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DESCRIPTION JP2000358296

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DESCRIPTION JP2000358296
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker and an improvement of the speaker device having a magnetic circuit capable of
increasing the magnetic flux density in the magnetic gap of the speaker and the speaker device.
[0002]
2. Description of the Related Art FIG. 10 shows a magnetically shielded speaker 10 which has
been widely used conventionally. The magnetic circuit of this magnetic shield type speaker 10
has a cylindrical center pole 3a at the central portion of a yoke 3 made of a substantially diskshaped metal, is integrated with the yoke 3, and has a cross section formed in a substantially
reverse T shape. ing. On the lower side of the yoke 3, a concentric second magnet 6 to be a
cancel magnet magnetized with S and N in the thickness direction is joined via an adhesive or the
like.
[0003]
On the yoke 3, the first magnet 1 which is magnetized concentrically with the second magnet 6
in the thickness direction and opposite to the second magnet 6 in the thickness direction is
joined with an adhesive. A plate 2 made of concentric metal is bonded to the magnet 1 with an
adhesive or the like, and a magnetic shield from the first magnet 6 to the plate 2 is surrounded
by a shield cover 7 made of a bottomed cylindrical metal. One pole (N pole) of the second magnet
6 and the outer peripheral portion of the plate 2 face each other to form a magnetic shield type.
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1
[0004]
A frame 5 pressed with metal or the like in a funnel shape is fixed by brazing to the upper side of
the plate 2, and the voice coil 8 is inserted in the magnetic gap 4 formed between the inner
diameter of the plate 2 and the outer diameter of the center pole 3 a The inner diameter of the
wound voice coil bobbin 9 is inserted into the outer diameter of the guide spacer inserted into
the center pole 3a, and the inner diameter of the concentric wave damper 14 inserted into the
middle position of the voice coil bobbin 9 is the outer diameter of the voice coil bobbin 9 By
bonding with an adhesive and bonding the outer diameter to the outer periphery of the bottom of
the frame 5, the voice coil 8 including the voice coil bobbin 9 is pivotally attached to the frame 5
so as to be vertically swingable.
[0005]
Furthermore, the inner diameter of the diaphragm 15 having a cone shaped fixed edge or free
edger 16 is joined to the upper end of the voice coil bobbin 9, and the outer periphery of the
edge 16 is joined to the largest opening of the frame 5 through the gasket 18 By joining the
upper opening of the coil bobbin 9 with a dome-shaped cap 17 for preventing dust intrusion, the
vibration system is pivotally attached to the frame 5 so as to be vertically swingable.
[0006]
According to the magnetically shielded speaker described in FIG. 10, the first and second
magnets 1 and 6 have two first effects due to the effects of leakage fluxes φL1 and φL2
generated between the outer diameter and the inner diameter of the first and second magnets.
The total magnetomotive force obtained by adding the second magnets 1 and 6 can not be
effectively used in the magnetic gap 4, and only about 1/3 of the total magnetomotive force can
be used.
That is, assuming that the magnetomotive force of one magnet is “1” in the magnetic circuit of
the magnetic shielding type, the magnetomotive force is not doubled even if the two magnets 1
and 6 are used, and there is also a relation that they are mutually joined in opposite polarity. The
magnetomotive force was only about 1.2.
[0007]
The present invention solves the above-mentioned problems, and the problem to be solved by the
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present invention is to interpose the plate or yoke made of magnetic material on the lower side
of the second magnet which is the cancel magnet, and the outer diameter of the magnet It is an
object of the present invention to provide a speaker and a speaker device capable of effectively
utilizing the total magnetomotive force by increasing the magnetomotive force and increasing the
magnetic flux density of the magnetic gap by about 10% by making the magnetomotive force
large enough.
[0008]
A speaker according to the present invention is a speaker having a magnetic circuit using first
and second magnets, wherein a plate made of a magnetic material larger than the outer diameter
of the first and second magnets is used. It is disposed on the upper and lower sides of the first
and second magnets, or at least one of them.
[0009]
The speaker device according to the present invention comprises a plate made of a magnetic
material larger than the outer diameter of the first and second magnets of the magnetic circuit
having the first and second magnets, above and below the first and second magnets, In the
speaker box, at least one of the speakers is provided in a speaker box.
[0010]
According to the speaker and the speaker device of the present invention, it is only necessary to
dispose a plate made of a magnetic material having a diameter sufficiently larger than the outer
diameter of the magnet on the upper and / or lower side of the first and second magnets. It is
possible to increase the magnetic flux density of the magnetic gap by about 10%.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION One embodiment of a loudspeaker according
to the present invention will be described in detail below with reference to FIGS.
FIG. 1 is a side sectional view of the speaker of the present invention, FIG. 2 is a side sectional
view of another speaker of the present invention, and FIGS. 3 and 4 are side sectional views of
still another speaker of the present invention.
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[0012]
FIGS. 1 to 4 constitute a magnetic circuit of the magnetic shield type as described in detail in FIG.
[0013]
In the magnetic circuit of the speaker 10 of FIG. 1, a cylindrical center pole 3a and a magnet
guide 3b formed of a stepped portion formed in a disc-like portion are integrated at the central
portion of a yoke 3 made of substantially disc-shaped pure iron or the like. The cross section is
configured in a substantially reverse T shape.
[0014]
The inner diameter portion of the first magnet 1 constituting the main magnet such as ringshaped ferrite is fitted on the yoke 3 into the magnet guide 3b of the yoke 3 and joined via an
adhesive.
[0015]
Next, a gap guide having a predetermined gap width is inserted into the center pole 3a, the inner
diameter of the ring-shaped first plate 2 is inserted into the outer diameter of the gap guide, and
the adhesive is interposed on the first magnet 1 Join.
[0016]
A frame 5 press-formed with a metal or the like in a funnel shape is fixed on the first plate by
brazing or the like.
[0017]
By magnetizing, for example, N, S in the thickness direction of the first magnet 1 in the
subassembly state described above, the yoke 3 side is magnetized to the S pole, and the first plate
2 side is magnetized to the N pole.
[0018]
Next, the second magnet 6 composed of a ring-shaped ferrite or the like to be a cancel magnet
having substantially the same diameter as the outer diameter φ M of the first magnet 1 and the
outer diameter φ M of the second magnet 6 sufficiently larger A disc or ring-shaped second
plate 11 having a diameter φ p is prepared.
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[0019]
The second plate 11 is made of a magnetic material having high permeability.
The second magnet 2 is bonded onto the second plate 6 with an adhesive, and the subassembly
of the magnetic circuit is assembled in the thickness direction of the second magnet 6 in the
same direction as the first magnet 1, for example, the second plate 11 side. Is the N pole, and the
magnet side is magnetized to the S pole.
[0020]
As described above, the second magnet 6 reversely magnetized is joined to the bottom surface of
the yoke 3 via an adhesive so that the yoke 3 has, for example, an S pole of the same polarity.
[0021]
The outer diameter of a guide spacer in which the inner diameter of a voice coil bobbin 9 in
which the voice coil 8 is wound in the magnetic gap 4 formed between the inner diameter of the
first plate 2 and the outer diameter of the center pole 3a The inside diameter of the corrugated
concentric damper 14 inserted in the middle position of the outside diameter of the voice coil
bobbin 9 is joined to the outside diameter of the voice coil bobbin 9 through an adhesive, and the
outside diameter is made around the bottom of the frame 5 By bonding, the voice coil 8 including
the voice coil bobbin 9 is pivotally attached to the frame 5 so as to freely swing in the vertical
direction.
[0022]
Furthermore, the inner diameter of the diaphragm 15 having a conical fixed edge or free edge 16
is joined to the upper end of the voice coil bobbin 9, and the outer periphery of the edge 16 is
joined to the largest opening of the frame 5 through the gasket 18, The vibration system is
pivotally pivotally connected to the frame 5 by connecting the upper opening of the coil bobbin 9
with a dome-shaped cap 17 for preventing dust intrusion.
[0023]
Assuming that the thickness of the first and second magnets 1 and 6 in the above configuration
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is T1, the diameter of the first and second plates 2 and 11 is φP, and the diameters of the first
and second magnets 1 and 6 The diameter difference 2D when .phi.M is 2D = .phi.P-.phi.M.
By selecting D at this time as D ≧ T1, it has become possible to increase the magnetic flux
density of the magnetic gap 4 by about 10%.
[0024]
In FIG. 1, the difference .PHI.P -.PHI.M = 2D / 2 = D between the diameter .PHI.M of the first and
second magnets 1 and 6 and the diameter .PHI.P of the first and second plates 2 and 11 and the
first and second Table 1 shows the magnetic flux density of the magnetic gap 4 when the
thickness T1 of the magnets 1 and 6 is compared with FIG. 1 and FIG. 10 of the conventional
example.
[0026]
According to the configuration of FIG. 1, the diameter φP of the first and second plates 2 and 11
is sufficiently larger than the diameter φM of the first and second magnets 1 and 6, and the first
and second Since the distance between the plates 2 and 11 of 2 and the distance TT = 2T1 + T2
is also sufficient, the leakage flux φL1 and φL2 are reduced as shown in Table 1 to increase the
magnetic flux density in the magnetic gap 4 by approximately 10%. There is.
[0027]
2 to 4 are substantially the same as the configuration of FIG. 1 and, in the description of the
present invention, the corresponding parts are denoted by the same reference numerals and
duplicate explanations are omitted.
[0028]
The speaker 10 of FIG. 2 encloses a shield cover 7 made of a cylindrical magnetic material or the
like with high permeability between the outer peripheries of the first and second plates 2 and 11.
Therefore, since the first and second plates 2 and 11 have the same polarity, the magnetic flux in
the shield cover 7 is repelled from each other, and the first and second magnets 1 and 6 Since
the distance D to the S pole is sufficiently large, the leakage flux φL1 does not occur as shown
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by the phantom line.
[0029]
3 and 4 have substantially the same structure as FIG. 2, and the shield cover 7 is formed of a
magnetic material of high permeability in a cylindrical shape with a bottom, and the bottom of
the shield cover 7 and the bottom of the second plate 11 are The cylindrical portion of the shield
cover 7 is extended to the outer periphery of the first plate 2 while being bonded via an adhesive.
[0030]
In FIG. 3, the extended cylindrical portion of the shield cover 7 is completely joined to the outer
periphery of the first plate 2 as in FIG. 2, and in the case of FIG. 4, the extended cylindrical
portion of the shield cover 7 is the first plate A sufficiently wide air gap G is provided on the
outer periphery of 2.
(Even the conventional magnetic shield type shown in FIG. 10 has a gap or about 0.5 mm.
)
[0031]
Further, in FIGS. 3 and 4, the second plate 11 is formed in a ring shape, and the diameter φP1 of
the inner diameter portion drilled at the center of the second plate 11 is larger than the diameter
φM1 of the inner diameter portion of the second magnet 6. Thus, the leakage flux φL2 between
the inner diameter between the yoke 3 and the second plate 11 is reduced.
[0032]
5 to 8 show still another embodiment of the present invention, in which FIG. 5 corresponds to
FIG. 1, FIG. 6 corresponds to FIG. 2, FIG. 7 corresponds to FIG. Since only the magnetic circuit is
different from FIGS. 1 to 4, only the magnetic circuits of FIGS. 5 to 8 will be collectively described
below.
[0033]
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In FIG. 5 to FIG. 8, the magnetic circuit used for the speaker of this example is of a magnetic
shield type.
That is, the inner diameter portion of the second magnet 6 constituting the cancel magnet which
is magnetized in a ring shape, for example, N, S in the thickness direction on the upper side of the
center pole 3a planted at the center of the discoid yoke 3 is the magnet guide 3b. And are joined
via an adhesive.
[0034]
In this case, the diameter .phi.Y of the disk portion of the yoke 3 is selected to be sufficiently
larger than the diameter .phi.M of the second magnet 6, and the thickness T1 of the second
magnet 6 is also selected larger.
[0035]
Further, the second plate 11 formed in a ring shape on the upper surface of the second magnet 6
is bonded with an adhesive.
In this case, a gap guide is inserted into the center pole 3 a so that the inner diameter of the
second plate 11 and the outer diameter of the center pole 3 a become the dimension gap of the
predetermined magnetic gap 4.
[0036]
The outer diameter of the second plate 11 is selected to be smaller than the outer diameter of the
second magnet 6.
[0037]
On the second plate 11, the ring-shaped first magnet 1 magnetized, for example, with S and N is
bonded opposite to the second magnet 6 as the main magnet via an adhesive in the thickness
direction.
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[0038]
Next, a ring-shaped first plate 2 having substantially the same diameter as the outer diameter of
the yoke 3 is bonded to the upper surface of the first magnet 1 via an adhesive.
[0039]
A frame 5 pressed with a funnel-shaped metal or the like is fixed to the upper side of the plate 2
by brazing or the like, and a vibration system similar to that of FIGS.
[0040]
According to the speaker 10 having the magnetic circuit of the above-described configuration,
the N pole of the second magnet 6 passes through the second plate 11 and the magnetic gap 4
and the yoke 3 to the second magnet 6 via the center pole 3a. Magnetic flux between the center
pole 3a and the center pole 3a through the first magnetic flux φ1 flowing in the magnetic path
leading to the south pole, the north pole of the first magnet 1, the second plate 11 and the
magnetic gap 4 And the magnetic flux φ 2 flowing in the magnetic path leading to the S pole of
the first magnet 1 via the first plate 2, the utilization efficiency in the magnetic gap 4 of the
conventional external magnet is first and second The magnetic flux density of the magnetic gap 4
is increased and the driving force of the diaphragm is approximately doubled, compared with the
case where it is not used about 1/3 of the total magnetomotive force of the magnets 1 and 2
What can be done is obtained .
[0041]
The difference between the diameters .phi.M of the first and second magnets 1 and 6 and the
diameters .phi.Y of the first plate 2 and the yoke 3 in FIG. 5 .phi.Y -.phi.M = 2D / 2 = D and the
first and second magnets 1 And 6 have the same magnetic circuit as in FIG. 1 and FIG. 1, and the
magnetic flux density of the magnetic gap 4 when compared with the speaker in the case where
the diameters of the first and second plates are small is shown in Table 2 Shown in.
[0043]
According to the configuration of FIG. 5, the diameter .phi.Y of the first plate 2 and the yoke 3 is
sufficiently larger than the diameters of the first and second magnets 1 and 6, and the first plate
2 and the yoke 3 are provided. Since there is also sufficient space between the spacing TT = 2T1
+ T2, the magnetic flux density at the magnetic gap 4 is increased to 10% by reducing the
leakage flux φL1.
[0044]
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In the case of FIG. 6, the outer periphery of the first plate and yoke of FIG. 5 is surrounded
between the first plate 2 and the yoke 3 by the same cylindrical shield cover 7 as in FIG. Since
the first plate 2 and the yoke are surrounded so as to abut or face each other by the bottomed
cylindrical shield cover 7 similarly to FIGS. 3 and 4, duplicate explanation is omitted.
[0045]
According to the speaker 10 having the configuration of FIGS. 6 and 7, not only the magnetic
shield type configuration is possible, but also the magnetic flux density passing through the
magnetic gap 4 can be further enhanced as compared with the case of FIG.
[0046]
That is, in addition to the magnetic fluxes φ1 and φ2 described in FIG. 5, the magnetic flux
emitted from the N pole of the second magnet 6 → → second plate 11 → magnetic gap 4 →
downward to the center pole 3a → yoke 3 → The magnetic flux φ3 passing through the
magnetic path from the shield cover 7 → the first plate 2 → the S pole of the first magnet 1 and
the magnetic flux emitted from the N pole of the first magnet 1 → → the second plate 11 →
magnetic gap 4 → upward of the center pole 3 a → magnetic gap between the center pole 3 a
and the first plate 2 → first plate 2 → shield cover 7 → yoke 3 → magnetic flux passing through
the magnetic path of S pole of the second magnet 6 The magnetic flux in the magnetic gap 4 is
further increased by φ4 or the like.
[0047]
In the configuration of FIG. 8, since the gap G between the inner periphery of the cylindrical
portion of the shield cover 7 and the first plate 2 is sufficiently large, the magnetic flux density at
the magnetic gap 4 is almost the same as FIG. It becomes possible to set it as ten.
[0048]
In FIG. 9, a duct 23 having a duct opening 23a is provided in a normal box-shaped speaker box
21, a speaker sound emission hole 22a is formed in the baffle board 22 of the speaker box 21,
and the speaker sound emission hole 22a is opposed to the figure. The speaker 10 described in
detail in 4 is fixed.
[0049]
According to the speaker device of this configuration, the magnetomotive force in the magnetic
gap 4 can be increased simply by enlarging the yoke or the first or second plate, and a speaker
which can expand the low range can be obtained in the small speaker.
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[0050]
According to the loudspeaker and the loudspeaker apparatus of the present invention, the
following effects can be obtained.
(1) According to the present invention, the leakage flux on the outer periphery of the magnet can
be reduced simply by providing the second plate made of a magnetic material or the like having a
sufficiently larger diameter than the second magnet under the second magnet constituting the
cancel magnet. A speaker and a speaker device capable of reducing the magnetomotive force of
the magnetic gap by 10% or more can be obtained.
(2) According to the present invention, only by providing a yoke sufficiently larger than the
diameter of the second magnet below the second magnet constituting the cancel magnet, the
leakage flux on the outer periphery of the magnet is reduced, and generation of the magnetic gap
A speaker and a speaker device capable of increasing the magnetic force by 10% or more can be
obtained.
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