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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
diaphragm for a speaker, and in particular, to reduce the weight and increase the rigidity thereof.
[Prior Art] FIG. 2 is a cross-sectional view showing a conventional speaker diaphragm, in which
(la) is formed in a porous layer by thermal spraying of a high melting point (2400 ° C.) material
such as B4C. Heartwood, (2a) is the impregnated material such as phenol or triazine which fills
the space of this heartwood [section I intend to solve the invention! Since the conventional
speaker diaphragm has a porous space formed in the core as described above, the bonding force
between the particles is weak and the rigidity is low. As a countermeasure, the above-mentioned
porous space is filled with the above-mentioned resin to increase the overall rigidity, but in this
case, there is a problem that the weight is increased accordingly. The present invention has been
made to solve the above-mentioned problems, and it is an object of the present invention to
obtain a lightweight and rigid speaker diaphragm. [Means for Solving the Problems] The speaker
diaphragm according to the present invention comprises a porous inner layer formed by thermal
spraying of a high melting point substance, and a lower melting point reinforced outer layer
formed on the surface of the porous inner layer. And have a three-layer structure. [Operation] Is
the speaker diaphragm in the present invention rigid? Since it is composed of a high reinforcing
outer layer and a porous inner layer which can be made porous, light in weight, and thick, it
becomes a speaker diaphragm having high rigidity and light in weight. An embodiment of the
present invention will be described below. That is, in FIG. 1, (1) is a porous inner layer formed by
thermal spraying of a substance having a relatively high melting point such as B4C, (2) is the
porous space, (3) is AI2 03, etc. It is a reinforced outer layer deposited and formed on the inner
and outer surfaces of the porous inner R9J (11 by the thermal spray having a melting point
lower than that of the constituent of the porous inner layer, and these are fired at about That is, since the porous inner layer (1) is small in rigidity but light in weight, the
thickness can be increased. On the other hand, since the reinforcing outer layer (3) has a lower
melting point, the bonding between particles by firing is large, and hence the rigidity is high, and
since these m (31 have a three-layer structure, it is lightweight as a whole and high in rigidity A
speaker diaphragm will be obtained. In the above example, Aβ 20 (melting point 2050 ° C.) is
used for (B 4 C (melting point 2400 ° C.). F 3 for 11), and the baking temperature of these is set
to about 2100 ° C. between the two melting points. In addition to enhancing the bonding
between the particles forming the reinforcing outer layer (3), the porous inner layer is considered
so as to maintain a sufficient space.
As mentioned above, although the combination of ceramics was shown as a porous-like inner
layer and a reinforcement outer layer in the said Example, you may use a metal, resin, etc. whose
melting | fusing point is lower than that, for example. [Effects of the Invention] Since the speaker
diaphragm of the present invention is configured as described above, it is lightweight and highly
rigid, whereby the reproduction frequency band is broadened, and a high-performance speaker
diaphragm can be obtained. It has the effect of
Brief description of the drawings
FIG. 1 is an enlarged sectional view showing a part of the speaker diaphragm of the present
invention, and FIG. 2 is an enlarged sectional view showing a part of a conventional speaker
In the figure, (11 is a porous inner layer, (2) is a space, and (3) is a reinforced outer layer. $ 1
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