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JP2009124200

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DESCRIPTION JP2009124200
A speaker device capable of effectively radiating heat of a magnetic circuit by bringing an air
flow into contact with the entire magnetic circuit at a high flow velocity by utilizing an air flow
generated on the back side of a diaphragm during speaker operation. provide. A speaker device
includes a magnetic circuit and a diaphragm that vibrates by the magnetic circuit, the speaker
includes a cover that covers the magnetic circuit, and the cover is provided on the back side of
the diaphragm by the vibration of the diaphragm. The generated air flow is guided to the bottom
side via the outer periphery of the magnetic circuit, and a plurality of elongated groove-like ducts
are disposed to be discharged from the bottom side central portion. [Selected figure] Figure 5
Speaker device
[0001]
TECHNICAL FIELD The present invention relates to a speaker device, particularly to a speaker
device having a high temperature temperature suppression effect of a magnetic circuit.
[0002]
As is well known, a speaker device represented by a dynamic speaker has a magnetic circuit
including a magnet and a voice coil as a drive unit, and vibrates a diaphragm connected to the
voice coil back and forth by an electric signal to produce sound. The magnetic circuit heats up
and becomes hot with continued operation.
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1
Although raising the temperature of the magnetic circuit is not preferable, in the conventional
speaker apparatus of this type, only the outer peripheral surface of the magnet and the bottom
and peripheral side surfaces of the yoke for fixing the magnet are exposed to the atmosphere.
This relies on natural heat radiation, and since there is no air flow, effective heat radiation can
not be performed, and it has been difficult to cope with high power.
[0003]
In JP-A-9-55996, in a repulsive magnetic circuit type speaker, a radiation fin is provided on the
outer periphery of a box-like holder for fixing a magnetic circuit portion, and an opening facing
the radiation fin is provided in a speaker frame surrounding a diaphragm. It is disclosed that the
heat of the magnetic circuit is dissipated using the flow of air generated by the vibration of the
diaphragm. However, also in this prior art, it is difficult to effectively cool the heat of the
magnetic circuit because the heat generated by the magnetic circuit is only indirectly dissipated.
JP-A-9-55996
[0004]
The present invention has been made to solve the problems as described above, and the purpose
of the present invention is to utilize the air flow generated on the back surface side of the
diaphragm during the operation of the speaker and to use the air flow for the entire magnetic
circuit. An object of the present invention is to provide a speaker device capable of causing a flow
velocity to contact at an increased speed and effectively dissipating heat of a magnetic circuit. In
the present invention, the "diaphragm" is a concept including the diaphragm itself and the
vibration parts behind it in connection with the diaphragm itself. Therefore, "the back side of the
diaphragm" is the back side of the diaphragm itself As well as the side, in the case of having a
damper as a vibrating part, it includes the back side of this.
[0005]
In order to achieve the above object, the speaker device of the present invention is a speaker
device provided with a magnetic circuit and a diaphragm that is vibrated by the magnetic circuit,
and the cover device is provided with a cover for covering the magnetic circuit. The air flow
generated on the back side of the diaphragm when the plate vibrates is guided to the bottom side
via the outer circumference of the magnetic circuit, and a plurality of elongated groove-shaped
ducts discharged from the center on the bottom side are arranged. It is characterized.
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[0006]
According to the present invention, a plurality of ducts in the form of elongated grooves provided
in the cover body, the cover body being disposed to cover the magnetic circuit, generate an air
flow generated on the back side of the diaphragm when the diaphragm vibrates. Since it is led to
the bottom side vertically through the outer circumference of the disc and emitted from this
bottom side central part, the air flow generated on the back side of the diaphragm is skillfully
utilized to evenly contact the entire magnetic circuit to effectively cool it. It becomes possible.
[0007]
In addition, although it is necessary to have a relatively high air flow velocity to cool the
magnetic circuit, since the duct is formed in the shape of a narrow slot (slit), the flow velocity of
the air generated on the back side of the diaphragm accelerates. Higher heat dissipation effect
can be obtained.
In addition, since the air flow is exhausted from the center on the bottom side of the magnetic
circuit, the vibration wave (air flow) passing through the duct wraps around on the radiation
surface (front surface) side of the diaphragm and affects the radiation sound in the front
direction. Giving is prevented.
[0008]
Preferably, the cover body including the duct is formed of a member having high thermal
conductivity.
According to this, the heat of the magnetic circuit can be efficiently removed and dissipated.
[0009]
The cover body has a cup shape with a peripheral wall facing the outer periphery of the magnet
of the magnetic circuit and the bottom yoke, and a bottom wall bent from the tip of the
peripheral wall and facing the bottom surface of the bottom yoke, and each duct has the cover
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3
portion One end is open at the beginning of the peripheral wall of the body, the middle runs
centripetally along the bottom wall, and the other end protrudes in the wall thickness direction
so as to open in the hole of the bottom wall located at the bottom center of the bottom yoke It is
configured as a recessed rib. According to this, it is possible to form an accurate passage for
effectively drawing the air flow to the bottom side through the outer periphery of the magnetic
circuit, and since the duct has a rib shape, the surface area is increased and the heat taken from
the magnetic circuit is effective. Can be dissipated.
[0010]
The cover body is connected to the rear end side of the speaker frame supporting the diaphragm,
and the rear end surface portion of the speaker frame has a passage for communicating the back
side space of the diaphragm to the duct of the cover body ing. According to this, when the
diaphragm vibrates, the air on the back surface side of the diaphragm can be effectively supplied
to the duct and used for heat dissipation of the magnetic circuit.
[0011]
Hereinafter, embodiments of the present invention will be described with reference to the
attached drawings. FIGS. 1 to 7 show a first embodiment of the speaker device according to the
present invention, in which 1 is a speaker body, 2 is a speaker frame made of synthetic resin, and
3 is a cover. The speaker main body 1 has a magnetic circuit portion 4, and the magnetic circuit
portion 4 has a ring-shaped top plate 5 and a plate portion having a large diameter as shown in
FIG. It has a bottom yoke 6 in which a column extends in the hole 5, a ring-shaped magnet 7 held
between the top plate 5 and the bottom yoke 6, and a voice coil 8 fitted in the column of the
bottom yoke 6. The top plate 5 is screwed to the bottom wall 20 of the speaker frame 2.
[0012]
In the speaker frame 2, in this embodiment, as a vibration system, a diaphragm 9 made of a cone
paper and a damper 10 are disposed, and a bobbin of the voice coil 8 extends in the central
opening of the diaphragm 9. The damper 10 supporting the diaphragm 9 faces the front side of
the bottom wall of the speaker frame 2, and the outer diameter edge is connected to the rear end
side wall 21 of the speaker frame 2. An equalizer 11 is screwed and fixed to a female screw at
the center of the column of the bottom yoke 6.
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4
[0013]
The above configuration is the same as that of the conventional speaker device, but the present
invention is characterized in that the air flow generated on the back side of the vibrating plate 9
(on the back side of the damper 10 in this embodiment) is generated. In order to use the heat
dissipation of the magnetic circuit portion 4 by utilizing the cover portion body 3 having a
special air flow induction path structure, the speaker is provided so as to cover the bottom yoke
6 from the main portion of the magnetic circuit portion 4. It is assembled behind frame 2.
[0014]
The entire cover 3 is formed by pressing or casting a metal such as aluminum having a high
thermal conductivity.
As shown in FIG. 5, the cover 3 has an inner diameter approaching the outer peripheral surface
of the magnet 7 of the magnetic circuit portion 4 and a peripheral wall 30 whose rear end
surface abuts the side wall of the speaker frame 2; Is formed in a cup shape with a bottom wall
portion 31 bent horizontally from the end of the portion and in contact with the bottom plate
portion 60 of the bottom yoke 6, and the bottom wall portion 31 is formed in the center portion
of the bottom plate portion of the bottom yoke 6. A hole 310 is formed to be loosely fitted in the
raised projection 600.
[0015]
In the cover body 3, an air flow generated on the back surface side of the damper 10 by the
vibration of the damper 10 disposed on the back surface side of the diaphragm 9 passes
longitudinally through the outer periphery of the magnetic circuit portion 4 on the bottom
surface side of the bottom yoke 6. A plurality of elongated groove-like ducts 32 are introduced at
predetermined intervals in the circumferential direction, which are introduced and finally
released from the hole 310 in the bottom central portion. Although eight in this embodiment, it
may be more or less than this. Each duct 32 is in the form of a rib which protrudes to the wall
thickness direction, particularly the outer surface side, of the peripheral wall portion 30 and the
bottom wall portion 31, and the inside is recessed at a predetermined depth as shown in FIGS.
The ducts 32 open in the axial direction at the base end of the cover body 3 in the axial direction,
extend in the height direction of the peripheral wall 30 and then bend and run centripetally
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5
along the bottom wall 31 The tip is opened in a hole 310 in the bottom wall corresponding to the
bottom central area of the bottom yoke 6.
[0016]
As shown in FIG. 3 and FIG. 6, a plurality of solid ribs 33 having the same shape as the duct 32
are arranged at intervals in the cover body 3, and the solid ribs 33 are arranged. A through hole
330 for inserting a screw, which extends toward the rear end side wall 21 of the speaker frame 2
as shown in FIG. 4, is bored in the rear end side wall 21 as shown in FIG. A hole 210 is provided,
and the cover body 3 is assembled integrally with the speaker frame 2 by screwing the fixing
screw 12 inserted into the seat through hole 330 into the female screw hole 210.
[0017]
In the speaker frame 2, ribs 23 are disposed on the outer diameter side of the rear end side wall
portion 21 at intervals corresponding to the ducts 32 and the solid ribs 33 of the cover body 3,
and these ribs 23 extend forward The edge 90 of the diaphragm 9 is connected to the inner
diameter portion of the flange for mounting and fixing, and the end face of the rib 23 is in
contact with the base end of the duct 32 and the solid rib 33.
Then, as shown in FIGS. 4 and 5, the bottom wall 20 of the speaker frame on the inner diameter
side of the rib 23 covers the rear space of the damper 10 in the peripheral area such as the
vicinity of the rear end side wall. A plurality of holes 24 are opened as passages for
communicating into the body 3.
[0018]
The magnetic circuit unit 4 is operated by the electric signal, and the diaphragm 9 and the
damper 10 are vibrated by the driving of the voice coil 8. Although it is known that the air on the
back side of the damper is drawn out of the speaker frame in order to improve the movement of
the damper 10 during operation of the speaker and to prevent the air layer from resisting the
movement of the damper 10. According to the invention, the air layer on the back side of the
damper 10 is not removed to the outside of the speaker and released into the cover 3 through
the plurality of holes 24 formed in the peripheral portion of the bottom wall of the speaker frame
2 Active air cooling of the part 4 is performed.
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[0019]
FIG. 7 shows the flow of the air flow behind the damper, and the peripheral wall 30 of the cover
body 3 has a plurality of grooved ducts 32 spaced in the circumferential direction, and is open in
the cover body. Therefore, the air discharged from the hole 24 as described above is in contact
with the outer periphery of the magnetic circuit portion 4, that is, the outer periphery of the top
plate 5, the outer surface of the magnet 7, and the outer periphery of the bottom yoke 6 by the
duct 32. It flows in the axial direction and then bends to flow concentrically along the space
between the bottom wall 31 and the bottom plate outer surface of the bottom yoke 6 and
discharges from the hole 310 surrounding the protrusion 600 at the center of the bottom yoke
bottom plate. Be done. Then, on the return side of the vibration amplitude, the outside air is
sucked through the hole 310, sent through the outer periphery of the magnetic circuit to the
back side of the damper, and the breathing action is performed.
[0020]
As described above, since the space behind the damper is circulated through the outer periphery
of the magnetic circuit portion 4, it is possible to cool the entire magnetic circuit all the more,
and a path for guiding such an air flow is a narrow groove shape of the duct 32 ( Since it is a slit,
the flow velocity of air can be increased, and the heat radiation effect can be further improved.
As the movement of the diaphragm 9 increases, the amount of heat released from the magnetic
circuit unit 4 also increases, but the amount of air flow from the back of the damper also
increases, so as to pass the outer periphery of the magnetic circuit unit 4 at a high flow velocity
as described above. The heat dissipation effect is also improved.
[0021]
In addition, the cover portion 3 is made of a material having high thermal conductivity such as
aluminum, and the duct 32 is formed into a three-dimensional shape as a rib, whereby the
surface area is increased and the duct 32 is not configured. Since the portions 30, 31 are in
contact with or close to the outer peripheral surface and the bottom surface of the bottom yoke
6, the heat radiation effect from this can be expected, and the entire magnetic circuit can be
uniformly cooled.
[0022]
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7
FIG. 8 shows a second embodiment of the present invention.
This embodiment is, for example, a speaker without a damper such as a tweeter, and instead of
the damper 10 in the first embodiment, the lower surface inner diameter portion of the top plate
5, the outer peripheral surface of the pillar portion of the bottom yoke 6 and the inner diameter
of the magnet A magnetic fluid 13 is filled in the annular space surrounded by the plane and the
space formed between the voice coil 8 and the equalizer 11.
[0023]
The present invention is also applied to such a damperless speaker, and the back side space of
the diaphragm 9 is communicated directly into the cover body 3 in the peripheral area such as
the vicinity of the rear end side wall in the bottom wall 20 of the speaker frame 2 A plurality of
holes 24 are opened as passages for air flow, and an air flow generated on the back surface side
of the cover 9 due to the vibration of the diaphragm 9 is vertically passed through the outer
periphery of the magnetic circuit 4 in the cover body 3. A plurality of elongated groove-shaped
ducts 32 which are guided to the bottom side and finally released from the hole 310 of the
bottom center portion are arranged at predetermined intervals in the circumferential direction.
The other configuration is the same as that of the first embodiment, and therefore the description
will be incorporated, and the same parts will be denoted by the same reference numerals.
[0024]
The operation of the second embodiment is the same as that of the first embodiment, and the
space behind the diaphragm 9 is made to flow through the outer periphery of the magnetic
circuit portion 4, so that the entire magnetic circuit can be cooled uniformly. Moreover, since the
path for guiding the air flow is a thin groove shape (slit) such as the duct 32, the flow velocity of
the air can be increased, and the heat dissipation effect can be further improved.
[0025]
It is the perspective view which looked at 1st Example of the speaker apparatus concerning this
invention from the front side.
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It is the perspective view which looked at 1st Example of the speaker apparatus concerning this
invention from the back side. It is a perspective view which shows the disassembled state of 1st
Example from the front side. It is a perspective view which shows the decomposition |
disassembly state of 1st Example from the back side. It is sectional drawing in alignment with the
XX line of FIG. It is sectional drawing in alignment with the YY line of FIG. (A) is sectional
drawing which shows the thermal radiation path | route in 1st Example, (b) is a partially cutaway
perspective view which shows a thermal radiation path | route. It is sectional drawing which
shows 2nd Example of this invention.
Explanation of sign
[0026]
DESCRIPTION OF SYMBOLS 2 Speaker frame 3 cover part 4 magnetic circuit part 5 top plate 6
bottom yoke 7 magnet 9 diaphragm 10 damper 24 hole 30 side wall part 31 bottom wall part
310 hole
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