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JP2005094448

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DESCRIPTION JP2005094448
The present invention provides an electromagnetic transducer and an acoustic radiation device
having improved frequency characteristics and distortion factor characteristics by eliminating
resonance of components including a metal material forming a magnetic path. A magnetostrictive
element (11) is received at one end by a bottom (42). The permanent magnet 13 is constituted by
a cylinder, accommodates the bobbin 19, the coil 17 and the magnetostrictive element 11, and
together with the bottom portion 42 and the yoke member 14, constitutes a magnetic circuit for
applying a magnetic bias to the magnetostrictive element 11. The yoke member 14 has a through
hole 15. One end of the expansion / contraction transmission member 5 is connected to the
other end of the magnetostrictive element 11 through the through hole 15, and the other end is
guided to the outside through the opening 411 of the exterior body 4. [Selected figure] Figure 1
Electromagnetic converter for acoustic radiation device and acoustic radiation device
[0001]
The present invention relates to an electromagnetic transducer for an acoustic radiation device
and an acoustic radiation device using the same.
[0002]
In this type of acoustic radiation apparatus, an input signal is applied to a coil wound around a
cylindrical portion of a bobbin to cause expansion / contraction vibration in the magnetostrictive
element, and the expansion / contraction vibration is directly or indirectly applied to the
expansion / contraction end of the magnetostrictive element. The sound is generated by
transmitting to the diaphragm through the component parts that are in contact with each other,
and generally used as a speaker.
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1
[0003]
In the above-described acoustic radiation device, when an acoustic resonance caused by the
expansion and contraction (vibration) of the magnetostrictive element occurs in a component in
contact with the expansion and contraction end of the magnetostrictive element, the vibration
(resonance) other than the input signal is transmitted to the diaphragm. Since it is transmitted
and causes deterioration of frequency characteristics and distortion characteristics, acoustic
resonance must be suppressed.
[0004]
In particular, since this type of acoustic radiation device requires a magnet and a yoke member
for applying a magnetic bias to the magnetostrictive element, the acoustic resonance
phenomenon in these magnetic circuit components must be avoided.
A magnetic metal material is used for the magnetic circuit component.
Generally, metal materials have strong resonance characteristics, so when resonance occurs in
the magnetic circuit component due to expansion and contraction of the magnetostrictive
element, vibrations other than the input signal are transmitted to the diaphragm, resulting in
frequency characteristics and distortion. It is because it becomes a factor of deterioration of rate
characteristics.
[0005]
Patent Document 1 includes a movable yoke which is disposed at the center of an annular yoke
with a predetermined clearance and is interposed between a giant magnetostrictive rod and an
actuator rod (magnetostrictive expansion / contraction transmission member). Discloses a
structure in which the actuator rod is suspended by a plate spring so that noise does not occur or
the sliding friction resistance does not change when the i.
However, the resonance of the yoke made of a metallic material is not disclosed at all.
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[0006]
Further, the vibration drive device disclosed in Patent Document 2 has a configuration in which
the stretchable end of the magnetostrictive stretch transmission member is directly coupled to
the vibrator for sound generation, and means for reducing acoustic noise due to resonance is
disclosed. It has not been. Japanese Patent Application Laid-Open No. 10-145892 Japanese
Patent Application Laid-open No. 4-1313998
[0007]
An object of the present invention is to provide an electromagnetic transducer and an acoustic
radiation device for an acoustic radiation device in which frequency characteristics and distortion
factor characteristics are improved by eliminating resonance of a component including a metal
material forming a magnetic path. is there.
[0008]
Another object of the present invention is an acoustic radiation device capable of reducing stress
on a magnetostrictive element and suppressing deterioration of element strength with time by
eliminating resonance of a component including a metal material forming a magnetic path. An
electromagnetic conversion device and an acoustic radiation device.
[0009]
In order to solve the problems described above, the present invention discloses two aspects of an
electromagnetic transducer for an acoustic radiation device and an acoustic radiation device.
[0010]
1. Electromagnetic Converter for Acoustic Radiation Device The electromagnetic transducer for
acoustic radiation device according to the first aspect of the present invention includes an
exterior body, a coil bobbin, a magnetostrictive element, a permanent magnet, a yoke member,
and an extension transmission member. .
The exterior body has an inner space and a bottom.
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The inner space is closed at its one end by the bottom and has an opening at the other end
opposite to the bottom.
The coil bobbin, the magnetostrictive element, the permanent magnet, the yoke member, and the
expansion / contraction transmission member are disposed in the internal space.
[0011]
The coil bobbin includes a bobbin and a coil, and the coil is wound around an outer peripheral
surface of a cylindrical portion of the bobbin. The magnetostrictive element is inserted into the
cylindrical portion of the bobbin. In the coil bobbin and the magnetostrictive element, one end of
the opposite ends is received by the bottom of the package.
[0012]
The permanent magnet has a cylindrical shape and accommodates the coil bobbin and the
magnetostrictive element inside, and is disposed in the internal space of the exterior body, and
one end of the opposite ends is received by the bottom portion of the exterior body The other
end is received by a step formed on the inner wall of the inner space of the outer package.
[0013]
The yoke member is an annular disc body having a through hole penetrating in a thickness
direction, and is disposed on the other end side of the coil bobbin and the magnetostrictive
element, and together with the permanent magnet and the bottom portion of the exterior body. A
magnetic circuit is configured to apply a magnetic bias to the magnetostrictive element.
The other end of the yoke member is joined to the expansion / contraction transmission member.
[0014]
One end of the stretch transmission member is led to the outside through the opening, and the
other end side is connected to the other end side of the magnetostrictive element through the
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through hole.
[0015]
In the above-described electromagnetic transducer for an acoustic radiation device according to
the present invention, the coil bobbin, the magnetostrictive element, the permanent magnet, the
yoke member and the expansion / contraction transmission member are disposed in the internal
space of the exterior body. can do.
[0016]
Since the magnetostrictive element is inserted into the cylindrical portion of the bobbin and the
coil is wound around the outer peripheral surface of the cylindrical portion of the bobbin, the
bobbin can prevent the deterioration and damage of the coil accompanying the stretching
vibration of the magnetostrictive element .
[0017]
The permanent magnet is disposed in the inner space of the outer package, one end of the
opposite ends is received by the bottom of the outer package, and the other end is received by
the step formed on the inner wall surface of the inner space of the outer package. Therefore, it is
reliably held inside the exterior body.
[0018]
The yoke member is an annular disc and is disposed on the other end side of the coil bobbin and
the magnetostrictive element, and forms a magnetic circuit for applying a magnetic bias to the
magnetostrictive element together with the permanent magnet and the bottom of the outer
package. There is.
According to this structure, for the magnetostrictive element, a pseudo closed magnetic circuit
with high magnetic efficiency can be formed over the entire circumference.
For this reason, when an AC input signal is applied to the coil to cause expansion / contraction
vibration in the magnetostrictive element, highly efficient expansion / contraction vibration can
be generated.
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[0019]
Since the expansion / contraction transmission member has one end led to the outside and the
other end connected to the other end of the magnetostrictive element, the expansion /
contraction vibration of the magnetostrictive element is transmitted to the expansion /
contraction transmission member, and the expansion / contraction transmission member is the
expansion / contraction vibration of the magnetostrictive element Receive vibration and vibrate.
[0020]
Since the other end side of the expansion / contraction transmission member is connected to the
other end side of the magnetostrictive element through the through hole provided in the yoke
member, the magnetostrictive element does not directly contact the yoke member.
For this reason, strong resonance vibration is not generated in the component including the yoke
member and the metal material forming the magnetic path, and resonance of the component can
be avoided.
Therefore, the generation of the vibration not depending on the input signal is suppressed, the
acoustic noise due to the resonance can be reduced, and the frequency characteristic and the
distortion factor characteristic can be improved.
[0021]
Further, since strong resonance vibration is not generated in the component including the metal
material forming the magnetic path, the stress on the magnetostrictive element due to the
resonance of the component can be reduced, and the temporal deterioration of the
magnetostrictive element strength can be suppressed.
[0022]
A feature of the electromagnetic transducer for an acoustic radiation device according to the
second aspect of the present invention is that it has a magnetostrictive element receiving
member.
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The magnetostrictive element receiving member is made of a material mainly composed of a
polymer material, and is disposed on the other end side of the coil bobbin and the
magnetostrictive element, and receives the other end of the magnetostrictive element on one
side.
One end of the expansion / contraction transmission member is led to the outside through the
opening, and the other end side is connected to the other end side of the magnetostrictive
element through the yoke member and the magnetostrictive element receiving member. Unlike
the first aspect, the yoke member has no through hole.
[0023]
In the structure of the electromagnetic transducer for an acoustic radiation device of the second
embodiment, the magnetostrictive element and the expansion / contraction transmission member
are connected via the yoke member and the magnetostrictive element receiving member mainly
composed of a polymer material, The magnetostrictive element does not directly contact the yoke
member. For this reason, similarly to the first aspect, strong resonance vibration is not generated
in the component including the yoke member and the metal material constituting the magnetic
path due to the stretching vibration of the magnetostrictive element, and the component
Resonance can be avoided. Therefore, the generation of the vibration not depending on the input
signal is suppressed, the acoustic noise due to the resonance can be reduced, and the frequency
characteristic and the distortion factor characteristic can be improved.
[0024]
Further, since strong resonance vibration is not generated in the component including the metal
material forming the magnetic path, the stress on the magnetostrictive element due to the
resonance of the component can be reduced, and the temporal deterioration of the
magnetostrictive element strength can be suppressed.
[0025]
2. Acoustic radiation apparatus The acoustic radiation apparatus according to the present
invention includes an electromagnetic transducer for acoustic radiation apparatus and a
diaphragm.
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The electromagnetic transducer for the acoustic radiation device is the above-described first or
second electromagnetic transducer for the acoustic radiation device according to the present
invention. The diaphragm is connected to the expansion / contraction transmission member.
[0026]
Since the acoustic radiation device according to the present invention uses the first or second
electromagnetic transducer for acoustic radiation device according to the present invention
described above, it is possible to use the first or second electromagnetic transducer for acoustic
radiation device according to the present invention The effect can be obtained as it is.
[0027]
As described above, according to the present invention, the following effects can be obtained.
[0028]
(A) By eliminating the resonance of the component including the metal material constituting the
magnetic path, it is possible to provide an electromagnetic conversion device and an acoustic
radiation device having improved frequency characteristics and distortion factor characteristics.
[0029]
(B) An electromagnetic transducer for acoustic radiation device and acoustic radiation capable of
reducing stress on the magnetostrictive element and suppressing deterioration with time of the
element strength by eliminating resonance of components including a metal material constituting
a magnetic path An apparatus can be provided.
[0030]
1.
Electromagnetic Converter for Acoustic Radiation Device FIG. 1 is a front sectional view showing
the electromagnetic transducer for acoustic radiation device according to the first aspect of the
present invention.
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The illustrated electromagnetic converter for an acoustic radiation device includes an exterior
body 4, an expansion / contraction transmission member 5, a pressure application member 6, a
magnetostrictive element 11, a permanent magnet 13, a yoke member 14, a coil 17, and a
bobbin 19. And.
The coil 17 and the bobbin 19 constitute a coil bobbin.
[0031]
The exterior body 4 is made of a rigid material such as a metal material, and has an internal
space 415 and a bottom 42.
The exterior body 4 has a structure in which a bottom portion 42 is fitted into one end of a
cylindrical portion 41 and fixed by a fastener 45 such as a screw, and has an opening 411 on the
side opposite to the bottom portion 42 . The opening 411 has an inward flange 412 formed at
the other end of the cylindrical portion 41. The expansion / contraction transmission member 5,
the pressure application member 6, the magnetostrictive element 11, the permanent magnet 13,
the yoke member 14, the coil 17 and the bobbin 19 are accommodated in the internal space 415
of the exterior body 4.
[0032]
The bobbin 19 has a cylindrical portion 190 and flange portions 191 and 192 at both ends
thereof, and the coil 17 is wound around the outer peripheral surface of the cylindrical portion
190 of the bobbin 19. The magnetostrictive element 11 is inserted into the cylindrical portion
190 of the bobbin 19. The illustrated magnetostrictive element 11 is rod-shaped. The collar 191
of the bobbin 19 is fitted into a step 421 provided on the inner surface of the bottom 42. One
end of the magnetostrictive element 11 abuts against the step 421 and is received by the bottom
42.
[0033]
The permanent magnet 13 is formed of a cylindrical body and accommodates the
magnetostrictive element 11, the coil 17 and the bobbin 19 inside, and is disposed in the internal
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space 415 of the exterior body 4, and one end of the opposite ends is the exterior body 4, and
the other end is received by a step 414 formed on the inner wall of the inner space 415 of the
outer package 4.
[0034]
The yoke member 14 is an annular disc in which a through hole 15 penetrating in the thickness
direction is opened at the central portion.
The yoke member 14 forms a pseudo closed magnetic path together with the permanent magnet
13 and the bottom 42, and applies a magnetic bias to the magnetostrictive element 11.
[0035]
One end side of the expansion / contraction transmission member 5 is connected to the other
end side of the magnetostrictive element 11 through the through hole 15, and the other end is
led to the outside through the opening 411. The expansion / contraction transmission member 5
is preferably made of a material containing a polymer material as a main component. The
illustrated expansion / contraction transmission member 5 is provided with a recess 53 for
receiving the magnetostrictive element 11 at one end side connected to the magnetostrictive
element 11. The connection portion between the expansion / contraction transmission member 5
and the magnetostrictive element 11 may be provided in the cylindrical portion 190 by
extending one end of the expansion / contraction transmission member 5 into the cylindrical
portion 190 of the bobbin 19. 11 may be configured to penetrate the through hole 15 of the
yoke member 14 and to receive the magnetostrictive element 11 by providing a recess 53 near
the other end of the expansion / contraction transmission member 5.
[0036]
The body 54 of the expansion / contraction transmission member 5 is stepped, and a screw 55 is
provided at the tip of the other end which is led to the outside. A flange 52 is provided at the rear
end of the body 54.
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[0037]
The pressure member 6 is interposed between the exterior body 4 and the expansion /
contraction transmission member 5 and biases the expansion / contraction transmission member
5 in the direction of the magnetostrictive element 11. The pressure member 6 may be a metal
plate spring or a metal coil spring, but preferably is an elastic material mainly composed of a
polymer material. Specifically, it is polymer rubber or polymer plastic having a certain elastic
modulus. These may be a single material of a polymeric material, or may be a composite material
in which an inorganic powder or the like is added to the polymeric material.
[0038]
The pressurizing member 6 of the embodiment has a cylindrical shape, and one end seen in the
axial direction of the cylindrical body is received by the exterior body 4, and the other end is
formed by the flange portion 52 of the expansion and contraction transmitting member 5.
Received by
[0039]
The pressurizing member 6 is disposed so as to surround the body 54 of the expansion /
contraction transmission member 5 and includes a step 56 constituted by a flange 52 provided
at an end of the body 54 and a flange 72 of the spacer 7. It is compressed between the steps 73.
[0040]
In the illustrated embodiment, the spacer 7 is included, and the spacer 7 is inserted between the
exterior body 4 and the stretch transmission member 5.
The spacer 7 is also preferably made of a material containing a polymer material as a main
component.
The spacer 7 has a collar 72, which overlaps the inner surface 413 of the inward collar 412 of
the sheath 4 and is supported thereby.
[0041]
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11
In the electromagnetic conversion device according to the present invention described above, the
expansion / contraction transmission member 5, the pressure member 6, the magnetostrictive
element 11, the permanent magnet 13, the yoke member 14, the coil 17 and the bobbin 19 are
accommodated in the internal space 415 of the exterior body 4. Therefore, the whole can be
protected by the exterior body 4.
[0042]
The exterior body 4 has a bottom 42, and one end of the opposite ends of the magnetostrictive
element 11 is received by the bottom 42.
One end side of the expansion / contraction transmission member 5 is connected to the other
end side of the magnetostrictive element 11. The pressure member 6 is interposed between the
exterior body 4 and the expansion / contraction transmission member 5 and biases the
expansion / contraction transmission member 5 in the direction of the magnetostrictive element
11. Therefore, the pressurization can be applied to the magnetostrictive element 11 from the
pressurization member 6 through the expansion / contraction transmission member 5.
[0043]
Furthermore, the permanent magnet 13 is disposed in the internal space 415 of the exterior
body 4, one end of the opposite ends is received by the bottom portion 42 of the exterior body 4,
and the other end is formed on the inner wall surface of the internal space 415 of the exterior
body 4 Since it is received by the stepped portion 414, it is reliably held inside the exterior body
4.
[0044]
The yoke member 14 is formed of an annular disc, disposed on the other end side of the bobbin
19, the coil 17 and the magnetostrictive element 11, and applies a magnetic bias to the
magnetostrictive element 11 together with the permanent magnet 13 and the bottom portion 42
of the exterior body 4. Constitute a magnetic circuit.
According to this structure, for the magnetostrictive element 11, a pseudo closed magnetic path
with high magnetic efficiency can be formed over the entire circumference. Therefore, when the
04-05-2019
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AC input signal is applied to the bobbin 19 to cause the magnetostrictive element 11 to generate
stretching vibration, it is possible to generate highly efficient stretching vibration.
[0045]
Since one end of the expansion / contraction transmission member 5 is led to the outside and the
other end is connected to the other end of the magnetostrictive element 11, the expansion /
contraction vibration of the magnetostrictive element 11 is transmitted to the expansion /
contraction transmission member 5, and the expansion / contraction transmission member 5 It
vibrates by receiving the expansion and contraction vibration of the magnetostrictive element 11.
[0046]
Since one end of the expansion / contraction transmission member 5 is led to the outside
through the opening 411 of the exterior body 4 and the other end is connected to the other end
of the magnetostrictive element 11 through the through hole 15, the magnetostrictive element
11 is a yoke member Do not touch 14 directly.
For this reason, strong resonance vibration is not generated in the component including the
metal material constituting the magnetic path, including the yoke member 14 due to the
expansion and contraction vibration of the magnetostrictive element 11, and the resonance of
the component can be avoided. Therefore, the generation of the vibration not depending on the
input signal is suppressed, the acoustic noise due to the resonance can be reduced, and the
frequency characteristic and the distortion factor characteristic can be improved.
[0047]
Further, since strong resonance vibration is not generated in the component including the metal
material forming the magnetic path, the stress to the magnetostrictive element 11 due to the
resonance of the component is reduced, and the time-dependent deterioration of the strength of
the magnetostrictive element 11 is suppressed. It can.
[0048]
The magnetostrictive element 11 is inserted inside the cylindrical portion 190 of the bobbin 19,
and the coil 17 is wound around the outer peripheral surface of the cylindrical portion 190 of
the bobbin 19. Degradation and damage can be prevented by the bobbin 19.
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[0049]
The internal space 415 of the exterior body 4 has an opening 411 on the side facing the bottom
42, and the other end of the expansion / contraction transmission member 5 is led to the outside
through the opening 411 of the exterior body 4, The vibration output of the expansion /
contraction transmission member 5 can be taken out to the outside.
[0050]
In the present embodiment, the pressurizing member 6, the expansion / contraction transmitting
member 5 and the spacer 7 are also made of a material mainly composed of a polymer material.
In this case, no strong resonance vibration is generated for all the components directly and
indirectly coupled between the expansion end of the magnetostrictive element 11 and the
exterior body 4.
Therefore, the generation of vibrations other than the input signal can be suppressed more
completely, and further excellent frequency characteristics and distortion factor characteristics
can be obtained.
[0051]
FIG. 2 is a front sectional view showing an electromagnetic transducer for an acoustic radiation
device according to a second aspect of the present invention.
In the illustrated electromagnetic transducer for an acoustic radiation device, the portions
denoted with the same reference numerals as those in FIG. 1 indicate the same components, and
redundant description of the common portions will be omitted.
[0052]
The electromagnetic conversion device for an acoustic radiation device according to the second
aspect of the present invention illustrated in FIG. 2 has the configuration of the yoke member
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and the connection between the magnetostrictive element 11 and the expansion / contraction
transmission member 5 in comparison with the first aspect. Although the configuration is
different, the other configuration is the same as the first aspect.
[0053]
In the electromagnetic transducer for an acoustic radiation device according to the second aspect
of the present invention, as in the first aspect, one of the permanent magnet and the yoke
member is constituted by a cylinder and the other is constituted by a yoke member. However, the
yoke member has a disc shape, and a magnetostrictive element receiving member mainly
composed of a polymer material is provided on the magnetostrictive element side.
As in the first embodiment, either the permanent magnet or the yoke member may be a
cylindrical body, and either may be a yoke member.
[0054]
In the illustrated embodiment, the permanent magnet 13 is a cylindrical body, and the yoke
member 14 is a disk-shaped yoke member. The disk-shaped yoke member 14 is provided with a
magnetostrictive element receiving member 16 mainly composed of a polymer material on the
magnetostrictive element 11 side. In the embodiment, the magnetostrictive element receiving
member 16 is formed in the shape of a disc having the same size as the disc-like yoke member
14, and the concave portion 161 for receiving the magnetostrictive element 11 is formed in the
central portion. The magnetostrictive element receiving member 16 may have any size and shape
as long as the magnetostrictive element 11 can be received without being in direct contact with
the disk-shaped yoke member 14, and the concave portion 161 may be omitted. The material of
the magnetostrictive element receiving member 16 may be a single material of a polymer
material, or may be a composite material in which an inorganic powder or the like is added to the
polymer material. It can also be used.
[0055]
One end side of the expansion / contraction transmission member 5 is connected to the other
end side of the magnetostrictive element 11 via the yoke member 14 and the magnetostrictive
element receiving member 16.
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[0056]
In the structure of the electromagnetic transducer for an acoustic radiation device of the second
embodiment, the magnetostrictive element 11 and the expansion / contraction transmission
member 5 are formed via the yoke member 14 and the magnetostrictive element receiving
member 16 mainly composed of a polymer material. Because they are connected, the
magnetostrictive element 11 does not directly contact the yoke member 14.
For this reason, similarly to the first aspect, strong resonance vibration is generated in the
component including the yoke member 14 and the metal material such as the permanent magnet
13 including the metal path due to the stretching vibration of the magnetostrictive element 11.
Instead, resonance of components can be avoided. Therefore, the generation of the vibration not
depending on the input signal is suppressed, the acoustic noise due to the resonance can be
reduced, and the frequency characteristic and the distortion factor characteristic can be
improved. In addition, other effects and effects can be obtained in the same manner as the first
embodiment.
[0057]
2. Acoustic Radiation Device FIG. 3 is a partial sectional view showing an embodiment of the
acoustic radiation device according to the present invention. In the figure, the same components
as those shown in FIG. 1 are designated by the same reference numerals, and the redundant
description will be omitted. The illustrated acoustic radiation device comprises an
electromagnetic transducer device 9 for acoustic radiation devices according to the first aspect of
the invention illustrated and described in FIG. 1 and a diaphragm 10. The diaphragm 10 is
connected to the expansion / contraction transmission member 5 of the electromagnetic
conversion device 9. In the illustrated embodiment, the diaphragm 10 is driven by the pressing
member 83 screwed to the tip of the expansion / contraction transmission member 5.
[0058]
Since the acoustic radiation device shown in FIG. 3 uses the electromagnetic transducer 9 for
acoustic radiation device according to the first aspect of the present invention, all the abovedescribed effects of the electromagnetic transducer 9 for acoustic radiation device can be
04-05-2019
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obtained. . That is, since the resonance of the component parts of the electromagnetic conversion
device 9 is eliminated, it is possible to obtain an acoustic radiation device having improved
frequency characteristics and distortion characteristics. In addition, it is possible to obtain an
acoustic radiation device capable of reducing stress on the magnetostrictive element 11 due to
the resonance of the component parts and suppressing deterioration with time of the element
strength.
[0059]
FIG. 4 is a partial sectional view showing another embodiment of the acoustic radiation device
according to the present invention. In the figure, the same reference numerals are given to the
same components as the components shown in FIG. 1 and FIG. The illustrated acoustic radiation
device includes the electromagnetic transducer 9 for acoustic radiation devices according to the
second aspect of the present invention illustrated and described in FIG. 2 and the diaphragm 10,
and the acoustic radiation device illustrated in FIG. And are combined as well. Since the acoustic
radiation device illustrated in FIG. 4 uses the electromagnetic transducer 9 for acoustic radiation
device according to the second aspect of the present invention, all the above-described effects of
the electromagnetic transducer 9 for acoustic radiation device can be obtained .
[0060]
Although the present invention has been described in detail with reference to the preferred
embodiments, the present invention is not limited thereto, and various modifications can be
made by those skilled in the art based on the basic technical concept and teaching thereof. It is
self-evident that
[0061]
It is front sectional drawing of the electromagnetic transducer for acoustic radiation devices
which concerns on a 1st aspect of this invention.
It is front sectional drawing of the electromagnetic transducer for acoustic radiation devices
which concerns on a 2nd aspect of this invention. It is a fragmentary sectional view showing one
example of an acoustic radiation device concerning the present invention. It is a fragmentary
sectional view which shows another one Example of the acoustic radiation apparatus based on
this invention.
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Explanation of sign
[0062]
DESCRIPTION OF SYMBOLS 4 exterior body 415 internal space 42 bottom 5 expansioncontraction transmission member 6 pressurization member 7 spacer 11 magnetostrictive
element 13 permanent magnet 14 yoke member 15 through-hole 16 magnetostrictive element
receiving member 17 coil 19 bobbin
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