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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing an embodiment
of a loudspeaker according to the present invention. DESCRIPTION OF SYMBOLS 1 ... flame |
frame 2 ... end suspension 3 ... bobbin 4 [4] york Brenide 5 voice coil 7 pipe for introducing gas,
pipe for discharging gas, 9 ... center pole, 10 ... permanent magnet.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrodynamic
loudspeaker with high input resistance characteristics-as a transducer for converting electrical
energy into a relatively large level of acoustic energy, so-called spy force, Various 1 · 717
depending on its conversion function? No./types are known, but electrodynamic speakers are
mostly used in addition to speakers requiring noify characteristics. On the other hand, it has
become easier to generate large-scale audio signals by means of cattle-conductor amplifiers9,
and in addition to the need for speakers with higher output for public address applications and
monitors, etc. It is necessary to have large input resistance characteristics. However, in the
electrodynamic speaker, a considerable portion of the power supplied to the speaker is lost in the
movable coil 2), and the movable coil generates heat during operation to cause a marked
temperature rise, so a large resistance Movable coil to give input characteristics. At zero points
where heat must be dissipated, the moving coil of the electrodynamic speaker must be held so as
to be able to move freely within the magnetic air gap, so the loss occurs in the moving coil due to
losses. Since heat is dissipated in the path of passing the surrounding air and escaping to the
members that make up the magnetic circuit 2, it is difficult to dissipate the heat sufficiently, so
the moving coil There is a drawback that large input withstand characteristics can not be
obtained unless the size is increased. An object of the present invention is to provide an
electrodynamic speaker having a relatively small movable coil and capable of obtaining a large
input withstand characteristic, except for the above-mentioned drawbacks of the prior art. To this
end, the invention is characterized in that the dissipation of heat from the moving coil is carried
out through a gas of high thermal conductivity such as air. Hereinafter, an embodiment of a
loudspeaker according to the present invention will be described with reference to the drawings.
The figure shows an embodiment of the present invention, which is applied to a dome-shaped
dynamic speaker, and shows a necessary part in a cross-sectional view. In the figure, 1 is a 7-inch
A 2 fly suspension made of a light alloy or the like, 3 is a coil 4'- 3 'bobbin, 4 is a yoke plate
constituting a magnetic circuit, 5 is a voice coil, and 6 is a voice. The cavity formed by the yoke
plate 1 and the edge suspension 2 in front of the coil 5 (left side in the figure), 7 is a pipe for
introducing gas, 7 'is a hole for pyog, 8 is a pipe for exhausting gas, 8' is a pipe Reference
numeral 8 denotes a hole, 9 denotes a center pole, 10-line ring-shaped permanent magnet, 11a is
a cavity formed by the center ball 9 and the ring-shaped permanent magnet 10, 12 denotes a
dome-shaped diaphragm 13 inside the diaphragm 12 and the bobbin 3 A hollow portion formed
by the center ball 9, 14 is a resin for filling the front surface of the diaphragm 12 and having a
resin for 9 days, and 15.15 'is a tube for introducing a gas.
Next, the operation will be described. When using this speaker, it is installed with the illustrated
state, that is, the pipe 8 is on the lower side. Then air from pipe 7 through tube 15. A gas having
a high thermal conductivity, such as hydrogen gas, helium gas, or a mixture of these, is
introduced into the cavity 6 slowly. Then, the gas whose heat transfer force is higher than these
air also exists in the reservoir 9 at the upper part of the cavity 6 and the cavity 11
communicating with it, since the specific gravity is higher than that of the air. Excess air is
discharged from the pipe 8 in place of the air that has been used. As the volume of gas fed from
the pipe 7 gradually increases, the upper portions of the cavities 6 and 11 are all replaced with
gas, and the air in the cavity 13 also begins to be replaced with gas, The air under the cavity 11
where the 8 is provided is also exhausted, and finally the cavity 6 is 12 except for the portion of
the cavity 11 below the portion where the pipe 8 is provided. And most of the cavity 11 is
replaced with the gas introduced from the pipe 7 ○, the magnetic gap formed by the sensor pole
9 in the hole 4 of the yoke plate 4 is completely filled with the above gas The voice coil 5 and the
bobbin 3 are also completely wrapped by this gas, and this air is It operates in a high
thermal conductivity gas. In this state, if signal current is flowed to the voice coil 5 of Spica to
operate it, a loss due to the resistance outside the voice coil 5 or the like occurs 9, heat
corresponding to it is generated and the temperature of the voice coil 5 rises. As a result, heat
flows to the yoke plate ridge and the center pole 9 through the gas in contact with the voice coil
5 and is dissipated. Further, a part of the heat flows from the voice coil 5 to the bobbin 3 and
flows around the gas n 1 and escapes to the yoke plate 4 and the center pole 9. The heat
dissipation path from this voice coil 5 is almost the same as that of the conventional example, but
the heat transfer from the gas and the metal such as the yoke □ plate 4 and the center pole 9
differs by 4 years at the & end, In the prior art, it is difficult to provide a large input resistance
characteristic because a portion flowing through the air generates a large temperature gradient
and the temperature of the voice coil is greatly increased. "In the embodiment of the present
invention, the magnetic gap portion including the voice coil 5 is entirely filled with hydrogen gas
or helium gas.
And when comparing the thermal conductivity of these gases and air, there are differences as
shown in the following table. Thermal conductivity (kX1G'J / s + 8'K)-mochi 11: air 2,413.17
Helium 14.1517.06 hydrogen 16 + 842 160 1984 edition chronology chart, that is, the
embodiment of the present invention Thus, if the surroundings of the voice coil 5 are filled with
hydrogen gas or helium gas, the thermal conductivity of these gases is 5 to 7 times that of air, so
the temperature gradient of Kumamoto from the voice coil 5 is also the same. 5 to 7 times more
flow than in the case of this air. Even if the loss is the same, the temperature rise can be reduced
to 115 to 1/7 in the case of air. Therefore, according to the embodiment of the present invention,
a speaker having a voice coil of almost the same size can be provided with an input of several
times or more of the power allowed in the conventional example, and a large sound output can
be obtained. It is possible to easily obtain a speaker having excellent input resistance
characteristics. In the above embodiments, the pipe 7 for introducing the waste was provided on
the upper part of the cavity 6, but the introduced gas The air can be replaced, and finally the
same effect can be obtained by introducing the gas from any cavity to the force that the magnetic
9 bite including the voice coil 5 can be completely filled with the gas by the light. It goes without
saying that the number of tracks 7 is not limited to one, and several canes may be used. And in
any case, what is essential to the implementation of the present invention is the magnetism
including the voice coil 5 among the hollow portions "6, 11.13" when the speaker is installed in
the use state. By providing the gas discharge port of the pipe 8 at a position having a portion
located below the air gap, the function and effect of the present invention can be sufficiently
exhibited by this. In addition, after filling the gas from the pipe 7 as described above, the gas may
be sealed as it is, but hydrogen gas or helium gas has a light specific gravity so that it leaks even
if it is strictly sealed. The gas may be replenished little by little from 7. Since the amount of gas
replenishment at this time is very small, an increase in running cost is hardly a problem.
Furthermore, although a dome-shaped speaker has been shown in the above embodiment, the
embodiment of the present invention is not limited to this, and any speaker having a voice coil,
that is, a structure in which a magnetic gap including a movable coil is partitioned from the
outside It is needless to say that the present invention is also applicable to a speaker. As
described above, according to the present invention, since the heat radiation from one movable
coil can be sufficiently large according to the present invention, a large input can be given to a
relatively small speaker 1 mound to obtain a large acoustic output except for the drawbacks of
the prior art. It is possible to easily obtain a speaker that can withstand high input resistance.
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