush coating. It is coated with uniform thickness on
each part of the surface material. こnは。 The amount of adhesive applied is in line with the
foaming ratio of 11 adhesives. The adhesive 9 determines the coverage area of the frame 7 and
at the same time determines the local area density (weight per unit area: t, / at) as a sandwich
structure. The application amount of the adhesive 9 can be appropriately determined in
consideration of the expansion ratio of the applied film. The temperature with which the metal
foil with an adhesive coated film thus formed is pressed against the porous metal 4 so that the
adhesive coated surface is in contact with the porous metal 4 and this is broken by the adhesive
9 And heat it for a while. Then, the adhesive 9 foams in the pores 8 of the porous metal 4 to
increase its volume. At this time, all the expansion of the adhesive 9 proceeds toward the pores 8
of the porous metal 4 to cover the skeleton 7. This situation is shown in FIG. FIG. 4 α is a plan
view showing the surface of the porous metal in an enlarged manner, in which frameworks 7
having a triangular cross section are dotted at intervals. Then, when the adhesive flowing into the
space between the frames 70 is heated, the adhesive 9 foams and covers the area around the
frame 70 as shown in FIG.
And increase the surface area of the porous metal. The adhesion strength between the porous
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metal and the surface material of the plate having a sand-chichi structure obtained is 111 / width
10-or more in the 180 ° peeling test, and fracture occurs at the interface between the adhesive
and the surface material. ing. It holds sufficient adhesive strength as a diaphragm. The
indentation K of the foamed adhesive into the pores of the porous metal increases the damping
characteristics as the diaphragm and helps to reduce the sharpness at the one-division resonance
point. Incidentally, the foamable adhesive as referred to in the present invention is epoxy or
tunol. Thermosetting resins such as polyurethane to which a curing agent, curing aid, catalyst
and the like are added, thermoplastic resins such as polyethylene, polyvinyl chloride, polyamide,
polyvinyl acetate, ethylene-vinyl acetate copolymer, and natural rubber, Nitrile rubber,
chloroprene rubber, etc. K. As a blowing agent, for example, azodicarbonamide. A mixture of one
or two of azobisisobutyronitrile, dinitrosopentamethylenetetramine,
paratoluenesulfonylhydrazide, 4. 4 'oxybisbenzenesulfonylhydrazide, etc. is added to the mixing
roll below the decomposition temperature of the foaming agent, Alternatively, they are mixed in a
kneader, and the mixture is molded into a sheet, a rod 1 granular body, and a mixture obtained
by dissolving or dispersing the above mixture in a solvent to form a paint. In addition, the abovedescribed foamable adhesive is expanded by foaming, and the apparent volume is doubled to 50
times, and the bulk density is reduced accordingly. Hereinafter, a specific manufacturing method
of the diaphragm of the present invention will be described. In the embodiment, epoxy resin 3
which contributes to adhesion increase 1 elastic modulus improvement and toughness
improvement, in this case Epicor) 4828.60 parts by weight, Epicoat A1002 and 10 parts by
weight of thermoplastic epoxy resin (union carbide = PKHH) The mixture is heated at a
temperature of 180 ° C. to melt and mix. The mixture is then cooled to room temperature to
form a mass. EndPage: 3 Subsequently, 6 parts by weight of a curing agent dicyandiamide and 5
parts by weight of a foaming agent azobisisobutyronitrile are further added to 100 parts by
weight of the above-obtained mass. The resultant was heated and pressed under the conditions of
temperature 90 v and pressure 5 o 47-to obtain a foamable adhesive film having a thickness of
50 μm. Next, the operation situation after chewing is shown in FIG. That is, aluminum porous
metal 4 (thickness 6 厚, porosity 98%, tensile strength αc + sr; o / wl) by casting method is used
as the core material and aluminum foil (JISH 4160) is used as the surface material 11 And the
foamable adhesive sheet 10 obtained above is interposed.
Next, a compressive force 12 equal to or less than the buckling load of the porous metal 40 is
applied from the surface material 11 @ and heated at a temperature of 150 v to 170 v and held
for 50 minutes. During this time, 1 foamable adhesive 10 foams and expands 1 and enters pore 8
of porous metal 4, and as shown in FIGS. 4 and 6, frame 7 is enclosed and pore 8 is further filled.
The porous metal core 4 and the surface material 11 are firmly bonded, and the expansion ratio
of the foamable adhesive obtained above is about-fold, and the bonding strength between the
porous metal and the surface material is 180 °. The tear was 2.5 * / @ 25 @. また。 Bulk
density of plate according to this configuration (Pi is 0.1 t / d, elastic modulus (E) t!
115X1011dyne/4. The specific elastic modulus CE'ip) determined from this was 5
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× 10 7 / zgc 2. EXAMPLE 2 Instead of Epikot t-7f, 82B used in Example 1, a nitrile rubber (Hiker
('TEN')) was used, and the other compounding amounts and blending amounts were the same,
and the catalyst triphenylphosphine was used as such. 0.2 parts by weight was added and the
mixture was stirred and mixed in the same manner as in Example 1 at a temperature of 150C for
4 hours, and further cooled to a constant temperature to obtain a thermosetting resin lump.
Subsequently, 6 parts by weight of a curing agent dicyandiamide 0 parts by weight 8 parts by
weight of a foaming agent azodicarbonamide is added to 100 parts by weight of the lump
obtained above, and this mixture is a sheet at a die temperature of 80'c or less of the extruder. It
shape | molded in the shape and obtained the foamable adhesive film of thickness 5opWL.
Subsequently, the porous metal core material and the aluminum foil surface material were
adhered in the same manner as in Example 1. The expansion ratio of the foamable adhesive
obtained above is about 5 times, and the adhesion strength between the porous metal core
material and the aluminum foil surface material by 1807 peeling is 121 f // l! It was 25 ships. In
addition, the bulk density t ′ ′ of the plate according to this configuration !, 0.095 # / d, elastic
modulus)! 0.45X’lO”d3’1M/j。 The specific modulus was 4.74 × 10 ′ ′ d /
1402. Example 5 100 parts by weight of a composition obtained by adding a curing agent and a
foaming agent to the main material obtained in Example t was dispersed and suspended in 100
parts by weight of methyl ethyl ketone, and this was sprayed on the aluminum foil used in
Example 1. It apply | coated and air-dried for 20 minutes in a 110 degreeC hot air flow. The
thickness of the film of the foamable adhesive formed on the surface of the aluminum foil was 65
μm. With the foamable adhesive film-coated aluminum foil obtained above as a surface material,
porous metal was used as a core material in the same method and conditions as in Example t. The
foaming ratio of the adhesive was easy, and 18 (the adhesion strength by 10 peeling K was 2 'f /
@ 2 sw.
Moreover, the characteristic value of the board by this structure was equivalent to the goods of
the Example. Example 4 100% by weight of a composition obtained by adding a curing agent and
a foaming agent to the main material obtained in Example 2 is dispersed and suspended in 80
parts by weight of acetone, and this is spray-coated on the aluminum foil used in Example t. It
was air dried for 20 minutes in a hot air stream of 110 ° C. The thickness of the coating of the
foamable adhesive formed on the aluminum foil surface was 40 μm. Using the foamable
adhesive film-coated aluminum foil obtained above as a surface material, both were bonded using
a porous metal as a core material in the same manner and conditions as in Example t. The
expansion ratio of the adhesive was 5.2 times, the adhesive strength by 180 'peel K was 2.51 f /
width 25-. また。 The characteristic values of the plate having this configuration were equivalent
to those of the second embodiment. Specific embodiments have been described above. In
addition, thermoplastic resins such as polyethylene and polyamide can be used instead of the
epoxy resin used in Examples 1 to 4. In this case, the decomposition temperature of the foaming
agent is preferably equivalent to the heat softening temperature of each resin, or the temperature
of EndPage: 4 or more. With regard to the properties of the foamable adhesive, those using a
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thermosetting resin have a higher service temperature <9 and greater adhesion than those using
thermoplastic resins. In addition, since foamable adhesives made of thermosetting resin are
flexible. Proper use is important. As described above, the diaphragm of the speaker according to
the present invention has a small area for mounting IIi, and the five-dimensional mesh-like
porous metal and metal foil or plastic sheet with the bonding portion formed in a pointed shape
of the wire. Since the vibration plate is lightened by bonding with the adhesive, it is possible to
obtain sufficient bonding strength with a small weight / volume ratio adhesive of the surface
material. I was old. Since the adhesive fills the pores of the core material, it is also effective in
reducing the sharpness generated at the divided resonance point of the diaphragm.
4. Brief description of the drawings FIG. 1 is a perspective view of a diaphragm in which a
conventional honeycomb core material and a surface material are joined by a sheet-like adhesive.
FIG. 2151I is a cross-sectional view of the joint portion between the honeycomb core material
and the surface material shown in FIG. 1, FIG. 3 is an example of a three-dimensional network
porous metal, and FIG. FIG. 5 is an exploded view of the diaphragm of the present invention, and
FIG. 6 is a cross-sectional view of the diaphragm of the present invention. 4I porous metal, 7I
framework, 8z holes, 111 surface material. Attorney Attorney Attorneys 1) Toshiyuki EndPage: 5
o 3 Figure Doo (υ) (1) 5 Figure 2 o 6 Figure 1 End Page: 6
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