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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing an embodiment
of a speaker according to the present invention, FIG. 2 is a cross-sectional view of a diaphragm
for use with the speaker (. FIG. 3 is an enlarged view of the main part 4 is a characteristic view
showing the relationship between the thickness of the anodic oxide film of the same diaphragm
and the specific elastic modulus, FIG. 5 is a sectional view of a diaphragm in another embodiment
in FIG. 6, FIG. 7 FIG. 8 is a cross-sectional view showing another embodiment of the force.
DESCRIPTION OF SYMBOLS 1 ... field part, 8, 18 ... diaphragm, 9.19 ... voice coil, 10 ... magnetic
gap, 13 ... aluminum, a aluminum board | substrate, 14 ... anodic oxide film.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a speaker using a
diaphragm having a high elastic modulus by forming an anodic oxide film on the surface of an
aluminum substrate. In general, the characteristic required for the moving plate used for
speakers is that the haWf degree be as small as possible. b. The elastic modulus is as large as
possible, and a internal loss is moderately large. Among them, a and b are considered to be
extremely important in making the propagation speed of imaging motion thicker. For this reason,
conventionally, high vibration materials such as carbon fiber, alumina fiber, etc. are used for 9
diaphragms, or beryllium, durarun, titanium. A diaphragm using a light metal such as aluminum
has been developed and used. These diaphragms have a small density at J1 or a relatively large
elastic modulus, and a high propagation velocity, but in any of them. It has been difficult to
obtain sufficiently satisfactory characteristics as it is restricted by the density and elastic
modulus of the material. The present invention eliminates the above-mentioned conventional
drawbacks. The present invention will be described with reference to FIGS. IIE1 to T of the
drawings. First, as shown in FIG. 1, it is t with respect to nine speakers using a dome-shaped
moving plate. Reference numeral 1 denotes a field section, which comprises a plate 3 provided
with a center pole 2 and a ring-shaped magnet 4. It is also constituted by a ring-shaped upper
plate 6. The field section 1 shown here is called an external magnet type, but a field magnet
section called an inner magnet type constructed by incorporating a columnar magnet or a
columnar magnet and a pole piece in W- It may be A dome-shaped diaphragm 8 is mounted on
the field section 1 via a ring 6.7, and a voice coil 9 is coupled to the dome-shaped diaphragm 8,
and the voice fill 9 company's field mentioned above The magnetic gap of Part 1 is 1 ° K
correctly. Furthermore, on the first moving plate 8, a large number of sound output holes are
provided, and the protective plate 11 is covered, and it is mounted on the field section 1 and held
by the frame 12. 4) As shown in FIG. 2, the above-mentioned diaphragm 8 is provided with a
crucible 11rK anodic oxide film 14 of an aluminum mini-ram substrate 18 in the speaker having
such a configuration. The anodized film 14 is a porous film, and the anodized film 14 is sealed
and its thickness is in the range of 20 to 90% with respect to the aluminum substrate 13. In
particular, when the anodic oxidation conditions of the aluminum substrate a were variously
examined, the behavior of the thickness and the specific elastic modulus of the anodic oxidation
coating 11 [4] were met as follows.
Anodization was performed using a 40 μm thick pure f99.9% aluminum substrate 13. The
conditions for the anodic oxidation are: 6 Ωt% of acid as electrolyte and the current density of
0.8 A / dm ′ ′, and the total electrolytic time is changed to control the thickness of the anodic
oxide film 14 to the aluminum substrate 18 shown in FIG. The specific modulus (elastic modulus
/ density W) at that time was determined. The result is as shown in FIG. 4. When the thickness of
the anodized film 14 is equal to or more than a certain value, the specific elastic modulus is
extremely large i. でき)6る。 From this result, the thickness of the anodized film 14 is suitably
in the range of 20 to 90% as compared with the thickness of the aluminum substrate 13. That is,
when the thickness is 20% or less, the thickness of the anodized film 14 is small, so that the
specific elastic modulus can not be increased sufficiently. It is well known that normal aluminum
forms a film when it is released in the air, but the oxide film in this case is a few A and there is no
effect described above, in this case the above ratio If it shows, it will be 1% or less. Further, if it is
90% or more, the whole as a whole becomes extremely flimsy, and the processability is worn and
deteriorated, resulting in poor practicality. Furthermore, most of the anodized films 141i and it
are porous films. Usually, there are a barrier type and a porous type as an oxide film of
aluminum, but as described above, a porous type is suitable for forming a thin 9 thick anodized
film. This porous type anodic oxide film is formed on the barrier layer film, grows in a hexagonal
column shape, has its central Kpm hole, is excellent in adsorptivity, and is easily contaminated. !
た。 It is not sufficient for corrosion resistance. For this reason, the porous fJlliI polar oxide skin
[114 is subjected to sealing treatment with water. Usually, this sealing treatment is carried out in
pressurized steam or immersed in boiling water to close micropores using Ajl, o, change in Ajl
206 · H 2 OK and volume increase. By this sealing treatment, the contamination prevention
effect, the improvement of the weather resistance, the improvement of the electrical insulation,
and the improvement of the hard plate can be measured. From this, by using the aluminum
substrate 13 on which the anodic oxidation coating 1i 114 is formed. The diaphragm 8 having a
large specific elastic modulus can be obtained, and by controlling the thickness of the anodized
film 14, the specific elastic 'a tube can be arbitrarily changed. Further, as shown in FIG. The
anodic oxide film 14 may be formed only on one side of the aluminum substrate 13. In this case,
the formability is more advantageous, and further, if the bobbin of the voice coil 9-) is made of
metal, it is transmitted from the bobbin 7 It is also possible to obtain a new effect that the Joule
heat of the voice coil 9 can be efficiently dissipated from the aluminum substrate 13.
Further, as shown in FIG. 6, a part of the anode compensation film 14 is thickened to stabilize the
characteristics of KL and Sbi katoshi so as to prevent the diaphragm 80 split resonance in the
thick part 16 of% grain. I can do it too. This thick portion 14 can be easily formed by masking
and anodizing. In the above embodiment, a loudspeaker using a dome-shaped diaphragm or its
imaging plate has been described. As shown in FIG. 7, a frame 16 is connected to the field section
1, and a cone-shaped diaphragm 18 is assembled with a gasket 1 at the periphery of the frame
16. A voice coil 19 is connected to the diaphragm 18 The voice coil 19 is supported by the
damper 20, and the speaker K of the configuration in which the dust cap 21 is attached on the
central part of the diaphragm 1B so that Similar effects can be obtained using a cone-shaped
vibration 118 obtained by applying the anodic oxide film 14 to the aluminum nitride 1N13 in
various forms described above. As mentioned above, the speaker of the present invention is
excellent in manufacturability. And, because a diaphragm plate metal with high specific elastic
modulus, high propagation speed, and excellent heat resistance, weather resistance, corrosion
resistance, and insulation is used, significant improvement in characteristics, stability in product
Jf surface, and aluminum It is advantageous in terms of the cost of putting it into use, can be
made excellent also in processability such as formability, and has a great practical value.
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