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JPH01114200

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DESCRIPTION JPH01114200
[0001]
TECHNICAL FIELD The present invention relates to a headphone to which the Meissner effect of
a superconducting material is applied. An electrodynamic type is generally used as a type of prior
art headphones. Hereinafter, the above-described headphones will be described. FIG. 2 shows the
structure of a conventional electrodynamic headphone. The voice coil 11 integrally formed with
the vibrating membrane 1 Q is a permanent magnet 12. プレート13. It is fixed in the
magnetic air gap of the magnetic circuit constituted by the yoke 14. The integrated diaphragm
10 and voice coil 11 are fixed to the housing 8 via a fixing frame 7. The rubber ring 6 improves
the feeling of attachment to the ear, and the protector 3 protects the vibrating membrane 1Q. A
terminal plate 9 connects the voice coil 11 and the lead wire 4 to each other. In the
electrodynamic headphone of such a configuration, when a current corresponding to an audio
signal or a music signal is supplied to the voice coil 11 through the lead wire 4, the current flows
in a direction crossing the magnetic flux in the magnetic gap. The vibrating membrane 1 o
generates a driving force according to Fleming's left-hand rule. However, in the above
configuration, the voice coil must be accurately fixed in the magnetic gap of the magnetic circuit,
the yield and productivity are poor, and the voice coil is in the magnetic gap. Because the
magnetic gap is fixed to the magnetic gap, there is a limit in narrowing the magnetic gap, and the
conversion efficiency can not be improved. SUMMARY OF THE INVENTION In view of the above
problems, the present invention controls a magnetic field in response to an audio signal or a
music signal to drive a vibrating film, and provides highly efficient headphone f: excellent in
productivity. Means for Solving the Problems In order to achieve this object, the headphone of
the present invention has a gap due to a Meissner effect between a vibrating film and an
electromagnet obtained by processing a taped superconducting material into a desired optimum
shape. The magnetic field generated by the electromagnet is controlled according to the audio
signal or the music signal, and the diaphragm is driven. Operation The superconducting material
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1
which is a diamagnetic body taped by this configuration is used as a vibrating film, and the
vibrating film is repelled by facing it to the electromagnet 0 This is called the Meissner effect,
and the repulsive force can be controlled by a magnetic field. The headphone of the present
invention is an application of this effect. Embodiment An embodiment of the present invention
will be described with reference to the drawings. FIG. 1 is a cross-sectional view showing the
configuration of a headphone according to an embodiment of the present invention.
In FIG. 1, 1 is a superconducting vibrating membrane (hereinafter referred to as a vibrating
membrane), filled with yttrium, barium, copper oxide ceramics in a copper alloy sheath material,
rolled and processed into a desired shape after being taped An electromagnet 02 is fixed in a
positional relationship facing the vibrating membrane 1 via a fixed frame 7 by an electromagnet.
A protector 3 protects the vibrating membrane 1. Reference numeral 4 is a lead wire for
transmitting a signal for controlling the magnetic field. The reference numeral 5 denotes a
superconducting imaging ring (hereinafter referred to as a diaphragm ring), which is tensed by
the diaphragm 1f. It is. The numeral 6 is a rubber ring to improve the feeling of wearing on the
ear. The reference numeral 8 denotes a housing that protects and integrates each used part, and
the reference numeral 9 denotes a terminal board, which connects the electromagnet 2 and the
lead wire. ここでプロテクタ3. Lead wire 4 ° rubber ring e1 fixing frame 7. ハウジング8.
The terminal plate 9 is the same as that used in the conventional example. The drive method of
the headphone configured as described above will be described. It is well known that a magnetic
field H is generated when a current corresponding to a music signal or an audio signal is led to
the electromagnet 2 through the lead wire 4 and the terminal plate 9. Therefore, as a matter of
course, magnetic flux in a unit area, that is, magnetic flux density B is generated. If the vibrating
film 1 cooled by liquid nitrogen is disposed so as to be orthogonal to the magnetic field H, the
vibrating film 1 and the electromagnet 2 repel each other by the Meissner effect. It is well known
that the repulsive force at this time is proportional to the current flowing through the
electromagnet 2, so that when current corresponding to the audio signal or music signal is
supplied to the electromagnet 2, the diaphragm 1 also becomes an audio signal or music signal
Will be displaced in response to The stiffness of the vibrating membrane 1 may be reduced to
increase the displacement, and the corrugation may be provided on the surface less affected by
the direct magnetic field without facing the electromagnet 2. According to the present invention,
a vibrating film obtained by processing a taped superconducting material into a desired optimum
shape and an electromagnet are disposed to face each other with a gap by the Meissner effect,
and a magnetic field formed by the electromagnet The voice coil is not required to be accurately
fixed in the magnetic gap of the magnetic circuit as in the conventional example by controlling
the signal according to the voice signal or the music signal and driving the vibrating film as in
the conventional example. Do. Furthermore, since the voice coil is not fixed in the magnetic gap,
the conversion efficiency can be enhanced.
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2
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a cross-sectional view showing the configuration of a headphone according to an
embodiment of the present invention, and FIG. 2 is a cross-sectional view showing a conventional
headphone configuration.
1 ...... superconducting Todomaku, 2 ...... electromagnets, 1o ...... vibrating membrane, 11 ...... voice
coil, 12 ...... permanent magnet .
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