JPS5444515

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DESCRIPTION JPS5444515
Specification 1, Name of the Invention Loudspeaker diaphragm and its manufacture.
Method
The present invention relates to a speaker diaphragm and a method of manufacturing the same.
Various materials have been proposed as diaphragms for loudspeakers in order to obtain a large
elastic modulus / density ratio. A variety of carbon fiber reinforced synthetic resins have been
proposed, and one of them is a resin cut as a short cut fiber whole matrix material which is
dispersed in paper @ but in this case carbon fibers It is difficult to achieve a total content of 50%
or more, and there are limitations on strength and elastic modulus. As another method, there is a
method in which a yarn obtained by twisting several carbon fibers is woven into a woven fabric
and the whole matrix material is impregnated or laid up. This can increase the strength and
elastic modulus by 3 to 5 times in comparison with the former method, and a characteristic
suitable as a speaker diaphragm can be obtained. The conventional manufacturing method of this
type of speaker diaphragm made of carbon fiber reinforced resin is 11i! Fan-shaped partial pipe
cut-out shown in 1 from carbon fiber reinforced resin plate as shown in iI)), end face 2.2 V?
Buttocks or piles, as shown in the figure, make it the desired vibration shape of the wedge part
conical shape, let this be! Heat and pressure were applied to a pair of male and female molds of
corresponding shapes to cure the resin and form a vibrating EndPage: 1 plate. But this method is
the number of steps. There is a lot of loss of efficiency due to the fan-shaped cut-off portion, and
there is a joint, so there is an asymmetric split loss in use. There is a disadvantage that movement
occurs. An object of the present invention is a loudspeaker diaphragm which ameliorates the
deficiencies of the prior art and has particularly improved characteristics. According to the
present invention, as a non-sizing diaphragm of metal or plastic previously molded to a
predetermined size and shape, or as a flat thin plate full laminate of unshaped metal or plastic A
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carbon fiber woven fabric as a base material and a thermosetting resin as a binding material, and
arranged so as to overlap on one side or both sides of a reinforced plastic prepreg plate,
respectively, At the same time pressing to the mold of the mold is simultaneously heated and
pressurized to form a desired diaphragm shape, and further, it is held for a predetermined time
under heating and pressure, and the binder material is totally cured, and a carbon fiber
reinforced plastic and a laminated material There is provided a method of manufacturing a
speaker diaphragm, wherein the speaker diaphragm is fixed. The details of the present invention
will be described with reference to examples. Table 1 The material, shape and weight of the
laminate as experimental conditions. Table 2 shows the experimental results obtained by
changing the conditions and showing typical conditions for the method of forming and the
forming method. In Example 2 of Table 2 in Table 2, the density of weft yarn and warp yarn is 7
yarns / 011 m) yarn type That is, the number of filaments constituting one yarn is 1000, the
coating weight is 100C, the woven fabric thickness is 0.12 mm, a five-sheet satin-woven high
elastic carbon fiber woven fabric is 100 parts of bisphenol A type epoxy resin, and a curing agent
1- 0.5 parts of cyanoethyl-2-phenylimidazole and 0.05 parts of a hardening accelerating catalyst
are mixed and impregnated in a solution diluted with 200 parts of acetone for 30 minutes at a
temperature of 40 ° C. for 30 minutes in air, Further, it was dried for 30 minutes under aeration
at 80 ° C. for 30 minutes to disperse acetone, and a carbon fiber woven fabric reinforced plastic
prepreg board whose structure and cross-sectional structure are shown in FIG. 3 was obtained.
In the drawing, 94 weft, 10 warps, and 11 indicate impregnated resin. Table 1, Table 2 B has a
truncated cone shape, an outer diameter of 300 mm, an inner diameter of 60111111. Height
7QmmEndPage: 2 Polycarbonate with a thickness of 0, 05 mm, and a horizontal and longitudinal
stretch ratio of 250% each on this prepreg board. The plate f) is stacked on one side only, and
this is stored in the mold shown in FIG. 2, kept at fIA degree P 190 ° C., and moved toward the
fixed mold at a moving mold speed of k5 am / min. , Form into a desired diaphragm shape. After
both molds were closed, the pressure Te was kept at 80 kg under 10 m 2 for 60 seconds under
heating. During the molding process, the yarn of the woven fabric slips and is deformed
according to a deviation k'F like a mold. The epoxy resin impregnated in the woven fabric was
fully brought into contact with the laminated prepreg plate and polycarbonate plate and cured to
obtain a laminated diaphragm having a structure as shown in FIG. 4 as a partially enlarged cross
section. In addition, in FIG. In the figure, 3 is a diaphragm forming material, and in this case,
superposition of a prepreg plate and a polycarbonate plate is shown, 4.5 is a forming die, 6 is a
punching for center hole punching, 7 is a die, 8 is a peripheral portion fixing Indicates the type.
The thickness of the produced diaphragm was 0.14 mm, the density was 1.25 parts g / 'ams, the
tensile strength was 75 kg / mm ", and the longitudinal elastic modulus was 89 QO kg / m-. In
No. 5 of Table 2, the density of the warp and weft. 12 threads / am each, thread type 1000
filament, basis weight 130 g / II2, 120 parts of substituted phenol resin permeating a plain
weave high elastic carbon fiber cloth and 0.6 parts of alkaline catalyst mixed with 200 parts of
acetone The solution was impregnated and dried in 1 air for 25 minutes and further under hot
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air ventilation at 100 ° C. for 10 minutes, and all acetone was scattered. Then, a prepreg plate
whose structure and cross-sectional shape are shown in FIG. 5 was obtained. The numerals in
FIG. 5 correspond to those in FIG. A polyester plate with a thickness of 0.06 mm and a
longitudinal and horizontal cyclic stretch ratio of 300% each is laminated on one side of a
prepreg plate, held at a temperature of 210 ° C. in a molding die shown in FIG.同 r l r cm r 同 l l
l l l l l l l l l 成形成形成形成形成形成形成形成形成形成形成形成形成形成形成形成形成形
成形成形成形成形成形成形成形成形成形成形成形成形成形成形成形成形成形成形成形
成形成形成形成形成形成形成形成形成形成形成形成形成形成形成形成形成形成形成形
成形成形. During this process, the yarn of the woven fabric is wrinkled, and the 0 movable mold
formed by misalignment t is pressed against the fixed mold and further heated up! Hold for 30
seconds as pressure f 100 kg / ad. The polycarbonate plates superposed by the phenol resin
impregnated in the carbon fiber woven fabric are adhered, and the resin is cured to obtain a
diaphragm having a structure shown as a partial cross section in FIG.
In FIGS. 4 and 6, 12 is stacked. Film is shown. This diaphragm has a thickness of 100 mm, a
density of 15 mm 5 and a density of 1.50 g / an, a tensile strength of 81 g / mm 2 and a
longitudinal modulus of 9650 kg / rn-. Example 3 As No. 16 in Table 2, the density of warps and
wefts is 16 / cffi each, yarn type 1000 filaments, weight per unit area 180 g / m 2.8 pieces, high
elastic carbon fiber weave of bisphenol doll epoxy Mix 100 parts of resin, 0.5 parts of curing
agent 1-cyanoethyl 2-7 enyl imizole, and 0.05 parts of curing promoting catalyst, dilute with
acetone 180 @, and impregnate with liquid tube, in air for 20 minutes, Furthermore, it is dried
for 15 minutes under aeration of hot air at a concentration of 100 ° C. and acetone is scattered,
and a prepreg plate 7 having a cross-sectional structure similar to that of FIG. 3 is obtained.
Figure 7 shows an unsized aluminum foil member (laminated plate) 13, 15 'with a thickness of
0.03 mm, which is formed by pressing drawing or extension into a truncated cone with a
diameter of about 6 Q mm and a height of about 70 mm. 8 and arranged on the female die 15 so
that the member 13 is placed in the mold or female die 15 having a complementary shape, as
shown in FIG. Then, the temperature is kept at 210 ° C. for 30 seconds for heating, and further,
the heat compressed nitrogen gas 16 having a pressure of 15 kg 10 J and a temperature of 210
° C. is absorbed and pressed against the mold and held for 6 parts seconds. In this process, the
carbon fiber woven yarn slips and becomes disorganized, the prepreg plate is shaped into the
desired shape together with the aluminum laminate, the laminate adheres to the carbon fiber
reinforced plastic, the plastic hardens, and the sandwich structure is formed. A laminate is
obtained. This diaphragm has a thickness of 0.22 m-density 1.95 g 10 w 1 and tensile strength
86 kg / m- · longitudinal elastic modulus 9200 kg / mm 2. Although the description of the other
examples is omitted, there are some differences in ease of molding processing, economy, etc., but
there are some differences in acoustic characteristics etc. and EndPage: 3 respectively. According
to the present invention, a carbon fiber woven fabric. Since diaphragms of laminated structure or
sandwich structure of reinforced plastic and metal foil or plastic film can be easily obtained,
there are many kinds of high-performance diaphragms corresponding to diversification of
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market required characteristics. It is obtained and the economy is also improved.
4. Brief description of the drawings First meat (a) (b) Fi Forming blade of diaphragm according to
the prior art. Law? FIG. 2 is a schematic view showing an example of a mold suitable for use in
forming a diaphragm according to the present invention. FIG. 3 is a plan view of a prepreg sheet
of five-spun woven carbon fiber woven plastic reinforced plastic. Fig. 4 and Fig. 4 are partial
sectional views of a diaphragm obtained by laminating and forming the prepreg plate and the
polycarbonate film, Fig. 5 is a plan view and sectional view of the prepreg plate of plain weave
carbon fiber woven fabric reinforced plastic, Figure 6 shows this prepreg board and polyester
film. Fig. 7 is a partially cross-sectional view of a fully laminated diaphragm, and Fig. 7 is a
carbon fiber reinforced plastic in a state where it is placed on both sides of an unsized aluminum
sheet tube. Fig. 8 shows a prepreg plate of a tuk, Fig. 8 is Fig. 7; FIG. 6 is a schematic view
showing a method of forming a diaphragm by the arrangement of 4.5.15 is a mold, 9 is a weft,
10 is a longitudinal. Yarn, 11-impregnated resin, 12 is a laminated plastic film, 15, 1 W /
aluminium-plated member (laminated plate), 14 is a base material (prepreg plate). Attorney
Attorney Attorneys 1) Toshiyuki Fig. 1 (α) (b) o Z Fig. EndPage: 473 Fig. 5 Fig. 6 Fig. 6 Fig. 6 off
Fig. 1/8 Fig. , 13EndPage: ５
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