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DESCRIPTION JPS5467621

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DESCRIPTION JPS5467621
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a rear perspective view of a heat dissipating
device in a conventional speaker, and FIG. 2 is a heat dissipating device for a magnetic circuit
according to the present invention. 3 is the same (a partially cut away side view, FIG. 4 is a rear
perspective view showing another embodiment). 5: main body of speaker, 6: magnetic circuit, T:
frame, 9: cone, 10: window, 11: metal pipe, 12: fin.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heat dissipation
device for a magnetic circuit portion in a speaker, and more particularly, to a window of a frame
supporting at least a cone, formed by skiving and coupled to a magnetic circuit portion. It is
known that the continuous maximum allowable input of the speaker is substantially determined
by the heat resistance of the voice coil, in general, in the case where the heat dissipating effect is
positively obtained by exposing the heat dissipating fins. ing. Therefore, if the temperature rise of
the magnetic circuit including the voice coil and the yoke (1) ft / (1/2) is suppressed, an even
larger allowable input can be set. In other words, it is possible to further increase the continuous
maximum allowable input of the conventional speaker having no effective cooling means, and it
is understood that it seems to drive the beaker with surplus. However, for this reason, as shown
in FIG. 1, on the circumferential surface of the magnetic circuit portion (case body) 3 which is
continuous with the frame 2 supporting the cone 1 and which encloses the frame 1 and the yoke,
etc. It has been proposed that an interval ((a narrow rib 4 is integrally provided). However,
although the conventional rib 4 slightly enlarges the entire surface of the foundation air circuit
portion 30 including the rib 4 to achieve the heat radiation effect of the surface portion of the
magnetic circuit portion, the voice coil itself and the yoke (magnetic pole 2.) It is not configured
with the intention of releasing heat all actively. In other words, it utilizes only the cooling effect
of the air temperature itself existing in the space where the speaker is installed, dust, not actively
creating a flow of air and diving in the cooling effect. Therefore, according to the conventional
example of soil (2), there is a limit to the heat radiation from the eye. The present invention has
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been made in view of such conventional problems, and therefore, the object of the present
invention is to use a skive work to form an outer peripheral surface of a metal cylinder (a heat
dissipating member having a large number of fins projecting therefrom). By connecting the
speaker to the magnetic circuit portion of the speaker and arranging the fin to face the window
of the frame supporting the cone, the wind pressure due to the vibration of the cone is used to
make It is an object of the present invention to provide a heat dissipation device of a magnetic
circuit portion in a novel speaker so as to actively carry out a cooling action. Hereinafter,
embodiments of the present invention will be specifically described with reference to the
drawings. FIGS. 2 and 3 are a rear view and a partial side cross-sectional view showing an
embodiment of the heat dissipation device according to the present invention, and a magnetic
circuit which encloses 6 (one speaker or magnetic circuit member (not shown) such as yaw).
Section (case body) 6, a metal frame 7 continuously connected to the magnetic circuit section 6
and having a forwardly expanded f ′, and an opening formed by the retaining ring 8 at the open
end of the metal frame 3. The metal frame 7 is provided with an air intake / exhaust hole 1o at a
suitable position of the metal frame 7 in order to make the movement of the cone 9 smooth.
On the other hand, 11 is a metal pipe formed of a metal member such as aluminum, and on the
outer peripheral surface of this metal pipe 11, a large number of thin fins 12 are cut by skive
work, and the width and length thereof The heat sink is formed sufficiently long to form the heat
dissipating member. Then, as shown in the figure, the magnetic circuit portion 6 (press-fit or
fixed to the metal tube 11 of the speaker) is fixed to the metal tube 11 thus formed. At this time,
the intake and exhaust holes 10 of the t frame 7 are made to face the t 12 fins. Further, as shown
in FIG. 2, these fins 12 are arranged in a row, and a space is provided between the rows and the
rows, so that the air of the cone 9 is exposed to the vibration of the above-mentioned co / 9. The
heat radiation effect of the magnetic circuit portion 6 is enhanced to-(4) stage by the cooling
action of the fins 12 due to the air 7) due to the air 7) without being disturbed at all by the inflow
and outflow. Furthermore, by providing the fins 12 thinly and in large numbers, the heat
exchange area is significantly increased, and the heat radiation is effectively performed. FIG. 4
shows another embodiment of the heat dissipation device according to the present invention, in
which the fins 14 like the blades of a wind turbine are cut parallel to the surface of the metal
tube 13 by skive work. According to this embodiment, the surface area of the magnetic circuit
unit 6 is enlarged, and the fins 14 and the window 1 o of the frame 7 are obstructed to prevent
the air flow generated on the back surface of the cone paper. The air around it does not form a
complex turbulent flow between the above-mentioned fins 14, and cooling of the fins 14 is
further effectively performed to quickly perform heat exchange, and the heat radiation effect of
the magnetic circuit portion 6 Can be further enhanced. According to the present invention as
described in detail above, according to the present invention, a skive machined V-shaped heat
dissipation member in which a large number of fins are cut and raised on the outer peripheral
surface of a metal cylinder is coupled to the magnetic circuit portion of the speaker and the
above-mentioned fins By facing the window provided in the frame (5) □, the heat exchange of
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the magnetic circuit part of the speaker can be efficiently performed, thereby significantly
improving the tolerance of the speaker. it can. In addition, the components implemented for this
purpose are obtained extremely easily and inexpensively, and the assembly is extremely easy in
work, and thus is extremely useful for practical use.
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