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[Industrial field of application] The present invention relates to a forced cooling means for a
speaker unit. [Prior Art] FIG. 2 is a cross-sectional view showing a conventional speaker unit, in
which (1) is a pole bead, (2) is a magnet adhered on the pole plate pace plate, and (3) is the above
The top plate bonded on the magnet (2) to form a magnetic gap with the pole bead (1), the closed
magnetic path is formed by the pole bead (1), the magnet (2) and the top plate (3) It is
configured. (4a) is a diaphragm. (4b) is a bobbin which is inserted into the magnetic gap and
cooperates with the diaphragm, and a voice coil (4c) is wound thereon. (4d) is a support member
for the diaphragm (4a). Further, (5) is an equalizer provided between the ball bead (1) and the
diaphragm (4a) to improve frequency characteristics, and (6) is provided on the side opposite to
the equalizer of the pole piece (1). A horn for improving performance such as efficiency, and (7)
are back force bars for keeping a predetermined space outside the diaphragm (4a). The operation
is explained next. That is, when an input signal is applied to the voice coil (4c), the voice coil (4c)
receives a force corresponding to the input signal, and radiates a sound from the diaphragm (4a)
through the bobbin (4b). By the way, it is necessary to suppress the temperature rise of the voice
coil (4c) to a low level to improve the input resistance and the reliability in the speaker unit that
produces a loud sound, and in the conventional speaker unit, it occurs in the voice coil (4c) The
heat generated is released mainly by two heat radiation paths, one of which flows from the
diaphragm (4a) to the atmosphere through the bobbin (4b) and the other to the pole bead (1)
through the air in the magnetic gap. It is a path that flows to the top plate (3) and flows from the
surface of the magnetic circuit unit to the atmosphere. [Problems to be Solved by the Invention]
Since the conventional speaker unit is configured as described above and the forced heat
dissipation means is not adopted, the heat dissipation function is not sufficient and as a result,
the temperature rise of the voice coil becomes large. There were problems such as the
continuous use in and the inability to expand the allowable input. The present invention has been
made to solve the above problems, and has an object of forcibly removing the heat generated
from the voice coil and suppressing the temperature rise to a low level. [Means for Solving the
Problems] In the speaker unit according to the present invention, a hollow pipe through which a
cooling fluid passes is coiled, for example, in a member that forms a heat radiation passage from
the voice coil (4c). .
[Operation] In the present invention, the heat generated in the voice coil is removed by the
cooling fluid passing through the hollow pipe wound around the member forming the heat
radiation passage. [Embodiment] An embodiment of the present invention will be described
below. That is, in FIG. 1, the same parts as those in the conventional one are given the same
reference numerals and the duplicate explanation thereof will be omitted, but (10) in the figure is
a magnetic circuit forming a heat radiation passage from the voice coil (4c) A hollow pipe coiled
around the outer periphery of each member of the unit, through which a gas such as nitrogen or
helium or a cooling fluid such as liquefied nitrogen, mercury or water is circulated in the hollow
pipe (10). ing. The material of the hollow pipe is preferably metal or thin-walled resin. In
particular, nonmagnetic metal such as copper and aluminum is preferably used, and this can also
reduce green and magnetic distortion. Next, the operation of the present invention will be
described. That is, the input current flows to the voice coil (4c) and this is driven. Then, the
temperature of the voice coil (4c) rises, and the heat generated here is transmitted to the magnet
(2). A voice coil is absorbed by the cooling fluid passing through the hollow vibrator (10) coiled
around the outer periphery of the heat radiation passage forming member such as the top plate
(3), the pole piece (1) and the back force bar (7) The temperature rise of (4c) will be suppressed.
Although the rear type using the sound of the back surface of the diaphragm (4a) is described in
the above embodiment, it may be a front type using the sound from the front surface of the
diaphragm (4a). Also, the winding of the forced cooling hollow pipe is not wound around the
entire magnetic circuit unit as shown, but the top plate (3). It may be wound around at least one
of the pole piece (1), the magnet (2) and the back force bar (7). In the other embodiments, the
speaker unit of the external magnet type has been described, but it may be of the internal
magnet type. [Effect of the Invention] Since the speaker unit of the present invention is
configured as described above, the input resistance of the speaker unit is greatly improved, and
there is an effect that a high-reliability high-output sbeaker can be obtained.
Brief description of the drawings
FIG. 1 is a vertical sectional view of a speaker unit according to the present invention, and FIG. 2
is a vertical sectional view of a conventional speaker unit.
In the figure, (4c) is a voice coil and (10) is a hollow pipe. In the other figures, the same symbols
indicate the same parts.