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JPS59188296

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DESCRIPTION JPS59188296
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker vibrating structure and a method of manufacturing the same, and is intended to provide
a speaker vibrating structure adapted to obtain particularly good reciprocity characteristics.
Here, the speaker vibrating structure means one having a diaphragm portion and / or a voice coil
winding portion respectively and being composed of one or a plurality of constituent members.
Background art and problems thereof The physical properties required of the speaker diaphragm
are (1) high Young's modulus, (2) low density, and (3) large internal loss. Such a material
broadens the bistonic motion band, suppresses unnecessary peaks, and enables high fidelity
reproduction with less distortion. However, in the case of the conventional acoustic material,
there is a tendency that contradiction such that the internal loss generally decreases as the
Young's modulus of the diaphragm material increases. Conventionally, various methods have
been studied to increase the Young's modulus, and diaphragms made of metal or inorganic
material have been actively developed. However, there is no useful material other than IJ IJum
which has a problem of toxicity in metallic materials, and ceramic and high-high modulus
ceramics which are recently attracting attention also have high specific gravity and linear
sintering. There is a problem in that it is sex. There are electron beam evaporation method,
sputtering method, ion plating method, CVD method, etc. as a method of forming a target ceramic
layer by a chemical or physical method on a metal substrate having a relatively high Young's
modulus. Also, special equipment is required, resulting in high cost. Furthermore, in this method,
the contribution of the characteristics of the ceramic layer is not very high because the substrate
is much thicker than the ceramic layer. As described above, it is difficult to provide a diaphragm
of a speaker which simultaneously satisfies the physical properties (1) to (3) with conventional
materials. In addition, a honeycomb diaphragm is introduced as a structurally improved rigidity
of the diaphragm itself. In the honeycomb structure, since vibration is propagated in the radial
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direction, the rigidity in the radial direction needs to be large, and the skin material on the
surface is required to have a small elongation because both tensile force and compressive force
are applied. Ru. In any case, materials with small specific gravity and good physical property
values are required for performance improvement, but there is a dilemma that it is difficult to
obtain materials that satisfy all the requirements. SUMMARY OF THE INVENTION It is an object
of the present invention to provide a speaker vibrating structure which can simultaneously
satisfy the characteristics (1) to (3). Further, according to the present invention, it is possible to
provide a vibrating structure in which the voice coil winding frame and the diaphragm are
integrated.
SUMMARY OF THE INVENTION In order to achieve the above object and to provide a speaker
vibrating structure having excellent reproduction characteristics, in a speaker vibrating structure
according to the present invention, a component including a diaphragm portion contains 8iC as a
main component The I-LJ LUX is formed by a silicon carbide-carbon based composite material
having fibrous, granular and / or thin film carbon. Further, according to the method of
manufacturing a speaker vibrating structure according to the present invention, a base material
that becomes a structure composed of fibrous, granular and / or thin film-like carbon when fired
in a non-oxidizing atmosphere, mainly contains carbon and silicon. (75) A material comprising an
organosilicon polymer force) contained in the substrate, a force formed by the material) a force
P), and a molded body having the shape of a member including a diaphragm portion, The molded
body is fired to form the component. I have a number average molecular weight of about 1oo to
1,000,000. The polysil methylene-based polymer preferably is about 500 to 20,000. These are
generally called polycarbosilanes. These organosilicon polymers can be synthesized, for example,
by a method of thermally decomposing a monosilane, a method of thermally decomposing a
polysilane, etc. Also, as the base material used in the method of the present invention, Examples
include organic polymer substances of either natural polymer substances or synthetic polymer
substances. As the polymer substance, for example, a cellulose type, t, a carbon type, an isoprene
type, a pitch type, a lignin poval type, a polyvinyl alcohol type, a polyvinyl chloride nail, a
polyvinyl chloride vinyl chloride type, a polyacrylonitrile type, a furan resin , Polyester,
polyolefin, polystyrene, phenol resin, polyamide, polyimide, polyamideimide, polybenzimidazole,
polyurethane, polyphenylene sulfide, polyphenylene oxide, polysulfone, polyfluoroethylene And
so on. These base material materials can be easily formed into the component parts of the
speaker vibrating structure, and when fired in a true or non-oxidizing atmosphere, a structure
comprising fibrous, granular and / or thin film-like carbon can be obtained. It can be formed. In
the method of incorporating the organosilicon polymer into the molded substrate, a method of
impregnating or adhering a solution or a heated melt of the organosilicon polymer to the sheet
substrate before molding is required, and the sheet substrate is required Accordingly, there is a
method in which the organic silicon oxide polymer is pulverized and attached after being wetted
and molded.
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Further, the organosilicon polymer can be impregnated or attached to the molded body having
the shape of the component of the speaker structure in the same manner as described above. The
amount of the organic silicon oxide polymer to be contained in the substrate can be 50 to 200 in
relation to the weight of the substrate regardless of whether it is contained before forming or
after forming. Outside this range, when the speaker diaphragm is manufactured, those having the
preferable physical properties of the above (1) to (3) can not be obtained, and a speaker vibration
structure in which the voice coil winding frame and the diaphragm are integrated. In addition,
the weight or strength of the voice coil case is disadvantageous. In accordance with the method
of the present invention, the shaped body containing the organosilicon polymer is fired in a
temperature range of about 700-2000 tL: ', preferably about 800-1800 C, in a vacuum or a nonoxidizing gas atmosphere such as an inert gas. . In addition, the organic silicon polymer in the
molded product can be infusibilized before the firing and the firing can be performed in a better
condition. As a method of this infusibilization, any one or more gases selected from air, ozone,
oxygen and halogen, especially an oxidizing gas atmosphere, are left for several minutes or more,
or a low temperature from room temperature to about 600 C In the case where oxidation is not
preferable, it is possible to use ultraviolet irradiation, ?-ray irradiation or electron beam
irradiation at room temperature in a non-oxidizing atmosphere such as vacuum or inert gas. And
in this infusibilization process, the bridge | crosslinking with the base material in a molded object
can be performed. This crosslinking structure can prevent volatilization or melting of the
organosilicon polymer in the firing step, and can increase the firing residual rate. In addition,
even if the base in the molded body is melted or softened in the heating process, the
infusibilization step can prevent deformation due to melting or softening of the molded product
by insolubilizing the organosilicon 1 unit. The shape of the diaphragm portion of the speaker
structure of the present invention may be any of a cone shape, a dome shape and a honeycomb
shape. Particularly in the case of a dome-shaped diaphragm, as shown in FIG. 1, the diaphragm
(1) and the voice coil winding frame (2) are integrally formed, and the voice coil (3) is wound
around this winding frame (2). It is possible to avoid the deterioration of the reproduction
characteristics due to the adhesive having a generally low Young's modulus, since it is not
necessary to bond the diaphragm and the voice coil with the adhesive as in the prior art. In the
case of a dome-shaped diaphragm in which the edge portion is integrally formed, as shown in
FIG. 2, the diaphragm (4) and the voice coil winding frame (5) are integrally formed in the edge
portion (4a). Are separately formed on the substrate alone, and the viscous liquid of
organosilicon polymer is used as an adhesive to bond and unite before firing, and after the
bonded part is infusibilized, the whole is impregnated with the organosilicon polymer solution
That the speaker vibrating structure can be integrated by Kill.
Furthermore, in the case of a honeycomb diaphragm, as shown in FIG. 4, two surface layers (61,
(a sword is formed and fired according to the method of the present invention, these surface
layers (61 By bonding a honeycomb core layer (8) of the present invention to, for example, a
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heat-sealing adhesive film + 10)% a ?, and bonding a normal paper voice coil winding frame (9)
to one surface layer (7) The speaker vibration structure as shown in FIG. 6 can be obtained. Also
in this case, as in the case of the dome-shaped diaphragm shown in FIG. 2, the winding frame (9)
and the surface layer (6. 6 (7)) of the diaphragm are formed of the same kind of base material,
and the impregnation-baking step Can be integrated. Next, specific examples of the present
invention will be described with reference to the drawings. EXAMPLE 1 5 g of cotton linters are
dispersed in water and paper-made into a wet paper of 205 О 255 m, sufficiently dewatered,
and using a part thereof, it has the shape of a diaphragm with an edge portion (4a) shown in FIG.
It was press-molded by a mold and dried to obtain a woven molded product having a thickness of
about 50 ?m. Since this woven and molded body exhibits 35% and 35% shrinkage in the
subsequent firing step, it is molded in anticipation of this shrinkage in advance. This shrinkage
can be made substantially O by containing about 5% or more of SiC fibers, whiskers and the like.
The paper body was shaped so that the size after firing had the following values in FIG. ? = 60
fight, H = 6 ▒ 0.5 tars, h = 4 ▒ 0.5 am, D?22 ▒ 0.2 y, L = 41 ▒ 0, 5 ?The resultant was
immersed in a 20 wt% xylene solution of polycarbosilane having a number average molecular
weight of 1,600 and including 100 parts by weight, and dried at 50 U or less. The amount of
polycarbosilane attached was 191 mp. Subsequently, the woven and formed body is subjected to
the infusibilization treatment in a full air of 200 to 300 C, and then heated to 60 DC at a
temperature rising rate of 100 C / h in a nitrogen atmosphere furnace; The temperature was
raised to 120 DC at a heating rate of OC / h, maintained at that temperature for 10 minutes, and
then cooled to room temperature. In this way, a diaphragm of weight 110 made of carbon
silicon-carbon composite material was obtained. The flat sheet of about 50 ?m in thickness is
impregnated and fired in the same manner as described above without the pressure molding of a
cotton linter wet paper or a mold, and vibration is performed by the vibration lead method. The
characteristics of the plate material were measured to obtain the following results 7'n.
Midsummer-about 2 to 2.41 / ? 3, Young's modulus = 10 GPa. Resonance sharpness = about
100.degree. The above-mentioned vibration recovery body.sup..sup..sup..sup..sup..sup..sup. + And
paper voice coil winding frame (5) are adhered to form a speaker vibration structure, and its
reproduction characteristic is measured. It was pre-preferred.
Specific Example 2 A speaker vibrating structure provided with a honeycomb diaphragm was
manufactured as follows. In FIGS. 6 and 4, two surface layers (6J (7) V formed two flat baked
products of thickness 60 ?m, length: 24 squares each from cotton linter as described in Example
1). I got it. The amount of polycarbosilane attached to each baked product was 180 ░, and the
Mk after baking was about 8D each. The two baked products (61, (71 О, 24 О 24 О 3 Irm V)
aluminum honeycomb core layer (mtt 107119) were bonded and integrated by a heat fusion
bonding adhesive film. A voice coil winding frame (9) having a diameter of 18 mm was adhered
to the honeycomb structure to obtain a speaker vibrating structure. When the output frequency
characteristic of this vibrating structure was measured, as shown by the solid line in FIG. 5, the
reproduction band is expanded compared to the conventional one (broken line) in which the
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surface layers (6) and (7) are made of aluminum. And the peak and valley of the divided vibration
zone is small and suitable for hi-fi reproduction. EFFECTS OF THE INVENTION In the speaker
vibrating structure of the present invention, the constituent member including the diaphragm
portion is an aspect ratio silicon-carbon based material having fibrous, granular and / or thin film
carbon in a matrix containing SIC as a main component Since it is formed of a composite
material, it can simultaneously satisfy low density, high Young's modulus, high internal loss,
which were difficult to obtain by conventional materials, and thus speaker vibration having
excellent reproduction characteristics. A structure can be provided.
[0002]
Brief description of the drawings
[0003]
1 to 4 show an embodiment of the present invention, and FIG. 1 shows a first embodiment, and is
a cross section of a structure in which a dome-shaped diaphragm and a voice coil bobbin are
integrally formed. FIG. 2 shows the second embodiment fll, in which the dome plate diaphragm
and the voice coil winding frame are bonded and integrated 7 ? (cross section of the structure,
and FIG. 6 shows the sixth embodiment). (A cross-sectional view of a speaker diaphragm having a
nick-shaped diaphragm), FIG. 4 is a perspective view showing respective members of the
honeycomb diaphragm shown in FIG. 6, and FIG. 5 is the present invention. Is a club showing a
reproduction output frequency special method of the speaker vibrating structure according to
the above.
In the reference numerals used in the drawings, (IX4)... Diaphragm (4a)....... (3)
иииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии Honeycomb
core Layer ?1 cll) иииииии Adhesive film. Agent Souvenir Souvenir Katsuho Fubuchi Yoshio I Sugiura
Shun Taka 1st Ein 2nd @ @ 3rd 4th @
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