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JPH08168090

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JPH08168090
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
loudspeaker apparatus provided with an electrodynamic loudspeaker unit.
[0002]
2. Description of the Related Art In recent years, with the increase in output of audio amplifiers, it
has been required that a speaker apparatus used particularly for business use has high input
tolerance and high output.
[0003]
A conventional speaker apparatus of this type will be described below with reference to the
drawings.
FIG. 5 is a cross-sectional view showing the structure of the conventional speaker device, in
which 1 is a center pole portion, 2 is a lower plate provided with the center pole portion 1, and 3
is an upper surface of the lower plate 2. A ring-shaped magnet 4 which is coupled and
magnetized in the thickness direction is coupled to the upper surface of the magnet 3 and has an
inner circumferential surface forming a magnetic gap with the outer circumferential surface of
the center pole portion 1 A top plate, 5 is a frame coupled to the top surface of the top plate 4, 6
is a voice coil held in the magnetic gap and swings according to an electrical signal, 7 is a voice
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coil bobbin on which the voice coil 6 is wound, 8 Is a damper whose inner and outer peripheral
portions are respectively connected to the middle part of the voice coil bobbin 7 and the middle
part of the frame 5; 9 is a diaphragm connected to the upper part of the voice coil bobbin 7; An
outer peripheral portion is an edge connected to an outer peripheral portion of the diaphragm 9
and an outer peripheral portion of the frame 5, a gasket 11 is connected to an upper surface of
the edge 10, and 12 covers an upper portion of the voice coil bobbin 7. The dust cap 13 is a
speaker box in which a speaker is connected to the front by being connected to the frame 5.
[0004]
However, in the speaker device of the above-described conventional configuration, when a large
input is applied to the speaker and a large current flows in the voice coil 6, the voice coil 6
generates heat and is generated in the voice coil 6. Heat is mainly transmitted to the center pole
portion 1 through air in a space sandwiched between the outer peripheral surface of the center
pole portion 1 and the inner peripheral surface of the voice coil bobbin 7, and the inner
peripheral surface of the upper plate 4 and the outer periphery of the voice coil 6 It is cooled by
transmitting it to the upper plate 4 through the air of the space sandwiched by the surfaces, and
it is also cooled by air movement in the space formed by the inner peripheral surface of the
upper plate 4 and the outer peripheral surface of the voice coil 6 Although the thermal
conductivity of air is low, the space surrounded by the inner peripheral surface of the upper plate
4 and the outer peripheral surface of the voice coil 6 is a very narrow gap. Ventilation is
insufficient in order, the heat of the voice coil 6 had a problem of not being sufficiently cooled.
[0005]
Therefore, the resistance of the voice coil 6 increases due to heat generation and the current
decreases, so that the output sound pressure corresponding to the electrical input can not be
obtained, and if the temperature of the voice coil 6 becomes high, the insulating film of the voice
coil 6 Cause short circuiting, and voice coil 6 peels between wires and voice coil bobbin 7
causing abnormal noise and disconnection due to collision with magnetic gap, or voice coil 6
itself burns out and leads to disconnection. I had the problem of fear.
[0006]
An object of the present invention is to solve such conventional problems, and to provide a
speaker device capable of coping with high input resistance and large output with reduced
temperature rise of the voice coil.
[0007]
SUMMARY OF THE INVENTION In order to solve the above problems, the speaker device of the
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present invention comprises an annular magnetic gap formed in the magnetic circuit of the first
speaker unit coupled to the front of the speaker box. The first air vent is formed by this notch
and the outer peripheral surface of the voice coil, and the second air vent is made so that the
space part where this magnetic gap is formed will be in an inserted state with the outside. The
magnetic circuit and the frame of the first speaker unit are provided by providing the first vent
pipe connecting the entire second back surface of the second speaker unit coupled to the back
surface of the speaker box and the second vent hole. A first space portion surrounded by the
voice coil bobbin and the damper, a first air hole, a second space portion formed inside the
magnetic circuit of the first speaker unit, and a second air hole; 1 of the vent pipe is obtained by
the structure forming the first vent passage communicating respectively.
[0008]
With this configuration, the air flow generated with the vibration of the second speaker unit
passes through the outer peripheral surface of the voice coil of the first speaker unit to cool the
voice coil, so the temperature of the voice coil at the time of large input The rise can be reduced
and the rise in resistance of the voice coil can be mitigated.
[0009]
Embodiment 1 Hereinafter, a first embodiment of the present invention will be described with
reference to the drawings.
[0010]
FIGS. 1 and 2 are sectional views showing the structure of the speaker device according to the
same embodiment and the details of the magnetic circuit portion of the first speaker unit used in
the embodiment, and 14 in the drawings is the present embodiment. The first speaker unit,
which is the main sound source of the speaker device according to the example, 15 is a center
pole portion, 16 is a lower plate provided with the center pole portion 17, and 17 is a ring
magnet coupled to the upper surface of the lower plate 16. , 18 is a ring-shaped upper plate
which is coupled to the upper surface of the ring-shaped magnet 17 and whose inner
circumferential surface forms a magnetic gap with the outer circumferential surface of the center
pole portion 15; 19 is the upper surface of the upper plate 18; 20 is a voice coil which fits into
the magnetic gap, 21 is a voice coil bobbin on which the voice coil 20 is wound, and 22 is a voice
coil. The damper 23 has an inner peripheral portion coupled to the coil bobbin 21, the
diaphragm 23 has an inner peripheral portion connected to the voice coil bobbin 21, an edge 24
connected to the outer peripheral portion of the diaphragm 23, and 25 an edge of the edge 24. A
gasket 26 is connected to the upper surface of the outer peripheral portion, a dust cap 26 is
connected to the upper surface of the central portion of the diaphragm 23, a speaker box 27 is
connected to the first speaker unit 14 on the front, and 28 is the upper plate 18 A first vent hole
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provided by cutting out the inner peripheral portion, a second vent hole 29 provided through the
lower plate 16, and a third vent hole 30 for cooling the first speaker unit 14. A second speaker
unit 31 coupled to the rear surface side of the speaker box 27 is provided between the second
vent hole 29 and the rear surface of the second speaker unit 30. 1, a first air space 32
surrounded by the upper plate 18, the frame 19, the voice coil bobbin 21 and the damper 22 of
the first speaker unit 14, and a center pole 15 and a lower plate 16 This is a second space part
surrounded by the magnet 17 and the upper plate 18.
[0011]
The operation of the speaker apparatus of this embodiment configured as described above will
be described below.
A first air passage is formed between the first space 32, the first air hole 28, the second space
33, the second air hole 29, and the first air tube 31; When the second speaker unit 30 oscillates
in the outward direction of the speaker box 27, air inside the speaker box 27 passes through the
damper 22 of the first speaker unit 14 and flows into the first air passage.
That is, the air flow having passed through the damper 22 flows into the first space portion 32,
passes through the first air vent 28, flows into the second space portion 33, and further passes
through the second air vent 29. Leading to the vent pipe 31 of the
[0012]
Conversely, when the second speaker unit 30 swings in the direction toward the inside of the
speaker box 27, the air in the first air passage passes the damper 22 and flows out to the internal
space of the speaker box 27.
That is, the air inside the first vent pipe 31 passes through the second vent hole 29 and flows
into the second space 33, and further passes through the first vent 28 and enters the first space
portion 32. It flows in, passes through the damper 22, and flows out to the internal space of the
speaker box 27.
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[0013]
Therefore, the air flow passing through the first vent 28 directly cools the voice coil 20 as the
heat source, and the air flow passing not only the first vent 28 but also the first space portion 32
is the voice coil As a result, the temperature rise of the voice coil 20 can be mitigated by cooling
the heat-transferable portion 20, that is, the top plate 18 adjacent to the voice coil 20 and the
center pole portion 15.
[0014]
The first speaker unit 14 and the second speaker unit 30 are driven in phase by the same signal
source, that is, the first speaker unit 14 and the second speaker unit 30 are simultaneously
driven outside the speaker box 27 or By amplifying in the internal direction, the total sound
pressure as the speaker device is the sum of the sound pressure of the first speaker unit 14 and
the sound pressure of the second speaker unit 30, thereby providing a speaker device with
higher output. Is possible.
[0015]
(Embodiment 2) The second embodiment of the present invention will be described below with
reference to the drawings.
[0016]
FIG. 3 is a cross-sectional view showing the structure of the speaker device according to the same
embodiment, and 34 in the drawing is a part of a portion between the magnetic circuit coupling
surface and the damper coupling surface of the frame 19 of the first speaker unit Is a third vent
provided in the second embodiment, 35 is a fourth vent provided in the speaker box 27, and 36
is a second vent pipe provided between the third vent 34 and the fourth vent 35. is there.
The other numbers given in the figure are exactly the same as in the first embodiment.
[0017]
Here, the major difference from the first embodiment is that the air tightness of the damper 22 is
enhanced, and the third vent 34, the fourth vent 35 and the second vent pipe 36 are newly
provided. The second air passage is formed between the space 32, the third air hole 34, the
second air tube 36, the fourth air hole 35, and the external space of the speaker box 27.
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[0018]
The operation of the speaker apparatus according to this embodiment configured as described
above will be described below.
[0019]
When the second speaker unit 30 vibrates in the outward direction of the speaker box 27 by
increasing the airtightness of the damper 22 and providing the second air passage, the air in the
space outside the speaker box 27 is second Flow into the first air passage from the second air
passage.
That is, the air in the external space of the speaker box 27 passes through the fourth vent 35, the
second vent pipe 36, and the third vent 34 and flows into the first space portion 32, and the first
vent 28 And flow into the second space 33 and further pass through the second vent hole 29 to
the first vent pipe 31.
[0020]
Conversely, when the second speaker unit 30 swings inward toward the inside of the speaker box
27, air in the first and second air passages is discharged to the external space of the speaker box
27.
That is, the air inside the first vent pipe 31 passes through the second vent hole 29 and flows
into the second space 33, and further passes through the first vent 28 and enters the first space
portion 32. It flows into the external space of the speaker box 27 through the third vent 34, the
second vent pipe 36 and the fourth vent 35.
[0021]
Therefore, since the air in the space outside the speaker box 27 and the air in the first air
passage always circulate as compared with the first embodiment, the cooling effect of the voice
coil 20, the upper plate 18, and the center pole portion 15 is increased. Thus, the temperature
rise of the voice coil 20 can be further reduced.
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[0022]
As in the first embodiment, by driving the first speaker unit 14 and the second speaker unit 30 in
phase with the same signal source, the total sound pressure as the speaker device is the first
speaker. Not only is the sum of the sound pressure of the unit 14 and the sound pressure of the
second speaker unit 30, but the damper 22 and the second speaker unit 30 with improved
airtightness have the same phase amplitude, so the external space of the speaker box 27 The
circulation of the air and the air in the first air passage is increased, and the cooling effect of the
voice coil 20 is also enhanced.
[0023]
(Third Embodiment) The third embodiment of the present invention will be described below with
reference to the drawings.
[0024]
FIG. 4 is a cross-sectional view showing the structure of the speaker device according to the
embodiment. In the figure, reference numeral 37 denotes a sound insulation wall provided in the
speaker box 27 to cover the second speaker unit 30. As shown in FIG.
The other numbers attached in the figure are exactly the same as the first embodiment.
[0025]
Here, what is largely different from the first embodiment is that the sound insulation wall 37 is
provided to shut off the ventilation between the front side of the second speaker unit 30 and the
external space of the speaker box 27.
[0026]
The operation of this embodiment configured in this way is completely the same as that of the
first embodiment, and the cooling effect of the voice coil 20 is the same. However, by providing
the sound insulation wall 37, the second speaker unit 30 is provided. The sound pressure
frequency characteristic as the speaker device is determined only by the first speaker unit 14
because the radiation sound from the front of the speaker is not transmitted to the external space
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of the speaker box 27.
That is, the sound pressure frequency characteristic as the speaker device caused by the mutual
interference of the radiation sound of the first speaker unit 14 and the radiation sound of the
second speaker unit 30 is not influenced by the peak, the dip or the like.
[0027]
In the present embodiment, the speaker device of the first embodiment is described as having the
sound insulation wall 37, but the present invention is not limited to this, and the speaker device
of the second embodiment is described. The same effect can be obtained by providing the abovementioned sound insulation wall 37, and when the sound insulation wall 37 is provided, the
opening of the second speaker unit 30 is directed toward the inside of the speaker box 27. The
same effect can be obtained.
[0028]
Fourth Embodiment The fourth embodiment of the present invention will be described below.
[0029]
Although the present embodiment is not shown, the major difference from the previous
embodiments is that the second speaker unit 30 is driven at a constant frequency separately
from the signal input to the first speaker unit 14. If the second speaker unit 30 is driven at a
constant frequency, a constant air flow is always generated in the first air passage regardless of
the signal input to the first speaker unit 14. .
Accordingly, since the air flow passing through the first air vents 28, that is, the outer peripheral
surface of the voice coil 20 is also constant, a stable cooling effect of the voice coil 20 can be
obtained.
[0030]
Further, if the second speaker unit 30 is driven at a low frequency, particularly at a frequency
outside the audible band of 20 Hz or less, a large air flow is generated in the first air passage,
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and the cooling effect of the voice coil 20 is increased.
Moreover, even when the radiation sound of the second speaker unit 30 is transmitted to the
external space of the speaker box 27 as in the first and second embodiments, the sound pressure
of the speaker device is the second speaker in the audible band. It is to be determined only by the
first speaker unit 14 without being influenced by the sound emitted from the unit 30.
[0031]
The concept of the invention so far is not limited to that illustrated in the above embodiments,
and for example, the shapes and the number of the first vent holes 28 and the second vent holes
29 are merely examples thereof. Also, the magnetic circuit of the first speaker unit 14 is
configured to use an external magnet type, but may be an internal magnet type, and the speaker
box 27 has been a closed type, but may be a phase inversion type. is there.
[0032]
As described above, in the speaker device according to the present invention, the air flow
generated with the vibration of the speaker unit for cooling directly cools the outer peripheral
surface of the voice coil of the speaker unit for sound source. The temperature rise of the coil can
be reduced, and the rise in resistance value due to the heat generation of the voice coil can be
reduced, and a speaker device with high input resistance and large output can be provided.
[0033]
Brief description of the drawings
[0034]
1 is a cross-sectional view showing the structure of the speaker device according to the first
embodiment of the present invention
[0035]
FIG. 2 (a) is a plan view showing details of the magnetic circuit unit of the embodiment.
[0036]
3 is a cross-sectional view showing the structure of the speaker apparatus according to the
second embodiment of the present invention
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[0037]
4 is a cross-sectional view showing the structure of a speaker apparatus according to a third
embodiment of the present invention
[0038]
5 is a cross-sectional view showing the structure of the conventional speaker device
[0039]
Explanation of sign
[0040]
14 first speaker unit 15 center pole portion 16 lower plate 17 magnet 18 upper plate 19 frame
20 voice coil 21 voice coil bobbin 22 damper 23 diaphragm 24 edge 25 gasket 26 dust cap 27
speaker box 28 first air hole 29 second Ventilation holes 30 second speaker unit 31 first
ventilation tube 32 first space portion 33 second space portion 34 third ventilation hole 35
fourth ventilation hole 36 second ventilation tube 37 sound insulation wall
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