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・-I Name Koji Ogi (from l)-Name & a aIllA Person's Address Tokyo 8 Meguro-ku Aobadai 6chome 17th Name (869) Rio Co., Ltd. Representative Tsuboi-Part 4s List of dysentery 4R-108745
[phase] Japan Patent Office ■ Japanese Patent Application Laid-Open No. 59-E302150
published Japanese Patent Application No. 50. (1975) '5.24 Office internal reference number 乙
4-6J-, Fj- specification, the diaphragm cloth of the speaker of the invention is impregnated with a
thermosetting resin, heated and pressed to form a styrene pig A speaker diaphragm
characterized in that it is impregnated with gen rubber or nitrile butadiene rubber.
2, the scope of claims
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a diaphragm
commonly referred to as a chamber attached to the cone of a cone-shaped speaker and a
diaphragm of a dome-shaped speaker, and more particularly to a cloth-made diaphragm. As
illustrated in FIG. 1, a spherical arc-shaped diaphragm 2 (commonly referred to as a chamber),
which itself vibrates with the cone paper, is attached to the inner periphery of the cone paper 1
to improve sound quality and characteristics. Dustproof work. Cone-shaped, to force the use of
force is conventionally used. When the cloth 2 is used as the diaphragm 2 in consideration of
sound quality, the sound of the high-perimeter skin area is disturbed as shown in FIG. 2 if the
cloth is not closed. Therefore, a damping agent is applied to the diaphragm for blocking, and
resonance of the diaphragm is suppressed, and holes 3aQ are formed in the pole 3 as shown in
FIG. 1 or holes in the bobbin 5 of the voice coil 4 (shown in FIG. ) To release air. In order to seal
the conventional cloth, a cloth impregnated with a thermosetting resin such as phenol, heated
and pressure-molded is adhered to corn paper, and after the adhesive is dried and solidified, the
damping agent is added. It is applied. However, after bonding the diaphragm to corn paper, it is
necessary to take a sufficient drying time for the N agent, and it takes a long time to obtain a
finished product after bonding, and even if the drying of the adhesive is sufficient, the damping
agent There is a possibility that the adhesive portion may be broken by the solvent, and
furthermore, the application of the above-mentioned damping agent becomes hand-painted, so
that there is a drawback that the uniform coating is not good even from the appearance and
appearance. In the conventional dome-shaped diaphragm as shown in FIG. 3, after a
thermosetting resin such as phenol is applied to the cloth and heats and press-molds it, the biscroy EndPage: 1-based damping agent is used. After coating or impregnating a cloth with
thermosetting S + fat, it is coated with a rubber-based resin, and manufactured by a method of
heating and pressing. However, in the former method, since the application of the damping agent
is performed by hand coating or the like, it is difficult to uniformly apply the agent, the
workability is poor, and the braking is performed with the diaphragm attached to the voice coil
bobbin or frame. In order to apply the agent, contact with other members: There is a possibility
that the solvent of the damping agent may get in the way of ms. Although the latter method
improves the uniformity and workability, it has a drawback that it is likely to be deformed or
deformed due to the elastic force of the rubber-based resin during molding. The present
invention is a diaphragm which can be applied to both cone-shaped and dome-shaped
loudspeakers, which has been made to eliminate the above-mentioned conventional drawbacks,
in which a cloth is impregnated with a thermosetting resin, and is molded by heating and
pressing. And impregnating 8BR or NBR into a heat-pressed compact, as described in the
following, by impregnating with styrene butadiene rubber (hereinafter abbreviated as SBR) or
nitrile butadiene rubber (hereinafter abbreviated as MB′′R). As a result, sufficient elasticity
and damping action and fabric closing action can be obtained, and uniformity, adhesive strength
and workability can be improved.
Hereinafter, the present invention will be described in detail. A cloth made of silk 4, hemp, cotton
or the like is impregnated with a thermosetting resin such as phenol, and is formed into a pre- ≧
arc 171 while heat is applied. The molded product is mixed with 8BR2 in a ratio of 1 or more of
denatured phenol resin, mixed with toluene or xylene as a solvent, or mixed with a ratio of 1 or
more of phenol resin in NB52, and impregnated with methyl ethyl ketone as a solvent In the case
of a cone type speaker, it is simultaneously applied to corn paper and the solvent is evaporated
and dried. In the case of a dome-shaped speaker, the molded product is impregnated with 5BR4
or NIjR, which is then attached to a voice coil bobbin or a frame and dried. As described above,
according to the present invention, since a fabric is impregnated with a thermosetting resin and
the molded product which has been heated and pressurized is impregnated with SBR and NBR. In
comparison, uniform diaphragms can be obtained, operation time can be shortened, and damping
agents can not adhere to adhesives of PLT mourning members such as cones, voice coil bobbins
and frames. Furthermore, there is no deformation or deformation as compared to those after heat
/ pressure molding after being impregnated with a rubber-based resin. Moreover, the completed
diaphragm is not subject to temperature and humidity 'in'. Since SBR and NBR have good
adhesion, other adhesives can be easily and reliably adhered to the required members after
drying, and SBR. The adhesive properties of NBH can be used to simultaneously adhere to the
required members without using other adhesives, and in this way the time for producing the
speaker can be significantly reduced, and the cone shape There is an effect such that the time
from the molding with the one to the completion is about 14 or the like.
4. Brief description of the drawings. FIG. 1 is a schematic longitudinal sectional view showing an
example of a conventional cone-shaped speaker, FIG. 2 is the same frequency-sound pressure
level characteristic diagram, FIG. 3 an example of a conventional dome-shaped speaker It is a
longitudinal cross-sectional view which shows. 1 ... cone paper, 2 ... diaphragm <chamber) Patent
applicant's name · Trio Co., Ltd. EndPage: 2 years old 1 Fig. 2 Fig. 2 between KHz "iL Fig. 50.
Inventors other than the above 弐 1) Kunio EndPage: 3
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