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TECHNICAL FIELD The present invention relates to a diaphragm for a speaker. 11 In general, as
the material of the speaker diaphragm, the density is as small as possible, the elastic modulus is
large, the vibration propagation speed is large, the reproduced sound pressure frequency band is
wide, and the internal loss is appropriately large. Etc. are necessary. Paper, resin, metal and the
like are used as a material for the diaphragm as a material that can satisfy these various
requirements. Although the materials of these diaphragms have their own characteristics, they
also have their own defects, so it is extremely rare that they are used alone to compensate for
their defects, and many of them are mixed with other materials. It is used as a body or complex.
In recent years, a speaker diaphragm has been developed in which a metal oxide such as alumina
AIO titania TiO 2 и 23 и 2 и r 02 is plasma sprayed onto the diaphragm substrate. Although these
metal oxides radiated to such a diaphragm substrate have high rigidity and show very excellent
physical property values as a single substance, they measure physical property values in a
composite with the diaphragm substrate after thermal spraying. The results are inferior to the
physical properties of single substance. For example, the physical properties of a titanium foil
provided with a coating layer by plasma spraying alumina Al2O3 are as shown in Table 1. As
shown in Table 1 Table 1, it can be seen that the thermal spraying of alumina onto a titanium foil
is significantly inferior in each physical property value to alumina alone. SUMMARY OF THE
INVENTION An object of the present invention is to provide a speaker diaphragm in which the
preferable physical property value as an imaging plate is further improved. The diaphragm for a
speaker according to the present invention is a metal obtained by thermally spraying a ceramic
selected from alumina, zirconia, or titania on the main surface of a metal substrate formed in a
diaphragm shape, for example, a cone shape to form a coating layer. It is a composite of a twolayer structure of a metal and a sintered body of a ceramic characterized in that a ceramic
laminate metal substrate is heat-treated at a high temperature. Below, an embodiment of the
present invention will be described based on the attached drawings. First, a 40 ?m titanium foil
molded into a cone-shaped diaphragm shape is degreased and cleaned, and abrasive powder is
sprayed on the surface to carry out a plast treatment to prepare a moving plate substrate of
titanium foil. Next, as shown in FIG. 1, alumina A I 203 powder is introduced from the inlet 3 of
the plasma spray apparatus 2, a working gas is introduced from the air outlet 4, and alumina is
applied to the diaphragm of titanium foil by the plasma spray apparatus. (1) Thermal spraying is
performed to form an alumina coating layer having a thickness of about 40 ?m. In addition, an
alumina coating layer having a thickness of about 35 to 45 ?m may be sprayed.
At this time, the diaphragm substrate is rotated so that alumina sprayed by thermal spraying
adheres uniformly to the surface of the imaging plate substrate 1. FIG. 2 is a partial crosssectional view showing a diaphragm 6 of a laminated structure formed of a composite of the
diaphragm substrate 1 of titanium foil and the alumina coating film 5 formed by thermal
spraying of alumina, which is made in this way. Next, as shown in FIG. 3, a laminated plate of
moving plate 6 in which alumina is sprayed by 40 ?m thickness on the formed 40 ?m thick
titanium film diaphragm substrate main surface is put in the vacuum heat treatment furnace 7.
Heat to a high temperature. The diaphragm 6 is held by a jig 8 in the vacuum heat treatment
furnace 7. Thereafter, the heat treatment is finished to obtain the speaker diaphragm of this
embodiment. In the heat treatment in this embodiment, after the temperature in the vacuum heat
treatment furnace reaches a predetermined heating temperature, that is, 800 to 1200 ░ C. at a
heating rate of 60 ░ C./hour, the predetermined heating temperature is maintained for 1 hour It
is performed by heating the diaphragm of a laminated structure. Table 2 shows physical values
of a diaphragm of a titanium foil substrate of 40 ?m-alumina sprayed by 40 ?m with a long
heating temperature. Table 2 also shows the physical property values of the diaphragm having a
laminated structure which has not been subjected to the non-heat treatment, as a comparison of
the diaphragm of the present embodiment and the conventional one. As shown in Table 2 and
Table 2, large differences in elastic modulus can be seen due to differences in heating
temperature. That is, it is understood that the elastic plate of the two-layer structure of the
titanium-alumina thermal spray has a larger elastic modulus as the heating temperature is
higher. This is because the crystal structure of alumina is transformed from the ? phase to the
? phase at the time of plasma spraying and further to the ? phase by heat treatment at high
temperature according to the present invention, whereby the elastic modulus of the diaphragm of
this embodiment is improved. Effects of the Invention As described above, according to the
present invention, a ceramic diaphragm is thermally sprayed at a high temperature after thermal
spraying of ceramics on a moving plate substrate of titanium foil, whereby a speaker diaphragm
having a high elastic modulus can be obtained. Furthermore, since the piston movement is
possible to the high range, the high frequency range divided vibration frequency is increased,
and the speaker diaphragm having the frequency characteristic in the audio frequency range
flattened is obtained.
Brief description of the drawings
FIG. 1 is a schematic cross-sectional view of a plasma spray apparatus, FIG. 2 is a partial crosssectional view of a speaker diaphragm of the present invention, and FIG. 3 is a schematic crosssectional view of a vacuum heating furnace.
Explanation of symbols of main parts 1 иии Diaphragm substrate 2 иии и и и Plasma spraying device 3
ииииииииииииииииииииииииииииииииииии Blower 5 и Alumina coated film 6 и и и и и и и и и и и и и и и и и и и и и и и и и и и и vacuum heat
treatment furnace 8 и и и и и и и и jig jig 7 Figure 2 2 43
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