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JPS54114233

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DESCRIPTION JPS54114233
Description 1, title of the invention
Speaker diaphragm and method of manufacturing the same
3. Detailed Description of the Invention The present invention relates to a diaphragm for a
speaker. Generally, the diaphragm for a speaker is manufactured by mixing and forming a paper
valve and other fibers including synthetic fibers, heating and pressing, and forming the same. Ru.
Such a speaker diaphragm needs to have sufficient rigidity to withstand vibration, but in order to
overcome the resonance of the diaphragm itself by one, it is required to have a large mechanical
internal loss as well. In order to solve such technical problems, there is known a diaphragm for a
speaker which is formed of a non-woven fabric made of synthetic fibers as a paper net and into
which a paper valve fiber is made and heated and pressed. However, since paper valve fibers are
generally short fibers, they do not enter the fibers of the non-woven fabric and are not
completely entangled, and the bond between the direction fibers is weak and has the
disadvantage of peeling. The present invention ameliorates these drawbacks and simplifies the
manufacturing process, and provides a speaker diaphragm having excellent acoustic
characteristics. EndPage: ?
Speaker diaphragm and method of manufacturing the same
The following is a detailed description of the present invention. LI) Sand water with a
predetermined amount of dispersant (surfactant), thickener added IJ n (glass, glass fiber (4 m to
12 m thickness 4 to 10 microns иииииииииииии 100 parts by weight The fibrous thermoplastic resin is
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mixed with 10 to 20 parts by weight of a binder ('a length 4 gage 4 to 6 microns)... As the fibrous
thermoplastic binder, for example, a fibrous vinylon intermediate (PVA (fiber)) to be spun and
stretched for a predetermined length for spinning and stretching polyvinyl alcohol (pvA) solution
1 is used. This vinylon intermediate is a thermoplastic synthetic fiber having the molecular
structure of: other synthetic fibers (in comparison with this, they are more hydrophilic, do not
melt in normal temperature water, and are not soluble in high temperature water (60-80 ░ C. or
higher)-) It has the property of melting only at the same time, dewatering after melting (thereby
having a strong adhesive function which can not be easily released unless it is resolidified and
resolidified to high temperature water). (II) Glass fiber suspended and dispersed in sand water
and vinylon intermediate were formed into a sheet by a known method, and as shown in FIG. 1Q,
glass fiber (1) and vinylon intermediate (2) were equally mixed. In the three-state, i.e., the vinylon
intermediate (2) is mixed over the glass fibers (1) and deposited on the web. [Sodium] Sand water
in which paper pulp fibers are suspended and dispersed is poured into the paper making tank,
and the deposited layer (4) of glass fiber (1) and vinylon intermediate (2) is formed into a paper
net, 2) As shown in the figure (3) [rV] substrate (a part of the paper pulp fibers (3) penetrates the
surface of the deposited layer (4) and the space in the vicinity thereof to form the entangled
substrate (5) Dehydrate until the water content of 5) becomes about l? ~20 и% by weight ratio.
[V] The substrate (5) is heated and pressurized under the conditions of a mold temperature of
180 ░ C., a press pressure of 4 mm, and a press time of 10 seconds in the above watercontaining state to complete predetermined diaphragm shape Q and completed . In this forming
step Q, the substrate (5) is heated in a water-containing state (al, vinylon intermediate (2) is
softened and melted in high-temperature Drying (Cogging and re-coagulation to bond the glass
fiber (1) and the glass fiber (1) with the intertwined paper pulp fiber (3) into the space portion
between the glass fiber (1) and the surface of the glass fiber deposited layer and its vicinity , Is
formed into a predetermined diaphragm shape. In the example of J-, the forming process (the
pressing conditions in this case are appropriately determined (this is mixed with the glass fibers
(1) by partially melting the vinylon intermediate (2)). The vinylon intermediate (2) can be left as a
diaphragm-constituting fiber.
In the above manufacturing method, a glass fiber (1) and a vinylon intermediate (2) are mixed
and formed to form a deposited layer (4), and the deposited layer (4) is used as a paper net on
which paper pulp fibers ( 3) Because it is a method of depositing, heating and pressing it for
molding, unlike the method of depositing paper pulp fibers on it as a conventional method, as a
prefabricated non-woven fabric of the type Q, I !!! The manufacturing process is greatly
simplified, and the molding process (2) between the deposited layer (4) between the glass fibers
(1) and the glass fibers (1) not having a self-adhesive function and the paper pulp fibers (3)
Bonding takes place simultaneously, which has the advantage of being suitable for mass
production, coupled with the simplification of the manufacturing process. Moreover, the
diaphragm manufactured in this way has the following characteristics. The paper pulp fibers (3)
and the sediment layer (4) are deposited since the paper pulp fibers (3) enter the space of the
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surface of the sediment layer (4) and the vicinity thereof and are entangled. Bond strength is
strong and there is no risk of peeling. Second, the adhesion between the glass fibers (1) and
between the glass fibers (1) and the paper pulp fibers (3) is bonded to vinylon intermediate (2)
(this is bonded, and this vinylon intermediate (2) The adhesive strength is much higher than that
due to the entanglement and hydrogen bonding of paper and pulp fibers (it is stronger, and
vinylon intermediate (2) is a synthetic fiber, and has the property of melting only in high
temperature water, water Bonded oak (not loosened by the penetration of (normal temperature),
because it is not loosened, the deposited EndPage consisting of glass fiber (1) EndPage: 2 layers
(4) 9) Thus the diaphragm itself has high rigidity, tensile strength, rupture strength and fold
resistance. (The water resistance strength is dramatically increased by 1), so deterioration and
breakage of the diaphragm due to continuous radical vibration and changes in diaphragm mass
due to moisture absorption are eliminated, and expected diaphragm characteristics are
maintained for many years. it can. Third (this, there is a space in the sediment layer (4), the
apparent .8 degree is smaller, and the mass is also smaller, so the superiority of high-] property,
low density and mass Have. 4th G, the fiber length and thickness of glass fiber (1) can be set
arbitrarily, and these can be controlled at a constant level, and since it is not impregnated with
excess synthetic resin, glass fiber (1) is retained The unique property is not reduced. The present
invention is not limited to the embodiment described in E. The deposited layer can be formed by
using synthetic fibers such as glass fiber (1), carbon fiber, polyimide fiber and the like, Also in
these embodiments, the same effect is held. (The present invention mixes and forms synthetic
fiber (1) such as glass fiber, carbon fiber, polyimide fiber, etc. and fibrous 9 'thermoplastic binder
(2) to form a deposit 4 (4) (This is characterized in that the paper valve fiber (3) is deposited,
heated, pressed, and formed on the deposited layer (4), so that the manufacturing process is
significantly simplified (this, especially the interlayer) It has the advantage that an excellent
loudspeaker diaphragm without peeling can be provided.
4. Brief Description of the Drawings FIG. 1 and FIG. 2 are views showing the structure of the
speaker diaphragm in a manufacturing process of the present invention. (1) is a synthetic fiber,
(2) is a fibrous thermoplastic binder, (4) is a deposited layer, and (3) is a paper pulp fiber.
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