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DESCRIPTION JP2008011043

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DESCRIPTION JP2008011043
To provide an assembly jig for assembling a magnetic circuit having a plurality of magnets
divided in a circumferential direction with high accuracy simply and easily. An inner
circumferential portion 21b is formed in contact with an outer periphery 14c of a magnet 14
(14a) divided into a plurality of magnetic circuits 10, and the magnet 14 (14a) is formed on a
plate 15 or a yoke 13. A guide jig 21 (ring jig) positioned at a prescribed position, and an outer
periphery 14c of the magnet 14 (14a) divided into a plurality of parts are formed on the inner
peripheral portion 21b of the guide jig 21 (ring jig). First, using the assembly jig 2 having
magnetic attraction means (adsorption magnet 21m) to be attracted by magnetic force, a step of
causing the magnet 14 (14a) to be attracted to the inner periphery of the guide jig 21 by the
adsorption magnet 21m; Positioning and fixing (14a) to the plate 15 or the yoke 13. [Selected
figure] Figure 4
Assembly jig for magnetic circuit for speaker, and method for manufacturing magnetic circuit for
speaker
[0001]
The present invention relates to an assembly jig for a speaker magnetic circuit, and a method of
manufacturing a speaker magnetic circuit.
[0002]
A typical loudspeaker comprises, for example, a magnetic circuit in which permanent magnets
and plates are arranged on a yoke.
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A voice coil is vibratably supported by a diaphragm and a voice coil bobbin in the magnetic gap
of the magnetic circuit.
[0003]
Patent Document 1 discloses a magnetic circuit in which a disk or annular permanent magnet is
divided into a plurality of magnets in the circumferential direction in order to improve the
magnetic characteristics of the magnet of the magnetic circuit. Moreover, manufacturing cost can
be reduced by assembling a plurality of magnets and forming a disk or annular permanent
magnet.
[0004]
JP 2005-311449 A
[0005]
In the magnetic circuit described above, it is important to position and fix the divided magnets
with high accuracy to the plate or the yoke during the assembly process.
If this assembly accuracy is relatively low, problems such as non-uniform magnetic gap and nonuniform distribution of magnetic flux may occur. If such a problem occurs, the sound quality of
the reproduced sound may be degraded.
[0006]
The present invention takes an example of the problem to address such a problem. That is, an
assembly jig which assembles a magnetic circuit provided with a plurality of circumferentially
divided magnets easily with high precision, and a magnetic circuit provided with a plurality of
circumferentially divided magnets easily with high accuracy And the like are objects of the
present invention.
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[0007]
In order to achieve such an object, the present invention at least comprises the configurations
according to the following independent claims.
[0008]
The invention according to claim 1 is an assembly jig for a speaker magnetic circuit including a
yoke, a plate, and a ring-shaped or disk-shaped magnet divided into a plurality of pieces in the
circumferential direction. And a ring-shaped jig for positioning the magnet at a prescribed
position with respect to the plate or the yoke, and having a shape in contact with the outer
periphery of the plurality of divided magnets of the magnetic circuit. And a magnetic attraction
means for attracting the outer periphery of the magnet divided into pieces to the inner periphery
of the ring-like jig by magnetic force.
[0009]
The invention according to claim 5 is a method of manufacturing a speaker magnetic circuit
including a yoke, a plate, and a ring-shaped or disk-shaped magnet divided into a plurality of
pieces in the circumferential direction, the speaker magnetic circuit The assembly jig of the
magnetic circuit is formed in a shape in which the inner peripheral portion is in contact with the
outer periphery of the plurality of divided magnets of the magnetic circuit, and the magnet is
placed at a prescribed position with respect to the plate or the yoke. A ring-shaped jig for
positioning, and magnetic attraction means for attracting the outer circumference of the plurality
of divided magnets to the inner circumference of the ring-shaped jig by magnetic force, and the
plurality of divided magnets are The step of allowing the magnetic attraction means to adsorb on
the inner periphery of the ring jig of the assembly jig, and the front of the magnet in a state in
which the magnet is attracted to the inner periphery of the ring jig Characterized by a step for
positioning and fixing the plate or yoke.
[0010]
An assembly jig for a speaker magnetic circuit according to an embodiment of the present
invention includes a yoke, a plate, and a ring-shaped or disk-shaped magnet divided into a
plurality of pieces in the circumferential direction. An assembly jig, wherein an inner peripheral
portion is formed in contact with an outer periphery of a magnet divided into a plurality of
magnetic circuits, and a ring shape which positions the magnet at a prescribed position with
respect to a plate or yoke A jig and magnetic attraction means for attracting the outer
circumference of a plurality of divided magnets to the inner circumference of a ring-like jig by a
magnetic force.
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[0011]
Preferably, the magnetic attraction means is formed at a prescribed interval along the
circumferential direction in the vicinity of the inner peripheral portion or the inner peripheral
portion of the ring-shaped jig, and a position corresponding to the magnet divided into a plurality
of magnetic circuits. The present invention is characterized by having the same number of
adsorption magnets as the divided magnets.
[0012]
Preferably, the magnetic attraction means is formed on the inner peripheral portion or the inner
peripheral portion of the ring-shaped jig, and the magnet of the magnetic circuit divided into a
plurality of unmagnetized parts is the ring-shaped jig. It has the adsorption magnet which
adsorbs to the inner circumference of the above.
[0013]
In addition, preferably, a ring-shaped jig and a convex or concave regulating portion for
restricting the ring-shaped jig to a prescribed position with respect to the plate or the yoke while
the plate or the yoke of the magnetic circuit is fitted. It has a base jig formed.
[0014]
Further, in the method of manufacturing a speaker magnetic circuit according to an embodiment
of the present invention, a magnet divided into a plurality of pieces using the above-described
speaker magnetic circuit assembly jig is a ring jig of the assembly jig. The process includes: on
the inner periphery, a step of attracting by a magnetic attraction means; and a step of positioning
and fixing the magnet on a plate or a yoke in a state where the magnet is attracted to the inner
periphery of the ring jig.
[0015]
By using the above-mentioned assembly jig for the speaker magnetic circuit, the outer periphery
of the magnet divided into a plurality of magnetic circuits is attracted to the inner periphery of
the ring-like jig by the magnetic attraction means, and the magnetism is obtained. The magnet of
the circuit can be positioned and fixed in a defined position relative to the plate or yoke.
That is, the magnetic circuit provided with the magnet divided into plural pieces in the
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circumferential direction can be easily assembled with high accuracy.
[0016]
Further, the magnetic attraction means is formed at a prescribed interval along the
circumferential direction in the vicinity of the inner circumferential portion or the inner
circumferential portion of the ring-shaped jig, and at a position corresponding to the magnet
divided into a plurality of magnetic circuits Since the same number of adsorption magnets as the
divided magnets are provided, the magnet of the magnetic circuit can be positioned and fixed
with high accuracy by an assembly jig of a simple configuration in which a plurality of
magnetized magnets are formed in a ring-shaped jig. Magnetic circuits can be assembled.
[0017]
Further, the magnetic attraction means is formed on the inner peripheral portion or the inner
peripheral portion of the ring jig, and the magnet of the magnetic circuit divided into a plurality
of unmagnetized parts is taken as the inner periphery of the ring jig. The magnet of the magnetic
circuit can be positioned and fixed with high accuracy by the adsorption magnet formed on the
inner peripheral portion or the vicinity of the inner peripheral portion of the ring-shaped jig.
[0018]
In addition, the ring jig can be restricted to a prescribed position with respect to the plate or yoke
by the restriction portion of the base jig, so that the plurality of divided magnets of the magnetic
circuit can be easily compared with the plate or yoke. Positioning can be fixed at a prescribed
position.
[0019]
Also, after the magnet of the unmagnetized magnetic circuit is assembled by the assembling jig to
produce the speaker magnetic circuit, the unmagnetized magnet is magnetized, so for example,
when the magnetized magnet is assembled In comparison, the magnetic circuit can be assembled
with high accuracy.
[0020]
Hereinafter, an embodiment of the present invention will be described with reference to the
drawings.
[0021]
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[Speaker Device 1] FIG. 1 is a view for explaining a speaker device according to an embodiment
of the present invention.
1 (A) is a cross-sectional view of the speaker device 1, and FIG. 1 (B) is a top view for explaining a
magnet of a magnetic circuit of the speaker device 1 shown in FIG. 1 (A).
FIG. 2 is a perspective view showing a magnet of the magnetic circuit shown in FIG. 1 (B).
[0022]
The speaker device (speaker) 1 according to the present embodiment has a magnetic circuit 10
including a ring-shaped or disk-shaped magnet 14 divided into a plurality of pieces in the
circumferential direction.
The magnetic circuit 10 may be of an inner magnet type or an outer magnet type.
In the present embodiment, a loudspeaker 1 provided with an external magnet type magnetic
circuit provided with a ring-shaped (ring-shaped) magnet 14 will be described.
[0023]
Specifically, as shown in FIGS. 1 (A) and 1 (B), the speaker 1 is formed on the outer peripheral
side of the center pole portion 11 and the center pole portion 11 formed in the central portion,
and radially outward A yoke 13 having a flange portion 12 extended toward the end, a ringshaped magnet 14 mounted on the flange portion 12 of the yoke 13, and a ring-shaped plate 15
mounted on the magnet 14; Have.
A magnetic circuit 10 is formed by the yoke 13, the magnet 14 and the plate 15.
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The magnetic circuit 10 corresponds to an embodiment of the magnetic circuit according to the
present invention.
[0024]
In the magnetic circuit 10, a magnetic gap 10 g is formed between the inner periphery of the
plate 15 and the side surface of the center pole portion 11 of the yoke 13.
The yoke 13 and the plate 15 are made of, for example, a metal material such as iron.
The magnet 14 is formed of, for example, a permanent magnet such as a neodymium-based,
samarium-cobalt-based, alnico-based, or ferrite-based magnet.
As a forming material of the yoke 13 and the plate 15, for example, a metal such as iron or a
magnetic material can be adopted.
[0025]
Further, in the magnetic circuit 10 according to the present embodiment, the yoke 13, the
magnet 14, and the plate 15 are formed concentrically with respect to the central axis, and in
detail, they are coaxially located at overlapping positions along the central axis direction. It is
arranged close.
[0026]
[Magnet 14 of Magnetic Circuit 10] The magnet 14 is divided into a plurality of magnets 14a
along the circumferential direction, as shown in FIGS. 1 (A), 1 (B), and 2.
The magnet 14 which concerns on this embodiment is divided | segmented into 12 magnets
along the circumferential direction, as shown to FIG. 1 (A) and FIG. 1 (B).
For example, the magnet 14 according to the present invention is composed of a plurality of
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divided magnets 14a as compared with a general ring magnet which is not divided, and the
manufacturing cost of the individual magnets 14a is relatively low. By assembling, the
manufacturing cost of the entire magnet 14 can be reduced.
[0027]
Specifically, as shown in FIG. 1 (B) and FIG. 2, the magnet 14a is formed in a substantially arc
shape, and one side is formed with parallel side surfaces along the radial direction, and the other
side is formed. Is formed with a notch 14A.
Further, a soundproof packing 14P made of, for example, a resin or the like is attached and fixed
to the notch portion 14A according to the present embodiment by an adhesive or the like.
The soundproof packing 14P reduces unnecessary noise due to the magnetic circuit 10 when the
speaker is driven.
[0028]
Further, as shown in FIG. 1B and FIG. 2, the magnets 14 according to the present embodiment
are formed by alternately arranging the magnets 141 and the magnets 142. The split magnet
141 is formed in a shape that matches the shape of the split magnet 142 when turned upside
down. By assembling the magnets 141 and 142 configured as described above, the
manufacturing cost can be further reduced.
[0029]
Further, as shown in FIG. 1A, the speaker 1 has a frame 16, a diaphragm 17, a voice coil bobbin
portion 172, an edge portion 18, a voice coil portion 19, and a damper 176 as vibration system
members.
[0030]
As shown in FIG. 1A, the frame 16 is formed in a cone shape in which the magnetic circuit 10 is
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disposed at the center and which is open toward the acoustic radiation side.
A diaphragm 17 is fixed to the end of the frame 16 with an adhesive or the like via an edge
portion 18. Further, an outer peripheral portion of the damper 176 is fixed to a substantially
central step portion of the frame 16 by an adhesive or the like. The frame 16 is made of, for
example, various materials such as a resin material and a metal material.
[0031]
The diaphragm 17 is vibratably fixed to the frame 16 via the edge portion 18 as shown in FIG. 1
(A). The diaphragm 17 according to the present embodiment is, as shown in FIG. 1A, formed on
the outer peripheral side of the dome-shaped central diaphragm 171 having a convex shape
toward the acoustic radiation side and the central diaphragm 171. And a ring-shaped outerperipheral-side diaphragm portion 173 which is formed on the inner peripheral side of the
diaphragm 17 and has a convex or straight radial sectional shape toward the acoustic radiation
side. As a forming material of the diaphragm 17, for example, various materials such as polymer,
such as resin, paper, metal, etc. can be adopted. In the present embodiment, the central
diaphragm portion 171 and the outer peripheral side diaphragm portion 173 are integrally
formed.
[0032]
In addition, a voice coil bobbin portion 172 is formed at the junction of the central diaphragm
portion 171 and the outer peripheral side diaphragm portion 173, and the voice coil portion 19
is wound around the voice coil bobbin portion 172. Although the voice coil bobbin portion 172
according to the present embodiment is formed in a tubular shape, the present invention is not
limited to this. For example, a voice coil bobbin portion 172 having a U-shaped cross section may
be provided between the central diaphragm portion 171 and the outer peripheral side diaphragm
portion 173.
[0033]
The edge portion 18 is formed in a ring shape, for example, as shown in FIG. As the edge part 18,
various edges, such as a roll edge, a V-shaped edge, a corrugation edge, a flat edge, etc., are
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employable, for example. A roll edge is employed as the edge portion 18 according to the present
embodiment. The edge portion 18 has appropriate compliance and rigidity, and is connected to
the diaphragm 17 by fixing the inner peripheral edge of the edge portion 18 to the outer
peripheral edge of the diaphragm 17 with an adhesive or the like. Further, as described above,
the outer peripheral edge of the edge portion 18 is connected to the frame 16 by being fixed to
the frame 16.
[0034]
The voice coil unit 19 is formed by, for example, winding an electric wire around a cylindrical
voice coil bobbin unit 172, is fixed to the voice coil bobbin unit 172, and is disposed in the
magnetic gap 10g of the magnetic circuit 10 The vibrator 172 and the diaphragm 17 are
disposed so as to be able to vibrate with respect to the frame 16 and the magnetic circuit 10. The
voice coil unit 19 is electrically connected to, for example, a terminal unit (not shown) via a
conductive wire.
[0035]
The damper 176 elastically supports the voice coil bobbin portion 172 and the like at a
predetermined position of the speaker 1 when the speaker 1 is not driven, and the voice coil
bobbin portion 172 and the voice coil portion 19 disposed in the magnetic gap 10 g Resilient
holding is performed at a position where it does not contact the portion that constitutes 10. As
shown in detail in FIG. 1A, the damper 176 has an inner peripheral portion fixed to the voice coil
bobbin portion 172 and an outer peripheral portion fixed to the central step of the frame 16.
[0036]
Although the speaker 1 which concerns on the said embodiment has the damper 176, it is not
restricted to this form. For example, the speaker 1 may be provided with a damper 176 as
needed. Moreover, the vibration system member of the speaker 1 is not limited to the
embodiment described above.
[0037]
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10
In the speaker 1 of the above configuration, when an electrical signal including a sound signal is
input to the voice coil unit 19 from a terminal unit (not shown) via a conductive wire, for
example, the magnetic field by the magnetic circuit 10 and the voice coil unit 19 The
electromagnetic interaction with the flowing current generates an electromagnetic force along
the vibration direction (axial direction), and the voice coil unit 19 vibrates along the vibration
direction (axial direction). The vibration by the voice coil unit 19 is transmitted to the diaphragm
17 via the voice coil bobbin unit 172, and the diaphragm 17 vibrates.
[0038]
[Assembly Jig 2 of Speaker Magnetic Circuit 10] FIG. 3 is an exploded perspective view for
explaining the assembly jig of the magnetic circuit of the speaker device shown in FIG. FIG. 4 is a
perspective view for explaining an assembly process of the magnetic circuit 10 by the assembly
jig 2 according to the embodiment of the present invention.
[0039]
Next, an assembly jig 2 for assembling the magnetic circuit 10 of the speaker 1 configured as
described above will be described with reference to the drawings.
[0040]
The assembly jig 2 of the speaker magnetic circuit 10 positions and fixes the plurality of divided
magnets 14 along the circumferential direction of the magnetic circuit 10 having the abovedescribed configuration at a prescribed position with respect to the plate 15 or the yoke 13.
The assembly jig 2 according to the present embodiment positions and fixes the divided magnets
14 with respect to the plate 15 at a prescribed position.
[0041]
In detail, the assembly jig 2 which concerns on this embodiment has the guide jig 21 and the
base jig 22, as shown to FIG. 3, FIG. The guide jig 21 corresponds to an embodiment of the ring-
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shaped jig according to the present invention, and the base jig 22 corresponds to an embodiment
of the base jig 22 according to the present invention.
[0042]
As shown in FIGS. 3 and 4, the guide jig 21 is formed in a ring shape, and the inner peripheral
portion 21b is in contact with the outer periphery 14c of the magnet 14 (14a) divided into a
plurality of magnetic circuits 10. While being formed, the magnet 14 is positioned at a
prescribed position with respect to the plate 15. In detail, the guide jig 21 has an inner
circumferential portion 21 b having an inner diameter substantially equal to the outer diameter
of the ring-shaped magnet 14. The guide jig 21 is made of, for example, various materials such as
resin and metal.
[0043]
Further, the ring-shaped guide jig 21 is formed with magnetic attraction means for attracting the
outer periphery 14c of the plurality of divided magnets 14 (14a) to the inner periphery of the
guide jig 21 by magnetic force.
[0044]
For example, as shown in FIGS. 3 and 4, the magnetic attraction means is formed in the vicinity
of the inner peripheral portion 21 or the inner peripheral portion of the ring-shaped guide jig 21
and is divided into a plurality of unmagnetized portions. It is possible to employ an adsorption
magnet 21m that adsorbs the magnet 14 (14a) of the magnetic circuit 10 to the inner periphery
of the guide jig 21.
[0045]
Specifically, as the magnetic attraction means, as shown in FIG. 3 and FIG. 4, it is formed at a
prescribed interval along the circumferential direction in the vicinity of the inner peripheral
portion 21 b or the inner peripheral portion of the ring-shaped guide jig 21. The same number of
adsorption magnets 21m as the divided magnets 14 (14a) are provided at positions
corresponding to the plurality of divided magnets 14 (14a) of the magnetic circuit 10.
[0046]
As shown in FIG. 3 and FIG. 4, the adsorption magnet 21 m is formed in a plate shape,
specifically, a small disk shape or a column shape, and the guide magnet of the adsorption
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magnet 21 m has a ring-shaped guide The guide jig 21 is provided so as to coincide with the
radial direction of the tool 21.
[0047]
More specifically, the adsorption magnet 21 m is formed at a prescribed interval along the
circumferential direction in the vicinity of the inner peripheral portion of the ring-shaped guide
jig 21, and the magnet 14 divided into a plurality of magnetic circuits 10 ( It is disposed in a
recess 21a formed at a position corresponding to 14a).
[0048]
The guide jig 21m may be fixed, for example, with an adhesive or the like to the inner peripheral
portion or the vicinity of the inner peripheral portion of the guide jig 21.
[0049]
Further, as shown in FIGS. 3 and 4, a cover member 21A for preventing the detachment of the
adsorption magnet 21m may be provided.
The cover member 21A is formed in a ring shape, and is fixed on the ring-shaped guide jig 21 by
a fixing member such as an adhesive or a screw so as to cover the recess of the recess 21a in
which the adsorption magnet 21m is disposed. .
That is, the guide jig 21 and the cover member 21A are integrally formed.
[0050]
As shown in FIG. 3 and FIG. 4, the base jig 22 engages the ring-shaped guide jig 21 and the plate
15 or the yoke 13 of the magnetic circuit 10, and the ring 15 with respect to the plate 15 or the
yoke 13 A convex or concave restricting portion 220 which restricts the guide jig 21 in the shape
of a circle to a predetermined position is formed.
The base jig 22 according to the present embodiment regulates the ring-shaped guide jig 21 with
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13
respect to the plate 15 at a prescribed position.
The base jig 22 is made of, for example, various materials such as resin and metal.
[0051]
Specifically, as shown in FIGS. 3 and 4, the base jig 22 has a flat plate portion, specifically, a flat
plate portion 221 having a disk shape, and a convex shape protruding to one surface side of the
flat plate portion 221. The control unit 220 is provided.
In the present embodiment, as shown in FIG. 3 and FIG. 4, a convex shaped restricting portion
220 is formed along the outer peripheral edge of the circular flat portion 221.
The restricting portion 220 is formed in a stepped shape, and specifically includes a first fitting
portion 222 in which the plate 15 is fitted, and a second fitting portion 223 in which the guide
jig 21 is fitted. The first fitting portion 222 and the second fitting portion 223 are integrally
formed concentrically.
[0052]
The first fitting portion 222 has an inner peripheral portion 222b formed in the same shape as
the outer periphery of the plate 15. Specifically, the first fitting portion 222 has a circular shape
so that the inner diameter of the first fitting portion 222 matches the outer diameter of the plate
15. Is formed.
[0053]
The second fitting portion 223 is formed on the first fitting portion 222, and the inner peripheral
portion 223b is formed in the same shape as the outer periphery of the guide jig 21. Specifically,
the inner diameter of the second fitting portion 223 is , And is formed in a circular shape so as to
match the outer diameter of the guide jig 21.
[0054]
At the time of assembly, the plate 15 is placed on the flat plate portion 221 of the base jig 22,
and the plate 15 is fitted to the first fitting portion 222, and the guide jig 21 is placed on the
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plate 15. When the guide jig 21 is fitted to the second fitting portion 223, the regulating portion
220 regulates the ring-shaped guide jig 21 with respect to the plate 15 to a prescribed position.
[0055]
Further, as shown in FIGS. 3 and 4, in the base jig 22 according to the present embodiment, a
notch portion 224 is formed in a part of the outer peripheral portion.
The notch portion 224 is used when removing the plate 15, the guide jig 21 and the like from
the base jig 22.
[0056]
[Method of Manufacturing Magnetic Circuit 10] FIG. 5 is a cross-sectional view of the assembly
jig, the magnet of the magnetic circuit, and the plate shown in FIG.
Specifically, FIG. 5 (A) is a cross-sectional view showing the assembly jig and the magnet 14
(14a) of the magnetic circuit before assembly, and FIG. 5 (B) shows the guide jig 2 and plate 15
during assembly. It is sectional drawing which shows 14 (14a).
FIG. 6 is a top view showing the assembly jig, the magnet 14 (14a) and the plate 15 at the time of
assembly shown in FIG. 5 (B). FIG. 7 is a perspective view showing the assembly jig, the magnet
14 (14a), and the plate 15 (15a) at the time of assembly shown in FIG. 5 (B).
[0057]
A method of manufacturing the magnetic circuit 10 according to the embodiment of the present
invention using the assembly jig 2 configured as described above will be described with
reference to FIGS. 4 to 7.
[0058]
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15
In the present embodiment, an adhesion enhancer (primer) is applied to the magnet 14 (14a) in
advance and dried.
Further, in the present embodiment, the magnet 14a is not magnetized.
[0059]
Next, as shown in FIGS. 4 to 7, the ring-shaped plate 15 is placed on the flat plate portion 221 of
the base jig 22, and the plate 15 is fitted to the first fitting portion 222 of the regulating portion
220. Match.
[0060]
Next, the guide jig 21 is placed on the plate 15, and the guide jig 21 is fitted to the second fitting
portion 223 of the regulating portion 220.
[0061]
Next, as shown in FIGS. 4 to 7, a plurality of unmagnetized magnets 14 (14 a) are mounted in a
ring shape on the plate 15 with an adhesive or the like, and a ring-shaped guide jig Arrange
along the inner circumference of 21.
The adsorption magnet 21 m formed in the guide jig 21 causes the outer periphery of the
unmagnetized magnet 14 (14 a) to be attracted to the inner peripheral portion 21 b of the ringshaped guide jig 21 by magnetic force.
[0062]
More specifically, each of the plurality of adsorption magnets 21m formed in the vicinity of the
inner peripheral portion of the ring-shaped guide jig 21 is a ring-shaped guide for each of the
magnets 14 (14a) divided into a plurality of unmagnetized pieces. Positioning is performed on
the inner periphery of the jig 21.
[0063]
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16
In the present embodiment, as shown in FIGS. 5A and 5B to FIG. 7, a ring in which a plurality of
holes 15 h formed in the plate 15 at equal intervals along the circumferential direction is formed
in the plate 15. The magnet 14 (14a) is positioned with respect to the plate 15 so as to be visible
from the notch 14A of the magnet 14 in the shape of a circle.
At this time, for example, in a state where the pin-shaped member 15p is disposed in the hole
15h formed in the plate 15, positioning in the circumferential direction is easily performed by
disposing the magnet 14 (14a) on the plate 15. be able to.
The hole 15 h of the plate 15 may be used, for example, when positioning and fixing the plate 15
and the yoke 13 at the time of assembly of the magnetic circuit 10.
[0064]
Next, as shown in FIGS. 5A and 5B, the ring-shaped weight jig 23 is disposed on the magnet 14
(14a), and the space between the magnet 14 (14a) and the plate 15 is obtained. The adhesive is
solidified or cured to fix the magnet 14 and the plate 15. The time during which the adhesive
solidifies or hardens can be hardened, that is, the magnet 14 can be positioned and fixed at a
specified position with high accuracy with respect to the plate 15.
[0065]
Comparative Example FIG. 8 is a perspective view for explaining a guide jig 21J of a comparative
example.
[0066]
For example, as shown in FIG. 8, an unmagnetized magnet 14 (14 a) is disposed on the plate 15
using a ring-shaped guide jig 21 J not equipped with an adsorption magnet, and an
unmagnetized magnet 14 is used. Even if the outer periphery of (14a) is disposed in contact with
the inner periphery of the guide jig 21J, if external force or vibration is applied to the assembly
jig or the like due to any factor, the magnet 14 (14a) can be the plate 15 or the guide jig It
deviates from the specified position with respect to 21J.
[0067]
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17
In addition, since the magnets 14 (14a) and the like generally have dimensional tolerances, in
order to position the magnets 14 (14a) with high accuracy with respect to the plate 15, the
magnets 14 (14a) of the non-magnetized magnets are reliably made. It is important to arrange
the outer periphery so as to be in contact with the inner periphery of the guide jig 21J.
However, when assembling using the ring-shaped guide jig 21J not provided with the adsorption
magnet shown in FIG. 8, the positioning error is relatively large.
[0068]
[Invention] On the other hand, as described above, in the assembly jig 2 according to the present
invention, as shown in FIGS. 3 to 7, a ring-shaped guide jig 21 having an adsorption magnet 21m
is used.
That is, when the unmagnetized magnet 14 (14 a) is disposed on the plate 15 and the outer
periphery of the unmagnetized magnet 14 (14 a) is in contact with the inner periphery of the
guide jig 21 according to the present invention, Positioning and fixing can be performed so that
the unmagnetized magnet 14 (14 a) can be reliably brought into contact with the inner periphery
of the guide jig 21 by the magnetic force of the adsorption magnet 21 m.
[0069]
Also, even if external force or vibration is applied to the assembly jig due to some factor, the
unmagnetized magnet 14 (14a) is attracted to the inner periphery of the guide jig 21 by the
magnetic force of the adsorption magnet 21m. It is possible to reduce the deviation from the
specified position of the magnet 14 (14a).
[0070]
Further, even when the magnet 14 (14a) has a dimensional tolerance, the unmagnetized magnet
14 (14a) is attracted to the inner periphery of the guide jig 21 by the magnetic force of the
adsorption magnet 21m. (14a) can be positioned and fixed to the plate 15 with high accuracy.
[0071]
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FIG. 9 is a diagram for explaining the method of manufacturing the speaker 1.
9 (A) is a cross-sectional view for explaining the step of placing the plate 15 and the magnet 14
(14a) on the yoke 13, and FIG. 9 (B) is a cross sectional view of the magnetic circuit 10 at the
time of assembly. FIG. 9 (C) is a cross-sectional view for explaining an assembling process of the
magnetic circuit 10 and the vibration system member.
[0072]
Next, in a state where the ring-shaped magnet 14 (14a) and the plate 15 are fixed by the abovementioned manufacturing process, as shown in FIGS. 9A and 9B, the central hole of the magnet
14 and the plate 15 The center pole portion 11 of the yoke 13 is fitted, and the magnet 14 is
placed on the flange portion 12.
At this time, the magnet 14 and the flange portion 12 are fixed by fixing the magnet 14 and the
flange portion 12 with an adhesive or the like. At this time, in order to make the magnetic gap
10g formed between the inner periphery of the plate 15 and the outer surface of the center pole
portion 11 uniform, a cylindrical jig is fitted between the magnetic gaps 10g for positioning You
may
[0073]
The speaker magnetic circuit 10 is manufactured by the above-described manufacturing process
as shown in FIG. The magnet 14 of the magnetic circuit 10 manufactured by the above
manufacturing process is in an unmagnetized state.
[0074]
Next, the magnet 14 of the magnetic circuit 10 shown in FIG. 9B is magnetized by a magnetizing
device (not shown). In the present embodiment, the ring-shaped magnet 14 is magnetized, for
example, along the axial direction (the vibration direction of the diaphragm). In detail, for
example, a magnetic field of about three to five times the coercive force of the magnet 14 is
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applied by a magnetizing device.
[0075]
Next, as shown in FIG. 9C, vibration system members such as the diaphragm 17, the voice coil
bobbin portion 172, the voice coil portion 19, the edge portion 18, the frame 16 and the damper
176 are assembled and prepared by a prescribed manufacturing method. The vibration system
member and the magnetic circuit 10 are assembled. In detail, the frame 16 is disposed on the
plate 15 with an adhesive or the like so that the voice coil portion 19 is disposed at the specified
position of the magnetic gap 10g of the magnetic circuit 10, and the vibration system member
and the magnetic circuit 10 are provided. And assemble. After a predetermined time, the
adhesive between the plate 15 and the frame 16 solidifies or cures, and the speaker 1 is
completed as shown in FIGS. 1 (A) and 1 (B).
[0076]
FIG. 10 is a diagram for explaining the magnetization direction of the magnet 14 of the speaker
magnetic circuit 10. FIG. 10 (A) is a perspective view for explaining the magnet magnetized along
the central axis direction of the magnet, and FIG. 10 (B) is a cross-sectional view of the magnet
shown in FIG. 10 (A), FIG. 10C is a perspective view for explaining the magnet magnetized in the
radial direction.
[0077]
In the above embodiment, as shown in FIGS. 10A and 10B, magnetization is performed along the
central axis direction of the ring-shaped magnet 14 with respect to the unmagnetized magnet 14
at the time of assembly. Not limited to this form. For example, according to the structure of the
magnetic circuit of the speaker device, as shown in FIG. 10C, magnetization may be performed
along the radial direction (radial direction) of the magnet 14.
[0078]
FIG. 11 is a view for explaining one specific example of the assembly jig according to the present
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invention. FIG. 11A is a view for explaining an assembly jig according to the first specific
example. FIG. 11B is a view for explaining an assembly jig according to a second specific
example. FIG. 11C is a view for explaining an assembly jig according to a third specific example.
Next, modifications of the assembly jig will be described with reference to FIGS. 11 (A) to 11 (C).
[0079]
As shown in FIG. 11A, the guide jig 21B according to the first specific example is formed by
arranging a plurality of arc-shaped adsorption magnets 211m in a circular shape. The adsorption
magnet 211 m may be formed on the entire ring-shaped guide jig 21 B, or may be formed on the
inner circumferential portion or in the vicinity of the inner circumferential portion.
[0080]
Further, as shown in FIG. 11B, in the guide jig 21B according to the second specific example, the
polarities of the adjacent adsorption magnets 211m are opposite to each other as compared with
the guide jig 21B shown in FIG. 11A. It is formed. Moreover, the polarity of the adsorption
magnet 211m is not limited to this form. For example, the polarity of each adsorption magnet
211m may be appropriately set in any direction.
[0081]
Further, as shown in FIG. 11C, a guide jig 21C according to the third specific example has a ringshaped adsorptive magnet 213m in the vicinity of the inner peripheral portion or the inner
peripheral portion of the ring-shaped jig. For example, in the guide jig 21 shown in FIG. 3, it is
necessary to arrange the adsorption magnet 21 m at a position corresponding to the
arrangement position of the plurality of divided magnets 14 (14 a) of the magnetic circuit 10. In
the guide jig 21C shown in the above, it is not necessary to perform the alignment along the
circumferential direction, so that the assembly time can be shortened.
[0082]
The present invention is not limited to the embodiments described above. For example, the
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21
speaker and the magnetic circuit according to the present invention may be manufactured by
combining the embodiment and the specific example described above.
[0083]
Moreover, in the embodiment described above, the diaphragm 17 has the dome-shaped central
diaphragm 171 and the outer peripheral diaphragm 173, but the present invention is not limited
to this. Various shapes can be adopted as the diaphragm 17.
[0084]
Moreover, as the speaker 1, various shapes, such as a cone-shaped speaker and a dome-shaped
speaker, are employable. In addition, the damper 176 and the edge portion 18 may not be
provided as the speaker 1.
[0085]
Further, in the embodiment described above, the magnet 14 (14a) is divided into a plurality of,
for example, 12 pieces along the circumferential direction, but the present invention is not
limited to this form. The division number of the magnet 14 can be set as appropriate.
[0086]
In the embodiment described above, after the magnet 14 and the plate 15 which are not
magnetized are assembled to the yoke 13, the magnetization is performed, but the present
invention is not limited to this embodiment. For example, the magnetic circuit 10 may be
assembled using a magnet 14 (14a) magnetized in advance. In this case, the suction magnet 21m
of the guide jig 21 is formed on the guide jig 21 so that the magnetization direction of the
suction magnet 21m is equal to the magnetization direction of the magnet 14 (14a) of the
magnetic circuit 10.
[0087]
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22
Further, in the embodiment described above, the speaker 1 has the external magnet type
magnetic circuit 10, but the present invention is not limited to this.
[0088]
FIG. 12 is a cross-sectional view for explaining a speaker provided with an internal magnet type
magnetic circuit.
Specifically, FIG. 12A is a cross-sectional view for explaining a speaker 1E provided with an
internal magnetic type magnetic circuit 10E, and FIG. 12B is a sectional view of the internal
magnetic type magnetic circuit 10E shown in FIG. It is a top view of magnet 14E (14e).
[0089]
For example, as shown in FIGS. 12 (A) and 12 (B), the speaker 1E may be provided with an
internal magnet type magnetic circuit 10E. The magnetic circuit 10E has a yoke 13E, a ringshaped magnet 14E, and a ring-shaped plate 15E. The ring-shaped magnet 14E is divided into a
plurality of magnets 14e along the circumferential direction. In the case of positioning and fixing
the divided magnet 14e having the above-described configuration at the prescribed position with
respect to the plate 15E or the yoke 13E, the assembly jig 2 according to the present invention
may be used to assemble.
[0090]
Further, in the above embodiment, after the magnet 14 of the magnetic circuit 10 divided into
plural pieces along the circumferential direction is positioned and fixed on the plate 15 using the
assembly jig 2, the magnet 14 and the plate 15 Although the magnetic circuit 10 according to
the present invention is manufactured by assembling the yoke 13, the present invention is not
limited to this form. For example, after positioning and fixing the magnets 14 of the magnetic
circuit 10 divided into plural pieces along the circumferential direction on the yoke 13 using the
assembly jig 2, assembling the magnet 14 and the yoke 13 and the plate 15 Thus, the magnetic
circuit 10 according to the present invention may be manufactured.
12-04-2019
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[0091]
Further, in the method of manufacturing the speaker magnetic circuit 10 according to the
present embodiment, the outer periphery 14c of the magnet 14 (14a) is positioned and fixed in
contact with the inner peripheral portion 21b of the ring-shaped guide jig 21. The magnet 14
(14c) is attracted to the inner periphery of the ring-shaped guide jig 21 by the magnetic
attraction magnet 21m formed in the inner peripheral portion 21b or the inner peripheral
portion 21 of the inner ring 21 by magnetic force. Absent.
[0092]
For example, a ring-shaped guide jig having a shape in contact with the outer periphery is
provided on the inner periphery of the ring-shaped magnet 14 (14a) divided into a plurality of
pieces in the circumferential direction, and the outer periphery of the guide jig or the vicinity of
the outer periphery You may employ the assembly jig of a structure which provides an
adsorption magnet.
[0093]
As described above, in the method of manufacturing the speaker magnetic circuit 10 according
to the present invention, the inner peripheral portion 21b is formed in contact with the outer
periphery 14c of the magnet 14 (14a) divided into a plurality of magnetic circuits 10. And a
guide jig 21 (ring jig) for positioning the magnet 14 (14a) at a prescribed position relative to the
plate 15 or the yoke 13, and an outer periphery 14c of the magnet 14 (14a) divided into a
plurality of pieces. First, the magnet 14 is divided into a plurality of pieces by using the assembly
jig 2 having a magnetic attraction means (adsorption magnet 21m) for attracting the magnetic
flux to the inner peripheral portion 21b of the guide jig 21 (ring jig) by magnetic force. (14a) is
attracted to the inner periphery of the ring-shaped guide jig 21 of the assembly jig 2 by the
adsorption magnet 21m, and the inner periphery of the guide jig 21 is And a step of positioning
and fixing the magnet 14 (14a) on the plate 15 or the yoke 13 in a state where the 14 (14a) is
attracted, a magnetic circuit including the magnet 14 (14a) divided in plural in the
circumferential direction 10 can be easily assembled with high precision.
[0094]
Further, the magnetic attraction means is formed at a prescribed interval along the
circumferential direction in the vicinity of the inner circumferential portion 21 b or the inner
circumferential portion of the ring-shaped guide jig 21, and the magnet 14 divided into a
plurality of magnetic circuits 10. Since the same number of adsorption magnets 21m as the
divided magnets 14 (14a) are provided at the positions corresponding to (14a), the magnets 14
(14a) of the magnetic circuit 10 can be highly precisely by the assembly jig 2 having a simple
configuration. And the magnetic circuit 10 can be assembled.
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[0095]
That is, since the guide jig 21 has the adsorption magnet 21m magnetized in the same number
and angle as the magnet 14 (14a) of the magnetic circuit 10, the magnet 14 (14a) is attracted to
the guide jig 21 and assembled. It is possible to prevent the magnet 14 (14a) from being
displaced to the inner peripheral side, and it is possible to assemble the magnet 14 uniformly in a
circular shape.
[0096]
In addition, the magnetic attraction means is formed in the vicinity of the inner circumferential
portion 21b or the inner circumferential portion of the ring-shaped guide jig 21, and the magnet
14 (14a) of the magnetic circuit 10 divided into a plurality of unmagnetized magnets. Since the
adsorbing magnet is attracted to the inner peripheral portion 21b of the ring-shaped guide jig
21, the magnetic circuit can be performed with higher accuracy than the adsorptive magnet 21m
formed on the inner peripheral portion of the ring-shaped jig or in the vicinity of the inner
peripheral portion. Ten magnets 14 (14a) can be positioned and fixed.
[0097]
Further, the ring-shaped guide jig 21 can be regulated to a prescribed position with respect to
the plate 15 or the yoke 13 by the regulating portion 220 of the base jig 22, and the plurality of
divided magnets of the magnetic circuit 10 can be easily simplified. The 14 (14a) can be
positioned and fixed at a prescribed position with respect to the plate 15 or the yoke 13a.
[0098]
In addition, after the magnet 14 (magnet 14a) of the unmagnetized magnetic circuit 10 is
assembled with the assembly jig 2 to produce the speaker magnetic circuit 10, the magnet 14
(magnet 14a) is magnetized. Since this is performed, it is possible to assemble the magnetic
circuit 10 with high accuracy as compared to, for example, assembling a magnetized magnet.
[0099]
Further, since the guide jig 21 includes the adsorption magnet 21m, the guide jig 21m can be
easily removed after the magnetic circuit 10 is assembled.
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That is, for example, as the assembly jig of the comparative example, the type in which the
magnets 14a divided in plural along the circumferential direction are positioned and fixed with
an adhesive or screw, the type in which the magnets 14a are sandwiched and positioned and
fixed, the magnets 14a are spread In the present invention, the magnet 14a can be easily
disposed at a prescribed position, and the assembly jig 2 can be easily removed after the magnet
14a is positioned and fixed to the plate 15 or the like, as compared with the type etc. .
In the assembly jig 2, the movable portion is relatively excellent in durability.
[0100]
In addition to the magnet 14 (14a) of the magnetic circuit 10, the ring-shaped guide jig
according to the present invention can obtain the same effect as that of the embodiment if it is a
substance (iron material) that can be adsorbed by the adsorption magnet 21m.
[0101]
It is a figure for demonstrating the speaker apparatus which concerns on one Embodiment of this
invention.
(A) is a cross-sectional view of the speaker device 1, and (B) is a top view for explaining a magnet
of a magnetic circuit of the speaker device 1 shown in (A).
It is a perspective view which shows the magnet of the magnetic circuit shown to FIG. 1 (B).
It is a disassembled perspective view for demonstrating the assembly jig of the magnetic circuit
of the speaker apparatus shown in FIG.
It is a perspective view for demonstrating the assembly process of the magnetic circuit 10 by the
assembly jig 2 which concerns on one Embodiment of this invention.
It is sectional drawing of the assembly jig shown in FIG. 4, the magnet of a magnetic circuit, and a
plate.
12-04-2019
26
Specifically, (A) is a cross-sectional view showing the assembly jig before assembly and the
magnet 14 (14a) of the magnetic circuit, and (B) shows the guide jig 2 and plate 15 and magnet
14 (14a) during assembly. It is a sectional view showing.
It is a top view which shows the assembly jig at the time of the assembly shown to FIG. 5 (B), the
magnet 14 (14a), and the plate 15. As shown in FIG. It is a perspective view which shows the
assembly jig at the time of the assembly shown to FIG. 5 (B), the magnet 14 (14a), and the plate
15 (15a). It is a perspective view for explaining guide jig 21J of a comparative example. It is a
figure for demonstrating the manufacturing method of the speaker 1. FIG. (A) is a cross-sectional
view for explaining the process of placing the plate 15 and the magnet 14 (14a) on the yoke 13,
(B) is a cross-sectional view of the magnetic circuit 10 at the time of assembly; ) Is a crosssectional view for explaining an assembly process of the magnetic circuit 10 and the vibration
system member. It is a figure for demonstrating the magnetization direction of the magnet 14 of
the magnetic circuit 10 for speakers. (A) is a perspective view for explaining a magnet
magnetized in the central axis direction of the magnet, (B) is a cross-sectional view of the magnet
shown in (A), (C) is a radial direction It is a perspective view for demonstrating the magnet which
was magnetized along FIG. It is a figure for demonstrating one specific example of the assembly
jig which concerns on this invention. (A) is a figure for demonstrating the assembly jig which
concerns on a 1st example, (B) is a figure for demonstrating the assembly jig which concerns on
a 2nd example, (C) is a 3rd It is a figure for demonstrating the assembly jig which concerns on a
specific example. It is a sectional view for explaining a speaker provided with an internal magnet
type magnetic circuit. (A) is a cross-sectional view for explaining a speaker 1E provided with an
inner magnet type magnetic circuit 10E, (B) is a top view of a magnet 14E (14e) of the inner
magnet type magnetic circuit 10E shown in (A) is there.
Explanation of sign
[0102]
1 Speaker 2 Assembly Jig 10 Magnetic Circuit 11 Center Pole 12 Flange 13 Yoke 14 Magnet 15
Plate 16 Frame 17 Diaphragm 18 Edge 19 Voice Coil 21 Guide Jig 22 Base Jig 23 Weight Jig
171 Central Diaphragm Part 172 Voice coil bobbin part 173 Outer peripheral side diaphragm
part 176 Damper 220 Regulating part 221 Flat part 222 First fitting part 223 Second fitting part
224 Notched part
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