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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
diaphragm used for a speaker. [Prior art and its problems] The speaker diaphragm is required to
be light in weight, to have a large Young's modulus, to have a suitably large internal loss, etc. as
its characteristics, and as a material to satisfy these characteristics temporarily , Paper, resin,
metal, etc. Since these substrates alone have disadvantages, they are often used as a mixture or
composite with other materials. For example, in a diaphragm made of paper, glass fiber or
collagen mixed into pulp for paper making to improve heat resistance / moisture resistance, or
carbon fiber mixed to improve Young's modulus and heat resistance is there. A fiber reinforced
composite material moving plate is also known. For example, those obtained by plating carbon
fibers or those obtained by impregnating carbon fibers with a thermosetting resin are cured. In
addition, although alumina fibers and nitride fibers have been developed, the materials
themselves are expensive and can not be accepted in the general market, or the strength
deterioration at high temperatures is remarkable, so vibration is caused. There was a problem
that it was not familiar as a board. [Object of the Invention] The object of the present invention is
to overcome the problems of the above-mentioned conventional diaphragm and to provide a
speaker diaphragm capable of satisfying the required characteristics in a well-balanced manner.
This will be described specifically. FIG. 1 is a cross-sectional view of a speaker diaphragm 1
according to an embodiment (dome shape) of the present invention, and FIG. 2 is an enlarged
cross-sectional view of a portion A thereof. In FIG. 2, 2 is a network substrate made of woven and
knitted silicon carbide fibers, 3 is a ceramic layer formed on the surface and the back surface,
and the network substrate 2 is embedded in the ceramic layer 3 It is done. 3 and 4 are views for
explaining the method of manufacturing the speaker diaphragm of the present invention. In FIG.
3, IA is a diaphragm material made of a reticulated base material impregnated in advance with a
ceramic colloidal solution, and 4 is a pair of molds provided above and below it. In FIG. 4, IB is a
diaphragm material provisionally formed by the above-mentioned mold 4 and the whole is put
into the heating furnace 5 and sintered while being sandwiched from above and below by the
mold 4, and the mold is released It is post-cooled to obtain a speaker diaphragm as shown in FIG.
In the present invention, the silicon carbide fiber that governs the characteristics of the speaker
diaphragm has the following physical characteristics. Fiber diameter -10 to 12 μm Specific
gravity = 2.8 Tensile strength = 250 to 300 kg / + n "Elastic modulus = 20 x 103 kg / va2 Also,
as ceramics, alumina Aβ 203, zirconia ZrO 2, titania Ti 2 O 2, mullite 3A7!
203 2 Si 2 O 3, chromia Cr 2 O 3, magnesia MgO, beryllia BeO% silica SiO 2, titanium carbide T
iC% carbonized carbide 84 C 1 silicon carbide SiC and silicon nitride 5 i 3 f% L can be used. For
example, a colloidal solution of alumina is impregnated into a reticulated substrate made of
silicon carbide fibers, air-dried, pre-baked in a heating furnace at 100 ° C. for 3 hours, and then
the temperature is gradually raised to 1100 ° C. When sintered for 3 hours, .alpha.-alumina was
obtained as the ceramic layer 3, and the diaphragm made of the silicon carbide fiber network
substrate became lightweight and highly rigid. According to the speaker diaphragm of the
present invention having the above configuration, the following effects can be obtained. (2) Since
a reticulated base material made of woven and knitted silicon carbide fibers is used as the matrix
of the composite, the brittleness of the ceramic alone is eliminated, and the tensile strength and
elasticity of the silicon carbide fibers themselves are eliminated. The magnitude of the rate
improves the characteristics of the diaphragm. ■ Since the ceramic layer covers the surface and
the back of the mesh substrate and the mesh substrate is embedded in the ceramic layer, the
diaphragm as a whole forms a film without air leakage, and imaging with little division vibration
It can be a board.
Brief description of the drawings
1 is a cross-sectional view of a speaker diaphragm according to an embodiment of the present
invention, FIG. 2 is an enlarged cross-sectional view of part A of FIG. 1, FIG. 3 is a front view of a
mold and FIG. It is furnace sectional drawing.
DESCRIPTION OF SYMBOLS 1: .. Diaphragm for speakers, IA, IB ... Diaphragm raw material, 2 ...
Reticulated base material, 3 ... ceramic layer, 4 ... mold | die, 5 ... heating furnace. Patent applicant
Pioneer Corporation Figure 1 Figure 2 Figure 3 Figure 4 1 B-6 q
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