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The present invention provides a high rigidity and light weight by forming the speaker
diaphragm from a ceramic material. Conventionally, as a diaphragm material for a speaker, a
paper sheet of pulp is mainly used for low-middle range regeneration such as woofer, and for
high-tone range reproduction such as tweeter, it has a specific elastic modulus (E / の). For
example, thin films of aluminum, titanium or the like, plastic films, moldings of fiber cloth, etc.
are used as the large metal 8 examples. However, the cone paper made from pulp papermaking
as a diaphragm for woofer has a low rigidity and a narrow regeneration zone. In addition,
although the metal diaphragm for tweeter has a large E / ρ, there is a drawback that mechanical
loss (tan δ) is small and flatness of frequency characteristics is difficult to obtain. The present
invention provides a speaker diaphragm in which the drawbacks of the conventional diaphragm
described above are improved, and a sheet formed by mixing the ceramic component at 80 to 1
ots and the cellulose pulp component at 20 to 10%. Is processed into a predetermined shape and
heated at C. or higher to burn off the cellulose pulp to obtain a diaphragm which is
lightweight, excellent in rigidity, and has a suitable tan .delta. The ceramic material used here is
light in weight, excellent in rigidity, and has a proper tan δ, and the cellulose pulp should be
able to be bent and cut to improve the processability to a predetermined shape. The mixing ratio
of the ceramic component to the cellulose pulp component is preferably in the range of 80 to
90% of the ceramic component. If it is less than 80 μm, the strength after firing will be small,
and if it is more than 90%, it will be difficult to obtain a diaphragm having a desired shape,
because it will be broken and it will lack workability such as cutting. The material mixed at the
above ratio has the same properties as general paper, and when processed into a predetermined
shape, it is easy to bend, cut, and bond easily, and so forth. In addition, mixing 1 to be fired after
being formed into the shape of a foot is necessary at 1200 ° C. or more. If the temperature is
less than 1200 ° C., the ceramic will not melt and it will not be a strong compact. Next, an
embodiment of the present invention will be described. [Example 1] A sheet material having a
thickness of 0.3 mm made of a mixture of ceramic component SSS and cellulose pulp is cut to a
size of 10 x X 15 st II and gradually heated to 1250 C in an electric furnace to burn out the
cellulose pulp The ceramic component was fired while producing a test piece. On the other hand,
as a comparative reference, a kraft pulp to be used was paper-made by the conventional
diaphragm for a speaker and cut to the same size as above to prepare a test piece.
If the specific elastic modulus E / な ら, the mechanical loss tan δ was determined by the
vibration lead method for the above two types of test pieces. The results are shown in Table 1. As
shown in Table 1 Table 1, it can be seen that the diaphragm material of Example 1 has an
appropriate tan δ at twice or more E / ρ greater than that of a diaphragm material made of a
conventional kraft valve. [Example 2] The same base as in Example 1 was used to process it into
a cone shape of 9 caliber 10CII, and it was subjected to the same baking process as that of
"Imperial Period" to produce a speaker diaphragm. Further, as a comparative reference, a
conventional kraft valve was paper-made to prepare a diaphragm for a cone-shaped speaker with
a diameter of 10 crIL. The sound pressure frequency characteristic is added to this selfoscillating plate, and the result is shown in the figure. As can be clearly seen from this figure, it
can be seen that the high frequency characteristic of the speaker can be expanded. As described
above, since the speaker diaphragm of the present invention is light in weight and excellent in
rigidity and has a moderate mechanical loss, it is possible to obtain an excellent one in sound
pressure frequency characteristics.
Brief description of the drawings
The figure is a sound pressure frequency characteristic diagram of a diaphragm made of a
diaphragm according to an embodiment of the present invention of a cone speaker of medium
diameter 1 oc IL and a conventional craft valve.
(Day p) γ <: v ′ ′ t ′ 1 −
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