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Description 1, title of the invention
Method of manufacturing speaker diaphragm
3. Detailed Description of the Invention The present invention relates to a method of
manufacturing a cone-shaped speaker diaphragm, and it is an object of the present invention to
improve the elastic modulus of the root of a cone and to increase the high frequency limit of the
speaker. In the cone-shaped speaker diaphragm, when the elastic modulus at the base of the cone
is improved, the high frequency limit of the speaker using this diaphragm becomes high, and the
reproducible band is expanded. Heretofore, the strength has been enhanced by impregnating the
base portion of the cone (made of a thermoplastic resin or a thermosetting resin. However, the
above-mentioned conventional manufacturing method requires a resin impregnating step in
addition to the sheet making step and the forming step, and the manufacturing step is many and
complicated. The present invention eliminates the above-mentioned conventional drawbacks, and
an embodiment of the present invention will be described below. A composite sheet (100 q / m 2
basis weight) is prepared by mixing high density polyethylene synthetic 7 "(85 wt%) and carbon
fiber (15 wt%). After this composite sheet is preheated at 180 "C, it is cold pressed using the
mold shown in Fig. 1. If the composite sheet softened by the preheating is formed into a cone
shape by cold press At the same time, the elastic modulus of the root increases by EndPage: 1.
FIG. 1 shows a cross section of the lower mold used in the manufacturing method of the present
invention. The lower die 10 has a diameter of 10 and a press surface on the upper surface has a
cone shape. Reference numeral 2 denotes a hole formed at the center of the lower mold 1. In the
hole 2, a movable mold 3 is supported so as to be vertically slidable. A spring 4 biases the
movable mold 3 in the press surface direction. The movable mold 3 is a lower mold
corresponding to the base of a cone-shaped diaphragm, and as shown in FIG. . In FIG. 1, the
preheated composite sheet is fed above the lower mold, and the upper mold 5 is lowered from
the upper portion of the composite sheet, as shown in FIG. The composite sheet 6 is held by the
lower mold 1 and the movable mold 3 to be formed into a cone shape (press pressure 10 / c4),
and a portion of the composite sheet 6 which abuts on the movable mold 3 at the time of
pressing. That is, the pressing pressure at the root increases, and the elastic modulus of the root
increases. As described above, after forming a part of the composite sheet 6 in a cone shape, the
outer portion of the cone portion is cut, and the central flat portion of the root portion is cut off
to complete the diaphragm. The coil bobbin is fixed to a hole formed at the center of the
The elastic modulus of the base of the diaphragm in the above embodiment was 3.7 О 10 10
dyn / c ?, and the elastic modulus of the other portion was 3 ░ OX 10 10 dyn / c ?. The
present invention is not limited to the above embodiment, and can be used when manufacturing
a diaphragm made of a fiber assembly. Examples of the fiber assembly include paper made of a
fiber aggregate and a cocoon, natural or pulp, a fiber assembly made of a thermoplastic resin,
and a mixture of a fiber assembly made of t- or a thermoplastic resin and an inorganic fiber. The
thermoplastic resin fibers are fibers of polyethylene, polypropylene, nylon, polyester and the like.
The inorganic fibers are carbon fibers, glass fibers and the like. The present invention, as
described above, increases the pressing pressure at the root portion during press molding to
improve the elastic modulus of the root portion, and without increasing the number of steps, the
elastic modulus of the root portion simultaneously with press molding It has the advantage of
being improved.
4. Brief description of the drawings FIG. 1 is a cross-sectional view of a lower mold used in a
method of manufacturing a speaker diaphragm in an embodiment of the present invention, and
FIG. 2 is a press forming of the manufacturing method in an embodiment of the present
invention. FIG. 1 ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии Upper ...
Composite sheet. Name of agent Attorney Nakao and others 1 person Figure 1 Figure 2 EndPage:
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