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DESCRIPTION JP2013223123

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DESCRIPTION JP2013223123
Abstract: To provide a "speaker" which can be installed and used in a high temperature
environment. A speaker 10 is provided with a case 10 containing a magnetic circuit 2, a voice
coil 3, a diaphragm 4 and the like in an engine room S1 of a car, and a duct 11 projecting
outward from the case 10 The reproduced sound is emitted to the vehicle interior space S2. A
metal body frame is present as a partition 30 between the engine room S1 and the vehicle
interior space S2, and the duct 11 is inserted into the hole 31 of the partition 30 to make the
sound emission opening 11a the vehicle interior space S2. To make The case 10 is provided with
a heat release opening 10a for exposing the end face 2a of the magnetic circuit 2 on the side of
the partition wall 30, and the elastically deformable heat transfer sheet member 15 fitted into the
heat release opening 10a is a magnetic circuit 2 Between the end face 2a and the partition wall
30 so as to be in pressure contact with the two 2a and 30. [Selected figure] Figure 2
スピーカ
[0001]
The present invention relates to an electrodynamic loudspeaker suitable for use in vehicles and
the like, and more particularly to a loudspeaker which can be installed and used in a high
temperature environment such as an engine room.
[0002]
If a relatively large vehicle-mounted speaker such as a subwoofer for low-pitched sound is
installed in the vehicle compartment, the space available in the vehicle compartment will be
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narrowed, so in recent years, the speaker has been installed in the space outside the vehicle
compartment. A method is adopted in which the reproduced sound generated by the speaker is
emitted to the space in the vehicle compartment through the opening provided in the chamber
wall.
However, in many cases, it is difficult to provide a large opening facing the diaphragm of the
speaker on the cabin wall.
[0003]
Therefore, conventionally, a duct is protrusively provided in a case (cabinet) which is an outer
shell member of the speaker, and the duct is inserted into a hole portion of a wall of the vehicle
compartment to obtain a space in the case of the speaker installed outside the vehicle. A
technique has been proposed in which a space in a vehicle cabin is communicated with (see, for
example, Patent Document 1). In such a conventional speaker, since the reproduced sound
emitted in the case is emitted from the open end on the tip end side of the duct to the vehicle
interior space which is the acoustic space, the open end of the duct becomes a sounding opening.
[0004]
International Publication WO 2011/0174435 Brochure
[0005]
By the way, when installing a speaker out of the vehicle exterior of a car, although the inside of a
trunk room, an open / close door etc. is often used as the installation space, a comparatively
large surplus space which can install a speaker also in an engine room exists.
However, when the speaker is installed in a high temperature environment such as an engine
room, the voice coil may become excessively hot, and the neodymium (Nd) magnet used in the
magnetic circuit may be demagnetized. Problems are likely to occur. Therefore, when the speaker
is installed in a high temperature environment such as an engine room, it is necessary to take
special measures against heat radiation to efficiently dissipate the heat of the speaker.
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[0006]
The present invention has been made in view of the circumstances of the prior art as described
above, and its object is to provide a speaker which can be installed and used in a high
temperature environment.
[0007]
In order to achieve the above object, according to the present invention, a magnetic circuit
having a magnetic gap, a voice coil disposed in the magnetic gap, and a diaphragm that vibrates
integrally with the voice coil are housed inside a case. And a duct having a sound-producing
opening that causes an opening end on the tip end side to protrude into the acoustic space is
provided in the case so as to protrude, and the case is separated from the acoustic space by the
partition wall. In the speaker installed in a space and attached to the hole provided in the
partition with the duct inserted therethrough, the case is provided with a heat release opening
for exposing the end face of the magnetic circuit on the partition side, The heat transfer sheet
member is inserted into the heat release opening, and the heat transfer sheet member is held
between the end face of the magnetic circuit on the side of the partition wall and the partition
wall. It was.
[0008]
The metal partition that separates the extra-wall space under high temperature environment
where the case of the speaker is installed and the acoustic space where the sound emission
opening of the duct of the speaker is exposed can function as a heat sink because the heat
capacity is large. it can.
Focusing on this point, if the speaker is configured such that the heat transfer sheet member is
held between the end face of the magnetic circuit on the partition side and the partition, the
voice coil stored in the case is generated Can be efficiently dissipated to the partition wall
through the heat transfer sheet member.
Therefore, even if the extra-wall space where the speaker is installed is in a high temperature
environment such as an automobile engine room, it is possible to suppress the temperature rise
of the voice coil and the magnetic circuit and maintain good speaker performance. Become. In
addition, although the neodymium magnet of the magnetic circuit used under high temperature
environment is usually added with dysprosium (Dy) to improve heat resistance, temperature rise
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of the magnetic circuit is suppressed even under high temperature environment If the heat
dissipation structure is adopted, the cost of the speaker can be reduced because the amount of
expensive dysprosium added can be reduced.
[0009]
In the above-mentioned speaker, it is preferable to use a silicon-based heat transfer sheet which
is excellent in thermal conductivity and flame retardant as the heat transfer sheet member. In
addition, when a part of the magnetic circuit is inserted into the heat dissipation opening of the
case, the magnetic circuit can be positioned with respect to the case only by fitting into the heat
dissipation opening, so that the assemblability of the speaker is improved. In particular, it is
preferable that a yoke, which is a component of the magnetic circuit, be inserted into the heat
dissipation opening, and a flat surface of the yoke be exposed in the heat dissipation opening. In
addition, when the case is fixed to the partition wall using a metal mounting screw, the heat
accumulated in the case can be dissipated to the partition wall through the mounting screw, and
the heat transfer sheet member It is preferable because the partition wall can be reliably pressed.
[0010]
In the speaker according to the present invention, the heat transfer sheet member which can be
elastically deformed is inserted into the heat release opening provided in the case, and the metal
external space outside the wall under high temperature environment where the case is installed
is separated from the acoustic space. The speaker can be attached in a state in which the heat
transfer sheet member is sandwiched between the partition wall and the end face of the magnetic
circuit housed in the case. Thereby, since the partition can be used as a heat sink, the heat of the
voice coil and the magnetic circuit can be efficiently dissipated to the partition through the heat
transfer sheet member. Therefore, even if a relatively large, high-output vehicle-mounted speaker
such as a subwoofer is installed in the engine room, the body frame, which is a partition,
functions as a heat sink with a very large heat capacity, so voice coils and magnetic circuits
Temperature rise can be suppressed and good speaker performance can be maintained.
[0011]
It is a perspective view showing the appearance shape of the speaker concerning the example of
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an embodiment of the present invention. FIG. 2 is a cross-sectional view showing the speaker
installed in an engine room of a car. It is a characteristic view which shows the temperature
change of the voice coil shown in FIG. 2, and a yoke with a comparative example. It is a principal
part perspective view which shows the hole for the ducts provided in the partition shown in FIG.
[0012]
Hereinafter, embodiments of the present invention will be described with reference to the
drawings. The speaker 1 according to the embodiment of the present invention is a vehiclemounted subwoofer, and as shown in FIG. 2, the speaker 1 is installed in an engine room S1 of a
car, and the reproduction sound generated by the speaker 1 is in the vehicle interior space S2. It
is released into the A metal body frame is present as a partition 30 between the engine room S1
and the vehicle interior space S2. A case 31 of the speaker 1 is provided in a hole 31 (see FIG. 4)
provided in the partition 30. The duct 11 which protrudes outward from this is penetrated. That
is, the speaker 1 uses the engine room S1 as the installation space, and the opening end on the
tip end side of the duct 11 inserted in the partition wall 30 is the sounding opening 11a, and the
sounding opening 11a is an acoustic space The vehicle interior space S2 is exposed. In addition,
although the duct 11 and the hole 31 have the same shape, in this case, the hole 31 conforming
to the shape of the duct 11 may be opened in the partition 30, but a hole (for example, a hole
already formed in the partition 30) The duct 11 may be formed in a shape that can be inserted
into the ventilation hole).
[0013]
The speaker 1 includes a magnetic circuit 2 having a magnetic gap G, a voice coil 3 disposed in
the magnetic gap G and driven by electromagnetic interaction when energized, and a
substantially conical shape vibrating in synchronization with the voice coil 3 Diaphragm 4, ringshaped damper 5 elastically supporting voice coil 3 and diaphragm 4, and case 10 housing
magnetic circuit 2, voice coil 3, diaphragm 4 and damper 5, etc. The magnetic circuit 2 is fixed to
the case 10 mainly by a duct 11 and a rear duct 12 provided in the case 10 so as to protrude
therefrom. When the speaker 1 is installed in the engine room S1, the opening end (sounding
opening 11a) at the tip end of the duct 11 is exposed to the vehicle interior space S2, but the
opening end at the tip end of the back duct 12 is the engine room Make S1 appear.
[0014]
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The magnetic circuit 2 includes a magnet 6 and a yoke 7 which form a magnetic path. In the
present embodiment, the yoke 7 comprises a bottomed cylindrical outer yoke 7a and a diskshaped inner yoke 7b, and the disk-shaped magnet 6 is sandwiched between the yokes 7a and
7b. A magnetic gap G is formed between the inner peripheral surface of the open end of the
outer yoke 7a and the outer peripheral surface of the inner yoke 7b, and the magnetic flux
flowing through the magnetic path of the magnetic circuit 2 crosses the magnetic gap G. There is.
[0015]
The voice coil 3 is wound around a cylindrical bobbin 8 so that voice current can be supplied to
the voice coil 3 through a lead wire (not shown). The inner peripheral portion of the diaphragm 4
and the inner peripheral portion of the damper 5 are bonded and fixed to an end of one end side
(antimagnetic gap G side) of the bobbin 8, and the end of the bobbin 8 is a dustproof cap 9. It is
closed by The diaphragm 4 is made of cone paper or the like, and the outer peripheral portion of
the diaphragm 4 is held by the case 10 via the edge damper 13. The outer peripheral portion of
the damper 5 is also held by the case 10.
[0016]
In the present embodiment, the diaphragm 4 is shaped so as to widen toward the right side of
FIG. 2, and the diaphragm 4 is disposed around the magnetic circuit 2, so the speaker 1 is
thinned. ing. However, it is also possible to arrange the diaphragm 4 in a direction opposite to
that in FIG. 2 (a shape that widens toward the left side in FIG. 2). Further, it is also possible to
form the voice coil 3 in a cylindrical shape and omit the bobbin 8.
[0017]
The case 10, the duct 11 and the rear duct 12 are all molded products made of synthetic resin,
and these three parties 10, 11 and 12 are integrated using a fixing means such as screwing. The
case 10 forms a flat box-like body, and the duct 11 and the rear duct 12 are provided so as to
project from the case 10 so that the projecting directions are opposite to each other. In the case
10, a heat radiation opening 10a is opened at the center of the surface (the surface where the
duct 11 protrudes) facing the partition wall 30, and the flat bottom surface of the outer yoke 7a
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is exposed in the heat radiation opening 10a. I am doing it. The heat release opening 10a is
cylindrical and protrudes in the same direction as the duct 11, and the outer yoke 7a is fixed in a
state where the bottom surface side is fitted into the heat release opening 10a. Further, the heat
transfer sheet member 15 having high thermal conductivity is inserted into the heat release
opening 10 a, and as shown in FIG. 2, the heat transfer sheet member 15 is transferred between
the end face 2 a of the magnetic circuit 2 on the partition wall 30 side and the partition wall 30.
The thermal sheet member 15 is interposed in a state of pressure. The heat transfer sheet
member 15 is obtained by cutting a flame retardant and elastically deformable silicon heat
transfer sheet into a disk shape having a diameter equal to the inner diameter of the heat release
opening 10a (see FIG. 1). The end face 2a of the magnetic circuit 2 corresponds to the bottom of
the outer yoke 7a.
[0018]
The duct 11 is for guiding the reproduction sound generated by the speaker 1 installed in the
engine room S1 to the vehicle interior space S2. Further, the rear duct 12 opening toward the
engine compartment S1 is provided to adjust the back pressure in the case 10.
[0019]
A plurality of mounting holes 10b (see FIG. 1) are provided in the outer peripheral edge portion
of the case 10, and the case 10 is formed by fastening metal mounting screws 20 (see FIG. 2)
inserted through these mounting holes 10b. Are fixed to the partition wall 30.
[0020]
In the speaker 1 thus configured, when the voice current is supplied to the voice coil 3 disposed
in the magnetic gap G, the voice coil 3 is driven in the left and right direction of FIG. 2 by a
known electromagnetic interaction. The air in the case 10 is vibrated by the diaphragm 4
interlocked with the voice coil 3, and the reproduced sound is emitted from the sound generation
opening 11a of the duct 11 to the vehicle interior space S2.
[0021]
In addition, since the speaker 1 installed in the high temperature environment of the engine
room S1 needs special measures for heat radiation, as described above, the case 10 is provided
with the radiation opening 10a for exposing the end face 2a of the magnetic circuit 2. In
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addition, the heat transfer sheet member 15 fitted into the heat release opening 10 a is
sandwiched between the end face 2 a of the magnetic circuit 2 and the partition wall 30.
That is, in the process of fixing the case 10 in the engine room S1 to the partition wall 30 by
fastening the mounting screw 20, the heat transfer sheet member 15 fitted in the heat release
opening 10a is elastically deformed and compressed. The heat sheet member 15 is reliably in
pressure contact with the end face 2 a of the magnetic circuit 2 and the partition wall 30.
Thereby, the heat of the voice coil 3 and the magnetic circuit 2 in the engine room S1 can be
easily transmitted to the partition wall 30 through the heat transfer sheet member 15. Moreover,
since the partition wall 30 which is a vehicle body frame is made of metal and has a very large
heat capacity, the heat of the voice coil 3 and the magnetic circuit 2 can be efficiently dissipated
to the partition wall 30.
[0022]
FIG. 3 shows the result of measuring the temperature change of the voice coil 3 and the yoke 7
in the engine room S1 with the passage of time (minutes) after the start of energization of the
audio current at an input voltage of 10 volts. The temperature change of the vehicle is indicated
by a symbol A, the temperature change of the yoke 7 by a symbol B, and the temperature change
of the vehicle interior by a symbol E. Further, as a comparative example, the temperature change
of the voice coil 3 and the yoke 7 in the case where the heat transfer sheet member 15 is
removed and the space between the end face 2a of the magnetic circuit 2 and the partition wall
30 is an air layer is also measured. In FIG. 3, the temperature change of the voice coil 3 in the
comparative example is indicated by a symbol C, and the temperature change of the yoke 7 is
indicated by a symbol D.
[0023]
As apparent from FIG. 3, in the comparative example, the temperature of the voice coil 3 rises to
about 170 ° C. and the temperature of the yoke 7 also rises to about 80 ° C. in about one hour
after the start of energization. Therefore, there is a possibility that the voice coil 3 may be
disintegrated or the magnet (neodymium magnet) 6 of the magnetic circuit 2 may be
demagnetized. On the other hand, if the heat can be efficiently dissipated to the partition wall 30
through the heat transfer sheet member 15 as in the present embodiment, the temperature of the
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voice coil 3 is 120 even if approximately two hours have passed since the start of energization.
C., and the temperature of the yoke 7 is also maintained at about 40.degree. Therefore, it is
understood that there is no possibility that the voice coil 3 is disintegrated or the magnet 6 is
demagnetized, and the speaker 1 installed in the high temperature environment of the engine
room S1 can be used without any problem.
[0024]
As described above, in the speaker 1 according to the present embodiment, the heat transfer
sheet member 15 which can be elastically deformed is inserted into the heat release opening 10
a provided in the case 10, and the high temperature environment in which the case 10 is
installed The heat transfer sheet member 15 is held between the metallic partition wall 30
separating the engine room S1 of the first embodiment from the acoustic space S2 and the end
face 2a of the magnetic circuit 2 housed in the case 10 Is attached. By doing this, the partition
wall (body frame) 30 having an extremely large heat capacity can be made to function as a heat
sink, so that the heat of the voice coil 3 and the magnetic circuit 2 is efficiently dissipated to the
partition wall 30 through the heat transfer sheet member 15 Can. As a result, since temperature
rise of the voice coil 3 and the magnetic circuit 2 in the engine room S1 can be suppressed and
good speaker performance can be maintained, the speaker is a relatively large subwoofer
requiring a high output. 1 can be installed in the engine room S1 and used without any problem.
[0025]
In addition, if the heat dissipation performance of the speaker 1 is enhanced in this manner to
effectively suppress the temperature rise of the magnetic circuit 2 even in a high temperature
environment, it is necessary to enhance the heat resistance of the magnet (neodymium magnet) 6
Since the amount of expensive dysprosium added can be reduced, the cost of the speaker 1 can
be reduced.
[0026]
Furthermore, in the present embodiment, the case 10 of the speaker 1 is fixed to the partition
wall 30 using the metal mounting screw 20.
Therefore, the heat accumulated in case 10 can be dissipated to partition wall 30 via mounting
screw 20, and heat transfer sheet member 15 can be reliably pressed against partition wall 30
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along with the fastening operation of mounting screw 20. Also from this point, high heat
dissipation effect is obtained.
[0027]
Further, in the present embodiment, since the magnetic circuit 2 is fixed to the case 10 in a state
in which the bottom surface side of the outer yoke 7a is inserted into the heat release opening
10a, the magnetic circuit 2 can be easily Positioning can be performed reliably, and the
assemblability of the speaker 1 is improved.
[0028]
In addition, even if it is a speaker installed in high temperature environments other than an
engine room, it is possible to apply this invention and to improve a thermal radiation effect.
Of course, the speaker is not limited to the subwoofer.
[0029]
1 Speaker 2 Magnetic Circuit 2a End Face 3 Voice Coil 4 Diaphragm 5 Damper 6 Magnet 7 Yoke
10 Case 10a Heat Dissipation Opening 11 Duct 11a Sounding Opening 15 Heat Transfer Sheet
Member 20 Mounting Screw 30 Partition 31 Opening 31 S1 Engine Room Space) S2 Car Interior
Space (Acoustic Space) G Magnetic Gap
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