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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
method of manufacturing a loudspeaker vibrating structure, and more particularly to providing a
method of manufacturing a loudspeaker vibrating structure comprising a combination of one or
more components. Here, the speaker vibration structure means one having a diaphragm portion
and / or a voice coil winding portion and being composed of 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 conventional acoustic materials, there is a
tendency that contradiction occurs such that the internal loss generally decreases when the
Young's modulus of the diaphragm material is increased. 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 beryllium,
which has problems with toxicity in metallic materials, and ceramic materials that are recently
attracting attention also have high specific gravity and low sinterability. There's a problem.
Electron beam deposition, sputtering, ion plating, OVD, etc. can be used 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. Even if special equipment is required, there is a problem of high cost.
Since the substrate is much thicker than the ceramic layer in this method, the contribution rate of
the characteristics of the ceramic layer is not high. As described above, it is difficult to provide a
diaphragm of a speaker that 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 direction, rigidity in the radial direction is required to be large, and is
the skin material of the 91 聚 surface subjected to both tensile force and compressive force?
Required In addition, it is difficult to form a speaker diaphragm having a multi-fiber shape and a
ceramic material as well as the honeycomb structure. In any case, there is a dilemma that in
order to improve the performance, materials having small specific gravity and good physical
property values are required or it is difficult to obtain a material that satisfies all of them.
SUMMARY OF THE INVENTION It is an object of the present invention to provide a method of
manufacturing a speaker vibrating structure which simultaneously satisfies the characteristics (1)
to (3).
Further, according to the present invention, it is possible to provide a method of manufacturing a
vibrating structure made of a ceramic material in which two or more constituent members are
integrated, for example, a voice coil winding frame and a vibrating plate. Furthermore, it is
possible to provide a method of manufacturing a ceramic vibrating structure having a postconstricted shape such as a honeycomb structure. SUMMARY OF THE INVENTION In order to
achieve the above object and provide a speaker vibrating structure having excellent reproduction
characteristics, the method of manufacturing a speaker vibrating structure according to the
present invention is a material which becomes ceramic by firing respectively. Two or more
components including the plate portion and / or the voice coil bobbin are formed, and after
bonding or bonding the two or more components, they are integrally formed by firing. Examples
of the organosilicon polymer to be used in the method of the present invention include
polysilmethylene polymers having a number average molecular weight of about 100 to
1,000,000, preferably about 5 L) O to 20,000. These are generally referred to as polycarbonates.
These organosilicon polymers can be synthesized, for example, by a method of subjecting
monosilanes to thermal decomposition, a method of subjecting polysilanes to thermal
decomposition, or the like. In addition, other ceramics such as alumina may be used by firing.
Also, as the base material used in the method of the present invention, organic polymer
substances of either natural natural polymer substances or synthetic polymer substances can be
cited. As the polymer substance, for example, cellulose type, protein type, isoprene type, pitch
type, lignin poval type, polyvinyl alcohol type, polyvinyl chloride type, polyvinylidene chloride
type, polyacrylonitrile type, furan resin type, polyester type Polyolefin, polystyrene, phenol resin,
polyamide, polyimide, polyamideimide, polybenzimidazole, polyurethane, polyphenylene sulfide,
polyphenylene oxide, polysulfone, polyfluoroethylene, etc. . These base material materials can be
easily formed into components of a speaker vibration #I assembly, and when fired in a vacuum or
non-oxidizing atmosphere, a structure consisting of fibrous, granular and / or thin film-like
carbon 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 polymer is powdered and attached
and then KH, shaped, etc. by wetting.
Further, the organosilicon polymer can be impregnated or adhered 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 organosilicon polymer to be contained in the substrate can be 50 to 200% with
respect to the weight of the substrate in either the case before the formation or the case after the
formation. 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 winding frame is disadvantageously produced. 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 c, preferably about
800-1800 C, in a vacuum or non-oxidizing 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, it is left for at least
several minutes in an atmosphere of at least one gas selected from aeration gas, ozone, oxygen,
and hydrogen, particularly an oxidizing gas atmosphere, or from room temperature to about
600C. A method of heating at a low temperature up to a low temperature or a method of
irradiating ultraviolet rays, γ rays or electron beams at room temperature in a non-oxidizing
atmosphere such as true wall or inert gas when oxidation is not preferable. 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 molding melts or softens in the heating process, the infusibilization step can prevent
deformation due to melting of the silicon molding or softening by making the organosilicon
polymer infusible. . EXAMPLE The shape of the diaphragm portion of the speaker structure
manufactured according to the present invention may be any of a cone shape, a dome shape and
a honey force A type. In particular, in the case of the dome type diaphragm, as shown in FIG. 1,
the diaphragm (1) impregnated with the% organosilicon polymer solution and the voice coil
winding frame (2) are bonded and then fired. In the case of a dome-shaped diaphragm integrally
formed with an edge portion, as shown in FIG. 2, a diaphragm (4) integrally formed with an edge
(4a)-'F and a voice coil winding frame (5) Separately form only with the base material, adhere and
integrate the viscous liquid of organosilicon polymer as an adhesive prior to firing, infuse the
adhesion part, and impregnate the whole with organosilicon polymer solution, By firing, the
dissbyker vibrating structure is integrated.
Furthermore, in the case of a honeycomb diaphragm, as shown in FIG. 4, a base material
impregnated with a material to become a ceramic by firing two surface layers (six baka and
honeycomb core layer (8) is separately used. The speaker vibrating structure as shown in FIG. 6
is formed by bonding and then firing and integrating, and bonding an ordinary paper voice coil
bobbin (9) to one surface layer (7). You can get Next, an embodiment of the present invention
will be described with reference to the drawings. EXAMPLE 1 Cotton Linter 5 II is dispersed in
water, paper-made into a wet paper of 20,58,255, and after sufficient dewatering, the shape of
the diaphragm with the edge portion (4a) shown in FIG. The molded product was pressuremolded by using a mold and dried to obtain a woven molded product having a thickness of about
50 μm. Since this woven and molded body shows a shrinkage of 65% of vertical and horizontal
valleys in the later firing step, it is molded in advance in anticipation of this shrinkage. This yield
can be substantially vcOvc by containing SiO fibers, whiskers and the like at about 5φ or more.
The woven molded body was molded such that the dimensions after firing had the following
values in FIG. R=50tnK、H=6±[1,5*i、h=4±0.5mtl。 D-29 ± 0.2 m,
L = 41 ± Q, 5 mm A voice coil bobbin with the same material and the same inner diameter is
used for this woven and formed body, and a viscous liquid of the organosilicon M base is used for
the adhesive After bonding and integrating to the diaphragm-shaped woven molded product, the
bonded portion is infusibilized in air of 201 1 to 600 C, and then the whole is partially covered
with a siloxane bond by a number average molecular 11300 of poly Immersed in a 20 wt%
solution of carbosilane in toluene and dried at 50 C or less. The adhesion amount of
polycarbosilane was 191. Next, the woven or molded body is dried and subjected to the
infusibilization treatment, and then heated to 60 DC at a temperature rising rate of 100 U / h in a
nitrogen atmosphere furnace, and thereafter at a temperature rising rate of 200 to 300 p / h for
1,200 t: ' It was heated to and kept at that temperature for 10 minutes and then cooled to room
temperature. In this way, a vibration structure of a speaker made of silicon carbide-carbon
composite material was obtained. The cotton linter wet paper. The properties as a diaphragm
material of the fired flat plate obtained by impregnating and firing a flat plate having a thickness
of about 50 μm in the same manner as described above without pressing using a mold are
measured by the vibration lead method. The following results were obtained. Density = about 2 to
2.41 / [alpha] 3 [deg.]-Yg ratio = 10 GPa. Resonance sharpness = about When the
reproduction characteristic of the sintered speaker vibrating structure (FIG. 2) was measured,
this structure had a transmission output frequency characteristic, reproduction band, efficiency
predicted from the characteristic value of the flat-plate baked product. It is suitable for hi-fi
reproduction in terms of
Specific Example 2 A speaker vibrating structure provided with a honeycomb diaphragm was
manufactured as follows. In FIGS. 6 and 4, two surface layers (6) (a chemical valve as a force
base, and other excessive paper materials are used to make a 200 to 220 μm thick paper 9 by
the usual manufacturing method, and this is finalized The thickness was adjusted to 140 to 150
μm by means of a brush in consideration of the finished 9 thickness, and vertical: 64.5 battles
each, and two groups # of weight 50 to 6 [, 1 ■ were obtained. On the other hand, for the
honeycomb core layer, a 100 μm thick kraft paper is used to form a honeycomb having a cell
size of 3 m and a core thickness of 6 dragons, and the same as the surface layer (61 (7). As a
result, in consideration of the shrinkage of -30% in the vertical and horizontal directions and 25% in the thickness direction, the substrate was cut to 34.29 in length and width, to obtain a
base material of about 10 U in weight. This core layer is impregnated with a 10 to 2 U wt%
solution of organosilicon polymer and dried, and the steps 82 to 5 are repeated. After
impregnation, the weight of the solvent is 120 to 150. Volatilized to some extent, combined with
air drying and infusibilization (polymerization) 200 to 220 t? Do hot air drying for 50 minutes. A
10 to 20 wt% solution of xylene of an organosilicon polymer used for impregnation is volatilized
from xylene to give a viscosity of 5000 to 8000 cps as an adhesive QO). And bond the previously
obtained hexahedral substrate. The adhesive is, of course, sintered to form a part of a honeycomb
structure by firing, and may be formed into a sheet and placed. Once hot-air drying is performed
at 200 C for 15 to 20 minutes to dry and insolubilize the adhesive layer, the honeycomb
structure having a weight of 200 to 220% is dipped again in a 10 to 20 wt% solution of xylene
and dried. Return the process appropriately. At this time, the amount of impregnation is
equivalent to one step! l 16-8% increase. After appropriate weight is achieved, drying is carried
out at 200 to 220c for 20 to 30 minutes, and then the honeycomb structure is held with a
graphite plate and fired at 1100 to 1200 C for 10 to 30 minutes in nitrogen. As a result, there
was obtained an integrated inorganic honeycomb structure having a total weight of 150 to 220,
between vertical and horizontal 241111 each having a thickness of 2.5 to 2.7. A voice coil
winding frame (9) with a diameter of 17 mm was adhered to this honeycomb structure to obtain
a speaker vibration assembly. When the output frequency characteristics of this vibrating
structure were measured, it was compared with the conventional one (broken line) composed of
surface layer 16) + 7) and honeycomb core layer (8) aluminum as shown by a solid line in FIG.
The reproduction zone was expanded and the peaks and valleys of the divided vibration zone
were small and suitable for high fidelity reproduction.
Effect of the Invention In the M method of the speaker vibrating structure of the present
invention, since two or more components forming a senmix by firing are joined M or joined and
then fired, the ceramic vibrating structure having a complicated shape is formed. To provide a
speaker vibrating structure capable of simultaneously satisfying low density, high Young's
modulus, high internal loss, which was difficult to obtain by conventional materials, and thus
having excellent reproduction characteristics. it can.
Brief description of the drawings
1 to 4 show an embodiment of a speaker vibration IJh structure manufactured according to the
manufacturing method of the present invention, and FIG. 1 shows a first embodiment, wherein a
dome-shaped diaphragm and a voice are shown. FIG. 2 is a cross-sectional view of a structure in
which a coil winding frame is bonded and integrated, and FIG. 2 shows a second embodiment,
and a cross section of a structure in which a dome-shaped diaphragm and a voice coil winding
frame are bonded and integrated. Fig. 6 shows the sixth embodiment fIl, and Fig. 6 is a sectional
view of a speaker diaphragm having a honeycomb diaphragm, and Fig. 4 shows each member of
the honeycomb diaphragm shown in Fig. 6. 5 is a graph showing the reproduction output
frequency characteristics of the speaker vibrating structure manufactured according to the
present invention.
In the reference numerals used in the drawings. +1) 14) ··································································· Voice
coil winding frame (3) ······ ....... voice coil (6X7) ········· de 赴 surface layer,.
(8)91006.11091. Honeycomb core island (LO) ············· Adhesive. Agent Saturn
Katsumasa Tsukasa Bagu 芳 〃 Sugiura Shunki Figure 1 Figure 2 Figure 3 Figure 4