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! 'J' 1i Wf & 数 number of inventions 3, inventor 34 WiF storage r * & 'l & f-chome 6 number 1No. Patent applicant 34 Ka l! No. 114 (6), No. 5 (1) Item 11 (2) Drawing 1-0 Japan Patent Office
■ JP-A-51-132260 (1976) 2.2 L Japanese Patent Application No. 4-7- '? 4 and in the agency
serial number t / 1. i, t, s, tO specification is the title of the invention
Loudspeaker diaphragms are mixed and finished with a paper loudspeaker diaphragm.
3. Detailed Description of the Invention The present invention is a diaphragm for loudspeakers
which is finished by mixing paper and pulp fibers with Sdenless steel fibers which are completely
different in raw materials, manufacturing method and properties from fibers used in
conventional diaphragms for loudspeakers. And the eL '/ l diaphragm plate which imparts
excellent acoustic radiation and characteristics to the loudspeaker. As conventional fibers to be
mixed with paper and pulp fibers and finished as a loudspeaker or diaphragm, glass fibers, caporef fibers (or acrylic resin) or carbon fibers made of synthetic resin + 171, etc. There is. In
addition, the mixed materials mentioned above all have the following drawbacks when they are
molded with the diaphragm for the loudspeaker, respectively. First of all, although glass fiber has
the advantage of being easy to obtain, it has a large specific gravity as a material, so when it is
finished in a diaphragm it increases its weight and reduces the acoustic radiation efficiency of the
loudspeaker. It has a drawback. In addition, since kapok fibers are feathery in nature and contain
a large amount of air in L which is difficult to obtain, they are not compatible with water, float on
the making water and do not mix with the paper fibers. Then, when it is made up, only the layer
of lump of kapok fiber is loaded on the layer of paper fiber and fiber, and there is no bonding
force with the paper fiber layer either. The fiber layer is in a very easy to peel state. Therefore, a
diaphragm of such a composition may be separated from the interface between the two fiber
layers in a very short time by repeating complicated and intense vibrations when incorporated
into a loudspeaker, and it may not be useful. . Furthermore, carpon fiber made from synthetic
resin such as acrylic resin, leucine, etc., has its own characteristic properties and, because it is
processed at a high temperature of 2000 ° C. or more, it is completely graphitized or not. So,
activation is not good. Therefore, when such fibers are mixed in the making water, the
hydrophilicity is poor and the adhesion of the fibers themselves is poor. Therefore, a surface
treatment for imparting adhesion is essential as an EndPage: 1 addition step. It has a drawback,
and even if it is subjected to additional surface treatment, it is not desirable to be able to adhere
to the nature-quality soil. In addition, since synthetic resin fibers such as acrylic materials are
extruded from molten material at high temperature, the outer shape of the fibers are mixed with
paper fibers in a single fiber with no unevenness on the surface, like glass fibers. The bonding
strength between the two fibers is extremely weak. For the reasons above, the diaphragm made
of mixed acrylic raw carbon fiber only maintains apparent hardness due to the high Young's
modulus (xs, ooo Kp / mj) of acrylic carbon fiber itself, and it takes a long time When applied to a
loudspeaker diaphragm that should withstand intense vibration and emit high-fidelity radiation
to the electrical input, the bond between the paper pulp fiber and the acrylic carbon fiber is very
easily released, and the stiffness of the diaphragm is Because it can not be held, the radiation
sound quality may deteriorate in a short period of time.
The loudspeaker diaphragm of the present invention will be described with reference to one
embodiment thereof. That is, the present invention is a diaphragm for a loudspeaker, which is
made of stainless steel (sue steel fiber cut into a suitable length, mixed with pure pulp fiber in a
water, and thoroughly stirred, and then made up through a forming net. . The stainless steel fiber
as described above has a Young's modulus of 19.000 Kf /-and has a high intertwining strength
with paper fibers, so a diaphragm with high rigidity is obtained. As a method of manufacturing
stainless steel fibers, a die method in which the wire diameter is successively reduced by cold
drawing using a die in which cemented carbide or diamond is embedded is often used. Therefore,
according to the bundling method in which many pieces are bundled with copper sheaths and
converged to facilitate die drawing, the cross-sectional shape of the stainless steel fiber is not
round but irregular. It has a polygonal shape. Also, stainless steel fibers are uniformly and
uniformly dispersed in the make-up water, mix well with the paper fibers, and due to the
irregular cross-sectional shape, cause the paper fibers to curve, twist, and engage in the whisker
shape '. Since it is easy to become entangled, the paper fiber made up is combined with the effect
of the deposition binder of stainless steel fiber to make it coarse and form a bulky and rigid
diaphragm. A loudspeaker which can reproduce the sound sequence with little leeway with good
radiation efficiency can be obtained, and since the nature is stable, permanently good
characteristics can be maintained. -In addition, stainless steel fibers have excellent properties as
diaphragms for flame-retardant loudspeakers by incorporating them into diaphragms, and they
have excellent characteristics of the number of glass fibers as the other mixed fibers. Have. As
described above, the present invention is a diaphragm for loudspeakers which is finished by
mixing pure fibers and stainless steel fibers, and is finished with high rigidity, rough density,
bulkiness and flame resistance. It is an excellent diaphragm held by
3, a simple illustration of the drawing shows the cross-sectional shape of stainless steel fiber.
XE、DoOEndPage: 2