close

Вход

Забыли?

вход по аккаунту

?

JPH10145892

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 JPH10145892
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
giant magnetostrictive actuator for expanding and contracting a giant magnetostrictive rod by a
magnetic field formed by a magnetic field generating coil and transmitting the displacement to
the outside of a housing, and a giant magnetostrictive speaker using the same.
[0002]
2. Description of the Related Art A giant magnetostrictive material has the advantage of
generating a large displacement of as much as 1500 to 2000 ppm in the magnetic field direction
in a magnetic field, generating a large stress, having a high response speed, and being able to
drive at low voltage. Recently, attention has been focused on an actuator that converts an amount
of electricity into a mechanical amount or converts an amount of mechanical into an electric
amount. FIG. 2 shows a conventional giant magnetostrictive speaker using this giant
magnetostrictive actuator as an audio current-mechanical vibration converter, wherein one end
22a is in contact with the inner bottom 21a of the yoke 21 and the other end is free end 22b. A
giant magnetostrictive rod 22 and a magnetic field generating coil 23 for forming a magnetic
field corresponding to the audio current in the axial direction of the rod 22 are disposed in the
housing 21 and at the free end 22b of the giant magnetostrictive rod 22. The diaphragm 24
serving as the sound radiating portion is fixed, and the giant magnetostrictive rod 22 is expanded
and contracted by the magnetic field generated by the magnetic field generating coil 23, and the
displacement corresponding to the sound signal is fixed to the free end 22b. It is designed to be
transmitted and converted into speech.
04-05-2019
1
[0003]
However, in this type of speaker, the free end 22b side is slidably supported by the opening 21b
of the housing 21 so that rattling does not occur when the giant magnetostrictive rod 22
expands and contracts. When the giant magnetostrictive rod 22 stretches and contracts, the
sliding noise is transmitted to the diaphragm 24 through the giant magnetostrictive rod 22 so
that annoying noise is generated, and further, the sliding is caused. There is a fatal problem for
audio equipment in which the resistance changes due to various external factors. In addition,
when using a giant magnetostrictive actuator for applications other than speakers, it is not so
serious, but noise may occur during expansion and contraction, or physical dynamic friction
resistance due to sliding may change depending on the application. The problem remains.
Therefore, it is a technical object of the present invention to prevent such a sliding problem when
the giant magnetostrictive rod is expanded and contracted.
[0004]
SUMMARY OF THE INVENTION In order to solve this problem, the present invention provides a
rod-shaped giant magnetostrictive rod having one end formed at a fixed end and the other end
formed at a free end in a housing. A super magnetostrictive actuator comprising: a magnetic field
generating coil for forming a magnetic field in the axial direction of the rod, wherein the super
magnetostrictive rod is expanded and contracted by the magnetic field formed by the magnetic
field generating coil to transmit the displacement to the outside of the housing. At the free end of
the magnetostrictive rod, an actuator rod for transmitting the displacement to the outside of the
housing is connected, and a driving rod is formed by the giant magnetostrictive rod and the
actuator rod, and the driving rod is the actuator rod in the axial direction A plurality of leaf
springs provided at predetermined intervals along the core, and when the giant magnetostrictive
rod expands and contracts, no space slides in the space of the housing Wherein said that
suspended by the plate spring so as to be displaced by state.
[0005]
According to the present invention, when an electric signal is supplied to the magnetic field
generating coil, a magnetic field is formed in the axial direction of the giant magnetostrictive rod
according to the electric signal, and the giant magnetostrictive rod expands and contracts
according to the change of the magnetic field. The end is displaced and the displacement is
transmitted out of the housing via the actuator rod.
04-05-2019
2
At this time, the drive rod formed by connecting the giant magnetostrictive rod and the actuator
rod is penetrated through a plurality of plate springs in which the actuator rod is disposed at
predetermined intervals along the axial direction, and the giant magnetostrictive rod is expanded
and contracted. Since it is suspended by each of the plate springs so as to displace in the space of
the housing in a non-sliding state when doing, there is no inconvenience caused by sliding with
the housing and the magnetic field generating coil.
[0006]
BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be
specifically described below with reference to the drawings. FIG. 1 is a cross-sectional view
showing a giant magnetostrictive speaker using the giant magnetostrictive actuator according to
the present invention.
[0007]
The giant magnetostrictive speaker 1 of this example uses the giant magnetostrictive actuator 2
in the conversion unit that converts audio current into mechanical vibration, and the giant
magnetostrictive actuator 2 is a supermagnetostrictive actuator 2 formed of a giant
magnetostrictive material in the housing 3. A magnetic field generating coil 5 for forming a
magnetic field in the axial direction of the rod 4 around the magnetostrictive rod 4 is disposed
with a predetermined clearance with respect to the giant magnetostrictive rod 4, and further
around the same. A bias magnetic field generating magnet 6 for applying a bias magnetic field to
the giant magnetostrictive rod 4 is disposed. The giant magnetostrictive rod 4 is made of, for
example, a giant magnetostrictive material such as ETREMA Terfenol-D (registered trademark)
mainly composed of Tb 0.28 -Dy 0.72 -Fe 1.92, and its dimensions are, for example, 6 mm in
diameter x 50 mm in length. It is selected.
[0008]
One end of each of the giant magnetostrictive rod 4, the magnetic field generating coil 5 and the
bias magnetic field generating magnet 6 is supported by the disk shaped yoke 7, and one end
side of the giant magnetostrictive rod 4 is in the axial direction by the disk shaped yoke. The
04-05-2019
3
fixed end 4a is immovable. Further, the other end of the magnetic field generating coil 5 and the
bias magnetic field generating magnet 6 is supported by the annular yoke 8, and the other end
side of the super magnetostrictive rod 4 is fixed to the annular yoke 8. The movable yoke 9
disposed at the center of the housing is connected at the clearance of the two to form an axially
movable free end 4b. The giant magnetostrictive rod 4, the bias magnetic field generating
magnet 6, the disk yoke 7, the annular yoke 8, and the movable yoke 9 form a closed magnetic
circuit structure.
[0009]
Further, an actuator rod 10 is integrally connected to the free end 4 b of the giant
magnetostrictive rod 4 via the movable yoke 9, and a drive rod 11 is formed by the giant
magnetostrictive rod 4, the movable yoke 9 and the actuator rod 10. , And the displacement of
the free end 4b when the giant magnetostrictive rod 4 expands and contracts is transmitted to
the tip of the drive rod 11. Then, on the tip of the drive rod 11, the diaphragm 12 serving as a
sound emitting unit for converting mechanical vibration of the giant magnetostrictive rod 4
generated by the magnetic field change of the magnetic generating coil 5 into sound is fixed via
the mounting disk 12a. Thus, the giant magnetostrictive speaker 1 is formed.
[0010]
Further, an outer cylinder 15 is mounted on the housing 3 of the giant magnetostrictive actuator
2 for supporting the actuator rod 10 projecting from the giant magnetostrictive actuator 2
through the disc springs 13 and 14. The drive rod 11 is inserted through the two disk-shaped
springs 13 and 14 in which the actuator rod 10 is disposed at a predetermined distance along
the axial direction, and the giant magnetostrictive rod 4 is expanded and contracted. When the
drive rod 11 maintains a predetermined clearance between the giant magnetostrictive rod 4 and
the magnetic field generating coil 5 and between the movable yoke 9 and the annular yoke 8 in
the axial direction, the housing 3 The respective leaf springs 13 and 14 are suspended so as to
displace in the space of the above in a non-sliding manner. The disk-shaped spring 13 for
supporting the tip end side of the drive rod 11 is formed of, for example, phosphor bronze
having a thickness of about 2 mm and a diameter of about 60 mm, and a bolt portion formed at
the tip of the actuator rod 10 at its center. 10a is penetrated and fixed by a nut 10b screwed to
the bolt portion 10a, and a rim 16a is formed on a rim of a prestress adjustment screw 16
screwed to the outer cylinder 15 at its rim By being pressed, the super magnetostrictive rod 4 is
prestressed in its compression direction. The other disc-shaped spring 14 is formed of, for
example, phosphor bronze having a thickness of about 1 mm and a diameter of about 60 mm,
04-05-2019
4
and the drive rod 10 rotates around a central portion supported by the disc-shaped spring 13 as
a fulcrum The displacement direction is regulated so that it does not occur, and the peripheral
edge portion is fixed to the outer cylinder 13 by the bolt 17, and the bolt portion 9a of the
movable yoke 9 is penetrated at its center and screwed on this It is made to clamp and fix
between the internal thread 10c of the rod 10 and it. Each of the disk-shaped springs 13 and 14
may be made of non-phosphor bronze, spring-use nickel, titanium copper alloy, beryllium copper
alloy, SUS304, SUS631, 613 Al-4V-Tl alloy, 3Al-2.5 V-Tl alloy, or the like. It is formed of a
magnetic material. Further, the super magnetostrictive rod 4 forming the closed magnetic circuit,
the bias magnetic field generating magnet 6, the disk-like yoke 7, the annular yoke 8 and the
other components excluding the movable yoke 9 ie the housing 3, the outer cylinder 13, It is
desirable that the actuator rod 10, the prestress adjustment screw 16 and the like be formed of a
nonmagnetic material.
[0011]
The above is an example structure of this invention, and the effect | action is demonstrated next.
When a voice current is supplied to the magnetic field generating coil 5, the strength of the
magnetic field formed in the axial direction of the giant magnetostrictive rod 4 changes
according to the voice current, so the magnitude of the voice current in the giant
magnetostrictive rod 4 expands and contracts in the axial direction Then, the free end 4b is
displaced. Then, this displacement is transmitted to the diaphragm 12 via the actuator rod 10
and converted into sound. At this time, in the drive rod 11 formed by connecting the giant
magnetostrictive rod 4 and the actuator rod 10, the actuator rod 10 is inserted through the two
plate springs 13 and 14 and the housing is expanded when the giant magnetostrictive rod 4 is
expanded and contracted. Since it is suspended by the plate springs 13 and 14 so as to displace
the space 3 in a non-sliding manner, it does not slide with the annular yoke 8 or the magnetic
field generating coil 5, and hence the sliding There is no inconvenience caused by the movement.
[0012]
Since the giant magnetostrictive rod 4 has extremely high generated stress, a plate material or
the like having a large area can be used as the diaphragm 12 fixed to the tip of the drive rod 11.
For example, pictures, photographs, lithographs, A flat speaker can be formed by fixing the
housing 3 of the giant magnetostrictive actuator 2 to a frame (not shown) which also serves as a
frame such as a picture using indoor equipment such as a wall material or a building material
such as a wall material The super magnetostrictive actuator 2 may be disposed on the back side
04-05-2019
5
of each of the right and left open faces, and each face attached to the drive rod 11 may be fixed
to use the single attached post as a stereo speaker. Further, the drive rod 11 is not limited to the
case where the giant magnetostrictive rod 4 formed of the giant magnetostrictive material is
connected to the actuator rod 10 formed of another material, but is integrally formed of the giant
magnetostrictive material. May be Furthermore, for example, if the resin-diaphragm-like packing
(not shown) is interposed on the surface of the disc-shaped spring 14 on the giant
magnetostrictive rod 4 side, the inside of the magnetostrictive actuator 3 can be formed into a
watertight structure. . Furthermore, the giant magnetostrictive actuator 2 according to the
present invention is not limited to the case where it is used as a conversion unit for converting an
audio signal of the giant magnetostrictive speaker 1 into mechanical vibration, and a sound wave
generator such as underground exploration, ocean tomography, sonar, etc. The invention can be
applied to any application such as an actuator of a fuel injection nozzle, a drive of an autofocus
for a camera, a micropositioner for driving a mirror for observing planets and satellites, etc. It
will be clear if it is. In this case, in the case of vibrating the tip of the drive rod 11 as in a sound
wave generator, an alternating current may be supplied to the magnetic field generating coil 5,
and further, a driving device for a camera autofocus, a micro positioner, etc. In order to displace
the tip of the drive rod 11 by a fixed amount, an alternating current may be supplied to the
magnetic field generating coil 5. Furthermore, when mechanical displacement is applied to the
drive rod 11 of the giant magnetostrictive actuator 2 in the magnetic field formed by the bias
magnetic field generating magnet 6, the giant magnetostrictive rod 4 expands and contracts due
to an external force to generate an electromotive force in the magnetic field generating coil 5.
The super magnetostrictive actuator 2 according to the present invention can be used as a
mechanical displacement-to-current conversion means, for example, a microphone for converting
voice vibration into an electric signal, or active vibration reduction for canceling external
vibration energy and stopping it. It can also be used as an active soundproofing device.
[0013]
As described above, according to the present invention, the drive rod formed by connecting the
actuator rod to the giant magnetostrictive rod comprises a plurality of the actuator rods disposed
at predetermined intervals along the axial direction. The flat spring is suspended by the flat
springs so as to displace in a sliding manner without sliding in the space of the housing when the
giant magnetostrictive rod expands and contracts. Therefore, there is a very good effect that no
inconvenience such as the generation of noise due to sliding occurs.
[0014]
Brief description of the drawings
[0015]
04-05-2019
6
1 is a cross-sectional view showing a giant magnetostrictive speaker using the giant
magnetostrictive actuator according to the present invention.
[0016]
FIG. 2 is a cross-sectional view showing a conventional giant magnetostrictive speaker.
[0017]
Explanation of sign
[0018]
1 ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии
Free end 5 ииии Free end 5 иииии .... field generating coils 6 ----- bias magnetic field generating magnet
7 ----- discoid yoke 8 ..... annular yoke 9 ----- movable yoke 10 ----- Actuator rod 11 иии Drive rod 12
и и и Diaphragm 13, 14 и и и Flat spring 15 и и и Outer cylinder
04-05-2019
7
Документ
Категория
Без категории
Просмотров
0
Размер файла
16 Кб
Теги
jph10145892
1/--страниц
Пожаловаться на содержимое документа