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JP2005204200

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JP2005204200
The present invention provides an audio device having high reliability and capable of outputting
high quality sound. A super magnetostrictive actuator 3 having a columnar magnetostrictive
element 61 which expands and contracts in an axial direction by application of a magnetic field
based on an input acoustic signal, a mounting plate 22 to which the super magnetostrictive
actuator 3 is mounted, and a mounting plate 22 are integrated. The super magnetostrictive
actuator 3 has a fixing portion 42 fixed to the mounting plate 22 and an end contact portion 64c.
Are disposed so as to abut on the outer casing 21 to transmit the vibration based on the
expansion and contraction of the columnar magnetostrictive element 61 to the outer casing 21.
[Selected figure] Figure 1
Sound equipment
[0001]
The present invention relates to an acoustic device using a magnetostrictive element.
[0002]
A speaker disclosed in Japanese Patent Application Laid-Open No. 10-145892 is known as this
type of audio equipment.
In this acoustic device, one end of a columnar magnetostrictive element (super magnetostrictive
rod) in the giant magnetostrictive actuator is formed on a fixed end which can not move in the
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axial direction by being supported by the disk-shaped yoke. An actuator rod is integrally
connected to the other end of the columnar magnetostrictive element through a movable yoke. In
this case, the actuator rod has a diaphragm fixed to its tip through a mounting disc. Therefore, in
this acoustic device, the vibration of the actuator rod is transmitted to the diaphragm and the
sound is output from the diaphragm. JP-A-10-145892 (page 3, FIG. 1)
[0003]
However, the above-mentioned audio equipment has the following problems. That is, in this
acoustic device, the tip of the actuator rod is fixed to the diaphragm via the mounting disc.
Therefore, the entire weight of the giant magnetostrictive actuator is applied as a load to the tip
of the actuator rod. In this case, since the weight of the giant magnetostrictive actuator functions
as an inertial mass for driving the diaphragm, the giant magnetostrictive actuator needs a certain
weight or more to output sound with good sound quality from the diaphragm. It is assumed.
Therefore, this acoustic device has a problem that the tip end of the actuator rod may be
damaged due to the heavy load applied, so that the reliability is low. In addition, since a heavy
load is applied to the actuator rod, it is difficult to move (vibrate) the actuator rod smoothly along
the axial direction, resulting in poor sound quality.
[0004]
The present invention has been made in view of such problems, and has as its main object to
provide an audio device having high reliability and capable of outputting a sound of good quality.
[0005]
In order to achieve the above object, an acoustic device according to the present invention
comprises an acoustic element having a columnar magnetostrictive element that expands and
contracts in an axial direction by application of a magnetic field based on an input acoustic
signal, a mounting body to which the acoustic element is attached, And a vibrator which is
integrated with a mounting main body and transmits a vibration based on expansion and
contraction of the columnar magnetostrictive element to output an acoustic signal, the acoustic
element has one end side fixed to the mounting main body The other end side is disposed so as
to abut on the vibrator, and the vibration based on the expansion and contraction of the
columnar magnetostrictive element is transmitted to the vibrator.
[0006]
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In this case, a connecting means for connecting the mounting body and the vibrating body to
each other is provided, and one end of the acoustic element is fixed to the mounting body and
the other end of the acoustic element is in contact with the vibrating body. It is possible to adopt
a configuration in which the mounting main body and the vibrating body are connected by the
connection means.
[0007]
Further, it is preferable that the vibrator and the mounting main body be integrated so as to form
a space inside, and the acoustic element is disposed in the space.
[0008]
In addition, a space having confidentiality can be formed as the space.
[0009]
Moreover, spherical space can also be formed as said space.
[0010]
In the acoustic device according to the present invention, the acoustic element is disposed such
that one end thereof is fixed to the mounting body and the other end abuts on the vibrator.
For this reason, it is possible to configure a speaker capable of maintaining a state in which the
other end side of the acoustic device is in contact without being fixed to the vibrating body.
And, even when the other end side of the acoustic element is not fixed to the vibrating body, the
vibration based on the expansion and contraction of the columnar magnetostrictive element is
surely transmitted to the vibrating body.
Therefore, the application of a large weight of a columnar magnetostrictive element or the like to
the other end side (for example, one end of a columnar magnetostrictive element) of the acoustic
element can be avoided, so that breakage of the acoustic element (especially columnar
magnetostrictive element) can be prevented. .
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As a result, according to this acoustic device, the reliability can be sufficiently improved.
Moreover, since application of a large weight to the other end side of the acoustic element can be
avoided, the columnar magnetostrictive element expands and contracts smoothly, and the
vibration is reliably transmitted to the diaphragm, so that a good quality sound is output. be able
to.
[0011]
Moreover, according to the audio equipment concerning the present invention, when connecting
the above-mentioned main part for attachment and the above-mentioned oscillating body
mutually, it can be easily connected by connecting means.
Further, by adjusting the connection state by the connection means, it is possible to easily
connect the mounting main body and the vibrating body so that the other end side of the
acoustic element reliably abuts on the vibrating body.
[0012]
Further, according to the acoustic device of the present invention, the acoustic element is
disposed in the space formed by the integrated vibrating body and the mounting body, so that
the number of parts constituting the mounting body and the vibrating body can be reduced.
Since it can be reduced, parts costs and assembly costs can be sufficiently reduced. Therefore,
the manufacturing cost of the acoustic device can be sufficiently reduced.
[0013]
Further, according to the acoustic device of the present invention, since the space formed by the
vibrating body and the mounting main body has confidentiality, the acoustic element disposed in
the space is the gas, the liquid, and the liquid surrounding the acoustic device. It operates
normally without being affected by solids etc. Therefore, this acoustic device can be installed not
only indoors but also outdoors or in a poor environment.
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[0014]
Further, according to the acoustic device of the present invention, by forming the spherical space
to be formed by the vibrating body and the attachment body, it is possible to provide the acoustic
device capable of avoiding damage to the human body or the like by the corner portion. it can. At
the same time, it is possible to configure an acoustic device with a lovely impression design.
[0015]
Hereinafter, the best mode of an audio device according to the present invention will be
described with reference to the attached drawings.
[0016]
First, the configuration of a cylindrical speaker 1 to which the audio device according to the
present invention is applied will be described with reference to the drawings.
[0017]
As shown in FIGS. 1 and 3, the cylindrical speaker 1 is configured to include a cylindrical case 2
and a giant magnetostrictive actuator 3.
In this case, the giant magnetostrictive actuator 3 is fixed to the casing 2 by the bolt 81 and the
nut 82 so that the casing 2 can output the vibration of the tip of the giant magnetostrictive
actuator 3 vibrating based on the acoustic signal as an acoustic signal (sound). It is done.
As shown in FIG. 3, the housing 2 includes, as an example, an elongated cylindrical outer housing
21 formed of a resin material and open at both ends, and lids 29 a and 29 b. The outer casing 21
is dividable into two parts of an upper cylinder 21a (upper side in FIG. 3) and a lower cylinder
21b (lower side in FIG. 3) near its central portion, and connects the upper cylinder 21a and lower
cylinder 21b. When the lids 29a and 29b are fitted, security is provided. Further, as shown in the
figure, each cylinder 21a, 21b is, for example, a mounting plate (main body for attachment in the
present invention) 22 formed along the vertical direction on the inner wall in a state of projecting
toward the central portion Is equipped. In this case, each mounting plate 22 is integrally formed
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(integrated) by resin molding with the outer casing 21 (each of the upper cylinder 21a and the
lower cylinder 21b) as an example. Further, as shown in the figure, the mounting plate 22 has, as
an example, a mounting hole 22a formed in the vicinity of a central portion dividing the housing
2 up and down, and mounting of the super magnetostrictive actuator 3 using this mounting hole
22a. (Fixed) is possible. In addition, although the upper cylinder 21a and the lower cylinder 21b
can be comprised identically by forming the attachment hole 22a in each attachment plate 22 of
the upper cylinder 21a and the lower cylinder 21b, respectively, in this example, the upper
cylinder 21a The mounting hole 22a is formed in the. In addition, the outer casing 21 outputs a
louder sound as the area of the vibrating portion is larger. Therefore, it is preferable that the area
of the portion of the outer casing 21 where the mounting plate 22 is not formed be wider. In
addition, the part except the area | region AR in which the attachment plate 22 of the outer
casing 21 is formed comprises the vibrating body in this invention. The lids 29 a and 29 b are
fitted to both ends of the outer casing 21 to maintain the confidentiality of the casing 2. Further,
a lead-in hole (not shown) is formed in one of the lids 29a and 29b for drawing the input cable 7
described later from the outside of the housing 2 to the inside, and a drawn-in portion where the
input cable 7 is drawn. The confidentiality of the case 2 is secured by sealing the
[0018]
The giant magnetostrictive actuator 3 corresponds to the acoustic element in the present
invention (same as giant magnetostrictive actuators 3A to 3C described later), and as shown in
FIG. 1, the cylindrical housing 4, the acoustic signal amplifier 5, and the vibration converter 6,
and is configured to be able to output an acoustic signal in a state in which the tip end portion is
in contact with the outer casing 21 as a vibrator. As shown in the figure, the housing 4 is formed
of a synthetic resin and has a generally elongated pencil shape, and two fixing portions 42 that
can be fixedly attached to the mounting plate 22 at its rear end, 42 (one end side of the columnar
magnetostrictive element in the present invention) is formed. In this case, each fixing portion 42
is formed with a hole 42 a through which the bolt 81 can be penetrated. Further, a partition plate
41 is provided in the housing 4, and the acoustic signal amplifier 5 is housed in the internal
space on the rear end side partitioned by the partition plate 41, and the vibration converter 6 is a
partition plate It is accommodated in the internal space of the tip part side divided by 41.
[0019]
As shown in FIG. 2, the acoustic signal amplification unit 5 is configured to be operable by the
power supplied through the power cable 71, and amplifies and generates an acoustic signal input
from the outside through the acoustic signal cable 72. The drive current thus generated is output
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to the drive coil 63 of the vibration conversion unit 6 via a connection cable (not shown). Further,
as shown in FIG. 1, the acoustic signal amplification unit 5 includes an amplifier substrate 51
disposed on the rear end side of the housing 4, and as shown in FIG. An input connector 52 and
an acoustic signal input connector 53 are mounted. In this case, as shown in the figure, the
power input connector 52 is configured as a plug that can be inserted into the jack of the power
cable 71 that supplies power from the outside. Further, as shown in the figure, the audio signal
input connector 53 is configured as a plug that can be inserted into the jack of the audio signal
cable 72 for inputting an audio signal from the outside. The power supply cable 71 and the
sound signal cable 72 are also collectively referred to as the input cable 7. In this case, the input
cable 7 is connected to a power source (not shown) and an acoustic signal output device (not
shown) outside the housing 2 and pulled into the inside of the housing 2 from the abovementioned lead-in hole. .
[0020]
The vibration conversion unit 6 is disposed in the internal space of the housing 4 and, as shown
in FIGS. 1 and 2, the columnar magnetostrictive element 61, the bias magnets 62a and 62b, the
drive coil 63, the vibration transmitter 64, and four, for example. It comprises and comprises
spring 65,65. The columnar magnetostrictive element 61 expands and contracts in the axial
direction by applying a magnetic field in the direction along the axial direction, and functions as
an element that converts magnetic field fluctuation into mechanical vibration. The columnar
magnetostrictive element 61 is formed of, for example, a super-magnetostrictive material having
a central composition Tb0.34-Dy0.66-Fe1.90 that causes a large displacement of about 1500
ppm to 2000 ppm in the axial direction in the magnetic field. It is done.
[0021]
One end face of the bias magnet 62 a is in contact with an end face of the columnar
magnetostrictive element 61 on the side of the partition plate 41, and the other end face is in
contact with the partition plate 41. The bias magnet 62b is disposed in such a manner that one
end surface thereof abuts on the end surface of the columnar magnetostrictive element 61 on the
side of the vibration transfer body 64 and the other end surface can abut on a flange 64a
described later. In this case, the bias magnets 62a and 62b apply a bias magnetic field so that the
columnar magnetostrictive element 61 can be operated at an operation point that linearly
expands and contracts (oscillates) the magnetic field in the axial direction. As shown in FIGS. 1
and 2, the drive coil 63 is disposed such that the central axis thereof is coaxial with the central
axis of the columnar magnetostrictive element 61. Further, as shown in FIG. 2, the drive coil 63
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receives a drive current from the acoustic signal amplifier 5 via the connection cable and
generates a magnetic field on the axis thereof (the axis of the columnar magnetostrictive element
61).
[0022]
As shown in FIG. 1, the vibration transfer body 64 is integrally configured by including a disk-like
flange 64 a, a shaft 64 b and a tip contact portion 64 c. As shown in the figure, the flange 64a
abuts on the bias magnet 62a at its upper end face, and abuts on the springs 65, 65... At its lower
end face. As shown in the figure, each spring 65 has one end abutting on the flange 64 a and the
other end abutting on the inner wall of the housing 4, and urges the flange 64 a toward the
columnar magnetostrictive element 61. It is disposed in the internal space of the housing 4 in a
state of being contracted. The shaft 64b is provided with a tip contact portion 64c at its tip
surface, and transmits the vibration of the flange 64a to the tip contact portion 64c. As shown in
the figure, the tip contact portion 64c is, for example, formed in a hemispherical shape on the tip
end side, and finely adjusted in the direction away from or toward the shaft 64b by rotating the
tip contact portion 64c. Is possible. That is, the entire length of the vibration transfer body 64
can be adjusted (varied) by rotating the tip contact portion 64c. Further, a fixing means for fixing
a state in which the entire length of the vibration transfer body 64 is adjusted in order to avoid
the length variation of the vibration transfer body 64 caused by the rotation of the tip contact
portion 64c due to the vibration of the columnar magnetostrictive element 61 (Not shown) is
disposed on the shaft 64b. Further, the tip contact portion 64 c transmits the vibration of the
vibration transfer body 64 to the outer casing 21 in the state of being in contact with the outer
casing 21. Therefore, as shown in FIG. 1, the flange 64a is biased by the spring 65, whereby the
flange 64a, the bias magnet 62b, the columnar magnetostrictive element 61 and the bias magnet
62a are integrally connected, and the vibration transmitter 64 Is kept movable (vibratable) along
its axial direction. For this reason, the vibration transfer body 64 moves in a direction away from
the partition plate 42 when the columnar magnetostrictive element 61 expands, and moves in a
direction approaching the partition plate 42 when the columnar magnetostrictive element 61
contracts. . As a result, in response to the expansion and contraction of the columnar
magnetostrictive element 61, the vibration transfer body 64 (flange 64a) vibrates in the direction
along the expansion and contraction direction. The distal end contact portion 64 c constitutes the
other end side of the acoustic element in the present invention.
[0023]
At the time of assembly of the cylindrical speaker 1, as shown in FIG. 1, nuts 82 are tightened to
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bolts 81 through which the holes 42a of the fixing portion 42 and the mounting holes 22a of the
mounting plate 22 of the housing 2 penetrate. The super magnetostrictive actuator 3 is fixed to
the mounting plate 22. Further, at this time, the tip contact portion 64 c of the super
magnetostrictive actuator 3 is rotated to finely adjust the total length of the vibration transfer
body 64, thereby bringing the tip contact portion 64 c into contact with the inner wall of the
outer casing 21. Thus, the assembly of the cylindrical speaker 1 is completed. On the other hand,
when installing the cylindrical speaker 1 (same as the cylindrical speakers 1A to 1C and the
super magnetostrictive speaker 11 described later) in the garden etc., install the cylindrical
speaker 1 on the ground etc. and then connect the input cable 7 Do. Thus, the installation of the
cylindrical speaker 1 is completed.
[0024]
Next, the overall operation of the cylindrical speaker 1 will be described.
[0025]
In the cylindrical speaker 1, the acoustic signal amplification unit 5 amplifies an acoustic signal
input from the outside through the acoustic signal cable 72 and supplies a drive current to the
drive coil 63.
At this time, the drive coil 63 applies a magnetic field generated based on the supplied drive
current to the columnar magnetostrictive element 61. Therefore, the columnar magnetostrictive
element 61 expands and contracts in the axial direction according to the applied magnetic field.
At this time, since the housing 4 is fixed to the mounting plate 22, the mounting plate 22 and the
outer casing 21 in the area AR function as an inertial mass. For this reason, the vibration due to
the expansion and contraction of the columnar magnetostrictive element 61 is transmitted to the
outer casing 21 through the bias magnet 62b, the flange 64a, the shaft 64b and the tip contact
portion 64c. In this state, the other portion of the outer casing 21 except the portion of the area
AR (that is, substantially the entire region of the outer casing 21) vibrates, whereby the outer
casing 21 is a sound that can be sufficiently heard by the acoustic signal input from the outside.
Output from
[0026]
As described above, according to this cylindrical speaker 1, by fixing the super magnetostrictive
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actuator 3 to the mounting plate 22 by tightening the bolt 81 and the nut 82, the tip contact
portion 64c is fixed to the outer casing 21 as a vibrating body. It is possible to configure a
speaker that can maintain the state of being in contact with the outer casing 21 without doing so.
Therefore, application of a large weight to the tip contact portion 64c can be avoided, so that
breakage of the tip contact portion 64c (that is, the giant magnetostrictive actuator 3) can be
prevented. As a result, the reliability of the cylindrical speaker 1 can be sufficiently improved. In
addition, since application of a large weight to the tip contact portion 64c can be avoided, the
columnar magnetostrictive element 61 smoothly expands and contracts, and the vibration is
reliably transmitted to the outer casing 21. As a result, a good quality sound is output. be able to.
[0027]
Further, according to the cylindrical speaker 1, the super magnetostrictive actuator 3 is disposed
in the space formed by the integrated outer casing 21 and the attachment plate 22, thereby
forming the outer casing 21 and the attachment plate 22. Since the number of parts can be
reduced, parts costs and assembly costs can be sufficiently reduced. Therefore, the
manufacturing cost of the cylindrical speaker 1 can be sufficiently reduced. In addition, since the
space is formed to have confidentiality, the super magnetostrictive actuator 3 disposed in the
space operates normally without being affected by the gas, liquid, solid and the like of the
cylindrical speaker 1. Therefore, the cylindrical speaker 1 can be installed not only indoors but
also outdoors or in a poor environment.
[0028]
The present invention is not limited to the above configuration. For example, although an
example in which one mounting plate 22 is formed inside the outer housing 21 has been
described above, a configuration in which a plurality of mounting plates are formed as in the
cylindrical speakers 1A and 1B shown in FIGS. You can also. In addition, about the component
which has the function same as the component in the cylindrical speaker 1 hereafter, the same
code | symbol is attached | subjected and the description which overlapped is abbreviate |
omitted.
[0029]
Next, the cylindrical speaker 1A will be described. The external appearance of the cylindrical
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speaker 1A is the same as that of the cylindrical speaker 1 (the same applies to cylindrical
speakers 1B and 1C described later). On the other hand, as shown in FIG. 4, the housing 2A of the
cylindrical speaker 1A has two mounting plates formed along the vertical direction on the inner
wall of the outer housing 21 in a state of projecting toward the central portion of the internal
space (Attachment body in the present invention) 23, 23 are provided. In this case, the mounting
plates 23, 23 are formed integrally with the outer casing 21 by resin molding, as an example.
Moreover, the part except the area | region ARa in which the attachment plates 23 and 23 in the
outer casing 21 are formed comprises the vibrating body in this invention. Further, mounting
holes 23a for mounting the giant magnetostrictive actuator 3A are formed in the mounting plates
23, 23, respectively. On the other hand, as shown in the figure, the housing 4A of the giant
magnetostrictive actuator 3A is formed of a synthetic resin to be formed into a slender pencil
type as a whole, and fixed to the mounting plates 23, 23 at its rear end. A fixing portion 43 for
mounting is formed. In this case, the fixing portion 43 is formed with a hole 43 a through which
a bolt 81 described later can be passed.
[0030]
At the time of assembly of the cylindrical speaker 1A, the super magnetostrictive actuator 3A is
fixed by tightening a nut 82 on a bolt 81 through which the hole 43a of the fixing portion 43 and
the mounting holes 23a of the mounting plates 23 and 23 of the housing 2A penetrate. It fixes to
the mounting plates 23 and 23. Further, in this case, the total length of the vibration transfer
body 64 is finely adjusted in the same manner as the cylindrical speaker 1. Thus, the assembly of
the cylindrical speaker 1A is completed. According to the cylindrical speaker 1A, substantially the
same function and effect as the cylindrical speaker 1 can be obtained although the area of the
diaphragm is slightly reduced.
[0031]
Next, the cylindrical speaker 1B will be described. In this cylindrical speaker 1B, as shown in FIG.
5, two mounting plates (in which the housing 2B is formed along the vertical direction on the
inner wall of the outer housing 21 so that the end surfaces thereof face each other) In the
present invention, the mounting bodies 24 and 24 are provided. In this case, the mounting plates
24 are integrally formed with the outer casing 21 by resin molding. Moreover, the part except
the area | region ARb in which the attachment plates 24 and 24 of the outer casing 21 are
formed comprises the vibrating body in this invention. Further, as shown in the drawing,
mounting holes 24a for mounting the super magnetostrictive actuator 3B are formed in the
vicinity of the central portion of the housing 2B, as shown in the figure, in the mounting plates
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24, 24, respectively. Further, screw threads fitted with the screws 83 are formed in the
respective mounting holes 24a. On the other hand, as shown in the figure, the housing 4B of the
giant magnetostrictive actuator 3B is formed of a synthetic resin to be formed into a slender
pencil type as a whole, and fixed to the mounting plates 24, 24 at its rear end. Two fixing parts
44, 44 for mounting are formed. In this case, the fixing portion 44 is formed with holes 44 a and
44 a through which the screw 83 can be passed.
[0032]
At the time of assembly of the cylindrical speaker 1B, the super magnetostrictive actuator 3B is
attached by screwing bolts 83 penetrating the holes 44a of the fixing parts 44 into the
attachment holes 24a and 24a of the attachment plates 24 and 24. Fix it at 24,24. At this time,
the total length of the vibration transfer body 64 is finely adjusted in the same manner as the
cylindrical speakers 1 and 1A. Thus, the assembly of the cylindrical speaker 1B is completed.
According to this cylindrical speaker 1B, substantially the same function and effect as the
cylindrical speaker 1 can be obtained although the area of the diaphragm is slightly reduced.
[0033]
Furthermore, the present invention is not limited to the configuration described above. For
example, although the example which fixes super-magnetostrictive actuator 3-3B and case 2-2B
on the inside side of outer case 21 was mentioned above, it is integral with case 2C like
cylindrical speaker 1C shown in FIG. The screw 84 inserted from the outside of the housing 2C
into the mounting hole 25a of the formed mounting plate 25 (the mounting body in the present
invention) is formed in the fixing portion 45 on the rear end side of the housing 4C in the super
magnetostrictive actuator 3C. The super magnetostrictive actuator 3C can also be fixed to the
housing 2C by screwing the screw hole 45a. In this case, the portion of the outer casing 21
excluding the area ARc in which the mounting plate 25 is formed constitutes the vibrator in the
present invention. Alternatively, a configuration may be employed in which a sealing member
such as a packing is sandwiched between the fixing portion 45 and the mounting plate 25 to
maintain the secrecy of the housing 2C.
[0034]
According to this cylindrical speaker 1C, substantially the same function and effect as the
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cylindrical speaker 1A can be obtained. Further, as compared with the assembling method of the
casings 2 to 2B and the super magnetostrictive actuator 3 to 3B in the cylindrical speakers 1 to
1B, since the screw 84 can be screwed from the outside of the casing 2C, the fixing operation
Can be done easily.
[0035]
Furthermore, in the above-described cylindrical speakers 1 to 1C, a configuration is adopted in
which the outer casing 21 and the attachment plates 22 to 25 are integrated and the casings 2 to
2C are formed so as to have confidentiality. The present invention is not limited to these
configurations. Like the giant magnetostrictive speaker 11 shown in FIG. 7, for example, the
diaphragm 91 (the vibrator according to the present invention) having a square front view, the
giant magnetostrictive actuator 3C, and the mounting plate 92 having the same shape as the
diaphragm 91 (in the present invention) Mounting body), and by fastening each nut 87 to each
bolt 86 using four bolts 86, 86... And eight nuts 87, 87. A configuration for coupling can be
employed. In this case, four sets of bolts 86 and nuts 87, 87 constitute the connection means in
the present invention.
[0036]
In this giant magnetostrictive speaker 11, as shown in FIG. 7, it is formed in the fixing portion 45
on the rear end side of the housing 4C in the giant magnetostrictive actuator 3C via the
mounting hole 92a formed in the central portion of the mounting plate 92. The super
magnetostrictive actuator 3C is fixed to the central portion of the mounting plate 92 by screwing
a screw 84 into the screw hole 45a. Further, in this giant magnetostrictive speaker 11, by
adjusting the tightening amount of the nut 87 with respect to the bolt 86, the distal end contact
portion 64c in the giant magnetostrictive actuator 3C abuts on the central portion of the
diaphragm 91 and the diaphragm 91 and the mounting plate And 92 are mutually connected. In
this case, the mounting plate 92 functions as an inertial mass, and the vibration due to the
expansion and contraction of the columnar magnetostrictive element 61 is transmitted to the
diaphragm 91 via the tip contact portion 64 c.
[0037]
As described above, according to this giant magnetostrictive speaker 11, substantially the same
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function and effect as the cylindrical speaker 1 described above can be obtained except for the
confidentiality. Further, since the screw 84 can be easily screwed in the same manner as the
cylindrical speaker 1C, the assembly of the diaphragm 91 and the mounting plate 92 and the
work of fixing the super magnetostrictive actuator 3C to the mounting plate 92 are easy Can be
done.
[0038]
Furthermore, the present invention is not limited to the configuration described above. For
example, in the cylindrical speakers 1 to 1C described above, the cylindrical casings 2 to 2C are
employed, but instead, the casings can be configured in any shape such as a rectangular
parallelepiped or a hexahedron . Moreover, it can also be comprised by the spherical housing |
casing 20 like the spherical speaker 12 shown in FIG.
[0039]
As shown in the figure, the spherical speaker 12 includes a spherical casing 20 capable of being
divided into two, and a giant magnetostrictive actuator 3A, and encloses the vibration of the tip
of the giant magnetostrictive actuator 3A that vibrates based on an acoustic signal. The body 20
is configured to be able to output as an acoustic signal (sound). As shown in the figure, the case
20 is configured by including, for example, a semispherical upper case 20a and a lower case 20b
formed of resin, and the respective ends of the two cases 20a and 20b By being fitted together
and integrally coupled by a fitting portion (not shown) formed in the portion, it is configured in a
spherical shape having overall confidentiality. In this case, as shown in the figure, in the lower
housing 20b, a base on which a screw hole (not shown) capable of fixing the super
magnetostrictive actuator 3A by screwing is formed on the inner wall slightly inside the end. It is
formed by integrally molding the lower housing 20b with the mounting main body 96 (in the
present invention). In the lower housing 20b, a flat portion 95 on which the tip contact portion
64c of the magnetostrictive actuator 3A can vertically contact is molded integrally with the lower
housing 20b on the inner wall at a position facing the pedestal 96. It is formed by. Further, a
power supply (not shown) for supplying power to the giant magnetostrictive actuator 3A through
the power cable 71 and an acoustic signal to the giant magnetostrictive actuator 3A through the
acoustic signal cable 72 inside the lower housing 20b An acoustic signal output unit (not shown)
is disposed. The portion of the housing 20 excluding the area ARd in which the pedestal 96 is
formed constitutes the vibrator in the present invention.
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[0040]
In this case, as shown in FIG. 8, the super magnetostrictive actuator 3A is disposed in such a
manner that the hole 43a formed in the fixed portion 43 of the housing 4A and the screw hole
formed in the pedestal 96 communicate with each other. , And is fixed to the housing 20 by
tightening a screw 85. Further, as shown in the figure, in the super magnetostrictive actuator 3A,
the length of the vibration transfer body 64 is finely adjusted such that the tip contact portion
64c abuts on the flat portion 95. Therefore, the housing 4A and the pedestal 96 function as an
inertial mass, and the vibration due to the expansion and contraction of the columnar
magnetostrictive element 61 is transmitted to the housing 20 through the tip contact portion
64c.
[0041]
According to this spherical speaker 12, in addition to the same function and effect as the
cylindrical speaker 1 described above, since the shape of the housing 20 is spherical, there is no
corner portion, so the human body etc. It is possible to provide an audio device that can avoid
scratching. Therefore, it can be installed safely in the place which is easy to contact human
bodies, such as a swimming pool. In addition, it is possible to configure an acoustic device of
spherical design that gives a lovely impression. Furthermore, since housings of various shapes
other than the spherical shape can be adopted, acoustic devices of various designs can be
configured. Further, since the number of parts can be reduced by integrating the pedestal 96 and
the lower housing 20b, parts cost and assembly cost can be sufficiently reduced.
[0042]
Further, the present invention is not limited to the above configuration. For example, in the
cylindrical speakers 1 to 1C, a configuration in which a power supply unit and an acoustic signal
output unit are provided outside the housings 2 to 2C is adopted, but a power supply unit and an
acoustic signal are provided inside the housings 2 to 2C. A configuration in which the output unit
is disposed can also be adopted. Conversely, in the spherical speaker 12, a configuration in which
the power supply unit and the acoustic signal output unit are disposed inside the housing 20 is
adopted, but the power supply unit and the acoustic signal output unit are disposed outside the
housing 20. Configurations can also be adopted. In addition, although the cylindrical speakers 1
to 1C, the super magnetostrictive speaker 11 and the spherical speaker 12 having a
configuration in which one columnar magnetostrictive element 61 is provided are described
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above, the number of columnar magnetostrictive elements 61 is not limited to one, It can also be
set up.
[0043]
Furthermore, in the cylindrical speakers 1 to 1C and the spherical speaker 12, the entire length
of the vibration transfer body 64 can be varied by rotating the tip contact portion 64c, and the
tip contact portion 64c is an outer casing as a vibrator. 21 and the case 20 are adopted, but as
the structure for bringing the tip contact portion 64c into contact with the outer case 21 and the
case 20, the case 4 to 4C in the super magnetostrictive actuator 3 to 3C It is also possible to
adopt a configuration in which adjustment means for adjusting the length of the housing is
provided, or to adopt a configuration in which position adjustment means for adjusting the
position of the housings 4 to 4C is provided on the housings 2 to 2C or the housing 20 side. You
can also.
[0044]
It is sectional drawing cut | disconnected by the AA line in FIG. 3 which shows the structure of
the cylindrical speaker 1. As shown in FIG.
5 is a block diagram showing an electric circuit of the giant magnetostrictive actuator 3. FIG. FIG.
2 is an exploded perspective view showing the configuration of a cylindrical speaker 1; FIG. 2 is a
cross-sectional view showing a configuration of a cylindrical speaker 1A. It is sectional drawing
which shows the structure of the cylindrical speaker 1B. It is sectional drawing which shows the
structure of the cylindrical speaker 1C. FIG. 2 is a cross-sectional view showing the configuration
of the giant magnetostrictive speaker 11; FIG. 2 is an exploded perspective view showing the
configuration of a spherical speaker 12;
Explanation of sign
[0045]
1, 1A to 1C cylindrical speakers 2, 2A to 2C, 20 housings 3, 3A to 3C giant magnetostrictive
actuators 11 giant magnetostrictive speakers 12 spherical speakers 21 outer casing 22, 23, 24,
92 mounting plate 42 to 45 fixed part 61 Columnar Magnetostrictive Element 64c Abutment
Part 86 Bolt 87 Nut 91 Diaphragm 96 Base
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