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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
improvement of a speaker diaphragm and a method of manufacturing the same. [Technical
background of the invention and its problems] As is well known, paper has been mainly used as a
speaker diaphragm conventionally, but other materials such as metals such as aluminum and
titanium, bakelite, polypropylene and the like In some cases, a synthetic resin is used. Since these
materials have low bending stiffness, they can be used as conventional cone diaphragms and
dome diaphragms, but are unsuitable as diaphragms of flat loudspeakers in the near future. That
is, the material of the flat loudspeaker diaphragm is required to have a large flexural rigidity, and
for this purpose, it is required to be a material having a small density so as to obtain a sufficient
thickness. FIG. 1 shows a conventional flat loudspeaker diaphragm which is realized in
consideration of the above points. Just because this has insufficient properties with the existing
single material, the skin material 12.13 of high elastic modulus is bonded to both sides of the
base material 11 made of honeycomb or foam. It is made into a composite by bonding through Is
"k. However, in the case of a loudspeaker diaphragm made of such a composite material, a large
amount of adhesive is required to obtain sufficient strength on its adhesive surface, so the
material's performance of seven hundred percent in terms of density and elastic modulus It was
difficult to retrieve. SUMMARY OF THE INVENTION Therefore, the present invention has been
made in view of the above points, and it is possible to obtain sufficient adhesive strength with a
small amount of adhesive as much as possible. It is an object of the present invention to provide
a very good speaker diaphragm which is light and rigid and a method of manufacturing the same.
[Summary of the Invention] That is, the speaker diaphragm according to the present invention is
a substrate made of a hard rubber foam and one adhered to both sides of this substrate, and is a
mica laminate or a composite material mainly made of mica And a non-woven fabric interposed
between each surface of the base material and the adhesive surface of the skin material. Further,
in the method of manufacturing the speaker diaphragm according to the present invention, at the
time of molding of the base material made of hard rubber foam, the both sides of the base
material are interspersed with non-woven fabric skin materials consisting mainly of mica
laminates or composites composed mainly of mica. It is characterized by being made to adhere at
the present invention will be described in detail with reference to the drawings. That is, in FIG. 2,
21 is a base material made of a hard rubber foam, and in a state in which non-woven fabrics
22.23 are respectively contained in an adhesive 24.25 on both sides of this base material 2a, a
mica laminate Alternatively, a skin material 26 ° 27 made of a composite material based on
mica is adhered.
Here, each material used in the speaker vibration configured as described above will be
described. 1 Hard rubber foam which is suitable for sulfur, an organic foaming agent and an
auxiliary agent for an ebonitizable natural rubber or a synthetic rubber It can be obtained by
subjecting the rubber composition blended to-to a treatment as described below. ■ Skin material
It is impregnated with epoxy resin or unsaturated I polyester resin in a mixture of mica laminate
and mica and noelso, or mica and aromatic polyamide, or mica and potassium titanate single
crystal fiber. Obtained by curing. (3) Non-woven fabric This is made of carbon fiber or non-woven
fabric of glass fiber or aromatic polyamide. Adhesive: A two-component epoxy resin varnish is
used. Fig. 3 (孕)-(d) show the manufacturing process of the speaker diaphragm using each
material as described above. (A) The above-mentioned rubber composition (1) is placed in a
primary mold 31.32 of the product thickness% to be pressed by a heat plate 33 ° 34 and
subjected to heat i. (B) A blow-molded product (1) of the rubber composition (1) obtained by the
preliminary molding of (a) is foamed to be rubber sponge-like. (C) The skin material 1 and the
non-woven fabric 2 are piled up and become an adhesive agent 2. The Nibxi varnish
impregnation device 35 (= applied and then heated by the dryer 36 becomes a skin composite
material 2). (D) 1 blow molded product of (b) and skin composite material of (e) are laminated as
shown in the drawing and placed in a secondary mold 37. 38, and then over a hot plate 39. 40 'f
7 The heat treatment is performed at about 180 to 200 ° C. while pressing. At this time, the
epoxy resin impregnated in the skin composite material works as an adhesive, and the nonwoven fabric facilitates the passage of gas generated when the rubber composition of the blow
molded product foams, and thus the adhesive surface It serves to prevent air bubbles from
remaining in the In addition, the skin material 1 and the blow-molded product 1 of the rubber
composition 1 are firmly adhered by the internal pressure of the rubber composition 2 that
foams. Then, the adhesive agent is completely cured. In this case, is the epoxy resin in a state
where the non-woven fabric is interposed between the skin material and the foamed rubber
composition? Since the matrix is a so-called reinforced plastic, as a result, the skin materials 26
and 272 are firmly and uniformly bonded to both sides of the base 21 of FIG. 2 with a small
amount of adhesive as much as possible. Is possible. Furthermore, since the molding process of
the foam and the adhesion Z with the skin material can be performed at one time as a
manufacturing process, it has an advantage of shortening the process.
Then, as described above (the speaker diaphragm t obtained in a rigid manner, the density can be
reduced to 2 as compared with that of the conventional one, and the specific elastic modulus is
improved to be twice or more. Therefore, according to the present invention, as described in
detail above, sufficient adhesive strength can be obtained with as little adhesive as possible, so
that it is as light and rigid as possible. : It becomes possible to provide a rich and extremely good
speaker diaphragm and a method of manufacturing the same. The present invention is not
limited to the above-described and illustrated embodiments, and it goes without saying that
various modifications and applications are possible without departing from the scope of the
present invention.
Brief description of the drawings
1 is a sectional view showing a conventional speaker diaphragm Z, FIG. 2 is a sectional view
showing one embodiment Z of a loudspeaker diaphragm according to the present invention, and
FIG. 3 (111 to (d) is a manufacturing process of FIG. FIG.
21 ... base material, ■, 22.23 ... non-woven fabric, ■ ■. 24.25 ··· Adhesive ·, 26.27 · · · Skin
material, ■ Rubber composition, 31.32 · · · Primary mold, 33.34 · · · Hot plate, ■ Primary
molding , 35: epoxy varnish impregnation device, 36: dryer, ..: skin composite, 37.38: secondary
mold, 39 ° 40: hot plate.