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JP2008085727

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DESCRIPTION JP2008085727
The present invention relates to a speaker, and an object thereof is to prevent generation of
abnormal sound. In order to achieve this object, according to the present invention, heat
generated by a voice coil is efficiently released to the atmosphere in a speaker made of a resin
for reducing the weight of a frame 9 which is a component of the speaker. The heat dissipating
paint 19 was applied to the surface of the frame 9 and the surface of the yoke 13 in order to
diffuse the heat. Thereby, the deformation of the frame due to heat can be prevented, and as a
result, the generation of abnormal sound of the speaker can be suppressed. [Selected figure]
Figure 1
Speaker and car and audio system using the same
[0001]
The present invention relates to a speaker and a car and an audio system using the same.
[0002]
Hereinafter, a conventional speaker will be described with reference to FIG.
As shown in FIG. 5, the conventional speaker 1 has a dish-like frame 2, a diaphragm 3 attached
to the opening surface of the frame 2, and a voice coil 4 attached to the lower surface side of the
diaphragm 3. The magnetic circuit body 6 has the magnetic gap 5 into which the voice coil 4
enters and is supported by the frame 2. Further, the magnetic circuit body 6 is constituted by a
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metal yoke 7 supported by the frame 2 and a magnet 8 mounted on the yoke 7.
[0003]
The voice coil 4 is movably disposed in the magnetic gap 5 at a predetermined distance from the
yoke 7 and the magnet 8.
[0004]
Further, this conventional speaker 1 uses a thermoplastic synthetic resin for the frame 2 and is
configured to be lighter than when an iron plate or an aluminum die cast is used.
[0005]
As prior art document information related to the invention of this application, for example,
Patent Document 1 is known.
Japanese Patent Application Publication No. 06-315195
[0006]
The conventional speaker 1 causes the voice coil 4 to move by the action of the magnetic force of
the magnet 8 by causing an audio signal to flow through the voice coil 4 and vibrates the
diaphragm 3 to generate sound.
However, when an audio signal is supplied to the voice coil 4, module heat is generated in the
voice coil 4 together with the driving force, and the temperature of the yoke 7 disposed in the
vicinity of the voice coil 4 rises. It is transmitted. At this time, the frame 2 is intended to reduce
the weight, and a thermoplastic synthetic resin is used. Therefore, the frame 2 is easily deformed
by the influence of heat, and the magnet 8 connected to the deformed frame 2 touches the voice
coil 4. As a result, there is a problem that an abnormal sound is generated when the power is
turned on.
[0007]
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Therefore, an object of the present invention is to prevent the generation of abnormal sound of a
speaker.
[0008]
In order to achieve this object, in the present invention, the surface of the frame made of resin is
coated with a heat dissipating paint having a thermal conductivity higher than that of the frame.
[0009]
With the above configuration, the heat generated by the voice coil can be efficiently dissipated
through the heat dissipating paint.
Thereby, the deformation of the frame due to heat can be prevented, and as a result, the
generation of abnormal sound of the speaker can be suppressed.
[0010]
Hereinafter, one embodiment of the present invention will be described with reference to FIG.
FIG. 1 is a cross-sectional view showing a speaker of the present invention.
[0011]
The magnetic circuit body 10 disposed on the inner peripheral portion of the dish-like frame 9 is
composed of the magnet 11, the upper plate 12, and the metal yoke 13 connected to the bottom
of the frame 9. A cylindrical magnetic gap 14 is formed in the gap between the outer side
surfaces of the magnet 11.
[0012]
The frame 9 is mainly made of polypropylene resin or acrylic butadiene styrene resin as a main
material, in order to make the frame 9 lighter in weight and more flexible in shape than those
made of iron plate or aluminum die-cast, and reinforcement materials such as glass fibers Is
formed by injection molding of a resin material mixed with
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[0013]
A cylindrical voice coil 15 is disposed in the magnetic gap 14 with a gap from the magnet 11,
and the voice coil 15 is movable in the vertical direction by application of an audio signal.
The voice coil 15 has a structure in which the inner circumferential diameter is held constant by
winding the coil around a voice coil bobbin 15a, and the upper end portion is closed by a dust
cap 16 in order to prevent the entry of dust.
[0014]
The inner peripheral portion of the damper 17 is connected to the outer side surface of the voice
coil 15, and the outer peripheral portion is connected to the frame 9.
[0015]
The voice coil 15 is connected to the lower surface side of the inner peripheral portion of the
diaphragm 18, and vibrates due to the fluctuation of the voice coil 15 in the vertical direction.
Further, the outside of the outer peripheral portion of the diaphragm 18 is connected to the
outer peripheral portion 9 a of the frame 9 via the edge 18 a.
[0016]
On the surfaces of the frame 9 and the yoke 13, as shown in FIGS. 2 to 4, a heat dissipating paint
19 having a thermal conductivity higher than that of the frame 9 is continuously applied to the
frame 9 from the yoke 13 side.
The heat dissipating paint 19 is a paint containing a heat dissipating material, and generally
contains aluminum, an aluminum alloy, magnesium, and a magnesium alloy, which are good in
thermal conductivity, in an acrylic or vinyl based paint. It consists of Further, a part of the heat
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dissipating piece protrudes from the coating film surface of the heat dissipating paint 19, and a
coating film having a convex-concave shape is formed on the surfaces of the frame 9 and the
yoke 13.
[0017]
Next, the operation of the speaker in this embodiment will be described with reference to FIG.
[0018]
When a voice signal is applied to the voice coil 15, the voice coil 15 reacts with the magnetic
field generated by the magnet 11, and a driving force is generated in the voice coil 15.
The driving direction is in accordance with Fleming's left hand rule, and the voice coil 15
fluctuates up and down. Due to the fluctuation of the voice coil 15, the diaphragm 18 connected
to the voice coil body 15 vibrates to generate air by moving air.
[0019]
However, when an audio signal flows through the voice coil 15, Joule heat is generated along
with the driving force in the voice coil 15. This heat is transmitted to the yoke 13 disposed in the
vicinity of the voice coil 15 via air, and further The heat transmitted to the yoke 13 is transmitted
to the frame 9 connected to the yoke 13. At this time, since thermoplastic synthetic resin is used
for the frame 9, the frame 9 is deformed by the influence of heat, and the magnet 11 connected
to the deformed frame 9 contacts the voice coil 15 being driven. There was a risk of rubbing and
an abnormal sound being generated in the speaker.
[0020]
Therefore, in the present embodiment, the heat dissipating paint 19 having a thermal
conductivity higher than that of the frame 9 is applied to the surface of the frame 9 continuously
from the yoke 13, and the heat accumulated in the frame 9 is achieved by this. Is radiated to the
outside of the frame 9 through the heat dissipating paint 19 and from the parts of the frame 9 to
the air efficiently. For this reason, the heat transmitted from the voice coil 15 to the frame 9 is
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rapidly radiated into the air, and the frame 9 is not deformed by heat, and the generation of
abnormal sound of the speaker caused by the thermal deformation of the frame 9 is prevented.
be able to.
[0021]
In addition, as the surface area of the coating film is larger, more heat can be dissipated, so it is
desirable to make the heat dissipating piece included in the heat dissipating paint 19 protrude on
the surface of the coating film. That is, the surface area of the coating film becomes larger than
that of the coating film having no convex and concave shape by forming the coating film having a
convex and concave shape on the surface of the frame 9 by making the heat dissipation piece
project from the coated film surface, Are emitted into the atmosphere. In addition, by causing the
heat dissipating piece to protrude from the coating film surface, the heat dissipating piece having
high thermal conductivity directly touches the air, and more heat can be dissipated to the air
than when the heat dissipating piece is buried in the coating film.
[0022]
The heat radiation from the inner surface of the frame 9 is not efficient because the emitted heat
is also stored in the space between the frame 9 and the diaphragm 18. Therefore, the heat
dissipating paint 19 may be applied only to the outer surface of the frame 9.
[0023]
Further, the heat dissipating piece contained in the heat dissipating paint to be applied to the
surface of the frame 9 efficiently dissipates heat from the frame 9 and the yoke 13 to the
atmosphere by using a material having high thermal conductivity. Therefore, it is desirable that
metal powder be used for the heat dissipating piece contained in the heat dissipating paint 19.
Furthermore, aluminum, aluminum alloy, magnesium, and magnesium alloy have a low specific
gravity and excellent thermal conductivity, and by configuring the heat dissipating piece with
these, excellent heat dissipation from the heat dissipating paint 19 can be ensured.
[0024]
In addition to the application of the heat dissipating paint 19 as the present embodiment, the
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heat dissipating means may be added by providing the frame 9 with a large surface area such as
a heat dissipating fin.
[0025]
Moreover, although the speaker which has the magnetic circuit body 10 of an internal magnet
type was shown in this Embodiment, this invention is not limited to this, You may apply to the
speaker which has a magnetic circuit body of an external magnet type.
[0026]
In recent years, in-vehicle speakers are often exposed to high temperatures due to mounting on a
practical use door or mounting on a rear panel, and the demand for temperature resistance of the
speaker is increasing year by year.
At the same time, light weight and high input resistance are required as requirements for invehicle speakers, and it is effective to provide a speaker in a vehicle, for example, a door portion
according to the present invention, which is light in weight and excellent in heat dissipation.
[0027]
In addition, in the field of home audio systems, there is a tendency for smaller size, lighter weight
and larger input.
Originally, in the case of large input, it is necessary to make the voice coil diameter large in
proportion to that, but in actual situations it can not be larger than the issue of price. When a
large input is made to the speaker having such a configuration, the voice coil 15 generates Joule
heat in proportion to that and the heat is conducted to the frame 9 through the yoke 13 close to
the voice coil 15. The present invention is effective for dissipating this heat to the atmosphere
and preventing the generation of abnormal sound during the operation of the speaker.
[0028]
INDUSTRIAL APPLICABILITY The present invention can prevent generation of abnormal sound of
the speaker by enhancing the heat radiation effect in the speaker, and is particularly useful for a
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speaker that is required to be compact and have high input resistance for in-vehicle use and
home audio use.
[0029]
Cross-sectional view of a speaker according to an embodiment of the present invention Crosssectional partial enlarged view of a speaker according to an embodiment of the present invention
A plan view of a speaker according to an embodiment of the present invention An enlarged plan
view of a speaker according to an embodiment of the present invention Cross section of
Explanation of sign
[0030]
Reference Signs List 1 speaker 2 frame 3 diaphragm 4 voice coil 5 magnetic gap 6 magnetic
circuit body 7 yoke 8 magnet 9 frame 10 magnetic circuit body 11 magnet 12 upper plate 13
yoke 14 magnetic gap 15 voice coil 16 dust cap 17 damper 18 diaphragm 19 heat radiation Sex
paint
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