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JPH01106697

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DESCRIPTION JPH01106697
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
low magnetic leakage speaker system for use in CRT-based video equipment. A television
receiver corresponding to the prior art audio multiplex broadcasting and stereo broadcasting is
manufactured, and speakers are arranged on the left and right sides, and a slim cabinet is
arranged close to the CRT. Under such circumstances, when a normal speaker is used, the
electron emitted from the electron gun of the CRT is bent by its magnetic field generated by the
magnetic field generated by the speaker's field section, causing distortion of the screen or
deformation of the screen. Bleeding etc. occur. Therefore, in order to solve this problem,
conventionally, there has been a low magnetic leakage type speaker (for example, Japanese
Utility Model Publication No. 62-54343) in which a magnetic circuit is fixed to the inner bottom
surface of a deep drawing frame. Hereinafter, the above-described conventional low magnetic
leakage type speaker will be described with reference to the drawings. FIG. 2 is a half sectional
view of a conventional low magnetic leakage type speaker. In FIG. 2, 1 is a bottom plate, 2 is an
annular magnet, 3 is a top plate with a reed, and the bottom plate 1 and the top plate 3 form a
magnetic circuit 5 which sandwiches the annular magnet 2 to form an annular magnetic gap 4 .
Reference numeral 6 denotes a deep drawn frame whose bottom is a dog and made of a magnetic
material than the outer shape of the magnetic circuit, and a through hole 7 is formed on the
upper end side thereof. The back surface of the magnetic circuit 5 is formed on the inner bottom
surface of the deep draw diaphragm so as to form a housing 8. A voice coil bobbin 9 wound with
a whiss coil 10 is fixed to the top plate 3 via a damper 11 in order to suspend the voice coil 10 in
the magnetic gap 4. A diaphragm 12 has an inner peripheral portion fixed to the voice coil
bobbin 9 and an outer peripheral portion fixed to the frame 6 through an edge 13. Reference
numeral 14 denotes a dust cap for closing the hole in the inner peripheral portion of the
diaphragm 12. The operation of the conventional low magnetic leakage type speaker configured
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as described above will be described. Let the top plate 3 side of the annular magnet 2 that has
been temporarily magnetized be an N pole, and let the bottom plate 1 side be an S pole.
Therefore, the bottom surface and the side surface of the deep drawing frame 6 are magnetized
to the S pole. In this case, most of the magnetic flux flows from the top plate 3 through the
magnetic gap 4 to the bottom plate 1, but the remaining magnetic flux flows into the bottom or
side of the deep drawing frame 6. However, the magnetic flux leaking from the middle part of
some of the top plates is a low magnetic leakage type speaker six times through the through hole
7 provided on the upper end side of the deep draw frame and the entire surface thereof. In the
case of the current television silane receiver or the high-definition television receiver which is
susceptible to the influence of the leakage flux to flow into the back and side of the screen, color
bleeding and color shift are likely to occur. There are problems such as fixing far away and
requiring other measures against magnetic shielding.
The present invention has been made in view of the above problems, and provides a low
magnetic leakage type speaker that can be used even in a high definition television receiver.
Means for Solving the Problems To achieve this object, the low magnetic leakage speaker system
of the present invention forms a thin film of a superconducting material on the entire inner
surface of a speaker cabinet, as well as the diaphragm, dust cap and edge of the speaker. By
forming a thin film of superconducting material on the entire surface in the inner direction of the
cabinet, the entire magnetic circuit of the speaker is covered with the superconducting material.
Operation With this configuration, the leakage magnetic flux generated from the speaker's
magnetic circuit does not go outside due to the Meissner effect (the magnetic flux does not
penetrate inside the superconductor) of the superconducting material that wraps around the
entire circumference, so CRT etc. It does not affect the other devices magnetically. Embodiment
An embodiment of the present invention will be described with reference to the drawings. FIG. 1
is a schematic cross-sectional view of the low magnetic leakage speaker system of the present
invention. In FIG. 1, 16 is a bottom plate, 16 is an annular magnet, 17 is a top plate, and the
bottom plate 16 and the top plate 17 sandwich the annular magnet 16 to form a magnetic circuit
19 forming an annular magnetic gap 18. It becomes. A frame 20 and a voice coil 21 are fixed to
the frame 2 o via a damper 22 in order to suspend the voice coil 21 in the magnetic gap 18.
Reference numeral 23 denotes a diaphragm, and reference numeral 24 denotes a dust cap for
closing the hole in the inner peripheral portion of the diaphragm 23. An edge 16 is fixed at the
inner peripheral end to the outer peripheral end of the diaphragm 28 and is fixed at the outer
peripheral end to the inner periphery of the frame 2o, 26 is a cabinet, 27 is a superconducting
material formed on the entire inner surface of the cabinet 26, 28 is a vibration A
superconducting material 29 formed on the back surface of the plate is a superconducting
material formed on the entire surface of the back surface of the edge. The thickness of the
superconducting material is 6 μm, and the composition is composed of yttrium-barium-copper
oxide. The operation of the low magnetic leakage speaker system configured as described above
will be described. First, when the superconducting material 27.28.29 is cooled with liquid
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nitrogen and brought into a superconducting state near the liquid nitrogen temperature, the
leakage flux generated from the magnetic circuit 19 of the speaker is due to the Meissner effect
of the superconducting material 27 ° 28.29. The magnetic flux does not leak from the cabinet
26 to the outside because it does not enter the superconducting material. The manufacturing
method of the superconducting material is formed by a sputtering method, a vapor deposition
method, a coating method dissolved in an organic solvent or the like which is a usual method,
and the material thickness can be arbitrarily controlled.
The material thickness may be set such that the leakage magnetic field from the magnetic circuit
19 does not exceed the critical magnetic field according to the type of the superconducting
material. Effect of the Invention The present invention is a diaphragm inside of a speaker cabinet.
By forming a thin film of superconducting material inside the dust cap and the edge, the leakage
flux generated from the magnetic circuit of the speaker can be confined within the cabinet by the
Meissner effect of the superconducting material so that it does not go outside. It is possible to
realize an excellent low magnetic leakage speaker system. Further, the diaphragm shape is not
limited to the cone type, and the same effect can be obtained by the same configuration with a
flat type and a dome type.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a schematic cross-sectional view of a low magnetic leakage speaker system according to
an embodiment of the present invention, and FIG. 2 is a cross-sectional view of a conventional
low magnetic leakage speaker.
19 ······· Magnetic circuit, 2T, 2BL 29
·······································································································································································································
·········· Superconducting material; Name of agent Attorney Nakao Toshio 1 other 15---Bottom plate
16-Ring ring) j-net / 1-Top plate B · · · Ring m air gap I 9 ° "Magnetic circuit ff 1--Frame 21-poise coil n--damper ff1--one temporary m-plant a-cabinet E'1.28.29--one superconducting
material
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