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JP2004056544

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complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JP2004056544
A speaker device capable of efficiently radiating heat generated in a voice coil is provided.
SOLUTION: A cylindrical bobbin 13 is inserted in an annular magnetic gap portion formed inside
a holder 12 fixed to a frame 1, and an upper portion of the bobbin 13 is an inner side of a
damper 5 and a diaphragm. The voice coil 14 is fixed to the inner side of 9 and the voice coil 14
is wound around the middle part, and four extension parts 13a are provided at the lower part in
the circumferential direction. The bottom of the holder 12 is provided with a vent 12c which is
drilled so that each of the four extension parts 13a can penetrate and which communicates with
the magnetic gap part. When the voice coil 12 generates heat, the heat is transmitted to the
peripheral surface of the member such as the magnet 3 plate 4 via air and is also cooled by being
transmitted to the bobbin 13 having a large surface area, and at the same time, it is magnetically
Since the vent 12c communicating with the gap is in contact with the outside air, it is efficiently
cooled. [Selected figure] Figure 1
Speaker device
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker device having a function of radiating heat generated in a voice coil. [0002] A
conventional speaker apparatus, for example, a speaker apparatus having a repulsion type
magnetic circuit, is generally shown in FIG. 6, is shown as a holder in FIG. 7, and is shown as a
bobbin in FIG. That is, the holder 2 is fixed to the central portion of the frame 1 having a funnellike appearance, and a magnetic gap portion is formed therein. The holder 2 has a tubular
appearance with one end closed and has a flange portion 2a at the periphery of the open portion
and a center portion 2b protruding from the inner bottom portion, and the upper surface of the
center portion 2b The magnet 3, the plate 4 and the magnet 3 are formed in a laminated state to
form a magnetic forming portion, and a ring 7 is disposed on the outer peripheral surface of the
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plate 4 so as to be opposite to each other with a predetermined interval. A voice coil 8 is wound
around a lower portion of a cylindrical bobbin 6 supported by a damper 5 so as to be able to
move forward and backward with respect to a magnetic gap portion formed mainly on the outer
peripheral portion of the plate 4 It is fixed by 5 and fixed to the inner periphery of the funnelshaped diaphragm 9. The outer peripheral portion of the diaphragm 9 is supported and fixed to
the frame 1 via the edge portion 9a. Reference numeral 10 is a dust cap, and reference numeral
11 is a terminal plate to which each of the start and end of the wire forming the voice coil 8 is
connected via a lead wire (not shown) such as a tinsel wire. . Accordingly, when an audio signal is
supplied to the voice coil 8 through the terminal plate 11, the bobbin 6 is driven in the vertical
direction in the magnetic gap portion in the holder 2, and the diaphragm 9 is vibrated
accordingly. A predetermined sound emission will be made. SUMMARY OF THE INVENTION In
the conventional speaker device, heat is generated when an audio signal having a large level is
supplied to the voice coil 8, and the heat forms the magnetic gap portion, such as the magnet 3
plate 4 and the like. As well as being transmitted via air to the circumferential surface of the
member, it is cooled by being transmitted also to the bobbin 6. However, due to the space
forming the magnetic gap portion being an extremely thin gap and the sealed space formed by
the holder 2, the air flow becomes insufficient, and the heat of the voice coil 8 is sufficiently
There is a problem that it is not cooled. Therefore, the resistance value of the voice coil 8 is
increased by heat generation and the current is decreased, and the output sound pressure
corresponding to the electrical input can not be obtained, and if the voice coil 8 becomes high
temperature, the voice coil 8 Carbonization of the insulating coating causes electrical shorting,
and the voice coil 8 peels between the wires and the bobbin 6 and collides with the outer
peripheral surface of the plate 4 or the inner peripheral surface of the ring 7 to generate
abnormal noise and disconnection. Or, there is a problem that the voice coil 8 itself may be burnt
down to lead to disconnection.
Therefore, an object of the present invention is to provide a speaker device capable of efficiently
dissipating heat generated in a voice coil. SUMMARY OF THE INVENTION In order to solve the
above-mentioned problems, the speaker device according to the present invention adopts a
characteristic configuration as described below. (1) An annular magnetic gap portion formed
inside a holder fixed to a speaker frame, and a voice coil wound around a cylindrical bobbin
supported so as to be able to advance and retract with respect to the magnetic gap portion And
the holder is provided with an air vent communicating with the magnetic gap portion, and the
bobbin is extended in the axial direction of the cylinder and formed so as to enter the air vent.
Speaker device provided with (2) The speaker according to the above (1), wherein the air vent is
formed by a plurality of openings divided in a circumferential direction, and the extension part is
formed to be able to penetrate each of the openings. apparatus. (3) The holder is provided with a
first vent communicating with the magnetic gap portion, and the bobbin extends in the axial
direction of the cylinder and is formed so as to enter the first vent. The speaker device according
to the above (1) or (2), further comprising: an extending portion, and an additional second vent
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communicating with the magnetic gap portion. (4) The speaker apparatus according to (3),
wherein the first vent and the second vent communicate with each other in a wall surface of the
holder. (5) The speaker device according to any one of the above (1) to (4), wherein at least one
of the vent, the first vent and the second vent is covered with a dustproof member having a heat
radiation ventilating property. BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter,
embodiments of the present invention will be described in detail with reference to the drawings.
First, a first embodiment will be described using FIGS. 1 to 4. The present embodiment is a
modification of a part of the speaker apparatus shown in FIGS. 6 to 8 described in the section of
the prior art, that is, the holder part and the bobbin part, and the other parts are the same. In
order to avoid this, the same reference numerals are attached and the changed portions will be
described in detail. The speaker apparatus according to the first embodiment is an application of
the present invention to a speaker apparatus having a repulsion type magnetic circuit, and the
whole is shown in FIG. 1, the holder is shown in FIG. 2, and the bobbin is shown in FIG. A holder
12 is fixed to a central portion of the frame 1 configured as shown and having a funnel-like
appearance, and a magnetic gap portion is formed inside thereof.
The holder 12 has a tubular appearance with a closed upper end, and has a flange portion 12 a
at the periphery of the open portion and a center portion 12 b projecting from the inner bottom
portion, and the upper surface of the center portion 12 b The magnet 3, the plate 4 and the
magnet 3 are formed in a laminated state to form a magnetic forming portion, and a ring 7 is
disposed on the outer peripheral surface of the plate 4 so as to be opposite to each other with a
predetermined interval. A cylindrical bobbin 13 is inserted in an annular magnetic gap portion
formed between the outer peripheral surface of the plate 4 and the inner peripheral surface of
the ring 7, and the upper portion of the bobbin 13 is inward of the damper 5. The voice coil 14 is
fixed to the inner periphery of the diaphragm 9, the voice coil 14 is wound around the middle
portion, and four extending portions 13a are provided at the lower portion in the circumferential
direction. The bottom of the holder 12 is perforated so that each of the four extending portions
13a can penetrate, and a vent 12c communicating with the magnetic gap portion is provided.
When an audio signal is supplied to the voice coil 14 through the terminal plate 11, the bobbin
13 is driven in the vertical direction in the magnetic gap portion in the holder 12, and the
diaphragm 9 is vibrated accordingly. The noise is emitted. At this time, even if the bobbin 13 is
driven to the lowermost position, the extending portion 13a provided at the lower end thereof
only enters the inside of the vent 12c, and the bobbin 13 does not collide with the inner wall of
the holder 12 . When a voice signal with a large level is supplied to the voice coil 14 and heat is
generated, the heat is transmitted to the peripheral surface of the members of the magnet 3 plate
4 and the like forming the magnetic gap through air and to the bobbin 6. The air is also cooled
by being transmitted, and at the same time, the vent 12c communicating with the magnetic gap
portion is cooled efficiently because it is in contact with the outside air. Accordingly, the
resistance of the voice coil 14 is increased due to heat generation and the current is decreased,
so that the output sound pressure corresponding to the audio signal input can not be obtained,
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the voice coil 14 becomes high temperature, and carbonization loss of the insulating film occurs.
Cause an electrical short circuit, coil wires and the bobbin 13 peel off and collide with the outer
peripheral surface of the plate 4 or the inner peripheral surface of the ring 7 to generate
abnormal noise and disconnection, or the voice coil 14 itself There is no chance of burnout and
disconnection. In the embodiment described so far, the vent hole 12 c communicating with the
magnetic gap portion is provided on the lower surface of the holder 12, but in addition to this,
the vent hole is also provided on the side portion of the holder 12. May be
That is, as shown in FIG. 4, the holder holder 15 fixed to the central portion of the frame 1
having a funnel-like appearance has a cylindrical external appearance in which a magnetic gap is
formed inside and the upper end is closed. , And has a center portion 15b having a flange portion
15a at the periphery of the open portion and projecting from an inner bottom portion, and
forming a magnet 3, a plate 4 and a magnet 3 in a stacked state on the upper surface of the
center portion 15b. A ring 7 is formed on the outer peripheral surface of the plate 4 with a
predetermined distance therebetween. In the annular magnetic gap portion formed between the
outer peripheral surface of the plate 4 and the inner peripheral surface of the ring 7, a cylindrical
bobbin having an extension 13a similar to that shown in FIGS. 1 and 3 13, the upper portion of
the bobbin 13 is fixed to the inner side of the damper 5 and the inner periphery of the
diaphragm 9, and the voice coil 14 is wound around the middle portion. The bottom of the holder
15 is provided with a first vent 15c communicating with the magnetic gap, as well as being
drilled so that each of the four extending parts 13a can enter. Furthermore, a second vent 15d
communicating with the magnetic gap portion is drilled on the side surface of the holder 15 in a
state where it is added. Therefore, when a voice signal with a large level is supplied to the voice
coil 14 to generate heat, the heat is transmitted to the peripheral surface of the members of the
magnet 3 plate 4 and the like forming the magnetic gap through air, It is cooled by being
transmitted also to the bobbin 13, and at the same time, the first vent 15c communicating with
the magnetic gap portion is efficiently cooled because it is in contact with the outside air. At the
same time, the second air vent 15d provided on the side wall of the holder 15 is also cooled
efficiently because it is in contact with the outside air. Accordingly, heat generation of the voice
coil 14 causes the resistance value to increase and the current to decrease, so that the output
sound pressure corresponding to the audio signal input can not be obtained, or the voice coil 14
becomes high temperature to carbonize the insulating film. An electrical short circuit may occur
due to burning, coil wires and the bobbin 13 peel off and collide with the outer peripheral
surface of the plate 4 or the inner peripheral surface of the ring 7 to generate abnormal noise
and disconnection, or the voice coil 14 itself There is no risk of burnout and disconnection.
Although the first vent 15c and the second vent 15d in the present embodiment are not in direct
communication with each other, and the space of the magnetic gap portion is interposed
therebetween, as shown in FIG. It goes without saying that the first vent 16c and the second vent
16d may be formed in the wall surface of the holder 16 having the center 16a and the center
16b, and the both may be directly communicated with each other.
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The vent 12c (see FIGS. 1 and 2), the first vent 15c, the second vent 15d (see FIG. 4), the first
vent 16c, and the second vent 16d described above. In each of 5), in order to prevent dust and
fine iron powder from entering the magnetic gap part and degrading the sound emission
characteristics, cover with a dustproof member having heat dissipation and ventilation, for
example, a net made of a metal material. Is desirable. The idea of the invention so far is not
limited to the above-described embodiment. For example, the magnetic circuit of the speaker is
not only a repulsion type but also an external magnet type or an internal magnet type. Of course,
any of the examples constructed using this method is different. As is apparent from the above
description, in the speaker device according to the present invention, the holder having the
magnetic gap portion is provided with the vent and the lower portion of the bobbin is provided
with the extending portion. The heat generated by the voice coil is transmitted via air to the
circumferential surface of the magnet or other member forming the magnetic gap portion, and is
also cooled by being transmitted to the bobbin whose surface area is increased, and at the same
time, the magnetic Since the vent communicating with the gap portion is in contact with the
outside air, it is efficiently cooled. Accordingly, it is possible to provide a speaker device capable
of efficiently radiating the heat generated in the voice coil. BRIEF DESCRIPTION OF THE
DRAWINGS FIG. 1 is a cross-sectional view showing a structure of a speaker device according to
a first embodiment of the present invention. 2 is a bottom view of the holder shown in FIG. 1; 3 is
a side view of the bobbin shown in FIG. 1; FIG. 4 is a cross-sectional view showing a structure of a
speaker device according to a second embodiment of the present invention. FIG. 5 is a bottom
view showing a holder structure of a speaker device according to a third embodiment of the
present invention. FIG. 6 is a cross-sectional view showing a structure of a conventional speaker
device. 7 is a bottom view of the holder shown in FIG. 8 is a side view of the bobbin shown in FIG.
[Description of the code] 1 Frame 2, 12, 15, 16 Holder 2a, 12a, 15a, 16a Flange 2b, 12b, 15b,
16b Center 3 Magnet 4 Plate 5 Damper 6, 13 Bobbin 7 Ring 8, 14 Voice coil 9 diaphragm 9a
edge 12c vent 13a extension 14 voice coil 15c, 16c first vent 15d, 16d second vent
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