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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
cooling system for a speaker system which cools the periphery of a voice coil to improve input
characteristics. [Prior Art] FIG. 5 is a cross sectional view showing a conventional example. In the
figure, (1) is a pole piece, (2) is a magnet, and (3) is a top plate, and a magnetic circuit is
configured as in these pole pieces (s, magnet (21,) tubulation (3)). (4) is a voice coil, which is
located in the gap between the top plate (3) and the pole piece (1). (5) is a diaphragm, (6) is a cap
attached to the diaphragm (5). (7) is a spider, which holds the voice coil (4) together with the
diaphragm (5). These voice coil (4), diaphragm (5), cap (6) and spider (7) are referred to as a
vibration system, but the diaphragm (5) and spider (7) of these vibration systems are part of the
main body It is fixed to the frame (8). (9) is a voice coil space surrounded by these magnetic
circuits and a vibration system. Here, since the voice coil 4) has a positive resistance value, Joule
heat is generated by the flowing voice current. The generated heat is transferred to the opposing
pole pieces (1), (2) through the air gap via the air gap and also to the diaphragm (5) and the
spider (7) to raise their temperatures. The temperature rise continues in the case of thermal
equilibrium. Originally, this voice coil space (9) does not contain air, and heat is easily generated.
And, since the heat generation of the vibration system, magnetic circuit, etc. is not good, the
speaker system of large input is In particular, it was easy to get hot. So, as a measure against this
temperature, we have attached a radiation fin to the magnetic circuit or. As it is equal amount in
Japanese Patent Publication No. 53-264g1. A part of the magnetic circuit includes one through
which cooling water is passed. [Problems to be Solved by the Invention] The conventional
apparatus is configured as described above. In the case where there is no heat radiation
countermeasure, if the heat radiation countermeasure is not sufficient, the change of the
electrical characteristics due to the high temperature and the deterioration of the revoiceability
due to the mechanical and physical change such as the thermal strain will occur. In addition, if
the heat dissipation and cooling measures have been sufficiently taken, the whole is absolutely
heavy. Large 9. There are problems such as inconvenience in handling and high price. The
present invention has been made to solve the above-described problems, and it is possible to cool
the voice coil space without increasing the size of the speaker system, and to cool the speaker
system capable of obtaining high-quality re-voices with high input. It is intended to provide a
[Means for Solving the Problems] A cooling device of a speaker system according to the present
invention. An inlet pipe and an outlet pipe are provided in a space surrounded by a magnetic
circuit consisting of a pole piece, a magnet, a top plate, a voice coil of a vibration system, a
support member thereof and a frame for fixing them, And an outlet pipe connected to the inlet
pipe end. [Operation] The pressurized cooling medium in the pressure vessel is depressurized as
it is released and becomes a low temperature waste body by the Joule-Thomson effect, or when
liquefied it further has an effect by the heat of vaporization. It is a low temperature gas. It is
poured into the voice coil space to cool the voice coil which is the heat source in this space.
Embodiments of the present invention will be described below with reference to the drawings.
Fig. 1 shows the overall view of the present invention, Ql) is a speaker system, (II) is a speaker
unit, aa is a cabinet, α $ is a pressure vessel, aa is a pressure flow rate adjustment attached to
the discharge port of pressure vessel 0 Α, α は is a pressure flow regulator (a discharge conduit
attached to 14 ((1 is an inlet pipe for introducing a cooling medium into the voice coil space, an
is a voice coil space ( The outlet pipe to be discharged and the pipe are connected at a connecting
part for releasably connecting the outlet pipe and the inlet pipe, and as shown in the cross
section of the connecting part in FIG. The flare part and the external thread of the inlet pipe end
(2 m are tightened with a bag nut to keep the air tightness. (D) is liquid air which is a cooling
medium sealed in the pressure vessel 0. FIG. 3 is a cross-sectional view showing the inside of the
speaker unit (11), in which the flow of the cooling medium (2) is indicated by an arrow. The
reference numerals in FIG. 9 of the housing are the same as those of the prior art shown in FIG. S
and the reference numerals of the present invention shown in FIG. Part (2) is vaporized in the
pressure vessel to become a low-temperature high-pressure gas. The high pressure gas is
depressurized as it passes through the pressure flow control pulp a4, and the Joule-Thomson
effect reduces the temperature of the low temperature gas and the discharge conduit a! 9. The
voice coil (4) which is a heat source and the members around it are cooled while flowing in
parallel flow as shown by the arrows through the connection part a sand, the inlet pipe + III, and
the outlet pipe It is released to the atmosphere on the low pressure side which is the outside of
the cabinet a via the aD. FIG. 4 is a cross-sectional view showing the inside of a speaker unit a 'of
another embodiment, and the reference numerals in FIG. 91 are the same as the reference
numerals of the embodiment shown in FIG.
In this embodiment, the center of the ball bead 11) is axially pulled out to connect the inlet pipe
aO to one end. Further, a plurality of holes are machined in the circumferential direction as
shown in FIG. 9 on the bobbin on which the voice coil (4) is wound. Pressure regulator 0 to
pressure regulator α ◆, discharge conduit a9. Liquid air which is a cooling medium led to the
inlet pipe aO passing through the connecting part is already a low temperature gas, and <Possed
pole piece (1) is cooled and processed into a bobbin through a hole, voice The voice coil, which is
one heat source, is divided into a route flowing in parallel flow in the gap between the coil (4)
and the top plate (3) and a route flowing in the gap between the bobbin and the pole piece (1) It
efficiently cools, rejoins, and is discharged to the outside from the outlet pipe α force provided
on the lower surface of the pole piece. In the example of FIG. 3, it is possible to use a odorless,
non-irritant and harmless substance as the cooling medium and naturally exhaust it to the
outside of the speaker system Ql through mesh mesher (7) instead of exhaust pipe by outlet pipe
αD. good. I took it. Although FIG. 3 and FIG. 4 show an embodiment of the external magnet type
magnetic circuit, the same effect can be obtained by using it in the internal magnetic type
magnetic circuit. Also, needless to say, it is not necessary to set the piping of the cooling medium
passage when the usage is made so as not to reach a high temperature. In addition, to improve
convenience such as transportation, movement. The use of piping that can be attached and
detached by a fun touch method etc. will further improve usability. As described above, according
to the present invention, since the pressure vessel in which the cooling medium is enclosed can
be connected and cooled only when the characteristics are adversely affected by the temperature
rise, the speaker system can be provided. It is possible to provide a speaker system capable of
preventing a decrease in performance due to self-heating without increasing the housing price
and increasing the size of the speaker system. In addition, when transporting or moving, it is
convenient that the speaker system, the pressure vessel, the discharge conduit, and the like can
be divided and handled.
Brief description of the drawings
1 is a general view of the present invention, FIG. 2 is a cross-sectional view of a connection
portion, FIG. 3 is a cross-sectional view of a speaker unit, FIG. 4 is a cross-sectional view of a
speaker unit according to another embodiment, and FIG. Is a cross-sectional view of the speaker
unit of FIG.
In the figure, (1) is a pole piece, (2) is a magnet, (3) is a top plate, (4) is a voice coil, (5) is a
diaphragm, (6) is a cap, (7) is a spider, (8) is a frame, (9) is a voice coil space, aυ is a speaker
unit, αJ is a pressure vessel, and a41 is a pressure flow regulator. (I! Reference numeral 9
denotes a discharge conduit, a · denotes an inlet pipe, 11 denotes an outlet pipe, αα denotes a
connection, and (、) denotes liquid air. In FIG. 9, the same reference numerals denote the same
parts. Figure 1
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