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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
imaging plate for an electroacoustic transducer having high elasticity and high loss. SUMMARY
OF THE INVENTION In the diaphragm of an electroacoustic transducer, the present invention
relates to a bonded or woven material comprising an organic substance, an inorganic substance
or a mixture thereof, to a cross woven fabric comprising highly elastic inorganic continuous
fibers 111M and aromatic polyamide continuous fibers. By applying it, it is made to hang the
diaphragm of 8 elasticity and am loss cheaply. (Conventional problems and problems to be
solved by the invention) Conventionally, the speaker diaphragm is made by molding and
processing a plastic film ′ ′, a metal plate, a woven fabric, etc., or paper molding of natural Il
fibers and synthetic fibers Many are produced by processing. However, since these have small
elastic moduli, it was not possible to obtain good frequency characteristics. In order to improve
these, it has been attempted to improve the elasticity of the diaphragm by using glass fibers
having high elasticity, carbon 11li, and inorganic msi such as silicon carbide weave. However,
since these inorganic fibers have small internal loss, it is difficult to obtain good frequency
characteristics. On the other hand, a diaphragm using an aromatic polyamide fiber having an
elastic modulus smaller than that of inorganic fiber such as carbon fiber and silicon carbide fiber
but having an elasticity of 8 and a larger internal loss than that of glass fiber is also attempted.
However, since the aromatic polyamide fiber (DuPont trade name Kevlar 4911 vIi) has a lower
Young's modulus compared to carbon 1IIll and a heat resistant temperature is as low as 204 °
C., there is a defect that deformation easily occurs during heat molding. (Means for Solving the
Problems) The present invention has been proposed to eliminate the defects of 1 、, and it is
composed of a high heat-resistant high elastic inorganic fiber and an aromatic polyamide 1 1 III
& 6 to form a fiber, and the fiber is It is characterized in that an organic substance or an
inorganic substance is used to bond the layers, and its purpose is to provide a high-elasticity, 1%
loss diaphragm for safety. As inorganic fibers that can be used in the present invention, there are
^ elastic inorganic continuous fibers such as carbon fibers and alumina fibers. In addition, as the
aromatic polyamide fiber, heat-resistant continuous fiber such as an almond fiber (Kevlar 49) or
Nomex (trade name) manufactured by DuPont can be used. As an inter-fiber bonding material,
use an organic substance such as a phenol resin, an epoxy resin, an acrylic resin or an inorganic
binder (trade name Cambe CELA: made by lit West Paint Co., Ltd.) that can be cured at 150 ° C.
× 20 minutes You can also. As the fiber-to-fiber bond and the plugging material, not only the
above-mentioned organic substance and machine-free substance housing but also those obtained
by mixing fine powder graphite or the like in a synthetic resin can be used.
As a cross woven fabric to be a base material of the diaphragm, a fabric such as plain weave, twill
weave, satin weave, etc. can be used. It is also possible to change the physical properties by
changing the number of fibers implanted, the thickness of the yarn, the compounding ratio and
the like. Next, the present invention will be described in detail. The embodiment is merely an
example, and it goes without saying that various changes or improvements can be made without
departing from the spirit of the present invention. EXAMPLE A carbon fiber and an aromatic
polyamide fiber are used to form a cross woven fabric, which is used as a diaphragm base
material. The carbon fiber used is old-carbolon (Asahi-Nippon Force-Pon Fiber Co., Ltd. trade
name), and the aromatic polyamide ms is Aramid m (Kepler 49: DuPont trade name). The fiber
distribution used for the cross woven fabric is 50% of carbon fiber and 50% of aramid II. The
weave of the cross-woven fabric was a four-sheet satin weave. Table 1 shows the composition of
the used base material (II). The structure is as shown in FIG. 1, in which 1 indicates a carbon fiber
and 2 indicates aramid 5aei. The physical properties of carbon ra miscellaneous used in Table 1
are as shown in Table 2. The physical properties of the aramid fibers used in Table 2 and this are
as shown in Table 3. Table 3 Impregnation with the phenol resin in which the above-mentioned
base material was dissolved in methyl alcohol, after hot air drying 1 # i, heat and pressure for 5
seconds with a 250 ° C mold, molding into a shape of diameter 20 cm + diaphragm did. Next, an
ultraviolet-curable resin 5c-100 (trade name of Electric Chemical Industry Co., Ltd.) having a
viscosity of 5000 cps is applied to the surface of the molded substrate for the purpose of
reinforcing and sealing the substrate. Although it is necessary to rapidly cure the resin, this 5o100 cures with an irradiation energy of 6000 ° J (millidium), so when using a high pressure
mercury lamp, the irradiation time was completely cured in 20 seconds. FIG. 2 shows frequency
characteristics. In the figure, A is a papermaking diaphragm, and B is a diaphragm of the present
invention. From this characteristic, it is recognized that the present invention has excellent
characteristics especially in the high frequency range. (Effects of the Invention) As described
above, according to the present invention, a bonded Il fabric comprising organic material,
inorganic material, or a mixture of these is applied to an woven fabric made of elastic elastic
continuous fibers and aromatic polyamide fibers, and a filler is applied. By the high elasticity,
high loss, and sis &! A diaphragm with excellent Ii number characteristics can be hung.
Brief description of the drawings
FIG. 1 shows the structure of the diaphragm substrate, and FIG. 2 shows the frequency
1 · · · Carbon fiber · · · · · · · · · Aramid m 帷 Patent applicant Foster Electric Co., Ltd. Figure 1
Figure 2 J115 skin (Hz)
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