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JPH08140192

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DESCRIPTION JPH08140192
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker used in various audio equipment.
[0002]
2. Description of the Related Art In recent years, with the increase in output of audio amplifiers, it
has been required that speakers used particularly for business use have high resistance to input
and low distortion.
[0003]
A conventional loudspeaker will be described below with reference to the drawings.
FIG. 5 is a cross-sectional view showing the structure of a conventional speaker of this type, in
which 1 is a center pole, 2 is a lower plate integrated with the center pole 1 at the center, 3 is the
lower plate 2 A ring-shaped magnet 4 coupled to the upper surface of the magnet 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 1 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 in response to electrical signals, 7 is a driving force
generated in the voice coil 6 A voice coil bobbin for transmitting the vibration system, a cone-
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shaped diaphragm 8 whose central portion is coupled to the tip of the voice coil bobbin 7, a dust
cap 9 coupled to the upper surface of the central portion of the diaphragm 8; An air-permeable
damper 0 has an inner periphery coupled to an intermediate portion of the voice coil bobbin 7
and an outer periphery coupled to the frame 5, and an inner periphery 11 coupled to the outer
periphery of the diaphragm 8. A roll-like edge whose outer peripheral portion is connected to the
periphery of the frame 5, a gasket 12 which is connected to the upper surface of the outer
peripheral portion of the edge, 13 is a terminal which is connected to the frame 5, and 14 is a
voice coil bobbin 7 It is a gold thread wire connected to the middle part and the terminal 13 and
electrically relaying the voice coil 6 and the terminal 13.
[0004]
In such a conventional speaker, a first space formed by the lower surface of the dust cap 9, the
inner peripheral surface of the voice coil bobbin 7 and the upper surface of the center pole 1
corresponds to the outer peripheral surface of the center pole 1 and the inside of the voice coil
bobbin 7. A narrow annular gap formed by the circumferential surface, a space formed by the
outer peripheral surface of the center pole 1, the upper surface of the lower plate 2, the inner
peripheral surface of the magnet 3 and the lower surface of the upper plate 4, and the outer
periphery of the voice coil 6 Formed by the outer peripheral surface of the voice coil bobbin 7,
the lower surface of the damper 10, the inner peripheral surface of the frame 5 and the upper
surface of the upper plate 4 via a thin annular gap formed by the surface and the inner
peripheral surface of the upper plate 4 Ventilation is performed between the second space and
the outside space of the frame 5, that is, the space outside the speaker 5 through the airpermeable damper 10.
[0005]
However, when a large input is applied to the speaker having such a configuration, a large
current flows in the voice coil 6 to generate heat, and the heat generated in the voice coil 6 is the
outer peripheral surface of the center pole 1 The air is transmitted to the center pole 1 through
the air in the space sandwiched by the inner peripheral surface of the voice coil bobbin 7 and the
upper portion through the air in the space sandwiched by the inner peripheral surface of the
upper plate 4 and the outer peripheral surface A thin annular space formed by the outer
peripheral surface of the center pole 1 and the inner peripheral surface of the voice coil bobbin 7
is cooled by transmitting to the plate 4 and the inner peripheral surface of the upper plate 4 and
the outer periphery of the voice coil 6 It is also cooled by air movement in the narrow toroidal
gap formed by the surface.
[0006]
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However, air has a low thermal conductivity, and ventilation between the first space and the
speaker external space is achieved by the thin annular gap between the outer peripheral surface
of the center pole 1 and the inner peripheral surface of the voice coil bobbin 7 and the upper
plate 4. The air flow was insufficient because the air was made through the narrow annular gap
between the inner peripheral surface of the voice coil 6 and the outer peripheral surface of the
voice coil 6, and the heat of the voice coil 6 was not sufficiently cooled.
As a result, the resistance value of the voice coil 6 is increased due to heat generation, the
current is decreased, and the output sound pressure corresponding to the electrical input can not
be obtained.
[0007]
In addition, during the operation of the speaker, expansion and compression of air in the first
space is repeated, and particularly when the low frequency region has a large amplitude, the
expansion and compression ratio of air is large because the ventilation is not sufficient, and the
amplitude is suppressed and the reproduced sound is reproduced. Not only does it cause a drop
in pressure level, it also has the problem that distortion due to non-linearity of air compliance
occurs.
[0008]
It is an object of the present invention to solve such conventional problems and to provide a
speaker with high input resistance and low distortion in which the temperature rise of the voice
coil is reduced.
[0009]
[Means for Solving the Problems] In order to solve this problem, the loudspeaker according to
the present invention is provided with vents by partially enlarging the magnetic gap by notching
the inner and outer peripheral surfaces of the magnetic gap, respectively. Between the space
enclosed by the lower surface of the voice coil bobbin and the upper surface of the magnetic
circuit, the space enclosed by the lower surface of the damper, the outer peripheral surface of the
voice coil bobbin and the inner circumferential surface of the frame and the upper surface of the
magnetic circuit An air passage is formed.
[0010]
With this configuration, the air flow generated with the movement of the dust cap or the damper
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cools the voice coil when passing through the air vent provided in the magnetic gap, and the air
vent provided in the magnetic gap further reduces the internal space of the speaker. Nonlinearity of air compliance in the
[0011]
Embodiment 1 Hereinafter, a first embodiment of the present invention will be described with
reference to the drawings.
[0012]
FIG. 1 is a front sectional view showing the configuration of the loudspeaker according to the
embodiment, and FIGS. 2 (a) and 2 (b) are a plan view and a front sectional view of the magnetic
circuit of the loudspeaker. Is a lower plate, 17 is a ring magnet magnetized in a thickness
direction, 18 is a ring upper plate, 19 is a frame, 20 is a voice coil, 21 is a voice coil bobbin, 22 is
a cone-shaped diaphragm, 23 is A dust cap, 24 is a damper, 25 is an edge, 26 is a gasket, 27 is a
terminal, 28 is a gold wire, and 29 is a portion of the outer peripheral surface of the center pole
15 cut away to the inner peripheral surface of the voice coil bobbin 21 The first vent 30 formed
is a second vent formed between the outer peripheral surface of the voice coil bobbin 21 and a
portion of the inner peripheral surface of the upper plate 18 cut away.
[0013]
In the speaker of this embodiment configured as described above, a first space formed by the
inner peripheral surface of the voice coil bobbin 21, the lower surface of the dust cap 23, and the
upper surface of the center pole 15, and the first vent hole 29 A magnetic circuit internal space
formed by the outer peripheral surface of the center pole 15, the upper surface of the lower plate
16, the inner peripheral surface of the magnet 17, and the lower surface of the upper plate 18,
the second air hole 30, and the outer periphery of the voice coil bobbin 21 An air passage is
formed between the second space formed by the surface, the lower surface of the damper 24, the
inner peripheral surface of the frame 19, and the upper surface of the upper plate 18, the airpermeable damper 24 and the speaker external space. Ru.
[0014]
When the vibration system moves downward during operation of the speaker, the air in the first
space moves to the internal space of the magnetic circuit through the first air hole 29 and the
second air hole 30 is further moved. After being moved to the second space via the through hole,
it passes through the damper 24 and is discharged to the outside space of the speaker.
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Conversely, when the vibration system moves upward, air in the external space of the speaker
passes through the damper 24 and moves to the second space, and then moves to the internal
space of the magnetic circuit through the second vent hole 30. Furthermore, it flows into the first
space via the first vent 29.
Therefore, the air flow passing through the first air hole 29 cools the inner peripheral surface of
the voice coil bobbin 21 wound with the voice coil 20 and the center pole 15 adjacent to the
voice coil bobbin 21, and further the second air hole 30 The passing air flow directly cools the
outer peripheral surface of the voice coil 20 which is a heat source, and the temperature rise of
the voice coil 20 is reduced because the upper plate 18 adjacent to the voice coil 20 is cooled.
In addition, the air in the first space can be easily ventilated during vibration, and the decrease in
compliance and non-linearity caused by the expansion and compression of the air in the first
space can be improved. Can be reduced.
[0015]
Further, if the shapes of the first vent hole 29 and the second vent hole 30 are equalized and
arranged at equal intervals on the center pole 15 and the upper plate 18, the voice coil 20, the
voice coil bobbin 21 and the damper 24 can be ventilated. Since the radial pressure applied from
the air moving on the path is offset each other, it is possible to prevent the occurrence of rolling
due to the imbalance of the wind pressure from the air path, and the driving force unbalance due
to the deviation of the magnetic flux density distribution of the magnetic gap. It is also possible
to prevent the occurrence of rolling due to balance.
[0016]
Note that, as shown in FIG. 2, if the first air holes 29 and the second air holes 30 are opposed to
each other, the outer peripheral surface of the center pole 15 excluding the first air holes 29 and
the second air holes 30. Since the opposing area of the inner peripheral surface of the upper
plate 18 is maximized, the reluctance is minimized, and the narrow annular gap of the magnetic
gap maximizes the efficiency of the speaker.
[0017]
(Embodiment 2) The second embodiment of the present invention will be described below with
reference to the drawings.
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[0018]
FIG. 3 is a front sectional view showing the structure of the loudspeaker according to the
embodiment, and 31 in the same figure is a third vent.
The same reference numerals as in the first embodiment denote the same parts as in the first
embodiment, and the second embodiment is largely different from the first embodiment in the
airtightness of the damper 24. The third air hole 31 is formed between the joint of the voice coil
bobbin 21 and the joint of the damper 24 and the joint of the diaphragm 22.
[0019]
The speaker of this embodiment configured in this way has a second space, a second vent 30, a
magnetic circuit internal space, a first vent 29, a first space, and a third. An air passage is formed
between the air vent 31 and the external space of the speaker.
When the vibration system moves downward during the operation of the speaker, the air in the
second space moves to the internal space of the magnetic circuit through the second air vent 30
and the first air vent 29 It moves to the first space through the third vent hole 31 and is
discharged to the external space of the speaker.
Conversely, when the vibration system moves upward, the air in the external space of the
speaker passes through the third vent 31 and moves to the first space, and the inside of the
magnetic circuit via the first vent 29 It moves into space and further flows into the second space
through the second vent 30.
[0020]
Generally, since the area of the damper 24 is considerably larger than the area of the dust cap
23, the amount of movement of air generated by the movement of the damper 24 is larger than
the amount of movement of air generated by the movement of the dust cap 23.
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Therefore, if compared with the first embodiment at the same amplitude, the amount of air
passing through the first vent hole 29 and the second vent hole 30 is large, and the effect of
reducing the temperature rise of the voice coil 20 is large. .
In addition, since the air of the first and second spaces is ventilated by the first air hole 29, the
second air hole 30, and the third air hole 31 when vibrating, It is possible to reduce the reduction
in air compliance, the reduction in output sound pressure level due to non-linearity, and the
distortion in reproduced sound.
[0021]
By making all the shapes of the third vent holes equal, and arranging them at equal intervals and
at the same height on the voice coil bobbin 21, the wind pressure from the air passage is
unbalanced as in the first embodiment. It is possible to prevent the occurrence of rolling.
[0022]
(Third Embodiment) The third embodiment of the present invention will be described below with
reference to the drawings.
[0023]
FIG. 4 is a front sectional view showing the structure of the speaker according to the
embodiment, and 32 in the same figure is a fourth vent.
The same reference numerals as in the first and second embodiments denote the same reference
numerals as those in the first and second embodiments, and the third embodiment differs from
the second embodiment in that the third embodiment is provided on the voice coil bobbin 21.
Instead of the air holes 31, the fourth vent hole 32 is provided between the joint portion of the
diaphragm 22 with the voice coil bobbin 21 and the joint portion of the dust cap 23.
[0024]
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The operation of this embodiment is the same as that of the second embodiment, except that the
fourth air hole 32 is provided instead of the third air hole 31 so that the air passage has a second
space and a second space. , The magnetic circuit internal space, the first air hole 29, the first
space, the fourth air hole 32, and the external space of the speaker.
When the vibration system moves downward during the operation of the speaker, the air in the
second space moves to the internal space of the magnetic circuit through the second air vent 30
and the first air vent 29 It moves to the first space through the fourth vent hole 32 and is
discharged to the external space of the speaker.
Conversely, when the vibration system moves upward, the air in the space outside the speaker
passes through the fourth vent 32 and moves to the first space, and the inside of the magnetic
circuit via the first vent 29 It moves into space and further flows into the second space through
the second vent 30.
[0025]
Therefore, as in the second embodiment, the temperature rise of the voice coil 20 because there
is a large amount of air passing through the first vent hole 29 and the second vent hole 30 as
compared to the first embodiment. The first and second air holes are ventilated by the first and
second air holes 29, 30 and the fourth air hole 32 during vibration. The air compliance in the
space can be reduced, the output sound pressure level can be reduced due to non-linearity, and
distortion in the reproduced sound can be reduced.
[0026]
By making all the shapes of the fourth vent holes 32 equal and arranging the same in the
diaphragm 22 at equal intervals and at the same height, the unbalance of the wind pressure from
the vent passage as in the previous embodiments. It is possible to prevent the occurrence of
rolling due to
[0027]
In addition, if the third air holes 31 and the fourth air holes 32 are used in combination, the air
flow between the first space and the second space and the space outside the speaker becomes
even easier, so the temperature rise of the voice coil 20 Of the air of the first and second spaces,
the decrease of the output sound pressure level due to the non-linearity, and the distortion in the
reproduced sound can be further reduced.
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[0028]
Although all of the first to third embodiments are described as using the external magnetic type
magnetic circuit, the magnetic circuit is not limited to the external magnetic type, for example,
the internal magnetic type. It is needless to say that the same effect can be obtained even if it is
used.
[0029]
As described above, the present invention provides a speaker with high input resistance and low
distortion, and the air flow generated with the movement of the dust cap or the damper with
improved airtightness is the inner and outer periphery of the magnetic gap. Since the voice coil is
air cooled by passing through the vent holes provided by cutting the surface, it is possible to
reduce the temperature rise of the voice coil at the time of large input, and further to the vent
holes or voice coil bobbin provided in the magnetic gap The vents provided can also improve the
compliance non-linearity of the air inside the speaker.
[0030]
Brief description of the drawings
[0031]
1 is a front sectional view showing the structure of a speaker according to a first embodiment of
the present invention
[0032]
FIG. 2 (a) is a plan view showing the configuration of the magnetic circuit of the embodiment.
[0033]
3 is a front sectional view showing the structure of a speaker according to a second embodiment
of the present invention
[0034]
4 is a front sectional view showing the structure of the speaker according to the third
embodiment of the present invention
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[0035]
5 is a front sectional view showing the configuration of the conventional speaker
[0036]
Explanation of sign
[0037]
Reference Signs List 15 center pole 16 lower plate 17 magnet 18 upper plate 19 frame 20 voice
coil 21 voice coil bobbin 22 diaphragm 23 dust cap 24 damper 25 edge 26 gasket 27 terminal
28 gold wire 29 first air hole 30 second air hole 31 second 3 vents 32 4th vents
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