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JPS5657395

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DESCRIPTION JPS5657395
Description 1, title of the invention
Speaker diaphragm and method of manufacturing the same
3. Detailed Description of the Invention The present invention provides a diaphragm for a
speaker of a loudspeaker, in which a cone having a large specific elastic modulus and rigidity and
an edge having a large internal loss are integrally formed, and a method of manufacturing the
same. It is a thing. In the speaker diaphragm, it is preferable that the cone portion have a high
specific elastic modulus and high bending rigidity that can be produced, and the edge portion
have a high internal loss. In the conventional fixed type speaker diaphragm, there is nothing to
dry that satisfies the conditions of the cone portion and the edge portion, and the cone portion
and the edge portion are made of different materials, and the cone portion and the edge portion
Were bonded to make a diaphragm (free-edge type diaphragm). In the conventional fixed
diaphragm type speaker diaphragm made of paper, in the paper making process, the cone
portion and the edge portion are separated and the edge portion is formed sparsely. However, in
the conventional speaker diaphragm which is divided into EndPage: 1 in the sheet making
process as described above. While not being able to fully satisfy each physical property of the
said cone part and an edge part, since it separates in a sheet-making process, it takes time for
sheet-making, and it was difficult to manufacture many diaphragms for speakers at once. The
present invention eliminates the above-mentioned disadvantages of the prior art. An embodiment
of the present invention will be described below. EXAMPLE 1 High density polyethylene staple
fiber with a fiber length of about 0.6. 15 wt. Of carbon fibers with a fiber length of 6 and a fiber
diameter of 12 μ are mixed and formed into a sheet to produce a composite sheet (weighing
100 y / 靜). In FIG. 1, 1 is the above composite sheet. In this composite sort, high density
polyethylene short fibers and carbon fibers are intertwined. The composite sheet 1 is introduced
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into the water tank 3 through the roll 2 as shown in FIG. 1 as a child, and the composite sheet 1
is immersed in water to soften the composite sheet 1. The composite sheet 1 is pressed by a
press to form a diaphragm. In FIG. 1, 4 is an upper mold, 5 is a lower mold, and the upper mold 4
is a cone mold 6. A cylindrical edge portion mold 8 fixed to the outer peripheral portion of the
cone portion mold 6 via a heat insulating material 7 has a heater 9.10 built in the cone portion
mold 6 and the edge portion mold 8. It is done. The reference numeral 11 denotes a pipe formed
in the edge mold 8 and cooling water is circulated in the pipe 11. Reference numeral 12 denotes
a pipe for cooling water circulation formed in the lower mold 6. In FIG. 1, the composite sheet 1
immersed in the water tank 3 is held for several seconds between the upper mold 4 and the
lower mold 5, the cone is heated to 180 ° C. to 20 ° C., and the edge 70 ′ ′. It is heated to C80 ° C.
The corn portion is heated at a temperature higher than the melting point (137 ° C.) of the high
density polyethylene short fibers, so that the molten high density polyethylene is in a state in
which carbon fibers are mixed, and solidifies in this state. On the other hand, since the edge
portion is heated below the melting point of the high density polyethylene short fiber, the high
density polyethylene short fiber softens but does not melt, and the polyethylene short fiber and
the carbon fiber are in a entangled state. Table 1 shows the physical properties of the cone and
the edge of Example 1 above. Table 1 [Example 2] The same composite body 1 as in Example 1
was formed into a diaphragm shape by pressing with a press shown in FIG. In the actual case, the
temperature of the edge mold 8 is 125 ° C. to 135 ° C., and the temperature of the cone mold
6 is 180′′C to 200′′C. Table 2 shows the physical properties of the cone portion and the
etched portion of the diaphragm of Example 2. Although high-density polyethylene staple fibers
are used as thermoplastic synthetic fibers in all of the above-mentioned embodiments,
thermoplastic synthetic fibers such as polypropylene fibers and acrylonitrile fibers may also be
used. In addition to carbon fibers, glass fibers, silicon fibers, aromatic polyamide fibers and the
like may be used as fibers of high elastic modulus mixed into high density polyethylene fibers.
The present invention is configured as described above, and 1 according to the present invention,
a cone portion having a large specific elastic modulus and flexural rigidity. It is possible to obtain
a fixed type diaphragm in which an etch portion having a large internal loss is integrated.
According to the method of the present invention, since the composite sheet can be formed
simply by pressing the composite sheet at different heating temperatures of the cone part and
the edge part, a large number of sheets can be formed in a short time as compared with the
conventional manufacturing method. It has the advantage that the diaphragm can be
manufactured.
4. Brief description of the drawings. FIG. 1 is a schematic view of a tank for an apparatus for
producing a speaker diaphragm in one embodiment of the present invention, and FIG. 2 is a
speaker upper diaphragm of another embodiment of the present invention EndPage: 2. It is
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sectional drawing of the metal mold ¦ die of a breath machine to manufacture. 1 · · · Composite
sheet, 2 · · · · · · · · · · · · · · · · · · · · · · · · · · · upper mold, 6 · · · · · lower mold, 6
······················································································································ Heater. Name of agent Attorney Nakao
and others 1 person □ 1 Figure 2 0 EndPage: 3
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