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DESCRIPTION JP2000188798

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DESCRIPTION JP2000188798
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker suitable for a small speaker and a speaker apparatus using the speaker.
[0002]
2. Description of the Related Art Conventionally, a small speaker as shown in FIG. 6 has been
proposed. As shown in FIG. 6, this speaker has a ring magnet 1 in which N and S poles are
magnetized in the vertical direction, a ring plate 2 mounted so as to sandwich the ring magnet 1,
a center pole 3a and a flange A yoke 3 integrally formed with 3b is provided, and a magnetic gap
4 is formed between the inner peripheral surface of the plate 2 and the outer peripheral surface
of the center pole 3a of the yoke 3.
[0003]
A speaker frame 5 is attached to the plate 2, an edge 7 is provided on the outer peripheral
portion of the diaphragm 6, and the outer peripheral portion of the conical diaphragm 6 is held
by the frame 5 by the edge 7. 8はガスケットである。
[0004]
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1
On the other hand, a voice coil bobbin 9 is attached to the inner peripheral portion of the
diaphragm 6, and a voice coil 10 is wound around the voice coil bobbin 9. The voice coil 10 is
formed by the plate 2 and the center pole 3a of the yoke 3. The magnetic gap 4 is inserted.
[0005]
Further, in FIG. 6, reference numeral 11 denotes a damper for holding the voice coil 10 in the
magnetic gap 4.
As the damper 11, for example, a spiral damper in which a cloth is impregnated with a synthetic
resin is used.
[0006]
Reference numeral 12 denotes an input terminal, and an acoustic signal from the input terminal
12 is supplied to the voice coil 10 through the tinsel wire 13. Reference numeral 14 denotes a
dust intrusion preventing cap which covers the upper surface of the voice coil bobbin 9.
[0007]
In the speaker as shown in FIG. 6, the ring-shaped magnet 1 → plate 2 → magnetic gap 4 →
center pole 3a of the yoke 3 → flange 3b → ring-shaped magnet 1 constitutes a magnetic circuit.
As shown in FIG. 6, a magnetic flux flows directly from the plate 2 to the flange 3b of the yoke 3
and causes a leakage flux to flow to the flange 3b of the yoke 3 to drive the diaphragm 6, as
shown in FIG. There was a disadvantage that only about 1/3 of the power was used.
[0008]
A speaker using a cancel magnet as shown in FIG. 7 has been proposed as a speaker for
eliminating such a leakage flux.
The parts corresponding to those in FIG. 6 will be assigned the same reference numerals as those
in FIG.
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2
[0009]
In FIG. 7, a ring-shaped cancel magnet 15 magnetized in the opposite direction to the ringshaped magnet 1 for main drive is attached near the lower surface outer periphery of the flange
3b of the yoke 3 in FIG. A bottomed cylindrical shield cover 16 is attached so as to cover the
magnet 15 so as to eliminate the leakage flux. Others are configured in the same manner as in
FIG.
[0010]
Such a speaker as shown in FIG. 7 requires a cancel magnet 15 in order to obtain a magnetic
shield type, and the cancel magnet 15 has a reverse polarity to that of the main ring-shaped
magnet 1. It is necessary to magnetize it and bond it to the rear face of this main ring-shaped
magnet 1, and also to provide a magnetic shield cover 16. The magnetic circuit configuration
becomes large and the magnetic shield type speaker diaphragm 6 is driven. The magnetic force
(magnetic flux) in the air gap 4 does not increase so much, for example, only about 10%, and the
magnetic force of the cancel magnet 15 is not used for driving the diaphragm 6 at all.
[0011]
In view of such a point, the present invention proposes a speaker and a speaker device in which a
magnetic shield type speaker is obtained with a simple configuration and magnetic force
(magnetic flux) of a magnetic gap for driving a diaphragm is increased. It is a thing.
[0012]
The speaker according to the present invention comprises a wedge-shaped yoke having a center
pole, an outer peripheral portion of which abuts against an upper end portion of the wedgeshaped yoke and an inner peripheral surface and an outer peripheral surface of the center pole.
A first plate disposed to form a first magnetic gap, a first ring-shaped magnet disposed on the
first plate, an inner circumferential surface and a center pole on the first ring-shaped magnet A
second plate disposed so as to form a second magnetic gap between the outer circumferential
surface of the second ring, and a second plate magnetized in the same direction as the first ring
magnet disposed on the lower surface of the first plate A ring-shaped magnet, and a third plate
disposed on the lower surface of the second ring-shaped magnet so as to form a third magnetic
gap between the inner circumferential surface and the outer circumferential surface of the center
pole; 2 and 3rd magnetic air gaps It is obtained so as to drive more diaphragm.
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3
[0013]
Thus, according to the present invention, the magnetic flux from the respective N poles of the
first and second ring magnets passes through the wedge shaped yoke having the first, second
and third plates and the center pole. Since the magnetic circuit returning to the respective S poles
of the first and second ring-shaped magnets is configured, a magnetically shielded speaker can
be obtained with a simple configuration.
[0014]
Further, according to the present invention, since the diaphragm is driven by the second and
third magnetic gaps in which the leakage flux is reduced and the magnetic fluxes from the two
ring magnets are respectively concentrated, the diaphragm is driven. The speaker device which
can increase the power of the magnetic field, improve the sensitivity and sound quality, reduce
the resonance acuity Q at the lowest resonance frequency of the speaker bass, and expand the
bass reproduction band when using a small speaker box You can get
[0015]
Further, according to the speaker of the present invention, there is provided a wedge-shaped
yoke having a center pole, a first ring-shaped magnet disposed on the bottom of the wedgeshaped yoke, an inner circumferential surface and the center pole on the first ring-shaped
magnet. A first plate disposed to form a first magnetic gap between the outer circumferential
surface of the first ring and a second ring magnetized in a direction opposite to the first ring
magnet disposed on the first plate And a second magnetic gap formed between the inner
circumferential surface and the outer circumferential surface of the center pole on the second
ring magnet, and the outer circumferential portion is disposed so as to abut the upper end
portion of the wedge-shaped yoke A second ring plate, a third ring magnet magnetized in the
same direction as the second ring magnet disposed on the second plate, and an inner periphery
of the third ring magnet Face and this sen And a third plate arranged as to form a third magnetic
gap between the outer peripheral surface of the Poru, in which so as to drive the diaphragm by
the first magnetic gap.
[0016]
According to the present invention, the magnetic flux from each of the N poles of the first,
second and third ring magnets passes through a wedge shaped yoke having the first, second and
third plates and a center pole. Since the magnetic circuit which returns to the S pole of each of
the first, second and third ring-shaped magnets is formed, a magnetically shielded speaker can be
obtained with a simple configuration.
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4
[0017]
Further, according to the present invention, the diaphragm is driven by the first magnetic gap in
which the leakage flux is reduced and the magnetic flux from the three ring magnets flows in the
same direction. Of the speaker, the sensitivity and the sound quality are improved, and the
resonance acuity Q at the lowest resonance frequency of the speaker's bass can be reduced, and
a speaker apparatus capable of expanding the bass reproduction band when using a small
speaker box is obtained. be able to.
[0018]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the speaker
according to the present invention will be described below with reference to FIG.
In FIG. 1, parts corresponding to FIG. 6 are given the same reference numerals.
[0019]
In the example of FIG. 1, the outer peripheral edge of the ring-shaped plate 21 is adhesively fixed
to the circular upper end face of the side wall 20c of the wedge-shaped yoke 20 integrally
formed with the relatively long center pole 20a. And the outer peripheral surface of the center
pole 20a of the wedge-shaped yoke 20 form a magnetic gap 22.
[0020]
A ring-shaped magnet 23 having N and S poles magnetized in the vertical direction is adhered
and fixed on the inner peripheral side of the plate 21 so that the S pole abuts on the plate 21.
In this case, the center pole 20a passes through the ring-shaped magnet 23.
[0021]
A ring-shaped plate 24 is bonded and fixed onto the N pole of the ring-shaped magnet 23, and a
magnetic gap 25 is formed between the inner peripheral surface of the plate 24 and the outer
peripheral surface of the center pole 20a.
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5
[0022]
Further, on the lower surface of the plate 21, a ring-shaped magnet 26 in which N and S poles
are magnetized in the vertical direction is adhered and fixed so that the N pole is in contact with
the lower surface of the plate 21.
In this case, the ring magnet 26 has substantially the same shape as the ring magnet 23, and the
ring magnet 26 and the ring magnet 23 are magnetized in the same direction.
[0023]
A ring-shaped plate 27 is adhered and fixed to the lower surface of the south pole of the ringshaped magnet 26, and a magnetic gap 28 is formed between the inner peripheral surface of the
plate 27 and the outer peripheral surface of the center pole 20a.
[0024]
The speaker frame 5 is attached to the upper surface of the outer periphery of the plate 21 and
the outer peripheral portion of the cone-shaped diaphragm 6 provided with the edge 7 is held by
the gasket 8 on the outer peripheral portion of the frame 5.
[0025]
On the other hand, a voice coil bobbin 9 is attached to the inner peripheral portion of the
diaphragm 6, and two voice coils 10a and 10b wound in opposite directions to each other are
wound on the voice coil bobbin 9 The coils 10a and 10b are inserted into the magnetic gaps 25
and 28, respectively.
[0026]
In this example, the magnetic flux from the N pole of the ring magnet 23 is the N pole of the ring
magnet 23 → plate 24 → magnetic air gap 25 → center pole 20 a → magnetic air gap 22 →
plate 21 → S pole of the ring magnet 23 Magnetic circuit of the ring magnet 23 → N pole of the
ring magnet 23 → plate 24 → magnetic gap 25 → center pole 20 a → magnetic gap 28 → plate
27 → S pole of the ring magnet 26 → N pole → plate 21 → ring magnet 23 The magnetic circuit
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6
of the S pole (in this magnetic circuit, the magnetic flux of the ring-shaped magnet 26 is also
added.
And the magnetic pole 25 of the ring magnet 23 → the plate 24 → the magnetic gap 25 → the
center pole 20a → the bottom 20b of the wedge-shaped yoke 20 → the side wall 20c → the plate
21 → the magnetic circuit of the S pole of the ring magnet 23.
[0027]
The magnetic flux from the N pole of the ring magnet 26 is the N pole of the ring magnet 26 →
plate 21 → magnetic gap 22 → center pole 20 a → magnetic gap 28 → plate 27 → S pole
magnetic circuit of the ring magnet 26 And the magnetic circuit of the north pole of the ring
magnet 26 → plate 21 → side wall 20c of the wedge-shaped yoke 20 → bottom 20b → center
pole 20a → magnetic gap 28 → plate 27 → S pole of the ring magnet 26.
[0028]
Therefore, the magnetic flux from the ring magnets 23 and 26 flows intensively in the magnetic
gaps 25 and 28 and the magnetic force (magnetic flux) of the magnetic gaps 25 and 28
increases.
[0029]
Further, the voice coils 10a and 10b are held by the dampers 11 in the magnetic gaps 25 and 28,
respectively.
As the damper 11, for example, a spiral damper in which a cloth is impregnated with a synthetic
resin is used.
Further, a cap 14 for preventing dust intrusion is provided so as to cover the upper surface of the
voice coil bobbin 9.
Further, an acoustic signal from the input terminal 12 provided at a predetermined position of
the frame 5 is supplied to the voice coils 10a and 10b through the tinsel wire 13.
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7
[0030]
Since the present embodiment is configured as described above, the magnetic flux from the
respective N poles of the ring magnets 23 and 26 passes through the wedge shaped yoke 20
having the plates 21, 24 and 27 and the center pole 20a to form this ring shape. Since the
magnetic circuit that returns to the respective S poles of the magnets 23 and 26 is configured, a
magnetically shielded speaker can be obtained with a simple configuration.
[0031]
Further, according to this embodiment, the voice coils 10a and 10b for driving the diaphragm 6
are driven by the magnetic gaps 25 and 28 in which the leakage flux is reduced and the magnetic
fluxes from the two ring magnets 23 and 26 are concentrated respectively. Therefore, the
magnetic force for driving the diaphragm 6 is increased, the sensitivity and the sound quality are
improved, and the resonance acuity Q at the lowest resonance frequency of the bass of the
speaker can be reduced, and a small speaker box is used. Thus, it is possible to obtain a speaker
device capable of expanding the bass reproduction band.
[0032]
2 and 3 respectively show other examples of the embodiment of the speaker according to the
present invention.
The parts corresponding to those of FIG. 1 will be denoted by the same reference numerals and
the detailed description thereof will be omitted.
[0033]
In the example of FIG. 2, in the example of FIG. 1, the ring-shaped magnet 26 is a ring-shaped
magnet 29 whose magnetization direction is reversed.
[0034]
That is, in the example of FIG. 2, the outer peripheral edge of the ring-shaped plate 21 is
adhesively fixed to the circular upper end face of the side wall 20c of the wedge-shaped yoke 20
integrally formed with the relatively long center pole 20a. A magnetic gap 22 is formed between
the circumferential surface and the outer circumferential surface of the center pole 20 a of the
wedge-shaped yoke 20.
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8
[0035]
A ring-shaped magnet 23 having N and S poles magnetized in the vertical direction is adhered
and fixed on the inner peripheral side of the plate 21 so that the S pole abuts on the plate 21.
In this case, the center pole 20 a passes through the ring-shaped magnet 23.
[0036]
A ring-shaped plate 24 is bonded and fixed onto the N pole of the ring-shaped magnet 23, and a
magnetic gap 25 is formed between the inner peripheral surface of the ring-shaped plate 24 and
the outer peripheral surface of the center pole 20a.
[0037]
In the example of FIG. 2, a ring-shaped magnet 29 having N and S poles magnetized in the
vertical direction is adhered and fixed to the lower surface of the plate 21 such that the S pole is
in contact with the lower surface of the plate 21.
In this case, the ring magnet 29 has substantially the same shape as the ring magnet 23, and the
ring magnet 29 and the ring magnet 23 are magnetized in opposite directions.
[0038]
A ring-shaped plate 27 is adhered and fixed to the lower surface of the N pole of the ring-shaped
magnet 29, and a magnetic gap 28 is formed between the inner peripheral surface of the plate
27 and the outer peripheral surface of the center pole 20a.
In the example of FIG. 2, the rest is configured in the same manner as the example of FIG.
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9
[0039]
In the example of FIG. 2, the magnetic flux from the N pole of the ring magnet 23 is N pole of the
ring magnet 23 → plate 24 → magnetic air gap 25 → center pole 20 a → magnetic air gap 22 →
plate 21 → ring magnet 23 Magnetic circuit of S pole, N pole of ring magnet 23 → plate 24 →
magnetic gap 25 → center pole 20 a → bottom 20 b of wedge shaped yoke 20 → side wall 20 c
→ plate 21 → magnet of S pole of ring magnet 23 It flows with the circuit.
[0040]
The magnetic flux from the N pole of the ring magnet 29 is the N pole of the ring magnet 29 →
plate 27 → magnetic air gap 28 → center pole 20 a → magnetic air gap 22 → plate 21 → S pole
of the ring magnet 29 S magnetic circuit And the magnetic circuit of the N pole of the ring
magnet 29 → plate 27 → magnetic gap 28 → center pole 20 a → bottom portion 20 b of the
wedge shaped yoke 20 → side wall 20 c → plate 21 → S pole of the ring magnet 29.
[0041]
Therefore, the magnetic flux from the ring magnets 23 and 29 flows intensively to the magnetic
gaps 25 and 28, and the magnetic force (magnetic flux) of the magnetic gaps 25 and 28
increases.
Therefore, it can be easily understood that the same function and effect as the example of FIG. 1
can be obtained also in the example of FIG. 2.
[0042]
In the example of FIG. 3, a ring-shaped magnet 30 in which N and S poles are magnetized in the
vertical direction on the bottom portion 20b of the wedge-shaped yoke 20 integrally formed with
a relatively long center pole 20a The adhesive is fixed so as to abut on the bottom 20 b of 20.
In this case, the center pole 20a passes through the ring-shaped magnet 30.
[0043]
A ring-shaped plate 27 is adhered and fixed onto the south pole of the ring-shaped magnet 30,
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10
and a magnetic gap 28 is formed between the inner peripheral surface of the plate 27 and the
outer peripheral surface of the center pole 20a.
[0044]
A ring-shaped magnet 26 having N and S poles magnetized in the vertical direction is adhered
and fixed onto the plate 27 so that the S pole abuts on the plate 27.
In this case, the ring-shaped magnet 26 and the ring-shaped magnet 30 have the same shape,
and the ring-shaped magnet 26 and the ring-shaped magnet 30 are magnetized in opposite
directions to each other.
[0045]
A ring-shaped plate 21 is bonded and fixed onto the N pole of the ring-shaped magnet 26, and a
magnetic gap 22 is formed between the inner peripheral surface of the plate 21 and the outer
peripheral surface of the center pole 20a. The outer peripheral edge portion of the above is
bonded and fixed onto the circular upper end face of the wedge-shaped yoke 20.
[0046]
A ring-shaped magnet 23 having N and S poles magnetized in the vertical direction is adhered
and fixed on the inner peripheral side of the plate 21 so that the S pole abuts on the plate 21.
In this case, the center pole 20a passes through the ring-shaped magnet 23.
[0047]
A ring-shaped plate 24 is bonded and fixed onto the N pole of the ring-shaped magnet 23, and a
magnetic gap 25 is formed between the inner peripheral surface of the plate 24 and the outer
peripheral surface of the center pole 20a.
[0048]
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11
Further, in the example of FIG. 3, the voice coil 10 is wound around a voice coil bobbin 9
attached to the inner peripheral portion of the diaphragm 6, and this voice coil 10 is inserted
into the magnetic gap 28.
The other components in FIG. 3 are the same as those in FIG.
[0049]
In the example of FIG. 3, the magnetic flux from the N pole of the ring magnet 23 is the N pole of
the ring magnet 23 → plate 24 → magnetic air gap 25 → center pole 20 a → magnetic air gap
22 → plate 21 → ring magnet 23 S Magnetic circuit of the pole, N pole of ring magnet 23 →
plate 24 → magnetic gap 25 → center pole 20a → magnetic gap 28 → plate 27 → S pole of ring
magnet 26 → N pole → plate 21 → ring magnet 23 The magnetic circuit of the S pole of (The
magnetic circuit of the ring-shaped magnet 26 is also added to this magnetic circuit.
And the magnetic pole 25 of the ring magnet 23 → the plate 24 → the magnetic gap 25 → the
center pole 20a → the bottom 20b of the wedge-shaped yoke 20 → the side wall 20c → the plate
21 → the magnetic circuit of the S pole of the ring magnet 23.
[0050]
The magnetic flux from the N pole of the ring magnet 26 is the N pole of the ring magnet 26 →
plate 21 → magnetic gap 22 → center pole 20 a → magnetic gap 28 → plate 27 → S pole
magnetic circuit of the ring magnet 26 And the magnetic circuit of the north pole of the ring
magnet 26 → plate 21 → side wall 20c of the wedge-shaped yoke 20 → bottom 20b → center
pole 20a → magnetic gap 28 → plate 27 → S pole of the ring magnet 26.
[0051]
Further, the magnetic flux from the N pole of the ring magnet 30 is the N pole of the ring magnet
30 → the bottom 20 b of the wedge shaped yoke 20 → the center pole 20 a → the magnetic gap
28 → the plate 27 → the magnetic pole of the S pole of the ring magnet 30 Flow through the
circuit.
[0052]
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12
Therefore, the magnetic flux in the same direction from the three ring magnets 23, 26 and 30
flows in the magnetic gap 28, and the magnetic force (magnetic flux) of the magnetic gap 28
increases.
[0053]
Thus, according to the example of FIG. 3, the magnetic flux from the respective N poles of the
three ring magnets 23, 26 and 30 passes through the wedge shaped yoke 20 having the three
plates 21, 24 and 27 and the center pole 20a. Since the magnetic circuit which returns to the S
pole of each of the three ring-shaped magnets 23, 26 and 30 is formed, a magnetically shielded
speaker can be obtained with a simple configuration.
[0054]
Further, according to the present embodiment, since the diaphragm 6 is driven by the magnetic
gap 28 in which the leakage flux is reduced and the flux from the three ring magnets 23, 26 and
30 flows in the same direction, this vibration is generated. The magnetic force for driving the
plate 6 is increased, the sensitivity and the sound quality are improved, and the resonance acuity
Q at the lowest resonance frequency of the speaker's bass can be reduced, and the bass
reproduction band when using a small speaker box A speaker device that can be expanded can
be obtained.
[0055]
4 and 5 each show an example of the embodiment of the speaker apparatus of the present
invention.
The example of FIG. 4 shows an example of a phase-reversal speaker apparatus in which the
speaker of FIG. 1 is attached to a small-sized speaker box 40.
4 will be described with reference to FIG. 4. In FIG. 4, a speaker sound emission hole 41a is
formed in a baffle plate 41 provided on the front surface of the speaker box 40 which is formed
into a substantially rectangular parallelepiped by ABS resin or the like. Fix the speaker as shown
in the example.
[0056]
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13
Further, an acoustic signal from the input terminal 42 provided at a predetermined position
outside the speaker box 40 is supplied to the input terminal 12 of the speaker via the connection
line 43, and the acoustic signal from the input terminal 12 is It is supplied to the voice coils 10a
and 10b.
[0057]
Further, a first duct 44 having an opening 44 a in the same plane as the speaker sound emission
hole 41 a of the baffle plate 41 is provided, and a second duct 45 having a larger duct diameter
than the first duct 44 is formed as the first duct 44. The air is emitted from the opening 44a of
the first duct 44 through the opening 45a of the second duct 45 so as to overlap within the
predetermined length of the first and to be integrated with the rear plate so that a concentric
cross section is formed. To be configured.
It is a so-called folded duct configuration.
[0058]
In this case, the reaction force of the duct radiation forces FD1 and FD2 of the first and second
ducts 44 and 45-FD1 and -FD2 respectively cancel each other, and the duct radiation forces of
the first and second ducts 44 and 45 This speaker box 40 does not swing depending on FD1 and
FD2.
[0059]
Further, the phase of the sound emitted from the back of the diaphragm 6 of this speaker is
inverted and radiated from the first and second ducts 44 and 45 to the outside of the speaker
box 40, and exits from the front of the diaphragm 6. I try to expand the low range of the sound.
[0060]
In the speaker device according to the present embodiment, as described above, since the
magnetic force for driving the diaphragm 6 of the speaker is strong, the sensitivity and the sound
quality of the speaker device are improved and the resonance sharpness Q at the lowest
resonance frequency of the bass of the speaker is It is possible to obtain a speaker device that
can be made smaller and that can expand the bass reproduction band when the small speaker
box 40 is used.
12-04-2019
14
[0061]
Further, FIG. 5 shows a phase inversion type speaker device in which the speaker of FIG. 3 is
attached to a small-sized speaker box 40.
In this FIG. 5 example, the same code | symbol is attached | subjected and shown to the part
corresponding to FIG. 4 example and FIG. 3 example, and the detailed description is abbreviate |
omitted.
[0062]
It can be easily understood that the same function and effect as those in FIG. 4 can be obtained
also in this example in FIG.
Further, it can be easily understood that the same operation and effect as in the example of FIG. 4
can be obtained also when the speaker shown in the example of FIG. 2 is attached to the small
speaker box 40 as in the example of FIG.
[0063]
It goes without saying that the present invention is not limited to the above-described example
and that various other configurations can be adopted without departing from the scope of the
present invention.
[0064]
According to the present invention, the magnetic flux from the north pole of the ring magnet
passes through the wedge-shaped yoke having the first, second and third plates and the center
pole, and Since the magnetic circuit returning to the pole is configured, it is possible to obtain a
magnetically shielded speaker with a simple configuration.
[0065]
Further, according to the present invention, since the diaphragm is driven by the magnetic gap in
which the leakage flux is reduced and the magnetic flux from the ring-shaped magnet is
12-04-2019
15
concentrated, the magnetic force for driving the diaphragm is increased. In addition, the sound
quality is improved, and the resonance sharpness Q at the lowest resonance frequency of the
speaker's bass can be reduced, and a speaker apparatus capable of expanding the bass
reproduction band when using a small speaker box can be obtained.
12-04-2019
16
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