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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a mixed wire material
used in the present invention in a state of graphite powder orientation, and FIG. 2 is a crosssectional view of a speaker diaphragm. 1 ... molding material, 2 ... graphite powder, 3 ... synthetic
resin, 4 ... diaphragm for speaker.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a molding
material obtained by kneading a synthetic resin and carbon powder. In general, a thin plate
molding material used as a diaphragm for an audio device, particularly as a diaphragm of a
speaker, has a large rigidity at the @ 址 and a Young's modulus X in order to reproduce
efficiently and faithfully over a wide frequency band. It is required that the specific blade / ρ
with the density ρ be large. Heretofore, from these points, wood pulp, Go 11 effect, 1 f--?
Although + 4 / aluminum, titanium and the like have been used, it is difficult to say that any of
them has sufficient characteristics. In addition, as an example using a carbon-based material,
there is a composite material of a disaster fiber and a goose finger, but due to the lubricity of the
surface possessed by the carbon fiber itself, carbon 1 by the synthetic resin effect Due to the
insufficient bonding of the fibers and the large anisotropy of carbon 1 fibers, it is not possible to
obtain high rigidity as a surface like a diaphragm. Therefore, the inventor paid attention to boron
as a material which is light in weight, large in 1ill property, and large in ratio X / が of Young's
modulus E and lfj degree ρ , and carbonized or graphitized synthetic resin previously.
Although a diaphragm was proposed, the shrinkage deformation of the material is equal to 1 in
the carbonization type and graphitization process of the synthetic resin, and it is ascertained that
the problem of causing electrical wiring and the like is realized. In view of such a point, the object
of the present invention is to form a moving plate shape with vibration ≦ to +9 and then
carbonize or graphitize to produce a moving plate for acoustic equipment, which is lightweight
and has high rigidity and To provide a molding material which does not cause deformation of a
material produced in a carbonizing or graphitizing process without impairing the properties
required for a sound board for an instrument 41I, wherein the ratio E / ρ of the Young's
modulus to the density is large. is there. Hereinafter, an embodiment of the present invention will
be described in detail. The molding material hood grain weight 5 to 1 oo 'jl A of one embodiment
of the present invention! ? Graphite powder V of 9μ and polyvinyl chloride resin respectively H:
letter 20 part of graphite powder, polyvinyl chloride resin 30 parts, plasticizer (]), O, P) 10
articles, bath agent (M, K) It is obtained by mixing and kneading 50 parts (both bundles) well.
The speaker vc ': h for forming a speaker diaphragm from this molding material J is molded first
with a desired shape (for example, dome shape, cone shape, etc.) VC frame of the speaker
diaphragm. The molded product is placed in a heating furnace while being held by a mold so as
not to be softened and deformed, and the temperature is gradually raised from room temperature
to about 300114 for about 8 hours, and further 1000 ° C. in a nonoxidizing atmosphere such as
argon and nitrogen. Bake for about 1 hour and carbonize 1A. The vibration crystal obtained in
this way and the black powder 23S are also free of lead powder 4 and carbonized synthetic wood
1fft'v 2 2 sleeve λ [compared, deformation during carbonization is extremely small, and its
density is 1 It has the characteristics of .54 F /, ffl, Young's modulus of 16000 Kf / mj, and the
regeneration frequency is expanded compared with the conventional diaphragm material, and
the distortion is also reduced over that range, and the reproduction is excellent. I made it
4。 -4 or P further, this vibration-H, deformation in the graphite mold 1! When graphitized at
2400 ° C for 5 minutes in an inert atmosphere while holding the same, the density increased to
1.111 F / m, the Young's modulus increased to 18000 Kf /-, and excellent characteristics, W
supply It became the diaphragm V which has 隻 4 <-+ I. In the present invention, it is desirable to
use a resin having a high carbon yield regardless of heat resistance, 31 'plasticity 1111 or a
thermosetting resin. In addition to vinyl chloride, styrene, silicone and other vinyl resins are
suitable, but acrylic, 7x phenol, furan, urea, polyester and other 0 synthetic resins can be used
singly or in combination. . In addition, various kinds of oJ plastics, solvents and the like are
selected and used for the resin. Further, the conditions for heat treatment of carbonization or
graphitization after being formed into the Vc copying plate shape can be appropriately adjusted
depending on the mixed system of resin, plasticizer and solvent. 1, as described above, according
to the molding material of the present invention, it is formed into a diaphragm shape and then
carbonized or graphitized, or a material produced when carbonizing or graphitizing a synthetic
resin by heat treatment It is possible to prevent deformation, to have high accuracy, high mass
productivity, good retestability, domed or cone shaped speakers, and a treble board for
microphones and audio equipment. The powder used is C, which is a town department taken
from carbon, and the heat treatment temperature in the graphitization step can be extremely
leaked, whereby Young's modulus E or the ratio of the ratio to the density and the ratio of six It
can be obtained that a diaphragm can be obtained. Brief description M4 of the section 4 No gt, c,
section 1 [1 section, Figure 2 is a section (a plan view of the speaker diaphragm) in the graphite
powder non-disposed state of the mixing material used. 1 · Molding material 2 · · · Graphite
powder 3 · · Synthetic resin 4 · · · Diaphragm for speakers Utility model registration 細 バ イ オ ア
ア づ 澹 5 agents Hideo Kuwano j ,. Anti j-f "Fig. 1 □. Fig. 2 □ Utility model registration
Applicant Pioneer Co., Ltd. Bo3AA agent Hideo Kuwano "77, inventor's address other than the
above Address 15-4, Omori Nishi, Ota-ku, Tokyo Pioneer Co., Ltd. Name in the Omori factory
Address Teruma Toshima Address 4-15-5 Omori-nishi, Ota-ku, Tokyo Pioneer Co., Ltd. Name of
the Omori Factory Shin-Yoko Seki-Address Tokyo Metropolis Ota-ku Omori-ku 4-Chome 154-5
Pioneer Co., Ltd. Omori Factory Name: Yoshino Toshikazubi ■ 34, r