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JPS55159691

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DESCRIPTION JPS55159691
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing a conventional
electrodynamic speaker. FIGS. 2, 3 and 4 are sectional views showing an embodiment of an
electrodynamic speaker based on the present invention. 01 ииииииииииииииииииииииииииииииииииииииииииииииииии 3. иииииии
Magnet, 4 и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и
и и и и и и и и и иииииии Voice coil, 9 ииииииии Coil bobbin, 10, 11
иииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии
ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии Through 12 и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и
и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и heat dissipation plate
18,.................. Sound absorbing material.
DETAILED DESCRIPTION OF THE INVENTION This invention relates to an improved
electrokinetic speaker which circulates a heat transfer fluid to reduce the temperature rise of
voice coils, magnetic circuits and the like. As a conventional electrodynamic speaker of this type,
there is a structure as shown in FIG. That is, in FIG. 1, the magnet 3 is adhered to the upper
surface of the yoke 2 integrally formed with a 7'-point pole 1'f, and the other yoke 4 is adhered
to the upper surface of the magnet to form a magnetic circuit. An annular gap is formed by the
inner peripheral surface of the yoke 4 and the outer periphery of the center pole l. Then, a single
coil bobbin 9 on which the voice coil 8 is wound is attached to the diaphragm 7 to which the
vibrator holder 5 has the ENO 6 fixed. The voice coil J coil 8 and the coil bobbin 79 are It is
disposed in the annular space. Further, to the through holes 10 ░ 11 provided in the yoke 2,...
14.15 connected to the hoses 13 for circulating the heat transfer fluid 12 are connected. The
magnetic gap is filled with a magnetic fluid 16 for sealing the heat transfer fluid 12. Then, the
heat generated by the voice coil 8 is transferred to the yoke 4 through the magnetic fluid 16 and
through an 11-boll bobbin whose end is extended to be in contact with the heat transfer fluid 12.
The heat transfer fluid 12 is transmitted. In this manner, the heat generated by the coil 8 is
dissipated to the outside from the heat sink 17 attached to the ceiling 14 ░ 15 or the pipe 715.
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There is. However, in such a structure, it is difficult for the reflux of the heat transfer fluid 12
generated by the tens 7 '13 to generate a sufficient force flow to the thin layer of the heat
transfer fluid in contact with the surface of the 1 l bobbin It becomes. Therefore, the thin layer
prevents the externally cooled heat transfer fluid from coming into direct contact with the 1-l
bobbin, so that the thermal conductivity at the interface between the heat bobbin 9 and the heat
transfer fluid 12 is lowered, thus Even if the motor 13 is operated, the effect of reducing the
temperature rise of the voice coil 8 is relatively small. An object of the present invention is to
provide an electrodynamic speaker in which the above-mentioned problems are solved by
circulating the heat transfer fluid from the through holes provided in the center juice. The
implementation of the invention will be described based on the drawings. In the drawings, those
having the same functions as the elements in FIG. 1 are assigned the same numbers. In FIG. 2, the
center ball 1 is provided with four parts 18, and the recess 18 is connected to the outlet of the
hop 13 by the pair 15.
A plurality of heat transfer fluid outflow holes 19. 19 connected to the recess 18 are provided in
the radial direction of the center all so as to be close to the inner peripheral surface of the coil
bobbin 9. When the R tongue 13 is operated, the heat transfer fluid previously cooled by the heat
sink 17 etc. is drawn out from the plurality of heat transfer fluid outlet holes 19 ░ 19 and
directly hits the inner peripheral surface of the coil bobbin 9. The heat transmitted to the coil
bobbin 9 is taken away. Since the distance between the outer surface of mata and center 1000rook and the outer peripheral surface of tcoil hohino 9 is as small as 0, 1 to 0.4 cranes, the heat
transfer fluid travels through this gap at a high flow velocity, so that ? A large amount of heat
can be taken away, and the cooling effect is improved. The heat transfer fluid outflow hole 1 in
this center hole l! The plurality of heat transfer fluid outlet holes 19.19 are symmetrically
provided 4- to prevent eccentricity of the single bobbin 9 due to the dynamic pressure of the
heat transfer fluid flowing out from l + 19. There is. Generally, aluminum having a large thermal
conductivity is used as the heat bobbin 9, and water, silicone oil or the like is used as the heat
transfer fluid. When water is used as the heat transfer fluid, the surface of the coil bobbin is
subjected to alumite treatment or resin coat treatment, and the inner surface of the center hole
magnet 3, the yoke 2.4, etc. constituting the magnetic circuit. Although it is necessary to carry
out an anticorrosion treatment and to put an anticorrosion agent in water which is a heat
transfer fluid, water is most excellent because it has a high heat transfer efficiency. FIG. 3 is a
view showing another embodiment of the present invention, in which a projection 20 is formed
on the front surface of the yoke 4 to partially shorten the magnetic gap length, whereby the
magnetic flux density is reduced. By raising the height, the magnetic fluid 16 is strongly attracted
to only this portion. As a result, the sealing effect of the heat transfer fluid by the magnetic fluid
16 is improved, so that it becomes possible to use an alcohol having a high heat conductivity and
an antirust effect as the heat transfer fluid, and Since it becomes possible to provide the exit hole
19.19 in the portion where the voice coil 8 of the magnetic gap portion is disposed, the inner
surface of the bobbin in the portion where the voice coil 8 is wound is directly cooled with the
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heat transfer fluid. It is possible to further reduce the temperature rise of the voice coil. FIG. 4
shows another embodiment of the present invention, in which the heat transfer fluid 12 is
symmetrically discharged from the outflow holes 19.19 so that the coil bobbin 9 is always
equally spaced with respect to the outer peripheral surface of the center hole. Utilizing what can
be held in
That is, since the coil bobbin 9 is always held at the center of the center ball 1 by the fluid
pressure, the diaphragm 7 directly connected thereto is also held at the center shaft center, as
shown in FIG. 1, FIG. 2, FIG. The diaphragm edge 6 provided in FIG. Then, since the back space
21 of the vibration & 7 is sealed by the magnetic fluid 16, the back space 21 acts as an air spring
with respect to the movement of the diaphragm 7 in the amplitude direction. Since it is not
necessary to support the diaphragm 7 by 1-no) 6 by these two bulgings, the generation of
distortion due to non-linearity of the support 6 such as a rod or the like is eliminated and
generation of large amplitude is generated. Since the human resistance is improved, it is possible
to obtain the maximum output sound pressure of the dog with a small diameter diaphragm. As
described above, in the present invention, since the heat transfer fluid is made to flow out from
the radial direction of the center pole as described above, the heat transfer fluid from the pump
13 effectively functions to cool the voice coil as compared with the conventional one. Do. That is,
Table 1 shows the test results under the condition that an ester-based solvent is used as the
magnetic fluid, water is used as the heat transfer fluid, and a continuous sine wave power of 20
w can be generated as the excitation signal. . Table 1-----2! Conventional Example 1 In the
embodiment of the present invention shown in FIG. 2, the pump is operated when the pump is
not operating at 60 ░ C. 160 ░ C., and when the temperature is 7 ░ C. and 146 ░ C., as
apparent from this table. The temperature rise reduction effect based on the circulation of the
heat transfer fluid by Honoph in the type 7--и speaker is only 3 ░ C, while the electrodynamic
speaker of this invention is 14 ░ C, and the voice coil is sufficiently It turns out that it is being
cooled. Furthermore, since the heat transfer fluid flows out from the radial direction of the center
pole, the dynamic pressure of the heat transfer fluid always holds the central axis of the coil
bobbin, so that the diaphragm is excited with a large amplitude. There is no contact with the
outer peripheral surface of the center hole. Therefore, since it is possible to reduce the clearance
of the magnetic gap length to about 3/4 as compared with the conventional one, there is an
effect that the gap magnetic flux density becomes high and the efficiency of the speaker can be
equalized. .
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