close

Вход

Забыли?

вход по аккаунту

?

JPH02277399

код для вставкиСкачать
Patent Translate
Powered by EPO and Google
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
financial decisions, should not be based on machine-translation output.
DESCRIPTION JPH02277399
[0001]
FIELD OF THE INVENTION The present invention relates to microphones. (Prior Art) An
electrodynamic microphone has a diaphragm on its front portion configured to vibrate in
response to sound pressure received from a sound wave in a medium, a magnetic flux
distribution change detection coil fixed to the diaphragm, and And the magnetic flux distribution
change detection coil is integrally vibrated in response to the vibration of the diaphragm, and the
magnetic flux distribution change detection coil is formed on the rear surface of the diaphragm
in response to the vibration. By moving inside, the electric signal induced in the magnetic flux
distribution change detection coil is utilized in accordance with the change of the sound pressure.
In addition, the electrostatic microphone arranges a diaphragm biased to a high potential with a
special dedicated power supply in the electric field, and the diaphragm vibrates according to the
sound pressure received from the front surface of the diaphragm. It is something that changes
the 8 dragons. (Problems to be Solved by the Invention) In the electrodynamic microphone, the
mass distribution of the vibration system including the diaphragm is broken because the
magnetic flux distribution change detection coil is fixed to the diaphragm. The structure is
difficult to obtain sufficient physical performance, and therefore, there is a drawback that it lacks
the ability to accurately track sound pressure and it is difficult to obtain good microphone
characteristics. Electrostatic microphones have the disadvantage that they need to apply a high
potential bias to the diaphragm, which requires a special dedicated power supply for applying
the bias, which is inconvenient. The present invention is free from the above-mentioned
drawbacks of electrodynamic microphones and electrostatic microphones, that is, it has excellent
microphone characteristics by being able to accurately track sound pressure, and a special
dedicated power supply. The purpose is to provide an unnecessary microphone. (Means for
Solving the Problems) In order to achieve such an object, in the microphone of the present
invention, a diaphragm made of a superconducting material is disposed at a position receiving
05-05-2019
1
sound pressure on the front surface portion, and From a permanent magnet opposed to the rear
surface portion of the diaphragm with the magnetic flux distribution space interposed, and a
magnetic flux distribution change detection coil arranged in the magnetic flux distribution space
between the diaphragm and the permanent magnet It is characterized by becoming. (Operation)
According to the above configuration, the diaphragm is made of a superconducting material, so
that the diaphragm can not pass the magnetic flux due to the Meissner effect, which is an
inherent property of the superconducting material. For this reason, the magnetic flux from the
permanent magnet toward the rear surface of the diaphragm is repelled by the rear surface, but
the distribution of the magnetic flux due to the repulsion is dependent on the sound pressure
that the diaphragm receives on the front surface. It corresponds to the vibration state which
vibrates.
Therefore, when the diaphragm vibrates according to the sound pressure, the distribution state
of the magnetic flux from the permanent magnet changes, but the change is detected by the
magnetic flux distribution change detection coil and the magnetic flux distribution change
detection coil An electrical signal corresponding to the change in the distribution of the magnetic
flux is induced. Based on this electrical signal, it is possible to perform a micro-bon operation
corresponding to the sound wave received by the diaphragm. Embodiments of the present
invention will be described in detail with reference to the drawings. FIG. 1 is a schematic crosssectional view of a microphone according to an embodiment of the present invention. In the
microphone 1 of the present embodiment shown in FIG. 1, a diaphragm 2 is disposed at a
position where the curved portion 3 receives a sound pressure, and is a diaphragm made of, for
example, an yttrium-based superconducting material. 4 is a permanent magnet in which a
magnetic flux distribution space 6 is interposed with respect to the rear surface portion 5 of the
diaphragm 2 and in the present embodiment, the N pole side thereof is disposed oppositely; 7 is
between the diaphragm 2 and the permanent magnet 4 The magnetic flux distribution change
detection coil is disposed in the magnetic flux distribution space 6. A housing 8 accommodates
these, and a dustproof net 9 is attached to the front opening 10 of the housing. The operation
will be described with reference to FIGS. 2 and 3. Here, the broken lines shown in FIG. 2 and FIG.
3 indicate the magnetic flux output from the N pole of the permanent magnet 4, and the
diaphragm 2 is made of a superconducting material so that the rear surface of the diaphragm 2
is The state in which the magnetic flux is repelled in the portion 5 is shown, and the arrow in the
figure directed to FIG. 2 shows a state in which the sound pressure on the front surface portion
of the diaphragm 2 is high, and FIG. The direction indicates the state in which the sound pressure
on the front surface portion of the diaphragm 2 is low. First, when the sound pressure from the
front opening IO of the housing to the front portion 3 of the diaphragm 2 increases as shown by
the arrow direction in FIG. 2, the diaphragm 2 is pushed toward the permanent magnet 4 by the
sound pressure. Vibrate in the direction Then, in this vibration state, since the diaphragm 2 is
made of a superconducting material, the magnetic flux is repelled by the diaphragm 2 by the
Meisner effect, which is an inherent property of the superconducting material. The magnetic flux
05-05-2019
2
directed from the pole to the rear surface 5 of the diaphragm 2 is largely repelled by the rear
surface 5. As a result, the magnetic flux m which can pass through the magnetic flux distribution
change detection coil 7 in the magnetic flux distribution space 6 decreases as shown in FIG. The
magnetic flux distribution change detection coil 7 outputs an electrical signal according to the
decrease of the magnetic flux. Next, when the sound pressure to the front surface portion 3 of
the diaphragm 2 becomes small as shown by the arrow in FIG. 3, the diaphragm 2 vibrates in the
direction away from the permanent magnet 4.
Therefore, in this vibration state, the diaphragm 2 is made of the same superconducting material
as the above, and the magnetic flux is repelled to the diaphragm 2 by the Meissner effect, which
is an inherent property of the superconducting material. In this case, the amount of repulsion at
the rear surface 5 of the magnetic flux from the N pole of the permanent magnet 4 to the rear
surface 5 of the diaphragm 2 becomes smaller than in the case of FIG. The amount of magnetic
flux passing through the magnetic flux distribution change detection coil 7 is increased as shown
in FIG. Thereby, the magnetic flux distribution change detection coil 7 outputs an electric signal
according to the increase of the magnetic flux. Therefore, as apparent from the comparison of the
case of FIG. 2 and the case of FIG. 3, the electric signal output from the magnetic flux distribution
change detection coil 7 is far from the case where the diaphragm 2 approaches the permanent
magnet 4 It will differ from case to case, so that the electrical signal corresponds to the change in
sound pressure, so that the function as micro-bon is obtained. (Effects of the Invention) As is
apparent from the above description, according to the present invention, the electrodynamic
micropon and the electrostatic microphone do not have the disadvantages respectively, that is,
the accurate followability to the sound pressure can be obtained. Thus, it is possible to provide
good microphone characteristics and provide an unnecessary micro-pong of a special dedicated
power supply.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a schematic cross-sectional view of a microbon according to an embodiment of the
present invention, and FIGS. 2 and 3 are diagrams for explaining the operation of the microphone
of the embodiment, and FIG. When the sound pressure on the front surface portion of the
diaphragm is large, FIG. 3 is a view in the case where the sound pressure on the front surface
portion of the diaphragm of the microphone is small.
05-05-2019
3
1 · Microphone · 2 · · · Diaphragm · 3 · Front surface portion of the diaphragm 2 · · · · · · · · · · · · · · 2
rear surface portion of the diaphragm 2, 6 · magnetic flux distribution space, 7 flux change
detection coil Applicant's Sheep Co., Ltd.
05-05-2019
4
Документ
Категория
Без категории
Просмотров
0
Размер файла
11 Кб
Теги
jph02277399
1/--страниц
Пожаловаться на содержимое документа