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DESCRIPTION JP2001008289

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DESCRIPTION JP2001008289
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
magnetic circuit and a speaker suitable for low and high frequencies, and more particularly to a
magnetic circuit and a speaker in which the magnetic flux density of the magnetic gap is
increased to improve directivity.
[0002]
2. Description of the Related Art Conventionally, as a magnetic circuit used for a small-sized
speaker, a magnetic cancellation type magnet is used to increase the magnetic flux density of a
magnetic gap where a voice coil is pivotally pivoted, The applicant has proposed a magnetic
circuit in which the driving force is approximately twice that of a conventional magnetic circuit
using one magnet.
[0003]
FIG. 9 is a side sectional view of the main part of the magnetic circuit described above.
In FIG. 9, 1 is a yoke made of a substantially disc-shaped metal, has a cylindrical center pole 2 at
the central portion of the disc, is integrated with the yoke 1, and has a substantially inverted Tshaped cross section. It is done. A concentric first magnet 3 to be a cancel magnet magnetized
with S and N in the thickness direction is joined onto the yoke 1 with an adhesive or the like.
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[0004]
A first plate 4 made of concentric metal is bonded onto the first magnet 3 with an adhesive or
the like, and the first magnet 3 is formed concentrically in the thickness direction to be a second
main magnet. The second magnet 5 magnetized with N and S in the thickness direction is bonded
to the first plate 4 with an adhesive, and a second plate made of concentric metal is formed on
the second magnet 5 6 is joined with an adhesive or the like to construct a magnetic circuit.
[0005]
In the magnetic gap 9 formed between the inner diameter of the first plate 4 and the outer
diameter of the center pole 2 by such a magnetic circuit, it is pivotally pivoted up and down by a
frame or the like via a diaphragm. The voice coil 8 wound around the worn voice coil bobbin 7 is
interposed, and an acoustic signal is supplied to the voice coil 8 to drive the diaphragm.
[0006]
According to the magnetic circuit of the above-mentioned configuration, S of the first plate 4 to S
of the first magnet 3 passes through the magnetic gap 9 from the N pole of the first magnet 3
through the yoke 1 and the center pole 2. The magnetic gap 9 is formed via the first magnetic
flux φ 1 flowing in the magnetic path leading to the pole, the magnetic pole between the second
plate 6 and the center pole 2 from the N pole of the second magnet 5 and the center pole 2. The
utilization efficiency in the magnetic gap 9 of the conventional external magnet type magnet is
determined by the magnetic flux φ2 flowing in the magnetic path from the first plate 4 to the S
pole of the second magnet 2 through the first and second What can increase the magnetic flux
density of the magnetic gap 9 and approximately double the driving force of the diaphragm as
compared to the case where only about 1/3 of the total magnetomotive force of the magnets 3
and 5 is used It is obtained.
[0007]
Furthermore, a core-xixel type speaker in which a high-pitched speaker is coaxially disposed on
the front surface of the bass diaphragm by using an external magnet type magnetic circuit is
widely used.
[0008]
SUMMARY OF THE INVENTION Since the magnetic circuit and the speaker of the conventional
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configuration described above are of the external magnetic type, the diameter of the inner
diameter of the first and second magnets 3 and 5 is small. It can not be a center pole 2 with a
larger diameter.
Therefore, when a small diameter magnet is used, a voice coil with a large diameter can not be
used, so the magnetic flux density of the magnetic gap 9 can not be increased, and the driving
force of the diaphragm is limited.
[0009]
Also, in an external magnet type magnetic circuit, the amplitude is generally determined by the
movement of the diaphragm depending on the thickness of the magnet, and in the case of a thin
small magnet, the amplitude of the diaphragm can not be increased, so a large input is applied to
the speaker In order to achieve this, the height direction and width of the magnetic circuit
become large, and the speaker as a whole becomes large.
[0010]
Also, even if this magnet is made to act on the magnetic gaps 9 of a plurality of center pole parts
to increase the magnetic flux density in the magnetic gaps of the magnet, the external magnetic
type magnetic circuit is effective in providing in the magnetic path. For the magnetic gap (9 in
FIG. 9) to be operated, the magnetic gap is formed in the magnetic flux φ 2 between the outer
diameter of the center pole 2 and the inner diameter of the second plate 6, The magnetomotive
force of the magnet could not be used effectively.
[0011]
Further, when selecting the directional characteristics, it is specified as a core-xial type, and the
reproduction band can be expanded when the high-tone speaker is held by an arm or the like, but
the sound quality is affected by the reflection of the arm or the like. There was a problem of
deterioration.
[0012]
The present invention is intended to solve the above-mentioned problems, and by using at least
one magnet in the magnetic circuit, the magnetic flux density of the magnetic gap 9 is increased,
and the driving force of the diaphragm is increased by the magnetic shielding type. It is an object
of the present invention to provide a magnetic circuit and a speaker which can prevent the
deterioration of the sound quality due to the reflection of an arm or the like by being not made
coaxial.
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[0013]
SUMMARY OF THE INVENTION The magnetic circuit of the present invention comprises a plate
having a plurality of projecting portions of different lengths serving as pole piece portions, and
either the right side or the left side of the plate or any of these left and right sides A magnet
disposed in one side and magnetized in a thickness direction, and first and second semicircular
grooves serving as a plurality of magnetic gaps surrounding a plate and a magnet and facing a
plurality of protrusions serving as a pole piece And the yoke of the
[0014]
The speaker according to the present invention is provided with a plate having a plurality of
projecting portions having different lengths to be a pole piece, and is disposed on the left and
right sides of the plate or on either the left or right side to magnetize in the thickness direction A
magnetic circuit comprising a first magnet and a second yoke having a magnet and a plurality of
semicircular grooves serving as a plurality of magnetic gaps surrounding a plate and a magnet
and facing a plurality of protrusions serving as pole pieces; A vibration system including a
plurality of voice coils is pivotally pivotally mounted in a plurality of magnetic gaps formed by a
plurality of projections and through holes formed in the first and second yokes.
[0015]
According to the magnetic circuit of the present invention and the speaker using this magnetic
circuit, the magnetic flux of the small-sized magnet is concentrated in a plurality of magnetic
gaps, the utilization factor of the effective magnetic flux of the magnet is increased, and the
magnetomotive force is Not only can it be expanded to about 5 times, but there is no need to
insert a center pole within the inner diameter of the magnet, so it is not influenced by the inner
diameter of the magnet, and multiple voice coil diameters and center pole diameters should be
selected. Can.
Furthermore, since the width of the magnetic circuit can be reduced, the speaker and the speaker
apparatus including the speaker box on which the speaker is mounted can be downsized, and the
directivity characteristic can be improved.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION One embodiment of a magnetic circuit and a
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speaker according to the present invention will be described below with reference to FIGS.
[0017]
FIG. 1 is a perspective view showing the assembled state of the magnetic circuit used for the
speaker of the present invention, FIG. 2 is an explanatory view of the magnetic circuit of the
present invention, FIG. 3 is an explanatory view of another magnetic circuit of the present
invention, 5 is a plan view and a side sectional view of the speaker according to the present
invention, FIG. 6 is a perspective view of a voice coil used in the present invention, and FIG. 7 is a
connection diagram of the voice coil according to the present invention. FIG. 8 is a side sectional
view of the speaker device of the present invention.
[0018]
Hereinafter, one embodiment of the magnetic circuit of the speaker used in the present invention
will be described with reference to FIG.
[0019]
In FIG. 1, the magnetic circuit 10 of this embodiment comprises one plate 11, two first and
second magnets 12a and 12b, and two first and second yokes 13a and 13b. There is.
[0020]
The plate 11 can be made of a substantially disk-shaped metal with high magnetic permeability,
and the first and second from the outer periphery of the plate 11 in the direction of 45.degree.
The first protrusions 14a and 14b are extended, and the first protrusions 14a are long and small,
and the disk-like portions serving as pole pieces 15a for high-pitched or super-high-pitched (20
kHz or more) are the first projecting portions. It is bent at a right angle at the tip of 14a.
[0021]
Similarly, the second protrusion 14b is short, and a disk-like portion to be a pole piece 15b for
large bass or low / mid tone is bent at a right angle at the end of the second protrusion 14b.
[0022]
These projecting portions 14a and 14b are, as shown in FIG. 1, the disk-like portion bent as
described above, without making the pole piece 15a or 15b itself a center pole and a tip end on
the bending portion. The first and second small diameter and large diameter disk-like pole pieces
15a and 15b of magnetic metal may be fixed by spot welding or brazing.
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[0023]
A through hole 16 may be formed concentrically in the center of the disk-like plate 11 if
necessary.
[0024]
As shown in the side cross sectional view of FIG. 2B, one side of the front side of the plate 11 has
a diameter larger than the diameter of the plate 11 and is the same as the inside diameter of the
through hole 16 of the plate 11 , Concentrically having a small inner diameter and N.V. By
joining the first magnet 12a magnetized S to the first magnet 12a with an adhesive or the like,
the magnetic flux leaking from the N pole of the first magnet through the inner diameter into the
plate 11 on the opposite side is reduced.
[0025]
Next, the back side of the plate 11 has the same shape as the first magnet 12a, and the S.V. A
concentric second magnet 12b magnetized with N is bonded via an adhesive.
[0026]
First and second yokes 13a and 13b are yokes on the other side of the first and second magnets
12a and 12b having the first and second magnets 12a and 12b joined to both sides of the plate
11, respectively. Through the adhesive.
[0027]
The first and second yokes 13a and 13b are substantially box-shaped, and convex steps 13c and
13d are formed on the top plate, and the top plate and step 13c of the first and second yokes
13a and 13b are formed. The semicircular through holes 17a and 17b, and 17c and 17d are
formed in the top plate of and 13d.
The semicircular through holes 17a and 17b and 17c and 17d have an annular shape when the
first and second yokes 13a and 13b are overlapped, and the diameter of the through holes
formed by overlapping these is the first of the plates 11 And the diameter of the first and second
pole pieces 15a and 15b formed on the second protrusions 24a and 24b.
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[0028]
Furthermore, when the first and second yokes 13a and 13b are joined so that the semicircular
through holes 17a and 17b and 17c and 17d form a perfect circle, the respective first and
second The distance D between the insides of the yokes 13a and 13b is chosen to be equal to the
sum of the first and second magnets 12a and 12b and the thickness D1 + D1 + D2 of the plate
11, respectively.
[0029]
When joining the first and second yokes 13a and 13b to the magnetic circuit in which the first
and second magnets 12a and 12b and the plate 11 are integrated, the first and second pole
pieces 15a and 15b are used. A semicircular transmission formed when the gap guide is inserted
into 15b and the outer diameters of the first and second pole pieces 15a and 15b and the first
and second yokes 13a and 13b are joined together. The first and second magnetic gaps 18a and
18b (see FIG. 2A) formed between the circular inner diameters formed by the holes 17a and 17c
and 17b and 17d (see FIG. 2A) are held at predetermined intervals. Be
[0030]
FIG. 2C is a side sectional view of the magnetic circuit assembled as described above, cut from
the front side of the plate 11. The inside of the first and second magnetic gaps 18a and 18b is
shown in FIG. The voice coils 21a and 21b wound respectively on the high or low tone voice coil
bobbin 20a and the low-pitch voice coil bobbin 20b, which will be described later, move up and
down with respect to the first and second yokes 13a and 13b via vibration systems. It is adapted
to be pivotally mounted in a direction.
[0031]
FIGS. 3 (A), (B), (C) and FIGS. 4 (A), (B), (C) show other structures of this example similar to FIGS.
2 (A), (B) and (C). 3 (A) and 4 (A) are plan views of the magnetic circuit, and FIGS. 3 (C) and 4 (C)
are FIGS. 3 (A) and 4 (A). FIG. 3 (B) and FIG. 4 (B) are sectional views taken along line B-B in FIG.
3 (C) and FIG. 4 (C).
[0032]
The difference between FIGS. 3 (A), (B), (C) and FIGS. 4 (A), (B) (C) and FIGS. 2 (A), (B) and (C) is
the ring shape used in the magnetic circuit 10. Since it is completely the same as FIG. 2 except
the point which made the magnet into one, the same part number is attached | subjected to a
corresponding part and duplication description is abbreviate | omitted.
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[0033]
FIGS. 3A, 3B and 3C show the case where only one second magnet 12b is provided between the
second yoke 13b and the plate 11, and FIGS. C) shows the case where only one first magnet 12a
is disposed between the first yoke 13a and the plate 11.
[0034]
In the magnetic circuit detailed in FIG. 2, as shown in FIG. 2B, the magnetic fluxes φ1 and φ2
and φ3 and φ4 emitted from the N pole of the first and second magnets 12a and 12b are the
first and the second. It concentrates on the first and second magnetic gaps 18a and 18b through
the two yokes 13a and 13b, and it is generated between the center pole 2 and the second plate 6
in this magnetic path as shown in FIG. The magnetic force (electromotive force) of the two
magnets 12a and 12b can be effectively extracted because there is no magnetic gap, and the first
and second magnetic gaps are actually compared with the magnetic circuit of the configuration
of FIG. It has become possible to increase the magnetic flux density of 18a and 18b by about 2.5
times.
Furthermore, a magnetic shielding effect is also obtained.
[0035]
Also in the case of the magnetic circuit using only one first or second magnet 12a or 12b
described with reference to FIGS. 3 and 4, the magnetic fluxes φ1, φ2,. The magnetic flux is
concentrated on the first and second magnetic gaps 18a and 18b by .phi.3 and .phi.4, and the
magnetic densities of the first and second magnetic gaps 18a and 18b are shown in FIG. It was
possible to increase to almost equal values.
[0036]
One embodiment of a speaker using the above-described magnetic circuit will be described with
reference to FIGS. 5 to 7. FIG.
[0037]
In FIG. 5, the frame 25 of the loudspeaker used in this example is formed substantially in a
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funnel shape and made of metal, and the bottom of the frame 25 is matched to the steps 13c and
13d formed on the top plate of the magnetic circuit 10. A projecting step 25a is formed.
Further, through holes 25b and 25c into which the voice coil bobbin 20a for high or ultra high
sound and the voice coil bobbin 20b for low or low to middle sound can be inserted are formed
at the bottom of the step portion 25a and the frame 25.
[0038]
In the present embodiment, as shown in FIG. 5, the first magnetic gap 18a is formed above the
second magnetic gap 18b, and the first magnetic gap 18a and the second magnetic gap 18b are
formed. And so as to be parallel to each other.
[0039]
A speaker frame 25 is attached to the upper surfaces of the first and second yokes 13a and 13b,
and an outer peripheral portion of a main diaphragm 26 made of cone paper provided with an
edge 28 on the outer peripheral portion of the frame 25 It is held by the gasket 27.
[0040]
A voice coil bobbin 20b for low or medium noise is attached to the inner peripheral portion of
the main diaphragm 26, and the voice coil 21b is wound around the voice coil bobbin 20b and
the voice coil 21b is inserted into the magnetic gap 18b. Hold by the damper 29 as shown in FIG.
Reference numeral 34 denotes a dustproof cap.
[0041]
At the inclined portion of the main diaphragm 26, a ring-shaped edge 30 having a corrugated
corrugation for high or ultra high sound at the time of paper making of the diaphragm 26 is
simultaneously formed.
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The edge 28 of the main diaphragm 26 may be either a fixed edge or a free edge.
[0042]
At the center of the edge 30, a through hole 31 into which the high sound voice coil bobbin 20b
can be inserted is formed.
A high sound diaphragm 32 which is also used as a cap is provided at the upper opening of the
voice coil bobbin 20b.
For example, lightweight high-rigidity cone paper is used as the high-tone diaphragm 32.
[0043]
The voice coil bobbin 21a is wound around the voice coil bobbin 20a and inserted into the
magnetic gap 18a.
The voice coil for high-pitched voice in which the voice coil 21a is wound around the voice coil
bobbin 20a has been described above. For example, as shown in FIG. 6, the voice coil bobbin 20a
has a cylindrical conductive plate such as an aluminum thin plate. The voice coil bobbin 20a is
used as a voice coil of one turn, and the input terminals 20d and 20e are provided on the voice
coil bobbin 20a also serving as the voice coil of this one turn, and between the input terminals
20d and 20e. It may be a voice coil for an ultra high tone speaker capable of emitting an ultra
high tone of 20 kH or more so as to supply an acoustic signal.
[0044]
In the case of a voice coil for super high sound, the first magnetic gap 18a is, for example, only
inserted with a voice coil 21a of one turn of aluminum thin plate, so that the gap width can be
made smaller. The power of can be made stronger.
[0045]
The voice coil bobbin 20a is pivotally held by the spiral damper 33 joined to the step 25a of the
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frame 25, and the voice coil 20a is held at a central position in the first magnetic gap 18a.
[0046]
Further, for example, two input terminals 35 are provided at predetermined positions of the
frame 25, and acoustic signals from these input terminals 35 are passed through the tinsel wire
36, and a voice of one turn serving as the voice coil 21a and the voice coil bobbin 20a. It supplies
to coil 21a grade | etc.,.
In this case, since the resistance value of the voice coil 20a of one turn is extremely small in this
example, as shown in FIG. 7, the voice coil 21a of one turn is connected in series to the voice coil
21b for bass or low / mid tone. The acoustic signal 38 is supplied to the series circuit of the voice
coils 21a and 21b.
In this case, a high-pass capacitor 37 may be connected in parallel to the voice coil 21b and
supplied to the voice coil 21a so that only one input terminal 35 is provided.
[0047]
Thus, according to the present embodiment, the magnetic flux from the respective N poles of the
ring-shaped first and second magnets or at least one of the magnets 12a and 12b is the plate 11
and the first and second magnets. The magnetic circuit is configured to return to the respective S
poles of the first and second magnets 12a and 12b through the plurality of first and second
magnetic gaps 18a and 18b through the yokes 13a and 13b. By the configuration, the magnetic
flux density of the magnetic gaps 18a and 18b is increased, and a magnetic shield type speaker
can be obtained.
[0048]
Further, according to this embodiment, since the high-tone diaphragm 32 is provided on the
inclined portion of the main diaphragm 26, the main diaphragm 26 and the high-tone diaphragm
32 are different from the coaxial type speaker, and the main diaphragm There is no arm or the
like for supporting the high-tone diaphragm 32 in front of 26. It is possible to obtain a speaker of
a wide reproduction band capable of reproducing to a super high band with good high band
characteristics and directivity characteristics.
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[0049]
FIG. 8 shows an example of a phase-reversal speaker apparatus in which a speaker of a wide
reproduction band capable of reproducing to a super high band of good high frequency
characteristics and directivity characteristics as shown in FIG. 5 is attached to a small speaker
box 40. Show.
Referring to FIG. 8, in FIG. 8, the speaker sound emission hole 42 formed in the baffle plate 41
provided on the front surface of the speaker box 40 formed into a substantially rectangular box
shape by ABS resin etc. Fix the speaker as shown in.
[0050]
Further, an acoustic signal from the input terminal 43 provided at a predetermined position
outside the speaker box 40 is supplied to the input terminal 35 of the speaker via the connection
line 45, and the acoustic signal from the input terminal 35 is a tinsel thread. The voice coils 21a
and 21b are supplied through the wire 36.
[0051]
Further, a duct 46 having an opening 45 in the same plane as the speaker sound emission hole
42 of the baffle plate 41 is provided, and the sound from the back of the main diaphragm 26 of
the speaker and the high sound diaphragm 32 is the opening of the duct 46 From 45, it radiates
to the front of the speaker device.
[0052]
In this case, the phase of the sound emitted from the back of the main diaphragm 26 of the
speaker is inverted and radiated from the duct 46 to the outside of the speaker box 40 and the
sound emitted from the front of the main diaphragm 26 I try to expand the low range.
[0053]
According to the speaker apparatus of the present embodiment, it is possible to obtain a smallsized speaker apparatus having a wide reproduction band which can reproduce the super high
frequency band with good sound and directional characteristics.
[0054]
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As described above, according to the magnetic circuit and the speaker of the present invention,
the plate and the yoke are joined to both sides of the magnet, and the two magnetically
assembled and subassembled magnetic circuits are made to face each other. Since the magnetic
circuit for the speaker is completed by joining the yoke to one magnetic circuit in which the plate
and the yoke are joined to both surfaces of the magnet, a magnetic circuit and a speaker
excellent in mass productivity can be obtained.
[0055]
Further, since the entire configuration of the magnetic circuit can be made thin, it is possible to
extend the use application to an elliptical type speaker or the like.
[0056]
Furthermore, since the magnetic flux of the magnet is concentrated in a plurality of magnetic
gaps and the magnet is magnetized in the opposite direction sandwiching the plate, the magnetic
leakage of the magnetic circuit is very small, and the magnetic flux density of the magnetic gap
Magnetic force is about 2.5 and becomes very strong, and there is no need to insert a center pole
into the inner diameter of the magnet to create a magnetic gap, so the diameter of the voice coil
bobbin is arbitrary regardless of the inner diameter of the magnet The size of the
Further, the length of the center pole can be set regardless of the thickness of the magnet, and
the allowable input of the small speaker can be increased by increasing the amplitude of the
diaphragm.
Furthermore, since a plurality of vibration systems can be easily made in one magnetic circuit,
the directivity characteristic of the speaker can be arbitrarily selected, the influence of the arm
by the coaxial type can be avoided, and the magnetic circuit and speaker with improved
directivity can be obtained. can get.
[0057]
According to the present invention, the configuration of the magnetic circuit is extremely simple,
and (1) a plurality of magnetic gaps can be formed.
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(2) The assembly of the magnetic circuit is easy and the mass productivity is excellent.
(3) The magnetic flux density of the magnetic gap portion can be increased to make it thin.
(4) Any number of magnetic gaps can be designed depending on the purpose of use, and
directivity characteristics can be freely selected.
(5) The voice coil diameter can be set arbitrarily and the amplitude can be increased.
(6) Since the high-tone diaphragm is provided at the inclined portion of the main diaphragm,
there is nothing in front of the main diaphragm and the high-tone diaphragm, and the highfrequency characteristics and directivity characteristics of the ultra-high range are reproduced It
is possible to obtain a wide reproduction band speaker that can be used.
[0058]
Brief description of the drawings
[0059]
1 is a perspective view showing an assembled state of the magnetic circuit of the present
invention.
[0060]
2 is an explanatory view of a magnetic circuit of the present invention.
[0061]
3 is an explanatory view of another magnetic circuit of the present invention.
[0062]
4 is an explanatory view of another magnetic circuit of the present invention.
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[0063]
5 is a plan and a side sectional view of the speaker of the present invention.
[0064]
6 is a perspective view of a voice coil used in the present invention.
[0065]
7 is a connection diagram of the voice coil of the present invention.
[0066]
8 is a side sectional view of the speaker device of the present invention.
[0067]
9 is a side sectional view of the conventional magnetic circuit.
[0068]
Explanation of sign
[0069]
10. Magnetic circuit 11. Plates 12a and 12b First and second magnets 13a and 13b First and
second yokes 14a and 14b First and second protrusions , 15a, 15b... First and second pole pieces
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