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DESCRIPTION JPH0634396

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DESCRIPTION JPH0634396
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
high temperature speaker unit having improved heat resistance, and more particularly, not a
speaker unit as an audio device for music appreciation but producing high temperature noise, for
example The present invention relates to a high temperature speaker unit for a noise canceller
attached to an exhaust duct and canceling its noise.
[0002]
2. Description of the Related Art Conventionally, in order to improve the heat resistance of a
speaker unit, paying attention to heat generation due to an electrical signal input of a voice coil,
heat dissipation fins are provided outside the magnetic circuit section to release heat generation
of the voice coil. , There was a thing to aim at heat resistance of the speaker.
[0003]
However, in the case of a high-temperature speaker used in a special place, such as one placed
under an environment of 200 ° C. or higher, the heat radiation fin should be used because the
temperature around the speaker is also high. Even if it is used, the heat radiation effect is not
sufficiently exhibited, and the heat resistance of the voice coil becomes extremely low.
[0004]
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1
For example, as shown in FIG. 3, in the active noise canceller system, the frame 6 of the speaker
1 is attached to the exhaust duct 14 and the speaker 1 is a microphone 16 and control circuit
provided on the upstream side in the duct 14 Connected via 17
The microphone 16 inputs noise from exhaust gas of 200 ° C. or higher blown by the blower 18
provided on the upstream side of the duct 14, converts it into a noise signal which is an electric
signal, and outputs it to the control circuit 17. The control circuit 17 converts the noise signal
into a reverse phase signal and outputs it to the speaker 1, and the speaker 1 is driven by the
reverse phase signal to emit sound in the reverse phase of the noise and cancel the noise.
[0005]
In this case, the speaker 1 receives heat of 200 ° C. or more from the front, and also receives
heat conducted from the junction of the duct 14 and the frame 6 and heat around the duct 14.
[0006]
Further, in the active noise canceller system shown in FIG. 4, the sub muffler 20 is provided in
the muffler 19 of the car, the frame 6 of the speaker 1 is attached to the sub muffler 20, and the
speaker 1 is provided upstream of the muffler 19. The microphone 16 is connected via the
control circuit 17, noise is input to the microphone 16 out of exhaust gas of 200.degree. C. or
more, and the signal from the microphone 16 is similarly converted to an antiphase signal by the
control circuit 17. , Output to the speaker 1 to eliminate noise.
[0007]
Also in this case, the speaker 1 receives heat of 200 ° C. or more from the front and also
receives heat conducted from the junction of the sub muffler 20 and the frame 6 and heat
around the muffler 19 and the sub muffler 20. There is.
[0008]
As described above, the use environment of the speaker used for the duct or exhaust duct for the
fan in the factory, the active noise canceller system that actively cancels the noise of the muffler
of the automobile, etc. It will be placed close to or directly connected to the air ducts, exhaust
ducts and automobile mufflers.
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2
In particular, in the case of a speaker that needs to block heat from the front, the conduction heat
from the exhaust duct or the joint between the muffler and the speaker becomes high, the
speaker is heated to 200 ° C. or more, and the heat resistance of the voice coil is extremely low.
Become.
Furthermore, the adhesive of the voice coil and the adhesive of the other parts of the speaker are
conventional acrylic, rubber, epoxy, etc., so there is no heat resistance over 200 ° C and these
adhesives can withstand heat. There is no problem that
[0009]
The present invention has been made focusing on the above problems, and the object of the
present invention is to provide a joint between a high temperature tube such as an exhaust duct
which is the main heat that heats the speaker and the frame of the speaker. Another object of the
present invention is to provide a speaker unit for high temperature which protects the speaker
from high temperature by reducing the conduction heat at the junction of the frame of the
speaker and the plate of the magnetic circuit unit.
[0010]
SUMMARY OF THE INVENTION In order to achieve the above object, according to the present
invention, the frame 6 of the speaker 1 or the frame 6 of the speaker 1 is provided between the
frame 6 of the speaker 1 and the plate 4 of the magnetic circuit. A heat insulating material is
provided between the member to be attached.
[0011]
[Operation] By connecting the frame 6 of the speaker 1 to the plate 4 of the magnetic circuit
through the heat insulating material, the heat transmitted from the member attached with the
frame 6 of the speaker 1 to the frame 6 is transmitted to the frame 6 by the heat insulating
material. C. to prevent the speaker 1 from being heated to 200.degree. C. or more.
Similarly, a heat insulating material is provided between the frame 6 of the speaker 1 and a
member to which the frame 6 is attached, to prevent heat from being transmitted from the
member to the frame 6 of the speaker 1. To prevent it from being heated.
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[0012]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present
invention will be described in detail with reference to the drawings.
FIG. 1 shows an example of a high temperature speaker unit using the present invention.
A speaker 1 is a speaker used in the active noise canceller system shown in FIG.
Reference numeral 2 denotes the yoke, in which a cylindrical pole 2b is formed at the center of
the disc 2a at the bottom, and an annular magnet 3 is fixed to the upper surface of the end of the
disc 2a. Plate 4 is fixed so as to create a gap 3a with respect to the pole 2b. The upper surface of
the plate 4 is formed with a dowel 4a which is a protrusion, and the dowel 4a is inserted into a
dowel hole 6a provided on the bottom of the frame 6 through a heat insulating material 5 which
is a non-woven fabric of polyimide fiber. The plate 4 is spread and fixed to the frame 6.
Polyimide fibers are heat resistant fibers.
[0013]
A cylindrical voice coil 8 is wound at its lower end with a coil 8a, and the lower end is inserted
into the gap 3a so as not to contact the plate 4 or the pole 2a. One end of each of the diaphragm
9 and the damper 7 is adhered to the outer surface of the voice coil 8, and one end of the
diaphragm edge 10 is adhered to the other end of the diaphragm 9. The other end of the
diaphragm edge 10 is bonded to a cone attachment margin 6 b at the upper end of the frame 6.
Further, the other end of the damper 7 is bonded to the bottom surface of the frame 6. A
dustproof center cap 11 is bonded to the central portion of the diaphragm 9.
[0014]
The lower surface of the gasket 12 is bonded to the other end of the diaphragm edge 10, and the
lower surface of the heat insulating material 13 made of polyimide fiber non-woven fabric is
bonded to the upper surface. The heat insulating material 13 is formed to have a large area so
that the gasket 12 and the frame 6 do not directly contact the duct 14. Furthermore, the upper
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4
surface of the heat insulating material 13 is attached to the outer wall of the exhaust duct 14.
The duct 14 is the same as the exhaust duct 14 shown in FIG. 3, and the exhaust gas having a
high temperature of 200 ° C. or higher flows in the duct 14.
[0015]
In the speaker 1, when an electric signal flows through the coil 8a of the voice coil 8, the coil 8a
receives a force by the magnetic field formed by the yoke 2, the magnet 3 and the plate 4, and
the voice coil 8 moves up and down to move the diaphragm 9 Vibrate. The damper 7 supports
the voice coil 8 and holds the voice coil 8 in the center against the vertical movement of the voice
coil 8.
[0016]
Also, the duct 14 is heated by the exhaust gas to a high temperature of 200 ° C. or more. The
heat of the duct 14 prevents the heat conduction to the gasket 12 by the heat insulating material
13, the gasket 12 does not get hot and the frame 6 does not get in direct contact with the duct
14, so the frame 6 does not get hot. Similarly, since the heat insulating material 5 is also between
the frame 6 and the plate 4, the heat conduction from the frame 6 to the plate 4 is also
prevented, and the plate 4 is not heated by the heat of the frame 6.
[0017]
FIG. 2 shows another embodiment, in which the speaker 1 is attached to the inner wall of the
duct 14. The frame 6 of the speaker 1 is attached to the inner wall of the duct 14 via the heat
insulating material 13, and the gasket 12 is fixed to the cone sticking margin 6 b of the frame 6
via the diaphragm edge 10. The heat of the duct 14 is blocked from the heat conduction to the
frame 6 by the heat insulating material 13 as in the embodiment, so the heat of the duct 6 does
not cause the frame 6 to become hot. Moreover, you may use a heat insulating material for the
center cap 11 in this Example and the above-mentioned Example.
[0018]
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The thermal insulators 5 and 13 are not limited to polyimide fibers, and ceramic fibers, Kepler
fibers, and carbon fibers are considered, and those using alumina fibers of ceramic fibers are
available under the trade names of Almax board and Mitsui Mine. Manufactured by Co., Ltd. and
has a heat resistance temperature of 1800 ° C. As a non-woven fabric made of polyimide fiber,
there are those having a trade name of PYROPEL, and those having a heat-resistant temperature
of 300 ° C. manufactured by ALBANY Co., USA. Also, although the heat resistance temperature
is not very high, glass wool was used
[0019]
In the above example, the case where the speaker unit is attached to a high temperature place
and used is described, but it is a matter of course that other use modes may be used.
[0020]
As described above, according to the present invention, a heat insulating material is provided
between the frame of the speaker and the plate of the speaker and between the frame and the
mounting member thereof to block heat conduction, so high temperature The speaker does not
become high temperature by heat conduction even if the speaker is attached to the pipe etc., for
example, the speaker of the active noise canceller system that cancels the sound in the duct such
as the exhaust duct of 200 ° C or more and the duct for blower, It can be used as a speaker of
an active noise canceller system that eliminates the noise of a muffler.
Of course, in this case it is also possible to combine the heat dissipating fins and the heat
insulating material and use the
[0021]
Then, by attaching this heat insulating material, an adhesive having a heat-resistant temperature
of 200 ° C. or less can be used as an adhesive of a voice coil or an adhesive of a speaker such as
a magnetic circuit portion.
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