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DESCRIPTION JPH11262089

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DESCRIPTION JPH11262089
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker device used to convert an electrical signal to sound.
[0002]
2. Description of the Related Art As a speaker device, a speaker device is known which is
provided with a magnetic circuit which is disposed facing each other with a magnetic pole
direction in which a pair of magnets repel each other with a center plate interposed
therebetween to form a repulsive magnetic field. There is.
[0003]
A speaker device of this type is disclosed, for example, in Japanese Patent Laid-Open No. 623383.
As shown in FIG. 8, the speaker device 101 includes a vibration system 105 for generating
sound, a magnetic circuit 106 for driving the vibration system 105, and a frame 107 for
supporting the vibration system 105 and the magnetic circuit 106. There is.
[0004]
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As shown in FIG. 8, the vibration system 105 has a substantially conical main diaphragm 110
having a through hole at the center, and a substantially conical sub diaphragm 111 provided in
the through hole on the main diaphragm 110. , A dome-shaped cap 112 provided to close the
through hole of the main diaphragm 110, a cylindrical bobbin 113 provided in the through hole
of the main diaphragm 110, and an outer peripheral portion of the main diaphragm 110. A
flexible edge 114 connected in series and a flexible and vibration absorbing damper 115
provided on the bobbin 113 are included.
[0005]
As shown in FIG. 8, the magnetic circuit 106 includes a voice coil 119 for vibrating the vibration
system 105, a center plate 120 for forming a magnetic path, and a pair of magnets 121 and 122
for applying a magnetic flux to the center plate 120. have.
[0006]
The voice coil 119 is provided so as to be wound around the outer periphery of the bobbin 113
of the vibration system 105, and is arranged at the outer periphery of the center plate 120 and
the magnets 121 and 122.
Both end portions of the voice coil 119 are connected to connection portions (not shown)
provided on the outer peripheral portion of the frame 107 via tinsel wires.
The center plate 120 is formed in a disk shape by a magnetic material.
[0007]
The magnets 121 and 122 are formed in a disk shape, and are disposed so as to coincide with
the center of the center plate 120 and to make the magnetic pole directions sandwiching and
repel the center plate 120 to face each other.
[0008]
In the frame 107, as shown in FIG. 8, a holding portion 108 for holding the main diaphragm 110
is formed at the opening end, and the outer peripheral portion of the edge 114 of the main
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diaphragm 110 is shown in the holding portion 108. Not fixed through an annular gasket.
Further, the frame 107 is provided with a support projection for supporting the magnetic circuit
106 at the center of the bottom surface.
[0009]
In the speaker device 101 described above, when current is supplied to the voice coil 119, the
voice coil 119 vibrates according to Fleming's left rule, and the main diaphragm 110 and the sub
diaphragm 111 are vibrated with the vibration of the voice coil 119. Vibrate to generate sound.
[0010]
Further, as a speaker device, there is a speaker device disclosed in Japanese Patent Laid-Open
No. 6-233384.
As shown in FIG. 9, the speaker device 102 includes a vibration system 125 for generating
sound, a magnetic circuit 126 for driving the vibration system 125, and a set of frames 127 for
supporting the vibration system 125 and the magnetic circuit 126. , 128 and the like.
[0011]
The vibration system 125 is, as shown in FIG. 9, a substantially flat plate-like diaphragm 130
having a through hole at the center, a cylindrical bobbin 131 provided in the through hole of the
diaphragm 130, and the bobbin 131. A dome-shaped cap 132 provided so as to close one open
end, an elastic supporting member 133 continuously provided on the outer peripheral portion of
the diaphragm 130, and flexibility and vibration absorbing property attached to the bobbin 131
And dampers 134 and 135, respectively.
[0012]
As shown in FIG. 9, the magnetic circuit 126 includes a voice coil 139 for vibrating the vibration
system 125, a center plate 140 for forming a magnetic path, and a pair of magnets 141 and 142
for applying a magnetic flux to the center plate 140. have.
[0013]
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The voice coil 139 is wound around the outer periphery of the bobbin 131 of the vibration
system 125 and provided around the center plate 140 and the outer periphery of the magnets
141 and 142.
Both end portions of the voice coil 139 are connected to connection portions (not shown)
provided on the outer peripheral portion of the frame 127 via tinsel wires.
The center plate 140 is formed in a disk shape by a magnetic material.
[0014]
The magnets 141 and 142 are formed in a disk shape, and are disposed so as to coincide with
the center of the center plate 140 and to make the magnetic pole directions sandwiching and
repel the center plate 140 opposite to each other.
[0015]
As shown in FIG. 9, the frames 127 and 128 are combined with each other to support the
diaphragm 130 and the magnetic circuit 126 inside.
In the frames 127 and 128, holding portions 129 for holding the diaphragm 130 are
respectively formed, and the outer peripheral portion of the diaphragm 130 is supported by the
holding portions 129 via the elastic support member 133. Further, the frame 128 is formed with
a support projection for supporting the magnetic circuit 126 at the center of the bottom surface.
[0016]
In the speaker device 102 described above, when current is supplied to the voice coil 139, the
voice coil 139 vibrates according to Fleming's left rule, and the diaphragm 130 vibrates with the
vibration of the voice coil 139 to generate sound. Occur.
[0017]
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Furthermore, as a speaker apparatus, there is a speaker apparatus disclosed in Japanese Patent
Application Laid-Open No. 6-284499.
As shown in FIG. 10, the speaker device 103 includes a vibration system 145 for generating
sound, a magnetic circuit 146 for driving the vibration system 145, and a set of frames 147 for
supporting the vibration system 145 and the magnetic circuit 146. , 148 and the like.
[0018]
As shown in FIG. 10, the vibration system 145 includes a pair of substantially flat plate-like
diaphragms 150 and 151 having a through hole at the central portion, and elastic supporting
members attached to the outer peripheral portions of the diaphragms 150 and 151. And 153.
The diaphragms 150 and 151 are bonded by providing an air gap between the opposing
surfaces. One end of the elastic support member 153 supports the diaphragms 150 and 151, and
the other end is attached to the frames 147 and 148.
[0019]
As shown in FIG. 10, the magnetic circuit 146 includes a voice coil 159 for vibrating the
vibration system 145, a center plate 160 for forming a magnetic path, and a pair of magnets 161
and 162 for applying a magnetic flux to the center plate 160. have.
[0020]
The voice coil 159 is provided in a state of being wound around the inner peripheral portions of
the diaphragms 150 and 151 of the vibration system 145, and is arranged on the outer
peripheral portions of the center plate 160 and the magnets 161 and 162.
Both ends of the voice coil 159 are connected to connection portions (not shown) provided on
the outer peripheral portions of the frames 147 and 148 via tinsel wires. The center plate 160 is
formed of a magnetic material in a disc shape. The magnets 161 and 162 are formed in a disk
shape, and are disposed so as to coincide with the center of the center plate 160 and to make the
magnetic pole directions sandwiching and repel the center plate 160 to face each other.
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[0021]
The frames 147 and 148 are formed in the same shape, and are combined with each other to
support the vibration system 145 and the magnetic circuit 146 inside. A holding portion 149 for
holding the diaphragms 150 and 151 is formed on the frames 147 and 148, and the outer
peripheral portion of the diaphragms 150 and 151 is fixed to the holding portion 149 via the
elastic support member 153. Further, support projections for supporting the magnetic circuit
126 are formed on the center portions of the bottom portions of the frames 147 and 148,
respectively.
[0022]
In the speaker device 103 described above, when current is supplied to the voice coil 159, the
voice coil 159 vibrates according to Fleming's left rule, and the diaphragms 150 and 151 vibrate
according to the vibration of the voice coil 159. Generate sound.
[0023]
And it is known that the magnetic circuits 106, 126 and 146 provided in the above-mentioned
speaker devices 101, 102 and 103 are effective in thinning the entire device.
[0024]
By the way, as shown in FIG. 8, although the above-described speaker device 101 is made thinner
by the magnetic circuit 106, the bobbin 113 is supported by the damper 115, and Since the
auxiliary diaphragm 111 is provided at 113, there is a problem that the thickness in the
amplitude direction of the vibration system 105 is large.
[0025]
Further, as shown in FIG. 9, the above-described speaker device 102 is thinned by the magnetic
circuit 126, but the dampers 134 and 135 and the diaphragm 130 are overlapped in the
amplitude direction of the vibration system 125. There is a problem that the thickness in the
amplitude direction is large because of the presence.
[0026]
Further, as shown in FIG. 10, although the above-described speaker device 103 is thinned by the
magnetic circuit 146, it does not include a damper or the like for holding the voice coil 159 at a
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predetermined position in the magnetic field. Since the rolling operation is likely to occur at the
time of the large amplitude of the plate 150, reproduction of high sound quality is difficult.
[0027]
Further, the speaker device 103 has a problem that the voice coil 159 is easily broken by the
rolling operation of the diaphragm 150, and the input resistance is poor.
[0028]
In addition, since the air in the enclosure leaks from the gap between the voice coil 159 and the
center plate 160, the speaker device 103 has a problem that distortion is easily generated in the
reproduced sound.
[0029]
Next, the magnetic flux distribution of the magnetic circuits 106, 126 and 146 of the
conventional speaker devices 101, 102 and 103 will be described with reference to the drawings.
In FIG. 11, the vertical axis indicates the position in the thickness direction of the magnetic
circuit parallel to the amplitude direction of the vibration system, and the horizontal axis
indicates the direction of the magnetic flux.
Further, in FIG. 11, the arrow indicates the direction of the magnetic line of force.
[0030]
The magnetic circuits 106, 126 and 146 provided in the conventional speaker devices 101, 102
and 103 have the largest magnetic flux density in the vicinity of the outer peripheral portions of
the center plates 120, 140 and 160, as shown in FIG.
In each of the magnetic circuits 106, 126 and 146, the center in the thickness direction of the
center plates 120, 140 and 160 is the maximum position P3 at which the magnetic flux density
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is maximum.
[0031]
In each of the magnetic circuits 106, 126 and 146, the magnetic flux gradually decreases as the
distance from the outer peripheral portion of the center plate 120, 140 and 160 to the outer
peripheral portion on the magnet 121, 122, 141, 142, 161 and 162 side increases. The magnetic
flux becomes zero at the approximate center in the thickness direction of the outer peripheral
portion of each of the magnets 121, 122, 141, 142, 161, 162.
[0032]
In each of the magnetic circuits 106, 126, and 146, as shown in FIG. 11, the center plates 120,
140, and 160 are approximately at the center of the outer peripheral portion of each of the
magnets 121, 122, 141, 142, 161, and 162 in the thickness direction. The direction of the
magnetic lines of force shown by the arrows in FIG. 11 changes in the opposite direction as it
moves away from the space, and the magnetic flux density in the reverse direction becomes
maximum at the end of each magnet 121, 122, 141, 142, 161, 162. When the distance further
from the plates 120, 140 and 160 in the direction away from the plates 120, 140 and 160, the
magnetic flux becomes zero.
[0033]
The large amplitude type speaker device acts on the voice coil 170 attached to the diaphragm
172 regardless of the position of the voice coil 170 in the amplitude direction, as shown in FIG.
Since it is necessary to form the length in the amplitude direction relatively large so that the
magnetic flux density is constant, it has been difficult to reduce the thickness.
[0034]
Further, in this speaker device, when the magnetic circuit has a magnetic flux distribution as
shown in FIG. 11 described above, magnetic lines of force in the reverse direction interfere with
the movement of the voice coil 170 in the regions on both sides in the thickness direction of the
center plate 171 Since it works as a force, there is a problem that it is not preferable for highquality sound reproduction.
[0035]
Therefore, an object of the present invention is to provide a speaker device capable of achieving
high input resistance while achieving thinning and weight reduction of the entire device.
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[0036]
SUMMARY OF THE INVENTION In order to achieve the above object, the speaker device
according to the present invention has a center plate made of a magnetic material and opposing
magnetic pole directions sandwiching the center plate and facing each other. And a magnetic
circuit having a set of magnets disposed.
The speaker device is provided with a pair of elastic support members, which are respectively
disposed in line symmetry with respect to a center line in the thickness direction of the
diaphragm and support the outer peripheral portion of the diaphragm in a displaceable manner.
[0037]
According to the speaker device configured as described above, the outer peripheral portion of
the diaphragm is supported via a pair of elastic support members provided at predetermined
intervals in the thickness direction of the diaphragm, so that vibration is caused. The rolling
movement of the plate is suppressed.
[0038]
Further, in the magnetic circuit provided in the speaker device according to the present
invention, two places which are axisymmetric to the center line in the thickness direction of the
center plate are formed such that the magnetic flux density is maximized over each of the two
outer circumferences. Ru.
[0039]
In the above-described magnetic circuit, portions where magnetic fluxes are concentrated over
the outer periphery of the center plate are formed on both ends in the thickness direction of the
center plate.
[0040]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The following is a description of a
specific embodiment of the present invention, with reference to the drawings.
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As shown in FIG. 1, the speaker device 1 includes a vibration system 5 for generating sound, a
magnetic circuit 6 for driving the vibration system 5, and a frame 7 for supporting the vibration
system 5 and the magnetic circuit 6. There is.
[0041]
The vibration system 5 is, as shown in FIG. 1, an annular diaphragm 10 having a through hole
10a at its central portion, and a pair of elastic support members 11, 12 for displaceably
supporting the outer peripheral portion of the diaphragm 10. And a bottomed cylindrical cap 13
having an open end attached to the through hole 10 a of the diaphragm 10.
[0042]
The diaphragm 10 is formed to a desired thickness by a relatively lightweight flat plate having an
air gap inside or on a surface of, for example, a honeycomb structure, a foam structure made of
foam mica or the like.
A magnetic circuit 6 is disposed in the through hole 10 a of the diaphragm 10.
[0043]
As shown in FIG. 1, the elastic support members 11 and 12 are formed of a material having
elasticity in a cross-sectional corrugated shape or a roll shape exhibiting concentric circles.
The pair of elastic support members 11 and 12 are provided in line symmetry to and in parallel
with each other with respect to the center line in the thickness direction of the diaphragm 10.
One set of the elastic support members 11 and 12 has one end attached to both sides in the
thickness direction of the outer peripheral portion of the diaphragm 10, and the other end to the
annular edge ring 14 provided on the frame 7. It is attached.
[0044]
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10
The cap 13 is made of, for example, foam mica, and is attached so as to close the through hole 10
a of the diaphragm 10 so as to cover the front side of the magnetic circuit 6.
In order to prevent the cap 13 from colliding with the magnet or the like possessed by the
magnetic circuit 6 when the diaphragm 10 performs the maximum amplitude, the bottom surface
of the cap 13 is a magnet at least the maximum amplitude of the diaphragm 10 It is provided to
be separated from the main surface of
The magnetic circuit 6 is prevented by the cap 13 from leaking air in the enclosure from the gap
between the diaphragm 10 and the magnetic circuit 6.
[0045]
That is, the elastic support members 11 and 12 respectively support the diaphragm 10 with a
predetermined interval in the thickness direction of the diaphragm 10 to support voice coils to
be described later provided in the through holes 10 a of the diaphragm 10 in a magnetic field.
The rolling movement that occurs when the diaphragm 10 vibrates to a large extent can be
suppressed.
Therefore, although the speaker device 1 is configured not to include the dampers 115, 134, and
135 included in the above-described conventional speaker devices 101 and 102, the rolling
operation is unlikely to occur even when the diaphragm 10 has a large amplitude.
[0046]
As shown in FIG. 1, the magnetic circuit 6 is disposed in the through hole 10 a of the diaphragm
10 of the vibration system 5, and has a voice coil 19 that vibrates the diaphragm 10 and a center
plate 20 that forms a magnetic path. And a pair of magnets 21 and 22 for applying a magnetic
flux to the center plate 20.
[0047]
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The voice coil 19 is attached to the inner circumferential surface of the through hole 10 a of the
diaphragm 10 of the vibration system 5 with the center line in the winding width direction
aligned with the center line in the thickness direction of the diaphragm 10.
Further, the winding width of the voice coil 19 is formed equal to or less than the thickness of
the center plate 20.
[0048]
As shown in FIG. 1, the center plate 20 is formed in a disk shape, for example, by a soft magnetic
material such as a hot forged steel plate.
The magnets 21 and 22 use, for example, anisotropic rare earth sintered magnets such as
neodymium magnets, and are formed in a disk shape whose outer diameter is slightly smaller
than the outer diameter of the center plate 20.
[0049]
As shown in FIG. 1 and FIG. 2, the magnets 21 and 22 are disposed on both sides of the center
plate 26 with the directions of magnetic poles sandwiching and repelling the center plate 26
between each other. The outer periphery of the plate 26 is protruded.
That is, for example, the center plate 20 side of each of the magnets 21 and 22 is magnetized in
the N pole, and the other side is magnetized in the S pole.
[0050]
The magnetic flux distribution of the magnetic circuit 6 configured as described above will be
described with reference to the drawings.
In FIG. 2, the vertical axis indicates the position in the thickness direction of the magnetic circuit
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6 parallel to the amplitude direction of the vibration system 5, and the horizontal axis indicates
the direction of the magnetic flux.
Moreover, in FIG. 2, the arrow shows the direction of a magnetic force line.
[0051]
In the magnetic circuit 6, as shown in FIG. 2, the magnetic flux density is maximized in the
magnetic field across the outer circumferences of two ends which are axisymmetric with respect
to the center line of the center plate 20 in the thickness direction. The tops P1 and P2 are
formed.
The magnetic circuit 6 is formed by respectively setting the thicknesses of the center plate 20
and the magnets 21 and 22 so that the two tops P1 and P2 where the magnetic flux density is
maximum are located at both ends of the center plate 20. Be done.
[0052]
As shown in the magnetic flux distribution in FIG. 2, in the magnetic circuit 6, the magnetic flux
density at the center in the thickness direction of the center plate 20 is small, and the magnetic
flux density gradually increases toward both ends in the thickness direction of the center plate
20. It is assumed. また。 In the magnetic circuit 6, the magnetic flux density is gradually reduced
from both ends in the thickness direction of the center plate 20 toward the magnets 21 and 22,
and the direction of the magnetic flux is reversed from the center in the thickness direction of the
magnets 21 and 22. Even smaller. Then, in the magnetic circuit 6, the magnetic flux density
increases in the direction away from the end portions in the thickness direction of the magnets
21 and 22.
[0053]
Regarding the magnetic circuit 6 of the speaker device 1 configured as described above, the state
of the voice coil 19 that oscillates in the magnetic field will be described with reference to the
drawings. In FIG. 3, the vertical axis indicates the position in the thickness direction of the
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magnetic circuit 6 parallel to the amplitude direction of the vibration system 5, and the
horizontal axis indicates the direction of the magnetic flux.
[0054]
In the magnetic circuit 6, as shown in FIG. 3, when the voice coil 19 is located at the center of the
center plate 20 in the thickness direction, the magnetic flux in the region between the tops P1
and P2 acts on the voice coil 19. In the magnetic circuit 6, when the voice coil 19 is located at
each end of the center plate 20 in the thickness direction, the magnetic flux of the area of the top
P1 or the top P2 acts on the voice coil 19. In the magnetic circuit 6, the effective total magnetic
flux acting on the voice coil 19 is always constant regardless of which position in the amplitude
range the voice coil 19 at the time of amplitude is located.
[0055]
Then, in the speaker device 1, when the current is supplied to the voice coil 19, the voice coil 19
vibrates according to the law of Fleming's left hand, and the diaphragm 10 vibrates with the
vibration of the voice coil 19 to generate sound. Occur.
[0056]
The center plate is formed on both ends in the thickness direction by being formed in a shape in
which the outer diameters on both sides in line symmetry with the center line in the thickness
direction are larger than the outer diameter at the central portion in the thickness direction. The
magnetic flux may be formed to be concentrated.
[0057]
That is, the magnetic circuit 6 may be configured to include a center plate 24 as shown in FIG. 4,
for example.
As shown in FIG. 4, in the center plate 24, an annular magnetic flux adjusting groove 25 is
formed in the substantially central portion in the thickness direction and along the outer
peripheral portion.
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That is, the center plate 24 is formed by the magnetic flux adjusting groove 25 so as to weaken
the magnetic flux at the central portion in the thickness direction.
[0058]
Alternatively, the magnetic circuit 6 may be configured to include a center plate 26 as shown in
FIG. In the center plate 26, as shown in FIG. 5, the cross-sectional circle in which the outer
diameter of the central portion in the thickness direction is minimized and the outer diameter
gradually increases toward both ends in the thickness direction An arc-shaped magnetic flux
adjustment recess 27 is formed.
[0059]
Alternatively, the magnetic circuit 6 may be configured to include a center plate 28 as shown in
FIG. As shown in FIG. 6, in the center plate 28, substantially V-shaped magnetic flux adjusting
grooves 29 are formed in the substantially central portion in the thickness direction and along
the outer peripheral portion.
[0060]
As shown in FIG. 1, the frame 7 is formed of a metal material in a cylindrical shape with a
bottom, and a support protrusion 30 for supporting the magnetic circuit 6 is formed at the
center of the bottom portion. Further, at the outer peripheral portion of the frame 7, a support
portion for supporting the vibration system 5 is formed. Further, although not shown, at the
outer peripheral portion of the frame 7, connection terminals are provided in which both ends of
the voice coil 19 are connected via a tinsel wire.
[0061]
As described above, the speaker device 1 can achieve reduction in thickness and weight of the
entire device by supporting the diaphragm 10 vibrated by the magnetic circuit 6 by the pair of
elastic support members 11 and 12 .
[0062]
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In addition, the speaker device 1 includes a pair of elastic support members 11 and 12 which are
supported at predetermined intervals in the thickness direction of the diaphragm 10, thereby
generating mechanical distortion caused by amplitude non-linearity. Since it is possible to
suppress the rolling operation of the vibration system 5, it is possible to perform high-amplitude
vibration of high sound quality with little distortion, and high input resistance can be realized.
[0063]
Further, according to the speaker device 1, as a mechanical support system for supporting the
vibration system 5, the elastic support members 11 and 12 arranged in line symmetry with
respect to the center line in the thickness direction of the diaphragm 10 are provided. By
providing such a signal, good amplitude linearity can be obtained, and distortion of the
reproduced sound can be reduced.
[0064]
Further, according to the speaker device 1, two places where the magnetic flux density is
maximum are respectively formed at both ends symmetrical to each other in the thickness
direction of the center plate 20 of the magnetic circuit 5. Since the occurrence is suppressed,
distortion of the reproduced sound can be reduced.
[0065]
Further, according to the speaker device 1, since the voice coil 19 is directly attached to the
through hole 10 a of the diaphragm 10, sound pressure reproduction faithful to the input signal
is possible.
[0066]
Further, according to the speaker device 1, the winding width of the voice coil 19 can be set to
the center plate by providing the magnetic circuit in which the tops P1 and P2 whose magnetic
flux density is maximum are formed in line symmetry to the center line of the center plate 20
respectively. The effective total magnetic flux at the time of amplitude can be made constant
even if the thickness is less than the thickness of the above, so that high-quality, high-amplitude
vibration is possible despite the voice coil 19 having a relatively small winding width. Can be
further reduced in thickness and weight.
[0067]
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In the speaker device 1 described above, the vibration system 5 is configured to include the cap
13. However, the vibration device 5 is provided across the through holes 10a of the diaphragm
10 and the magnets 21 and 22 of the magnetic circuit 6 Another loudspeaker device with a
displaceably supporting cap will be described with reference to the drawings.
The other speaker devices have substantially the same configuration as the above-described
speaker device 1, and therefore, the same members are denoted by the same reference numerals
and the description thereof will be omitted.
[0068]
As shown in FIG. 7, the speaker device 2 is provided with a cap 36 provided across the through
hole 10 a of the diaphragm 10 and the magnets 21 and 22 of the magnetic circuit 6 to support
the diaphragm 10 displaceably. It has 35.
[0069]
As shown in FIG. 7, the cap 36 is formed in a substantially annular shape of an elastic material,
and the outer peripheral portion is fixed and attached on the main surface around the through
hole 10 a of the diaphragm 10 and the inner peripheral portion Is fixed to the outer periphery of
the magnet 21 on the front side of the magnetic circuit 6 and attached.
That is, the cap 36 supports the diaphragm 10 in a displaceable manner, and ensures that the air
in the enclosure leaks from the gap between the through hole 10 a of the diaphragm 10 and the
outer periphery of the magnetic circuit 6. To prevent.
[0070]
As described above, according to the speaker device of the present invention, the diaphragm is
supported via a pair of elastic supporting members provided in line symmetry with respect to the
center line in the thickness direction of the diaphragm. As a result, it is possible to reduce the
thickness and weight of the entire device.
Further, according to this speaker device, high amplitude vibration with high distortion and less
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high sound quality can be realized, so that high input resistance can be realized.
[0071]
Further, according to the speaker device according to the present invention, the voice coil has a
relatively small winding width by providing the magnetic circuit in which two places where the
magnetic flux density is maximum are formed in line symmetry on the center line of the center
plate. Even if there is a constant magnetic flux at the time of amplitude, high-quality, highamplitude vibration is possible even if a voice coil with a relatively small winding width is
adopted, and the entire device is further thinned and lightened. Can be implemented.
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