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JPS5848598

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DESCRIPTION JPS5848598
[0001]
The present invention relates to a molding apparatus for a speaker diaphragm having different
surface thicknesses of an edge portion and a cone portion. In general, as a speaker diaphragm, as
shown in FIG. 1, the surface thickness of the cone 1 and the edge 2 are different. That is, the
surface thickness of the edge portion 2 is made sufficiently thinner than the surface thickness of
the cone portion 1 to increase the compliance, and the cone portion 1 can be sufficiently
oscillated. Conventionally, a molding apparatus for such a speaker diaphragm has been
configured as shown in FIG. 2. In the lower mold 6 having a frusto-conical recess 3 and a waveshaped portion 4 at the periphery of the recess 3, a frusto-conical protrusion 6 and the periphery
of the protrusion 60 A sheet composed of an upper mold 8 having a corrugated portion 7 and
having different surface thicknesses of the edge 2 and the cone 1 on the lower mold 6? After
placing, the mold 8 is lowered and molded into a predetermined shape. In this case, since the
truncated cone-like convex portions of the upper mold 8 hit the cone 1, they are formed first, and
the corrugated portion 7 of the upper mold 8 is not deformed at the thin edge portion 2. Become.
That is, only the gap H between the thickness finishing mold 8 of the cone portion 2 and the
lower mold 6 is opened. From such a thing, it was easy to generate | occur | produce the molding
defect of the edge part 2, and it was a thing which can not obtain the stable diaphragm for
speakers. The present invention is intended to eliminate the above-mentioned conventional
defects, to obtain a stable speaker diaphragm without occurrence of molding defects, and an
object thereof is to provide a speaker diaphragm molding apparatus. It is. In order to achieve the
above object, according to the present invention, an elastic body is provided at a portion
corresponding to the edge portion of the upper mold, and the elastic body first strikes the edge
portion, and the edge portion is molded. The present invention relates to a speaker diaphragm
molding apparatus in which a cone portion is molded. Hereinafter, the embodiment of the
present invention will be described with reference to FIG. A lower mold 9 has an inverted
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truncated cone-like recess 10 at the center of the upper surface, and a wave-shaped portion 11 is
formed at the periphery of the recess 1 o. In contrast to the lower mold 9, the upper mold 12 has
an inverted frusto-conical convex portion 13 at the center of the lower surface, and a silicon
rubber or urethane having a corrugated portion 14 at the peripheral portion of the convex
portion -13. An elastic body 16 such as a rubber system is connected. With such a configuration,
when the sheet having a thin edge portion 2 and a thick cone portion 1 is set on the lower mold
9 and the upper mold 12 is lowered, the elastic body 16 of the metal mold 12 contacts the edge
2 At first, the edge portion 2 is formed into a wave shape. Thereafter, the cone portion 1 is
molded by lowering the upper mold 12.
As described above, since the speaker diaphragm molding device of the present invention is
configured, a stable speaker diaphragm that can be reliably molded regardless of how different
the surface thickness of the cone portion and the edge portion is. The product yield is high and
the dog is of industrial value.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a cross-sectional view of a general loudspeaker diaphragm, FIG. 2 is a cross-sectional
view of a conventional loudspeaker diaphragm molding apparatus, and FIG. 3 shows one
embodiment of the loudspeaker diaphragm molding apparatus of the present invention. FIG.
9 ...... under mold, 1o ...... inverted truncated cone-shaped recess, 11 ...... wave shaped portion, 12
... ... upper mold, 13 ... ... Inverted truncated cone-like convex part 14, ... ... wave-shaped part, 16 ...
... elastic body.
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