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JPS5466118

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DESCRIPTION JPS5466118
Description 1, title of the invention
Method of manufacturing diaphragm for speaker
3. Detailed Description of the Invention The present invention relates to a method of
manufacturing a novel speaker diaphragm. The conventional speaker diaphragm is required to
have a large size, light weight, appropriate internal loss, etc., and its physical '1 quality factor is
the most important factor in the characteristics of the diaphragm. Various ideas have been
devised and put into practical use. According to such purpose G, a diaphragm made of carbon
fiber base is put to practical use, and the strength of the carbon fiber itself is large; However,
since the mechanical strength of the carbon fiber itself is large, the shape of the vibration plate (a
variety of disintegration occurs when forming this. For example, the most commonly used
diaphragm manufacturing method is obtained by forming a fiber diffused in water, peeling off
the fiber layer deposited on the mesh, pressing or naturally drying it. Manufacturing method of
this kind (The rigidity of the diaphragm is determined by the mechanical strength of the fiber
itself and the degree of entanglement of the fibers (it is extremely poor) and there is almost no
wave of the fiber itself Therefore, in the second setting process, the entanglement of carbon
fibers accumulated in the web mesh can not be extremely obtained (it is impossible to obtain
shape retention and rigidity as a diaphragm). As a means to solve this problem, shape retention
can be achieved by mixing with entangled other fibers (for example, pulp fibers) and forming into
EndPage: 1 and combining carbon fibers with other entangled fibers There is a diaphragm that is
trying to obtain rigidity, but other fibers with small mechanical strength are mixed, and of course
the characteristics of the carbon fiber are sacrificed. In addition, a diaphragm in which fibers are
bonded and bonded by an adhesive regardless of the entanglement of fibers themselves has also
been put to practical use. For example, it is a manufacturing method in which a carbon fiber is
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used as a base in a diaphragm shape, and then a thermosetting resin such as phenol is
impregnated to solidify between the fibers and form into a diaphragm. According to this
manufacturing method, the characteristics of carbon fiber can be utilized relatively and a rigid
diaphragm can be obtained, but as described above, since the carbon fiber has very little
entanglement among the fibers, it is a gap between the fibers When the thermosetting resin
entering the gap Q hardens, pinholes are likely to occur, and the air on both sides of the
diaphragm is communicated to cause so-called air permeability and cause deterioration of the
acoustic characteristics. It becomes. In order to suppress air permeability in such a diaphragm,
the amount of carbon fiber must be increased to reduce the gap between the fibers, so that the
weight of the diaphragm becomes extremely large, resulting in a decrease in acoustic radiation
efficiency.
The present invention solves the above-mentioned drawbacks of the prior art in the diaphragm
using carbon fiber, fully exploits the characteristics of the carbon fiber, is lightweight, has a
suitable internal loss, and completely prevents the air permeability. The method is characterized
by comprising a paper making process, a thermosetting resin impregnating process, a heat
soluble resin coating process, and a pressing process, which will be described in detail below.
First, carbon fibers cut to an appropriate length are diffused in sand water 12 of a paper making
tank 11 to make a paper, and a fiber layer plate 1a deposited in the shape of a diaphragm in FIG.
Next, the fiber layer board 1a is soaked in a thermosetting resin solution such as phenol (FIG. 1b)
to impregnate the thermosetting resin between the fibers and then dried. Two fiber layer boards
1b impregnated with the thermosetting resin in this manner are prepared, and at least one
surface of the opposite surface is coated with the heat-soluble resin 2 and the two sheets are
stacked and heated (heated) (FIG. 1C) Figure 1 d). Thus, the heat-soluble resin impregnated in the
facing surface layer of each of the fiber layer boards 1b in the heat-soluble resin application step
(FIG. 1C) is heated and pressed in the pressing step and melted. When it penetrates into the
surface layer of the fiber layer board 1b to form a thermosetting resin layer, the fiber layer board
of the second board is bonded at its boundary. On the other hand, the thermosetting resin is
melted for the first few seconds in the pressing process to make the mold Q fit, and then cured to
bond the carbon fibers firmly. Therefore, as shown in FIG. 2G, the diaphragm IC molded by the
above manufacturing method forms the middle portion Q of the carbon fiber layer 21 bonded
with a thermosetting resin such as phenol, and the heat soluble resin impregnated layer 22. It
has the following structure. As the heat-soluble resin solution 2, one obtained by dissolving
polystyrene or vinyl chloride with a solvent such as thinner or tetrahydrofuran is suitable. The
pressing conditions in the above-mentioned pressing step (FIG. 1b) differ depending on the type
of heat-soluble resin, but in the case of using the above-mentioned polystyrene, the pressing
pressure is 4 to 5 ky / cm2. It is necessary to press for about 30 to 40 seconds at a mold
temperature of about 180 ° C. The diaphragm IC manufactured according to the present
invention has (1) the heat-soluble resin-impregnated layer 22 in the middle portion of the carbon
fiber layer 21 and therefore the sealing function is complete and the air flow on both sides of the
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diaphragm is completely eliminated. Can be prevented. (2) A layer having a large internal loss is
formed in the middle of the extremely rigid carbon fiber layer 21 rigidly bonded with a
thermosetting resin by the heat-soluble resin-impregnated layer 22 so that bending energy due
to divisional vibration is absorbed. Thus, the reproduction frequency band can be expanded, and
the damping characteristic can be improved to make the frequency characteristic flat.
(3) Since the heat-soluble resin-impregnated layer 22 contains internal carbon fibers, the rigidity
weakness of the heat-soluble resin can be compensated to enhance the rigidity of the whole
diaphragm EndPage: 2. Also, due to its manufacturing method O (1) The heat-soluble resin to be
impregnated is well compatible with phenol, so it is extremely easy to penetrate into the table i
'[Tj portion at the time of coating, It is extremely easy to form an impregnated layer of constant
thickness throughout. (2) Conventional equipment can be used as it is because no special
manufacturing apparatus is used. Etc. have many advantages. As described above (herein, the
manufacturing method Q of the present invention is relatively easy to use a diaphragm having
large rigidity, light weight, and suitable internal loss (this equipment can be manufactured as it is
by using existing equipment as it is) It has an excellent effect from the practical point of view.
4. Brief Description of the Drawings FIG. 1 is a flow chart showing the manufacturing method of
the present invention, and FIG. 2 is a partially enlarged and folded view of a diaphragm
manufactured according to the present invention. 1a is a carbon fiber board, 2 is a heat soluble
resin solution, 21 is a carbon fiber layer, 22 is a heat soluble resin impregnated layer, and IC is a
diaphragm. EndPage: 3
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