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DESCRIPTION JPH0629299

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DESCRIPTION JPH0629299
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
electrodynamic speaker unit for use in a high temperature environment, and more particularly to
a speaker unit for high temperature having a structure excellent in cooling a voice coil.
[0002]
2. Description of the Related Art A conventional electrodynamic speaker converts input into voice
by vibration of a voice coil, but most of it is converted into heat along with voice conversion. As a
result, the temperature of the voice coil rises. In a high temperature environment, the
temperature rise of the voice coil becomes more intense, which leads to the wire film breakage of
the coil and causes a short circuit between the coils. Conventionally, in order to solve this
problem, in order to cool the voice coil by the flow of air due to the vibration of the voice coil or
to promote heat dissipation, a fin is not attached to the lower part of the voice coil or the coil is
not wound. A radiation fin is provided in the part.
[0003]
However, attaching fins to the lower part of the conventional voice coil or providing radiation
fins to the unwound portion of the coil means that these fins form the gap of the magnetic
circuit. There are problems that it can not be thicker than the winding of the coil, it can not take
a stroke because it hits the magnetic circuit part, it is expensive to manufacture, and the
assembly of the speaker unit is difficult.
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[0004]
The present invention has been made in view of these points, and the size of the fins can be set
freely regardless of the gap of the magnetic circuit, sufficient stroke can be taken, and the
manufacturing cost can be reduced. It is another object of the present invention to provide a high
temperature speaker unit which makes the assembly of the speaker unit very easy.
[0005]
SUMMARY OF THE INVENTION In order to solve the above problems, the high temperature
speaker unit according to the present invention is an electrodynamic high temperature speaker
unit used under a high temperature environment, in which the top of the voice coil bobbin is not
provided. A fin made of a magnetic material is placed, and a damper having air permeability is
provided between the voice coil bobbin and the frame, and air stirring by the fin accompanying
the vertical movement of the voice coil bobbin causes air in the vicinity of the voice coil Is moved
out of the gap of the magnetic circuit through the damper to promote cooling of the voice coil.
[0006]
[Operation] A fin formed of a nonmagnetic material is attached to the top of the voice coil bobbin
of the electrodynamic speaker unit.
In addition, the voice coil is supported so as to freely move in the vertical direction by a damper
which is made of a coarse air-permeable member or a through-hole provided to improve the flow
of air.
With the vertical movement of the voice coil by the input, the air in the vicinity of the voice coil
moves out through the gap of the magnetic circuit and the damper by the stirring action of the
air by the fins.
The air flow cools the voice coil in the gap of the magnetic circuit and suppresses the
temperature rise.
[0007]
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DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present
invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view
of an electrodynamic high temperature speaker unit according to the present invention. In the
figure, reference numeral 1 denotes a high temperature speaker unit. The plate 7, the magnet 8
and the yoke 9 constitute a magnetic circuit. A voice coil bobbin 12 in which the voice coil 11 is
wound is inserted in the gap of the magnetic circuit. The voice coil bobbin 12 is supported by the
diaphragm 4 at the top and by the damper 10 at the center. The damper 10 has high air
permeability, is made of a coarse material, and has holes 14 for ventilation. The diaphragm 4 is
supported at its outer edge by the diaphragm edge 3, and this diaphragm edge 3 is fixed to the
frame 6 by a gasket 5. The center cap 2 is attached to the center of the diaphragm 4. The fin 15
which is an important element of the present invention is mounted on the voice coil bobbin 12.
[0008]
Next, the operation will be described. When the voice coil 11 reciprocates in the vertical direction
by the input signal, the fin 15 also vibrates along with the movement. The air stirring action of
the fins 15 forces the air in the vicinity of the voice coil 11 to flow. That is, the air in the voice
coil bobbin 12 generates an air flow 13 through the gap of the magnetic circuit and the hole 14
of the damper 10 as indicated by the arrow, and the voice coil 11
[0009]
Thus, for example, a heat-resistant paper or a heat-resistant resin film is attached to the top of
the voice coil to form a cooling fin, and the surrounding air is cooled by the vibration of the fin to
prevent temperature rise due to heat generation of the coil. It is. According to this invention,
since the fins are positioned above the connection portions of the diaphragm and the damper in
order to attach the fins to the top of the voice coil bobbin, the problem of the stroke is solved,
and the assembly of the speaker unit In order to carry out in the same way, it can be carried out
according to the conventional procedure without changing the working process. Therefore, the
speaker unit used in the vicinity of the automobile engine or muffler of the noise canceller
system or the speaker unit used in the heat exhaust duct is exposed to high temperatures either
entirely or partially. It does not happen very often. However, cooling by the air flow 13 is
effective for cooling the voice coil 11 of the high temperature speaker unit 1 used in such a high
temperature environment, and the cooling effect of the air stirring operation of the fins 15 is
large. is there.
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[0010]
FIG. 2 is a plan view of a fin according to a first embodiment of the present invention and a
sectional view taken along the line A-A of this plane. In the figure, reference numeral 15 denotes
the entire fin, and a hole 15a is provided at the central portion of the film portion 15b. The film
portion 15 b is a thin film-like film fin, and the vibration causes the film portion 15 b to shake,
thereby stirring air in the vicinity. This swing does not occur when the film portion 15b is a hard
material.
[0011]
FIG. 3 is a plan view of a fin according to a second embodiment of the present invention. In the
drawing, reference numeral 16 denotes the entire fin, and a hole 16a is provided in the central
portion of the film portion 16c, and a plurality of holes 16b are provided in the film portion 16c.
The material of the film portion 16c is a harder material than that of the first embodiment, and
for example, paper or the like is used. Although the deflection of the film portion 16c is inferior
to that of the first embodiment, the effect of stirring air due to the presence of the holes 16b is
large.
[0012]
FIG. 4 is a plan view of a fin according to a third embodiment of the present invention. In the
figure, 17 shows the whole fin, and has the notch 17a and the tongue 17b. Also in the third
embodiment, the vibrating portion is the tongue 17b using a material such as a hard paper, and
the stirring effect of the air due to the swing of the tongue 17b is larger than that of the second
embodiment.
[0013]
As described above, in the high-temperature speaker unit according to the present invention, a
fin formed of a nonmagnetic material is placed on the top of the voice coil bobbin, and air
permeability is provided between the voice coil bobbin and the frame. A damper is provided, and
air in the vicinity of the voice coil is moved out of the gap of the magnetic circuit and the damper
by the stirring action of the air by the fin accompanying the movement of the voice coil bobbin in
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the vertical direction. Since the size of the fins can be set freely to a certain extent, sufficient
stroke can be taken, the assembly of the speaker unit becomes very easy, and the manufacturing
cost can be reduced.
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