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JP2005191776

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DESCRIPTION JP2005191776
The present invention provides an audio device that can be easily attached and detached to any
place. A columnar magnetostrictive element 51 is provided with a partition plate 22 at one end
side, one end defined at a fixed end and the other end defined at a free end, and expanded and
contracted along an axial direction, and an acoustic signal. A drive coil 54 for generating a
magnetic field for expanding and contracting the columnar magnetostrictive element 51 by a
drive current, and a bias magnet 53 disposed on the other end side of the columnar
magnetostrictive element 51 for applying a bias magnetic field to the columnar magnetostrictive
element 51 In the state where the magnet 53 is in contact with the glass plate 7, the magnetic
body 8 is adsorbed to the bias magnet 53 via the glass plate 7 so that the magnet 53 can be
attached to the glass plate 7. The vibration resulting from is transmitted to the glass plate 7.
[Selected figure] Figure 1
Audio equipment and speakers
[0001]
The present invention relates to an acoustic device and a speaker using a magnetostrictive
element.
[0002]
An acoustic device disclosed in Japanese Patent Laid-Open No. 9-261797 is known as this type
of acoustic device.
04-05-2019
1
This acoustic device includes a columnar magnetostrictive element and a drive coil wound
around a bobbin around the columnar magnetostrictive element. In this case, the columnar
magnetostrictive element is disposed in such a manner that one end thereof abuts against the
disk-shaped magnetic body and the other end abuts against the end of the magnetic member.
Further, a flange is formed on the magnetic member, and an elastic member is inserted between
the flange and the case. Therefore, the magnetic member is urged toward the columnar
magnetostrictive element by the inserted elastic member, and is thus maintained in a state
capable of advancing and retracting in the direction along the vibration direction of the columnar
magnetostrictive element. As a result, the disk-shaped magnetic body, the columnar
magnetostrictive element, and the magnetic member are integrally connected in a state in which
the vibration of the columnar magnetostrictive element is allowed.
[0003]
In this acoustic device, when a drive current based on the acoustic signal is supplied, the drive
coil generates a magnetic field oriented in the axial direction of the columnar magnetostrictive
element. At this time, the columnar magnetostrictive element expands and contracts in the axial
direction when the generated magnetic field is applied. Therefore, the magnetic member vibrates
in the axial direction according to the expansion and contraction of the columnar
magnetostrictive element. Therefore, when the magnetic member is pressed against a vibrating
body such as a vibrating plate, the vibration is transmitted to the vibrating body, and a sound is
output from the vibrating body.
[0004]
Moreover, the speaker disclosed by Unexamined-Japanese-Patent No. 10-145892 is known as
this kind of speaker. In this speaker, one end of a columnar magnetostrictive element (supermagnetostrictive rod) is formed on a fixed end which can not move in the axial direction by being
supported by a 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 speaker, the vibration of the
actuator rod is transmitted to the diaphragm and the sound is output from the diaphragm. JP-A9-261797 (page 3, FIG. 1) JP-A-10-145892 (page 3, FIG. 1)
[0005]
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2
However, the above-mentioned audio equipment has the following problems. That is, in this
acoustic device, sound is output from the diaphragm by pressing the magnetic member against
the diaphragm. Therefore, in order to output sound, a method of pressing the magnetic member
against the diaphragm with a human hand (hereinafter, also referred to as “first method”), a
method of using a jig for pressing and fixing the magnetic member ( Hereinafter, also referred to
as “the second method” or a method of fixing the magnetic member to the diaphragm using a
screw or an adhesive (in this method, the inertial mass of the acoustic device is used as a force
pressing the diaphragm) Do. Hereinafter, it may be considered to adopt “the third method” or
the like. In this case, the first method is somewhat complicated because it is necessary to
continue holding the audio device while outputting the sound. In addition, in the second method,
it is complicated for each user to manufacture a jig, and using a special jig as an accessory of the
acoustic device also increases the manufacturing cost. Further, in the third method, since the
magnetic member is fixed to the diaphragm with a screw or an adhesive, it is difficult to change
the mounting position or change to another diaphragm after fixing once. In addition, the use of
screws and an adhesive may cause the diaphragm to be punctured or adhere to the adhesive.
[0006]
On the other hand, the conventional speaker has the following problems. That is, in this speaker,
the columnar magnetostrictive element or the like is fixed to the diaphragm via the mounting
disc. Therefore, there is a problem that it is difficult to change to another arbitrary diaphragm
(vibration transmission target) and enjoy different sound quality and design change.
[0007]
The present invention has been made in view of such problems, and has as its main object to
provide an audio device that can be easily attached and detached to any place. Another main
object is to provide a speaker that can be easily replaced with any vibration transmission target.
[0008]
In order to achieve the above object, in the acoustic device according to the present invention, a
pillar is provided with a stopper on one end side, the one end is defined as a fixed end, and the
other end is defined as a free end to expand and contract along the axial direction. A
magnetostrictive element, a magnetic field generation unit for generating a magnetic field for
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expanding and contracting the columnar magnetostrictive element by a drive current based on
an acoustic signal, and the other end side of the columnar magnetostrictive element apply a bias
magnetic field to the columnar magnetostrictive element Permanent magnet, and in a state where
the permanent magnet is in contact with the vibration transfer target body, the permanent
magnet is attached to the vibration transfer target body by adsorbing a magnetic body to the
permanent magnet via the vibration transfer target body It is configured to be able to transmit
the vibration caused by the expansion and contraction of the columnar magnetostrictive element
to the vibration transmission object.
[0009]
In the acoustic device according to the present invention, a columnar magnetostrictive element is
provided with a stopper on one end side and the one end is defined as a fixed end and the other
end is defined as a free end to expand and contract along the axial direction; A magnetic field
generation unit that generates a magnetic field that expands and contracts the columnar
magnetostrictive element by a drive current based on an acoustic signal, and a magnetic body
disposed on the other end side of the columnar magnetostrictive element In a state of being in
contact with the body, the magnetic substance is attached to a permanent magnet capable of
applying a bias magnetic field to the columnar magnetostrictive element via the vibration
transfer target body so as to be attachable to the vibration transfer target body. Further, the
vibration caused by the expansion and contraction of the columnar magnetostrictive element can
be transmitted to the vibration transmission object.
[0010]
Further, the speaker according to the present invention has a columnar magnetostrictive element
in which a stopper is disposed at one end and the one end is defined as a fixed end and the other
end is defined as a free end and extends and contracts along an axial direction. A magnetic field
generation unit that generates a magnetic field that expands and contracts the columnar
magnetostrictive element by a drive current based on a signal; a permanent magnet that is
disposed on the other end side of the columnar magnetostrictive element and applies a bias
magnetic field to the columnar magnetostrictive element; The vibration transmitting object
disposed in a state in which one surface is in contact with the permanent magnet, and the other
surface of the vibration transmitting object are attracted to the permanent magnet via the
vibration transmission object. And the magnetic substance to be transmitted to the vibration
transmitting object so as to transmit the vibration caused by the expansion and contraction of the
columnar magnetostrictive element.
[0011]
Further, the speaker according to the present invention has a columnar magnetostrictive element
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in which a stopper is disposed at one end and the one end is defined as a fixed end and the other
end is defined as a free end and extends and contracts along an axial direction. A magnetic field
generation unit generates a magnetic field for expanding and contracting the columnar
magnetostrictive element by a drive current based on a signal, a magnetic body disposed on the
other end side of the columnar magnetostrictive element, and one surface is in contact with the
magnetic body The vibration transmitting object disposed in the state and the other surface of
the vibration transmitting object are disposed, and the magnetic material is adsorbed via the
vibration transmission object, and a bias magnetic field is applied to the columnar
magnetostrictive element And a permanent magnet for applying the vibration, and the vibration
resulting from the expansion and contraction of the columnar magnetostrictive element can be
transmitted to the vibration transfer target body.
[0012]
In the acoustic device according to the present invention, the stopper is disposed on one end side
of the columnar magnetostrictive element, and the permanent magnet for applying a bias
magnetic field to the columnar magnetostrictive element is disposed on the other end side of the
columnar magnetostrictive element.
Therefore, in a state where the permanent magnet is in contact with the vibration transfer target
body, the acoustic device is fixed to the vibration transfer target body by adsorbing the magnetic
body to the permanent magnet via the vibration transfer target body. At the same time, the
vibration caused by the expansion and contraction of the columnar magnetostrictive element is
transmitted to the vibration transfer object.
Therefore, although it is a simple fixing method of adsorbing the magnetic body to the
permanent magnet of the acoustic device through the vibration transfer target body, the sound
can be applied to any place (vibration transfer target body) where the permanent magnet and the
magnetic body can be adsorbed. The device can be easily attached and detached.
[0013]
In the acoustic device according to the present invention, the stopper is provided on one end side
of the columnar magnetostrictive element and the magnetic body is provided on the other end
side of the columnar magnetostrictive element.
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Therefore, in a state where the magnetic body is in contact with the vibration transfer target
body, the acoustic device is fixed to the vibration transfer target body by adsorbing the magnetic
body to the permanent magnet via the vibration transfer target body. At the same time, the
vibration caused by the expansion and contraction of the columnar magnetostrictive element is
transmitted to the vibration transfer object.
Therefore, it is a simple fixing method in which the magnetic body of the acoustic device is
adsorbed to the permanent magnet through the vibration transfer target body, but the sound is
applied to any place (vibration transfer target body) where the magnetic body and the permanent
magnet can be adsorbed. The device can be easily attached and detached.
[0014]
Further, in the speaker according to the present invention, the stopper is disposed on one end
side of the columnar magnetostrictive element, and the permanent magnet for applying a bias
magnetic field to the columnar magnetostrictive element is disposed on the other end side of the
columnar magnetostrictive element. Therefore, in a state where the permanent magnet is in
contact with the vibration transfer target body, the columnar magnetostrictive element or the like
is fixed to the vibration transfer target body by adsorbing the magnetic body to the permanent
magnet via the vibration transfer target body. Vibration caused by the expansion and contraction
of the columnar magnetostrictive element is transmitted to the vibration transfer target.
Therefore, it is a simple fixing method of adsorbing the magnetic body to the permanent magnet
via the vibration transfer target body, but on any vibration plate (vibration transfer target body
such as a housing) in which the permanent magnet can adsorb the magnetic body. The columnar
magnetostrictive element or the like can be easily fixed. As a result, since any diaphragm can be
easily replaced, various sound quality and design changes can be sufficiently enjoyed.
[0015]
Further, in the speaker according to the present invention, the stopper is disposed on one end
side of the columnar magnetostrictive element, and the magnetic body is disposed on the other
end side of the columnar magnetostrictive element. Therefore, in a state where the magnetic
body is in contact with the vibration transfer target body, a columnar magnetostrictive element
or the like is fixed to the vibration transfer target body by adsorbing the magnetic body to the
04-05-2019
6
permanent magnet via the vibration transfer target body. Vibration caused by the expansion and
contraction of the columnar magnetostrictive element is transmitted to the vibration transfer
target. Therefore, it is a simple fixing method of adsorbing the magnetic body to the permanent
magnet via the vibration transfer target body, but on any vibration plate (vibration transfer target
body such as a housing) in which the permanent magnet can adsorb the magnetic body. The
columnar magnetostrictive element or the like can be easily fixed. As a result, since any
diaphragm can be easily replaced, various sound quality and design changes can be sufficiently
enjoyed.
[0016]
Hereinafter, with reference to the accompanying drawings, the best mode of the acoustic device
and the speaker according to the present invention will be described.
[0017]
First, the configuration of a pencil-type speaker 1 to which the audio device according to the
present invention is applied will be described with reference to the drawings.
[0018]
As shown in FIG. 1, the pencil-type speaker 1 includes a cylindrical casing 2, an acoustic signal
amplifier 3, a power supply 4, and a vibration converter 5. The acoustic signal can be output
when pressed against a plate as a body or when the bias magnet 53 adsorbs the magnetic body 8
via, for example, the glass plate 7 as a vibration transfer target. There is.
As shown in the figure, the housing 2 is configured to include an upper housing 2a and a lower
housing 2b respectively formed of a synthetic resin, and is formed at each end of the both
housings 2a and 2b. By being fitted together and integrally connected by the fitting portion, it is
configured as an elongated pencil type as a whole.
Further, a partition plate 21 is provided in the upper housing 2a, and the acoustic signal
amplifier 3 is housed in an inner space on the rear end side partitioned by the partition plate 21,
and the power supply unit 4 is a partition plate It is accommodated in the internal space by the
side of the tip part divided by 21. On the other hand, in the lower housing 2b, a partition plate 22
for partitioning the power supply unit 4 and the vibration conversion unit 5 is fixed.
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[0019]
As shown in FIG. 2, the acoustic signal amplification unit 3 amplifies the acoustic signal input
from the outside via the acoustic signal cable 6 and outputs the generated drive current to the
drive coil 54 via a connection cable (not shown). . Further, as shown in FIG. 1, the acoustic signal
amplification unit 3 includes an amplifier substrate 31 disposed on the rear end side of the upper
housing 2a, and the amplifier substrate 31 includes, as shown in FIG. A power switch 32 and an
acoustic signal input connector 33 are mounted. In this case, as shown in the figure, the power
switch 32 is configured to include a knob 34 that can turn on / off the power of the pencil type
speaker 1 by switching. Further, as shown in the figure, the sound signal input connector 33 is
configured as a jack into which the plug 61 of the sound signal cable 6 for inputting the sound
signal from the outside can be inserted.
[0020]
As an example, as shown in FIGS. 1 and 2, the power supply unit 4 includes three dry batteries
41, 41 and 41, a dry battery terminal 42 fixed to the partition plate 21, and a dry battery
terminal 43 fixed to the partition plate 22. And supplies power to the acoustic signal
amplification unit 3 via a connection cable connected to the dry cell terminals 42 and 43. In this
case, the dry battery 41 is taken in and out from the opening on the tip end side of the upper
housing 2a in a state in which the fitting portion is removed and the lower housing 2b is
separated.
[0021]
The vibration conversion unit 5 is disposed in the inner space of the lower housing 2b, and
includes a columnar magnetostrictive element 51, bias magnets 52 and 53, and a drive coil 54,
as shown in FIGS. The columnar magnetostrictive element 51 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 51 is formed of, for example, a super magnetostrictive material having
a central composition Tb0.34-Dy0.66-Fe1.90 which causes a large displacement of about 1500
ppm to 2000 ppm in the axial direction in the magnetic field. It is done. One end of the columnar
magnetostrictive element 51 on the side of the partition plate 22 corresponds to the fixed end in
the present invention, and the other end on the side of the bias magnet 53 corresponds to the
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free end in the present invention.
[0022]
The bias magnet 52 is, for example, a permanent magnet formed in a disk shape having a
diameter substantially the same as the diameter of the columnar magnetostrictive element 51,
and one end surface thereof is one side of the upper case 2 a of the columnar magnetostrictive
element 51. It adheres in the state which contact | abutted to the end surface, and it adheres in
the state which the other end surface contact | abutted to the partition plate 22. As shown in FIG.
The bias magnet 53 (permanent magnet in the present invention) is a permanent magnet formed
in a disk shape having a diameter slightly larger than the diameter of the housing 2 as an
example, It adheres in the state which contact | abutted to the other end surface on the opposite
side to 2a. In this case, the bias magnets 52 and 53 apply a bias magnetic field so that the
columnar magnetostrictive element 51 can be operated at an operating point that linearly
expands and contracts (oscillates) with respect to fluctuations of the magnetic field in the axial
direction. Further, as shown in FIG. 1, the bias magnet 53 adsorbs the magnetic body 8 through
the glass plate 7 in a state in which the tip surface is in contact with the glass plate 7. Therefore,
by sandwiching the glass plate 7 between the bias magnet 53 and the magnetic body 8, the
pencil type speaker 1 can be easily attached (fixed) to the glass plate 7. In the lower housing 2b,
a holding portion (not shown) capable of holding the columnar magnetostrictive element 51
horizontally is formed, and as shown in the figure, the casing is not damaged without damaging
the columnar magnetostrictive element 51. It is possible to fix the bias magnet 53 so that the
body 2 is horizontal. The drive coil 54 corresponds to a magnetic field generation unit in the
present invention, and as shown in FIGS. 1 and 2, the drive coil 54 is disposed such that its
central axis is coaxial with the central axis of the columnar magnetostrictive element 51. Further,
as shown in FIG. 2, the drive coil 54 receives a drive current from the acoustic signal amplifier 3
via the connection cable, and generates a magnetic field on the axis thereof (the axis of the
columnar magnetostrictive element 51).
[0023]
Next, the overall operation of the pencil-type speaker 1 will be described.
[0024]
As shown in FIG. 1, in a state where the tip end surface of the bias magnet 53 is in contact with
the glass plate 7, the magnetic material 8 on the back surface side of the glass plate 7 is attracted
04-05-2019
9
to the bias magnet 53 via the glass plate 7. Thus, the pencil type speaker 1 is attached to the
glass plate 7.
In this state, in the pencil type speaker 1, the acoustic signal amplifier 3 amplifies an acoustic
signal input from the outside through the acoustic signal cable 6 and supplies a drive current to
the drive coil 54. At this time, the drive coil 54 applies a magnetic field generated based on the
supplied drive current to the columnar magnetostrictive element 51. Therefore, the columnar
magnetostrictive element 51 expands and contracts in the axial direction according to the
applied magnetic field. At this time, the partition plate 22 functions as a stopper (that is, the
weight of the pencil type speaker 1 is an inertial mass), whereby the vibration due to the
expansion and contraction of the columnar magnetostrictive element 51 is transmitted to the
glass plate 7 through the bias magnet 53. Ru. In this state, when the glass plate 7 vibrates, an
acoustic signal input from the outside is output from the glass plate 7 as a sound that can be
sufficiently heard.
[0025]
Thus, according to this pencil type speaker 1, although it is a simple fixing method in which the
magnetic material 8 on the back side is adsorbed to the bias magnet 53 of the pencil type
speaker 1 via the glass plate 7, The pencil type speaker 1 can be easily attached to and detached
from the vibration transfer target object capable of adsorbing the magnetic body 8 by the bias
magnet 53 sandwiching the vibration transfer target object.
[0026]
The present invention is not limited to the above configuration.
For example, although the configuration in which the bias magnet 53 is disposed on the other
end side of the columnar magnetostrictive element 51 has been described above, the magnetic
substance 55 is replaced with the columnar magnetostrictive element 51 instead of the bias
magnet 53 as in the pencil type speaker 1A shown in FIG. The structure fixed to the other end
side of (arrangement) is also employable. In addition, about the component which has the
function same as the component of the pencil type speaker 1 hereafter, the same code | symbol
is attached | subjected and the duplicate description is abbreviate | omitted. In this case, in this
pencil type speaker 1A, as shown in the figure, the bias magnet 10 for applying a bias magnetic
field to the columnar magnetostrictive element 51 in a state where the end face of the magnetic
body 55 is in contact with the glass plate 7. It is attached to the glass plate 7 by adsorbing the
04-05-2019
10
magnetic body 55 through the glass plate 7. This pencil type speaker 1A is also a simple fixing
method in which the magnetic body 55 of the pencil type speaker 1 is adsorbed to the bias
magnet 10 through the glass plate 7, but a bias is applied across an arbitrary vibration
transmission object The pencil-type speaker 1A can be easily attached to and detached from the
vibration transfer target object to which the magnet 10 can adsorb the magnetic body 55.
[0027]
Next, the configuration of the speaker 11 to which the speaker according to the present
invention is applied will be described with reference to the drawings. In the following,
components having the same functions as the components of the pencil-type speaker 1 will be
assigned the same reference numerals and redundant explanations will be omitted.
[0028]
As shown in FIG. 4, the speaker 11 is formed of a wood board, has an opening 12 a formed on
one side thereof, and has a box-like housing 12 for housing the pencil type speaker 1 and a
housing 2 for fixing the housing 2. A magnetic body 8 is provided. A diaphragm (a vibration
transmitting object in the present invention) 13 made of, for example, plywood plywood is
detachably fitted in the opening 12a of the housing 12, and the diaphragm 13 and the housing
12 may be combined. Function as a resonance box. Further, an insertion hole 12 b for drawing
out the acoustic signal cable 6 is formed on the back surface of the housing 12 opposite to the
diaphragm 13.
[0029]
Next, the overall operation of the speaker 11 will be described.
[0030]
First, the pencil-type speaker 1 is attached to the housing 12.
Specifically, in a state where the diaphragm 13 is removed from the housing 12 and the magnetic
body 8 is pressed against one surface of the diaphragm 13, the bias magnet 53 of the pencil type
04-05-2019
11
speaker 1 is pressed against the other surface of the diaphragm 13. . At this time, the magnetic
body 8 is adsorbed in a state in which the bias magnet 53 and the magnetic body 8 sandwich the
diaphragm 13. Therefore, the pencil-type speaker 1 is attached (fixed) to the diaphragm 13.
Then, after the diaphragm 13 to which the pencil type speaker 1 is attached is fitted into the
opening 12a of the housing 12, the acoustic signal cable 6 is pulled out from the insertion hole
12b and connected to an acoustic device (not shown). Thereby, the pencil type speaker 1 is easily
attached to the housing 12.
[0031]
On the other hand, when sound is output from the speaker 11, the acoustic signal amplifier 3
amplifies an acoustic signal input from the outside through the acoustic signal cable 6 and
supplies a drive current to the drive coil 54. At this time, the drive coil 54 applies a magnetic
field generated based on the supplied drive current to the columnar magnetostrictive element 51.
Therefore, the columnar magnetostrictive element 51 expands and contracts in the axial
direction according to the applied magnetic field. At this time, the partition plate 22 functions as
a stopper (that is, the weight of the housing 2 is an inertial mass), whereby the vibration due to
the expansion and contraction of the columnar magnetostrictive element 51 is transmitted to the
diaphragm 13 via the bias magnet 53. . In this state, the sound generated by the vibration of the
diaphragm 13 is directly output from the diaphragm 13 and the sound resonated by the housing
12 is output. Therefore, a sufficient audible sound is output from the speaker 11.
[0032]
As described above, although the magnetic magnet 8 is adsorbed by the bias magnet 53 via the
diaphragm 13 in a simple fixing method, the bias magnet 53 can be a magnetic body 8 with an
arbitrary vibration transmitting object (diaphragm 13) interposed. The pencil type speaker 1 can
be easily attached to and detached from the vibration transmitting object capable of adsorbing
the light. Therefore, since any diaphragm 13 can be easily replaced, various sound quality can be
sufficiently enjoyed and the design change of the speaker 11 can be sufficiently enjoyed.
[0033]
In addition, as in the speaker 11A shown in FIG. 5, the above-described pencil type speaker 1A
can be used. The speaker 11A is formed of a wood board and has an opening 14a formed on one
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12
side thereof, and is configured to include a box-like housing 14 for accommodating the penciltype speaker 1A. In this case, the housing 14 constitutes a vibration transfer target in the present
invention. In the following, components having the same functions as the components of the
speaker 11 are denoted by the same reference numerals, and redundant description will be
omitted.
[0034]
Next, the overall operation of the speaker 11A will be described.
[0035]
First, the pencil-type speaker 1A is attached to the housing.
Specifically, in a state where the bias magnet 10 is pressed against one surface of the housing 14,
the magnetic body 55 of the pencil-type speaker 1A is pressed from the back surface side of the
one surface. At this time, the magnetic body 55 is adsorbed in a state where the bias magnet 10
sandwiches one surface of the housing 14 together with the magnetic body 55. Therefore, the
pencil-type speaker 1A is attached (fixed) to the housing 14. Next, the audio signal cable 6 drawn
out from the insertion hole 14a is connected to an audio device (not shown). Thereby, the pencil
type speaker 1A is easily attached to the housing 14.
[0036]
On the other hand, when outputting sound from the speaker 11A, in the same manner as the
speaker 11, the acoustic signal amplifier 3 amplifies the acoustic signal input from the outside
through the acoustic signal cable 6 and drives the drive current to the drive coil 54. The
columnar magnetostrictive element 51 is contracted by the supply. At this time, the vibration due
to the expansion and contraction is transmitted to one surface of the housing 14 via the magnetic
body 55. In this state, the sound generated by the vibration of the housing 14 is directly output,
and the sound resonated by the housing 14 is also output. Therefore, a sufficient audible sound is
output from the speaker 11A.
[0037]
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13
As described above, although a simple fixing method of causing the magnetic body 55 to be
adsorbed to the bias magnet 10 via one surface of the housing 14, the bias magnet 10 is
magnetic with an arbitrary vibration transmitting object (housing 14) interposed therebetween.
The pencil type speaker 1 can be easily attached to and detached from the vibration transfer
target object capable of adsorbing the body 55. Therefore, since any housing 14 can be easily
replaced, various sound quality can be sufficiently enjoyed and the design change of the speaker
11A can be sufficiently enjoyed.
[0038]
The present invention is not limited to the above configuration. For example, in the pencil type
speakers 1 and 1A and the speakers 11 and 11A described above, an example in which the dry
battery 41 is disposed inside the housing 2 has been described, but instead of the dry battery 41,
DC power is externally output through a power cable. It is also possible to adopt a configuration
in which the power is supplied to the housing 2 or a configuration in which a commercial AC
power supplied via a power cable is converted into a DC power inside the housing 2. Further,
although the configuration in which the power switch 32 is disposed in the housing 2 has been
described, a configuration in which the power switch 32 is drawn out from the housing 2 with a
connection cable can also be adopted.
[0039]
Although the speaker 11 or 11A in which the vibration transmitting object in the present
invention is configured by the diaphragm 13 or the housing 14 is described as an example, the
vibration transmitting object is not limited to this, and one flat plate It can be configured in an
arbitrary shape such as a frame.
[0040]
Furthermore, although the above describes the pencil-type speakers 1 and 1A and the speakers
11 and 11A having a configuration in which one columnar magnetostrictive element 51 is
disposed, the number of columnar magnetostrictive elements 51 is not limited to one, and a
plurality may be disposed. it can.
[0041]
04-05-2019
14
FIG. 1 is a cross-sectional view showing a configuration of a pencil type speaker 1;
It is a block diagram which shows the electric circuit of the pencil type | mold speaker 1 (1A).
It is a sectional view showing the composition of pencil type speaker 1A. FIG. 2 is a crosssectional view showing a configuration of a speaker 11; It is a sectional view showing the
composition of speaker 11A.
Explanation of sign
[0042]
1, 1A pencil type speaker 11, 11A speaker 7 glass plate 8, 55 magnetic body 10, 53 bias magnet
12, 14 case 13 diaphragm 22 partition plate 51 columnar magnetostrictive element 54 drive coil
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