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JP2005159982

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DESCRIPTION JP2005159982
PROBLEM TO BE SOLVED: To provide a speaker device capable of improving the heat radiation
efficiency of a magnetic circuit and the like. A speaker device includes a magnetic circuit
including a pot type yoke having a bottom, a flat magnet having an opening, and a flat plate. The
magnet and the plate are integrated by the adhesive element in such a manner that their central
axes coincide with each other. The integrated magnet and plate are secured to the pot yoke by
adhesive elements. When the speaker device is driven, the voice coil generates heat, which is
transferred to the magnet and the plate. The plate is located closer to the voice coil than the
magnet, so the temperature is the highest. However, in the present speaker device, since the
opening is formed in the magnet, the heat transmitted to the plate is dissipated to the outside
through the opening. Thus, the heat radiation efficiency of the magnetic circuit can be improved.
[Selected figure] Figure 4
Speaker apparatus and method of manufacturing the same
[0001]
The present invention relates to the structure of a magnet and a plate in a speaker device.
[0002]
A speaker device is conventionally known that includes a magnetic circuit including a pot-shaped
yoke having an opening at its center, a flat magnet having no opening, and a flat plate.
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In such a speaker device, a flat plate-like magnet is disposed on the pot type yoke, and the plate
is further disposed on the magnet so as to form an inner-magnet-type magnetic circuit.
[0003]
As a speaker device having a magnetic circuit of this type, for example, a speaker in which high
magnetic efficiency of the magnetic circuit is realized is known (see, for example, Patent
Document 1). In this speaker, a flat magnet is disposed on a yoke having an opening, and a flat
top plate is further disposed on the magnet to form a magnetic circuit.
[0004]
However, when the above-mentioned speaker is driven, the voice coil generates heat, which is
also transferred to a magnetic circuit such as a plate or a magnet. In general, the plate is located
closer to the voice coil than the magnet, so the temperature is the highest in the magnetic circuit.
However, the above-mentioned speaker has a problem that the heat transmitted from the voice
coil to the plate can not be dissipated efficiently.
[0005]
Moreover, in the manufacturing process of such a speaker, the magnetic circuit is manufactured
by fixing the yoke and the magnet with an adhesive, and further fixing the magnet and the plate
with an adhesive. However, once the components of the magnetic circuit were assembled, it was
not possible to confirm the applied state or the dried state of the adhesive later. Therefore, a
magnetic circuit with an improper adhesion state may be attached to the speaker, which causes a
problem that the quality of the speaker is degraded.
[0006]
Japanese Patent Application Publication No. 2003-209898
[0007]
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2
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 speaker device capable of improving the heat
radiation efficiency of a magnetic circuit, and a method of manufacturing the same.
[0008]
The invention according to claim 1 is a speaker device, which includes a magnet, a pot type yoke
having a bottom portion for mounting the magnet, and a magnetic circuit having a plate mounted
on the magnet. And an opening is formed in the magnet and the bottom, and the openings are in
communication with each other.
[0009]
The invention according to claim 3 is a speaker device, which includes a magnet, a pot type yoke
having a bottom for mounting the magnet, and a magnetic circuit having a plate mounted on the
magnet. The plate is characterized in that an opening is formed.
[0010]
The invention according to claim 7 is a method of manufacturing a speaker device, wherein the
magnet and the plate are pasted via an adhesive element in a state in which the flat magnet and
the central axis of the flat plate are aligned. The step of attaching, the step of checking the
adhesion state of the magnet and the plate through the opening formed in the magnet, the
opening formed in the magnet, and the opening formed in the pot type yoke are communicated.
And bonding the lower surface of the magnet and the upper surface of the pot type yoke via an
adhesive element, and bonding the magnet and the pot type yoke through an opening formed in
the pot type yoke. And a step of checking the propriety of the above.
[0011]
The invention according to claim 8 is a method for manufacturing a speaker device, wherein the
magnet and the plate are pasted via an adhesive element in a state in which the flat magnet and
the central axis of the flat plate are aligned. The step of attaching, the step of checking the
adhesion between the magnet and the plate through the opening formed in the plate, and the
lower surface of the magnet in a state where the central axes of the magnet and the pot type
yoke are aligned. And affixing the upper surface of the pot type yoke via an adhesive element,
and checking the appropriateness of adhesion between the magnet and the pot type yoke
through an opening formed in the pot type yoke. It is characterized by having.
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[0012]
In one embodiment of the present invention, the speaker device includes a magnetic circuit
having a magnet, a pot type yoke having a bottom for mounting the magnet, and a plate mounted
on the magnet. Openings are formed in the magnet and the bottom, and the openings
communicate with each other.
[0013]
In the above speaker device, the magnet and the plate are integrated via the adhesive element.
Furthermore, the integrated magnet and plate are fixed to the pot type yoke via an adhesive
element.
Thus, in the present speaker device, the magnet, the plate, the pot type yoke and the like
constitute a magnetic circuit.
When the speaker device is driven, the voice coil generates heat, which is transferred to the
magnet and the plate.
At this time, since the plate is disposed at a position closest to the voice coil, the temperature is
the highest in the magnetic circuit.
[0014]
However, in the present magnetic circuit, since the openings are formed in the magnet and the
pot type yoke and the openings are in communication, the heat transmitted to the plate is
dissipated to the outside through the openings. Ru.
Thereby, the heat radiation efficiency of the magnetic circuit can be improved.
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[0015]
Further, by forming the opening in the magnet, it is possible to reduce the weight of the magnetic
circuit and hence the weight of the present speaker device. Since the opening is formed at the
center of the magnet, the magnetic flux density in the magnetic circuit is hardly reduced.
[0016]
Further, since the opening is formed in the magnet, when assembling the magnet and the plate of
the present speaker device, it is easy to visually check the application state of the adhesive
element between the magnet and the plate and the appropriateness of the drying state of the
adhesive element Can be confirmed. Therefore, when the adhesion state is poor, the magnet and
the plate are separated and reassembled in an appropriate state to improve the quality of the
magnetic circuit, and hence the quality of the speaker device. Can. In addition, if an opening is
also formed in the bottom of the pot type yoke, when the magnet and the pot type yoke are fixed
via the adhesive element, the adhesion between the lower surface of the magnet and the top
surface of the pot type yoke is visually observed through the opening. It can be confirmed more
easily. As a result, the quality of the magnetic circuit can be improved as described above.
[0017]
The opening formed in the pot type yoke can be used as a positioning hole when the pot type
yoke is attached to the frame. Further, it is used as a process of attaching various components in
the process S5 of FIG. 7 and the process S15 of FIG. FIG. 16 shows a jig G used in this process.
After attaching the frame 8 to the main body 52 of the yoke 5, when attaching various
components such as a damper, a diaphragm, a cap, a resin packing, etc. (not shown), the center
erected at the center of the disc G1 of the jig G Positioning is performed by inserting the
positioning pin G2 into the opening 51ab formed in the mounting portion 51a of the yoke 5.
When the disk G1 and the pin G2 rotate, the yoke 5 and the frame 8 are rotated to apply an
adhesive, and various components such as an edge are adhered. Therefore, by using the opening,
the pot type yoke can be attached to the frame with high accuracy, and the workability of the
attaching operation can be improved.
[0018]
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In one aspect of the above speaker device, the opening of the magnet has a size equal to or larger
than the opening formed in the bottom. Therefore, when driving the speaker device, it is possible
to improve the heat dissipation efficiency of the magnetic circuit.
[0019]
In another embodiment of the present invention, a speaker device includes a magnetic circuit
having a magnet, a pot type yoke having a bottom portion on which the magnet is mounted, and
a plate mounted on the magnet. An opening is formed in the plate.
[0020]
In the above speaker device, since the opening is formed in the plate, the heat transmitted from
the voice coil to the magnet can be efficiently dissipated through the opening when the speaker
device is driven.
[0021]
In one aspect of the above speaker device, an opening is formed in the magnet, and the opening
of the magnet communicates with the opening of the plate.
Further, in the other aspect of the above speaker device, an opening is formed in the pot type
yoke, and the opening of the pot type yoke is in communication with the opening of the plate and
the magnet.
According to these aspects, the heat dissipation efficiency of the magnetic circuit can be further
improved.
[0022]
In another aspect of the above speaker device, a thickness of the plate near the central axis
including the opening is thinner than a thickness of an outer peripheral portion. That is, the extra
thickness of the central portion of the plate is hollowed out so as not to affect the magnetic flux
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density of the magnetic circuit. Thus, the weight of the magnetic circuit can be reduced.
[0023]
In another embodiment of the present invention, in a method of manufacturing a speaker device,
the magnet and the plate are attached via an adhesive element in a state in which the flat magnet
and the central axis of the flat plate coincide with each other. The step of communicating the
adhesion between the magnet and the plate through the opening formed in the magnet, the
opening formed in the magnet, and the opening formed in the pot type yoke are communicated.
And bonding the lower surface of the magnet and the upper surface of the pot type yoke via an
adhesive element, and the adhesion between the magnet and the pot type yoke through an
opening formed in the pot type yoke. And b.
[0024]
According to the above-described method of manufacturing the speaker device, after the magnet
and the plate are attached via the adhesive element, the suitability of the application state of the
adhesive element and the dry state of the adhesive element is visually observed through the
opening formed in the magnet It can be confirmed more easily.
Therefore, when the adhesion state is inappropriate, the magnet and the plate are separated, and
the magnet and the plate are reassembled in the appropriate state again, thereby improving the
quality of the magnetic circuit and, consequently, the quality of the speaker device. Can be
improved.
[0025]
Further, in a state where the opening formed in the magnet and the opening formed in the pot
type yoke are communicated, the lower surface of the magnet and the upper surface of the pot
type yoke are adhered via an adhesive element. The propriety of the adhesion state of the
magnet and the pot type yoke can be easily checked visually through the opening formed in the
pot type yoke. Thus, the quality of the magnetic circuit and the like can be improved as described
above.
[0026]
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In another embodiment of the present invention, in a method of manufacturing a speaker device,
the magnet and the plate are attached via an adhesive element in a state in which the flat magnet
and the central axis of the flat plate coincide with each other. And a step of checking the
adhesion between the magnet and the plate through the opening formed in the plate, and the
lower surface of the magnet and the magnet in a state where the central axes of the magnet and
the pot type yoke are aligned. And bonding the upper surface of the pot type yoke via an
adhesive element, and checking whether the adhesion state of the magnet and the pot type yoke
is appropriate through an opening formed in the pot type yoke.
[0027]
According to the above-described method of manufacturing the speaker device, after the magnet
and the plate are attached via the adhesive element, the application state of the adhesive element
of the magnet and the plate and the dry state of the adhesive element are provided through the
opening formed in the plate Can be easily confirmed visually.
Therefore, when the adhesion state is inappropriate, the magnet and the plate are separated, and
the magnet and the plate are reassembled in the appropriate state again, thereby improving the
quality of the magnetic circuit and, consequently, the quality of the speaker device. Can be
improved.
[0028]
Further, the opening formed in the plate can be used as a positioning hole when the pot type
yoke is attached to the frame. Therefore, by using the opening, the pot type yoke can be attached
to the frame with high accuracy, and the workability of the attaching operation can be improved.
[0029]
Hereinafter, preferred embodiments of the present invention will be described with reference to
the drawings. The present invention is intended to improve the heat radiation efficiency of a
magnetic circuit and the like by providing an opening in the magnet and / or the plate.
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[0030]
[First Embodiment] In the speaker device according to the first embodiment of the present
invention, an opening is provided in the magnet to improve the heat radiation efficiency of the
plate having the highest temperature in the magnetic circuit system.
[0031]
1 and 2 schematically show the schematic configuration of a speaker device 100 according to a
first embodiment of the present invention.
The speaker device 100 according to the first embodiment can be suitably used as a vehiclemounted speaker. FIG. 1A shows a plan view of the speaker device 100. FIG. FIG.1 (b) has shown
sectional drawing along cutting-plane line A-A 'of the speaker apparatus 1 in Fig.1 (a). FIG. 2A
shows a rear view of the speaker device 100. FIG. FIG.2 (b) has shown the side view from the
arrow B direction of the speaker apparatus 100 in Fig.1 (a). Hereinafter, with reference to FIG. 1
and FIG. 2, the structure etc. of the speaker apparatus 100 of a present Example are
demonstrated.
[0032]
The speaker device 100 mainly includes a vibration system 10 having a frame 8, a diaphragm 1,
a damper 2, a voice coil bobbin 3 and a voice coil 4, a pot type yoke 5, a magnet 6, and the like
as shown in FIG. A magnetic circuit system 11 having a plate 7 and other various members are
provided. The speaker device 100 is a speaker device of a type generally called double voice or
dual voice, and can emit sound with a large volume of output.
[0033]
First, each component of the vibration system 10 will be described.
[0034]
The diaphragm 1 is a so-called cone-shaped diaphragm, and is bonded and joined to a separate
edge portion 1a, or is integrally formed with the edge portion 1a.
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Various materials such as paper-based, polymer-based, and metal-based can be applied to the
diaphragm 1 in accordance with various applications. The outer peripheral edge portion of the
diaphragm 1, that is, the lower end portion of the edge portion 1 a is fixed to the upper surface
of the outer peripheral edge portion of the frame 8. Since various components of the speaker
device 100 are fixed to the frame 8 and also serve to support the speaker device 100, it is
preferable to use a strong metal material. On the other hand, the inner peripheral edge portion of
the diaphragm 1 is fixed in the vicinity of the upper end of the outer peripheral wall of the voice
coil bobbin 3.
[0035]
The damper 2 is made of, for example, a cloth material in which a plurality of corrugations are
formed. In the speaker device 100 of this example, a plurality of dampers 2 are provided. Thus,
the voice coil bobbin 3 having a large driving force can be movably supported. The inner
peripheral edge of each damper 2 is fixed to the outer peripheral wall of the voice coil bobbin 3.
On the other hand, the outer peripheral edge of each damper 2 is fixed to the inner surface of the
frame 8.
[0036]
The voice coil bobbin 3 has an opening portion on the lower surface, and has a substantially
cylindrical shape. The voice coil 4 is wound around the outer wall of the lower end portion of the
voice coil bobbin 3. The outer peripheral wall of the lower end portion of the voice coil bobbin 3
is opposed to the inner peripheral wall of the pot type yoke 5 having an opening portion on the
upper surface at a constant distance. On the other hand, the inner peripheral wall of the voice
coil bobbin 3 is opposed to the outer peripheral wall of the plate 7 and the outer peripheral wall
of the flat plate magnet 6 slightly smaller than the flat plate 7 with a predetermined interval.
doing. Thus, an air gap (magnetic gap 20) is formed between the outer peripheral wall of the
plate 7 and the inner peripheral wall of the pot type yoke 5.
[0037]
The voice coil 4 is composed of two independent voice coils 4a and 4b (see FIG. 3). Electrical
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signals for two sets of one channel are input to the two voice coils from the amplifier side. For
example, when the speaker device 100 is used for L channel, the same L channel audio signal is
input to the two voice coils 4a and 4b. The voice coil 4 has two sets of plus / minus lead
terminals, and each lead terminal is electrically connected to the two sets of tinsel wires 9 at a
predetermined position of the diaphragm 1. The lead terminal on the positive side is an input
terminal for the L channel signal, and the lead terminal on the negative side is an input terminal
for the ground (GND: ground) signal.
[0038]
Next, each component of the magnetic circuit system 11 will be described.
[0039]
The magnetic circuit system 11 is configured as an internal magnet type magnetic circuit system.
The present magnetic circuit has a flat magnet 6, a flat plate 7 disposed so as to overlap the
upper part of the magnet 6, and a pot type yoke 5 for accommodating them. An opening 6 a is
formed at the center of the magnet 6. In the magnetic circuit system 11, the magnet 6 and the
plate 7 constitute a magnetic circuit, and the magnetic flux of the magnet 6 is concentrated in the
magnetic gap 20 formed between the outer peripheral surface of the plate 7 and the inner
peripheral surface of the pot type yoke 5. ing. The pot type yoke 5 is attached to the frame 8 in a
crimped state. Thereby, the magnet 6 and the plate 7 which are components of the magnetic
circuit system 11 are respectively held in a stable state. The detailed configuration of the
magnetic circuit system 11 including the magnet 6 will be described later.
[0040]
Next, various components will be described.
[0041]
The various components include members such as the dustproof cap 12, the packing 13, the
buffer member 14, and the wire harness 15.
[0042]
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11
The dustproof cap 12 has a dome shape.
The outer peripheral edge of the dustproof cap 12 is fixed in the vicinity of the inner peripheral
edge of the diaphragm 1.
Therefore, the dustproof cap 12 functions to prevent foreign matter such as dust from entering
the magnetic circuit system 11 or the like.
[0043]
The packing 13 is an annular member having an insulating property. As a material of packing 13,
materials, such as resin, are suitable, for example. The lower surface of the packing 13 is fixed to
the upper surface of the outer peripheral edge of the frame 8.
[0044]
The shock absorbing member 14 has a function as a shock absorbing material when attaching
the speaker device 100 to a predetermined position of the vehicle, and also has a function of
preventing transmission of external vibration to the main body of the speaker device 100. It is a
member. For this reason, as a material of the buffer member 14, for example, a member such as a
cushioning sponge is suitable. The buffer member 14 has a rod-like shape, and an adhesive is
applied on one side or a double-sided tape is attached. The buffer member 14 is attached to the
upper surface of the packing 13 via the adhesive or the double-sided tape in a state of being
deformed in an annular shape.
[0045]
The wire harness 15 is a four-wire wiring, and outputs an electric signal for one channel output
from the amplifier to the voice coil 4 via each tinsel wire 9. One end of the wire harness 15 is
connected to the connection terminal 16 by the solder 17, and the other end of the wire harness
15 is connected to the connector terminal 18. Thereby, the wire harness 15, the tinsel wire 9,
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and the voice coil 4 are electrically connected.
[0046]
Next, with reference to FIG. 3, a method of supplying an electrical signal to the speaker device
100 will be briefly described. Supply of the electrical signal to the speaker device 100 is
performed through the acoustic source 30, the amplifier 31, the amplifier 32, and the like. The
sound source 30 corresponds to a CD (Compact Disc) player, an MD (Mini Disc) player, or the
like. The sound source 30 outputs an audio signal for one L channel (or R channel) to the
amplifiers 31 and 32 (signal S1). For example, assuming that the speaker device 100 is used for
L channel, the amplifier 31 and the amplifier 32 amplify the output L channel audio signal at a
predetermined amplification factor, and via each tinsel wire 9 etc. , And output to each voice coil
4a and 4b. Therefore, the speaker device 100 can emit an output of a large volume.
[0047]
In the speaker device 100 described above, when an electric signal is input to the wire harness
15 from the amplifier side, the electric signal is transmitted to the voice coil 4 through the
connection terminal 16, the tinsel wire 9, and the lead terminal of the voice coil 4. Supplied. As a
result, a driving force is generated in the voice coil 4 in the magnetic gap 20, and the diaphragm
1 is vibrated in the axial direction of the speaker device 100. Thus, the speaker device 100
generates sound in the direction of the arrow 50 shown in FIGS. 1 (b) and 2 (b).
[0048]
[Configuration of Magnetic Circuit System 11 Including Magnet] Next, with reference to FIGS. 4
to 6, the configuration of the magnetic circuit system 11 including the magnet 6 capable of
improving the heat radiation efficiency of the plate 7 will be described in detail. Describe. FIG. 4
shows an enlarged sectional view of a portion of the region E1 in FIG. FIG. 5A shows a plan view
of the pot type yoke 5. FIG. 5 (b) shows a cross-sectional view of the pot type yoke 5 taken along
the line C-C 'in FIG. 5 (a). FIG. 6 shows a rear view of the frame 8.
[0049]
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As shown in FIG. 4, the pot type yoke 5 of the present invention is attached to the frame 8 in a
state where the plurality of convex portions 52c formed on the flange portion 52b are caulked by
a caulking jig not shown. There is. As a result, the magnet 6 and the plate 7 which are
components of the magnetic circuit system 11 are held in a stable state.
[0050]
First, prior to describing the configuration of the magnet 6 that characterizes the present
invention, the configuration of the pot type yoke 5, which is a component of the magnetic circuit
system 11, will be described in detail.
[0051]
The pot type yoke 5 has a bottom 51 and a main body 52, which are connected to each other.
[0052]
The bottom portion 51 has a cross-sectional shape in which the substantially concave shape is
reversed as shown in FIG.
The bottom portion 51 has a mounting portion 51a for mounting the magnet 6 and the plate 7,
an opening 51ab formed at the center of the mounting portion 51a, and an outer peripheral edge
portion connected to the inner peripheral edge portion 52d of the cylindrical portion 52a. And
51b, which are integrally formed.
The upper surface of the mounting portion 51a is a flat surface, and the diameter of the
mounting portion 51a is substantially the same as the diameter of the magnet 6 and the plate 7
as shown in FIG. Thus, the placement unit 51a places the magnet 6 and the plate 7 in a stable
state.
[0053]
The opening 51ab is used as a positioning hole when exactly caulking the caulking portion of the
convex portion 52c of the pot type yoke 5 on the frame 8 with a caulking jig. In addition, in the
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process of attaching the various components in the process S5 of FIG. 7 and the process S15 of
FIG. 13 as described above, it is used as an opening for positioning as shown in FIG. Therefore,
by using the opening 51ab, the pot type yoke 5 can be attached to the frame 8 with high
accuracy, and the workability of the attaching operation can be improved. In addition, after the
magnet 6 is attached to the pot type yoke 5 via the adhesive element in the manufacturing
process of the magnetic circuit system 11, the opening 51ab is in the coated state of the adhesive
element (for example, the adhesive element securely on the necessary part) Is used as a hole for
visually confirming the dry condition of the adhesive element, etc. Therefore, when the adhesion
state is defective, the magnet 6 and the pot type yoke 5 are separated and reassembled in an
appropriate state, thereby improving the quality of the magnetic circuit, and hence the quality of
the speaker device. It can improve.
[0054]
Further, in the present example, by forming the opening 51ab in the mounting portion 51a,
weight reduction of the pot type yoke 5 is achieved. Since the opening 51ab is formed at the
center of the magnet 6, the magnetic flux density of the magnetic circuit system 11 hardly
decreases.
[0055]
The main body portion 52 has a cylindrical portion 52a, a flange portion 52b, and a convex
portion 52c projecting upward from the upper surface of the flange portion 52b, and they are
integrally formed. The cylindrical portion 52a has a substantially cylindrical shape. The inner
peripheral edge 52 d of the cylindrical portion 52 a is connected to the outer peripheral edge 51
b of the bottom 51. As shown in FIGS. 4 and 5 (b), the cylindrical portion 52a extends upward
from a position near the inner peripheral edge 52d to a position near the plate 7, and the flange
portion 52b is a cylinder from that position. It extends outward substantially perpendicularly to
the portion 52a. Further, the flange portion 52b has a shape as shown in FIG. 5A in plan view,
has a predetermined area, and has a flat upper surface. The convex portion 52c has a cylindrical
shape, and a plurality of convex portions 52c are formed on the upper surface of the flange
portion 52b.
[0056]
On the other hand, as shown in FIG. 6, the frame 8 which is a component of the vibration system
10 has a flat region 8a (within the region of the broken line) where flatness is secured and a
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plurality of openings formed in the flat region 8a. It has 8b.
[0057]
In the pot type yoke 5 having such a configuration, as shown in FIG. 4, the convex portion 52 c is
caulked to the frame 8 by a caulking jig (not shown).
Thereby, the convex portion 52c is deformed, and the pot type yoke 5 is attached to the frame 8
in a state where the frame 8 is held between the deformed convex portion 52c and the upper
surface of the flange portion 52b. The upper surface of the flange portion 52 b of the pot type
yoke 5 is in close contact with the flat region 8 a of the frame 8.
[0058]
Therefore, in the speaker device 100 of the present invention, the coupling between the pot type
yoke 5 and the frame 8 is extremely strong, and the heavy magnetic circuit system 11 is held in a
stable state.
[0059]
As described above, in the speaker device 100 having the magnetic circuit system 11 including
the magnet 6 described above, the magnet 6 and the plate 7 are bonded and integrated by an
adhesive element such as an adhesive.
Furthermore, the integrated magnet 6 and plate 7 are fixed to the pot type yoke 5 by an adhesive
element. Thus, in the present speaker device 100, the magnet 6, the plate 7, the pot type yoke 5,
and the like constitute an internal magnetic type magnetic circuit system 11.
[0060]
When the speaker device 100 is driven, the voice coil 4 generates heat, which is transmitted to
the magnet 6 and the plate 7. At this time, since the plate 7 is disposed at a position closest to
the voice coil 4, the temperature is highest in the magnetic circuit system 11. However, in the
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present magnetic circuit system 11, the openings 6a and 51ab are respectively formed in the
magnet 6 and the pot type yoke 5, and the openings 6a and 51ab communicate with each other,
that is, the positions of the openings coincide. Therefore, the heat transferred to the plate 7 is
dissipated to the outside through the openings 6a, 51ab (see the arrow 66). Thus, the heat
radiation efficiency of the magnetic circuit system 11 can be improved.
[0061]
Further, by forming the opening 6 a in the magnet 6, it is possible to reduce the weight of the
magnetic circuit system 11 and, consequently, the weight of the speaker device 100. Since the
opening 6a is formed at the center of the magnet 6, there is almost no reduction in the magnetic
flux density of the magnetic circuit system 11.
[0062]
Further, since the opening 6a is formed in the magnet 6, when the magnet 6 of the present
speaker device 100 is assembled with the plate 7, the application state or adhesion of the
adhesive element between the magnet 6 and the plate 7 is made through the opening 6a. The
suitability of the dry state of the element can be easily confirmed visually. Therefore, when the
adhesion state is poor, the magnet 6 and the plate 7 are separated and reassembled in an
appropriate state, thereby improving the quality of the magnetic circuit system 11, and hence the
quality of the speaker device 100. Can be improved.
[0063]
Method of Manufacturing Speaker Device 100 Next, a method of manufacturing the speaker
device 100 will be described with reference to FIGS. 7 to 11. FIG. 7 shows a flowchart of a
method of manufacturing the speaker device 100. FIGS. 8 and 9 show an example of a
manufacturing process of the pot type yoke 5. FIG. 10 shows an example of the step of attaching
the pot type yoke 5 to the frame 8 (crimping step). FIG. 11A shows a plan view of a mounting jig
500 used when integrating the magnet 6 and the plate 7. FIG. 11B is a side view showing a state
before the magnet 6 and the plate 7 are integrated using the mounting jig 500. FIG. 11C is a side
view showing a state after the magnet 6 and the plate 7 are integrated by using the mounting jig
500.
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[0064]
First, the pot type yoke 5 is manufactured (step S1). Specifically, the body part 52 and the bottom
part 51 which are the component are manufactured separately, and the pot type | mold yoke 5 is
manufactured by connecting them after that. Such a manufacturing method will be described
with reference to FIGS. 8 and 9.
[0065]
FIG. 8A schematically shows the process of manufacturing the bottom portion 51 of the pot type
yoke 5. The bottom 51 is manufactured by forging a base material of a metal material such as
iron. Specifically, the base material 300 is made into a substantially concave cross-sectional
shape similar to that of the bottom 51 as shown in a process P14 by a plurality of forging
processes (P10 to P12). Then, in step P14, the outer peripheral edge portion 303 is cut, and the
outer peripheral edge portion 51b and the opening 51ab are formed. Thus, the bottom 51 is
manufactured.
[0066]
FIG. 8 (b) schematically shows the process of manufacturing the main body 52 of the pot type
yoke 5. The main body portion 52 is also basically manufactured by forging a metal base
material. Specifically, the base material 800 is formed into a substantially pot-shaped material
805 by a plurality of forging processes (P20 to P22) (see process P24). In this step P24, the
projection 52c is formed on the flange 52b by forging or by using a pair of molds M1 and M2
shown in FIG. 8 (c) or (d) (a first method of manufacturing the projection). . Then, in step P26, the
bottom portion 810 of the material 805 is punched out by press punching. Thereby, the bottom
portion 810 of the material 805 is separated as shown in step P26 of FIG. 8 (b).
[0067]
Next, in a process P28, cutting is performed on a portion (indicated by a broken line 820) where
the bottom portion 810 is punched out, and the bottom portion 51 is processed to be attachable.
Thus, as shown in process P28 of FIG. 8B, the main body 52 is manufactured.
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[0068]
Next, as shown in FIG. 9 (b), the manufactured main body 52 and the manufactured bottom 51
are connected. Specifically, the bottom 51 is press-fit into the main body 52 so that the inner
peripheral edge 52 d of the main body 52 and the outer peripheral edge 51 b of the bottom 51
corresponding to the position abut, and the lower end of the main body 52 The bottom portion
51 is fixed to the main body portion 52 by caulking the portion 825 (see the process P28 in FIG.
8B). Thus, the above-described pot type yoke 5 is manufactured.
[0069]
Next, a second method of manufacturing the convex portion will be described. FIG. 9A shows a
second method of manufacturing the convex portion 52c. In this method, the convex portion 52c
is formed simultaneously with the press punching process P26 of FIG. 8 (b). The state of this
punching process is schematically shown in FIG. 9 (a). In FIG. 9A, the material 805 with the
bottom 810 attached is held between the die 73 and the stripper plate 72, and the punch 71 is
moved in the direction of the arrow to punch the bottom 810. As a result, as shown in step P26
of FIG. 8B, the bottom portion 810 of the material 805 is separated, and the convex portion 52c
is formed. In the second method of manufacturing the convex portion 52c, the convex portion
52c is simultaneously formed on the flange portion 52b at the time of the punching process, and
therefore, as shown in FIG. 9A, the convex portion on the die 73 The stripper plate 72 is formed
with a recess 72a, as well as 73a. Therefore, when punching the bottom portion 810 from the
material 805, a plurality of convex portions 52c can be formed on the flange portion 52b.
[0070]
Next, a third method of manufacturing the convex portion will be described. In the third method
of manufacturing the convex portion 52c, the convex portion 52c is formed when the bottom
portion 51 is press-fit into the main body portion 52. That is, when the bottom portion 810 is
punched out from the step 526 shown in FIG. 8B, ie, the material 805, the convex portion 52c is
not formed, and the bottom portion 51 is press-fit into the main portion 52 as shown in FIG. At
this time, the convex portion 52c is not formed. When press-fitting the bottom portion 51 into
the main body portion 52, the convex portion 52c is simultaneously formed. Therefore, in the
case of forming the convex portion 52c by the second manufacturing method, the die 73 and the
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stripper plate 72 used in the punching process in the process P26 have the convex portion 73a
and the concave portion 72a as shown in FIG. It shall not be possessed.
[0071]
Next, returning to FIG. 7, the manufactured pot type yoke 5 is attached to the frame 8 (step S2).
Specifically, first, as shown in FIG. 10A, while the convex portion 52c of the pot type yoke 5 is
inserted into the opening 8b of the frame 8, the upper surface of the flange portion 52b of the
pot type yoke 5 and the frame 8 And the flat region 8a of the Next, as shown in FIG. 10A, while
lowering the caulking jig 400 from the upper position, the projection 402 for positioning is
inserted into the opening 51ab of the pot type yoke 5, and the projection 52c is formed.
Accurately position the crimped area on the top surface. As a result, the caulking portion on the
upper surface of the convex portion 52c comes into contact with the caulking blade 401 having a
conical tip.
[0072]
Next, as shown in FIG. 10 (b), the convex portion 52c is crimped to the frame 8 by the caulking
blade 401 while the caulking jig 400 is further lowered from the position. Next, as shown in FIG.
10C, the caulking jig 400 is retracted to the upper position. Thus, the pot type yoke 5 is attached
to the frame 8, and the frame 8 is held between the deformed convex portion 52c and the upper
surface of the flange portion 52b.
[0073]
Next, returning to FIG. 7, the magnet 6 and the plate 7 are integrated (step S3). Such a method
will be described with reference to FIG. As shown in FIG. 11A, the mounting jig 500 has an
opening 501, a first pedestal 502 on which the magnet 6 is mounted, and a second pedestal 504
on which the plate 7 is mounted. The opening 501 is used for positioning by inserting a
protrusion R1 erected at the central portion of the disk-shaped rotary table R shown in FIGS. 11B
and 11C into the opening 501. In addition, when the magnet 6 and the plate 7 are attached via
an adhesive element such as an adhesive, this is a hole for visually confirming the application
state of the adhesive element and the dry state of the adhesive element. However, without using
the opening 501, the adhesion state between the magnet 6 and the plate 7 can be visually
confirmed directly through the opening 6a of the magnet 6. The adhesive is applied while
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rotating the rotation table R to rotate the magnet 6.
[0074]
As shown in FIG. 11B, first, the magnet 6 is placed on the first pedestal 502 so that the rising
wall 503 of the mounting jig 500 is in close contact with a part of the side wall of the magnet 6.
Thus, the central axis of the opening 501 of the mounting jig 500 coincides with the central axis
of the magnet 6. Next, an adhesive element (not shown) is applied on the magnet 6. Next, the
plate 7 is mounted on the second pedestal 504 so that the rising wall 505 of the mounting jig
500 is in close contact with part of the side wall of the plate 7. Thereby, as shown in FIG. 11C,
the upper surface of the magnet 6 and the lower surface of the plate 7 are pasted in a state in
which the central axis of the opening 501, the central axis of the magnet 6, and the central axis
of the plate 7 coincide with each other. To be worn. Next, the integrated magnet 6 and plate 7
are taken out of the mounting jig 500.
[0075]
Next, it is visually confirmed through the opening 6 a of the magnet 6 whether or not the
application state of the adhesive element between the magnet 6 and the plate 7 is appropriate. At
this time, when the application state of the adhesive element is not good, the magnet 6 and the
plate 7 are separated, and the plate 7 and the magnet 6 are adhered again by the method
described above. Then, when the application state of the adhesive element is appropriate or when
it becomes appropriate, the dry state of the magnet 6 and the plate 7 is visually confirmed
through the opening 6 a of the magnet 6 after a predetermined time has elapsed. Then, the
bonding element is completely dried, and the magnet 6 and the plate 7 are integrated to
complete the present process.
[0076]
Next, returning to FIG. 7, the magnet 6 and the plate 7 in a state of being integrated in the pot
type yoke 5 are accommodated (step S4). Specifically, the integrated magnet 6 and the plate 7
are placed so that the upper surface of the mounting portion 51a of the manufactured pot type
yoke 5 and the lower surface of the magnet 6 are in contact with each other. The lower surface
and the upper surface of the mounting portion 51a are fixed by an adhesive element. At this
time, the gap (gap) of the magnetic gap 20 formed between the magnet 6 and the plate 7
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integrated with the gap type yoke 5 with a gap gauge not shown is made constant over the entire
circumference. Then, the application state of the adhesive element between the lower surface of
the plate 7 and the upper surface of the mounting portion 51a is visually confirmed through the
opening 51ab of the pot type yoke 5. At this time, if the application state of the adhesive element
is not good, the integrated magnet 6 and plate 7 are separated again from the pot type yoke 5,
and the adhesive element is applied again to the mounting portion 51a. Then, the integrated
magnet 6 and the plate 7 are fixed again to the upper surface of the mounting portion 51 a of the
pot type yoke 5 via an adhesive element. Then, when the application state of the adhesive
element is appropriate or when it becomes appropriate, after an elapse of a predetermined time,
the plate 7 and the mounting portion 51 a of the pot type yoke 5 through the opening 51 ab of
the pot type yoke 5. The dry condition of the adhesive element with is visually confirmed. Then,
the bonding element is completely dried, and the integrated process of the integrated process is
completed by completely fixing the integrated magnet 6 and plate 7 and the mounting portion
51 a of the pot type yoke 5.
[0077]
Next, various components of the speaker device 100 are attached to the frame 8 or the like (step
S5). Thus, the speaker device 100 shown in FIGS. 1 and 2 is manufactured.
[0078]
Second Embodiment In a speaker device according to a second embodiment of the present
invention, an opening is provided in a plate to improve the heat radiation efficiency of a magnet
which is a component of a magnetic circuit system.
[0079]
FIG. 12A schematically shows a cross-sectional view of a speaker device 600 according to a
second example of the present invention.
The speaker device 600 of the second embodiment can be suitably used as a vehicle-mounted
speaker, as in the speaker device 100 of the first embodiment. FIG.12 (b) shows the sectional
view which expanded the part of area | region E2 in Fig.12 (a). Hereinafter, with reference to
FIGS. 12 (a) and 12 (b), description will be made focusing on the specific configuration, effects,
and the like of the speaker device 600 of the present embodiment. In the following, the same
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components as those of the speaker device 100 according to the first embodiment are given the
same reference numerals, and the description thereof is omitted.
[0080]
The following points differ when the speaker apparatus 100 of 1st Example and the speaker
apparatus 600 of 2nd Example are compared. That is, in the former, the opening 6 a is formed at
the center of the magnet 6, but in the latter, the opening is not formed in the magnet 26. Also,
the former has no opening in the plate 7, but the latter has an opening 27 a in the center of the
plate 27.
[0081]
Therefore, the speaker device 600 of the second embodiment has the following effects. That is,
when the speaker device 600 is driven, heat is generated in the voice coil 4, and the heat is
transmitted to the magnet 26 and the plate 27. Then, the heat transmitted to the magnet 26 is
dissipated to the outside through the opening 27 a of the plate 27 and the opening 51 ab of the
pot type yoke 5 (see the arrow 67). Thereby, the heat radiation efficiency of the magnet 26,
which is a component of the magnetic circuit system, can be improved. In the speaker device
600, although the opening is not formed in the magnet 26, the opening may be formed in the
magnet 26. Thereby, the opening 51ab of the pot type yoke 5, the opening of the magnet 26, and
the opening 27a of the plate 27 communicate with each other, and the heat radiation efficiency
of the magnetic circuit system can be further improved.
[0082]
Further, at the time of assembling the plate 27 and the magnet 26, the following effects can be
obtained. That is, the plate 27 and the magnet 26 are attached via an adhesive element. At this
time, since the opening 27a is formed in the plate 27, the application state of the adhesive
element between the magnet 26 and the plate 27 and the drying state of the adhesive element
can be easily confirmed visually through the opening 27a. Therefore, when the adhesion state is
improper, the magnet 26 and the plate 27 can be separated, and the magnet 26 and the plate 27
can be reassembled in an appropriate state. Thereby, the quality of the magnetic circuit system
can be improved, and the quality of the speaker device 600 can be improved.
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[0083]
Furthermore, since the openings 27a are formed in the plate 27, the following effects can be
achieved. That is, when the pot type yoke 5 is attached to the frame 8, by inserting the
positioning projection part 402 of the caulking jig 400 into the opening 27 a of the plate 27, the
caulking part of the convex part 52 c of the pot type yoke 5 is accurately It can be positioned. As
a result, the pot type yoke 5 can be crimped to the frame 8 with high accuracy, and the
workability of the mounting operation can be improved.
[0084]
Method of Manufacturing Speaker Device 600 Next, a method of manufacturing the speaker
device 600 will be described with reference to FIGS. 13 and 14. In the following, the steps
common to the method of manufacturing the speaker device 100 according to the first
embodiment will be described in a simplified manner. FIG. 13 shows a flowchart of a method of
manufacturing the speaker device 600. FIG. 14 shows an example of a process (crimping
process) of attaching the pot type yoke 5 to the frame 8.
[0085]
First, the pot type yoke 5 is manufactured by the same method as the first embodiment (step
S11). Next, the magnet 26 and the plate 27 are integrated (step S12). Specifically, the magnet 26
and the plate 27 are attached via the adhesive element using the mounting jig 500 described
above. Thereby, the magnet 26 and the plate 27 are integrated in a state in which the central axis
of the magnet 26 and the central axis of the plate 27 coincide with each other.
[0086]
Next, the integrated magnet 26 and plate 27 are accommodated in the pot type yoke 5 in the
same manner as in the first embodiment (step S13). Next, the pot type yoke 5 is attached to the
frame 8 (step S14). Specifically, first, as shown in FIG. 14A, while the convex portion 52c of the
pot type yoke 5 is inserted into the opening 8b of the frame 8, the upper surface of the flange
portion 52b of the pot type yoke 5 and the frame 8 And the flat region 8a of the Next, as shown
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in FIG. 14A, the positioning projection 452 is inserted into the opening 27a of the plate 27 while
lowering the caulking jig 450 from the upper position, and Accurately position the crimped part.
As a result, the caulking portion on the upper surface of the convex portion 52c comes into
contact with the caulking blade 451 having a conical tip.
[0087]
Next, as shown in FIG. 14B, while further lowering the caulking jig 450 from the position, the
caulking blade 451 caulks the projection 52 c to the frame 8. Next, as shown in FIG. 14C, the
caulking jig 450 is retracted to the upper position. Thus, the pot type yoke 5 is attached to the
frame 8, and the frame 8 is held between the deformed convex portion 52c and the upper
surface of the flange portion 52b.
[0088]
Next, various components of the speaker device 600 are attached to the frame 8 and the like
(step S15). Thus, the speaker device 600 shown in FIG. 12A is manufactured.
[0089]
[Modified Example] In the above speaker device 600, only the opening 27a is formed at the
center of the plate 27. In addition to this, in order to further reduce the weight of the magnetic
circuit system, the excess thickness of the plate 27 may be hollowed out to such an extent that
the magnetic flux density of the magnetic circuit system does not decrease. FIG. 15A shows a
plan view of the plate 277 in a state where the extra thickness has been removed. FIG. 15 (b)
shows a cross-sectional view of the plate 277 shown in FIG. 15 (a) along the cutting line D-D '.
[0090]
As shown in FIGS. 15A and 15B, the plate 277 is formed with an opening 277a at its center.
Further, as shown in a region E3 of FIG. 15 (b), the plate 277 has an excess thickness of a shape
in which the shape of a truncated cone is inverted in cross section is cut out. That is, the central
portion of the plate 277 is hollowed out so that the thickness in the vicinity of the central axis of
13-05-2019
25
the plate 277 becomes thinner than the thickness on the outer peripheral side. By thinning the
vicinity of the central axis of the flat plate 277 in this manner, the weight of the plate 277 can be
reduced without decreasing the magnetic flux density. Therefore, when the plate 277 is applied
to the magnetic circuit system of the speaker device 600, the weight of the magnetic circuit
system can be reduced, and hence the weight of the speaker device 600 can be reduced.
[0091]
The top view and sectional drawing of the speaker apparatus based on 1st Example of this
invention are shown. The back view and side view of the speaker apparatus based on 1st
Example of this invention are shown. The block diagram shows a method of supplying an
electrical signal to the speaker device. The sectional view which expanded the joint state of a pot
type yoke and a frame is shown. The top view and sectional drawing of a pot type yoke are
shown. A rear view of the frame is shown. The flowchart of the manufacturing method of the
speaker apparatus which concerns on 1st Example is shown. Sectional drawing of the
manufacturing process of a pot type | mold yoke is shown typically. Sectional drawing of the
manufacturing process of a pot type | mold yoke is shown typically. Sectional drawing of the
process of caulking the convex part of a pot type | mold yoke on a flame | frame is shown
typically. The top view etc. of the mounting jig which unifies a magnet and a plate are shown. The
top view etc. of the speaker apparatus based on 2nd Example of this invention are shown. The
flowchart of the manufacturing method of the speaker apparatus which concerns on 2nd
Example is shown. Sectional drawing of the process of caulking the convex part of a pot type |
mold yoke on a flame | frame is shown typically. The top view and sectional drawing of the plate
which has the form which excess thickness was hollowed out are shown. A cross section
including a jig of a process of attaching various parts to a magnetic circuit and a frame is shown
typically.
Explanation of sign
[0092]
DESCRIPTION OF SYMBOLS 5 pot type yoke 6, 26 magnet 7, 27, 277 plate 8 frame 10 vibration
system 11 magnetic circuit system 51 bottom 52 main body 8a flat area 8b opening 52a
cylindrical part 52b flange 52c convex part 100, 600 speaker device 200 press Device 400, 450
Jig for attachment 500 Jig for attachment
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