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JP2010067734

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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 JP2010067734
An object of the present invention is to provide a magnetostrictive actuator that suppresses
unnecessary vibration and improves waterproofness without increasing the thickness of the
device, and improves the linearity of the actuator. In a magnetostrictive actuator, a movable
portion and an upper yoke are disposed on the same plane, and an air gap between the two is
filled with an adhesive, and a coil is provided on an outer periphery of the magnetostrictive
element. Furthermore, by arranging the magnet 13 on the outer periphery of the coil 14, the
thinning and waterproof performance of the actuator and the linear performance are improved.
[Selected figure] Figure 1
Magnetostrictive actuator
[0001]
The present invention relates to a magnetostrictive actuator used for various acoustic devices.
[0002]
A conventional magnetostrictive actuator will be described with reference to FIG.
[0003]
FIG. 8 shows a cross-sectional view of a conventional magnetostrictive actuator.
[0004]
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In the figure, reference numeral 1 denotes a magnetostrictive element, and a bobbin 3 around
which a coil 2 is wound is disposed around the magnetostrictive element 1. An upper magnet 4 is
disposed at the upper end of the magnetostrictive element 1, and a lower magnet 5 is disposed at
the lower end. Are arranged respectively.
Further, the movable portion 6 is joined to the upper portion of the upper magnet 4, the upper
yoke 7 is joined to the outer periphery of the movable portion 6 and further to the bottom of the
upper yoke 7 and the lower magnet 5. The lower yoke 8 is disposed to bypass the outer
periphery of
Further, a flange portion 9 is formed on the outer periphery of the bottom surface of the movable
portion 6, and the cushion 10 is disposed between the flange portion 9 and the upper yoke 7 so
as to be sandwiched in the vibration direction of the movable portion 6. doing.
[0005]
The operation of the magnetostrictive actuator configured as described above will be described
below.
A closed magnetic circuit 11 is formed by the upper magnet 4, the lower magnet 5, the movable
portion 6, the upper yoke 7 and the lower yoke 8 described above, and a bias magnetic field is
applied to the magnetostrictive element 1. As a matter of course, the movable portion 6, the
upper yoke 7, and the lower yoke 8 are magnetic materials including iron.
[0006]
The coil 2 produces a change in magnetic field in response to a change in the input signal, and
the magnetostrictive element 1 produces dimensional change in response to the change in
magnetic field. The dimensional change is transmitted to the outside as vibration through the
upper magnet 4 and the movable portion 6.
[0007]
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The cushion 10 is made of an elastic body to suppress unnecessary vibration of the movable
portion 6 to realize performance stabilization.
[0008]
As prior art document information related to the invention of this application, for example,
Patent Document 1 is known.
JP, 2006-311255, A
[0009]
In the above-described magnetostrictive actuator, since the cushion 10 requiring the
arrangement space of a certain thickness between the upper yoke 7 and the movable portion 6
with respect to the vibration direction of the movable portion 6 is present, thinning of the
actuator itself is difficult In addition to having the problem of being present, since a gap is
required between the outer peripheral side surface of the movable portion 6 and the inner
peripheral side surface of the upper yoke 7, it also has a problem in reliability due to the entry of
water droplets or foreign matter.
[0010]
Further, when the upper magnet 4 and the lower magnet 5 for generating a bias magnetic field
are provided at both ends of the magnetostrictive element 1 because magnetic permeability of
the magnetostrictive element 1 is low, sufficient magnetic flux passes through the central part of
the magnetostrictive element 1 There is also a problem that the linearity as an actuator is
deteriorated since a uniform magnetic flux density distribution can not be obtained without any
problem.
[0011]
The present invention solves the above-mentioned conventional problems, and aims to improve
the linearity of the actuator by suppressing unnecessary vibration without increasing the
thickness of the actuator and making the magnetic flux density distribution of the element
uniform. It is.
[0012]
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In order to achieve the above object, according to the present invention, in particular, an elastic
body is provided in a space between the movable portion and the upper yoke disposed on the
outer periphery on the same plane as the movable portion, and a magnet is provided on the coil
outer periphery. It has composition.
[0013]
In the magnetostrictive actuator according to the present invention, unnecessary vibration can be
suppressed without arranging the cushion in the thickness direction of the magnetostrictive
actuator by arranging the elastic body in the space between the movable portion and the upper
yoke as in the conventional example. In addition to the effect, the air gap is sealed by an elastic
body to prevent water droplets and foreign matter from entering inside.
In addition, since a bias magnetic field is applied using a cylindrical magnet having a thickness
equal to the length of the magnetostrictive element, the magnetic flux generated from the magnet
passes through the entire magnetostrictive element, and good linearity and energy efficiency can
be obtained. An effect is also played.
[0014]
Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1
to 7.
[0015]
First Embodiment FIG. 1 is a structural cross-sectional view of a magnetostrictive actuator
according to a first embodiment of the present invention.
[0016]
In the figure, reference numeral 12 denotes a magnetostrictive element, and reference numeral
13 denotes a cylindrical magnet having a thickness equal to the length of the magnetostrictive
element 12. The periphery of a bobbin 15 on which the magnetostrictive element 12 and the coil
14 are wound is shown. , And supplies a bias magnetic field to the magnetostrictive element 12.
[0017]
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A movable portion 16 is joined to the upper end of the magnetostrictive element 12 and
transmits the displacement of the magnetostrictive element 12 to the outside, 17 is an upper
yoke whose upper end is joined to the upper end of the magnet 13, 18 is the magnetostrictive
element 12 and It is a lower yoke joined to the lower end of the magnet 13.
A trimming process is applied to the upper side of the outer peripheral side of the movable
portion 16 and the upper side of the inner peripheral side of the upper yoke 17 to form a gap
therebetween, and the gap is filled with an elastic adhesive 19.
[0018]
Here, by disposing the movable portion 16 and the upper yoke 17 on the same plane, it becomes
possible to make the actuator thinner, and the space between the movable portion 16 and the
upper yoke 17 is sealed with the adhesive 19. In order to stop, it is also possible to prevent
product deterioration caused by water droplets or foreign matter entering the inside.
[0019]
The operation of the magnetostrictive actuator configured as described above will be described
below.
[0020]
The magnetostrictive element 12 generates a magnetostrictive displacement due to the magnetic
field generated from the coil 14, and the movable portion 16 vibrates following the displacement,
and the adhesive 19 having elasticity is formed on the outer periphery of the movable portion
Therefore, unnecessary vibration can be suppressed and performance can be stabilized.
[0021]
Furthermore, by making the thickness of the magnet 13 equal to the thickness of the
magnetostrictive element 12, even if the material of the magnetostrictive element 12 is low in
permeability, the magnetic flux converges to the center of the coil 14, ie, the center of the
magnetostrictive element 12. A magnetic circuit can be formed, and by efficiently passing the
magnetic flux through the entire magnetostrictive element 12, it is possible to suppress the
variation of the magnetic flux density inside the magnetostrictive element 12 and obtain good
linear characteristics of the actuator. .
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[0022]
In the present embodiment, the adhesive filled in the space between the movable portion 16 and
the upper yoke 17 has a viscosity to a certain extent when not reacted, including a silicone
rubber adhesive, and after the reaction, Adhesives with some degree of elasticity are suitable.
At this time, the trimming process applied to the movable portion 16 and the upper yoke 17 can
improve the workability of filling the adhesive and prevent the spread of the adhesive to other
than the desired location by the viscosity of the adhesive itself. It becomes possible.
[0023]
Further, since the magnetostrictive element 12 has the property that the magnetic permeability
changes and the displacement characteristic with respect to the magnetic field also changes by
applying a compressive load, a structure for applying an optimum load is provided inside the
actuator or the weight of the actuator Although a method of applying a load is also conceivable,
the present invention is premised on applying a load from the outside, so there is no need to
provide a structure for applying a load inside the actuator, and therefore the thickness of the
actuator does not increase.
[0024]
Second Embodiment FIG. 2 is a structural cross-sectional view of a magnetostrictive actuator
according to a second embodiment of the present invention, and the same parts as in the first
embodiment will be described with the same reference numerals omitted.
[0025]
In FIG. 2, the difference from the first embodiment is that grooves are provided on the side
surface of the outer peripheral portion of the movable portion 16a and the side surface of each
of the inner peripheral side surfaces of the upper yoke 17a, or on either side. Such a resilient Oring 20 is inserted.
[0026]
While being able to hold | maintain the position of the said movable part 16a stably by this
structure, the said O-ring 20 acts as a damping | braking body, and it becomes possible to
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suppress an unnecessary vibration.
Furthermore, the damping property can be controlled by appropriately selecting the material of
the O-ring 20, and it becomes possible to perform the performance adjustment adapted to the
difference in the physical properties of the body to be vibrated.
[0027]
Third Embodiment FIG. 3 is a structural cross-sectional view of a magnetostrictive actuator
according to a third embodiment of the present invention, and the same parts as in the first
embodiment will be described with the same reference numerals omitted.
[0028]
In the same figure, the point different from the first embodiment and the second embodiment is
that the flange is provided on the lower side of the outer peripheral side of the movable portion
16b and the flange is provided on the upper side of the inner peripheral side of the upper yoke
17b. A resilient adhesive 19b is filled in the space to be formed.
[0029]
Here, in the configuration of these flanges, it is apparent that the same function as the abovedescribed embodiment can be obtained if it is formed on either the movable portion 16b or the
upper yoke 17b.
[0030]
Also, with this configuration, the amount of adhesive filled between the movable portion 16b and
the upper yoke 17b can be increased, and the strength of the device can be further enhanced.
[0031]
Fourth Embodiment FIG. 4 is a structural cross-sectional view of a magnetostrictive actuator
according to a fourth embodiment of the present invention, and the same parts as those in the
first embodiment will be described with the same reference numerals omitted.
[0032]
In the figure, the point different from the first embodiment is that a vibration transfer member
21 having physical property values different from those of the movable portion 16c is joined to
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the upper end of the movable portion 16c.
[0033]
With this configuration, when used in an acoustic application such as a panel speaker, sound
reproduction compatible with the vibrating body can be made by appropriately selecting the
vibration transmitting member 21 according to the condition difference of the material and size
of the panel as the vibrating body. It is possible to
[0034]
The material of the vibration transfer member 21 is preferably a nonmagnetic material such as
aluminum, resin, or rubber.
[0035]
Here, although the present embodiment describes only the above-mentioned difference with
respect to the first embodiment, only the above-mentioned difference is changed also in the
magnetostrictive actuator of the second embodiment and the third embodiment. The same
functions as described above can be added.
[0036]
Fifth Embodiment FIG. 5 is a structural cross-sectional view of a magnetostrictive actuator
according to a fifth embodiment of the present invention, and the same parts as in the first
embodiment will be described with the same reference numerals omitted.
[0037]
In the figure, the difference from the first embodiment is that the recess 22 is formed on the
bottom of the movable portion 16 d and the recess 23 on the upper surface of the lower yoke 18
d according to the shape of the magnetostrictive element 12 d.
[0038]
With this configuration, it is possible to make the device thinner, and to facilitate alignment of
the magnetostrictive element 12d with the movable portion 16d and the lower yoke 18d.
[0039]
Here, although only the above-mentioned differences with respect to the first embodiment are
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described in the present embodiment, only the above-mentioned differences are also obtained in
the magnetostrictive actuators of the second embodiment, the third embodiment and the fourth
embodiment. Can be changed, and the same function as described above can be added.
[0040]
Sixth Embodiment FIG. 6 is a structural cross-sectional view of a magnetostrictive actuator
according to a sixth embodiment of the present invention, and the same parts as those in the first
embodiment will be described with the same reference numerals omitted.
[0041]
In this figure, the difference from the first embodiment is that the magnetostrictive element 12e
is formed by insert molding integrally with the bobbin 15e.
[0042]
With this configuration, it is possible to reduce the number of assembling steps of the actuator,
and to prevent abnormal noise generated by the contact of the magnetostrictive element 12e
with the bobbin 15e.
[0043]
Here, although only the above-mentioned difference with respect to the first embodiment is
described in the present embodiment, it is possible to change only the above-mentioned
difference in the magnetostrictive actuators of the second to fifth embodiments. Yes, and add
similar functionality as described above.
[0044]
Seventh Embodiment FIG. 7 is a structural cross-sectional view of a magnetostrictive actuator
according to a seventh embodiment of the present invention, and the same parts as in the first
embodiment will be described with the same reference numerals omitted.
[0045]
In the figure, the difference from the first to sixth embodiments is that the entire actuator is
sealed with a resin 24.
[0046]
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This configuration improves the durability of the actuator itself including waterproofness and
dust resistance, allowing music to be enjoyed regardless of the place of use, as well as voice
guidance functions for devices exposed to harsh conditions such as cars and home appliances It
is possible to add
[0047]
In addition, as a material of the resin to be sealed, a resin such as PPS (polyphenylene sulfide)
which is excellent in heat resistance and provided with a certain degree of flexibility is suitable.
[0048]
Here, although the present embodiment describes only the above-mentioned differences with
respect to the first embodiment, changing only the above differences also in the magnetostrictive
actuators of the second to sixth embodiments. Yes, and add similar functionality as described
above.
[0049]
Since the magnetostrictive actuator according to the present invention can realize thinning of the
device itself and excellent linearity, installation in a space-saving space becomes easy, and it is
useful as an acoustic application such as a panel speaker and also as an AV device such as a
television It is also useful as a mounted audio device.
[0050]
Structural cross-sectional view of the magnetostrictive actuator according to the first
embodiment of the present invention Structural cross-sectional view of the magnetostrictive
actuator according to the second embodiment of the present invention Structural cross-sectional
view of the magnetostrictive actuator according to the third embodiment of the present invention
Structural cross section of the magnetostrictive actuator Structural cross section of the
magnetostrictive actuator in the fifth embodiment of the present invention Structural cross
section of the magnetostrictive actuator in the sixth embodiment of the present invention
Structural cross section of the magnetostrictive actuator in the seventh embodiment of the
present invention Structural cross section showing an example of a magnetostrictive actuator
Explanation of sign
[0051]
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12, 12d, 12e Magnetostrictive element 13 Magnet 14 Coil 15, 15e Bobbin 16, 16a, 16b, 16c,
16d Movable part 17, 17a, 17b Upper yoke 18, 18d Lower yoke 19, 19b Adhesive 20 O-ring 21
Vibration transmission member 22 movable part recess 23 lower yoke recess
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