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JP2016010019

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DESCRIPTION JP2016010019
An object of the present invention is to provide a "speaker device" having a structure capable of
efficiently radiating heat generated by a voice coil. A voice coil (27) is wound around a case body
(15), a magnetic circuit (25) fixed inside the case body (15), and a cylindrical bobbin (28) and
disposed in a gap (26) formed in the magnetic circuit (25). And the diaphragm 31 whose inner
peripheral edge portion is connected to the bobbin 28 and whose outer peripheral edge portion
is connected to the case body 15 so as to partition the inside of the case body 15; A portion of
V.sub.x is located outside the gap 26. [Selected figure] Figure 1
Speaker device
[0001]
The present invention relates to a speaker device having a structure in which a voice coil wound
around a bobbin is disposed in a gap of a magnetic circuit.
[0002]
BACKGROUND Conventionally, a speaker device disclosed in Patent Document 1 is known.
This speaker device is characterized in that the outer peripheral wall accommodating the
magnetic circuit including the magnet, the yoke and the like is formed in a streamlined and
curved shape, and by adopting such a shape, the speaker device When the air present on the
back side flows to the diaphragm side, the air resistance in the vicinity of the outer peripheral
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wall of the magnetic circuit housing can be reduced. As a result, the flow of air becomes smooth,
and the sound quality can be prevented from being degraded, and the heat radiation from the
outer peripheral wall can be promoted.
[0003]
JP, 2006-229520, A
[0004]
The heat source for heat radiation from the outer peripheral wall described above is a voice coil
located in the gap formed in the magnetic circuit, and the heat generated by energization of the
voice coil is transmitted from the magnetic circuit housing to the internal space of the speaker
device through the yoke. Heat is dissipated.
[0005]
However, since the voice coil is disposed in the gap so as not to directly touch the yoke, the air
located between the voice coil and the yoke functions as a heat insulating layer, and the heat
generated by the voice coil is the outer periphery of the magnetic circuit housing. It is not
possible to dissipate heat efficiently from the wall.
When the voice coil is in an overheated state exceeding a predetermined temperature, the voice
coil may be disturbed and the speaker device may be broken.
[0006]
The present invention has been made in view of such circumstances, and an object of the present
invention is to provide a speaker device having a structure capable of efficiently radiating heat
generated by a voice coil.
[0007]
A speaker device according to the present invention includes a case body, a magnetic circuit fixed
inside the case body, and a voice coil wound around a cylindrical bobbin and disposed in a gap
formed in the magnetic circuit. And a diaphragm having an inner peripheral edge connected to
the bobbin and an outer peripheral edge connected to the case body so as to partition the inside
of the case body, wherein a part of the voice coil is It is a structure located in the exterior of the
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said gap.
[0008]
According to such a configuration, since a part of the voice coil is provided outside the gap, the
heat generated by the voice coil in the gap is dissipated from the yoke through the air layer in
the gap. In addition to the above, the voice coil located outside the gap can radiate heat directly
to the surrounding air, and it touches the air that flows through it by the vibration of the
diaphragm, so the cooling effect of the speaker device including the voice coil, magnetic circuit,
etc. improves.
[0009]
In the speaker device according to the present invention, when the voice coil is energized, a part
of the voice coil may be located outside the gap.
[0010]
According to such a configuration, when the voice coil is energized, a part of the voice coil is
located outside the gap. Therefore, when heat is generated from the voice coil due to the
energization, the part of the voice coil always runs around the outside of the gap. The heat can be
dissipated directly to the air, and the air flowing through the vibration of the diaphragm further
improves the cooling effect of the entire speaker device.
[0011]
In the speaker device according to the present invention, the diaphragm may be connected to the
bobbin such that the inner peripheral edge portion protrudes to the side opposite to the
magnetic circuit.
[0012]
According to such a configuration, since the inner peripheral edge portion of the diaphragm
projects to the side opposite to the magnetic circuit, the diaphragm and the bobbin intersect with
each other at an acute angle, as compared with the case where they intersect at an obtuse angle.
The flow of air due to the vibration of the diaphragm is stronger and directly hits a part of the
voice coil located outside the gap, so that the cooling effect of the speaker device is further
improved.
[0013]
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In the speaker device according to the present invention, the inside of the case body partitioned
by the diaphragm is opened in the case body so that the inside on the side where the magnetic
circuit is provided communicates with the outside of the case body. It can be set as the structure
in which the part was formed.
[0014]
According to such a configuration, the opening is formed in the case body so that the inside of
the case body on the side where the magnetic circuit is provided communicates with the outside
of the case body. Since the outside air can be introduced from the opening into the side provided
with the magnetic circuit, the heat radiation from the portion of the voice coil located outside the
gap can be promoted, and the cooling effect of the speaker device can be further improved. .
[0015]
In the speaker device according to the present invention, the opening of the case body may be
formed to cover at least a part of the magnetic circuit.
[0016]
According to such a configuration, the outside air taken in from the opening of the case body can
be made to directly touch the portion of the voice coil located outside the gap as the shortest air
flow, so that a further cooling effect can be obtained. Can.
[0017]
According to the speaker device of the present invention, since part of the voice coil is located
outside the gap, heat generated by the voice coil in the gap is dissipated outside the gap in
addition to heat radiation from the yoke via the air layer. Can be dissipated directly to the air in
the surrounding space outside the gap from the portion of the voice coil located at the bottom of
the gap, and it can touch the flowing air by the vibration of the diaphragm, thereby improving
the cooling effect of the speaker device including the voice coil .
[0018]
FIG. 1 is a cross-sectional view showing a cross-sectional structure of a speaker device according
to an embodiment of the present invention.
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It is explanatory drawing which shows the flow of the external air in an apparatus for cooling of
the speaker apparatus shown in FIG.
[0019]
Embodiments of the present invention will be described using the drawings.
[0020]
The speaker device according to the embodiment of the present invention is configured as shown
in FIG.
[0021]
As shown in FIG. 1, the speaker device 11 has a box-shaped first case body 12 and a second case
body 13 each having a substantially circular bottom portion and a wall portion rising from the
periphery of the bottom portion. It has a case body 15 which locks the end edges to form an
internal space.
At the center of the bottom of the first case body 12, a port 16 having a circular opening 16a and
a wall 16b projecting outward from the periphery of the opening is formed.
Further, a circular opening 17 is formed at the center of the bottom of the second case body 13.
[0022]
A cylindrical outer yoke 21 having a bottom on the side of the opening 16 is fixed at
substantially the center of the opening 16a of the port 16 by a fixture 20 provided at a
predetermined pitch on the wall 16b of the port 16 .
The fixing tool 20 is a substantially L-shaped fitting piece, and the outer yoke 21 is fixed to the
wall portion 16b by a plurality of fixing tools 20 at a predetermined interval.
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Thereby, the outer yoke 21 is fixed in a state where the bottom side thereof is positioned in the
port portion 16.
[0023]
Inside the outer yoke 21, the plate 22, the magnet 23 and the inner yoke 24 are stacked in order
from the bottom, and a gap is a gap between the plate 22, the magnet 23 and the inner yoke 24
and the outer yoke 21. 26 are formed.
A magnetic circuit 25 is constituted by the outer yoke 21, the plate 22, the magnet 23 and the
inner yoke 24 described above.
[0024]
Inside the case body 15, a diaphragm 31 made of conical cone paper or the like having a circular
opening at the top, an edge portion 31 provided at the outer peripheral edge portion thereof is a
first case body 12 and a second case body 13 In the position where the end edges of the two are
engaged, they are fixed in a sandwiched state.
The diaphragm 31 is arranged such that the top portion forming the opening of the diaphragm
31 protrudes toward the opening 17 of the second case body 13 on the opposite side to the
magnetic circuit 25 by fixing at the above-described position. It is done.
Therefore, the diaphragm 31 is provided so that the top including the inner peripheral edge than
the outer peripheral edge protrudes to the opposite side to the magnetic circuit 25.
The inside of the case body 15 is partitioned by the diaphragm 31 into a first space 35 a on the
first case body 12 side and a second space 35 b on the second case body 13 side.
Further, a damper 32 which is a member such as a synthetic resin or cloth formed in a ring
shape having a circular opening at the center is fixed to the peripheral edge of the opening 17 of
the second case body 13 at its outer peripheral edge. .
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[0025]
In the gap 26 formed in the magnetic circuit 25, a cylindrical (cylindrical) bobbin 28 having a
circular cross section and the voice coil 27 wound around one end is disposed at a
predetermined position in the gap 26. To be inserted.
The voice coil unit 29 is configured by the voice coil 27 and the bobbin 28.
The inner peripheral edge (the edge of the opening) of the diaphragm 31 and the inner
peripheral edge (the edge of the opening) of the damper 32 are fixed to the other end of the
bobbin 28.
Thus, the inner peripheral edge portions of the voice coil unit 29 and the diaphragm 31 are
elastically supported by the damper 32 so as to be able to vibrate in the axial direction
(longitudinal direction) of the bobbin 28.
[0026]
The voice coil unit 29 is elastically supported by the damper 32 so as to be able to vibrate in the
axial direction of the bobbin 28 and when the voice coil 27 generating the vibration is energized,
the voice coil 27 always has a gap It is provided to be located outside 26.
The portion of the voice coil 27 located outside the gap 26 is placed in a position to be in direct
contact with the air in the first space 35 a partitioned by the first case body 12 and the
diaphragm 31.
[0027]
A filter 37 is attached to a tip opening on the outer side of the port portion 16 provided in the
first case body 12, and the filter removes dust from outside air taken into the first space 35a.
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In addition, a terminal 41 electrically connected to the outside of the speaker device 11 is
provided on the outer surface of the first case body 12, and the lead wire 42 connected to the
voice coil 27 is a first space from the first space 35a. It is connected to the terminal 41 through
the case body 12.
[0028]
A lid-like cap 38 is fixed to the end of the other end opposite to the one end of the bobbin 28
around which the voice coil 27 is wound, and seals the inside of the bobbin 28. Further, in order
to seal the opening 17 of the second case body 13, a lid-like cover member 39 is fixed to the
outer surface of the second case body 13 so as to cover the entire opening 17.
[0029]
Next, the operation of the speaker device 11 according to the embodiment of the present
invention will be described with reference to FIG. FIG. 2 is an explanatory view showing the flow
of the outside air in the device at the time of operation of the speaker device 11 (during vibration
by energization).
[0030]
As shown in FIG. 2, in the speaker device 11, when the current according to the sound signal
flows to the voice coil 27 through the terminal plate 41 and the lead wire 42, the current flowing
to the voice coil 27 and the gap 26 of the magnetic circuit 25. The voice coil unit 29 (voice coil
27 and bobbin 28) vibrates in the axial direction (longitudinal direction) of the bobbin 28 by the
electromagnetic action with the magnetic field formed on the diaphragm, and is further fixed to
the end of the bobbin 28 31 also vibrates in the axial direction of the bobbin 28 (direction F
shown in FIG. 2) to emit a predetermined sound.
[0031]
The vibration of the bobbin 28 in the axial direction (longitudinal direction) by the diaphragm 31
causes the flow of the outside air from the opening 16a of the port portion 16 provided in the
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first case body 12 in addition to the generation of the sound corresponding to the electrical
signal. Promote (shown by dashed line B in FIG. 2).
When the diaphragm 31 swings to the second case body 13 side, a pressure drop occurs in the
first space 35a partitioned by the diaphragm 31, and outside air is taken in from the opening 16a
of the port portion 16 (broken line B in FIG. 2). When the diaphragm 31 swings to the first case
body 12 side, the pressure in the first space 35a increases, and the air in the first space 35a
flows to the opening 16a of the port portion 16). Exhaust from Accordingly, due to the vibration
of the diaphragm 31, the exchange of air with the outside air through the opening 16a of the
port 16 is actively performed in the first space 35a.
[0032]
In particular, in the diaphragm 31 of the present embodiment, as described above, the top of the
diaphragm 31 where the opening (inner peripheral edge) is formed is on the opposite side of the
magnetic circuit 25 in the second case body 13 Since it is arranged to project toward the opening
17 side, the angle between the diaphragm 31 and the peripheral wall of the bobbin 28 is smaller
than 90 ° (acute angle) and is larger than 90 ° (obtuse angle). In comparison, since the first
space 35a is a narrow space, the first space 35a is susceptible to a pressure change due to the
vibration of the diaphragm 31, and the flow velocity of air due to the vibration increases. The air
(outside air) flowed from the outside into the first space 35a by the opening 16a of the port
portion 16 can directly contact the magnetic circuit 25 and the voice coil unit 29 as shown in
FIG. Shows the flow path of the outside air). In particular, in the space in the vicinity where the
diaphragm 31 and the voice coil unit 29 are connected, the inflowing external air loses a place to
go and is susceptible to the vibration by the diaphragm 31, and the voice coil 27 located outside
the gap 26. Will be in direct contact with
[0033]
Therefore, when the voice coil 28 is energized, that is, when the diaphragm 31 vibrates, the voice
coil 28 serving as a heat source is located outside the gap 26 because a part of the voice coil 28
is located outside the gap 26. Since the portion located at can directly contact the flowing outside
air by the vibration of the diaphragm 31, heat radiation is promoted more than the portion
located within the gap 26. The heat generated in the voice coil 28 located in the gap 26 is
transferred to the outer yoke 21 through the air layer in the gap 26 and dissipated from the
outer yoke 21 into the first space 35a. The outer surface of the yoke 21 is also in contact with
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the outside air flowing from the opening 16 a of the port portion 16, so the heat radiation effect
is improved.
[0034]
Regarding the jet flow average velocity Vp in the first space 35 a of the above-mentioned outside
air, the area Sd of the diaphragm 31, the sectional area Sp of the opening 16 a of the port portion
16, and the average vibration velocity Vd of the diaphragm 31 There is a relationship of Vp = Sd
÷ Sp × Vd (hereinafter abbreviated as Sd / Sp * Vd as appropriate). The cooling effect
increases as the jet average velocity Vp is maximized, but the noise increases as the jet velocity
increases, and the so-called S / N ratio deteriorates. Therefore, the jet average velocity Vd is
limited by the S / N ratio. It is thought that the distance between the magnetic circuit 25 and the
port portion 16 also affects the use of the jet flow by the outside air for cooling, but if the jet flow
average velocity Vd is about twice the average vibration velocity Vd of the diaphragm 31, the
cooling effect Therefore, Sd / Sp is set to be 2 times or more.
[0035]
In the present embodiment, when the voice coil 27 is energized, a part of the voice coil 27 is
located outside the gap 26. Therefore, when the voice coil 27 generates heat, a part of the voice
coil 27 is vibrated by the vibration of the diaphragm 31. It is possible to directly touch the
discharged outside air to dissipate heat, and, together with the heat dissipation from the
magnetic circuit 25, it is possible to improve the cooling effect by the heat dissipation as the
entire speaker device.
[0036]
In the present embodiment, when the voice coil 27 is energized (when the diaphragm 31
vibrates), a part of the voice coil is located outside the gap 26, but it is located outside the gap
26. The ratio of the portion to the entire voice coil 27 can be determined in consideration of the
heat radiation efficiency, the influence on the sound quality of the speaker device 11, and the
like.
Also, the diaphragm 31 is disposed so that the top of the conical shape protrudes on the opposite
side to the magnetic circuit 25, but as described above, the intake of the outside air due to the
vibration of the diaphragm 31 is made more effective. It is to do. Even if the top of the diaphragm
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31 is projected to the magnetic circuit 25 side, a part of the voice coil 27 is provided outside the
gap 26. Therefore, although it does not correspond to the present embodiment, it has a certain
degree. A cooling effect can be obtained.
[0037]
Further, in the present embodiment, since the entire magnetic circuit 25 is covered by the port
portion 16 provided in the first case body 12, the outside air flows through the entire magnetic
circuit 25 and the voice coil unit 29 to promote the cooling effect. However, even when a portion
of the magnetic circuit 25 is covered by the port portion 16, a portion of the voice coil 27 is
provided outside the gap 26, so that a predetermined cooling effect can be obtained. it can.
[0038]
As described above, the speaker device according to the present invention can directly dissipate
the heat generated by the voice coil to the air around the outside of the gap, and can improve the
cooling effect of the voice coil. It is useful as a heat dissipation structure of a superior dynamic
type speaker device.
[0039]
DESCRIPTION OF SYMBOLS 11 Speaker apparatus 12 1st case body 13 2nd case body 15 Case
body 16 Port part 16a Opening part (port part) 16b Wall part 17 Opening part (2nd case body)
21 Outer yoke 22 Plate 23 Magnet 24 Inner yoke 25 Magnetic Circuit 26 Gap 27 Voice coil 28
Bobbin 29 Voice coil unit 31 Diaphragm 32 Damper 38 Cap 39 Cover member
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