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JP2013219567

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DESCRIPTION JP2013219567
PROBLEM TO BE SOLVED: To provide a giant magnetostrictive vibrator having a simple structure
having a small number of parts capable of preventing generation of noise and the like even when
the giant magnetostrictive element expands and contracts. SOLUTION: A vibrating portion
comprising super magnetostrictive elements 17a and 17b and magnets 16a to 16c, a bobbin 13
around which a coil 14 for generating a magnetic field is wound, and a side wall of the housing
10 in a housing space of the housing 10. A disk-shaped yoke 12 is built in which the outer
peripheral surface is opposed to the inner surface of the part with a predetermined distance.
When the lid portion 11 is screwed on the upper portion of the housing 10, the yoke 12 is biased
downward by the preload spring 11b of the lid portion 11, so that the magnetostrictive elements
17a and 17b are preloaded in the compression direction. [Selected figure] Figure 1
Giant Magnetostrictive Vibrator
[0001]
The present invention relates to a giant magnetostrictive vibrator which expands and contracts a
giant magnetostrictive element by a magnetic field and transmits its displacement to the outside
of a housing.
[0002]
Although magnetostrictive elements that expand and contract in response to the application of a
magnetic field have been known for a long time, the magnetostrictive elements so far have small
displacements, and thus have hardly been used practically.
04-05-2019
1
In recent years, magnetostrictive elements (called super-magnetostrictive elements ) having a
very large displacement such as 1500 ppm to 2000 ppm have become known, and various usage
forms thereof are currently proposed. For example, it has been proposed to use it as a drive unit
(super-magnetostrictive actuator) of an acoustic speaker, paying attention to the level of
responsiveness and magnitude of the driving force of the magnetostrictive element. The
configuration of the conventional giant magnetostrictive actuator 100 shown in Patent Document
1 is shown in a cross-sectional view in FIG. The giant magnetostrictive actuator 100 shown in
FIG. 19 is disposed on the giant magnetostrictive element 111, a coil 112 wound around the
giant magnetostrictive element 111, and one end of the giant magnetostrictive element 111, and
the super magnetostrictive actuator 100 corresponds to the application of the magnetic field. A
shaft 113 driven in the axial direction by the expansion and contraction of the magnetostrictive
element 111, a yoke 114 disposed on the other end side of the giant magnetostrictive element
111 for fixing the same, and a casing 115 accommodating the respective members There is.
[0003]
The giant magnetostrictive element 111 is a rod-like body made of a giant magnetostrictive
material that expands and contracts in response to the application of a magnetic field, and as the
giant magnetostrictive material used, Tb (terbium) -Dy (dysprosium) -Fe (iron) It is considered to
be an alloy material with a central composition. A magnetic body 116 a substantially free from
residual magnetic flux is disposed at one end of the giant magnetostrictive element 111, and a
permanent magnet 116 b is disposed at the other end of the giant magnetostrictive element 111.
The magnetic body 116 a and the permanent magnet 116 b apply a magnetic bias to the giant
magnetostrictive element 111. The shaft 113 has a rod-like main body portion 113 a and a collar
portion 113 b provided at the lower end of the main body portion 113 a. The axis of the main
body 113a substantially coincides with the axis of the giant magnetostrictive element 111, and
the tip thereof is open. The flange portion 113 b has a diameter larger than that of the main body
portion 113 a, and the end surface 113 d thereof is pressed against the giant magnetostrictive
element 111 via at least the magnetic member 116 a by the biasing of the spring 117. Thus,
when a signal current corresponding to the acoustic signal to be reproduced is supplied to the
coil 112, the magnetic field generated by the coil 112 is applied to the giant magnetostrictive
element 111, and the expansion and contraction of the giant magnetostrictive element 111
according to the magnetic field strength is the shaft 113 It will be transmitted to the tip of the A
diaphragm is not attached to the tip 113c of the shaft 113, and the user can make this member a
diaphragm by bringing the tip of the shaft 113 into close contact with a plate-like member. That
is, any plate-like member can be used as the diaphragm.
04-05-2019
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[0004]
At the tip of the housing 115, a guide hole 115a for causing the main body 113a of the shaft
113 to project is provided, whereby the tip 113c of the shaft 113 is opened to the outside of the
housing 115 from the guide hole 115a. . The movement of the shaft 113 in a direction different
from the axial direction is restricted by the guide hole 115a. The diameter of the guide hole 115a
is set to be larger than the diameter of the main body 113a of the shaft 113 so as not to inhibit
the axial movement of the shaft 113. Therefore, the main body 113a of the shaft 113 and the
housing 115 There is a slight gap between the When an alternating current signal current is
supplied to the coil 112, the giant magnetostrictive element 111 is displaced in the extension
direction. In order to transmit the displacement in the extension direction to an object (for
example, a plate material) in contact with the tip of the shaft 113, it is necessary to displace the
displacement in the projecting direction and the pulling direction. The shaft 113 is pressed
against the magnetostrictive element 111.
[0005]
In the conventional super magnetostrictive actuator 100 as shown in FIG. 19, the distal end of
the main body 113a of the shaft 113 disposed via the magnetic body 116a is enclosed so as not
to cause rattling when the super magnetostrictive element 111 expands and contracts. The
sliding contact is supported by the guide hole 115a of the body 115, and when the giant
magnetostrictive element 111 expands and contracts, the shaft 113 is rubbed by the guide hole
115a, and the sliding noise is transmitted to the diaphragm to generate noise. Furthermore, there
is a problem that the sliding resistance changes due to various external factors. Therefore, a
supermagnetostrictive speaker is conventionally proposed in which noise due to sliding does not
occur when the giant magnetostrictive rod is expanded and contracted (see Patent Document 2).
[0006]
The configuration of the conventional giant magnetostrictive speaker 200 shown in Patent
Document 2 is shown in a cross-sectional view in FIG. The conventional giant magnetostrictive
speaker 200 shown in FIG. 20 uses a giant magnetostrictive actuator as a conversion unit for
converting an audio current into mechanical vibration, and the giant magnetostrictive actuator is
formed of a giant magnetostrictive material in a housing 203 A magnetic field generating coil
205 for forming a magnetic field in the axial direction of the giant magnetostrictive rod 204
04-05-2019
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around the giant magnetostrictive rod 204 is disposed with a predetermined clearance to the
giant magnetostrictive rod 204, and further around the giant magnetostrictive rod 204. A bias
magnetic field generating magnet 206 for applying a bias magnetic field to the giant
magnetostrictive rod 204 is disposed. The giant magnetostrictive rod 204 is made of a giant
magnetostrictive material such as an alloy material whose central composition is Tb-Dy-Fe. One
end of each of the giant magnetostrictive rod 204, the magnetic field generating coil 205, and
the bias magnetic field generating magnet 206 is supported by the disk yoke 207, and one end of
the giant magnetostrictive rod 204 is axially moved by the disk yoke 207. It is considered
impossible.
[0007]
The other end of the magnetic field generating coil 205 and the bias magnetic field generating
magnet 206 is supported by the annular yoke 208, and the other end of the giant
magnetostrictive rod 204 has a predetermined clearance with the annular yoke 208. A movable
yoke 209 disposed at the center portion is connected to be movable in the axial direction. The
giant magnetostrictive rod 204, the disk-like yoke 207, the bias magnetic field generating
magnet 206, the annular yoke 208, and the movable yoke 209 form a closed magnetic circuit
structure. Further, an actuator rod 210 is integrally connected to a free end of the giant
magnetostrictive rod 204 via a movable yoke 209, and a driving rod is formed of the giant
magnetostrictive rod 204, the movable yoke 209 and the actuator rod 210. The displacement of
the free end when the giant magnetostrictive rod 204 expands and contracts is transmitted to the
tip of the actuator rod 210. Then, a diaphragm 212 serving as a sound emitting unit for
converting mechanical vibration of the giant magnetostrictive rod 204 generated by the
magnetic field change of the magnetic field generating coil 205 into sound is fixed to the tip of
the actuator rod 210 through the mounting disc 212a. Thus, the giant magnetostrictive speaker
200 is formed.
[0008]
In addition, an outer cylinder 215 is mounted on the housing 203 of the giant magnetostrictive
actuator for supporting the actuator rod 210 protruding from the giant magnetostrictive actuator
through the disc-shaped plate springs 213 and 214. Then, when the actuator rod 210 is inserted
through the two plate springs 213 and 214 disposed at predetermined intervals along the axial
direction, and when the giant magnetostrictive rod 204 expands and contracts, the actuator rod
210 becomes giant magnetostrictive. In a state in which a predetermined clearance is maintained
between the rod 204 and the magnetic field generating coil 205 and between the movable yoke
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209 and the annular yoke 208, displacement is made in the axial direction and in the space of
the housing 203 without sliding. It is suspended by each leaf spring 213, 214 as shown in FIG.
The plate spring 213 for supporting the tip end side of the actuator rod 210 is made of, for
example, phosphor bronze, and a bolt portion 210a formed at the tip of the actuator rod 210 is
penetrated in the center portion. The rim portion is fixed to the lower surface of the peripheral
portion of the prestress adjustment screw 216 screwed to the outer cylinder 215 while being
fixed by the fitted nut 210 b, and pressed against the giant magnetostrictive rod 204. The
compression direction is prestressed.
[0009]
Furthermore, the other plate spring 214 is formed of, for example, phosphor bronze, and
restricts the displacement direction so that the actuator rod 210 does not rotate around the
central portion supported by the plate spring 213 or generate backlash. The peripheral portion
of the movable yoke 209 is fixed to the outer cylinder 213 by the bolt 217, and the bolt portion
209a of the movable yoke 209 is penetrated at the center thereof and is held between the
actuator screw 210 and the female screw portion. . Here, when a voice current is supplied to the
magnetic field generating coil 205, the strength of the magnetic field formed in the axial
direction of the giant magnetostrictive rod 204 changes according to the voice current, so the
giant magnetostrictive rod 204 responds to the strength of the voice current. It expands and
contracts in the axial direction, and its free end is displaced. Then, this displacement is
transmitted to the diaphragm 212 via the actuator rod 210 and converted into sound. At this
time, in the drive rod formed by connecting the giant magnetostrictive rod 204 and the actuator
rod 210, the actuator rod 210 is inserted through the two plate springs 213 and 214, and when
the giant magnetostrictive rod 204 expands and contracts. Since it is suspended by the leaf
springs 213 and 214 so as to displace in the space in a non-sliding manner, it does not slide with
the annular yokes 208 and the magnetic field generating coil 205, thus noise due to the sliding
Etc. will not occur.
[0010]
Patent No. 4272085 gazette Patent No. 3615883 gazette
[0011]
In the conventional giant magnetostrictive speaker, although generation of noise and the like can
be prevented even if the giant magnetostrictive element is expanded and contracted, there is a
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problem that the structure becomes complicated.
And since a structure becomes complicated, the number of parts increases and the problem that
it can not make cheaply arises. An object of the present invention is to provide a giant
magnetostrictive vibrator having a small number of parts capable of preventing generation of
noise and the like even when the giant magnetostrictive element expands and contracts, and
having a simple structure.
[0012]
In order to achieve the above object, according to the present invention, there is provided a
casing having a cylindrical side wall portion and a bottom portion, an upper surface being
opened and a storage space being formed therein, a magnet, and a bias magnetic field A vibrating
portion comprising a magnetostrictive element being applied, a lower end being fixed to the
bottom portion of the casing, and a magnetic field in the axial direction of the vibrating portion
and accommodated in the storage space of the casing A coil for generating a magnetic field,
which is provided around the excitation unit and stored in the storage space of the housing so as
to be generated, and is provided in the storage space of the housing at the tip of the excitation
unit. And an outer peripheral surface is fixed to an upper portion of the housing so as to close an
opening of a top surface of the housing and a plate-like yoke opposed to the inner surface of the
side wall portion of the housing with a predetermined distance. And at least a central portion of
the lid has elasticity, and the lid is the lid. When it is fixed to the body, the main feature is that
the yoke is biased downward by the central portion of the lid portion, and is preloaded in the
direction in which the super magnetostrictive element in the excitation portion is compressed.
There is.
[0013]
According to the present invention, the lid is configured so as to be fixed to the housing so that
the lid can take out the displacement of the giant magnetostrictive element, and when the lid is
fixed to the housing, the yoke is attached downward by the center of the lid. By being biased, the
giant magnetostrictive element is preloaded in the compression direction.
This makes it possible to provide a giant magnetostrictive vibrator having a simple structure, and
to prevent generation of noise and the like even when the giant magnetostrictive element
expands and contracts.
04-05-2019
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[0014]
BRIEF DESCRIPTION OF THE DRAWINGS It is an upper side figure which shows the structure of
the super-magnetostriction vibrator concerning 1st Example of this invention, and is a front view
shown by aa cross-sectional view. It is an exploded view which shows the structure of the supermagnetostrictive oscillator concerning 1st Example of this invention. It is a top view which shows
the structure of the super-magnetostrictive oscillator concerning 2nd Example of this invention,
and is a front view shown by bb sectional drawing. It is an exploded view which shows the
structure of the super-magnetostrictive oscillator concerning 2nd Example of this invention. It is
sectional drawing which shows the structure of a part of modification of the supermagnetostriction vibrator concerning 1st Example of this invention. It is sectional drawing which
shows the structure of a part of modification of the super-magnetostrictive oscillator concerning
2nd Example of this invention. It is an upper side figure which shows the structure of the supermagnetostrictive oscillator concerning 3rd Example of this invention, and is a front view shown
by cc sectional drawing. It is an exploded view which shows the structure of the supermagnetostrictive oscillator concerning 3rd Example of this invention. It is an upper side figure
which shows the structure of the super-magnetostrictive oscillator concerning 4th Example of
this invention, and is a front view shown by dd sectional drawing. It is an exploded view which
shows the structure of the super-magnetostrictive oscillator concerning 4th Example of this
invention. It is the top view which shows the structure of the modification of the cover part in the
super-magnetostriction vibrator concerning the Example of this invention, the front view shown
by sectional drawing, and a bottom view. They are a top view which shows the structure of the
super-magnetostriction vibration exciter concerning 5th Example of this invention, the front view
shown by sectional drawing, and the top view shown by ee sectional drawing. It is a front view
which shows the structure of the modification of the super-magnetostrictive oscillator concerning
5th Example of this invention by sectional drawing. It is a figure which shows the magnetic fielddistortion amount characteristic of the super-magnetostrictive element in the supermagnetostrictive oscillator concerning the Example of this invention. They are a front view which
shows the structure of the 1st plane speaker to which the super-magnetostrictive exciter of 1st
Example of this invention is applied, a bottom view, and the A section enlarged view. It is the
front view, top view, and bottom view showing the composition of the fixture in the 1st plane
speaker to which the super-magnetostrictive oscillator of the 1st example of the present
invention is applied. FIG. 6A is a front view showing the configuration of a second flat speaker to
which the giant magnetostrictive vibrator of the first embodiment of the present invention is
applied, and FIG. 20B is a bottom view showing the configuration of the lower surface of the
giant magnetostrictive vibrator applied. It is a figure which shows the structure of the 3rd plane
speaker to which the super-magnetostrictive oscillator of 1st Example of this invention is applied.
It is a front view which shows the structure of the conventional super-magnetostrictive actuator
with sectional drawing. It is a front view which shows the structure of the conventional super-
04-05-2019
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magnetostrictive speaker by sectional drawing.
[0015]
The configuration of the giant magnetostrictive vibration exciter 1 according to the first
embodiment of the present invention is shown in FIG. 1 and FIG. FIG. 1 (a) is a top view showing
the configuration of the giant magnetostrictive vibration exciter 1 of the first embodiment, and
FIG. 1 (b) is a cross section taken along the line aa of the configuration of the giant
magnetostrictive vibration exciter 1 of the first embodiment. It is a front view shown by a figure,
FIG. 2: is an exploded view which shows the structure of each part of the super-magnetostrictive
vibration exciter 1 of 1st Example. The giant magnetostrictive vibration exciter 1 according to the
first embodiment shown in these figures includes a vibration exciter 17 composed of a giant
magnetostrictive element inside a waterproof structure composed of a casing 10 made of a
magnetic material and a lid 11. A coil unit for generating a magnetic field in the axial direction of
the excitation unit 17 is incorporated. The housing 10 has a cylindrical side wall portion 10c and
a bottom portion 10b, and the upper surface is opened to form a storage space 10a inside.
Further, a male screw 10e is formed on the outer peripheral surface of the top of the side wall
10c of the housing 10, and a circular fitting recess 10d is formed substantially in the center of
the bottom 10b.
[0016]
The lid portion 11 has a cylindrical side wall 11h and an upper portion 11g, and a fixing portion
11a having an L-shaped cross section is formed from the side wall 11f and the outer peripheral
portion of the upper portion 11g. On the inner peripheral surface of the side wall 11f of 11a, a
female screw portion 11f to be screwed to the male screw portion 10e of the housing 10 is
formed. A ring-shaped hinge portion 11c having a triangular cross-section is formed on the top
of the lid 11 except for the fixing portion 11a, and a preload spring 11b biased inward in the
housing 10 is formed. . In addition, a conically pointed force transmitting portion 11d is formed
in a substantially conical shape projecting upward from substantially the center of the upper
portion, and a pressing portion 11e having a shape in which the tip of a conical portion
projecting downward from approximately the central portion of the upper portion is cut away is
formed. . The excitation unit 17 has round bar-shaped giant magnetostrictive elements 17a and
17b divided into two, a magnet 16a for applying a bias magnetic field is disposed on the top
surface of the giant magnetostrictive element 17a, and the giant magnetostrictive element 17a
and giant magnetostrictive A magnet 16b for applying a bias magnetic field is disposed between
the element 17b and the magnet 16c for applying a bias magnetic field on the lower surface of
04-05-2019
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the giant magnetostrictive element 17b. The super magnetostrictive material of the giant
magnetostrictive elements 17a and 17b is an alloy material having Tb (terbium) -Dy
(dysprosium) -Fe (iron) as a central composition. The outside diameters of the giant
magnetostrictive elements 17a and 17b and the magnets 16a to 16c are substantially equalized,
and the resinous tube 18 such as a heat-shrinkable tube is used to make the central axes thereof
not deviate, and the giant magnetostrictive elements 17a and 17b and magnets 16a to 16c The
outer peripheral surface of the is covered and fixed so as to be integrated.
[0017]
The coil portion is wound in a space between the resin bobbin 13 in which ring-shaped flange
portions 13a are formed on the upper and lower sides of the cylindrical portion 13b in which the
through holes 13c are formed, and the flange portion 13a of the bobbin 13 It is composed of a
coil 14. When an alternating current flows through the coil 14, a magnetic field corresponding to
the alternating current is generated substantially along the central axis of the bobbin 13 which is
the central axis of the through hole 13c. The lower part of the disk-like magnet base 15 is fitted
and positioned in the fitting recess 10d formed in the bottom part 10b of the housing 10, and the
magnet which is the lower surface of the excitation part 17 on the upper surface of the magnet
base 15 The lower surface of 16c is adhered. Thereby, the excitation unit 17 is erected in the
storage space 10 a along the central axis of the housing 10. The bobbin 13 in which the coil 14
is wound so that the central axis substantially coincides with the central axis of the excitation
unit 17 is disposed in the storage space, and the lower surface of the bobbin 13 is adhered to the
upper surface of the bottom 10 b of the housing 10 ing. Furthermore, although the disk-shaped
yoke 12 made of a magnetic material is disposed on the excitation portion 17, the upper portion
of the excitation portion 17 is disposed in the positioning recess 12a formed substantially at the
center of the lower surface of the yoke 12. The upper portions of the magnets 16a forming the
are fitted and positioned. In this case, the outer peripheral surface of the yoke 12 faces the inner
peripheral surface of the side wall 10 c of the housing 10 with a slight gap δ.
[0018]
Then, the lid portion 11 is disposed on the housing 10, and the female screw portion 11f of the
lid portion 11 is screwed to the male screw portion 10e of the housing 10 to form a waterproof
structure. Thereby, the lower surface of the pressing portion 11e of the lid portion 11 is biased
downward by the preload spring 11b, and the yoke 12 is biased downward, so that the exciting
portion 17 compresses the super magnetostrictive elements 17a and 17b. Will be preloaded in
the direction. In the giant magnetostrictive vibrator 1 of the first embodiment configured as
04-05-2019
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described above, for example, it is assumed that the coil 14 is driven by the output of an
amplifier that amplifies an audio signal. When the coil 14 is driven, a magnetic field
corresponding to the output of the amplifier is generated along substantially the central axis of
the bobbin 13 and passes through the yoke 12, the side wall 10c and the bottom 10b of the
housing 10 to the exciting unit 17 A magnetic field generated from the coil 14 is applied
substantially along the central axis. As a result, the giant magnetostrictive elements 17 a and 17
b of the excitation unit 17 are displaced so as to expand and contract in accordance with the
applied magnetic field. Therefore, the yoke 12 provided on the excitation unit 17 is displaced up
and down according to the expansion and contraction of the giant magnetostrictive elements 17a
and 17b, and the displacement is received by the pressing unit 11e that urges the yoke 12 The
force transfer unit 11d is displaced according to the output of the amplifier. Therefore, by
bringing the force transfer portion 11d into contact with the soundboard, displacement
according to the output of the amplifier is transmitted to the soundboard, and an acoustic signal
is emitted. That is, the flat speaker is configured by bringing the force transfer portion 11d of the
giant magnetostrictive vibration exciter 1 into contact with, for example, a flat sound board as
shown in FIG.
[0019]
Here, the magnetic field-distortion amount characteristics of the giant magnetostrictive elements
17a and 17b constituting the vibration excitation unit 17 are shown in FIG. As shown in the
graph of FIG. 14, when the applied magnetic field is 0, the distortion amount is almost 0, and
when the applied magnetic field reaches about 500 [Oe], it extends about 980 ppm and the
applied magnetic field Becomes about -500 [Oe] and stretches about 980 ppm. Therefore, a bias
magnetic field Hb of about 200 [Oe], for example, is applied to the giant magnetostrictive
elements 17a and 17b by the magnets 16a to 16c so that the giant magnetostrictive elements
17a and 17b expand and contract by the magnetic field generated from the coil 14. There is. In
this case, the giant magnetostrictive elements 17a and 17b are in a biased state extended by
about 500 ppm. In this bias state, when the periodic alternating current signal Sig is supplied to
the coil 14 and a generated magnetic field is applied to the giant magnetostrictive elements 17a
and 17b, the giant magnetostrictive elements 17a and 17b periodically enter according to the
alternating current signal Sig. It will repeat expansion and contraction. From this, when an
alternating current signal such as a voice signal or a musical tone signal is simultaneously
applied to the coil 14 in the bias state, that is, a state in which a direct current is constantly
supplied to the coil 14, the excitation unit 17 and the force transfer unit 11b Stretch according
to. As a result, the soundboard vibrates and a musical tone or the like is generated. The exciting
section 17 is divided into two giant magnetostrictive elements 17a and 17b, and a bias magnetic
field is applied to the upper surface of the giant magnetostrictive element 17a, between the giant
magnetostrictive element 17a and the giant magnetostrictive element 17b, and the lower surface
04-05-2019
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of the giant magnetostrictive element 17b. The reason for arranging the magnets 16a to 16c is
as follows. The giant magnetostrictive element is a material of high magnetic permeability, and
by dividing it into a plurality and arranging the giant magnetostrictive element and the magnet
for bias alternately, the variation of the bias magnetic field is suppressed by the upper and lower
positions of the giant magnetostrictive element, It can be made constant. In this case, the giant
magnetostrictive element may be divided into two or more.
[0020]
Next, FIG. 3 and FIG. 4 show the structure of the giant magnetostrictive vibrator 2 according to
the second embodiment of the present invention. FIG. 3 (a) is a top view showing the
configuration of the giant magnetostrictive vibration exciter 2 of the second embodiment, and
FIG. 2 (b) is a cross-sectional view of the constitution of the giant magnetostrictive vibration
exciter 2 of the second embodiment It is a front view shown by a figure, FIG. 4: is an exploded
view which shows the structure of each part of the super-magnetostriction vibrator 2 of 2nd
Example. The giant magnetostrictive vibration exciter 2 of the second embodiment shown in
these figures includes a vibrating part 27 composed of a giant magnetostrictive element inside a
waterproof structure composed of a housing 20 made of a magnetic material and a lid 21. A coil
unit for generating a magnetic field in the axial direction of the excitation unit 27 is incorporated.
The housing 20 has a cylindrical side wall portion 20c and a bottom portion 20b, and the upper
surface is opened to form a storage space 20a inside. An external thread 20e is formed on the
outer peripheral surface of the top of the side wall 20c of the housing 20, and a circular fitting
recess 20d is formed substantially in the center of the bottom 20b.
[0021]
The lid portion 21 has a cylindrical side wall 21h and an upper portion 21g, and a fixing portion
21a having an L-shaped cross section and a ring shape is formed from the side wall 21h and the
outer peripheral portion of the upper portion 21g. On the inner peripheral surface of the side
wall 21 h of 21 a, a female screw portion 21 f to be screwed to the male screw portion 20 e of
the housing 20 is formed. A thin disk-like preload spring 21b is fitted in a circular hole on the
upper surface of the fixed portion 21a. The preloading spring 21b is fixed by welding or bonding
in the circular hole of the fixing portion 21a. Alternatively, the preload spring 21 b may be
integrally formed on the lid 21 by cutting the contact portion of the lid 21. The configuration of
the vibration unit 27 and the bobbin 23 around which the coil 24 is wound is the same as the
vibration unit 17 of the giant magnetostrictive vibrator 1 of the first embodiment and the bobbin
13 around which the coil 14 is wound. Therefore, the explanation is omitted. The lower part of
04-05-2019
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the disk-like magnet base 25 is fitted and positioned in the fitting recess 20d formed in the
bottom 20b of the housing 20, and the magnet which is the lower surface of the excitation part
27 on the upper surface of the magnet base 25 The lower surface of 26c is adhered. As a result,
the excitation unit 27 is erected in the storage space 20 a along the central axis of the housing
20. The bobbin 23 in which the coil 24 is wound so that the central axis substantially coincides
with the central axis of the excitation unit 27 is disposed in the storage space, and the lower
surface of the bobbin 23 is adhered to the upper surface of the bottom 20b of the housing 20
ing. Furthermore, a disk-shaped yoke 22 made of a magnetic material is disposed on the
excitation portion 27, and a ring-shaped projection 22 a for positioning is formed so as to
protrude downward substantially from the center of the lower surface of the yoke 22, The upper
part of the magnet 26a which forms the upper part of the excitation part 27 is fitted and
positioned. In this case, the outer peripheral surface of the yoke 22 faces the inner peripheral
surface of the side wall 20c of the housing 20 with a slight gap δ.
[0022]
Then, the lid portion 21 is disposed on the housing 20, and the female screw portion 21f of the
lid portion 21 is screwed to the male screw portion 20e of the housing 20 to form a waterproof
structure. In this case, a disc-shaped pressing portion 21c having a tapered side surface is
bonded to substantially the center of the lower surface of the preload spring 21b, and the
pressing portion 21c is biased downward by the preload spring 21b. Since the yoke 22 is biased
downward, the excitation unit 27 is preloaded in the direction in which the giant
magnetostrictive elements 27a and 27b are compressed. In the magnetostrictive vibration exciter
2 of the second embodiment configured as described above, for example, it is assumed that the
coil 24 is driven by the output of an amplifier that amplifies an audio signal. When the coil 24 is
driven, a magnetic field corresponding to the output of the amplifier is generated along
substantially the central axis of the bobbin 23, passes through the yoke 22, the side wall 20 c
and the bottom 20 b of the housing 20, and A magnetic field generated from the coil 24 is
applied substantially along the central axis. As a result, the giant magnetostrictive elements 27a
and 27b of the excitation unit 27 are displaced so as to expand and contract in accordance with
the applied magnetic field. Therefore, the yoke 22 provided on the excitation unit 27 is displaced
up and down according to the expansion and contraction of the giant magnetostrictive elements
27a and 27b, and the displacement is received by the pressing unit 21c which biases the yoke
22. The preload spring 21b is displaced according to the output of the amplifier. Therefore, by
forming a projection on the outer surface of the preload spring 21b and contacting the flat sound
board, a displacement according to the output of the amplifier is transmitted to the sound board
so that an acoustic signal is emitted. Become. That is, a flat speaker is configured. The magnetic
field-distortion amount characteristics of the giant magnetostrictive elements 27a and 27b
constituting the excitation unit 27 are similar to the characteristics shown in FIG.
04-05-2019
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[0023]
Next, FIG. 5 shows a partial configuration of a modification of the giant magnetostrictive vibrator
1 according to the first embodiment of the present invention. FIG. 5 (a) is a front view showing,
in a cross-sectional view, the configuration of a yoke 12 'of a modification of the giant
magnetostrictive vibrator 1, and FIG. 5 (b) is a combination of the cover 12 with the yoke 12' of
the modification It is a front view showing a cross section of the configuration. As shown in these
figures, a conical recess 12b is formed substantially at the center of the upper surface of the
yoke 12 'of the modification. Then, when the lid portion 11 is disposed on the housing 10 and
the female screw portion 11 f of the lid portion 11 is screwed to the male screw portion 10 e of
the housing 10, the lower portion of the pressing portion 11 e of the lid portion 11 is The yoke
12 'is positioned by being fitted into the conical recess 12b on the upper surface of the yoke 12'.
Thereby, the central axis of the yoke 12 'is aligned with the central axis of the housing 10, and
even if the yoke 12' vibrates up and down by the vibration part 17, the yoke 12 'does not shift
and the outer peripheral surface thereof Contact with the inner peripheral surface of the side
wall 10 c of the housing 10 is prevented.
[0024]
Next, a partial configuration of a modification of the giant magnetostrictive vibration exciter 2
according to the second embodiment of the present invention is shown in FIG. FIG. 6 (a) is a front
view showing, in a cross-sectional view, the configuration of the yoke 22 'of a modification of the
giant magnetostrictive vibrator 2. FIG. 6 (b) is a combination of the yoke 22' of the modification
and the lid 21. It is a front view showing a cross section of the configuration. As shown in these
figures, a fitting portion 22b consisting of a circular recess is formed substantially at the center
of the upper surface of the yoke 22 'of the modification. Then, when the lid 21 is disposed on the
housing 20 and the female screw 21 f of the lid 21 is screwed to the male screw 20 e of the
housing 20, the lower portion of the pressing portion 21 c of the lid 21 is The yoke 22 'is
positioned by being fitted into the fitting portion 22b on the upper surface of the yoke 22'.
Thereby, the central axis of the yoke 22 'is aligned with the central axis of the housing 20, and
even when the yoke 22' is vibrated up and down by the vibration part 27, the yoke 22 'is not
displaced and the outer peripheral surface thereof is The contact with the inner peripheral
surface of the side wall portion 20c of the housing 20 is prevented.
[0025]
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Next, the configuration of the giant magnetostrictive vibration exciter 3 according to the third
embodiment of the present invention is shown in FIGS. 7 and 8. FIG. Fig.7 (a) is a top view which
shows the structure of the super magnetostriction vibration exciter 3 of 3rd Example, FIG.7 (b) is
a c-c cross section of the structure of the super magnetostrictive vibration exciter 3 of 3rd
Example It is a front view shown by a figure, and FIG. 8 is an exploded view which shows the
structure of each part of the super magnetostriction vibrator 3 of 3rd Example. The giant
magnetostrictive vibration exciter 3 of the third embodiment shown in these figures includes a
vibrating part 37 composed of a giant magnetostrictive element inside a waterproof structure
composed of a housing 30 made of a magnetic material and a lid 31. A coil unit for generating a
magnetic field in the axial direction of the excitation unit 37 is incorporated. The housing 30 has
a cylindrical side wall portion 30c and a bottom portion 30b, and the upper surface is opened to
form a storage space 30a inside. An external thread 30e is formed on the outer peripheral
surface of the top of the side wall 30c of the housing 30, and a circular fitting recess 30d is
formed substantially in the center of the bottom 30b.
[0026]
The lid portion 31 has a cylindrical side wall 31h and an upper portion 31g, and a fixing portion
31a having an L-shaped cross section and a ring shape is formed from the side wall 31h and the
outer peripheral portion of the upper portion 31g. On the inner peripheral surface of the side
wall 31 h of 31 a, a female screw portion 31 f to be screwed to the male screw portion 30 e of
the housing 30 is formed. A thin disc-like preload spring 31b is fitted in a circular hole on the
upper surface of the fixed portion 31a. The preloading spring 31b is fixed by welding or bonding
in the circular hole of the fixing portion 31a. Alternatively, the preload spring 31 b may be
formed integrally with the lid 31 by cutting the contact portion of the lid 31. The configuration of
the vibration unit 37 and the bobbin 33 around which the coil 34 is wound is the same as the
vibration unit 17 of the giant magnetostrictive vibrator 1 of the first embodiment and the bobbin
13 around which the coil 14 is wound. Therefore, the explanation is omitted. The lower part of
the disk-like magnet base 35 is fitted and positioned in the fitting recess 30 d formed in the
bottom part 30 b of the housing 30, and the magnet which is the lower surface of the excitation
part 37 on the upper surface of the magnet base 35 The lower surface of 36c is adhered.
Thereby, the excitation unit 37 is erected in the storage space 30 a along the central axis of the
housing 30. The bobbin 33 in which the coil 34 is wound so that the central axis substantially
coincides with the central axis of the excitation unit 37 is disposed in the storage space, and the
lower surface of the bobbin 33 is bonded to the upper surface of the bottom 30 b of the housing
30. ing. Furthermore, although the disk-shaped yoke 32 which consists of a magnetic body is
arrange ¦ positioned on the excitation part 37, the magnet holding ¦ suppressing 32b in which
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the circular engagement recessed part 32c for positioning is formed in the approximate center of
the lower surface of the yoke 32 is formed. Is glued. The upper part of the magnet 36a which
forms the upper part of the excitation part 37 is fitted and positioned in the engagement
recessed part 32c of this magnet holding ¦ suppressing 32b. In this case, the outer peripheral
surface of the yoke 32 faces the inner peripheral surface of the side wall 30 c of the housing 30
with a slight gap δ.
[0027]
Then, the lid portion 31 is disposed on the housing 30, and the female screw portion 31f of the
lid portion 31 is screwed to the male screw portion 30e of the housing 30 to form a waterproof
structure. In this case, an arc-shaped fitting recess 31c is formed substantially at the center of the
lower surface of the preload spring 31b, and an arc-shaped positioning recess 32a is formed on
the top surface of the yoke 32, and the preload spring 31b and the yoke 32 A pressing ball 31d,
which is a spherical body, is interposed therebetween. Thus, the pressing ball 31d is fitted into
the fitting recess 31c and the positioning recess 32a, and the yoke 32 is positioned. Further,
since the pressing ball 31d is biased downward by the preload spring 31b and the yoke 32 is
biased downward, the exciting unit 37 is preloaded in the direction in which the giant
magnetostrictive elements 37a and 37b are compressed. become. In the giant magnetostrictive
vibrator 3 of the third embodiment configured as described above, for example, it is assumed
that the coil 34 is driven by the output of an amplifier that amplifies an audio signal. When the
coil 34 is driven, a magnetic field corresponding to the output of the amplifier is generated along
substantially the central axis of the bobbin 33 and passes through the yoke 32, the side wall 30c
and the bottom 30b of the housing 30, to the excitation unit 37. A magnetic field generated from
the coil 34 is applied substantially along the central axis. As a result, the giant magnetostrictive
elements 37a and 37b of the excitation unit 37 are displaced so as to expand and contract in
accordance with the applied magnetic field. Therefore, the yoke 32 provided on the excitation
unit 37 is displaced up and down according to the expansion and contraction of the giant
magnetostrictive elements 37a and 37b, and the displacement is received by the pressing ball
31d biasing the yoke 32. The preload spring 31b is displaced according to the output of the
amplifier. Therefore, by forming a projection on the outer surface of the preload spring 31b to
abut on a flat sound board, a displacement according to the output of the amplifier is transmitted
to the sound board so that an acoustic signal is emitted. Become. That is, a flat speaker is
configured. The magnetic field-distortion amount characteristics of the giant magnetostrictive
elements 37a and 37b constituting the excitation unit 37 are the same as the characteristics
shown in FIG.
[0028]
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15
Next, the configuration of a super magnetostrictive vibration exciter 4 according to a fourth
embodiment of the present invention is shown in FIG. 9 and FIG. FIG. 9 (a) is a top view showing
the configuration of the giant magnetostrictive vibration exciter 4 of the fourth embodiment, and
FIG. 9 (b) is a cross-sectional view of the constitution of the giant magnetostrictive vibration
exciter 4 of the fourth embodiment. It is a front view shown by a figure, FIG. 10 is an exploded
view which shows the structure of each part of the super magnetostriction vibration exciter 4 of
4th Example. The giant magnetostrictive vibration exciter 4 of the fourth embodiment shown in
these figures includes a vibrating part 47 composed of a giant magnetostrictive element inside a
waterproof structure composed of a case 40 composed of a magnetic body and a lid 41. A coil
unit for generating a magnetic field in the axial direction of the excitation unit 47 is incorporated.
The housing 40 has a cylindrical side wall portion 40c and a bottom portion 40b, and the upper
surface is opened to form a storage space 40a inside. Further, a male screw 40e is formed on the
outer peripheral surface of the upper portion of the side wall 40c of the housing 40, and a
circular fitting recess 40d is formed substantially in the center of the bottom 40b.
[0029]
The lid portion 41 has a cylindrical side wall 41h and an upper portion 41g, and a fixing portion
41a having an L-shaped cross section and a ring shape is formed from the side wall 41h and the
outer peripheral portion of the upper portion 41g. On the inner peripheral surface of the side
wall 41 h of 41 a, a female screw portion 41 f to be screwed to the male screw portion 40 e of
the housing 40 is formed. A thin disc-like preload spring 41b is fitted in a circular hole on the
upper surface of the fixed portion 41a. The preloading spring 41b is fixed by welding or bonding
in the circular hole of the fixing portion 41a. Alternatively, the preloading spring 41 b may be
integrally formed on the lid 41 by cutting the contact portion of the lid 41. The configuration of
the vibration unit 47 and the bobbin 43 around which the coil 44 is wound is the same as that of
the vibration unit 17 of the giant magnetostrictive vibrator 1 of the first embodiment and the
bobbin 13 around which the coil 14 is wound. Therefore, the explanation is omitted. The lower
part of the disk-like magnet base 45 is fitted and positioned in the fitting recess 40 d formed in
the bottom part 40 b of the housing 40, and the magnet which is the lower surface of the
excitation part 47 on the upper surface of the magnet base 45 The lower surface of 46c is
bonded. Thereby, the excitation unit 47 is erected in the storage space 40 a along the central axis
of the housing 40. The bobbin 43 in which the coil 44 is wound so that the central axis
substantially coincides with the central axis of the excitation unit 47 is disposed in the storage
space, and the lower surface of the bobbin 43 is bonded to the upper surface of the bottom 40 b
of the housing 40 ing. Furthermore, although the disk-shaped yoke 42 which consists of
magnetic bodies is arrange ¦ positioned on the excitation part 47, the magnet holding ¦
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suppressing 42b by which the circular engagement recessed part 42c for positioning is formed
in the approximate center of the lower surface of the yoke 42 is formed. Is glued. The upper part
of the magnet 46a which forms the upper part of the excitation part 47 is fitted and positioned in
the engagement recessed part 42c of this magnet holding ¦ suppressing 42b. In this case, the
outer peripheral surface of the yoke 42 faces the inner peripheral surface of the side wall portion
40 c of the housing 40 with a slight gap δ.
[0030]
Then, the lid portion 41 is disposed on the housing 40, and the female screw portion 41f of the
lid portion 41 is screwed to the male screw portion 40e of the housing 40 to form a waterproof
structure. In this case, a circular fitting hole 41c is formed substantially at the center of the lower
surface of the preload spring 41b, and an arc-shaped positioning recess 42a is formed on the
upper surface of the yoke 42, and between the preload spring 41b and the yoke 42. There is
interposed a pressing ball 41d formed into a spherical shape. Thereby, the pressing ball 41d is
fitted into the fitting hole 41c and the positioning recess 42a, and the yoke 42 is positioned. The
upper portion of the pressing ball 41d protrudes upward from the fitting hole 41c, and the
pressing ball 41d is biased downward by the preload spring 41b to bias the yoke 42 downward.
47 are preloaded in the direction in which the giant magnetostrictive elements 47a and 47b are
compressed.
[0031]
In the magnetostrictive vibration exciter 4 of the fourth embodiment configured as described
above, for example, it is assumed that the coil 44 is driven by the output of an amplifier that
amplifies an audio signal. When the coil 44 is driven, a magnetic field corresponding to the
output of the amplifier is generated along substantially the central axis of the bobbin 43, passes
through the yoke 42, the side wall 40c and the bottom 40b of the housing 40, and A magnetic
field generated from the coil 44 is applied substantially along the central axis. As a result, the
giant magnetostrictive elements 47a and 47b of the excitation unit 47 are displaced so as to
expand and contract in accordance with the applied magnetic field. Therefore, the yoke 42
provided on the excitation unit 47 is displaced up and down according to the expansion and
contraction of the giant magnetostrictive elements 47a and 47b, and the displacement is received
by the pressing ball 41d biasing the yoke 42. The preload spring 41b is displaced according to
the output of the amplifier. Therefore, by pressing the pressing ball 41d projecting upward from
the preload spring 31b into contact with the flat sound board, displacement according to the
output of the amplifier is transmitted to the sound board and the acoustic signal is emitted. It will
04-05-2019
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be. That is, a flat speaker is configured. The magnetic field-distortion amount characteristics of
the giant magnetostrictive elements 47a and 47b constituting the excitation unit 47 are similar
to the characteristics shown in FIG.
[0032]
Next, FIG. 11 shows the configuration of a modification of the lid in the giant magnetostrictive
vibrator according to the embodiment of the present invention. 11 (a) is a top view showing the
configuration of the lid 51 of the modification, FIG. 11 (b) is a front view showing the
configuration of the lid 51 of the modification in a sectional view, and FIG. FIG. 7 is a bottom
view showing the configuration of a lid 51. The lid 51 shown in FIGS. 11 (a) to 11 (c) can be used
as the lid 21 of the giant magnetostrictive vibrator of the second embodiment or the lid 31 of the
giant magnetostrictor 3 of the third embodiment. it can. The lid 51 has a cylindrical side wall 51h
and an upper portion 51g, and a fixing portion 51a having an L-shaped cross section and a ring
shape is formed from the side wall 51h and the outer peripheral portion of the upper portion
51g. On the inner peripheral surface of the side wall 51h of 51a, a female screw portion 51f to
be screwed to the screw portion of the housing is formed. A thin disk-like preload spring 51b is
fitted in a circular hole on the upper surface of the fixed portion 51a. The preloading spring 51b
is fixed by welding or bonding in the circular hole of the fixing portion 51a. Alternatively, the
preload spring 51 b may be integrally formed on the lid 51 by cutting the contact portion of the
lid 51. Further, a force transmission portion 51c is provided which protrudes upward
substantially from the center of the upper surface of the preload spring 51b. The force
transmitting portion 51c is in the form of a thin round bar having a screw hole 51d formed
therein. Then, by screwing a screw inserted into the sounding board into the screw hole 51d, the
giant magnetostrictive vibrator having the lid 51 is attached to the sounding board. Thereby,
when the super magnetostrictive vibrator is driven by the output of the amplifier, the force
transmitting portion 51c of the preload spring 51b displaced according to the output of the
amplifier causes the displacement according to the output of the amplifier to the soundboard. It
is transmitted and an acoustic signal is emitted.
[0033]
Next, FIG. 12 shows the structure of the giant magnetostrictive vibration exciter 6 according to a
fifth embodiment of the present invention. FIG. 12 (a) is a top view showing the configuration of
the giant magnetostrictive vibration exciter 6 of the fifth embodiment, and FIG. 12 (b) is a
sectional view showing the configuration of the giant magnetostrictive vibration exciter 6 of the
fifth embodiment. It is a front view, FIG.12 (c) is a top view which shows the structure of each
04-05-2019
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part of the super magnetostriction vibration exciter 6 of 5th Example by ff sectional drawing. The
giant magnetostrictive vibration exciter 6 of the fifth embodiment shown in these figures is
provided with a magnetic case 60, and the case 60 has a cylindrical side wall 60c and a bottom
60b, and the upper surface is It is opened and a storage space is formed inside. In this storage
space, a vibrating portion composed of super magnetostrictive elements 67a and 67b and
magnets 66a, 66b and 66c, a coil 64 for generating a magnetic field in the axial direction of the
vibrating portion, and a bobbin 63 around which the coil 64 is wound. And are built-in. The
structure of the vibration portion and the bobbin 63 around which the coil 64 is wound is the
same as the vibration portion 17 of the giant magnetostrictive vibration exciter 1 of the first
embodiment and the bobbin 13 around which the coil 14 is wound. Therefore, the explanation is
omitted.
[0034]
The lower portion of the disk-like magnet base 65 is fitted and positioned in the fitting recess
formed in the bottom 60 b of the housing 60, and the lower surface of the magnet 66 c is
adhered to the upper surface of the magnet base 65. Thus, the vibration excitation unit is
incorporated in the housing 60 along the central axis of the housing 60. A bobbin 63 on which
the coil 64 is wound so that the central axis substantially coincides with the central axis of the
vibration excitation unit is disposed in the housing 60, and the lower surface of the bobbin 63 is
adhered to the upper surface of the bottom 60b of the housing 60. ing. Furthermore, a diskshaped yoke 62 made of a magnetic material is disposed on the magnet 66 a, and the magnet 66
a is bonded to substantially the center of the lower surface of the yoke 62. In this case, the outer
diameter of the yoke 62 is substantially equal to the outer diameter of the side wall 60c, and the
upper end surface of the side wall 60c faces the outer periphery of the lower surface of the yoke
62 with a slight gap.
[0035]
In the magnetostrictive vibration exciter 6 of the fifth embodiment configured as described
above, for example, it is assumed that the coil 64 is driven by the output of an amplifier that
amplifies an audio signal. When the coil 64 is driven, a magnetic field corresponding to the
output of the amplifier is generated substantially along the central axis of the bobbin 63 and
passes through the yoke 62, the side wall 60c and the bottom 60b of the housing 60, and the
giant magnetostrictive element 67a, A magnetic field generated from the coil 64 is applied
substantially along the central axis to the excitation portion provided with 67b. As a result, the
giant magnetostrictive elements 67a and 67b of the excitation unit are displaced so as to expand
04-05-2019
19
and contract in accordance with the applied magnetic field. Therefore, the yoke 62 bonded onto
the vibrating portion is displaced up and down according to the expansion and contraction of the
giant magnetostrictive elements 67a and 67b. Therefore, by providing a projection projecting
upward from the upper surface of the yoke 62 and bringing this projection into contact with a
flat sound board, displacement according to the output of the amplifier is transmitted to the
sound board, and an acoustic signal is produced. Will be emitted. That is, a flat speaker is
configured. Note that the magnetic field-distortion amount characteristics of the giant
magnetostrictive elements 67a and 67b constituting the excitation unit are similar to the
characteristics shown in FIG.
[0036]
Next, FIG. 13 is a front view showing, in a cross-sectional view, the configuration of a giant
magnetostrictive vibration exciter 6 'according to a modification of the fifth embodiment of the
present invention. The giant magnetostrictive vibration exciter 6 'according to the modification of
the fifth embodiment differs in the configuration of the side wall 60c' of the housing 60 'as
shown in FIG. 13, and the upper portion of the cylindrical side wall 60c' is the inner side. The
ring-shaped bent portion 60d is formed. As a result, since the yoke 62 and the bent portion 60 d
face each other, the facing area between the housing 60 ′ and the yoke 62 is increased. Further,
since the bending portion 60d is provided between the yoke 62 and the bobbin 63 ', the height of
the bobbin 63' and the height of the coil 64 'wound around the bobbin 63' are different from
each other. It is lowered by the thickness of. Then, for example, when the coil 64 is driven by the
output of an amplifier for amplifying an audio signal, a magnetic field corresponding to the
output of the amplifier is generated substantially along the central axis of the bobbin 63 '. The
magnetic field generated from the coil 64 'is applied substantially along the central axis to the
excitation portion provided with the super magnetostrictive elements 67a and 67b through the
bent portion 60d' and the side wall portion 60c 'and the bottom portion 60b of .
[0037]
Next, FIG. 15 shows the configuration of a first flat speaker 7 to which the giant magnetostrictive
vibration exciter 1 according to the first embodiment of the present invention is applied, and the
configuration of a fixture 71 for attaching the giant magnetostrictive vibration absorber 1 is
shown. It is shown in 16. Fig.15 (a) is a front view which shows the structure of the 1st plane
speaker 7, FIG.15 (b) is a bottom view which shows the structure of the 1st plane speaker 7,
FIG.15 (c) is FIG. It is the A section enlarged view in (a). 16 (a) is a front view showing the
configuration of the fixture 71, FIG. 16 (b) is a top view showing the configuration of the fixture
04-05-2019
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71, and FIG. 16 (c) shows the configuration of the fixture It is a bottom view. As shown in FIGS.
15 (a) to 15 (c), the first flat speaker 7 is provided with a rectangular elongated sound board 70,
and on the left and right sides of the back of the sound board 70, the first embodiment of the
present invention will be described. The magnetostrictive vibrator 1 is attached by a fixture 71
and configured. As shown in FIGS. 16A to 16C, the mounting tool 71 has a cylindrical side 71b
formed around a circular bottom 71c in which the through hole 71d is formed, and the tip of the
side 71b is A ring-shaped flange portion 71a is formed on the side wall. The diameter of the
through hole 71 d is slightly larger than the outer diameter of the case 10 of the giant
magnetostrictive vibration exciter 1 and is set to a diameter that allows the giant
magnetostrictive vibration vibrator 1 to be inserted. Further, for example, four insertion holes
71e are formed at equal intervals in the collar portion 71a, and the fixing screw 72 is fixed to the
insertion hole 71e in a state where the casing 10 of the super magnetostrictive vibration exciter
1 is inserted into the through hole 71d. Are each screwed to the soundboard 70, whereby the
giant magnetostrictive vibrator 1 is attached to the soundboard 70. In this case, the tip of the
force transfer portion 11 d of the giant magnetostrictive vibration exciter 1 abuts on the
soundboard 70. In addition, a ring-shaped urethane rubber 73 is interposed between the flange
portion 71 a of the fixture 71 and the sound board 70 so that the vibration of the sound board
70 is not directly transmitted to the case 10 of the super magnetostrictive vibrator 1. It is done.
[0038]
Next, FIG. 17 shows the configuration of a second flat speaker 8 to which the giant
magnetostrictive vibration exciter 1 according to the first embodiment of the present invention is
applied. FIG. 17A is a front view showing the configuration of the second flat speaker 8, and FIG.
17B is a bottom view showing the configuration of the lower surface of the giant
magnetostrictive vibrator 1. The second flat speaker 8 can be provided on the main body 83
serving as a shelf of an electronic keyboard instrument or the like, and the rectangular elongated
soundboard 70 constituting the flat speaker 8 is disposed on the main body 83 at a
predetermined interval. ing. The giant magnetostrictive vibrator 1 disposed on the left and right
of the sounding board 70 is attached by a mount 80 such that the force transmitting portion 11d
abuts on the lower surface of the sounding board 70. The mounting table 80 is fixed to the main
body 83 by screwing a mounting screw 81 which is inserted into a portion having an inverted Ushape and a base bent in an L-shape into the main body 83. The giant magnetostrictive vibrator 1
is disposed on the upper surface of the central portion of the mount 80, and the giant
magnetostrictive vibrator 1 is attached to the mount 80 by a fixing screw 82. In this case, for
example, three screw holes 19 are formed in the bottom portion 10b of the giant
magnetostrictive vibration exciter 1 according to the first embodiment of the present invention
applied to the second flat speaker 8 as shown in FIG. 17 (b). Are formed at equal intervals, and
the super magnetostrictive vibration exciter 1 is attached to the mount 80 by screwing the fixing
04-05-2019
21
screws 82 inserted into the mount 80 into the screw holes 19 respectively. In the second flat
speaker 8, since the giant magnetostrictive vibration exciter 1 is attached to the main body 83 by
the mount 80, the vibration of the soundboard 70 is not transmitted to the housing 10 of the
giant magnetostrictive vibration exciter 1. .
[0039]
Next, a front view showing a part of the configuration of a third flat speaker 9 to which the super
magnetostrictive vibration exciter 1 according to the first embodiment of the present invention is
applied is shown in FIG. The third flat speaker 9 has a rectangular elongated sound board 70,
and the super magnetostrictive vibrator 1 according to the first embodiment of the present
invention is attached to the left and right of the back surface of the sound board 70 by a
mounting plate 90, respectively. FIG. 18 shows a partial configuration in which one super
magnetostrictive vibrator 1 is attached by a mounting plate 90 having a spring property. As
illustrated, the force transmission portion 11 d of the giant magnetostrictive vibration exciter 1 is
attached by a mounting plate 90 so as to abut on the lower surface of the sound board 70. The
mounting plate 90 is an elongated plate, and a flat plate-like portion for supporting the giant
magnetostrictive vibration exciter 1 is formed at the center, and both sides of the flat plate-like
portion are formed on inclined surfaces facing obliquely upward. The tip of is formed in a flat
plate shape. The fixing screw 92 inserted into the flat plate-like portion at the center of the
mounting plate 90 is screwed into the screw hole 19 formed in the bottom portion 10 b of the
giant magnetostrictive vibrator 1 so that the giant magnetostrictive vibrator 1 is attached The
fixing screw 91 is inserted into the flat plate-like portion at the tip of the slope of the mounting
plate 90 and screwed to the sounding plate 70. In the third flat speaker 9, the position of the
sounding board 70 on which the force transfer portion 11d of the giant magnetostrictive vibrator
1 acts is separated from the position of the sounding board 70 to which the mounting plate 90 is
attached. Even if the giant magnetostrictive vibrator 1 is attached to the plate 70, the
transmission of vibration to the soundboard 70 is efficiently performed from the giant
magnetostrictive vibrator 1.
[0040]
Although the giant magnetostrictive vibrator 1 according to the first embodiment of the present
invention is applied as the giant magnetostrictive vibrator in each of the above-described first to
third flat speakers 7 to 9, the present invention is not limited to this. The giant magnetostrictive
vibrators 2 to 4 and 6 of the embodiments 5 to 5 can be applied. At the time of application, it is
preferable to adopt the lid 51 shown in FIG. 11 in the giant magnetostrictive vibrators 2 and 3 of
04-05-2019
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the second and third embodiments, and the giant magnetostrictive vibrator 6 of the fifth
embodiment In the second embodiment, a protrusion for transmitting the displacement
protruding from the upper surface of the yoke 42 is provided. Further, the number of super
magnetostrictive vibrators attached to the sound board 70 can be any number. The abovedescribed first to third flat speakers 7 to 9 can be applied to an electronic keyboard instrument
having a soundboard. For example, the soundboard 35 in the electronic keyboard instrument
described in JP-A-2010-145601 can be adopted as the soundboard 70 in the first flat speaker 7
to the third flat speaker 9.
[0041]
In the giant magnetostrictive vibration exciter according to the embodiment of the present
invention described above, the cross-sectional shape is circular, but the present invention is not
limited thereto and is an elliptical cross-sectional shape or a polygonal cross-sectional shape such
as a rectangle. As well. In addition, although the giant magnetostrictive vibrator of the
embodiment of the present invention can be used as a conversion unit for converting an audio
signal in a flat speaker into mechanical vibration, the present invention is not limited to this, and
underground exploration, ocean tomography The present invention can be applied to any
application such as a sound generator such as sonar, an actuator of a fuel injection nozzle, an
actuator for autofocusing of a camera, and a micropositioner for driving a mirror for observing
planets and satellites.
[0042]
1 to 4 and 6 giant magnetostrictive vibrators, 2 giant magnetostrictive vibrators, 7 flat speakers,
8 flat speakers, 9 flat speakers, 10 casings, 10 a storage space, 10 b bottom, 10 c side wall, 10 d
fitting recess, DESCRIPTION OF SYMBOLS 10 e male screw part, 11 lid part, 11 a fixing part, 11
b preload spring, 11 c hinge part, 11 d force transmission part, 11 e pressing part, 11 f female
screw part, 11 h side wall, 11 g upper part, 12 yoke, 12 a recessed part, 12 b cone Recesses, 13
bobbins, 13a ridges, 13b cylindrical portions, 13c tips, 13c through holes, 14 coils, 15 magnets,
16a to 16c magnets, 17 excitation portions, 17a, 17b super magnetostrictive elements, 18 tubes,
19 screws 20 case, 20a storage space, 20b bottom, 20c side wall, 20d fitting recess, 20e male
thread, 21 lid, 21a fixing portion, 21b Spring for loading, 21c pressing part, 21f female screw
part, 21h side wall, 21g upper part, 22 yoke, 22a ring shaped protrusion, 22b fitting part, 23
bobbin, 24 coil, 25 magnet stand, 26a to 26c magnet, 27 excitation Part, 27a, 27b Super
magnetostrictive element, 30 case, 30a storage space, 30b bottom part, 30c side wall part, 30d
fitting recess, 30e male thread, 31 lid part, 31a fixing part, 31b preload spring, 31c fitting
Recess, 31d pressing ball, 31f internal thread, 31h side wall, 31g top, 32 yoke, 32a recess, 32b
magnet press, 32c engagement recess, 33 bobbin, 34 coil, 35 magnet stand, 36a magnet, 36c
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magnet, 37 Vibration part, 37a, 37b super magnetostrictive element, 40 case, 40a storage space,
40b bottom part, 40c side wall part, 40d fitting recess, 4 e Male thread part, 41 lid part, 41a
fixing part, 41b preload spring, 41c fitting hole, 41d pressing ball, 41f female thread part, 41h
side wall, 41g upper part, 42 yoke, 42a recessed part, 42b magnet pressed, 42c engaged
Coupling recess, 43 bobbin, 44 coil, 45 magnet base, 46a to 46c magnet, 47 excitation part, 47a,
47b super magnetostrictive element, 51 cover part, 51a fixing part, 51b spring for preload, 51c
force transmission part, 51d screw Hole, 51f internal thread, 51h sidewall, 51g top, 60 case, 60b
bottom, 60c sidewall, 60d bend, 62 yoke, 63 bobbin, 64 coil, 65 magnet stand, 66a to 66c
magnet, 67a, 67b Super magnetostrictive element, 70 sound board, 71 fixture, 71a ridge, 71b
side, 71c bottom, 71d through hole, 71e insertion hole, 72 fixed Screws, 73 urethane rubber, 80
mounts, 81 mounting screws, 82 fixing screws, 83 main body, 90 mounting plate, 91 mounting
screws, 92 fixing screws, 100 giant magnetostrictive actuators, 111 giant magnetostrictive
elements, 112 coils, 113 shafts, 113a Body, 113b ridge, 113c tip, 113d end face, 114 yoke, 115
case, 115a guide hole, 116a magnetic body, 116b permanent magnet, 117 spring, 200 giant
magnetostrictive speaker, 203 housing, 204 giant magnetostrictive rod, 205 magnetic field
Generating coil, 206 Bias magnetic field generating magnet, 207 Disc yoke, 208 annular yoke,
209 movable yoke, 209a bolt portion, 210 actuator rod, 210a bolt portion, 210b nut, 212
diaphragm, 212a mounting disc, 213 outside Tube, 213 , 214 leaf spring, 215 outer cylinder,
216 prestress adjustment screw, 217 bolt
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