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FIELD OF THE INVENTION This invention relates to a beautiful titanium diaphragm with a
finished surface finish that is used in a speaker. Conventionally, processing of this type of
titanium facilitates plastic deformation when annealed to an appropriate degree, and particularly
in the foil state, it is often used for dome-shaped titanium diaphragms that require extremely thin
thin film. Used. Then, the formed titanium diaphragm is subjected to hot air oxidation processing
to produce an interference thin film on the surface, and a diaphragm colored in yellow is widely
used. <Problems to be Solved by the Invention> Therefore, the conventional diaphragms
subjected to the thermal air oxidation processing of this type do not undergo further oxidation to
the inside when the surface is oxidized to a certain extent, so comparison of the interference thin
films Although a film having a very pale yellow color can be formed, a relatively thick reddish
purple film is difficult to form, and the same color tone can not be obtained because it is difficult
to form a funnel. In general, the interference thin film develops an interference color and appears
in a thin film of 0.51 μs or less. Therefore, since only the yellow coloring process of the thinnest
interference thin film is realized, there is a problem that it is insufficient to be exposed on the
front surface like the diaphragm of the speaker and to maintain an excellent design. Then, in
order to solve this conventional subject, an object of the present invention is to provide an
electrolytic oxidation method and to provide a colored titanium diaphragm. <Means for Solving
the Nine Problems> The present invention for extending the object is described in detail. The
present invention is a titanium diaphragm colored by applying electrolytic oxidation. The present
invention is such an lII! Since titanium oxide is produced by electrolytic oxidation on the titanium
surface, the formed interference thin film can be colored, and the thickness of the interference
thin film depends on the voltage and processing time. By setting these processing conditions, the
desired surface color can be obtained freely and stably. Embodiments of the present invention
will be described below. In one embodiment of the present invention, a diaphragm substrate
obtained by applying a 20 μl-thick pure titanium foil to a dome-like surface by a conventional
processing method is dipped in a trichollen solution to degrease it. Then, after being rinsed with
water, it is immersed in a mixed Il bath of 1% hydrofluoric acid and 2.5% nitric acid, pickled, and
conditioned on the surface, in an electrolyte of phosphoric acid 25 B / lk, The electrolysis was
performed using the diaphragm substrate as an anode. Then, it was melted for 15 minutes at an
electrolytic voltage of 50 V, washed with water, washed with hot water, and dried to form a
yellow thin film. Next, a blue thin film was obtained with the same electrolyte solution at an
electrolysis voltage of 120 and a diaphragm having an gray-black appearance was obtained
similarly at an electrolysis voltage of 300 v.
However, all these diaphragms are attached to the electrode jig one by one, and it takes a lot of
time to remove them, which is complicated and not suitable for mass production. And, in the
same manner as described above, the titanium foil itself was electrolytically oxidized to obtain
yellow, blue and grayish black foils. Then, when these foils are drawn, for example, to a domeshaped diaphragm having an outer diameter of 25 z + yφ and a depth of 6.5 shoulders, the
yellow and blue foils are interference thin films, so that some corners are also formed without
abnormality. It was possible to obtain a sufficiently colored diaphragm with a beautifully colored
surface. However, since the grayish-black foil is a thick film which does not have an interference
color, it can not follow the elongation or bending of the substrate at the time of the abovementioned patterning, and a crack or peeling occurs. Therefore, titanium foil that has been
subjected to electrolytic oxidation processing as it is is in the form of a thin film that can follow
the elongation and bending of the substrate, that is, interference with several thousand! In the
state of the membrane, molding is possible. And since it can carry out electrolytic oxidation
processing as foil, homogeneous color development processing can be performed in large
quantities continuously. Although the embodiments which are considered to be representative of
the present invention have been described above, the present invention is not necessarily limited
to only the structure of these embodiments, and the present invention is provided with the 5r Ily
item and the object of the present invention. It can be suitably modified and implemented within
the range which achieves and has the effect mentioned below. <Effects of the Invention> As
already apparent from the above description, the present invention is not the hot air oxidation
method which has many color unevenness in the past and continuous color development is
difficult, but the interference miR by electrolytic oxidation of titanium foil. By forming and then
forming, it is possible to reveal various colors, beautiful and homogeneous, at low cost, without
color unevenness, on the surface of the diaphragm, and it is also a colored diaphragm excellent in
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