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JP2012169901

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DESCRIPTION JP2012169901
The present invention provides an electrodynamic exciter which is less likely to deteriorate in
electrical / acoustic conversion characteristics or to be damaged by contact even when mounted
vertically on a vertical wall, and at the same time to improve low frequency characteristics on the
electrical / acoustic characteristics. . A magnetic circuit portion including a bowl-shaped outer
yoke, a magnet disposed so as to be surrounded by the bowl-shaped outer yoke, and an inner
yoke, and disposed in a magnetic gap formed in the magnetic circuit portion A coil, a diaphragm
to which the coil is fixed, and an elastic body that elastically connects the diaphragm and the
magnetic circuit unit such that the diaphragm and the magnetic circuit unit have a
predetermined gap. In the electric exciter, the elastic body is composed of at least two elastic
bodies of a first elastic body and a second elastic body, and the first elastic body and the second
elastic body are of the diaphragm. The vicinity of the outer periphery of the outer yoke and the
vicinity of the outer periphery of the diaphragm are connected so as to generate mutually
opposing pressing forces in the axial direction which is the vibration direction. [Selected figure]
Figure 1
Electrodynamic exciter
[0001]
The present invention is applied to a thin panel speaker utilized to achieve thinning of various
electronic devices such as a television and a personal computer, or an electrodynamic exciter
attached to an electric vehicle etc. and applied to the generation of notification sound Relates to
the structure of
[0002]
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1
2. Description of the Related Art An electrodynamic exciter has often been adopted for thin panel
speakers mounted on home appliances such as thin liquid crystal TVs, thin plasma TVs, thin
personal computers, and various monitor devices of industrial machine tools.
That is, the conventional dynamic exciter comprises a bowl-shaped inner yoke, a permanent
magnet, an outer yoke, a voice coil, a diaphragm, and an adhesive member, and a voice coil is
formed in the gap between the inner yoke and the outer yoke side wall. The diaphragm is
disposed integrally with the voice coil. A diaphragm in which a voice coil vibrates in the axial
direction and a voice coil is integrally fixed by supplying a current consisting of a predetermined
signal to a voice coil in a magnetic circuit composed of a permanent magnet, an inner yoke, and
an outer yoke. Emits a sound wave by exciting the
[0003]
For example, the electrodynamic exciter according to Patent Document 1 is integrated with a
voice coil by an elastic holding body having appropriate elasticity such as urethane foam on an
axial end face of a magnetic circuit consisting of an inner yoke, a magnet and an outer yoke. It
has a structure in which a vibrating member composed of a fixed diaphragm is attached.
[0004]
In addition, the dynamic exciter according to Patent Document 2 includes a magnetic circuit
formed of a bowl-shaped outer yoke, a plate-like magnet and an inner yoke sequentially stacked
inside the outer yoke, and an outer of the magnetic circuit. A voice coil disposed in an air gap
formed between an inner peripheral portion of a side wall of the yoke and an outer peripheral
portion of the inner yoke, and a sub-panel corresponding to a diaphragm holding the voice coil in
front of the magnetic circuit; It has a structure in which the vicinity of the center of gravity in the
thickness direction of the magnetic circuit and the sub-panel are held by a plurality of arc-shaped
strip-like thin elastic supports.
[0005]
JP 10-243491 JP JP 2003-143690 JP
[0006]
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2
These conventional electrodynamic exciters are widely used in electronic devices such as flatscreen TVs and flat-screen personal computers.
In particular, the market competition for these speakers for thin household appliances is
intensifying due to the small size, light weight, thinness, and low price, and the acoustic
performance improvement in the low frequency region is essential from the viewpoint of product
differentiation, and the prior art documents mentioned above The proposal for improvement is
made by
[0007]
When the diaphragm of the electrodynamic exciter disclosed in Patent Document 1 is mounted in
a horizontal state, no problem occurs, but when the diaphragm is mounted in an upright state,
the entire weight of the magnetic circuit of the exciter is elastically held Acts in the direction of
body shear.
For this reason, the lower the elastic constant of the elastic holding body, the larger the axial
misalignment of the voice coil axial center and the magnetic circuit and the inclination of the
axial center, and the air gap around the voice coil changes. There is a problem that the
characteristics change and the necessary frequency characteristics can not be obtained.
[0008]
Further, in home electric appliances such as televisions and personal computers, the vibration
resistance required for the speaker for home electric appliances hardly causes a problem because
the vibration of the main body is very small.
However, in the case of an on-vehicle speaker mounted on a mobile body with large vibration
such as an automobile, when the exciter's diaphragm is mounted in an upright state, the elastic
holder not only has static shear stress due to the weight of the magnetic circuit. Since the
dynamic alternating shear stress due to the vibration of the exciter mounting part is also added,
the shear stress for automotive use becomes significantly larger than when the exciter is
mounted on a home appliance, and the elastic support is broken, etc. mounting of the exciter
Depending on the direction, there was a problem that the reliability would be greatly reduced.
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[0009]
Patent Document 2 discloses one means for improving the problem of Patent Document 1. In
Patent Document 2, the elastic supporting member made of a thin metal plate supports the
vicinity of the center of gravity in the thickness direction of the magnetic circuit, thereby
degrading the electric / acoustic conversion characteristics even when the diaphragm is mounted
upright. In addition, there is disclosed an exciter (speaker) which is resistant to breakage due to
contact and is excellent in earthquake resistance that can operate even in an on-vehicle vibration
environment.
[0010]
According to this structure, when the diaphragm is mounted in an upright state, the rotational
moment due to the weight of the magnetic circuit can be reduced, but the strip-like thin plate
elastic holder does not have the security function and the waterproof structure can not be
obtained. is there. Therefore, when the exciter having such a structure is installed outside the
vehicle, the voice coil may be broken by the moisture entering the voice coil portion.
[0011]
The present invention has been made to solve the problems of the dynamic exciter used as the
conventional thin speaker as described above, and even if it is mounted on a vertical wall in the
vertical state, the electro-acoustic conversion characteristic is It is an object of the present
invention to provide an electrodynamic exciter which is less likely to cause deterioration due to
contact damage and is capable of improving the low frequency characteristics on the electrical /
acoustic characteristics at the same time.
[0012]
According to the present invention, there is provided a magnetic circuit portion including a bowlshaped outer yoke, a magnet disposed so as to be surrounded by the bowl-shaped outer yoke,
and an inner yoke, and a magnetic gap formed in the magnetic circuit portion. A coil, a
diaphragm to which the coil is fixed, and an elastic body that elastically connects the diaphragm
and the magnetic circuit unit such that the diaphragm and the magnetic circuit unit have a
predetermined gap. In the electric exciter, the elastic body is composed of at least two elastic
bodies of a first elastic body and a second elastic body, and the first elastic body and the second
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elastic body are of the diaphragm. The vicinity of the outer periphery of the outer yoke and the
vicinity of the outer periphery of the diaphragm are connected so as to generate mutually
opposing pressing forces in the axial direction which is the vibration direction.
[0013]
According to the present invention, an electrodynamic exciter which is less likely to cause
deterioration of the electrical / acoustic conversion characteristics and breakage due to contact
even when mounted vertically on a vertical wall, and at the same time to improve low frequency
characteristics on the electrical / acoustic characteristics. Is obtained.
[0014]
FIG. 1 is a schematic cross-sectional view showing a configuration of an electrodynamic exciter
according to Embodiment 1 of the present invention.
FIG. 1 is a schematic cross-sectional view of a state in which an electrodynamic exciter according
to a first embodiment of the present invention is laid on a vertical wall surface.
BRIEF DESCRIPTION OF THE DRAWINGS It is a fragmentary sectional view which shows the
structure of the principal part of the electrodynamic exciter by Embodiment 1 of this invention.
BRIEF DESCRIPTION OF THE DRAWINGS It is a perspective view which shows the external
appearance of the dynamic-dynamic type exciter by Embodiment 1 of this invention. It is a
schematic diagram which shows the relationship of the spring constant of a structure of the
electrodynamic exciter by Embodiment 1 of this invention. It is a fragmentary sectional view
which shows the structure of the principal part of the electrodynamic exciter by Embodiment 2
of this invention. It is a fragmentary sectional view which shows the structure of the principal
part of the electrodynamic exciter by Embodiment 3 of this invention. It is a fragmentary
sectional view which shows the structure of the principal part of the electrodynamic exciter by
Embodiment 4 of this invention. It is a fragmentary sectional view which shows the structure of
the principal part of the electrodynamic exciter by Embodiment 5 of this invention. It is a
perspective view which shows the external appearance of the electrodynamic exciter by
Embodiment 6 of this invention. It is sectional drawing which shows the structure of the
electrodynamic exciter by Embodiment 7 of this invention.
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[0015]
Embodiment 1 FIG. 1 is a schematic cross-sectional view showing a configuration of a dynamic
exciter according to a first embodiment of the present invention. FIG. 2 is a schematic crosssectional view of the state in which the electrodynamic exciter of FIG. 1 is laid on a vertical wall
surface, and FIG. 3 is a schematic cross-sectional view of the electrodynamic exciter according to
the first embodiment of the present invention. FIG. 2 is a partial cross-sectional view showing the
inside of a broken line circle in FIG. 1 in an enlarged manner in the vertical state as in FIG. FIG. 4
is a perspective view showing the overall appearance of the electrodynamic exciter according to
the first embodiment of the present invention. In FIG. 1, FIG. 2 and FIG. 3, a magnetic circuit is
constituted by an inner yoke 1 made of a magnetic material, a flat magnet 2 made of a rare earth
or the like, and an outer yoke 3 made of a magnetic material in a bowl shape. One surface of the
magnet 2 is in contact with the bowl-shaped inner bottom surface of the outer yoke 3 and the
other surface of the magnet 2 is in contact with the inner yoke 1 made of a magnetic material.
The outer yoke 3, the magnet 2 and the inner yoke 1 are respectively joined by an adhesive (not
shown), and a gap is formed between the radially outer peripheral surface of the inner yoke 1
and the inner peripheral wall surface of the bowl-shaped edge of the outer yoke 3. A magnetic
circuit is configured by holding it.
[0016]
A coil 5 wound around a bobbin 4 made of an insulating material is disposed to be located in a
gap portion (a gap) of a magnetic circuit, and the bobbin 4 around which the coil 5 is wound is
integrated by a thin flat diaphragm 6. Are held in
[0017]
The outer yoke 3 has a stepped portion 31 radially projecting at the central portion of the outer
wall surface in the axial direction (hereinafter simply referred to as the axial direction) of the
electrodynamic exciter, and the diaphragm 6 of the stepped portion 31 The opposite side has a
projection 32.
In addition, the diaphragm 6 has a frame portion 61 projecting in the axial direction in the
vicinity of the outer peripheral portion so as to face the convex portion 32 provided on the
stepped portion 31 of the outer yoke 3.
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[0018]
A ring-shaped elastic body (first elastic body) 7 is disposed so as to be sandwiched between the
stepped portion 31 of the outer yoke 3 and the radial end of the diaphragm 6. Furthermore, the
first elastic body 7 has an H shape in which a groove having a predetermined width and depth is
formed on both end surfaces in the axial direction, and a convex portion provided on the stepped
portion 31 of the outer yoke 3 32 and a frame portion 61 provided in the vicinity of the outer
peripheral portion of the diaphragm 6 are engaged with grooves formed on both axial end
surfaces of the first elastic body 7 in a meshing manner.
[0019]
A ring-shaped elastic body (second elastic body) 8 having a U-shaped cross-sectional shape is
engaged so as to press the stepped portion 31 of the outer yoke 3 and the radial end of the
diaphragm 6 closer to each other There is. The stepped portion 31 of the outer yoke 3 and the
fitting portion with the outer peripheral portion of the diaphragm 6 are more preferably
designed to prevent the second elastic body 8 from coming off.
[0020]
The appearance of the outer yoke 3 and the second elastic body 8 of the first embodiment is both
cylindrical as shown in FIG. 4, but the electrodynamic exciter to which the present invention can
be applied is a cylinder. It is not limited to the shape.
[0021]
The electrodynamic exciter thus configured includes the first elastic body 7 and the second
elastic body 8 with the outer yoke 3 constituting the magnetic circuit and the diaphragm 6
excited by energization of the coil 5. The spring constants of both elastic members are set so that
the axial pressing force of the first elastic body 7 and the pressing force of the second elastic
body 8 are balanced at a predetermined value.
[0022]
FIG. 5 is a schematic view for explaining the relationship of the spring constants of both elastic
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7
bodies, and in the figure, Kc shows the spring constant of the first elastic body 7 which generates
a pressing force by being deformed in the compression direction, and And Ke indicate the spring
constant of the second elastic body 8 in which the pressing force is generated by deformation in
the pulling direction.
Also, in the state where the first elastic body 7 and the second elastic body 8 are provided, a
predetermined gap L is provided between the end face in the axial direction of the outer yoke 3
constituting the magnetic circuit portion and the diaphragm 6 There is.
[0023]
In this state, when the dynamic exciter is driven, the diaphragm 6 is displaced relative to the
outer yoke 3. Therefore, the gap L shown in FIG. 5 is increased or decreased by the dynamic
amplitude change of the diaphragm 6. .
Therefore, it is necessary to set the gap L within a predetermined range so that the diaphragm 6
and the outer yoke 3 do not contact even when the maximum power supply of the dynamic
exciter is driven. Therefore, in order to secure the predetermined gap L at a position where the
axial pressing force of the first elastic body 7 and the axial pressing force of the second elastic
body 8 are in equilibrium, the first elastic body 7 It is desirable to minimize the difference
between the axial spring constant Kc of the second elastic body 8 and the axial spring constant
Ke of the second elastic body 8 as much as possible.
[0024]
Furthermore, it is desirable that the axial spring constant Kc of the first elastic body 7 and the
radial spring constant Kv orthogonal to this be in a relationship of Kc << Kv, and the difference is
within the range that does not disturb the vibration of the diaphragm 6. Set as large as possible.
The weight of the magnetic circuit portion that occupies most of the weight ratio of the
electrodynamic exciter when the electrodynamic exciter is installed in an inclined or horizontal
state with respect to the gravity axis, that is, the inner yoke 1, the magnet Since the total weight
of 2 and the outer yoke 3 acts in the direction of gravity, if the radial spring constant of the first
elastic body 7 is too low, the axis of the magnetic circuit portion is inclined with respect to the
axis of the diaphragm 6, and the magnetic circuit Air gap will change. As a result, there is an
adverse effect on the electrical characteristics leading to a reduction in the driving force of the
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8
electrodynamic exciter. Furthermore, when the electrodynamic exciter is used as an approach
notification device for an electric car, for example, traveling vibration of the vehicle, in particular,
low frequency vibration is applied, so the bobbin 4 and the coil 5 are the outer yoke 3 and the
inner yoke 1. In an environment where the vibration is severe, it may cause a fatal failure due to
the disconnection of the coil 5 or the like. Therefore, in order to prevent such a problem, the
relationship of Kc << Kv is required.
[0025]
In addition, when the electrodynamic exciter is used outdoors such as a sound generator for an
approach notification device such as an electric car, for example, a waterproof function is also
required because it is exposed to the outside air. Therefore, at least one of the first elastic body 7
and the second elastic body 8 is in the form of a ring, and it is necessary to have a function to
block the internal space of the electrodynamic exciter from the outside. In the first embodiment,
the first elastic body 7 and the second elastic body 8 use rubber ring elastic bodies, and for
example, one axial end face of the first elastic body 7 is the outer yoke 3. The other end face of
the stepped portion 31 is in pressure contact with the end face in the axial direction, and the
other end face is in pressure contact with the diaphragm 6. Further, both axial ends of the second
elastic body 8 are the stepped portion 31 of the outer yoke and the diaphragm 6 The ends are
held in contact with each other.
[0026]
As a result, the internal space of the electrodynamic exciter is completely sealed by the pressure
contact of the axial direction both ends of the first elastic body 7 and the second elastic body 8
and is shut off from the atmosphere. There is no risk of water entering the inside even with the
electrodynamic exciter used. Therefore, insulation failure of the coil 5 and corrosion of the inner
yoke 1 and the outer yoke 3 are hardly generated. Therefore, environmental reliability required
as a sound generator for an approach notification device mounted in a severe environment such
as the vehicle exterior or under the floor can be significantly improved.
[0027]
Second Embodiment FIG. 6 is a partial cross-sectional view showing the configuration of the main
part of an electrodynamic exciter according to a second embodiment of the present invention,
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which corresponds to FIG. 3 of the first embodiment. 6, the same reference numerals as in FIG. 3
indicate the same or corresponding parts. The difference between the second embodiment and
the first embodiment is the cross-sectional shape of the first elastic body 7, and the cross-section
is rectangular. The longitudinal direction of the cross section of the first elastic body 7 is
disposed so as to be sandwiched between the stepped portion 31 of the outer yoke 3 and the
diaphragm 6, and corresponds to a spring shown by a spring constant Kc in FIG. It plays the role
of a spring. Further, a frame portion 62 is formed by bending the outer peripheral end portion of
the diaphragm 6 into a frame shape so as to surround the outer peripheral surface of the outer
yoke 3. The crosswise direction of the cross section of the first elastic body 7 is disposed so as to
be sandwiched between the surface of the frame 62 facing the outer peripheral surface of the
outer yoke 3 and the outer peripheral surface of the outer yoke 3. It plays a role of a spring
corresponding to a spring indicated by a spring constant Kv of 3. Thus, the spring constant for
axially supporting the magnetic circuit portion of the electrodynamic exciter is determined by the
spring constant of the longitudinal section of the first elastic body 7, while the direction
orthogonal to the axial direction of the electrodynamic exciter That is, the spring constant
supported in the radial direction is determined by the spring constant of the first elastic body 7
in the crosswise direction of the cross section.
[0028]
Therefore, by setting the spring constant in the longitudinal direction of the cross section of the
first elastic body 7 to be lower, it is possible to improve the vibration characteristics in the low
frequency region of the dynamic exciter. In addition, when the dynamic exciter axis is inclined
from the gravity axis or when the dynamic exciter is attached to the vertical wall surface, the
spring constant of the first elastic body 7 in the crosswise direction is higher. By setting, it is
possible to elastically support the magnetic circuit portion configured of the inner yoke 1, the
magnet 2 and the outer yoke 3 with a high spring constant. Therefore, it is possible to prevent
the axis of the magnetic circuit, which occupies most of the entire weight, from being inclined
with respect to the axis of the electrodynamic exciter, and to prevent the occurrence of
disconnection or the like due to the contact between the coil 5 and the outer yoke 3. Can.
Therefore, the reliability of the electrodynamic exciter when mounted on a vertical wall can be
significantly improved.
[0029]
Third Embodiment FIG. 7 is a partial cross-sectional view showing a configuration of an
electrodynamic exciter according to a third embodiment of the present invention, which
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corresponds to FIG. 3 of the first embodiment. In FIG. 7, the same reference numerals as in FIGS.
3 and 6 indicate the same or corresponding parts. The third embodiment is different from the
first embodiment and the second embodiment in that the first elastic body 7 is divided into two
elastic bodies, and the first elastic body A 72 in FIG. The elastic body B73 is provided.
[0030]
Here, the first elastic body A72 elastically supports the magnetic circuit portion in the axial
direction, and the first elastic body B73 elastically supports the magnetic circuit portion in the
radial direction. That is, the first elastic body A72 is disposed so as to be sandwiched between the
diaphragm 6 and the stepped portion 31 of the outer yoke 3, and the outer peripheral surface of
the outer yoke 3 and the end of the diaphragm 6 are bent. A gap is provided in the radial
direction so that a spring force does not act between the parts. Further, a frame portion 62 is
formed by bending the outer peripheral end portion of the diaphragm 6 so as to surround the
periphery of the protrusion 32 of the stepped portion 31 of the outer yoke. The first elastic body
B 73 is sandwiched between the surface of the frame 62 facing the periphery of the protrusion of
the stepped portion of the outer yoke 3 and the outer peripheral surface of the protrusion 32 of
the stepped portion 31 of the outer yoke 3. It has a role of a spring corresponding to a spring
shown by a spring constant Kv of FIG. Further, the first elastic body B73 is disposed with a gap in
the axial direction so that the spring force does not act on the diaphragm 6 and the stepped
portion 31 of the outer yoke 3 in the axial direction.
[0031]
It is desirable to set the spring constant lower than the axial spring constant by the first elastic
body A72, and the radial spring constant higher by the first elastic body B73. By setting in this
manner, the reliability of the electrodynamic exciter at the time of vertical wall mounting can be
significantly improved as described in the first embodiment and the second embodiment.
[0032]
Fourth Embodiment FIG. 8 is a partial cross-sectional view showing the configuration of the main
part of an electrodynamic exciter according to a fourth embodiment of the present invention,
which corresponds to FIG. 3 of the first embodiment. In FIG. 8, the same reference numerals as in
FIGS. 3 and 6 denote the same or corresponding parts. The end surface edge portion of the
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11
second elastic body 8 having a substantially U-shaped cross section is carved on the outer
peripheral surface of the outer yoke 3 in the fourth embodiment, which differs from the second
embodiment shown in FIG. It is a point fitted into the groove 32.
[0033]
Also in the fourth embodiment, as in the second embodiment, by setting the spring constant in
the cross-sectional longitudinal direction of the first elastic body 7 to a lower value, the vibration
characteristics in the low frequency region of the electrodynamic exciter are improved. be able
to. In addition, when the dynamic exciter axis is inclined from the gravity axis or when the
dynamic exciter is attached to the vertical wall surface, the spring constant of the first elastic
body 7 in the crosswise direction is higher. By setting, it is possible to elastically support the
magnetic circuit portion configured of the inner yoke 1, the magnet 2 and the outer yoke 3 with
a high spring constant. Therefore, it is possible to prevent the axis of the magnetic circuit, which
occupies most of the entire weight, from being inclined with respect to the axis of the
electrodynamic exciter, and to prevent the occurrence of disconnection or the like due to the
contact between the coil 5 and the outer yoke 3. Can. Therefore, the reliability of the
electrodynamic exciter when mounted on a vertical wall can be significantly improved.
[0034]
Embodiment 5 FIG. 9 is a partial cross-sectional view showing the configuration of the main part
of an electrodynamic exciter according to a fifth embodiment of the present invention, which
corresponds to FIG. 3 of the first embodiment. In FIG. 9, the same reference numerals as in FIGS.
3, 6 and 8 denote the same or corresponding parts. The difference of the fifth embodiment from
the second embodiment shown in FIG. 6 and the fourth embodiment shown in FIG. 8 is in the end
face edge of the second elastic body 8 having a substantially U-shaped cross section. And an end
face in the head axial direction of the outer yoke.
[0035]
Also in the fifth embodiment, as in the second embodiment and the fourth embodiment, by
setting the spring constant in the longitudinal direction of the cross section of the first elastic
body 7 to a lower value, the electrodynamic exciter in the low frequency region is obtained.
Vibration characteristics can be improved. In addition, when the dynamic exciter axis is inclined
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from the gravity axis or when the dynamic exciter is attached to the vertical wall surface, the
spring constant of the first elastic body 7 in the crosswise direction is higher. By setting, it is
possible to elastically support the magnetic circuit portion configured of the inner yoke 1, the
magnet 2 and the outer yoke 3 with a high spring constant. Therefore, it is possible to prevent
the axis of the magnetic circuit, which occupies most of the entire weight, from being inclined
with respect to the axis of the electrodynamic exciter, and to prevent the occurrence of
disconnection or the like due to the contact between the coil 5 and the outer yoke 3. Can.
Therefore, the reliability of the electrodynamic exciter when mounted on a vertical wall can be
significantly improved.
[0036]
Sixth Embodiment FIG. 10 is a perspective view showing the overall appearance of an
electrodynamic exciter according to a sixth embodiment of the present invention, which
corresponds to FIG. 4 of the first embodiment. In FIG. 10, the same reference numerals as in
FIGS. 1 and 4 denote the same or corresponding parts. In the first to fifth embodiments, the
second elastic body 8 is formed in a ring shape so as to cover the outer periphery of the outer
yoke 3 and the diaphragm 6. On the other hand, in the sixth embodiment, the second elastic body
81 is not ring-shaped, and is divided and fixed in at least three places on the outer peripheral
surface of the dynamic exciter. In the figure, 62 is an outer peripheral wall surface of the
diaphragm 6, and 81 is a second elastic body which elastically supports the outer yoke 3 and the
diaphragm 6 partially. The second elastic body 81 has a U-shaped cross-sectional shape, and is
mounted so as to sandwich the outer yoke 3 and the diaphragm 6, and for example, a nondetachment preventing means such as bonding is applied.
[0037]
The cross-sectional configuration including the second elastic body 81 of the electrodynamic
exciter of the external configuration of FIG. 10 is the same configuration as the cross-sectional
configuration shown in FIG. 9 of the fifth embodiment. However, the structure in which the
second elastic body 81 fixes the outer yoke 3 and the diaphragm 6 is not limited to the one
shown in FIG. 10, and as shown in the first to third embodiments, the outer wall surface of the
outer yoke has a radial direction In the present embodiment, a grooved portion may be provided
on the outer peripheral surface of the outer yoke 3 shown in the fourth embodiment. Also, the
cross-sectional configuration of the first elastic body 7 may be any of the configurations shown
in the first to fourth embodiments.
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13
[0038]
According to the electrodynamic exciter of the sixth embodiment, compared with the ring-shaped
second elastic body 8, the divided second elastic body 81 significantly improves the
assemblability and can reduce the cost. It becomes.
[0039]
Embodiment 7
FIG. 11 is a cross-sectional view showing the configuration of an electrodynamic exciter
according to a seventh embodiment of the present invention, and FIG. 11 (A) is a cross-sectional
view in a plane perpendicular to the axis of the electrodynamic exciter; Is a cross-sectional view
in a plane including the axis. 11 (A) is a cross-sectional view at the position A-A shown in FIG. 11
(B), and FIG. 11 (B) is a cross-sectional view at the position B-B shown in FIG. In FIG. 11, the same
reference numerals as in FIG. 1 indicate the same or corresponding parts. In the first to fifth
embodiments, the first elastic body 7 and the like are formed in a ring shape so as to surround
the outer periphery of the outer yoke 3. On the other hand, in the seventh embodiment, the first
elastic body 75 is not ring-shaped, but divided into a plurality in the circumferential direction.
Although four divided first elastic bodies 75 are provided in FIG. 11, at least three may be
provided.
[0040]
The shape and configuration of the first elastic body 75 in the cross section shown in FIG. 11B
are the same as those of Embodiment 1, but the cross sectional shape and the cross sectional
configuration of the first elastic body 75 are the same as in FIG. It is not restricted to what is
shown to (B). The cross-sectional shape and cross-sectional configuration of the first elastic body
75 may be any of the cross-sectional shapes and cross-sectional configurations shown in the first
to fifth embodiments. Also, the configuration of the second elastic body 8 may be any of the
configurations shown in the first to fifth embodiments. Furthermore, as shown in the sixth
embodiment, the second elastic body may be divided. However, in the case where the first elastic
body and the second elastic body are divided together, outdoor use may be hindered because
there is no waterproof function.
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[0041]
Even with the electrodynamic exciter according to the sixth embodiment, it is possible to prevent
the axis of the magnetic circuit, which occupies most of the entire weight, from tilting relative to
the axis of the electrodynamic exciter, and the coil 5 and the outer yoke 3 It is possible to
prevent the occurrence of a disconnection problem or the like due to contact or the like.
Therefore, the reliability of the electrodynamic exciter at the time of vertical wall mounting can
be greatly improved, and the cost can also be reduced.
[0042]
1: inner yoke 2: magnet 3: outer yoke 5: coil 6: diaphragm 7, 72, 73, 75: first elastic body 8, 81:
second elastic body 61, 62: frame portion of diaphragm
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