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DESCRIPTION JP2000184493

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DESCRIPTION JP2000184493
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker suitable for application to a small speaker.
[0002]
2. Description of the Related Art Conventionally, a small speaker as shown in FIG. 5 has been
proposed. As shown in FIG. 5, this speaker comprises a ring magnet 1 having N and S poles
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. 5, 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. 5, 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. 5, since the magnetic poles 3 and 4 have different polarities, the magnetic flux
flows directly from the plate 2 to the flange 3b of the yoke 3 to generate a leakage magnetic flux,
and use is made about 1/3 of the magnetic force of the ring magnet 1 There was no
inconvenience.
[0008]
A speaker using a cancel magnet as shown in FIG. 6 has been proposed as a speaker for
eliminating such a leakage flux.
The parts corresponding to those in FIG. 5 will be assigned the same reference numerals as those
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in FIG.
[0009]
In FIG. 6, 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 of 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. 6 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. The magnetic shield cover 16 must be attached to the back surface of the main ringshaped magnet 1, and the magnetic circuit becomes large and the magnetic gap driving the
diaphragm 6 of the magnetically shielded speaker is required. The magnetic force (magnetic flux)
4 does not increase so much, for example, by 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 in which a magnetic shield type
speaker is obtained with a simple configuration and the magnetic force (magnetic flux) of the
magnetic gap for driving the diaphragm is increased. .
[0012]
SUMMARY OF THE INVENTION A loudspeaker according to the present invention comprises a
wedge-shaped yoke having a center pole, a first ring-shaped magnet disposed on the bottom of
the wedge-shaped yoke, and a first ring-shaped magnet. The first plate is disposed so as to form a
first magnetic gap between the inner circumferential surface and the outer circumferential
surface of the center pole, and the first plate is disposed opposite to the first ring magnet
disposed on the first plate. A second magnetic gap is formed between the magnetized second ring
magnet, the inner circumferential surface and the outer circumferential surface of the center pole
on the second ring magnet, and the outer circumferential portion is the upper end of the wedgeshaped yoke. And a second plate arranged to abut the portion, and the first magnetic gap drives
the diaphragm.
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[0013]
According to the present invention, the magnetic flux from each of the N poles of the first and
second ring magnets passes through the wedge shaped yoke having the first and second plates
and the center pole to thereby carry out the first and second yokes. A magnetic shield type
speaker can be obtained with a simple configuration that does not require a canceling magnet or
the like because the magnetic circuit for returning to the respective S poles of the ring-shaped
magnet is formed.
[0014]
Further, according to the present invention, the diaphragm is driven by the first magnetic gap in
which the leakage magnetic flux decreases and the magnetic flux from the two ring-shaped
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.
[0015]
Further, in the present invention, in the above description, the magnetic strength of the second
ring-shaped magnet is set to about half of the magnetic strength of the first ring-shaped magnet.
[0016]
According to the present invention, in addition to the same function and effect as described
above, the magnetic flux from the first and second ring-shaped magnets flowing through the
second magnetic gap cancel each other, and the magnetic flux is It can be substantially zero, and
the magnetism of the frame of the speaker fixed to this second plate is eliminated.
[0017]
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. 5 are given the same reference numerals.
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4
[0018]
In the example of FIG. 1, the ring-shaped magnet 21 in which the N pole and the S pole are
magnetized in the vertical direction on the bottom portion 20b of the wedge shaped yoke 20
integrally formed with the center pole 20a is the bottom portion of the wedge shaped yoke 20
Adhesively fix so as to abut on 20b.
In this case, the ring-shaped magnet 21 is formed such that the center pole 20 a passes through,
and the ring-shaped magnet 21 is positioned by the magnet guide 20 d provided on the bottom
20 b of the wedge-shaped yoke 20.
[0019]
A ring-shaped plate 22 is adhered and fixed onto the S pole of the ring-shaped magnet 21 and a
magnetic gap 23 is formed between the inner peripheral surface of the plate 22 and the outer
peripheral surface of the center pole 20a.
[0020]
A ring-shaped magnet 24 having N and S poles magnetized in the vertical direction is adhered
and fixed onto the plate 22 so that the S pole abuts on the plate 22.
In this case, the ring-shaped magnet 24 and the ring-shaped magnet 21 are magnetized in
opposite directions to each other.
[0021]
A ring-shaped plate 25 is bonded and fixed onto the N pole of the ring-shaped magnet 24 and a
magnetic gap 26 is formed between the inner peripheral surface of the plate 25 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.
[0022]
Further, the frame 5 of the speaker is attached to the upper surface of the plate 25, and the outer
peripheral portion of the cone-shaped diaphragm 6 provided with the edge 7 on the outer
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peripheral portion thereof is held by the gasket 8.
[0023]
On the other hand, a voice coil bobbin 9 is attached to the inner peripheral portion of the
diaphragm 6, a voice coil 10 is wound around the voice coil bobbin 9, and this voice coil 10 is
inserted into the magnetic gap 23 in this example.
[0024]
In this example, the magnetic flux from the N pole of the ring magnet 21 is N pole of the ring
magnet 21 → bottom portion 20b of the wedge shaped yoke 20 → center pole 20 a → magnetic
gap 23 → plate 22 → S of the ring magnet 21 Magnetic circuit of pole and N pole of ring magnet
21 → bottom 20b of wedge shaped yoke 20 → side wall 20c → plate 25 → magnetic gap 26 →
center pole 20a → magnetic gap 23 → plate 22 → S pole of ring magnet 21 Flow through the
magnetic circuit.
[0025]
The magnetic flux from the N pole of the ring magnet 24 is the N pole of the ring magnet 24 →
plate 25 → magnetic gap 26 → center pole 20 a → magnetic gap 23 → plate 22 → magnetic
circuit of S pole of the ring magnet 24 and The magnetic circuit of the ring magnet 24 flows
through the N pole → the plate 25 → the side wall 20c of the wedge shaped yoke 20 → the
bottom 20b → the center pole 20a → magnetic air gap 23 → the plate 22 → the S pole of the
ring magnet 24.
[0026]
Accordingly, magnetic flux in the same direction from the two ring-shaped magnets 21 and 24
flows in the magnetic gap 23, and the magnetic force (magnetic flux) of the magnetic gap 23
becomes strong.
[0027]
Further, the voice coil 10 is held by the damper 11 in the magnetic gap 23.
As the damper 11, for example, a spiral damper in which a cloth is impregnated with a synthetic
resin is used.
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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 coil 10 through the tinsel wire 13.
[0028]
Since this example is configured as described above, the magnetic flux from the respective N
poles of the ring magnets 21 and 24 passes through the wedge-shaped yoke 20 having the
center pole 20a and the two plates 22 and 25, respectively. A magnetic shield type speaker can
be obtained with a simple configuration that constitutes a magnetic circuit that returns to the S
poles 21 and 24 and does not require a cancel magnet and a magnetic shield cover.
[0029]
Further, according to the present embodiment, the voice coil 10 for driving the diaphragm 6 is
driven by the magnetic gap 23 in which the leakage magnetic flux decreases and the magnetic
flux of the two ring magnets 21 and 24 flows in the same direction. Therefore, the magnetic
force of the magnetic gap 23 for driving the voice coil 10 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 reproduction band of the low-pitched sound.
[0030]
2 to 4 show other examples of the embodiment of the speaker according to the present
invention.
In the description of FIGS. 2 to 4, the parts corresponding to the example of FIG. 1 are denoted
by the same reference numerals, and the detailed description thereof is omitted.
[0031]
In the example of FIG. 2, in the example of FIG. 1, the wedge-shaped yoke 20 having the center
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7
pole 20a is configured by the yoke 27 and the cylindrical yoke 28 integrally formed with the
center pole 27a and the flange 27b.
[0032]
That is, in the example of FIG. 2, the ring-shaped magnet 21 in which the N pole and the S pole
are magnetized in the vertical direction on the flange 27 b of the yoke 27 integrally formed with
the center pole 27 a and the flange 27 b The adhesive is fixed so as to abut on the flange 27b of
the
In this case, the center pole 27a passes through the ring-shaped magnet 21 and the ring-shaped
magnet 21 is positioned by the magnet guide 27c provided on the flange 27b of the yoke 27.
[0033]
A ring-shaped plate 22 is bonded and fixed onto the south pole of the ring-shaped magnet 21
and a magnetic gap 23 is formed between the inner peripheral surface of the plate 22 and the
outer peripheral surface of the center pole 27a.
[0034]
A ring-shaped magnet 24 having N and S poles magnetized in the vertical direction is adhered
and fixed onto the plate 22 so that the S pole abuts on the plate 22.
In this case, the ring-shaped magnet 21 and the ring-shaped magnet 24 are magnetized in
opposite directions.
[0035]
A ring-shaped plate 25 is bonded and fixed onto the N pole of the ring-shaped magnet 24, and a
magnetic gap 26 is formed between the inner peripheral surface of the plate 25 and the outer
peripheral surface of the center pole 27a.
[0036]
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Further, in the example of FIG. 2, the cylindrical yoke 28 having a predetermined length is
adhered and fixed so that the inner peripheral surface abuts on the outer peripheral surface of
the flange 27b of the yoke 27 and the outer peripheral surface of the plate 25.
In the example of FIG. 2, the rest is configured in the same manner as the example of FIG.
[0037]
In the example of FIG. 2, the magnetic flux from the N pole of the ring magnet 21 is: N pole of the
ring magnet 21 → flange 27 b of the yoke 27 → center pole 27 a → magnetic gap 23 → plate 22
→ ring magnet 21 Magnetic circuit of S pole, N pole of ring magnet 21 → flange 27 b of yoke 27
→ cylindrical yoke 28 → plate 25 → magnetic gap 26 → center pole 27 a → magnetic gap 23 →
plate 22 → ring magnet 21 S It flows with the magnetic circuit of the pole.
[0038]
Further, the magnetic flux from the N pole of the ring magnet 24 is the N pole of the ring magnet
24 → plate 25 → magnetic gap 26 → center pole 27 a → magnetic gap 23 → plate 22 → S pole
magnetic circuit of the ring magnet 24 The magnetic circuit of the ring magnet 24 flows through
the N pole → the plate 25 → the cylindrical yoke 28 → the flange 27b of the yoke 27 → the
center pole 27a → the magnetic air gap 23 → the plate 22 → the S pole of the ring magnet 24.
[0039]
Therefore, the magnetic flux in the same direction from the two ring-shaped magnets 21 and 24
flows in the magnetic gap 23, and the magnetic force (magnetic flux) of the magnetic gap 23
becomes strong.
Therefore, in the example of FIG. 2 as well, it can be easily understood that the same function and
effect as the example of FIG. 1 can be obtained.
[0040]
In the example of FIG. 3, a wedge-shaped yoke 29 is used in place of the cylindrical yoke 28 in
FIG. 2.
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9
[0041]
That is, in the example of FIG. 3, the bottom of the flange 27b of the yoke 27 integrally formed
with the center pole 27a and the flange 27b is brought into contact with and fixed to the center
of the bottom 29a of the wedge-shaped yoke 29 having a predetermined size.
[0042]
The ring-shaped magnet 21 in which the N pole and the S pole are magnetized in the vertical
direction abuts on the flange 27 b of the yoke 27 on the flange 27 b of the yoke 27 integrally
formed with the center pole 27 a and the flange 27 b. Adhesively fix as follows.
In this case, the ring-shaped magnet 21 is positioned such that the center pole 27 a passes
through the ring-shaped magnet 21 and the magnet guide 27 c provided on the flange 27 b of
the yoke 27.
[0043]
A ring-shaped plate 22 is bonded and fixed onto the south pole of the ring-shaped magnet 21
and a magnetic gap 23 is formed between the inner peripheral surface of the plate 22 and the
outer peripheral surface of the center pole 27a.
[0044]
A ring-shaped magnet 24 having N and S poles magnetized in the vertical direction is adhered
and fixed onto the plate 22 so that the S pole abuts on the plate 22.
In this case, the ring-shaped magnet 21 and the ring-shaped magnet 24 are magnetized in
opposite directions.
[0045]
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A ring-shaped plate 25 is bonded and fixed onto the N pole of the ring-shaped magnet 24 and a
magnetic gap 26 is formed between the inner peripheral surface of the plate 25 and the outer
peripheral surface of the center pole 27a. The surface is brought into contact with the inner
peripheral surface of the upper end of the side wall 29 b of the wedge-shaped yoke 29.
The other components in FIG. 3 are the same as those in FIG.
[0046]
In the example of FIG. 3, the magnetic flux from the N pole of the ring magnet 21 is: N pole of the
ring magnet 21 → flange 27 b of the yoke 27 → center pole 27 a → magnetic gap 23 → plate 22
→ ring magnet 21 Magnetic circuit of S pole and N pole of ring magnet 21 → flange 27b of yoke
27 → bottom 29a of sidewall yoke 29 → side wall 29b → plate 25 → magnetic gap 26 → center
pole 27a → magnetic gap 23 → plate 22 → It flows in the magnetic circuit of the S pole of the
ring-shaped magnet 21.
[0047]
Further, the magnetic flux from the N pole of the ring magnet 24 is the N pole of the ring magnet
24 → plate 25 → magnetic gap 26 → center pole 27 a → magnetic gap 23 → plate 22 → S pole
magnetic circuit of the ring magnet 24 And the N pole of the ring magnet 24 → plate 25 → side
wall 29 b of the yoke 29 → bottom 29 a → flange 27 b of the yoke 27 → center pole 27 a →
magnetic gap 23 → plate 22 → magnet of S pole of the ring magnet 24 It flows with the circuit.
[0048]
Therefore, the magnetic flux in the same direction from the two ring-shaped magnets 21 and 24
flows in the magnetic gap 23, and the magnetic force (magnetic flux) of the magnetic gap 23
becomes strong.
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. 3.
[0049]
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11
In the example of FIG. 4, in the example of FIG. 1, the magnetic strength of the ring-shaped
magnet 24 is set to about half of the magnetic strength of the ring-shaped magnet 21.
The other components in FIG. 4 are the same as those in FIG.
[0050]
In the example shown in FIG. 4, in addition to the same function and effect as the example shown
in FIG. 1, the magnetic force of the ring magnet 21 is strong and the magnetic force of the ring
magnet 24 is relatively weak. The magnetic flux from the N pole of the magnet 21 is not only the
magnetic circuit described above, but also the N pole of the ring magnet 21 → bottom portion
20b of the wedge shaped yoke 20 → center pole 20 a → magnetic gap 26 → plate 25 → N pole
of the ring magnet 24 → S pole → plate 22 → flows through the magnetic circuit of the S pole of
the ring magnet 21 and the magnetic flux flowing into the magnetic gap 26 from the N pole of
the ring magnet 24 cancels out by this magnetic flux, and the magnetic flux of the magnetic gap
26 It becomes almost zero.
[0051]
Therefore, in the loudspeaker of FIG. 4, the magnetization of the frame 5 made of a magnetic
material fixed to the plate 25 forming the magnetic gap 26 is eliminated, and in the case of a
loudspeaker system using a small loudspeaker box, Even if the frame 5 of the speaker and other
devices are close to each other, the magnetism of the frame 5 is not present, so that the magnetic
shielding of the speaker system is facilitated.
[0052]
The present invention is not limited to the above-described example, and it goes without saying
that various other configurations can be adopted without departing from the scope of the present
invention.
[0053]
According to the present invention, the magnetic flux from each of the N poles of the first and
second ring magnets passes through the wedge shaped yoke and the first and second plates to
form the first and second magnetic fluxes. Since the magnetic circuit for returning to the
respective S poles of the ring-shaped magnet 2 is formed, a magnetically shielded speaker can be
obtained with a simple configuration that does not require a cancellation magnet or the like.
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[0054]
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 first and second ring magnets
flows in the same direction, the diaphragm is driven. The speaker device is capable of increasing
the magnetic force, improving the sensitivity and sound quality and reducing the resonance
sharpness Q at the lowest resonance frequency of the speaker bass, and expanding the bass
reproduction band when using a small speaker box. You can get it.
[0055]
In the present invention, when the magnetic strength of the second ring-shaped magnet is about
half of the magnetic strength of the first ring-shaped magnet, the magnetic flux flowing through
the second magnetic gap is substantially zero. It is possible to eliminate the magnetism of the
frame of the speaker fixed to the second plate.
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