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JPH10322793

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JPH10322793
[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 A conventional speaker device will be described with reference
to the drawings. As shown in FIG. 3, the speaker device 51 includes a vibration system 54 for
generating sound, a magnetic circuit 55 for driving the vibration system 54, and a frame 56 for
supporting the vibration system 54.
[0003]
The vibration system 54, as shown in FIG. 3, has a substantially conical diaphragm 61 having a
through hole 61a at the center, and a dome-shaped cap provided on the diaphragm 61 so as to
close the through hole 61a. 62, a cylindrical bobbin 63 having one end provided in the through
hole 61a of the diaphragm 61, a flexible edge 64 continuously connected to the outer periphery
of the diaphragm 61, and a central portion of the diaphragm 61 And a damper 65 having
flexibility and vibration absorption.
[0004]
As shown in FIG. 3, the magnetic circuit 55 includes a voice coil 66 for vibrating the vibration
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system 54, a yoke 67 for forming a closed magnetic path, a drive magnet 68 for applying a
magnetic flux to the yoke 67, and the drive magnet. A top plate 71 is provided adjacent to 68 to
form a magnetic gap G0.
[0005]
The voice coil 66 is provided on the outer peripheral portion of the bobbin 63 of the vibration
system 54, and is disposed in the magnetic gap portion G0.
Both ends of the voice coil 66 are connected to connection portions 75 provided on the outer
peripheral portion of the frame 56 via the tinsel wires 74.
[0006]
The yoke 67 is formed of a magnetic material in a disk shape, and a cylindrical center pole 70 is
provided in a protruding manner at a central portion.
The center pole 70 is inserted into the inner peripheral portion of the bobbin 63 of the vibration
system 54.
[0007]
The driving magnet 68 is formed in an annular shape having a central hole 68 a, and the center
pole 70 is inserted into the central hole 68 a and provided on the yoke 67. As shown in FIG. 1, in
the drive magnet 68, the yoke 67 side is magnetized to the S pole, and the top plate 71 side is
magnetized to the N pole. Further, the yoke 67 is magnetized such that the position adjacent to
the S pole side of the drive magnet 68 is S pole.
[0008]
The top plate 71 is formed in an annular shape having a central hole 71 a of a magnetic material,
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and the center pole 70 is inserted into the central hole 71 a and provided on the drive magnet
68. The top plate 71 has a magnetic gap portion G0 formed between the inner peripheral portion
and the outer peripheral portion of the center pole 70, and is magnetized to an N pole.
[0009]
The frame 56 is formed of a metal material in a substantially cylindrical shape whose diameter is
increased from the rear end side toward the front end side. A holding portion 77 for holding the
vibration system 54 is formed on the front end side of the frame 56, and an outer peripheral
portion of the edge 64 of the vibration system 54 is fixed to the holding portion 77 via an
annular gasket 78. ing. Further, the frame 56 is provided with a connection portion 75 connected
to the voice coil 66 at the outer peripheral portion.
[0010]
In the speaker device 51 described above, when current is supplied to the voice coil 66, the voice
coil 66 vibrates according to Fleming's left rule, and the diaphragm 61 vibrates with the vibration
of the voice coil 66 to generate sound. Occur.
[0011]
Further, as shown in FIG. 4, the speaker device 52 is a magnetic shield type, and the same
members as those of the above-described speaker device 51 are assigned the same reference
numerals and explanation thereof is omitted.
[0012]
The magnetic circuit 85 of the speaker device 52 is provided with a cancel magnet 87 that
prevents the magnetic flux of the drive magnet 68 from leaking to the outside of the magnetic
circuit 55.
The cancel magnet 87 is formed in an annular shape having a central hole 87 a and is provided
at the rear end of the yoke 67.
As shown in FIG. 4, in the cancel magnet 87, the yoke 67 side is magnetized to the S pole, and the
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rear end side is magnetized to the N pole.
[0013]
Further, in the speaker device 52, a shield cover 88 is provided to cover the magnetic circuit 85
in order to further prevent the magnetic flux from leaking from the magnetic circuit 85 to the
outside. The shield cover 88 is formed of a magnetic material and has a substantially cylindrical
shape with a bottom, and surrounds the yoke 67, the drive magnet 68, and the cancel magnet 87.
[0014]
Therefore, in the speaker device 52, the leakage flux leaking to the outside is reduced, and the
leakage flux leaking to the outside of the speaker box is reduced even when mounted in a small
speaker box not shown.
[0015]
Further, in the speaker device 52, the magnetic flux density of the magnetic gap portion G0 by
the magnetic circuit 85 is increased by about 10% due to the provision of the cancel magnet 87,
but the reproduction characteristic of the bass band is insufficient.
[0016]
Generally, in the bass reflex system, it is known that the reproduction band of the lowest bass is
expanded when the resonance sharpness Q when the speaker box to be used is sealed is 0.58.
[0017]
Therefore, in the above-described small and inexpensive speaker device 52, in order to reduce
the resonance sharpness Q of the lowest resonance frequency, the magnetic flux density of the
magnetic gap portion G0 of the magnetic circuit 85 is increased, and the voice coil 66 is effective.
It is necessary to increase the length, and also to reduce the lowest resonance frequency.
[0018]
By the way, since the diameter of the voice coil 66 is small, it is difficult to increase the effective
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length of the voice coil 66 in the above-described small and inexpensive speaker device 52.
Therefore, in the speaker device 52, it is difficult to reduce the resonance sharpness Q at the
lowest resonance frequency, and it is difficult to expand the reproduced sound of the bass and
the reproduction band to the lower side.
[0019]
The voice coil 66 is advantageous in reproducing the bass band because the weight is increased
by increasing the effective length, but reproduction of the treble band becomes difficult, and the
output sound pressure level of the speaker device 52 There was a problem that it decreased.
[0020]
Further, in order to increase the magnetic flux density of the magnetic gap portion G0, it is
necessary to increase the size of the drive magnet 68, and there is a problem that the magnetic
circuit 85 becomes large and expensive.
[0021]
Further, in order to increase the magnetic flux density of the magnetic gap portion G0, the
magnetic flux density can be increased by reducing the gap, but the voice coil 66 becomes
smaller as the gap is reduced.
Therefore, in the magnetic circuit 85, the weight of the voice coil 66 and the bobbin 63 is
lightened, and the minimum resonance frequency is increased, which makes it difficult to
reproduce the bass band.
[0022]
That is, in the small and inexpensive speaker device 52, it is very difficult to reduce the
resonance sharpness Q at the lowest resonance frequency.
[0023]
Therefore, the present invention is compact and inexpensive, which makes it possible to reduce
the resonance sharpness Q of the lowest resonance frequency and improve the reproduction
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characteristics of the bass band by effectively utilizing the magnetic fluxes of the driving magnet
and the magnetic shielding magnet. To provide a speaker device.
[0024]
SUMMARY OF THE INVENTION In order to achieve the above object, the speaker device
according to the present invention comprises an annular drive magnet coaxially arranged with
respect to a center pole of the yoke and a center pole for the center pole. And an annular
magnetic demagnetizing magnet coaxially disposed and having a magnetic pole direction
opposite to the magnetic pole direction of the driving magnet.
The speaker device is annularly formed of a magnetic material, located on the tip end side of the
center pole and coaxially arranged with respect to the center pole to form a first magnetic gap
portion with the center pole. And a second magnetic gap formed between the first pole and the
center pole which is annularly formed of a magnetic material and located on the proximal end
side of the center pole of the yoke and coaxially arranged with respect to the center pole And a
voice coil disposed in the second magnetic gap portion.
[0025]
In the speaker device configured as described above, the magnetic flux density by the driving
magnet and the magnetic flux by the magnetic shielding magnet respectively pass through the
second magnetic gap portion, so the magnetic flux density of the second magnetic gap portion
acting on the voice coil is Be enlarged.
That is, in this speaker device, the magnetic flux from the drive magnet and the magnetic shield
magnet is sufficiently and effectively used.
Therefore, according to this speaker device, the magnetic flux density acting on the voice coil is
increased without increasing the size of the magnetic circuit.
[0026]
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DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The following is a description of a
specific embodiment of the present invention, with reference to the drawings.
As shown in FIG. 1, the speaker device 1 according to the embodiment generally includes a
vibration system 4 for generating sound, a magnetic circuit 5 for driving the vibration system 4,
and a frame 6 for supporting the vibration system 4. ing.
[0027]
As shown in FIG. 1, the vibration system 4 has a substantially conical diaphragm 11 having a
through hole 11a at the center, and a dome-shaped cap provided on the diaphragm 11 so as to
close the through hole 11a. 12, a cylindrical bobbin 13 having one end provided in the through
hole 11a of the diaphragm 11, a flexible edge 14 continuously provided on the outer periphery
of the diaphragm 11, and a central portion of the diaphragm 11. And a damper 15 having
flexibility and vibration absorption.
[0028]
The edge 14 and the damper 15 are displaceable in the front-rear direction which is the axial
direction of the center pole 20 of the magnetic circuit 5 described later.
The damper 15 is provided with two layers of elastically displaceable portions in which ridges
and valleys are formed and supported by the damper ring 15a, and supports the bobbin 13
movably.
The damper 15 has a two-layered elastic displacement portion to prevent the rolling
phenomenon that occurs when the relatively long bobbin 13 vibrates.
Although the damper 15 is configured such that the two-layer elastic displacement portion is
supported by the damper ring 15a, the damper 15 may be configured by only a single elastic
displacement portion.
[0029]
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The magnetic circuit 5 which is a main part of the present embodiment is a so-called external
magnet type magnetic circuit, and as shown in FIG. 1, a voice coil 16 for vibrating the vibration
system 4 and a yoke 17 for forming a closed magnetic circuit. The drive magnet 18 applies a
magnetic flux to the yoke 17, and the cancel magnet 19 prevents the magnetic flux of the drive
magnet 18 from leaking to the outside of the magnetic circuit 5.
[0030]
Further, as shown in FIG. 1, the magnetic circuit 5 is provided adjacent to the cancel magnet 19
to form a first magnetic gap portion G 1, the top plate 21, the drive magnet 18 and the cancel
magnet 19. And an intermediate plate 22 provided therebetween to form a second magnetic gap
G2.
[0031]
The voice coil 16 is wound around and fixed to the outer peripheral portion of the bobbin 13 of
the vibration system 4.
Both end portions of the voice coil 16 are soldered to connection portions 25 provided on the
outer peripheral portion of the frame 6 via the tinsel wires 24 for connection wiring.
The voice coil 16 is provided only in the second magnetic gap G2 formed by the intermediate
plate 22 as shown in FIG.
[0032]
The yoke 17 is formed in a disk shape of a magnetic material, and is formed with a guide convex
portion 17 a for positioning the mounting position of the drive magnet 18. In addition, a
cylindrical center pole 20 is provided at a central portion of the yoke 17 so as to project
therefrom. The center pole 20 is inserted into the inner peripheral portion of the bobbin 13 of
the vibration system 4.
[0033]
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The driving magnet 18 is formed in an annular shape having a central hole 18 a, and the center
pole 20 is inserted into the central hole 18 a and provided on the yoke 17. As shown in FIG. 1,
the drive magnet 18 is magnetized with the N pole on the yoke 17 side and is magnetized with
the S pole on the intermediate plate 22 side. Further, the yoke 17 is magnetized such that the
position adjacent to the N pole side of the drive magnet 18 is N pole.
[0034]
The cancel magnet 19 is formed in an annular shape having a central hole 19 a, and the center
pole 20 is inserted through the central hole 19 a and provided on the intermediate plate 22. As
shown in FIG. 1, in the cancel magnet 19, the middle plate 22 side is magnetized to the S pole,
and the top plate 21 side is magnetized to the N pole.
[0035]
That is, the cancel magnet 19 is magnetized in the magnetic pole direction opposite to the
magnetic pole direction of the drive magnet 18 to prevent the magnetic flux of the drive magnet
18 from leaking to the outside of the magnetic circuit 5. The drive magnet 18 described above
forms a magnetic field stronger than the magnetic field formed by the cancel magnet 19.
[0036]
The top plate 21 is formed in an annular shape having a central hole 21 a of a magnetic material,
and the center pole 20 is inserted into the central hole 21 a and provided on the cancel magnet
19. The top plate 21 is formed such that the inner diameter of the center hole 21a is slightly
larger than the outer diameter of the bobbin 13, and a first magnetic gap portion G1 is formed
between the inner peripheral portion and the outer peripheral portion ing. The top plate 21 is
magnetized to the N pole as shown in FIG.
[0037]
The intermediate plate 22 is formed in an annular shape having a central hole 22a of a magnetic
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material, and the center pole 20 is inserted into the central hole 22a and provided between the
drive magnet 18 and the cancel magnet 19 There is. In this intermediate plate 22, the inner
diameter of the central hole 22a is formed to be slightly larger than the outer diameter of the
voice coil 16, and a second magnetic gap portion G2 is formed between the inner peripheral
portion and the outer peripheral portion of the center pole 20. doing. Then, as shown in FIG. 1,
this intermediate plate 22 is magnetized to the S pole.
[0038]
In the first magnetic gap portion G1, the gap is smaller than the gap of the second magnetic gap
portion G2, and the magnetic flux density by the cancel magnet 19 is increased.
[0039]
The bobbin 13 has a predetermined length so that the outer peripheral portions thereof face
each other in the first and second magnetic gap portions G1 and G2.
The voice coil 16 is disposed so as to be located only in the second magnetic gap portion G2. The
voice coil 16 has a weight substantially equal to the total weight of two voice coils when another
voice coil is disposed in the first magnetic gap portion G1.
[0040]
Although not shown, a conductive or non-conductive ring member or a ring member having a slit
formed therein is disposed in the first magnetic gap portion G1. When the ring member is not
disposed in the first magnetic gap portion G1, a conductive or nonconductive annular weight is
disposed at a position near the through hole 11a of the diaphragm 11.
[0041]
As shown in FIG. 1, the frame 6 is formed of a metal material in a substantially cylindrical shape
whose diameter is increased from the rear end side toward the front end side. A holding portion
27 for holding the vibration system 4 is formed on the front end side of the frame 6, and the
outer peripheral portion of the edge 14 of the vibration system 4 is fixed to the holding portion
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27 via an annular gasket 28. It is done.
[0042]
Further, the frame 6 is provided with a connecting portion 25 connected to the voice coil 16 at
the outer peripheral portion, and the connecting portion 25 is connected to a power supply
source (not shown).
[0043]
Further, in the speaker device 1, a shield cover 29 is provided to cover the magnetic circuit 5 in
order to further prevent the magnetic flux from leaking from the magnetic circuit 5 to the
outside.
The shield cover 29 is formed in a substantially bottomed cylindrical shape by a magnetic
material. The rear end of the yoke 17 is attached to the inner bottom surface of the shield cover
29 and the peripheral wall is brought close to the outer periphery of the top plate 21 so that the
yoke 17, the drive magnet 18 and the cancel The magnet 19 is surrounded.
[0044]
An assembling method of the magnetic circuit 5 configured as described above will be described
below. First, an adhesive is applied to the yoke 17, and the drive magnet 18 is fixed and attached
via the adhesive. The drive magnet 18 is provided so as to substantially coincide with the axis of
the center pole 20 by the guide convex portion 17a of the yoke 17 being inserted into the center
hole 18a and positioned.
[0045]
Then, an adhesive is applied to the drive magnet 18, and the intermediate plate 22 is fixed and
attached via the adhesive. The intermediate plate 22 is attached to the drive magnet 18 in a state
where a gap guide jig (not shown) is provided on the outer peripheral portion of the center pole
20 in order to set the second magnetic gap portion G2 at a predetermined interval. The drive
magnet 18 is magnetized in a desired magnetic pole direction after the adhesive is dried and
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solidified.
[0046]
Also, the top plate 21 is attached to the rear surface of the frame 6. An adhesive is applied to the
top plate 21 attached to the frame 6, and the cancel magnet 19 is fixed and attached via the
adhesive. The top plate 21 has a gap guide jig (not shown) for making the first magnetic gap
portion G1 have a predetermined interval by making the axis of the frame 6 substantially
coincident with the axis of the center hole 19a of the cancel magnet 19. It is attached to the
cancellation magnet 19 in the state provided in the center hole 21a. After the adhesive is dried
and solidified, the cancel magnet 19 is magnetized in a desired magnetic pole direction.
[0047]
With the gap guide jig described above provided on the center pole 20, the cancel plate 19 is
fixed and attached to the intermediate plate 22 with an adhesive. Then, the gap guide jig is
removed from the center pole 20 and the top plate 21 after the adhesive is dried and solidified.
[0048]
Next, in order to attach the voice coil 16, the voice coil 16 is positioned in the second magnetic
gap portion G2 of the magnetic circuit 5 at the outer peripheral portion of the center pole 20,
and the inner peripheral portion of the voice coil 16 and the center pole A voice coil spacer (not
shown) is provided concentrically with the outer peripheral portion of 20. The voice coil 16 is
attached to the outer peripheral portion of the bobbin 13 in a state where the voice coil spacer is
provided.
[0049]
With the damper 15 of the vibration system 4 in a state where the voice coil spacer is provided
on the center pole 20, the damper ring 15a on the outer peripheral side is attached to the inner
peripheral portion of the frame 6 via an adhesive. The outer peripheral portion of the bobbin 13
is attached via an adhesive. After the adhesive is dried and solidified, the tinsel wire 24
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connected to the voice coil 13 is soldered to the connection portion 25 provided on the frame 6.
[0050]
The outer peripheral portion of the diaphragm 11 of the vibration system 4 is attached to the
inner peripheral portion of the frame 6 via the edge 14, and the inner peripheral portion is
attached to the outer peripheral portion of the bobbin 13 via an adhesive. Further, after the voice
coil spacer is removed from the diaphragm 11, the cap 12 is attached to the inner peripheral
portion or one end of the bobbin 13 through an adhesive.
[0051]
By the way, after the drive cover 18 and the cancel magnet 19 are assembled, the shield cover 29
is attached to the rear side of the yoke 17 via an adhesive to cover the magnetic circuit 5 so that
the magnetic flux from these magnets 18 and 19 is Since the leakage to the outside can be
prevented, the subsequent assembly work can be easily performed. The shield cover 29 may be
attached to the magnetic circuit 5 through an adhesive after the assembly of the speaker device 1
is completed, or may be unnecessary depending on the use of the speaker device.
[0052]
The magnetic path of the magnetic circuit 5 of the speaker device 1 configured as described
above will be described with reference to FIG. The magnetic circuit 5 generates magnetic flux
from the drive magnet 18 and magnetic flux from the cancel magnet 19 in the second magnetic
gap section G2 as shown by arrows in FIG. The magnetic flux density is increased. Therefore, the
magnetic flux from the drive magnet 18 and the cancel magnet 19 acts on the voice coil 16 in
the second magnetic gap portion G2.
[0053]
Therefore, according to the speaker device 1, the magnetic flux density acting on the voice coil
16 is increased without increasing the size of the magnetic circuit 5, so that the sensitivity can be
increased even if the weight of the vibration system 4 is increased. it can.
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[0054]
Of course, the magnetic circuit 5 may be magnetized in a magnetic pole direction opposite to the
magnetic pole direction of the drive magnet 18 and the cancel magnet 19 described above.
[0055]
Then, in the speaker device 1, the resonance sharpness Q at the lowest resonance frequency can
be around 0.5, and can be close to 0.58.
Therefore, the speaker device 1 is small and inexpensive, and is very effective in reproducing the
bass band.
The conventional speaker device 51 shown in FIG. 3 described above has a resonance sharpness
Q of 0.83, and the conventional speaker device 52 shown in FIG. 4 has a resonance sharpness Q
of 0.73. .
[0056]
As described above, the speaker device 1 according to the embodiment includes the top plate 21
forming the first magnetic gap portion G1, the intermediate plate 22 forming the second
magnetic gap portion G2, and the second magnetic gap portion By providing the voice coil 16
disposed in G2, the magnetic fields of the drive magnet 18 and the cancel magnet 19 can be
effectively utilized, so that the magnetic flux density of the second magnetic gap portion G2
acting on the voice coil 16 It can be very large. Therefore, since this speaker device 2 can easily
bring the resonance sharpness Q at the lowest resonance frequency close to 0.58, it is possible to
maintain the small size and the low price and to improve the reproduction characteristic of the
bass band. .
[0057]
In the speaker device 1 described above, the voice coil 16 is disposed only in the second
magnetic gap portion G2, but voice coils are disposed in the first and second magnetic gap
portions G1 and G2, respectively. A speaker device 2 of another embodiment will be described
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with reference to FIG. Since the speaker device 2 has almost the same configuration as the abovedescribed speaker device 1, the same members are denoted by the same reference numerals and
the description thereof will be omitted.
[0058]
As schematically shown in FIG. 2, the magnetic circuit 35 of the speaker device 2 includes a top
plate 36 forming a first magnetic gap portion G3, an intermediate plate 37 forming a second
magnetic gap portion G4, and The voice coil 38 is disposed straddling the inside of the first
magnetic gap portion G3 and the second magnetic gap portion G4.
[0059]
A thin plate shaped cancel magnet 39 is disposed between the top plate 36 and the intermediate
plate 37.
The cancel magnet 39 is annularly formed of a magnetic material such as neodymium-based or
samarium-cobalt-based. The voice coil 38 is formed to have a length positioned across the inside
of the first magnetic gap portion G3 and the inside of the second magnetic gap portion G4.
Further, the vibration system 4 of the speaker device 2 includes a damper 40 having a single
elastic displacement portion.
[0060]
The magnetic path of the magnetic circuit 35 of the speaker device 2 configured as described
above will be described with reference to FIG. The magnetic circuit 35 generates magnetic flux
from the drive magnet 18 and magnetic flux from the cancel magnet 39 in the second magnetic
gap G3 as shown by arrows in FIG. The magnetic flux density is increased. Further, the magnetic
fluxes of the first and second magnetic gap portions G3 and G4 act on the voice coil 38,
respectively.
[0061]
According to the speaker device 2 described above, by providing the voice coil 38 disposed
across the first and second magnetic gap portions G3 and G4, the magnetic field formed by the
drive magnet 18 and the cancel magnet 39 is generated. Furthermore, since the resonance
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sharpness Q at the lowest resonance frequency can be easily brought close to 0.58 by sufficiently
utilizing effectively, it is possible to maintain the small size and the low price and to improve the
reproduction characteristics of the bass band. .
[0062]
Although not shown, the speaker device 2 may have a configuration in which the first voice coil
and the second voice coil are disposed in the first and second magnetic gap portions G3 and G4.
[0063]
Although the magnetic circuits 5 and 35 of the speaker devices 1 and 2 according to the present
embodiment are configured to have the first and second magnetic gap portions G1 and G2, by
providing other plates and magnets. Furthermore, a plurality of magnetic gap portions may be
provided.
[0064]
As described above, according to the speaker device of the present invention, the first plate
forming the first magnetic gap portion, the second plate forming the second magnetic gap
portion, and the second plate By providing the voice coil disposed in the second magnetic gap
portion, the magnetic field of the drive magnet and the magnetic shielding magnet can be
effectively used, so that the magnetic flux density of the second magnetic gap portion can be
greatly increased. .
Therefore, since this speaker device can easily reduce the resonance sharpness Q at the lowest
resonance frequency, it is possible to maintain the compactness and inexpensiveness and to
improve the reproduction characteristics of the bass band.
[0065]
Brief description of the drawings
[0066]
1 is a longitudinal sectional view showing a speaker device according to the present invention.
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[0067]
2 is a longitudinal sectional view showing another example of the speaker device according to
the present invention.
[0068]
3 is a longitudinal sectional view showing a conventional speaker device.
[0069]
4 is a longitudinal sectional view showing a conventional speaker device.
[0070]
Explanation of sign
[0071]
Reference Signs List 1 speaker device 16 voice coil 17 yoke 18 drive magnet 19 cancel magnet
20 center pole 21 top plate 22 middle plate G1 first magnetic gap portion G2 second magnetic
gap portion
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