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JPS5586288

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DESCRIPTION JPS5586288
Description 1, title of the invention
Electro-acoustic transducer
3. Detailed Description of the Invention The present invention relates to a visceral-acoustic
transducer such as a speaker, a microphone, etc., and it is an object of the present invention to be
able to measure improvement in input resistance. As a prior art example, FIG. 1 shows a cone
type dynamic beaker. In the speaker shown in FIG. 1, a gnet (2) is fixed to a yoke (1a) of a center
pole ill consisting of a magnetic and a magnetic body, and a ring-shaped plate (3) made of
magnetic material is attached to this magnet (2). The inner peripheral surface is fixed so as to
have a pair of magnetic gaps with the outer peripheral surface of the center pole t1>. The voice
coil (4) is wound around the voice coil bobbin (5) so as not to contact any of the center ports v
(1) and the plate (3) and located in the magnetic gap. A diaphragm (6) is attached to one end of
the voice coil bobbin (5) 9, and the diaphragm (6), the voice coil bobbin (5) and the voice coil (4)
are driven integrally. ? The integrally driven members are collectively referred to as a vibration
system. The vibration system is a frame (9) fixed to the plate (31 by screws (2)), a damper (7)
made of a visco-elastic body, and the center pole +1) of an edge (8). It is movably supported in
the direction of the central axis. As apparent from FIG. 1, the voice coil (4) is encased in air of
poor thermal conductivity. Therefore, when a large current flows in the voice coil (4), the voice
coil iV + 41 generates heat, and the large current for a long time is overheated, and the voice coil
bobbin (5) and the voice coil (4) are deformed to a plate (2) Lead to contact. Also, due to
excessive ripening, adhesion deterioration of the voice coil (4) progresses, and there is a fear that
the voice coil (4) and the voice coil bobbin (5) may be separated. This drawback occurs not only
in the above-mentioned cone type dynamic beaker but also in the case of a dome type speaker
and a dynamic microphone. The present invention has been made to address such problems, and
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it is an object of the present invention to provide an electro-acoustic transducer which cools a
voice coil and can improve input resistance. Hereinafter, the present invention will be described
based on the drawings showing embodiments by taking a cone type dynamic beaker as an
example. The same reference numerals as in FIG. 1 denote the same members in the drawing,
and the detailed description thereof will be omitted. First, description will be made based on FIG.
2 showing the first embodiment. In the figure, +11) is located at the lengthwise middle of the
voice coil bobbin (5) and the inner peripheral edge is fixed to the tip of the center pole (1) by a
screw 021 and the outer peripheral edge is the voice coil 2 rebob (5). An annular yoke member
in which the space between the voice coil bobbin (6) and the inner surface is sealed with a
magnetic fluid ? (d), (+4 is located at the center boa L / (11 lengthwise middle portion) The
peripheral edge is fixed to the outer surface of the center pole +1) by soldering etc., and the outer
peripheral edge is close to one end inner surface of the voice coil bobbin (5) and sealed between
the voice coil bobbin (5) An annular yoke member ? of which the inner peripheral portion is
close to the outer surface in the lengthwise middle portion of the voice coil bobbin (6) and faces
the yoke member (+1) to be magnetic between the voice coil bobbin (5) Sea in the liquid alpha
thirst Is, the outer peripheral edge plate (3) - a yoke member which is stopped by a screw 021 to
the side, all!
The inner peripheral edge portion of the voice coil V bobbin (5) is sealed with the magnetic liquid
? 9 with the inner peripheral edge portion close to the inner surface of one end of the voice coil
bobbin (6) and facing the yoke member ? ship. 3) A yoke member secured to the other side by a
screw ?2. These respective yoke members (+1! (14) The UNI? phrase is entirely made of a
magnetic material, and this yoke member (11) Q4) 00?i The inside and outside formed by the
center ball (1), the voice coil bobbin (5) and the plate (3) The cooling fluid ?8) is filled in the two
spaces (17a) (17'b) and then h. The voice coil V (4) wound around the voice coil bobbin (5) is
located in the outer space (171) without contacting the yoke member (+5) ?Q. Further, as the
magnetic liquid bath, one not mixed with the cooling fluid ? is used, for example, one in which
iron powder is dispersed in oil is used, and the magnetic liquid facing through the voice coil
bobbin [5) )) The two members can suction each other to seal the voice coil bobbin (6) in a
movable state. The other structure is the same as that shown in FIG. Therefore, as described
above, the cooling fluid ? ? is sealed regardless of the movement of the voice coil bobbin (5) by
forming the magnetic liquid ? (d). Therefore, the voice coil (4) can be driven in the fluid ?
??? in the enclosed space (171L) (17111), the large EndPage: the fluid when the heat is
generated by 2 human power Be done. Also, the fluid ?8) itself generates convection, and the
cooling effect is sustained. A second embodiment will now be described with reference to FIG. In
this embodiment, in addition to the first embodiment, the center ball (1) and the plate (3) in the
space (17a) (17b) are respectively provided with a plurality of holes (l rect (The air flow is
convected through the holes ? 91 + 12 [ll, and the cooling effect is further improved as
compared with the first embodiment. Further, description will be given based on FIG. 4 showing a
sixth ? embodiment. In this embodiment, in addition to the first embodiment ?j, in the space
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(17a, 171), a plurality of debris 7) (in the outer periphery of the center ball 1 and the inner
periphery of the plate 3) 21)! d is provided so that the fluid .alpha..zeta. is convected through this
slit f21) +22, and the cooling effect is improved as compared with the first embodiment. The
present invention can be practiced as described above, the heat generated by the voice coil is
cooled by the filled fluid, but the effect is continued by the convection of the fluid itself.
In addition, the resonance of the voice coil bobbin can be damped by making the cooling fluid
have viscoelasticity. Therefore, according to the present invention, input resistance can be
improved, and a highly efficient electro-acoustic transducer can be provided.
4. Brief Description of the Drawings FIG. 1 is a cross-sectional view showing a conventional
example, and FIGS. 2 to 4 are cross-sectional views showing a different embodiment of the
present invention. Fil: Center ball, (1a): Yoke, +21: Magnet, (3): Plate, (4): voice coil, (5): voice coil
bobbin, (6) ... [I plate, (91 ... frame, (11) ... yoke member, ? ? ... bis, ? wave ... magnetic liquid,
?a (I5) ?e ... yoke member, ( 17a) (17111) иии Space, d, и и и Cooling fluid, ?B'r (gQ и и и hole, ?
(company) и и и Slit agent Yoshihiro Morimoto 1st Fig.-2nd 3rd Figure; ? 4 ░: EndPage: ?
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