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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker diaphragm for transmitting vibration into the atmosphere in a speaker for converting an
electrical signal into sound. [Prior Art] As characteristics required of a material for a diaphragm
for a speaker, it is required that the mass is small, the Young's modulus is large, and the loss of
internal ILi is moderately large. Is satisfactory, and +4 materials such as paper, resin, metal, etc.
have been used as the material of the diaphragm. Each of these +4 diaphragms has its own
features but also has its drawbacks, and it is extremely rare to be used in the form of @ -materials
to compensate for this defect, and in many cases other It is used as a mixture with lumber 1 and
as a mouth complex. In recent years, many have used carbon fiber obtained by carbonizing
acrylic fiber in a high temperature inert gas, but in the case of using L7 and using it as a chopped
fiber, it is mixed with a valve and made into paper 7 There is a vibrating plate or a vibrating plate
woven into a mesh shape, and impregnated with a thermosetting resin such as epoxy or the like 1, heating, addition of rt: l, and molding 7. [Problems to be Solved by the Invention] However, in
the above-mentioned diaphragm in which carbon 1A IE and balun ° are YIL formed, the carbon
fiber and the valve do not sufficiently combine G, and the excellent physical properties of the
carbon fiber are mixed. Doo (There was a defect that was hard to be exhibited in the binding. In
addition, carbon fiber woven into net [1 shape is impregnated with thermosetting f'l resin, and
heat-added [1 ′ ′ molded composite +1 needs about 40% resin content, There is a defect that is
largely dependent on the curing properties. OBJECTS OF THE INVENTION The present invention
is to eliminate the above-mentioned drawbacks of the conventional carbon fiber-containing
diaphragm, and by not using a thermosetting resin, it is not controlled by its curing physical
properties. And, by using ceramics, carbon fiber is buried to compensate for Young's modulus
and tensile compressive strength to improve mechanical and physical strength, thereby having
many features and at the same time being relatively free from defects of characteristics. The
purpose is to obtain a diaphragm. [Invention's (learned) Missed 1! 11 II: In order to achieve the
above-mentioned purpose, the summary is that a diaphragm is formed of carbon fiber and
ceramic, and the carbon fiber is buried in the ceramic. [Embodiments of the Invention] FIG. 1
shows an embodiment in which the present invention is woven in January 11 embedded in a
ceramic, FIG. 2 shows a method of manufacturing FIG. The figure will be described. In FIG. 1 and
FIG. 2, (-, 1 is l'-J, 1 plate of mold type, 2 is aluminum-AI, (') 3, jil-near 7, r 02, titania T I 02) ,
Murray l-3 / l!
Ceramics such as 203-2 SiO □, 3 carbon fibers ItH! It is the produced diaphragm material. FIGS.
3 and 4 show the molding apparatus, in which the molding die 4 is formed of a pair of) -'T- 'type
which sandwiches the vibrating J-th and the ground material 3 therebetween. A heating furnace
5 heats the molding die 4 with the diaphragm tp 3 interposed therebetween. The carbon fiber
used in this example has a fiber diameter of 5 to 10 microns, a specific gravity of 1.8, and a
tensile width of 250 to 400 kg / mm 2 and an elastic modulus of 25 to 40 x 10 'kg / scale 2. It
has the features of maintaining the mechanical strength as described above, having no change in
tensile strength and elastic modulus even in an oxidizing atmosphere under 11 high
temperatures, and having heat resistance. The carbon fiber is woven in a mesh shape to form the
diaphragm material 3. An alumina colloid solution is used as the ceramic 2, and after being
impregnated in the above-mentioned diaphragm material 3, it is air-dried, sandwiched between
the molding dies 4 and put in the heating furnace 5 and fired at 100 ° C. for 3 hours. Each
temperature is finally baked at 1100 ° C. for 3 hours. By this treatment, alumina becomes αalumina, and the diaphragm material 3 in which carbon fibers are woven is buried in the αalumina. The forming mold 4 is taken out of the heating furnace 5 and the formed diaphragm 1
is peeled off from the forming mold 4 and cooled. The diaphragm 1 manufactured in this manner
not only has the diaphragm material 3 impregnated with the ceramic 2 but also has a layer of the
ceramic 2 on both the front and back surfaces of the diaphragm material 3 as a core material,
The entire diaphragm 1 is a film without air leakage. As ceramics 2 used in the present invention,
there are No. J, chromia Cr2O3, magnesia MgO1 beryllia Red, silica SiO2, titanium carbide TiC1
boron carbide 134c, boron carbide SiC3 boron nitride Si3 N4 and the like. Also, carbon fibers can
be used as a non-woven fabric, and in this case, as a method of forming a composite with a
ceramic, it can be made a diaphragm in the same manner as in the above embodiment.
Furthermore, in the case where the carbon fiber is in the form of chopped fiber or whisker, the
carbon fiber is mixed in a colloidal solution or lamix solution, sufficiently stirred and stretched,
and then shaped and fired. Thus, a speaker river diaphragm can be obtained. [Effects of the
Invention] In the present invention, since carbon fibers are embedded in the ceramic as described
above, the brittleness of the ceramic alone is eliminated, and the tensile strength and modulus of
elasticity of the carbon fibers is a diaphragm.特性 の 向 を −1-1-1!
る。 And, since carbon fiber is impregnated with ceramic and fired to be integrated, it is possible
to exert the advantages of the carbon fiber as a composite material. Therefore, the divided
vibration of the diaphragm can be suppressed, and a speaker with good sound quality can be
provided with one.
Brief description of the drawings
1 is an enlarged sectional view of a part of an embodiment of the present invention, FIG. 2 is a
sectional view of the whole, FIG. 3 is a sectional view of a molding die, and FIG. 4 is a sectional
view of a heating furnace.
1 · · · Φ j 1 plate, 2 · · · ceramics, 3 · · · 振 carbon fiber + I + 4 Ji cattle ground, 4 · · · molds, 5 · · ·
furnace. Patent applicant Pioneer Corporation Figure 1 Figure 2 Figure 3