JPS5358223

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DESCRIPTION JPS5358223
Description 1, title of the invention
Speaker diaphragm
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a speaker
diaphragm. The porosity of the spongy metal is 60 to 98%, and the holes penetrate from one side
to the other side in a tunnel-like manner, and the resistance between the holes is small, which
hinders the penetration of air. It can not be used as a diaphragm until it reaches t. In general, a
method of bonding plus or minus metal foil to a sponge-like metal surface with an adhesive has
been employed in order to knead air circulation. In this case, it is necessary to individually form
and bond the metal plate and the sponge-like metal that close the pores of the sponge-like metal,
there are many manufacturing steps, and the equivalent mass of the diaphragm fluctuates due to
the variation of the adhesive amount. It was a major cause of Also, there is a speaker diaphragm
in which a thermoplastic synthetic resin (hereinafter referred to as plastidac) foaming agent such
as polyurethane, polystyrene or polyethylene is interposed between an adhesive and two
conventional metal diaphragms. The lamp, two metal diaphragms and a synthetic resin foam
were individually molded and bonded. Therefore, it has been mentioned previously that there are
many manufacturing processes and that the amount of adhesive used varies and the diaphragm
mass fluctuates. Therefore, it is conceivable that if the heat adhesion type film adhesive is used
for the adhesive of the conventional adhesive, the variation in the amount of adhesive EndPage: 1
decreases, but the above-mentioned plastic foam material has a low heat resistance temperature
In addition, it is difficult to control the temperature of each part with high accuracy, and there
are difficulties in handling the operation. Heat-welding type layered adhesive can not be used for
heat resistance 0 The purpose of the present invention is to reduce the number of manufacturing
steps, which is a drawback of the above-mentioned prior art, and further to reduce the number of
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equal masses of diaphragm To reduce the fluctuation and to provide a high performance
diaphragm. The present invention is characterized in that a heat-welding type layered adhesive is
sandwiched between a metal plate and a sponge-like metal, and is thermally formed into a
diaphragm shape and at the same time the metal plate and the sponge-like metal are bonded to
obtain a speaker diaphragm. It is a thing. Hereinafter, embodiments of the present invention will
be described with reference to the drawings. FIG. 1 shows a structure prior to line forming,
wherein the metal plate 1, the heat welding type layering adhesive 2, and the metal foam 3 are
respectively overlapped in a flat plate of a predetermined shape. The second mold is formed by
adding and molding the structure of FIG. 1 in one step. However, the opening for the voice coil
bobbin is cut and provided at the central portion after molding. FIG. 3 shows another
embodiment of the present invention in which a sponge-like metal 3 is sandwiched between two
metal plates 1 with a heat-welding type membrane adhesive 2 interposed therebetween.
Further, in FIG. 3, a cylindrical portion having a predetermined size is provided at the central
portion of the diaphragm. FIG. 4 shows the sponge-like metal 3 adhered to the periphery of the
opening in the central portion of the diaphragm to increase the mechanical strength of the
peripheral portion of the diaphragm opening. In FIG. 5, the sponge-like metal 3 is adhered to the
outer edge of the diaphragm to increase the mechanical strength of the outer edge of the
diaphragm. Fig. 1 further shows a dome according to the present invention. In the example
applied to the mold diaphragm, of the sponge-like metal 3. Also use the sound absorption effect
to damp air resonance in the dome. effective. Thus, according to the invention, a heat-welded
membrane-like. Since an adhesive is used, when forming a sponge-like metal into a diaphragm
shape, if a metal plate, a heat-welding type membrane-like adhesive, and a sponge-like metal are
laminated and heat-formed, the loudspeaker imaging of the structure of the present invention
The plate can be obtained by molding in one step, and the effect of reducing the number of
manufacturing steps is large. In addition, it is possible to reduce the fluctuation of the evaluation
mass of the diaphragm due to the dispersion of the adhesive amount. FIG. 3 shows an
embodiment in which a sponge-like metal is sandwiched between two metal plates via a heatwelding type membrane adhesive, and one metal plate and five heats are applied even if it is not
formed in one step. Even if a welding type film adhesive and a sponge-like metal are overlapped
and simultaneously formed, and heat bonding is performed using a single metal plate separately
formed, the effect of the present invention in which the number of manufacturing steps is
reduced compared to the conventional is not lost It is clear. Further, in the embodiment shown in
FIG. 5, since it has a sandwich structure in which a sponge-like metal is sandwiched between two
metal plates, intra-column vibrational resonance in the circumferential direction which is the
effect of the diaphragm of the conventional sandwich structure. It goes without saying that it
naturally has an effect such as being strong to (usually called as resonance). In the embodiment
of FIG. 4, the effect of the present invention is further developed by reducing the weight of the
sponge metal to be used, which is also effective for so-called resonance. In addition to the effects
of the present invention, the embodiment of FIG. 6 also has the effect of damping air resonance
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in the dome. Although the metal plate is visible on the surface side in the embodiments of FIGS. 1
to 5, the present invention is applicable even if the metal plate is on the back side (voice-bottle
bobbin 111) by reversing the positional relationship between the metal plate and the sponge-like
metal. It does not lose to the effect of the invention.
4, a simple explanatory view of the drawings show the speaker diaphragm according to the
present invention, respectively, FIG. 1 is a structural sectional view showing a state before
molding, FIG. 2 is a structural sectional view showing a state after molding, FIG. 3 is a structural
sectional view showing another embodiment of the present invention, and FIG. 4 and FIG. 5 are
structural sectional views showing a part of the embodiment according to the present invention,
and FIG. FIG. 7 is a cross-sectional view of a dome-shaped diaphragm applied to the structure.
EndPage: 21: Metal plate 2: Heat welding type film adhesive 3: Sponge metal! Agent Patent
attorney Utsuda: Toshiyuki. Likely 1 figure 2 figure 3 λ3 roy 4 figure 5 囚; +6 day EndPage: 3
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