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The present invention relates to a method of producing a colored titanium diaphragm for a
speaker, and a method of producing a colored titanium diaphragm for a speaker comprising a
colored titanium foil provided with a thin colored layer by continuous annealing. (Prior Art) As is
well known, as a diaphragm used for a sound device, particularly a speaker as an electroacoustic
transducer, in order to make the divided vibration frequency of the diaphragm as high as
possible and to flatten the frequency characteristic over a wide band A lightweight, highly rigid
metal material such as aluminum or titanium is widely used as a diaphragm material. Moreover,
in recent years, it has been put to practical use to color the surfaces of these metal diaphragms to
use the decorative effect. As a diaphragm that is acoustically superior as well as such a
decoration, a layer of titanium nitride is formed on a titanium base material, for example, by a
sputtering method, an ion plating method, or a base material in high temperature nitrogen gas
There is a diaphragm which is formed by a method such as exposing, etc., and finishing its
appearance to a golden color to enhance the decorative effect. However, in the conventional
various methods described above, after annealing, they are press-formed and then colored, and in
the case of coloring, they are molded because the base material has a high temperature of about
500 to 950 ° C. It has been experienced that deformation occurs in the base material and poor
quality occurs. Moreover, in the gas nitriding method, the processing time is extremely long as 6
to 9 hours. Furthermore, in the method of processing by applying a voltage in vacuum, such as
sputtering method or ion plating method, the treatment effect differs depending on the curvature
of the base material, making it difficult to make the entire surface uniform color, There is a
drawback that it can not be processed. In all of these conventional methods, in terms of yield and
process increase, the cost is significantly increased as compared with the uncolored product, and
at present the use of only high-grade products is limited. By the way, in Japanese Patent
Publication No. 54-21088, a titanium foil is heated in an oxygen atmosphere and / or a nitrogen
atmosphere as a "diaphragm for speaker" to form an oxide layer of titanium or nitride of titanium
on the surface of the titanium foil. A speaker diaphragm formed by forming a coexistence layer of
a layer or a layer of titanium oxide and nitride is disclosed, however, a type of batch system
disclosed in the above publication is 10-20 minutes for processing. Also, the thickness of the
obtained colored layer is as thick as 1 to 3 μM. The continuous annealing treatment of titanium
or titanium alloy strip is already known in Japanese Patent Publication No. 58-37383. However,
in order to prevent the occurrence of wrinkles, it discloses a method for forming a hardened
layer on the surface and rather preventing coloring.
In other words, color development should be prevented as much as possible when performing
continuous annealing treatment in the past. Further, the processing object of the method
disclosed in the above-mentioned publication is also a titanium strip for a heat exchanger tube,
and nothing is clarified about the speaker diaphragm. SUMMARY OF THE INVENTION It is an
object of the present invention to provide an efficient, inexpensive method of manufacturing a
colored titanium diaphragm for a speaker having excellent acoustic characteristics. Another
object of the present invention is to provide a method of producing a colored titanium diaphragm
for a speaker, wherein the color can be arbitrarily selected and the decorative effect is
remarkable. (Means for Solving the Problems) The present inventors have sought to solve such
problems (as a result of repeated studies, they obtained the following findings. (1) In the case of a
titanium foil with a thin oxidized or nitrided film formed by performing a continuous annealing
process, coloration is possible. (2) The decorative effect can be sufficiently exhibited even with a
colored layer as thin as that found in a film formed by continuous annealing. (3) If the colored
layer is sufficiently thin, even if it is a hard coating such as an oxide layer or a nitride layer, its
adverse effect on the processability is hardly seen. The present invention has been made based
on such findings, and the place to be summarized is that after cold rolling, titanium foil is
continuously annealed to be colored, and a diaphragm is formed from the obtained colored
titanium foil It is a manufacturing method of the coloring titanium diaphragm for speakers
characterized by doing. The term "titanium foil" refers to a thin plate of pure titanium and a
titanium alloy, and generally has a thickness of about 100 to 10 microns. In order to form a
speaker diaphragm, for example, this is press-formed and assembled as a speaker dome l. The
continuous annealing process may be carried out by continuously passing a coil-shaped coldrolled titanium foil through an annealing furnace, or using a suitable conveyance means such as
a roll conveyor etc. The above-mentioned annealing furnace may be run continuously. Here,
according to a preferred embodiment of the present invention, the continuous annealing may be
performed under an atmosphere of an oxide and / or a nitride-forming mixed gas. The thickness
of the colored layer of the colored titanium foil may be defined in the range of 50 to 250
angstrom, for example, by performing the continuous annealing treatment at 500 ° C. to 850 °
C. for 0.5 to 6 minutes. Thus, according to the present invention, the following effects can be
seen. (Since 11 coloring and annealing are simultaneously performed, the material properties are
not changed, and the press formability is also secured.
(2) Since the coloring at the time of annealing treatment is used, distortion or the like does not
remain in the material as compared with the case of coloring in post-treatment. (3) Since the
continuous processing using a gas atmosphere, uniform processing conditions are achieved over
the entire product to be processed, and even if a large amount of processing is performed, the
uniformity is ensured. (4) Possible colors are: red, blue, red purple, purple, navy blue, black,
golden, and mixed red, blue, yellow, white, black five colors by adjusting gas atmosphere and
temperature All color developments are possible and their decorative application is dramatically
expanded. (Function) Next, specific embodiments of the present invention will be described in
more detail. First, according to the present invention, a diaphragm substrate made of titanium or
titanium alloy foil after cold rolling or titanium or titanium alloy foil previously formed into a
diaphragm shape after cold rolling is adjusted to a predetermined temperature and gas
atmosphere. This method is a method of manufacturing a colored titanium diaphragm for a
speaker, which is continuously annealed in the annealing furnace, and is further subjected to a
forming process as necessary to make the target color develop. The process is carried out
simultaneously with the conventional material annealing process and the coloring process, and
the uniformity of color is very excellent due to the continuous processing in the annealing
furnace in which the gas composition and temperature are adjusted, and there is no variation in
material internal quality. Table 1 shows an example of the combination of the gas composition
and the temperature of the annealing furnace. Table 1 (% by volume) The kind of coloring can be
easily selected by changing the atmosphere gas component, any color can be made, and the
decorative meaning of the diaphragm is more effectively exhibited. Generally, metal oxides and
nitrides have high hardness and a large specific elastic modulus, so if oxides and nitrides are
formed on the surface, processing such as press forming is difficult. However, according to the
present invention, since coloring is performed by continuous annealing, this is a short-time gas
coloring method in which the coexisting layer of oxidation and nitride is suppressed to about 50
to 250 angstroms, and therefore coloring is sufficiently thin. It became a layer, and deterioration
of workability was very slight, and it was confirmed to be within the press forming tolerance.
Next, the present invention will be described in detail. EXAMPLE A 25 μ-thick titanium foil
(Grade-1, 7P 28 C) was continuously vF colored and blunt-ended colored using the gas
composition atmosphere shown in Table 2 under annealing conditions set at 750 ° C. and a
predetermined speed. In the atmosphere of Table 2, when the coloring of the golden color is
performed and the characteristics of the inner quality of the titanium foil after the annealing are
evaluated, the Electen value is 6.0 s + s according to this example, while only the soot gas is used.
In the case of continuous annealing, that is, in the case where only annealing was performed
without coloring, the electen value was 7, 41, so in the case of the present invention, a soft
material quite similar to a simple annealing material is obtained. It can be understood that
Table 2 (Volume%) Example 2 In this example, the thickness and color of the colored layer of the
titanium alloy foil were changed by variously adjusting the atmosphere composition and
temperature in Example 1. The results are summarized in Table 3. In addition, the example by the
atmospheric coloring method was mentioned as a prior art example for comparison. As the
processing conditions, batch type heating processing conditions of 500 ° C. × 60 minutes were
adopted. Table 3 (unit; person) Next, the relationship between the thickness of the titanium alloy
foil and the electen value was examined, and the results are summarized in a graph in FIG. In the
figure, in the case of the conventional example, coloring was carried out by heating at 600 ° C.
for 20 minutes with a batch crucible according to the method described in Japanese Patent
Publication No. 54-21088. It can be seen that the deterioration of the processability is
remarkable. EXAMPLE 3 A diaphragm of a speaker was actually manufactured using each
colored titanium foil of the present invention example and the conventional example in Example
2, and subjected to an acoustic test. The example of the present invention is provided with a
golden colored layer of 66 angstrom thickness on the titanium foil thickness of 30 μm of
Example 2 while the thickness of 30 μm shown in FIG. 1 is shown as a comparative example. A
green titanium foil with 380 angstroms of the same golden colored layer was used. The test
results are shown graphically in FIG. In the figure, it is understood that the comparative example
shows the dotted line graph, and the solid line shows the example of the present invention.
(Effects of the Invention) As described in detail above, according to the present invention,
annealing and coloring can be continuously performed in the same step, and significant cost
reduction can be achieved. In addition, because of the gas atmosphere coloring, uniform and
always reproducible coloring is possible.
Brief description of the drawings
FIG. 1 is a graph showing the relationship between the (7) and the electen value of titanium foil;
and FIG. 2 is a graph showing the results of the examples.
Applicant: Nippon Stainless Steel Co., Ltd.
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