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JP2010081329

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DESCRIPTION JP2010081329
An object of the present invention is to provide a magnetostrictive speaker which can be used for
a long time even under a domestic poor environment. A magnetostrictive actuator comprising a
resin and a magnetic material and transmitting vibration due to the magnetostriction
phenomenon, and a resin or a metal, wherein the upper surface is coupled to the lower surface of
the magnetostrictive actuator, and the vibration transmitted from the magnetostrictive actuator
is sounded. Plate 202 made of resin or metal, and the outer peripheral portion is coupled to the
diaphragm 202, and the central portion 203a presses the upper surface of the magnetostrictive
actuator 201 to seal the magnetostrictive actuator 201 together with the diaphragm 202. And
[Selected figure] Figure 3
Magnetostrictive speaker and household appliances, electronic devices, mobile objects and
buildings equipped with the same
[0001]
The present invention relates to a magnetostrictive speaker, and in particular, a magnetostrictive
speaker mounted on a household appliance such as a rice cooker or a washing machine, an
electronic device such as a laptop computer, a moving object such as a car or a motorbike, or a
building such as a ceiling or a wall. On the structure of
[0002]
In recent years, household appliances and electronic devices equipped with a voice guidance
function are increasing from the viewpoint of universal design.
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1
Along with this, in addition to the miniaturization that can be incorporated in the device, there is
a demand for the speaker that reproduces the voice guidance to have high durability
performance against inferior environment in the home such as heat, water, and dust.
[0003]
A conventional speaker for voice guidance will be described using the drawings.
[0004]
FIG. 11 is a cross-sectional view showing the configuration of a conventional small speaker for
voice guidance.
[0005]
As shown in FIG. 11, the speaker 100 includes a frame 101, a yoke 102 mounted on the frame
101, a magnet 103 coupled to the yoke 102, and a plate 104 coupled to an upper surface of the
magnet 103. A coil bobbin 105 disposed in a magnetic gap provided between the yoke 102 and
the plate 104, a voice coil 106 wound around the coil bobbin 105, and a damper 107 coupled to
the frame 101 and the coil bobbin 105. , A diaphragm 108 coupled to the coil bobbin 105, an
edge 109 coupled to the diaphragm 108 and the frame 101, and a dust cap 110 coupled to the
diaphragm 108.
[0006]
In order to enhance the waterproofness, the speaker 100 has a diaphragm 108 and a dust cap
110 subjected to surface treatment with a fluorine-based resin (see, for example, Patent
Document 1 below).
JP 2007-60725 A
[0007]
However, conventional speakers are often configured to include materials such as cloth and
04-05-2019
2
paper, and even if waterproofness is enhanced with a fluorine-based resin or the like, heat
resistance does not increase, and vibrations made of cloth or paper are also made. There is a
problem that it is difficult to use for a long time because there is aged deterioration of the system
parts.
Furthermore, when dust is mixed in the magnetic gap, it causes abnormal noise, so there is a
problem that the durability is poor when built in equipment installed for a long time under the
poor environment of home such as water, heat and dust. Also have.
[0008]
An object of the present invention is to provide a magnetostrictive speaker that can be used for a
long time even under a domestic poor environment.
[0009]
The magnetostrictive speaker according to the present invention comprises a magnetostrictive
actuator for transmitting vibration by a magnetostrictive phenomenon, and a resin or metal
diaphragm, the upper surface of which is coupled to the lower surface of the magnetostrictive
actuator to convert the vibration transmitted from the magnetostrictive actuator into sound. And
an elastic body made of resin or metal and having an outer peripheral portion coupled to the
diaphragm and a central portion pressing an upper surface of the magnetostrictive actuator to
seal the magnetostrictive actuator together with the diaphragm. Do.
[0010]
According to the present invention, a non-durable material such as paper or cloth is not used,
and the magnetostrictive actuator is fixed in a space formed by an elastic body made of resin or
metal and a diaphragm, and also from outside space Since it is shut off, it is possible to realize a
high durability performance to a domestic poor environment and a speaker with less failure in
long-term use.
[0011]
Embodiment 1 Hereinafter, a magnetostrictive speaker according to Embodiment 1 of the
present invention will be described with reference to the drawings.
[0012]
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FIG. 1 is a perspective view of a magnetostrictive speaker according to a first embodiment of the
present invention.
FIG. 2 is a front view of the magnetostrictive speaker in FIG. 1 as viewed in the direction of arrow
A. FIG.
FIG. 3 is a cross-sectional view of the magnetostrictive speaker in FIG. 1 as viewed from the
direction of arrow A along the line B-B '(hereinafter the cross-sectional view as viewed from this
direction unless otherwise mentioned Means a cross section of
[0013]
As shown in FIGS. 1 to 3, the magnetostrictive speaker 200 includes a magnetostrictive actuator
201, a diaphragm 202 which covers and presses the magnetostrictive actuator 201, and a leaf
spring 203 as an elastic body which covers and presses the magnetostrictive actuator 201. And
The magnetostrictive actuator 201 is made of a resin such as an elastomer, a magnet, and a
magnetic material such as iron.
The diaphragm 202 is formed of, for example, a flat diaphragm.
Further, the diaphragm 202 is formed of a hard resin or metal so as to be usable for a long time
in a home environment. In the present embodiment, a plate spring is used as the elastic body, but
instead of the plate spring, another elastic body such as rubber may be used.
[0014]
As shown in FIG. 3, the magnetostrictive actuator 201 includes a magnetostrictive element 204, a
coil bobbin 205 coupled to the magnetostrictive element 204, a voice coil 206 wound around the
coil bobbin 205, a bias magnet 207, and a vibration absorbing material. 208, a vibration
transmitting portion 209, and a bias magnet 207, a vibration absorbing material 208, and a yoke
210 coupled to the vibration transmitting portion 209.
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[0015]
The magnetostrictive element 204 is configured as a solid rod-like body.
It causes dimensional change according to the magnitude of the external magnetic field, and is
made of a ferromagnetic material such as nickel, cobalt, or iron, or an alloy based thereon. The
magnetostrictive actuator 201 is a device that uses the vibration generated by the dimensional
change of the magnetostrictive element 204 as a drive source. The magnetostrictive element 204
is particularly preferably a supermagnetic material composed of an alloy of iron (Fe) and a rare
earth such as terbium (Tb) or dysprosium (Dy). When such a supermagnetic material is used, the
magnetostrictive element 204 is called a giant magnetostrictive element, and the
magnetostrictive actuator 201 is called a giant magnetostrictive actuator. When the
magnetostrictive element 204 is pressurized, the amount of magnetostriction and the
permeability change.
[0016]
The coil bobbin 205 is made of a nonmagnetic material such as resin, and includes a cylindrical
portion and upper and lower flange portions. The upper flange portion of the coil bobbin 205 is
coupled to the yoke 210. The coil bobbin 205 may or may not be coupled to the side surface of
the magnetostrictive element 204 at the inner periphery of the cylindrical portion. The voice coil
206 is wound around the outer periphery of the cylindrical portion of the coil bobbin 205.
[0017]
The bias magnet 207 is configured in a ring shape to provide the magnetostrictive element 204
with a bias magnetic field. The vibration absorbing material 208 is made of a ring-shaped rubber
or a resin that absorbs vibrations such as a spring. Therefore, since the vibration absorbing
material 208 suppresses unnecessary vibration, the magnetostrictive speaker 200 can perform
an operation faithful to the input signal. The vibration transfer unit 209 is made of an optimal
resin or metal according to the material of the diaphragm 202, and can control the sound quality.
The lower surface of the vibration transfer unit 209 is coupled to the upper surface of the
diaphragm 202.
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[0018]
The yoke 210 is made of a magnetic material, and includes a substantially disc-shaped lid portion
210a, a substantially disc-shaped first bottom portion 210b, and a substantially ring-shaped
second bottom portion 210c. The yoke 210 guides the magnetic flux generated by the bias
magnet 207 to the magnetostrictive element 204.
[0019]
The lower surface on the center side of the lid portion 210 a is coupled to the upper surface of
the magnetostrictive element 204. The lower surface on the outer peripheral side of the lid
portion 210 a is coupled to the upper surface of the bias magnet 207.
[0020]
The top surface of the first bottom 210 b is coupled to the bottom surface of the
magnetostrictive element 204. The side surface of the first bottom portion 210 b is coupled to
the inner periphery of the vibration absorbing material 208. The first bottom 210 b is held by
the vibration absorbing material 208 at the center position in the lateral direction of the first
bottom 210 b. The lower surface of the first bottom portion 210 b is coupled to the upper
surface of the vibration transmission portion 209.
[0021]
The upper surface of the second bottom 210 c is coupled to the lower surface of the bias magnet
207. The inner periphery of the second bottom portion 210 c is coupled to the outer periphery
of the vibration absorbing material 208. The vibration absorbing material 208 is provided by a
flange provided on the upper surface side of the first bottom portion 210b and protruding in the
outer diameter direction and a flange provided on the lower surface side of the second bottom
portion 210c and protruding in the center direction. There is a step. The two flanges increase the
contact area between the vibration absorbing material 208 and the first bottom 210b and the
second bottom 210c. Therefore, the bonding strength between the vibration absorbing material
208 and the first bottom 210b and the second bottom 210c can be increased.
04-05-2019
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[0022]
The diaphragm 202 is configured in a flat plate shape. In the present embodiment, the
diaphragm 202 is formed in a disk shape. The planar shape of the diaphragm 202 may be any
shape such as a triangle or a square. In order to disperse resonance generated in the diaphragm
202 and obtain flat frequency characteristics, it is desirable that the planar shape of the
diaphragm 202 be asymmetric. Here, that the planar shape of the diaphragm 202 is
asymmetrical means that when the diaphragm 202 is rotated 180 ° from the center (drive
center) of the magnetostrictive element 204, the same planar shape is not obtained. It connects
with the vibration transmission part 209 in the upper surface of center side, and connects with
the leaf | plate spring 203 in the upper surface of outer peripheral side.
[0023]
The leaf spring 203 is provided with a central portion 203a whose central side is raised and an
outer peripheral portion 203b whose outer peripheral side is flat. The central portion 203a is
recessed near its center than its surroundings. Then, the upper surface of the lid portion 210a is
pressed by the lower surface of the recessed portion.
[0024]
This point will be described in detail with reference to FIG. FIG. 4A is a cross-sectional view
showing the state of the magnetostrictive speaker 200 before the diaphragm 202 and the plate
spring 203 are coupled. FIG. 4B is a cross-sectional view showing the state of the
magnetostrictive speaker 200 after the diaphragm 202 and the plate spring 203 are coupled. As
shown in FIG. 4A, the leaf spring 203 before being coupled to the diaphragm 202 is not applied
with a restoring force. There is a gap between the leaf spring 203 and the diaphragm 202. As
shown in FIG. 4 (a), the outer peripheral portion 203b of the plate spring 203 is pulled
downward from the state before the diaphragm 202 and the plate spring 203 are coupled, and is
shown in FIG. 4 (b). Thus, the diaphragm 202 and the plate spring 203 are coupled. At this time,
a restoring force acts on the leaf spring 203, as shown in FIG. 4A, for returning to the original
state where the restoring force is not applied. As a reaction of this restoring force, a force is
applied downward to the central portion 203a of the plate spring 203, and a compressive stress
is continuously applied to the lid portion 210a of the magnetostrictive actuator 201 fixed to the
04-05-2019
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central portion 203a of the plate spring 203.
[0025]
Moreover, since the external force for applying a suitable pressure becomes small, so that the
contact area of center part 203a and lid part 210a is small, it is possible to suppress a failure in
which leaf spring 203 is deformed beyond the elastic limit.
[0026]
When an AC signal is externally applied to the voice coil 206, the magnetostrictive element 204
undergoes dimensional change in the vertical direction.
The AC signal applied to the voice coil 206 is adjusted so that the dimensional change of the
magnetostrictive element 204 falls within the elastic limit of the leaf spring 203. In addition, a
magnetic field of bias is applied to the magnetostrictive element 204 in advance. Therefore, the
magnetostrictive element 204 can change in size both in the extending direction and in the
contracting direction, and can vibrate the diaphragm 202 to output sound. Further, when the
central portion 203a and the lid portion 210a are joined at one point and the magnetostrictive
actuator 201 is pressed, the compressive stress on the plate spring 203 becomes large, and the
amount of magnetostriction due to the magnetostriction phenomenon can be increased. The
center portion 203a may be coupled to the upper surface of the lid portion 210a at the lower
surface to press the magnetostrictive actuator 201, and may not be pressed at one point. An
adhesive is applied to the entire lower surface of the outer peripheral portion 203 b and is
bonded to the entire upper surface on the outer peripheral side of the diaphragm 202.
[0027]
As described above, the magnetostrictive actuator 201 is sealed and pressed by the diaphragm
202 and the plate spring 203, and an appropriate compressive stress is continuously applied to
the magnetostrictive element 204 inside. As a result, the magnetostrictive speaker 200 can
further increase the amount of magnetostriction due to the magnetostriction phenomenon of the
magnetostrictive element 204, and a large stroke can be taken when an external magnetic field is
applied, so that a louder sound than usual is generated. It becomes possible.
04-05-2019
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[0028]
Further, the magnetostrictive speaker 200 protects the magnetostrictive actuator 201 from dust,
water, temperature and the like even in a poor environment in the home because the
magnetostrictive actuator 201 is sealed by the diaphragm 202 and the plate spring 203 made of
metal or resin. Also, long-term use can prevent failure. Therefore, the acoustic performance of
the magnetostrictive speaker can be enhanced, and the endurance performance can be enhanced.
Such a magnetostrictive speaker is particularly suitable for voice guidance of household
appliances such as a rice cooker and a washing machine, which are greatly affected by dust,
water, temperature and the like.
[0029]
Second Embodiment Hereinafter, a magnetostrictive speaker 300 according to a second
embodiment of the present invention will be described with reference to the drawings. The same
parts as those of the first embodiment are designated by the same reference numerals and the
description thereof is omitted.
[0030]
FIG. 5 is a cross-sectional view of the magnetostrictive speaker in the second embodiment of the
present invention. The magnetostrictive actuator 201 further includes a cushion 309 which is an
elastic body. The cushion 309 has a lower surface coupled to the lid portion 210 a and an upper
surface coupled to the central portion 203 a of the leaf spring 203. The leaf spring 203 presses
the magnetostrictive actuator 201 downward via the cushion 309 by a restoring force. Therefore,
by changing the thickness of the cushion 309, it is possible to use a small number of types of leaf
springs as they are for actuators of various thicknesses, and the versatility as a component is
improved.
[0031]
Third Embodiment A magnetostrictive speaker 400 according to a third embodiment of the
present invention will be described below with reference to the drawings. The same parts as in
the first embodiment and the second embodiment are denoted by the same reference numerals,
04-05-2019
9
and the description will be omitted.
[0032]
FIG. 6 is a top view of the magnetostrictive speaker in the third embodiment of the present
invention. FIG. 7 is a cross-sectional view of the magnetostrictive speaker in FIG. 6 as viewed in
the direction of arrow D, along the line C-C '. As shown in FIGS. 6 and 7, the diaphragm 202
includes a plurality of clamp portions 402. The plate spring 203 is provided with a plurality of
projections 403 on the outer peripheral portion 203 b.
[0033]
Next, a procedure for attaching the plate spring 203 to the diaphragm 202 will be described.
First, the protrusion 403 of the plate spring 203 is disposed on the diaphragm 203 in which the
clamp portion 402 is not provided. Then, the plate spring 203 is rotated with the straight line
drawn perpendicular to the paper surface of FIG. 6 as a rotation axis, and the protrusions 403
are inserted and fixed in the clamp portion 402, respectively. Then, the protrusion 403 and the
clamp portion 402 are coupled using an adhesive.
[0034]
Thereby, since the diaphragm 202 and the plate spring 203 can be mechanically joined, the joint
strength is increased as compared with the case where only the adhesive is used for joining.
[0035]
From the viewpoint of facilitating fixing of the plate spring 203 and the diaphragm 202 and
preventing damage to the protrusion 403 and the clamp portion 402, the protrusion 403 and the
clamp portion 402 are the outer peripheral portion 203b of the plate spring 203 and the
diaphragm It is desirable that they be provided at equal intervals on the outer peripheral side of
202, respectively.
[0036]
Fourth Embodiment A magnetostrictive speaker 500 according to a fourth embodiment of the
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present invention will be described below with reference to the drawings.
The same parts as in the first to third embodiments are assigned the same reference numerals,
and the description will be omitted.
[0037]
FIG. 8 is a cross-sectional view of the magnetostrictive speaker in the fourth embodiment of the
present invention.
A plurality of holes are provided on the outer peripheral portion 203 b of the plate spring 203
and on the outer peripheral side of the diaphragm 202 in order to pass the screw 511 and the
nut 512. The plate spring 203 is fixed to the diaphragm 202 by a screw 511 and a nut 512.
[0038]
Thereby, since the diaphragm 202 and the plate spring 203 can be mechanically joined, the joint
strength is increased as compared with the case where only the adhesive is used for joining.
[0039]
Fifth Embodiment A magnetostrictive speaker 600 according to a fifth embodiment of the
present invention will be described below with reference to the drawings.
The same parts as in the first to fourth embodiments are assigned the same reference numerals
and explanation thereof is omitted.
[0040]
FIG. 9 is a cross-sectional view of the magnetostrictive speaker in the fifth embodiment of the
present invention. The diaphragm 202 is provided with a male screw portion 602 on the entire
outer peripheral edge. In addition, the leaf spring 203 is provided with a female screw portion
04-05-2019
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603 at the entire inner edge of the outer peripheral portion 203b. The female screw portion 603
of the plate spring 203 is screwed into the male screw portion 602 of the diaphragm 202, and
the diaphragm 202 and the plate spring 203 are fixed.
[0041]
Since the diaphragm 202 and the plate spring 203 can be mechanically joined, the joint strength
is increased as compared with the case where they are joined using only the adhesive.
[0042]
Sixth Embodiment The following describes a mobile unit on which the magnetostrictive speaker
700 according to the sixth embodiment of the present invention is mounted, with reference to
the drawings.
The same parts as in the first to fifth embodiments are assigned the same reference numerals
and descriptions thereof will be omitted.
[0043]
FIG. 10 is a cross-sectional view of a car equipped with the magnetostrictive speaker in the sixth
embodiment of the present invention. For example, the magnetostrictive speaker 700 is built in
the headrest of the rear seat of the automobile 710 which is a moving body. In addition, it may
be incorporated in the headrest or door of the front seat.
[0044]
As a result, heat, dust, water, and the like may be the cause of failure in the case of an ordinary
speaker using materials such as cloth, paper, and rubber. The magnetostrictive speaker 700 of
the present embodiment is externally exposed to heat, dust, and water. Since it is hard to break
down, etc., it is possible to suppress the breakdown and function the speaker even in a bad use
environment.
[0045]
In addition, the magnetostrictive speaker 700 may be incorporated in a center console or an
04-05-2019
12
instrument panel, in a home appliance such as a rice cooker or a refrigerator, or in a building
such as a ceiling material for a house or a wall material.
[0046]
In the present embodiment, the magnetostrictive speaker 700 is mounted on a car 710 as a
moving body, but may be mounted on another electronic device or the like.
[0047]
The magnetostrictive speaker of the present invention is useful as an audio device mounted on
household appliances such as a rice cooker and a washing machine installed in a living space,
and an AV device such as a television.
[0048]
The perspective view of the magnetostrictive speaker according to the first embodiment of the
present invention The magnetostrictive speaker in FIG. 1 is viewed from the direction of arrow A
When the cross section taken along the line B-B 'of the magnetostrictive speaker in FIG. Crosssectional view Cross-sectional view showing a coupled state of a plate spring, a magnetostrictive
actuator, and a diaphragm in the first embodiment of the present invention Cross-sectional view
of a magnetostrictive speaker in the second embodiment of the present invention
Magnetostrictive speaker in the third embodiment of the present invention Top view FIG. 6 is a
sectional view of the magnetostrictive speaker in FIG. 6 taken along line C-C 'when viewed in the
direction of arrow D. FIG. 6 is a sectional view of the magnetostrictive speaker according to the
fourth embodiment of the present invention. Cross-sectional view of a speaker Cross-sectional
view of a moving body equipped with a magnetostrictive speaker according to a sixth
embodiment of the present invention Cross-sectional view showing the structure of a
conventional flat panel speaker
Explanation of sign
[0049]
100, 200, 300, 400, 500, 600, 700 magnetostrictive speaker 101 frame 102, 210 yoke 103
magnet 104 plate 105, 205 coil bobbin 106, 206 voice coil 107 damper 108, 202 diaphragm
109 edge 110 dust cap 201 magnetostrictive actuator 203 Leaf spring 203a Center part 203b
Outer peripheral part 204 Magnetostrictive element 207 Bias magnet 208 Vibration absorber
209 Vibration transmission part 210a Lid part 210b First bottom part 210c Second bottom part
309 Cushion 402 Clamp part 403 Protrusion 511 Screw 512 Nut 602 Male screw Part 603
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Female screw part 710 Automobile
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