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DESCRIPTION JP2007336145

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DESCRIPTION JP2007336145
The present invention provides a method of manufacturing a magnetic circuit for a speaker
device which can improve the quality and is efficient in production. In a method of
manufacturing a magnetic circuit for a speaker device, first and second jigs are used in a first
magnetic body arranging step, a second magnetic body attaching step, and a third magnetic body
attaching step. A method is employed in which the first magnetic body (plate), the second
magnetic body (magnet), and the third magnetic body (yoke) are sequentially stacked and
manufactured. According to this manufacturing method, after the second jig used in this process
is taken out, it can be used in the previous process, and a manufacturing line with high
production efficiency can be configured. In particular, in the second magnetic body mounting
step, the magnet is mounted on the plate through the second jig so that the central axis of the
magnet and the central axis of the plate are coaxially positioned. Accurate positioning of the
central axis of the magnet with respect to the central axis can be performed, and the quality of
the magnetic circuit for a speaker device can be improved. [Selected figure] Figure 3
Method of manufacturing magnetic circuit for speaker device
[0001]
The present invention relates to a method of manufacturing a magnetic circuit for a speaker
device.
[0002]
In general, a speaker device includes a magnetic circuit for a speaker device having a yoke, a
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magnet and a plate, and various vibration system members such as a diaphragm and a voice coil.
Such a speaker device magnetic circuit has a loading structure in which a magnet is disposed on
the yoke and a plate is disposed on the magnet.
[0003]
For example, as a magnetic circuit for a speaker device of this type, Patent Document 1 describes
a magnetic circuit for a speaker device that can reduce the number of assembling steps.
[0004]
The magnetic circuit for a speaker device described in Patent Document 1 mainly includes a yoke
having a bottomed cylindrical portion, an annular magnet disposed on the inner bottom surface
of the bottomed cylindrical portion, and a stacked arrangement on the magnet An annular plate
is provided, and a protrusion capable of being fitted with a hole of a magnet and a plate is
provided on an inner bottom surface of the bottomed cylindrical portion.
[0005]
In the method of assembling such a magnetic circuit for a speaker device, the magnet is fitted to
the protrusion of the bottomed cylindrical portion, fixed to the inner bottom surface using an
adhesive, and then the plate is fitted to the protrusion, It is performed by laminating and fixing
using an adhesive.
According to this configuration, since the magnet and the plate are positioned with respect to the
yoke by fitting the hole of the magnet and the hole of the plate to each other, jigs such as a
center guide are not necessary, and the number of assembling steps can be reduced. It is
assumed.
[0006]
In addition, while the speaker apparatus which is easy to assemble is described in patent
document 2, the manufacturing method of the magnetic circuit for speaker apparatuses which
can be assembled precisely in a short time is described in patent document 3 .
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[0007]
The speaker device described in Patent Document 2 mainly has a structure in which a frame, a
yoke, a magnet, and a top plate are sequentially stacked, and an upright support shaft for
supporting a magnetic circuit portion is integrally formed on the frame. A through hole is formed
at the center of each component of the magnetic circuit unit, and a support shaft of the frame is
inserted through each through hole, and a head of the support shaft is crimped.
[0008]
In such a method of assembling a magnetic circuit for a speaker device, after applying an
adhesive between the frame and the yoke, between the yoke and the magnet, and between the
magnet and the top plate, the yoke is used as a guide with the support shaft of the frame. ,
Through the through holes of the magnet and the top plate sequentially.
Then, the head portion of the support shaft protruding from the top plate is deformed to crimp
the laminated magnetic circuit components.
According to this configuration, the assembly jig is not required, and the assembly of the
magnetic circuit unit to the frame is supposed to be easy.
[0009]
Further, in the method of manufacturing the speaker device described in Patent Document 3, the
positioning pin is inserted into the concave portion provided on the bottom surface of the lower
plate and guided, and the main adhesive and the instantaneous curing type auxiliary adhesive are
used in combination The upper plate positioned by the gap gauge is connected.
It is said that this makes it possible to assemble the speaker device magnetic circuit accurately in
a short time.
[0010]
By devising the structure of the magnetic circuit upper plate and the magnet positioning means
in the manufacturing process, eccentricity of the magnet can be prevented by using a simple
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gauge which can correspond to the magnet of any inner diameter, and the appearance is good.
Patent Document 4 describes a method of assembling a magnetic circuit for a speaker device
which is highly reliable also in terms of performance.
[0011]
JP-A-10-248099 JP-A 2003-289596 JP-A-7-284196 JP-A-10-66192
[0012]
In the patent documents 1 and 2 mentioned above, the shape of the component etc. of the
magnetic circuit for speaker devices is devised (changed), and shortening and facilitation of the
assembly time of the magnetic circuit for speaker devices are achieved without using a jig. It is
supposed to be.
However, if the shapes of the component parts and the like of the speaker device magnetic circuit
are changed, the quality of the speaker device magnetic circuit may be reduced due to the shape.
[0013]
As problems to be solved by the present invention, the above-mentioned ones can be mentioned
as an example.
An object of the present invention is to provide a method of manufacturing a magnetic circuit for
a speaker device, which can improve the quality and has a high production efficiency.
[0014]
The invention according to claim 1 is a method of manufacturing a magnetic circuit for a speaker
device, which comprises disposing a first magnetic body in a first jig having a magnetic gap
forming portion that forms a magnetic gap. Prepare a second jig to be fitted with the first jig and
the step of arranging the magnetic body, and after the second jig is fitted to the first jig, the
second magnetic body is used. Attaching a second magnetic body attaching step on the first
magnetic body; removing the second jig from the first jig; attaching a third magnetic body on the
second magnetic body And a third magnetic body attaching process, and in the second magnetic
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body attaching process, a central axis of the second magnetic body and a central axis of the first
magnetic body are coaxially positioned. The second magnetic body may be attached to the first
magnetic body through the second jig.
[0015]
The invention according to claim 2 has a mounting portion on which the plate is mounted, and a
substantially annular shape protruding from the outer peripheral portion of the mounting
portion described above, and a thickness for setting the distance between the magnetic gaps to a
predetermined distance. And an inner diameter of the magnetic gap forming portion is set to
substantially the same size as an outer diameter of the plate, and an outer diameter of the
magnetic gap forming portion is the cylinder. A first jig set to substantially the same size as the
inner diameter of the portion, a first cylindrical portion having an inner diameter substantially
the same as the outer diameter of the magnet, and an outer side from one end side of the first
cylindrical portion A flange portion extending to a second end portion, and a second portion
projecting from the one end side of the flange portion in the same direction as the projecting
direction of the first cylindrical portion and having an inner diameter substantially the same as
the outer diameter of the first jig And a second jig having a cylindrical portion, said disk having a
disc-like shape. Rate and the magnet, and a yoke having a disk shape and having a magnet
mounting portion on which the magnet is mounted, and a cylindrical portion protruding from the
outer peripheral portion of the magnet mounting portion It is a manufacturing method of the
said magnetic circuit for speaker devices which manufactures a magnetic circuit for speaker
devices, Comprising: The said plate is put on the said mounting part so that the outer peripheral
wall of the said plate and the inner peripheral wall of the said magnetic gap formation part may
contact. A plate disposing step of disposing, and a second jig to be fitted to the first jig are
prepared, and the magnetic gap forming portion, the outer peripheral wall of the first cylindrical
portion, and the inside of the second cylindrical portion A magnet mounting step of mounting the
magnet on the plate after the second jig is fitted to the first jig so that the peripheral wall is in
contact with the first jig; From 1 jig The yoke is placed on the magnet so that the inner
circumferential wall of the cylindrical portion contacts the outer circumferential wall of the
magnetic gap forming portion and the magnet mounting portion contacts the magnet. Mounting
the yoke mounting step, wherein in the magnet mounting step, the central axis of the plate and
the central axis of the magnet are coaxial while the outer peripheral wall of the magnet and the
inner peripheral wall of the first cylindrical portion are in contact with each other The magnet is
mounted on the plate so as to be located on the top.
[0016]
In one embodiment of the present invention, a method of manufacturing a magnetic circuit for a
speaker device includes: forming a first magnetic body in a first jig having a magnetic gap
forming portion that forms a magnetic gap; A second jig is prepared, and a second jig to be fitted
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to the first jig is prepared, and after the second jig is fitted to the first jig, the second magnetic
body is used as the second magnetic body. A second magnetic body attaching step of attaching
on the first magnetic body, and a third step of removing the second jig from the first jig and
attaching a third magnetic body on the second magnetic body And the second magnetic body
mounting step is performed such that the central axis of the second magnetic body and the
central axis of the first magnetic body are coaxially positioned. The second magnetic body is
attached onto the first magnetic body through a second jig.
[0017]
In the method of manufacturing a magnetic circuit for a speaker device described above, first, in
the first magnetic body arranging step, the first magnetic body (for example, a plate) is provided
in a first jig having a magnetic gap forming portion that forms a magnetic gap. Place).
Next, in the second magnetic body attaching step, a second jig to be fitted to the first jig is
prepared, and after the second jig is fitted to the first jig, the second step is performed. A
magnetic body (for example, a magnet) is attached on the first magnetic body.
Next, in the third magnetic body attaching step, the second jig is taken out of the first jig, and the
third magnetic body (for example, a yoke) is attached on the second magnetic body.
[0018]
As described above, in the method of manufacturing the magnetic circuit for a speaker device, a
method of sequentially stacking and manufacturing the first magnetic body, the second magnetic
body, and the third magnetic body, which are the components thereof, is adopted. .
Therefore, the problem as in Comparative Example 2 described later does not occur. That is, it is
possible to prevent the attachment state of the components of the speaker device magnetic
circuit from being confused in the manufacturing process.
[0019]
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In addition, if this manufacturing method is adopted, the second jig taken out of the first jig in
the third magnetic body mounting step is used as a magnetic circuit for a speaker device
manufactured in the previous step of this step. At the same time as it becomes possible to use for
such a work in process, the work in process related to the speaker device magnetic circuit of this
process immediately after the second jig is taken out is the third magnetic body which is the next
process. It is possible to smoothly shift to the process of mounting on the second magnetic body.
Therefore, particularly in the case of a production line that requires mass production of the
speaker device magnetic circuit, it is not necessary to prepare a plurality of second jigs, and a
production line with high production efficiency can be obtained. Thus, an inexpensive speaker
device magnetic circuit can be obtained.
[0020]
In particular, in the method of manufacturing a magnetic circuit for a speaker device, the second
magnetic body attaching step is performed in such a manner that the central axis of the second
magnetic body and the central axis of the first magnetic body are coaxially positioned. Since the
second magnetic body is attached onto the first magnetic body through the jig 2, the problems as
in Comparative Example 1 to be described later do not occur. That is, according to this
manufacturing method, accurate positioning of the central axis of the second magnetic body can
be performed with respect to the central axis of the first magnetic body, and defects in the
characteristics of the magnetic circuit of the speaker device This can be prevented from
occurring. Therefore, the quality of the speaker device magnetic circuit can be improved.
[0021]
In another embodiment of the present invention, the mounting portion on which the plate is
mounted and a substantially annular shape protruding from the outer peripheral portion of the
mounting portion described above, and the thickness setting the magnetic gap interval to a
predetermined interval And an inner diameter of the magnetic gap forming portion is set to
substantially the same size as an outer diameter of the plate, and an outer diameter of the
magnetic gap forming portion is the cylinder. A first jig set to substantially the same size as the
inner diameter of the portion, a first cylindrical portion having an inner diameter substantially
the same as the outer diameter of the magnet, and an outer side from one end side of the first
cylindrical portion A flange portion extending to a second end portion, and a second portion
projecting from the one end side of the flange portion in the same direction as the projecting
direction of the first cylindrical portion and having an inner diameter substantially the same as
the outer diameter of the first jig And a second jig having a cylindrical portion, wherein the front
portion has a disk shape. A plate and the magnet, and a yoke having a disk shape, having a
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magnet mounting portion on which the magnet is mounted, and a cylindrical portion protruding
from an outer peripheral portion of the magnet mounting portion It is a manufacturing method
of the said magnetic circuit for speaker devices which manufactures a magnetic circuit for
speaker devices, Comprising: The said plate is put on the said mounting part so that the outer
peripheral wall of the said plate and the inner peripheral wall of the said magnetic gap formation
part may contact. A plate disposing step of disposing, and a second jig to be fitted to the first jig
are prepared, and the magnetic gap forming portion, the outer peripheral wall of the first
cylindrical portion, and the inside of the second cylindrical portion A magnet mounting step of
mounting the magnet on the plate after the second jig is fitted to the first jig so that the
peripheral wall is in contact with the first jig; Is it a jig of 1 The yoke is mounted on the magnet
so that the inner circumferential wall of the cylindrical portion and the outer circumferential wall
of the magnetic gap forming portion come into contact with each other and the magnet mounting
portion and the magnet contact each other. A yoke mounting step, and in the magnet mounting
step, the central axis of the plate and the central axis of the magnet are coaxial while the outer
peripheral wall of the magnet and the inner peripheral wall of the first cylindrical portion are in
contact with each other The magnet is mounted on the plate so as to be located at
[0022]
In the method of manufacturing a magnetic circuit for a speaker device described above, first, in
the plate disposing step, the plate is disposed on the placement portion such that the outer
circumferential wall of the plate and the inner circumferential wall of the magnetic gap forming
portion are in contact.
Next, in the magnet attachment step, a second jig to be fitted to the first jig is prepared, and the
magnetic gap forming portion and the outer peripheral wall of the first cylindrical portion and
the inner peripheral wall of the second cylindrical portion After fitting the second jig to the first
jig so as to make contact, the magnet is mounted on the plate. Next, in the yoke mounting step,
the second jig is taken out from the first jig, and the magnet mounting portion and the outer
circumferential wall of the magnetic gap forming portion are brought into contact with each
other, and Attach the yoke on the magnet so that it contacts the magnet.
[0023]
As described above, in the method of manufacturing the magnetic circuit for a speaker device, a
method of sequentially stacking and manufacturing the plate, the magnet, and the yoke, which
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are the components thereof, is adopted. Therefore, the problem as in Comparative Example 2
described later does not occur. That is, it is possible to prevent the attachment state of the
components of the speaker device magnetic circuit from being confused in the manufacturing
process.
[0024]
In addition, if this manufacturing method is adopted, the second jig taken out of the first jig in
the yoke attachment step is a work in process for the speaker device magnetic circuit
manufactured in the previous step of this step. At the same time as it becomes possible to use it,
the in-process product pertaining to the magnetic circuit for a speaker device of this process
immediately after the second jig is taken out smoothly to the next process of mounting the yoke
on the magnet. It is possible to shift to Therefore, particularly in the case of a production line that
requires mass production of the speaker device magnetic circuit, it is not necessary to prepare a
plurality of second jigs, and a production line with high production efficiency can be obtained.
Thus, an inexpensive speaker device magnetic circuit can be obtained.
[0025]
Particularly, in the method of manufacturing the magnetic circuit for a speaker device, in the
magnet attachment step, the second jig is taken out from the first jig, and the inner
circumferential wall of the cylindrical portion of the yoke and the outer circumferential wall of
the magnetic gap forming portion Since the yoke is attached on the magnet so as to be in contact
and in such a manner that the magnet mounting portion and the magnet are in contact with each
other, such a problem as in Comparative Example 1 described later does not occur. That is,
according to this manufacturing method, accurate positioning of the central axis of the magnet
with respect to the central axis of the plate can be performed, and the occurrence of
characteristic defects can be prevented in the magnetic circuit for a speaker device. Therefore,
the quality of the speaker device magnetic circuit can be improved.
[0026]
Hereinafter, preferred embodiments of the present invention will be described with reference to
the drawings.
[0027]
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[Configuration of Speaker Device] First, the configuration of a speaker device having a magnetic
circuit for a speaker device manufactured by the manufacturing method according to the
embodiment of the present invention will be described with reference to FIGS. 1 and 2.
[0028]
FIG. 1 shows a cross-sectional view when the speaker device 100 is cut along a plane passing
through the central axis L1.
[0029]
As shown in FIG. 1, the speaker device 100 is a speaker device magnetic circuit 30 having a yoke
1, a magnet 2 and a plate 3, and a vibration having a frame 4, a voice coil bobbin 5, a voice coil
6, a diaphragm 7 and an edge 8. And a system member 31.
In the present invention, the structure and driving method of the speaker device and the shapes
of the components thereof are not limited.
[0030]
First, the configuration of the speaker device magnetic circuit 30 will be described.
[0031]
The speaker device magnetic circuit 30 is configured as an internal magnet type magnetic circuit.
[0032]
The yoke 1 has a bottomed cylindrical shape with a bottom, has a substantially disc shape, and is
located above the magnet mounting portion 1a on which the magnet 2 is mounted and the outer
peripheral portion of the magnet mounting portion 1a. And a cylindrical portion 1b protruding to
the bottom.
The magnet 2 has a disk-like shape, and is attached on the magnet mounting portion 1 a via an
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adhesive 10.
The central axis passing through the center of the magnet 2 and the central axis passing through
the center of the yoke 1 are located coaxially (central axis L1).
The plate 3 has a disk-like shape, and is attached on the magnet 2 via an adhesive 10.
The central axis of the plate 3 and the central axes of the magnet 2 and the yoke 1 are located
coaxially (central axis L1).
[0033]
In the speaker device magnetic circuit 30 having the above configuration, a magnetic gap 32
having a constant gap d1 is formed between the outer peripheral wall of the plate 3 and the
inner peripheral wall of the cylindrical portion 1b of the yoke 1.
[0034]
Next, the configuration of the vibration system member 31 will be described.
[0035]
The frame 4 has a function of supporting various components of the speaker device 100.
The frame 4 has a bowl-like and step-like cross-sectional shape and is provided on the lower end
side thereof, and is provided on the placement portion 4a on which the speaker device magnetic
circuit 30 is placed, and is provided on the upper end side to support the edge 8 And an edge
support 4b.
The speaker device magnetic circuit 30 is accommodated in the frame 4 in a state of being
mounted on the mounting portion 4a.
[0036]
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The voice coil bobbin 5 has a cylindrical shape, and is disposed at a position covering the side
surface of the plate 3, a part of the side surface of the magnet 2, and the like.
[0037]
The voice coil 6 is wound around the outer peripheral wall of the voice coil bobbin 5, and at least
a portion of the voice coil 6 is disposed in the magnetic gap 32.
The voice coil 6 consists of one wire and has positive and negative lead wires not shown. The
lead wire on the positive side is an input wiring of the L (or R) channel signal, and the lead wire
on the negative side is an input wiring of the ground (GND: ground) signal. The positive and
negative lead wires are electrically connected to terminals (not shown), and the terminals are also
electrically connected to output wires on the amplifier side (not shown). As a result, signals and
power for one channel are input to the voice coil 6 from the amplifier side through the terminals
and the plus and minus lead wires.
[0038]
The diaphragm 7 has a dome shape and plays a role of emitting a sound wave. One end side of
the diaphragm 7 is attached near the upper end of the outer peripheral wall of the voice coil
bobbin 5, and the diaphragm 7 vibrates together with the voice coil bobbin 5.
[0039]
The edge 8 has an annular planar shape and an ohm-like cross-sectional shape, and the inner
peripheral edge portion thereof is attached to the upper end portion of the outer peripheral wall
of the voice coil bobbin 5, and the outer peripheral portion thereof is the edge support portion 4
b of the frame 4 Mounted on top.
[0040]
In the speaker device 100 having the above configuration, the signal and the power output from
the amplifier side are supplied to the voice coil 6 through the terminals and the positive and
negative lead wires of the voice coil 6.
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As a result, driving force is generated in the voice coil 6 in the magnetic gap 32, and the
diaphragm 7 is vibrated in the direction of the central axis L 1 of the speaker device 100. Thus,
the speaker device 100 emits a sound wave in the direction of the arrow Y1.
[0041]
[Method of Manufacturing Magnetic Circuit for Speaker Device] Next, a method of manufacturing
the magnetic circuit 30 for a speaker device according to the embodiment of the present
invention described above will be described with reference to FIGS. 2 and 3.
[0042]
FIG. 2 shows a flowchart of a method of manufacturing the magnetic circuit 30 for the present
speaker device.
FIG. 3 shows a manufacturing process of the magnetic circuit 30 for the present speaker device.
[0043]
In the present embodiment, the speaker device magnetic circuit 30 is manufactured using two
jigs.
[0044]
Here, prior to describing a specific manufacturing method of the present embodiment, the
configuration of the first jig 70 will be described first with reference to FIG. 3A, and FIG. 3B will
be described. Then, the configuration of the second jig 71 will be described.
[0045]
As shown in FIG. 3A, the first jig 70 has a cylindrical shape, and has a placement portion 70a
having a placement surface 70ab for placing the plate 3 and an outer periphery of the placement
portion 70a. The magnetic gap forming portion 70 b protrudes from the portion to have a
substantially annular shape, and the magnetic gap 32 is set to have a predetermined interval.
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The inner diameter of the magnetic gap forming portion 70 b is set to substantially the same size
as the outer diameter d 2 of the plate 3, while the outer diameter of the magnetic gap forming
portion 70 b is substantially the same as the inner diameter of the cylindrical portion 1 b of the
yoke 1. The size is set (see also FIG. 3 (d)).
[0046]
On the other hand, the second jig 71 includes a first cylindrical portion 71a having an inner
diameter substantially the same as the outer diameter d3 of the magnet 2, and a flange portion
71b extending outward from one end side of the first cylindrical portion 71a. A second
cylindrical portion 71c which protrudes from the one end side of the flange portion 71b in the
same direction as the projecting direction of the first cylindrical portion 71a and which has an
inner diameter substantially the same as the outer diameter of the first jig 70; .
The first cylindrical portion 71a and the second cylindrical portion 71c face each other at a
constant distance d1. The second jig 71 is used in combination with the first jig 70 in step S3
described later, and the fitting state of the first jig 70 and the second jig 71 at this time is as
follows. It is. That is, as shown in FIG. 3B, the second jig 71 includes the magnetic gap forming
portion 70b of the first jig 70, the outer peripheral wall of the first cylindrical portion 71a, and
the second cylindrical portion 71c. The first jig 70 is used in a state of being in contact with the
inner peripheral wall of the first jig 70.
[0047]
In the present manufacturing method, first, a plate (a first magnetic body, hereinafter the same) 3
having a disk shape is disposed in the above-described first jig 70 (step S1). Specifically, as
shown in FIG. 3A, the disk-shaped plate 3 is disposed on the mounting surface 70ab of the first
jig 70. Next, as shown in FIG. 3A, the adhesive 10 is applied onto the plate 3 (step S2).
[0048]
Next, as shown in FIG. 3B, the second jig 71 is fitted to the first jig 70 so as to be in the above-
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mentioned fitting state (step S3). In the present embodiment, the order of step S2 and step S3
may be changed.
[0049]
Next, as shown in FIG. 3B, a magnet (second magnetic body, the same applies hereinafter) 2 is
placed on the plate 3 through the adhesive 10 through the second jig 71 (step S4). Thereby,
accurate positioning of the central axis of the magnet 2 with respect to the central axis of the
plate 3 can be performed. That is, the central axis of the plate 3 and the central axis of the
magnet 2 can be coaxially positioned.
[0050]
Next, the state is left for a while to dry the adhesive 10 for bonding the plate 3 and the magnet 2,
and then, as shown in FIG. 3C, the second jig 70 from the first jig 70 is used. The jig 71 is taken
out (step S4). Next, as shown in FIG. 3C, the adhesive 10 is applied onto the magnet 2 (step S5).
In the present embodiment, the order of step S5 and step S6 may be changed.
[0051]
Next, as shown in FIG. 3D, a yoke (third magnetic body, hereinafter the same) 1 is disposed on
the magnet 2 via the adhesive 10 (step S7). Specifically, the yoke 1 is disposed on the magnet 2
via the adhesive 10 so that the inner peripheral wall of the cylindrical portion 1 b of the yoke 1
and the outer peripheral wall of the first jig 70 are in contact with each other. As a result, a
magnetic gap forming portion 70b having a constant distance d1 is located between the
cylindrical portion 1b of the yoke 1 and the plate 3, and an air gap having a constant distance d1
between them, ie, the magnetic A gap 32 is formed.
[0052]
Next, the state is left for a while to dry the adhesive 10 for bonding the yoke 1 and the magnet 2
and then, in FIG. 3D, the speaker device magnetic circuit 30 is used as a first jig. By taking out
from 70 (process S8), the speaker device magnetic circuit 30 according to the present
embodiment is manufactured.
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[0053]
The method of manufacturing the speaker device magnetic circuit 30 according to the present
embodiment described above exhibits advantageous effects as compared with the method of
manufacturing the speaker device magnetic circuit according to Comparative Examples 1 and 2.
[0054]
First, with reference to FIG. 4, a method of manufacturing a magnetic circuit for a speaker device
according to comparative example 1 and its problems will be described.
[0055]
The configuration of the speaker device magnetic circuit 30x manufactured by the
manufacturing method according to Comparative Example 1 is the same as the configuration of
the speaker device magnetic circuit 30 according to the present example.
Therefore, in the following, the same components as those of the speaker device magnetic circuit
30 according to the above-described embodiment will be described with the same reference
numerals.
Moreover, below, the description about the process same as the manufacturing process of the
magnetic circuit 30 for speaker devices of the above-mentioned present Example is simplified or
abbreviate | omitted.
[0056]
FIG. 4 shows a manufacturing process of the speaker device magnetic circuit 30x according to
the first comparative example.
[0057]
First, as shown in FIG. 4A, the plate 3 having a disk shape is disposed in the above-described first
jig 70 (step P1), and then the adhesive 10 is applied on the plate 3 (Step P2).
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Next, the magnet 2 is disposed on the plate 3 via the adhesive 10 so that the central axis of the
plate 3 and the central axis of the magnet 2 are coaxially positioned (step P3).
Next, the state is left for a while to dry the adhesive 10 for bonding the plate 3 and the magnet 2
and then the adhesive 10 is applied on the magnet 2 as shown in FIG. Process P4). Next, as
shown in FIG. 4D, the yoke 1 is disposed on the magnet 2 via the adhesive 10 in the abovedescribed manner (process P5). As a result, a magnetic gap 32 having a constant distance d1 is
formed between the cylindrical portion 1b of the yoke 1 and the plate 3 via the magnetic gap
forming portion 70b. Next, the state is left for a while to dry the adhesive 10 which joins the
yoke 1 and the magnet 2 and then, in FIG. 4D, the speaker device magnetic circuit 30x is used as
a first jig. By taking out from 70 (process P6), the speaker device magnetic circuit 30x according
to the comparative example 1 is manufactured.
[0058]
In the method of manufacturing the magnetic circuit 30x for a speaker device according to the
comparative example 1 described above, since the plate 3, the magnet 2, and the yoke 1 are
sequentially stacked and manufactured, the production efficiency is good, but the following
problems occur.
[0059]
That is, in the process P3, the magnet 2 is bonded via the adhesive 10 so that the central axis of
the plate 3 and the central axis of the magnet 2 are coaxially positioned without using the
positioning jig as in this embodiment. Since it arrange | positions on the plate 3, there existed a
subject that the considerable time will be needed to perform the positioning.
In addition, while the adhesive 10 connecting the magnet 2 and the plate 3 is dried from that
state, as shown in FIG. There has been a problem that the central axis of the plate 3 and the
central axis of the magnet 2 are deviated by flowing in the direction of the arrow Y20 or the like.
In addition, at this time, a part of the adhesive 10 for bonding the magnet 2 and the plate 3 may
be protruded. When the speaker device magnetic circuit 30x is manufactured in such a state, the
speaker device magnetic circuit 30x is defective in characteristics (for example, the relative
positional relationship of the components of the speaker device magnetic circuit 30x is broken).
Problems caused by the above-mentioned problem or defects in other characteristics occur due
to a part of the adhesive 10 which has run out in the step S3.
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17
[0060]
Next, with reference to FIG. 5, a method of manufacturing the speaker device magnetic circuit 30
y according to the comparative example 2 and its problems will be described.
[0061]
The configuration of the speaker device magnetic circuit 30y manufactured by the
manufacturing method according to Comparative Example 2 is the same as the configuration of
the speaker device magnetic circuit 30 according to the present example.
Therefore, in the following, the same components as those of the speaker device magnetic circuit
30 according to the above-described embodiment will be described with the same reference
numerals. Moreover, below, the description about the process same as the manufacturing
process of the magnetic circuit 30 for speaker devices of the above-mentioned present Example
is simplified or abbreviate | omitted.
[0062]
FIG. 5 shows a manufacturing process of the speaker device magnetic circuit 30y according to
Comparative Example 2. As shown in FIG.
[0063]
In the manufacturing method of Comparative Example 2, the magnetic circuit 30y for a speaker
device is manufactured by using two jigs as in the present embodiment.
Here, prior to describing the manufacturing method of Comparative Example 2, the configuration
of the first jig 72 according to Comparative Example 2 will be described first with reference to
FIG. 5 (a).
[0064]
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18
As shown in FIG. 5A, the first jig 72 has a cylindrical shape and has a placement portion 72a
having a placement surface 72ab for placing the plate 3, and an outer periphery of the placement
portion 72a. The first annular portion 72b for positioning the magnet 2 and the substantially
annular shape projecting from the first annular portion 72b. And a second annular portion 72c
to be performed. The inner diameter d3 of the first annular portion 72b is set to substantially the
same size as the outer diameter of the magnet 2, and the inner diameter d2 of the second
annular portion 72c is substantially the same as the outer diameter of the plate 3 Is set to the
size of. The outer diameter of the first jig 72 is set to substantially the same size as the inner
diameter d4 of the yoke 1. The first jig 72 having the above configuration particularly has a
function of accurately positioning the central axis of the magnet 2 with respect to the central axis
of the plate 3.
[0065]
In the manufacturing method according to Comparative Example 2, first, as shown in FIG. 5A, the
plate 3 having a disk-like shape is disposed in the first jig 72 (step Q1). Specifically, the magnet 2
is placed on the mounting surface 72ab so that a part of the outer peripheral wall of the magnet
2 and the inner peripheral wall of the first annular portion 72b are in contact with each other.
Thereby, positioning of the magnet 2 with respect to the first jig 72 can be performed. Next, as
shown in FIG. 5A, the adhesive 10 is applied onto the magnet 2 (step Q2). Next, as shown in FIG.
5B, the plate 3 is placed on the magnet 2 via the adhesive 10 so that the outer peripheral wall of
the plate 3 and the inner peripheral wall of the second annular portion 72c are in contact with
each other. (Step Q3). Thereby, the central axis of the plate 3 and the central axis of the magnet 2
can be coaxially positioned.
[0066]
Next, the state is left for a while to dry the adhesive 10 for bonding the plate 3 and the magnet 2,
and then, in FIG. 5B, the combination of the plate 3 and the magnet 2 is used as a first jig. 72.
Further, the second jig 70x having the same configuration as the first jig 70 described above is
prepared, and the taken out combined body is disposed in the second jig 70x (step Q4) ). At this
time, as shown in FIG. 5C, in other words, the relative positional relationship between the
combination of the plate 3 and the magnet 2 is opposite to that in the case of the above steps Q1
to Q3, in other words, The combination is placed on the mounting surface 70ab such that the
mounting surface 70ab of the second jig 70x and the plate 3 are in contact with each other. Next,
as shown in FIG. 5 (c), the adhesive 10 is applied on the magnet 2 (step Q5), and then, as shown
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19
in FIG. 5 (d), the yoke 1 is bonded via the adhesive 10. It arranges on the magnet 2 (process Q6).
As a result, a magnetic gap 32 having a constant distance d1 is formed between the cylindrical
portion 1b of the yoke 1 and the plate 3 via the magnetic gap forming portion 70b. Next, the
state is left for a while to dry the adhesive 10 for bonding the yoke 1 and the magnet 2 to each
other. Subsequently, in FIG. 5D, the speaker device magnetic circuit 30y is used as a second jig.
By taking out from 70x (process Q7), the speaker device magnetic circuit 30y according to
Comparative Example 2 is manufactured.
[0067]
The method of manufacturing the magnetic circuit 30y for the speaker device according to the
comparative example 2 described above is not a method of sequentially stacking and
manufacturing the components of the magnetic circuit for the speaker device, but replacing two
kinds of jigs in the middle of the manufacturing process It is necessary to provide a step Q4 for
reversing the front and back of the combined body of the magnet 2 and the plate 3 in accordance
with the operation, which is a manufacturing method with extremely low production efficiency.
In addition, when replacing the jig, it is easy to make a mistake of disposing the combined body
in the second jig 70y by mistaken positional relationship between the front and back of the
combined body. That is, originally, it is necessary to arrange the combined body on the mounting
surface 70ab so that the mounting surface 70ab of the second jig 70y and the plate 3 are in
contact with each other. The combination may be disposed on the mounting surface 70ab such
that the mounting surface 70ab of the jig 70y and the magnet 2 come into contact with each
other. Then, in the later manufacturing process, there is a problem that the yoke 1 is attached on
the plate 3 and a defective product is generated.
[0068]
In this respect, since the method of manufacturing the magnetic circuit 30 for a speaker device
according to the present embodiment has the following steps as described above, the problems
as described in the comparative examples 1 and 2 can be solved.
[0069]
That is, in the method of manufacturing the magnetic circuit 30 for the speaker device according
to the present embodiment, the plate (the first surface of the mounting portion 70b in the first jig
70 having the structure forming the magnetic gap 32 is formed Prepare a first magnetic body
arranging step (corresponding to step S1) for arranging the magnetic body 3) and a second jig
71 to be fitted with the first jig 70, and A second magnetic body attaching process (process S2)
for attaching the magnet (second magnetic body) 2 to the plate 3 through the adhesive 10 after
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the second jig 71 is fitted to the first jig 70 Through the step S4) and the third magnetism for
taking out the second jig 71 from the first jig 70 and attaching the yoke (third magnetic body) 1
to the magnet 2 through the adhesive 10 Body attaching step (corresponding to step S5 to step
S7), and the second magnetic body attaching step includes Gunetto as the central axis of the
plate 3 2 is located coaxially, characterized in that mounted on the plate 3 of magnet 2 through
the second jig 71.
[0070]
In the method of manufacturing the magnetic circuit 30 for a speaker device, first, in the first
magnetic body disposing step, the mounting surface 70ab of the mounting portion 70b in the
first jig 70 having a structure forming the magnetic gap 32 is formed. The plate (first magnetic
body) 3 is placed on the
Next, in the second magnetic body attaching step, the second jig 71 fitted with the first jig 70 is
prepared, and the second jig 71 is used as the first jig in the above-mentioned fitted state. After
fitting with 70, the magnet (second magnetic body) 2 is attached onto the plate 3 through the
adhesive 10.
Next, in the third magnetic body attaching step, the second jig 71 is taken out from the first jig
70, and the yoke (third magnetic body) 1 is attached onto the magnet 2 through the adhesive 10.
.
[0071]
As described above, in the method of manufacturing the magnetic circuit 30 for a speaker device,
a method of sequentially stacking and manufacturing the plate 3, the magnet 2 and the yoke 1
which are the constituent elements thereof is adopted. Therefore, the problem as described in
Comparative Example 2 does not occur. That is, it is possible to prevent the attachment states of
the components of the speaker device magnetic circuit 30 from being confused in the
manufacturing process.
[0072]
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21
In addition, if this manufacturing method is adopted, the second jig 71 taken out of the first jig
70 is immediately manufactured through the above-described steps S1 to S2 in the third
magnetic body attaching step. It is possible to sequentially use the work in process according to
another speaker device magnetic circuit, that is, to use the work in process manufactured in step
S3 according to the previous process of this process At the same time, the in-process product
pertaining to the magnetic circuit for a speaker device of this process immediately after the
second jig 71 is taken out is smoothly transferred to the process of mounting the yoke 1 on the
magnet 2 which is the next process. Is possible. Therefore, particularly in the case of a
production line that requires mass production of the speaker device magnetic circuit, it is not
necessary to prepare a plurality of second jigs 71, and therefore, a production line with high
production efficiency can be obtained. Thus, the inexpensive speaker device magnetic circuit 30
can be obtained.
[0073]
In particular, in the method of manufacturing the magnetic circuit 30 for a speaker device, in the
second magnetic body attaching step, the second jig 71 is disposed such that the central axis of
the magnet 2 and the central axis of the plate 3 are coaxially positioned. The magnet 2 is
mounted on the plate 3 through the above, so that the problem as in the comparative example 1
described above does not occur. That is, according to this manufacturing method, accurate
positioning of the central axis of the magnet 2 with respect to the central axis of the plate 3 can
be performed. It is possible to prevent the occurrence of a defect due to the protrusion of the
adhesive 10 that bonds the three. Therefore, the quality of the speaker device magnetic circuit
30 can be improved.
[0074]
Further, in the method of manufacturing the magnetic circuit 30 for a speaker device, in the third
magnetic body attaching step, the inner peripheral wall of the cylindrical portion 1b of the yoke
1 after the second jig 71 is taken out from the first jig 70. The yoke 1 is mounted on the magnet
2 such that the magnet mounting portion 1a and the magnet 2 are in contact with each other
such that the outer peripheral wall of the magnetic gap forming portion 70b is in contact with
the magnet mounting portion 1a. Therefore, the central axis of the combined body of the magnet
2 and the plate 3 and the central axis of the yoke 1 can be coaxially positioned, and the central
axis of the magnet 2 is aligned with the central axes of the plate 3 and the yoke 1 A speaker
device magnetic circuit 30 can be obtained.
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[0075]
[Modification] Next, referring to FIG. 6, the configuration of the speaker device 200 having the
speaker device magnetic circuit 30 according to the modification and the method of
manufacturing the speaker device magnetic circuit 30 according to the modification will be
briefly described. Describe.
[0076]
FIG. 6A shows a cross-sectional view of the speaker device 200 according to the modification
taken along a plane passing through the central axis L1.
FIG. 6B is a process diagram according to the speaker device magnetic circuit 30y corresponding
to the process S7 described above.
[0077]
When the speaker device 100 according to the above-described embodiment is compared with
the speaker device 200 according to the modification, only the shape of the frame and the
attachment state of the frame to the yoke 1 are different, and the other configurations are the
same. . That is, in the modification, a frame 4x having a substantially annular shape is attached to
the yoke 1 by an insert molding method. For this reason, the outer peripheral edge portion of the
edge 8 is attached to the upper surface 4 ax of the frame 4. In addition, in the modification, since
the other configuration is the same as the above-described embodiment, the description thereof
is omitted.
[0078]
When manufacturing the speaker device magnetic circuit 30 according to the modification
having such a configuration, the inner circumferential wall of the cylindrical portion 1b of the
yoke 1 and the outer circumferential wall of the magnetic gap forming portion 70b are formed in
step S7 of the above embodiment. The yoke 1 to which the frame 4 is attached by the insert
molding method is disposed on the magnet 2 via the adhesive 10 so as to be in contact with the
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23
magnet 4. In the manufacturing method according to the modification, the other manufacturing
steps are the same as those of the above-described embodiment, and therefore the description
thereof is omitted. Therefore, as compared with a manufacturing method in which the frame 4 is
attached after the speaker device magnetic circuit 30 is manufactured, the manufacturing
process can be reduced.
[0079]
In the present invention, the shape of each component of the speaker device magnetic circuit 30
is not limited to the above embodiment, and the shape can be variously modified without
departing from the scope of the present invention. is there. For example, in the above
embodiment, the speaker device magnetic circuit 30 constitutes a so-called round type magnetic
circuit, and more specifically, each component of the speaker device magnetic circuit 30 has a
circular planar shape However, in the present invention, instead of this, the speaker device
magnetic circuit constitutes a so-called oval type magnetic circuit, and specifically, each
component of the speaker device magnetic circuit is oval. It may be configured to have a planar
shape. When manufacturing such a speaker device magnetic circuit, the first jig 70 and the
second jig 71 also need to be configured to have an oblong planar shape based on the abovedescribed configuration. . The method of manufacturing the magnetic circuit for the speaker
device in this case is the same as the method of manufacturing the magnetic circuit 30 for the
speaker device according to the above-described embodiment.
[0080]
It is sectional drawing which shows the structure of the speaker apparatus which has a magnetic
circuit for speaker apparatuses manufactured by the manufacturing method which concerns on
the Example of this invention. 3 shows a flowchart of a method of manufacturing a magnetic
circuit for a speaker device according to an embodiment of the present invention. The
manufacturing process of the magnetic circuit for speaker devices which concerns on a present
Example is shown. 7 shows a manufacturing process of a magnetic circuit for a speaker device
according to Comparative Example 1. 13 shows a manufacturing process of a magnetic circuit for
a speaker device according to Comparative Example 2. The structure of the speaker apparatus
which has a magnetic circuit for speaker apparatuses manufactured by the manufacturing
method which concerns on a modification, and a part of manufacturing process of the magnetic
circuit for speaker apparatuses are shown.
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Explanation of sign
[0081]
DESCRIPTION OF SYMBOLS 1 yoke (3rd magnetic body) 1a magnet mounting part 1b cylindrical
part 2 magnet (2nd magnetic body) 3 plate (1st magnetic body) 10 adhesive agent 30 magnetic
circuit for speaker devices 32 magnetic gap 70 1st Jig 70a mounting portion 70b magnetic gap
forming portion 71 second jig 71a first cylindrical portion 71b flange portion 71c second
cylindrical portion 100, 200 speaker device
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