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The present invention relates to a diaphragm for an electroacoustic transducer having high
elasticity and high loss. SUMMARY OF THE INVENTION The present invention is based on high
elastic alumina continuous fibers in a diaphragm of an electroacoustic transducer, and the fibers
are bonded and filled with a metal, an inorganic substance, an organic substance, or a mixture
thereof, A diaphragm with high elasticity and high loss is obtained. (Conventional problems and
problems to be solved by the invention) Conventionally, a speaker moving plate is made by
molding and processing plastic films, woven fabrics, metal plates, etc., or by paper forming of
natural fibers or synthetic fibers. Many are made. 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.
Carbon Il is chemically stable with respect to organic substances, but has weak adhesion to
organic substances, has a limit for added members, and can not obtain a sufficient combined
effect. In addition, metals such as aluminum have the disadvantage that sufficient composite
effects can not be obtained due to the formation of aluminum carbides at the joints when forming
at high temperatures, and the mechanical strength of this product is small. ing. SUMMARY OF
THE INVENTION It is an object of the present invention to eliminate these drawbacks and in
particular to provide an imaging plate with eight elasticity, high loss. The continuous alumina
fibers that can be used in the present invention have a weight ratio of Al 2 O 3 of 40? It contains
six or more, and those having the following physical properties can be used. Fiber diameter: 3 to
20 μm Weight: 2.6 to 3.9 pulling! ! JStrength II: 100 to 250 K (lL'11 m2 tensile modulus: 10 to
40 x 103 gf / mm2 inter-fiber bonding material includes light metals such as aluminum, and
inorganic materials include inorganic binders (trade name Cambe CF, LA: Kansai Paint Co., Ltd.) is
available. As the organic substance, epoxy resin, phenol resin, polypropylene resin, polyvinyl
chloride resin and the like can be used. Not only single metals of the above-mentioned metals,
inorganic substances and organic substances but also mixtures thereof can be used as the interfiber bonding and the plugging material. 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
1) The alumina continuous fiber used is Denka alumina long fiber (Denki Kagaku Kogyo Co., Ltd.
trade name), and I!
Miscellaneous animals are shown in Table 1. Table 1 shows the physical properties when a
unidirectional reinforced epoxy resin is produced from the first main fiber, glass fiber and carbon
fiber. The fiber blending amount at this time is 60% in volume fraction. Table 2 shows the
physical properties of unidirectionally reinforced aluminum made of the main fiber. The fiber
composition at this time is 50% in volume fraction. The present invention is preferably used as a
skin material of a flat plate diaphragm having a honeycomb core structure. EXAMPLE 2 A
continuous fiber of alumina having a tensile elastic modulus of 16 × 10 'at gf,' mm 2 and an I11
diameter of 1011 m was cut to a length of 0.5 to 1 mm, and added 35% by weight to heated
aluminum. As shown in FIG. 1, this mixture 1 is injected from the injection port 4 of the upper
mold 2 ° and the lower mold 3 and solidified by cooling. 5 is degassing. The physical properties
of the moving plate thus obtained, having a thickness of about 100 μl, obtained a tensile
strength of about 5 times and a tensile modulus of about 2 times that of 100% aluminum. (Effects
of the Invention) As in the case of the present invention, a diaphragm of high elasticity and high
loss is obtained by bonding and packing between fibers with metals, inorganic substances,
organic substances or a mixture thereof using alumina continuous fibers. You can get
Brief description of the drawings
FIG. 1 is an explanatory view showing a production state of the present invention.
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