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JPS5741400

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JPS5741400
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of the main part of the
conventional speaker voice coil, FIG. 2 is a cross-sectional view of the main part of one
embodiment of the speaker voice coil of this invention, and FIG. FIG. 4 is a schematic view for
explaining the formation process of the anodized portion of the speaker voice coil, and FIG. 4 is a
cross-sectional view of the main part of another embodiment of the speaker voice coil according
to the present invention. 1 ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии Varnishes, 6 ииии иии
Aluminum remaining part, 7 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 oxide, 9 и и и и и и и и 10 и и и и и и и и и и и и и и и и и
... Aluminum surface, 12 ..... Barrier layer.
DETAILED DESCRIPTION OF THE INVENTION The invention relates to a voice coil VC of a buttype loudspeaker. FIG. 1 is a cross-sectional view taken along the line 2--9 of 9 parts of a
conventional C electrodynamic wheel coil. In FIG. 1, 1 is a bottle made of paper, a heat resistant
plastic film, a light metal foil or the like in a cylindrical shape. A coil 2 is wound around one end
of the mevin l. 2. Conductor with coil 2Fi high conductivity metal 3. Insulation contact 4. It is
comprised by the varnish 5. The conducting wire 3 is made of a sieve conductivity metal such as
copper, and the insulating contact 4 is formed around the conducting wire 3. The insulation Mai
4 is made of an organic insulation material such as polyester or polyimide. The varnish 5 is a
book made of an organic insulating material having heat resistance equivalent to that of the
insulating film 4. The speaker voice coil as shown in FIG. 1 generally comprises a pole piece
having an outer diameter slightly smaller than the inner diameter of the bin 1, and a yoke face
having an inner diameter slightly larger than the outer diameter of the coil 2. That the center of
the winding width of the coil 2 and the center of the #lk pole gap substantially coincide with
each other in the stationary state, and that the bin 1 or the coil 2 contacts the pole piece or the
yoke plate Instead, it is # & mounted by a support system part such as a damper or a spider
tooth so as to be movable. In the magnetic gear lug, a strong magnetic field generated from a
permanent magnet is present, and when current flows through the lead 3 of the coil 2, the
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interaction with the magnetic field generates a driving force in the coil 2. When an audio signal is
applied to the coil 2, a diaphragm, which is normally connected to one lake of the bin 1, is driven
to emit sound in the space. As described above, in the conventional speaker, the driving force
generated in the conductor 3 of the coil 2 is transmitted to the insulating covering 8 which is an
organic insulating material, the conductor 4 and the varnish 5 as a conductor 1 and to the
bobbin l. Because the organic insulating material becomes softened significantly at temperatures
of a hundred and tens of degrees, for example, with JIS type 2 and H type insulators due to
temperature rise, the coil 2 has a large electrical conductivity. When an input is applied and the
conductor 3 generates heat, the driving force to be transmitted is reduced, the linear relationship
with the acoustic output is no longer established, and there is a disadvantage that distortion is
easily generated. Furthermore, when the temperature rises, the organic insulating material being
used is irreversibly deteriorated, and the lead wire 3 can not be fixed to the regular position and
can not be wound, to the speaker There is also a disadvantage that the electrical input of the
circuit can only be allowed to a relatively low value.
This invention was made in order to eliminate the above-mentioned conventional defects, in
which the conventional thin-walled aluminum cylinder corresponding to the conventional bottle
is subjected to anodizing treatment partially penetrating the entire plate thickness. It is an object
of the present invention to provide a speaker coil which is high in heat resistance and can
thicken the allowable input as a speaker. An embodiment of the speaker chair according to the
present invention will be described below with reference to the drawings. FIG. 2 is a crosssectional view of the main part showing the configuration of the embodiment. In FIG. 2, the same
parts as in FIG. 1 will be described with the same reference numerals. In FIG. 2, the zabin 1 is a
bin which is connected to the support system parts and the diaphragm at a portion where the
thin cylindrical aluminum coil is not formed. Further, 2 is a coil formed by anodizing treatment.
Coil 2 is a conventional lead IIi! It comprises an aluminum remaining portion 6 corresponding to
3 and an anodized portion 7 formed so as to penetrate through the entire thickness of a thinwalled cylinder of aluminum. The formation process of such an anodic oxidation portion 7 is
explained as the third factor tL. That is, when aluminum is electrolyzed as an anode in an
electrolytic solution such as sulfuric acid, oxide 8 containing mostly anodic oxidation s7 on the
surface is adjacent to hole 9 formed in the central portion of oxide 8 It becomes a porous cell
structure with the boundary 10 of the oxide 8 and grows in the thickness direction of the original
aluminum in a form in which the oxidation reaction of aluminum proceeds in the barrier layer 12
between the hole 9 and the bottom surface and the aluminum surface 11 . Since the oxide 8Fi is
electrically insulating, if the anodized portion 7 penetrates the entire thickness of the plate, the
portion loses its conductivity and the anodization is terminated. The above is known to those
skilled in the art, and a resist may be applied and protected on the portion which is not anodized.
The remaining aluminum portion 6 in FIG. 2 is spatially spirally connected to form a single-layer
solenoid coil, and a lead wire is connected to portions corresponding to both ends of the solenoid
coil. L, as in the prior art, can act as a speaker voice coil. In the above-described embodiment, the
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case where the coil 2 is in the form of a single layer fenoid has been described. With this type, a
conventional coil can be made thinner than a coil wound around a bin, so the speaker can be a
coil that narrows the pole gear lag, and the coil 2 becomes large. Even if the thickness of the
yoke plate is increased, the weight reduction of the coil and the coil that can efficiently use the
magnetic energy are also contributed, and it is possible to obtain a highly efficient speaker. .
In addition, since it is easier to manufacture the speaker when the both ends of the general K
lead wire are drawn in the same direction, one of the lead wires is insulated by the insulation
planter 4 around the conducting wire 30 as shown in FIG. It is also possible to use the coil
formed of the aluminum residual portion 6 and the anodized portion 7 formed by anodizing
treatment as the first layer and winding it as the second layer coil and fix it with the same face as
conventional one . Furthermore, by using aluminum as a material, it is possible to simultaneously
form a cone-shaped or dome-shaped diaphragm integrally in the process of forming it into a thinwalled cylindrical shape, anodizing such a thing Thus, it is possible to obtain a coil, a bobbin, and
a diaphragm that are continuously formed. As described above, according to the speaker coil of
the present invention, the anodic oxidation portion formed by anodizing aluminum is selectively
generated as an electrical insulating material, and a part of the conventional bobbin is directly
coiled. Since the oxide of aluminum is a thermally stable inorganic insulating material, the heat
resistance is high, and the allowable input as a speaker can be increased.
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