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JPH02257799

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DESCRIPTION JPH02257799
[0001]
The present invention relates to a diaphragm of a speaker and a voice coil bobbin. (B) Prior Art:
Problems to be Solved by the Invention Conventionally, as a diaphragm of a speaker in which an
oxide film layer is formed on at least one surface of a diaphragm base, for example, as shown in
FIG. Speaker diaphragms are known. In the figure, 13 is a diaphragm, 14 is a diaphragm
substrate of aluminum, 14a is an oxide film layer of aluminum oxide (eight λ 203) formed on
the front and back surfaces of the diaphragm substrate 14, and this oxide film layer 14a Is
formed using an anodic oxidation method. Chromic acid, sulfuric acid, and oxalic acid are mainly
used as an oxidation solution in the anodic oxidation method, and the diaphragm substrate 14 of
aluminum is connected to the anode for electrolysis, and an oxide film layer 14 a is formed on
the surface of the diaphragm substrate 14. Aluminum oxide (A11. □ 03) to precipitate. And since
the surface of the above-mentioned oxide film layer + 4a of aluminum oxide is porous, sealing
treatment is performed or a colored one is used as the diaphragm 13. However, although the
surface hardness of the diaphragm 13 is increased and the internal loss is increased because the
surface is porous (porous), a satisfactory value can not be obtained in the density and Young's
modulus which are important as the performance of the diaphragm 13. There was a drawback of
that. Table 1 shows each acoustic constant of aluminum foil and aluminum oxide. Also, as a voice
coil of a speaker, a voice coil using, for example, aluminum or titanium is also known, but an
eddy current is generated in the bass region, and this eddy current damps the amplitude to
deteriorate frequency characteristics. There was a problem that. A voice coil bobbin made of a
polyimide film or an organic resin film of glass fiber reinforced polyimide does not have the
above-mentioned drawbacks, but has a disadvantage that the speed of sound is inferior to that of
metal. This invention was made in view of the above-mentioned point, and the place made into
the purpose is the moving picture board of the speaker which improved the appearance and
performance by applying the anodic oxidation method to the diaphragm base material of
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1
titanium. It is an object of the present invention to provide a voice coil bobbin of an excellent
speaker of sound velocity which can provide high elasticity and high internal loss. (Iii) Means for
Solving the Problem The diaphragm of the speaker according to the present invention is a
diaphragm of a speaker in which an oxide film layer is formed on at least one surface of the
diaphragm base, wherein titanium is used as the base of the diaphragm. An oxide film layer of
titanium oxide (TiO □) is formed on at least one side of the substrate.
In the voice coil bobbin of the present invention, titanium is used as a base material of the voice
coil bobbin, and an oxide film layer of titanium oxide (TiO2) is formed on at least one side of the
base material. Also, the imaging plate and the voice coil bobbin may be integrally formed. (D)
Function According to the diaphragm of the speaker of the present invention, in the diaphragm
of the speaker in which the oxide film layer is formed on at least one surface of the diaphragm
base, titanium is used as the base of the diaphragm; Since an oxide film layer of titanium oxide
(TiO □) is formed on at least one side, hardness is increased, corrosion resistance, weather
resistance is improved, and diaphragms of various color tones can be obtained. Further,
according to the voice coil bobbin of the speaker of the present invention, titanium is used as a
base material of the voice coil bobbin, and an oxide film layer of titanium oxide (TiO □) is formed
on at least one side of the base material. A voice coil bobbin with high internal loss can be
obtained. (E) Embodiment An embodiment of a diaphragm and a voice coil bobbin of a speaker
according to the present invention will be described based on FIGS. 1 to 3. FIG. Example 1 FIGS. 1
(a) and 1 (b) are cross-sectional views of a diaphragm of a speaker in which a voice coil is
integrally formed, and FIG. 2 is an anodic oxidation method for forming an oxide film layer on a
diaphragm substrate. It is a block diagram which shows the principle of. In the figure, 1 is a
diaphragm of a speaker, 2 is a voice coil bobbin integrally formed with the diaphragm 1, 3 is a
voice coil wound around the voice coil bobbin 2, and 4 is a titanium base material of the
diaphragm 1 and the voice coil bobbin 2. 4a is an oxide film layer of titanium oxide (Ti (h))
obtained by anodic oxidation on the base material 4 of titanium. In the anodic oxidation method,
as shown in FIG. 2, the container 5 is diluted with phosphoric acid () 13 PO 4), which is the acidic
solution 6, to a concentration of 3 to 15%. Then, aluminum (1) 7 is used as a cathode, and the
diaphragm base 4 of titanium is used as an anode, and a DC power supply 9 is connected to these
electrodes to form an oxide film layer 4a on the surface of titanium diaphragm base 4 To
precipitate titanium oxide (TiO 2). The film thickness of the oxide film layer 4a of titanium oxide
is proportional to the current density (1) and the processing time, and when the film thickness is
200 to 2000 angstrom, various colors due to interference can be obtained by the film thickness
and the refractive index . For example, brown is obtained at 200 angstroms, yellow at 800
angstroms, green at 1300 angstroms, pink at 1800 angstroms and gray at 3 to 10 microns.
Titanium oxide (TiO □), also called titania, is a type of ceramic with mechanical properties with a
density of 4.24 and a Young's modulus of 2 x] 06 kg / cm 2, so it has no electrical conductivity
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and has insulating properties. There is. Tables 2 to 5 show the acoustic constants of the speaker
diaphragm and the titanium foil according to the anodic oxidation method. Table 2 (interference
color) Table 3 (gray) Table 4 (gray) Table 5 It should be noted that if the surface of the oxide film
layer 4a is sealed, the weather resistance and the acoustic characteristics are further improved.
(Embodiment 2) FIG. 3 shows a second embodiment of the present invention, FIG. 3 (a) is a
perspective view of a voice coil bobbin, and FIG. 3 (b) is a sectional view of the voice coil bobbin.
In the figure, 10 is a voice coil bobbin, 11 is a voice coil wound around a voice coil bobbin IO, 12
is a base made of titanium of the voice coil bobbin IO, 12a is a titanium oxide obtained by
anodizing on a titanium base 12 It is an oxide film layer of (Ti02). When the acidic solution 6
used in the anodic oxidation method is made into an electrolyte containing nitrogen, a titanium
nitride (TiN) coating layer is obtained on the surface of the titanium base 12a. Then, if this
surface is sealed with an inorganic material such as alumina or silica, a voice coil bobbin 10 with
good sound quality can be obtained. (E) Effects of the Invention The present invention is
configured as described above, so claim 1 has the following effects. ■ The surface of the
diaphragm becomes ceramic, and the Vickers hardness rises to 1000 kg / mm 2. ■ Corrosion
resistance and weather resistance become good. (1) A diaphragm or center cap of various colors
can be obtained. (2) The acoustic constant is improved compared to that of a diaphragm
substrate made of aluminum. The improvement of the acoustic constant improves the
characteristics of the high range of the speaker, thus improving the sound quality. (1) Since it is
not necessary to use a special device, and a large amount of processing can be performed
simultaneously, an inexpensive speaker diaphragm can be obtained. In claim 2, the following
effects can be obtained. ■ The surface of the voice coil bobbin becomes ceramic, and the Vickers
hardness rises to 1000 kg / [11 m 2]. ■ Electrical insulation rises. ■ There is no influence of
eddy currents. ■ Corrosion resistance and weather resistance become good. ■ High modulus,
high internal loss can be obtained.
[0002]
Brief description of the drawings
[0003]
1 to 3 show an embodiment of a diaphragm and a voice coil of a speaker according to the
present invention, and FIG. 1 (a) is a sectional view of a diaphragm integrally formed with a voice
coil, FIG. 2 is a block diagram showing the principle of the anodic oxidation method, FIG. 3 (a) is
a perspective view of the voice coil bobbin, and FIG. 3 (b) is an enlarged cross section of the voice
coil bobbin. is there.
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FIG. 4 is a cross-sectional view of a diaphragm showing a conventional embodiment. Main code
explanation 1: Speaker diaphragm 2.10: voice coil bobbin 4.12: base material of titanium
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