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DESCRIPTION JPS63248300

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DESCRIPTION JPS63248300
[0001]
[Industrial Field of Application] The present invention relates to a position-electric conversion
device, and provides a technology for realizing a speaker, a microphone, a pickup, a displacement
gauge, and the like with high performance. [Prior Art] Conventionally, displacement-electricity
conversion devices such as speakers and microphones are composed of magnets, diaphragms
(displacement plates), coils, etc., and use Fleming's law etc. to show the relationship between
magnetic field, motion and electromotive force Was used a lot. For example, the structure of the
speaker is: <Known and described, for example, in @waseda "General Electronic Components"
Morikita Publishing, pp. 588 to p. 589 (A 41). [A problem to be solved by the invention] As
shown in FIG. 1, the speaker as described above supplies a voice current to the coil 2 placed in
the magnetic field by the strong permanent magnet 1, thereby the coil and The diaphragm 3 in
close contact with this is vibrated. Although it is usual to use a permanent magnet for generating
the magnetic field, there is a limit to the strength of the magnetic field that can be generated by
the permanent magnet, and the leakage of magnetic field lines is also a problem. An object of the
present invention is to provide a method of generating a stronger magnetic field and providing a
more complete magnetic shield in such a displacement-electric conversion device using
magnetism. [Means for Solving the Problems] The above object is achieved by using a
superconducting magnet for generating a magnetic field and using a superconducting shield for
magnetic shielding. [Function co-superconducting wire has a zero electrical resistance when used
below the critical temperature, so if it is made into a coil, a permanent current will flow and it can
be used like a permanent magnet, and the superconducting plate is completely diamagnetic
When this is used as a magnetic sensor, it is possible to perform better magnetic shielding than
when using a conventional permalloy plate or the like. EXAMPLES The present invention will be
explained by the following examples. EXAMPLE 1 FIG. 2 shows a cross-sectional view of a
loudspeaker according to the present invention. This is an example in which a superconducting
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plate is used for the magnetic field. The periphery of the permanent magnet 1 is covered with a
superconductor 4 mainly composed of yttrium, barium and copper oxide, and the
superconductor 4 is cooled by a cooling vibro through a copper plate 5. Furthermore, the
periphery was covered with the heat insulating material 7. The voice coil 2 is disposed in such a
magnetic circuit, and thereby the diaphragm 3 is driven. In such a structure, the magnetic field
does not leak to the outside of the speaker, so that the disturbance to the external device can be
prevented and the magnetic field applied to the voice coil 2 can be increased. (Embodiment 2)
FIG. 3 is a view showing an embodiment of f52 according to the present invention, which is an
example using a magnetic field due to a permanent current flowing in a superconductor, instead
of permanent magnetism.
??????? It was set as the structure which cools the superconducting coil 8 which has
barium and copper oxide as a main component by a cooling vibro through the copper plate 5.
Both ends of the superconducting coil 8 were shorted to form a closed circuit. When a
permanent current is generated in the superconducting coil 8 by the induced electromotive force
from the outside after the superconducting coil 8 is brought into the superconducting state, a
magnetic field due to this permanent current is applied to the voice coil 2 placed inside the
superconducting coil. In such a structure, since a permanent magnetic field is used instead of a
permanent magnet, a magnetic field of 15,000 gauss or more, which is the limit of the magnetic
flux density of the permanent magnet, can be applied to the voice coil. (Embodiment 3) FIG. 4 is a
view showing a third embodiment according to the present invention. This is an example in
which a superconducting coil is connected to a diaphragm. The superconducting coil 9 mainly
composed of yttrium, barium and oxidized steel was connected to the diaphragm 3 so as to be
able to vibrate freely. The superconducting coil 9 was placed in a coil 10 through which an audio
current flows, and placed in a copper box 11 filled with neon gas. The copper box 11 is
configured to be cooled by a cooling vibrator. When a permanent current is generated in the
superconducting coil 9, the coil 9 acts as a permanent magnet, vibrates in accordance with the
audio current, and operates as a speaker. Since the voice coil 10 does not need to be vibrated in
the speaker having the above-described structure, there is an advantage that it is not necessary
to be compact and lightweight, and it is possible to use a wire that can withstand one current.
Although the embodiments of the speaker have been described above, the present invention can
also be applied to a microphone since a current is generated in the voice coil if vibration is given
to the diaphragm by voice or the like. It can also be used to pick up a record. (Embodiment 4)
FIG. 5 is a view showing a fourth embodiment of the present invention, in which a
superconducting coil is used to generate a gradient magnetic field of a high sensitivity
displacement meter. The gradient magnetic field is such that the strength of the magnetic field
increases or decreases along the longitudinal direction of the prober 13. A pair of
superconducting coils 12 and 12 'were made to face each other, and Hrl was placed in a copper
box 11 filled with neon gas. Copper mll is cooled by cooling vibro. A Hall element 14 connected
to the displacement prober 13 is disposed between a pair of superconducting coils 12 '12', and
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the prober 13 and the Hall element 14 can move in the direction of the arrow according to the
displacement of the object. It has a structure. After the superconducting coil 12.12 'was brought
into a superconducting state, permanent currents were applied so that 12 and 12' would
generate opposing magnetic fields.
With this structure, a gradient magnetic field is generated in the vicinity of the Hall element, and
a slight movement of the Hall element causes a large change in the magnetic field applied to the
Hall element, and the amount of movement is known from the output voltage of the Hall element.
it can. In such a displacement meter, the sensitivity can be changed according to the intensity of
the permanent current. [Effect of Occurrence] As apparent from the above embodiments,
according to the present invention, it is possible to improve the performance of the conventional
speaker, microphone, pickup, displacement meter and other displacement-light-air conversion
devices.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a cross-sectional view of a conventional speaker, and FIG.
3 and 4 are cross-sectional views of the speaker of the embodiment 3 of the present invention,
and FIG. 5 is a cross-sectional view of the high sensitivity displacement meter of the embodiment
4 of the present invention. DESCRIPTION OF SYMBOLS 1 ... Permanent magnet, 2, 10 ... Voice ir,
3 ... Diaphragm, 4 ... Superconductor, 5 ... Copper plate, 6 ... Cooling pipe. 7 иии Thermal insulator,
8, 9, 12.12 ? иииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии 13 19 3?4 Displacement gauge prober. 14:
Hall element. ??? ???
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