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JP2005176122

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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
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DESCRIPTION JP2005176122
The present invention provides a magnetostrictive displacement amplifying device capable of
easily enhancing the amplification factor of displacement and improving the followability of an
output displacement with respect to the displacement of a magnetostrictive element. A
magnetostrictive displacement amplifying device includes a magnetostrictive rod having a barlike shape and a magnetostrictive member having one end a fixed end, the magnetostrictive
member surrounding the outer periphery of the magnetostrictive rod. And a drive coil 26 for
applying a magnetic field in the axial direction L1 of the giant magnetostrictive rod 24, and a
displacement amplification mechanism 30 for amplifying the displacement of the giant
magnetostrictive rod 24 in the axial direction L1. Is configured. Then, the displacement
amplification mechanism 30 is formed of a plate-shaped first elastic member 40 elastically
deformable in the thickness direction according to the displacement of the giant magnetostrictive
rod 24 in the axial direction L1, and the other end 38B of the cylindrical member 38 The fluid 44
filled in the space enclosed by the plate-like second elastic member 42 which is disposed and
elastically deformable in the thickness direction, and the cylindrical member 38 and the first and
second elastic members 40 and 42 Configured. [Selected figure] Figure 2
Magnetostrictive displacement amplification device, magnetostrictive actuator and
magnetostrictive vibration device using the same
[0001]
The present invention relates to a magnetostrictive displacement amplification device using a
magnetostrictive member, a magnetostrictive actuator using the same, and a magnetostrictive
vibration device.
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[0002]
2. Description of the Related Art A magnetostrictive displacement amplifying device is
conventionally known which amplifies and outputs the displacement of a magnetostrictive
member.
[0003]
For example, a conventionally known magnetostrictive displacement amplifying apparatus 100
shown in FIG. 9 includes a displacement amplifying mechanism 103 connected to a substantially
rod-shaped magnetostrictive element 102 (see Patent Document 1).
The displacement amplification mechanism 103 includes a small roller 105 in pressure contact
with the driving member 104 coupled to the magnetostrictive element 102 and a large roller
108 in pressure contact with the driven member 107 coupled to the output shaft 106. And the
large roller 108 are connected concentrically.
[0004]
In the magnetostrictive displacement amplifying apparatus 100, the displacement of the
magnetostrictive element 102 is amplified in proportion to the radius ratio of the small roller
105 and the large roller 108, and is output from the output shaft 106.
[0005]
On the other hand, the magnetostrictive displacement amplification device 150 shown in FIG. 10
includes a lever-type displacement amplification mechanism 152 connected to a substantially
rod-shaped magnetostrictive element 151 (see Patent Document 2).
The lever-type displacement magnifying mechanism 152 is formed of a rod-like member
supported at a fulcrum 153, and one end of the magnetostrictive element 151 is disposed at the
force point 154 and one end of the output shaft 156 is disposed at the action point 155. .
[0006]
In this magnetostrictive displacement amplifying device 150, the displacement of the
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magnetostrictive element 151 is proportional to the ratio of the length between the power point
154 and the fulcrum 153 in the lever type displacement magnifying mechanism 152 and the
length between the fulcrum 153 and the acting point 155. The signal is amplified and output
from the output shaft 156.
[0007]
Japanese Utility Model Laid-Open Publication No. 5-20497 JP-A-5-236595
[0008]
However, in order to increase the amplification factor of displacement in these conventionally
known magnetostrictive displacement amplifying devices 100 and 150, the radius ratio of the
small roller 105 and the large roller 108, the length between the force point 154 and the
fulcrum 153, the fulcrum 153 and the action point Since it is necessary to increase the ratio of
lengths between 155, there is a problem that the displacement amplification mechanism 103 and
the lever type displacement magnification mechanism 152 tend to be large, making it difficult to
make the apparatus compact.
[0009]
Further, due to its structure, there is a limit to the improvement of the followability of the output
shafts 106 and 156 to the displacement of the magnetostrictive elements 102 and 151, and in
particular, it is not suitable for a speaker drive device or the like that requires high followability.
[0010]
The present invention has been made to solve such problems, and while having a small and
simple structure, the amplification factor of displacement can be easily enhanced, and
displacement of the magnetostrictive member It is an object of the present invention to provide a
magnetostrictive displacement amplifying device capable of improving the followability of an
output displacement with respect to the above, and a magnetostrictive actuator and a
magnetostrictive vibration device using the same.
[0011]
The inventor of the present invention can increase the amplification factor of displacement while
having a compact and simple structure, and can improve the followability of the output
displacement to the displacement of the magnetostrictive element. The inventors have found a
magnetostrictive actuator and a magnetostrictive vibration device using the same.
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[0012]
That is, the above object can be achieved by the present invention as described below.
[0013]
(1) A substantially bar-shaped magnetostrictive rod having a magnetostrictive member, one end
of which is a fixed end, and is disposed so as to surround the outer periphery of the
magnetostrictive rod, and applies a magnetic field in the axial direction of the magnetostrictive
rod And a displacement amplification mechanism for amplifying the displacement of the
magnetostrictive rod in the axial direction, and one end of the displacement amplification
mechanism is disposed on the free end side of the magnetostrictive rod. And a substantially
cylindrical member whose inner diameter on the other end side is smaller than the inner
diameter on the one end side, and which is disposed on the one end side of the substantially
cylindrical member according to the axial displacement of the magnetostrictive rod A plate-like
first elastic member elastically deformable in the thickness direction, a plate-like second elastic
member disposed on the other end side of the cylindrical member and elastically deformable in
the thickness direction, A fluid filled in a space sealed by the tubular member and the first and
second elastic members; Magnetostrictive displacement amplification device characterized by
comprising a.
[0014]
(2) The magnetostrictive displacement amplification according to (1), wherein the substantially
cylindrical member in the displacement amplification mechanism is made of a substantially
cylindrical rigid body whose diameter decreases from one end to the other end. apparatus.
[0015]
(3) The substantially cylindrical member in the displacement amplification mechanism is bent so
as to convert an axial displacement of the magnetostrictive rod into a displacement different
from the axial direction, and the normal to the surface of the first elastic member The
magnetostrictive displacement amplification device according to (1) or (2), wherein the surface of
the second elastic member and the normal to the surface of the second elastic member are not
parallel to each other.
[0016]
(4) The magnetostrictive displacement amplification device according to any one of (1) to (3),
further including a member covering the outer peripheral surface of the substantially cylindrical
member in the displacement amplification mechanism.
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[0017]
(5) A substantially bar-shaped magnetostrictive rod having a magnetostrictive member, one end
of which is fixed, and an outer periphery of the magnetostrictive rod, and a magnetic field is
applied in the axial direction of the magnetostrictive rod And a displacement amplification
mechanism for amplifying the displacement of the magnetostrictive rod in the axial direction, and
one end of the displacement amplification mechanism is disposed on the free end side of the
magnetostrictive rod. And a cylinder having a through hole whose inner diameter on the other
end side is smaller than the inner diameter on the one end side, and disposed at both ends of the
through hole in the cylinder, and can slide in the through hole A magnetostrictive displacement
amplification apparatus comprising: a pair of pistons; and a fluid filled in a space enclosed by the
cylinder and the pair of pistons.
[0018]
(6) The through hole in the displacement amplification mechanism is bent so as to convert an
axial displacement of the magnetostrictive rod into a displacement in a direction different from
the axial direction, and the axial direction of the first piston and the second piston The
magnetostrictive displacement amplification device according to (5), characterized in that the
axial direction of (1) is not parallel to the axial direction.
[0019]
(7) The magnetostrictive displacement amplification device according to any one of (1) to (6),
wherein the magnetostrictive member is a giant magnetostrictive member made of a giant
magnetostrictive element.
[0020]
(8) A magnetostrictive actuator characterized by using the magnetostrictive displacement
amplifying device according to any one of (1) to (7).
[0021]
(9) A magnetostrictive vibration device characterized by using the magnetostrictive displacement
amplifying device described in any one of (1) to (7).
[0022]
According to the magnetostrictive displacement amplification device according to the present
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invention, and the magnetostrictive actuator and the magnetostrictive vibration device using the
same, the amplification factor of displacement can be increased while having a compact and
simple structure, and the displacement of the magnetostrictive element This has the excellent
effect of being able to improve the followability of the output displacement to.
[0023]
In the present invention, a magnetostrictive member is provided, and a substantially rod-shaped
magnetostrictive rod having one end fixed and an outer periphery of the magnetostrictive rod are
disposed so as to surround the magnetostrictive rod, and a magnetic field is applied in the axial
direction of the magnetostrictive rod. And a displacement amplification mechanism for
amplifying an axial displacement of the magnetostrictive rod, wherein one end of the
displacement amplification mechanism is disposed on the free end side of the magnetostrictive
rod And the substantially cylindrical member whose inner diameter on the other end side is
smaller than the inner diameter on the one end side, and which is disposed on the one end side
of the substantially cylindrical member, in the axial displacement of the magnetostrictive rod
Accordingly, a plate-like first elastic member elastically deformable in the thickness direction,
and a plate-like second elastic member disposed on the other end side of the cylindrical member
and elastically deformable in the thickness direction, A flow filled in a space sealed by the
cylindrical member and the first and second elastic members When, by magnetostrictive
displacement amplifying device comprising a, it is obtained by solving the above problems.
[0024]
In the present invention, a magnetostrictive member is provided, and a substantially rod-shaped
magnetostrictive rod having one end fixed and an outer periphery of the magnetostrictive rod are
provided so as to surround the magnetostrictive rod in the axial direction of the magnetostrictive
rod. A drive coil for applying a magnetic field, and a displacement amplification mechanism for
amplifying an axial displacement of the magnetostrictive rod, the displacement amplification
mechanism having one end on the free end side of the magnetostrictive rod A cylinder having a
through hole which is disposed and whose inner diameter on the other end side is smaller than
the inner diameter of the one end, and which is disposed at both ends of the through hole in the
cylinder, The same problem as described above is solved by a magnetostrictive displacement
amplifying device including a pair of slidable pistons and a fluid filled in a space enclosed by the
cylinder and the pair of pistons.
[0025]
Hereinafter, Example 1 and Example 2 of this invention are demonstrated in detail based on
drawing.
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[0026]
As shown in FIGS. 1 and 2, a magnetostrictive vibration device 10 to which the magnetostrictive
displacement amplifying device according to the first embodiment of the present invention is
applied includes a casing 12 having a substantially cylindrical shape. To amplify a signal such as
an audio signal input through the magnetostrictive displacement amplification device 14, a
plurality of dry batteries 16 serving as a drive source of the magnetostrictive displacement
amplification device 14, and the jack 18 from the tip guide 13 side; The amplification circuit 20
to output to the magnetostrictive displacement amplification device 14 is partitioned and
accommodated by the substantially disk-shaped partitions 22A and 22B, respectively.
The partition 22A disposed between the magnetostrictive displacement amplifying device 14 and
the plurality of dry cells 16 is formed of a soft magnetic member.
[0027]
The magnetostrictive displacement amplifying device 14 is disposed so as to surround the outer
periphery of the substantially magnetostrictive rod 24 having a substantially rod-like shape
whose one end 24A is fixed to the partition 22A, as shown enlarged in FIG. The drive coil 26 and
the displacement amplification mechanism 30 for amplifying the displacement of the giant
magnetostrictive rod 24 in the axial direction L1 are configured.
[0028]
The giant magnetostrictive rod 24 is, in this example, three substantially disk-shaped bias
magnets 32A to 32C and two substantially cylindrical supermagnetostrictive members disposed
so as to be sandwiched between the three bias magnets 32A to 32C. The bias magnets 32A to
32C and the super magnetostrictive members 34A and 34B are bonded and integrated in the
axial direction L1.
[0029]
The giant magnetostrictive members 34A and 34B use giant magnetostrictive elements as
materials.
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Here, the "super magnetostrictive element" refers to a magnetostrictive element made of a
powder sintered alloy or a single crystal alloy containing a rare earth element and / or a specific
transition metal as a main component (for example, terbium, dysprosium, iron, etc.) And has the
property of causing a large displacement when an external magnetic field is applied.
[0030]
The drive coil 26 has a structure capable of applying a magnetic field in the axial direction L1 to
the giant magnetostrictive members 34A and 34B.
The drive coil 26 is connected to the amplifier circuit 20, and the magnetic field of the drive coil
26 is varied based on a signal input from the outside via the jack 18.
[0031]
Movable tip portion 28 includes a substantially disc-shaped flange portion 28A fixed to bias
magnet 32A of giant magnetostrictive rod 24 and a rod portion 28B extending from this flange
portion 28A along axial direction L1 of giant magnetostrictive rod 24. It is formed.
Further, two springs 36A and 36B are provided between the flange 28A of the movable tip 28
and the tip guide 13, and the movable tip 28 is biased to the giant magnetostrictive rod 24 side.
Furthermore, the rod portion 28B of the movable tip portion 28 is in contact with the
displacement amplification mechanism 30, and a structure capable of transmitting the vibration
in the axial direction L1 of the giant magnetostrictive rod 24 to the displacement amplification
mechanism 30 via the movable tip portion 28 It has become.
[0032]
As shown in FIG. 3, the displacement amplification mechanism 30 has a cylindrical member 38
whose inside diameter R2 on the other end 38B side is smaller than the inside diameter R1 on
the one end 38A side (R1> R2), and this cylindrical member 38. The plate-shaped first elastic
member 40, which is disposed on the one end side 38A in the case and is elastically deformable
in the thickness direction according to the displacement of the giant magnetostrictive rod 24 in
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the axial direction L1, and the other end side 38B of the cylindrical member 38. The fluid 44
filled in the space enclosed by the plate-like second elastic member 42 which is disposed and
elastically deformable in the thickness direction, and the cylindrical member 38 and the first and
second elastic members 40 and 42 It is configured.
[0033]
The outer peripheral surface of the cylindrical member 38 of the displacement amplification
mechanism 30 is covered with the distal end guide 13, and the deformation in the radial
direction is restricted by the distal end guide 13.
[0034]
The cylindrical member 38 is a cylindrical rigid body whose diameter decreases from one end
38A to the other end 38B, and a rigid body such as metal or plastic can be applied to the
cylindrical member 38, for example. .
In addition, an elastic member such as rubber can be applied to the first and second elastic
members 40 and 42 disposed at both ends of the cylindrical member 38, for example.
[0035]
Next, the operation of the magnetostrictive vibration device 10 according to the first embodiment
will be described.
[0036]
When a signal is input to the magnetostrictive vibration device 10 via the jack 18, the signal is
amplified by the amplification circuit 20 and then input to the drive coil 26 of the
magnetostrictive displacement amplification device 14.
Then, the drive coil 26 is driven by the amplified signal, and the coil magnetic field of the drive
coil 26 changes.
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As a result, the giant magnetostrictive rod 24 is displaced (vibrated) in the axial direction L1
according to the signal.
The displacement in the axial direction L1 is input to the displacement amplification mechanism
30 via the movable tip portion 28, and amplified by the displacement amplification mechanism
30.
[0037]
More specifically, as shown in FIG. 3, when the displacement of the magnetostrictive rod 24 in
the axial direction L1 is transmitted by the movable tip portion 28, the first elastic member 40 of
the displacement amplification mechanism 30 is pressed, The first elastic member 40 is
displaced at maximum in the axial direction L1 by the displacement amount X1.
As a result, the second elastic member 42 protrudes by the volume integral of the fluid 44
pushed out by the first elastic member 40, and is displaced by the displacement amount X2 at
the maximum in the axial direction L1.
[0038]
Although the displacement amount X1 of the first elastic member 40 is amplified based on the
ratio of the area in the thickness direction of the first elastic member 40 and the second elastic
member 42, the cylindrical member 38 in the present invention is used. Since the inner diameter
R2 on the other end 38B side is smaller than the inner diameter R1 on the one end 38A side, the
area of the second elastic member 42 in the thickness direction is the area of the first elastic
member 40 in the thickness direction Is also getting smaller.
Therefore, the displacement amount (output displacement amount) X2 of the second elastic
member 42 is larger than the displacement amount of the first elastic member 40 (displacement
amount of the giant magnetostrictive rod 24) X1.
[0039]
The displacement of the giant magnetostrictive rod 24 amplified in this manner is output to the
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outside through the second elastic member 42 of the displacement amplification mechanism 30.
[0040]
According to the magnetostrictive displacement amplifying device 14 in accordance with the first
embodiment of the present invention, a substantially rod-shaped giant magnetostrictive rod 24
having giant magnetostrictive members 34A and 34B and having one end 24A as a fixed end,
and this magnetostrictive A drive coil 26 disposed around the outer periphery of the rod 24 for
applying a magnetic field in the axial direction L1 of the giant magnetostrictive rod 24, and a
displacement amplification mechanism for amplifying displacement of the giant magnetostrictive
rod 24 in the axial direction L1. The displacement amplification mechanism 30 has one end 38A
disposed on the free end 24B side of the giant magnetostrictive rod 24, and an inner diameter R2
on the other end 38B side than the inner diameter R1 on the one end 38A side. Is disposed on
one end 38A of the cylindrical member 38, and can be elastically deformed in the thickness
direction according to the displacement of the giant magnetostrictive rod 24 in the axial direction
L1. First elastic member 40 and tubular member In the space enclosed by the plate-like second
elastic member 42 disposed on the other end side 38 B of 8 and elastically deformable in the
thickness direction, and the cylindrical member 38 and the first and second elastic members 40
and 42 Of the displacement by changing the ratio of the area in the thickness direction of the
first elastic member 40 and the second elastic member 42 while having a small size and a simple
structure. The amplification factor can be easily increased.
Further, since the displacement of the giant magnetostrictive rod 24 is transmitted by the fluid
44, the followability of the output displacement to the displacement of the magnetostrictive
member can be improved.
[0041]
In particular, since the cylindrical member 38 is made of a substantially cylindrical rigid body
whose diameter decreases from one end 38A to the other end 38B, the displacement of the
magnetostrictive member can be amplified more efficiently.
[0042]
Further, since the distal end guide 13 covering the radially outer peripheral surface of the
cylindrical member 38 is provided, the radial deformation of the cylindrical member 38 can be
regulated by the distal end guide 13. Also in this respect, the magnetostrictive member High
efficiency of displacement amplification is achieved.
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[0043]
The magnetostrictive displacement amplifying apparatus according to the present invention is
not limited to the structure, shape, etc. of the magnetostrictive displacement amplifying
apparatus 10 according to the first embodiment. For example, the cylindrical member 38 in the
displacement amplifying mechanism 30 has an angle It may be a cylindrical shape or the like,
and may be a member having rigidity to such an extent that the displacement of the giant
magnetostrictive rod 24 in the axial direction L1 can be transmitted.
[0044]
Also, like the cylindrical member 52 in the displacement amplification mechanism 50 shown in
FIG. 4, the displacement of the giant magnetostrictive rod 24 in the axial direction L1 is bent so
as to convert it into a displacement different from that in the axial direction L1. (1) If the normal
L1 on the surface of the elastic member 40 and the normal L2 on the surface of the second
elastic member 42 are not parallel, in addition to the amplification of the displacement of the
magnetostrictive member, conversion of the displacement direction is also performed Can.
[0045]
That is, the magnetostrictive displacement amplifying device according to the present invention
comprises a magnetostrictive member, and is disposed so as to surround an outer periphery of
the magnetostrictive rod and a substantially bar-like magnetostrictive rod whose one end is a
fixed end, A drive coil for applying a magnetic field in the axial direction of the magnetostrictive
rod, and a displacement amplification mechanism for amplifying the displacement in the axial
direction of the magnetostrictive rod, the displacement amplification mechanism having the
magnetostriction at one end A cylindrical member disposed on the free end side of the rod and
having a diameter decreasing from one end side to the other end side, and disposed on the one
end side of the substantially cylindrical member, the axial direction of the magnetostrictive rod A
plate-shaped first elastic member elastically deformable in the thickness direction according to
the displacement of the second member, and a plate-shaped second elastic member disposed on
the other end side of the cylindrical member and elastically deformable in the thickness direction
Member, and the hollow sealed by the cylindrical member and the first and second elastic
members A fluid filled within, as long as it becomes a.
[0046]
Next, a magnetostrictive actuator AT1 to which the magnetostrictive displacement amplifying
device according to the second embodiment of the present invention is applied will be described.
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[0047]
As shown in FIG. 5, the magnetostrictive actuator AT1 includes a magnetostrictive displacement
amplifying device 60. The magnetostrictive displacement amplifying device 60 includes a
substantially rod-shaped giant magnetostrictive rod 61 having one end 61A fixed to the casing
64; A drive coil 66 is provided to surround the outer periphery of the giant magnetostrictive rod
61, and a displacement amplification mechanism 68 for amplifying the displacement of the giant
magnetostrictive rod 61 in the axial direction L3.
The drive coil 66 is the same as the magnetostrictive speaker SP1 described above, and thus the
description thereof is omitted.
[0048]
The giant magnetostrictive rod 61 is, in this example, two substantially disk-shaped bias magnets
62A and 62B and a substantially columnar giant magnetostrictive member 63 disposed so as to
be sandwiched between the two bias magnets 62A and 62B. The bias magnets 62A and 62B and
the giant magnetostrictive member 63 are bonded in an axial direction L3 and integrated.
[0049]
The displacement amplification mechanism 68 is disposed at a cylinder 72 having a through hole
70 and at both ends 70A and 70B of the through hole 70 in the cylinder 72, and a pair of pistons
74 and 76 which can slide in the through hole 70. And a fluid 78 filled in a space sealed by the
cylinder 72 and the pair of pistons 74, 76.
[0050]
In the through hole 70 of the cylinder 72, one end 70A is disposed on the free end 61B side of
the giant magnetostrictive rod 61, and the inner diameter R4 on the other end 70B side is
smaller than the inner diameter R3 on the one end 70A side (R3> R4 ).
[0051]
Next, the operation of the magnetostrictive actuator AT1 according to the second embodiment
will be described.
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[0052]
When a predetermined voltage is applied to the drive coil 66, the giant magnetostrictive rod 24
is displaced (stretched) in the axial direction L3 in accordance with the magnitude of the coil
magnetic field of the drive coil 66.
The displacement in the axial direction L3 is input to the first piston 74 and then transmitted to
the second piston 76 via the fluid 78.
[0053]
Although the displacement X3 of the first piston 74 is amplified based on the ratio of the cross
sectional area of the first piston 74 and the second piston 76, the through hole 70 in the present
invention has an inner diameter on the one end 70A side. Since the inner diameter R4 on the
other end 70B side of R3 is smaller than the R3, the cross-sectional area of the second piston 76
is smaller than the cross-sectional area of the first piston 74.
Accordingly, the displacement amount (output displacement amount) X4 of the second piston 76
is larger than the displacement amount (displacement amount of the giant magnetostrictive rod
61) X3 of the first piston 74.
[0054]
The displacement of the giant magnetostrictive rod 61 amplified in this manner is output to the
outside through the second piston 76 of the displacement amplification mechanism 68.
[0055]
The inventors of the present invention also collected data on the relationship between the
magnitude of the voltage applied to the drive coil 66 and the displacement of the first and second
pistons 74 and 76.
In this experiment, a cylindrical member with a diameter of 7.4 mm and a length of 20 mm is
04-05-2019
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applied as the giant magnetostrictive member 63. The drive coil 66 is a wire type AWG, a
diameter of 8 mm, a length of 20 mm, and 2000 turns. And
Furthermore, the voltage supplied to the drive coil 66 was 0 to 120 V, and a 1 KHz pulse
magnetic field was applied to the drive coil 66.
The first piston 74 had a diameter of 10 mm and a length of 10 mm, and the second piston 76
had a diameter of 3.2 mm and a length of 10 mm.
[0056]
As a result, as shown in FIG. 6, the output displacement (the displacement of the second piston
76) X4 of the magnetostrictive actuator AT1 is the displacement (the displacement of the giant
magnetostrictive rod 61) It was found that the displacement of the first piston 74 was amplified
about 10 times X3.
[0057]
As described above, also by the magnetostrictive displacement amplification apparatus 60
according to the second embodiment of the present invention, the same effect as that of the
magnetostrictive displacement amplification apparatus 14 according to the first embodiment can
be obtained.
[0058]
Moreover, according to the magnetostrictive actuator AT1, it is possible to solve the conventional
problem that the sound pressure of low frequency can not be obtained sufficiently.
[0059]
Specifically, since the sound pressure of sound is determined by the amplitude and frequency of
the diaphragm, in order to obtain the same sound pressure, an amplitude larger than the
amplitude of the high frequency is required at the low frequency.
Also, in general, in the magnetostrictive actuator, the dimensional change of the magnetostrictive
member is determined by the strength of the applied magnetic field, so the dimensional change
04-05-2019
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occurs based on the magnetic field strength due to the magnitude of each frequency component
determined by the magnitude of the audio frequency component. .
For example, in the case of applying a magnetostrictive actuator to a plate-like speaker, the low
frequency amplitude produces oscillation of an amplitude determined by the frequency
component of the electric signal, so only low sound pressure can be obtained compared to high
frequency. According to the magnetostrictive actuator AT1 of the second embodiment, large
vibration can be transmitted to the diaphragm, and low frequency sound pressure can be
obtained at the same level as high frequency sound pressure.
[0060]
The magnetostrictive displacement amplifying device according to the present invention is not
limited to the structure, shape, etc. of the magnetostrictive displacement amplifying device 60
according to the second embodiment, and, for example, the displacement amplifying mechanism
of the magnetostrictive actuator AT2 shown in FIG. 80, the through hole 82 is bent so as to
convert the displacement in the axial direction L3 of the giant magnetostrictive rod 61 into the
displacement in the direction L4 different from the axial direction L3, and the axial direction L3
of the first piston 74 If the axial direction L4 of the two pistons is made nonparallel, not only the
effect of the magnetostrictive actuator AT1 can be obtained, but also the conversion of the
displacement direction can be performed.
[0061]
The inventors of the present invention also collected data on the relationship between the
magnitude of the voltage applied to the drive coil 66 and the displacement of the first and second
pistons 74 and 76 in the magnetostrictive actuator AT2.
In this experiment, a cylindrical member with a diameter of 3 mm and a length of 16 mm was
applied as the giant magnetostrictive member 63, and the drive coil 66 was a wire type AWG
with a diameter of 4 mm, a length of 16 mm, and 1000 turns. .
Furthermore, the voltage supplied to the drive coil 66 was 0 to 5 V, and a 1 KHz pulse magnetic
field was applied to the drive coil 66.
04-05-2019
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The first piston 74 had a diameter of 5 mm and a length of 10 mm, and the second piston 76 had
a diameter of 3.2 mm and a length of 10 mm.
[0062]
As a result, as shown in FIG. 8, the output displacement amount (the displacement amount of the
second piston 76) X6 of the magnetostrictive actuator AT2 is the displacement amount of the
giant magnetostrictive rod 61 in the voltage 1 to 5 V range in which data is collected. It is found
that the displacement amount of the first piston 74) is amplified about 2.5 times X5.
[0063]
In the magnetostrictive displacement amplifying apparatus 60 according to the second
embodiment, the first piston 74 is directly fixed to the giant magnetostrictive rod 61 in order to
make the apparatus compact, but the present invention is not limited to this. Instead, a
displacement transmission member such as the movable tip 28 in the first embodiment may be
interposed between the giant magnetostrictive rod 61 and the first piston 74.
[0064]
That is, the magnetostrictive displacement amplifying device according to the present invention
comprises a magnetostrictive member, and is disposed so as to surround an outer periphery of
the magnetostrictive rod and a substantially bar-like magnetostrictive rod whose one end is a
fixed end, A drive coil for applying a magnetic field in the axial direction of the magnetostrictive
rod, and a displacement amplification mechanism for amplifying the displacement in the axial
direction of the magnetostrictive rod, the displacement amplification mechanism having the
magnetostriction at one end A cylinder having a through hole disposed on the free end side of
the rod and having an inner diameter smaller on the other end side than the inner diameter on
the one end side, and disposed on both ends of the through hole in the cylinder What is
necessary is to have a pair of pistons that can slide in the through hole, and a fluid filled in a
space sealed by the cylinder and the pair of pistons.
[0065]
If it is not necessary to increase the amount of displacement of the magnetostrictive
displacement amplifying devices 14 and 60 according to the first embodiment and the second
embodiment, the magnetostrictive member made of magnetostrictive elements may be applied
instead of the giant magnetostrictive member. Good.
[0066]
04-05-2019
17
1 is a schematic side sectional view showing a magnetostrictive vibration device to which the
magnetostrictive displacement amplification device according to the first embodiment of the
present invention is applied, FIG. 1 is a schematic partial enlarged view showing the
displacement amplification mechanism in the periphery of the magnetostrictive displacement
amplification device in FIG. FIG. 5 is a schematic side sectional view showing another example of
the displacement amplification mechanism in FIG. 1; FIG. 5 is a schematic side sectional view
showing a magnetostrictive actuator to which the magnetostrictive displacement amplifying
device according to the second embodiment of the present invention is applied; 5 is a schematic
side sectional view showing another example of the magnetostrictive actuator in the table 5
showing the relationship between the magnitude of the voltage applied to the first and second
pistons and the voltage applied to the drive coil of the magnetostrictive actuator in FIG. Table
showing the relationship between the magnitude and displacement of the first and second
pistons Schematic side sectional view showing the conventional magnetostrictive displacement
amplifying device Drawing
Explanation of sign
[0067]
L1 to L4 ... axial direction R1 to R6 ... inner diameter X1 to X6 ... displacement amount AT1, AT2
... magnetostrictive actuator 10, 60 ... magnetostrictive vibration device 12, 64 ... casing 13 ... tip
guide 14, 100, 150 ... magnetostrictive displacement amplification device 16 ... dry cell 18 ... jack
20 ... amplification circuit 22A, 22B ... partition wall 24, 61 ... super magnetostrictive rod 26, 66
... drive coil 28A ... flange section 28B ... rod section 30, 50, 68, 80, 103 ... displacement
amplification mechanism 32A, 32B, 32C, 62A, 62B ... bias magnet 34A, 34B, 63 ... super
magnetostrictive member 36A, 36B ... spring 38, 52 ... cylindrical member 40 ... first elastic
member 42 ... second elastic member 44, 78 ... fluid 70, 82 ... through hole 72 ... cylinder 74 ...
first piston 76 ... second piston 102, 151 ... magnetostrictive element 104 ... Elements 105 ...
small rollers 106,156 ... output shaft 107 ... driven member 108 ... large roller 152 ... lever-type
displacement magnifying mechanism 153 ... supporting point 154 ... power point 155 ... action
point
04-05-2019
18
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