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Address 〒 182 Tokyo Kofu-cho Kojima-shi No. 261-6 Chofu Co-Polus Room No. 205 (1) One
statement (2) drawing No. 1 [No. . (1977) 4.2. Japanese Patent Application To-// 7 7 / [[phase]
Application date 50. (197r) No! , / Request for examination not yet filed (3 pages in total) Office
serial number l
Speaker diaphragm
Detailed Description of the Invention The present invention relates to a diaphragm using a fiber
obtained by spinning and firing an organosilicon compound. The conventional speaker
diaphragm is a plastic film. A large number of fibers are used which are produced by molding
and processing a fiber cloth, a metal plate or the like, or a paper-making process of natural fibers
1 synthetic fibers. However, since these have small elastic moduli, it was not possible to obtain
good frequency characteristics. In order to improve this, it has been attempted to use a carbon
fiber with high elasticity to improve the elasticity of the diaphragm. Although carbon fibers are
chemically stable to organic substances, they have weak adhesion with organic fibers, and have a
limited amount of addition, and metals such as aluminum are sufficient at the time of molding at
high temperatures. Since the aluminum carbide layer is formed at the joint portion and the
mechanical strength of this product is small, it has a drawback that a sufficient combined effect
can not be returned. The invention aims to eliminate these drawbacks and in particular to
provide a diaphragm with high elasticity. That is, the fiber used in the present invention is a
continuous fiber having a diameter of about 15 microns formed by spinning and firing an
organosilicon compound, and this fiber is composed of ultrafine particles of β-silicon carbide
having a diameter of about 50A ′ ′. Since this fiber has an elastic modulus of 30,000 "/ = and
a specific gravity & 8, it is highly elastic and has a large specific elastic modulus (elastic modulus
/ specific gravity). The present invention is a vibrating plate as shown in FIG. 1 (= C2, as shown,
silicon carbide fiber (1) is bonded with an inorganic substance or an organic substance (2), and
the fibers are joined.
Speaker diaphragm
Next, the present invention will be described in detail. Silicon carbide fiber with a diameter of
about 15 microns and a length of 0.5 to 2 LJ and a degree C cut into two (two-heat melting,
injection from EndPage: 1 (5), cooling and solidification, (6) is outgassing) It is a mouth. The
properties of the diaphragm obtained in this way were as large as about 3.5 to about 5 times
greater in tensile strength and elastic modulus than those of 100% aluminum. This is because the
bonding strength between silicon carbide fiber and aluminum is high, and this fiber is carbon
fiber. It has been found that it is stable at high temperature (: relative to boron fibers). In the case
of using aluminum sheath: 30a 0.8102, when water is added, after several hours, C 2 reacts
violently to make it possible to strengthen (double bond) between the fibers. Next, when fibers
made of two organosilicon compounds are combined with a thermosetting resin to form a
diaphragm, the characteristic is a fine structure such as a molecular structure or a crystalline
state of a synthetic resin. It is determined by the molecular weight distribution and the like, the
fiber length diameter and content, and the surface treatment to be a surface bonding agent. It is
necessary to be covered with resin in a state in which the reinforcing fiber is loosened quickly
and has a sufficient fiber length. Aiding in this is the coupling agent, which not only promotes
bonding between the fibers and the polymer, but also prevents the fibers from being cut and
shortened during the mixing operation. is necessary. When a silane coupling agent such as
.gamma.-glycidoxypropyl trimethoxysilane is used for this fiber, S and C bond 81 on the fiber
surface react with the silane coupling agent to form S, -o-81 bond. It was found that the resins
used were each bound by a strong group of affinity. Next, the fibers of the organosilicon
compound having a thickness of about 15 microns and a length of about 21i121 are mixed with
a 1% aqueous solution of silane, air dried, and dried at 50 @ O to 1010. 100 parts of epoxy resin
(trade name Ebiko) 82 parts of DTA 8 parts of the fibers described above are compared with
those made of the same amount of carbon fiber, and the tensile shear strength 1 elastic modulus
is 20 to 20 Increased by 50%. In addition, it is as follows when the shear adhesive force at the
time of using unsaturated polyester resin and a polypropylene other than an epoxy resin is
compared. In order to prevent the flow of air, improve the conversion efficiency, and reduce the
strain, a visco-elastic material may be applied.
As in the case of the present invention (in accordance with the present invention (in the second
case, it is composed mainly of fibers formed by spinning and firing an organosilicon compound,
and the fibers are bonded with an inorganic substance or an organic substance) I can go down
the board.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partially enlarged view of a diaphragm of the
present invention, and FIG. 2 is a cross-sectional view of a mold. (5) 1 ... silicon carbide fiber, 2 ...
binder, 3 ... upper mold, 4 ... lower mold, 5 ... inlet, 6 ... gas vent patent applicant Foster 1 Co., Ltd.
Attorney Takayama Toshi, 'Hoh (t (' (6) EndPage: 2 憾 1 (笥 憾 2 46, other than the above
inventor's address Akizawa, Tokyo Miyazawa-cho 512 Foster Electric Inc. EndPage: 3
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