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JPS5572393

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DESCRIPTION JPS5572393
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of the main part of a
conventional speaker, and FIG. 3 is a half cross-sectional side view of the main part of a speaker
according to an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1 ... Lower fret
2 ... center pole 3, 3 ... magnet 4; .. Upper plate, 6 ... Voice coil, 10 ...: Tubular body, 11 ... Tubular
body, 12: Coil bobbin 0
DETAILED DESCRIPTION OF THE INVENTION The present invention reduces the temperature
rise of the voice coil without reducing the efficiency, and provides a speaker with a large input
resistance. 1 and 2 show the main parts of a conventional speaker in which the heat generated
by the voice coil is dissipated to improve the input resistance. In FIG. 1, 1 is a lower plate, and
this 2), T7 ′ ′-1 ′ ′ ′ ′ 1 center 1nt! ゞ 7 ')-, f- / 2t' <", □ l) are integrally formed. 3 is on
the upper surface of the lower plate 1. y32-1o fixed ring, 7 gnets 4.4). 7) An annular upper plate
fixed to the upper surface of the gunnet 3. A magnetic gap is formed between the inner
peripheral surface of the upper plate 4 and the outer peripheral surface of the center pole 2. A
coil bobbin 6 has a voice coil 6 wound around the coil bobbin 6. The voice coil 6 is disposed in
the magnetic gap. The diaphragm is coupled to the coil bobbin 5 and supported by a damper. A
heat pipe 7 is embedded in the upper plate 4 and the center pole 2 at one end of the heat pipe 7
and located near the magnetic gap. Reference numeral 8 denotes a radiation fin attached to the
other end of the heat pipe 7. In FIG. 1, the heat generated in the voice coil 6 is transmitted to the
upper plate 4 and the center pole 2 through the air in the magnetic gap portion and is further
dissipated through the heat pipe 7 5, however, the above-mentioned conventional speaker In the
case of “N”, 熱 because there is an air layer with poor thermal conductivity between the voice
coil 6 and the upper plate 4 or the center plate “j-3”, heat conduction is poor. There is a
drawback that the cooling effect does not increase. FIG. 2 is a second prior art example for
eliminating the drawbacks of the prior art example shown in FIG. In FIG. 2, reference numeral 9
denotes a coil bobbin in which a thin heat pipe is formed in a cylindrical shape, and a voice coil 6
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1
is wound around the coil bobbin 9 formed of the heat pipe. In the conventional example shown in
FIG. 2, the heat of the voice coil 6 whose temperature has risen by the application of the electric
input is transferred to the coil bobbin 9 consisting of a heat pipe, the heat is transferred to the
upper portion of the coil bobbin 9, Ru. However, in the conventional example shown in FIG. 2,
there is a manufacturing limit in thinning the heat pipe constituting the coil bobbin 9, and the
coil bobbin 9 becomes thick and the size of the magnetic gap must be increased. Has the
disadvantage of reducing the efficiency of
The present invention eliminates the above-mentioned disadvantages of the prior art. An
embodiment of the present invention will be described with reference to FIG. 3 below. In FIG. 3,
the same parts as in FIGS. 1 and 2 are assigned the same reference numerals. In FIG. 3, 10 is a
cylindrical body made of metal foil such as copper or aluminum having good thermal
conductivity, and the voice coil 6 is wound around the outer peripheral surface of this cylindrical
body 1o. Reference numeral 11 denotes a cylindrical body made of a heat pipe, and a cylindrical
body 1o made of the above-mentioned metal foil is fixed to the lower step portion of the
cylindrical body 11 by soldering or the like. As described above, in the present embodiment, the
coil bobbin 12 is constituted by the cylindrical body 10.11, and the cylindrical body 10 made of
metal foil is inserted into the magnetic gap, as compared with the conventional example shown in
FIG. Thus, the size of the magnetic gap can be reduced, and the efficiency of the speaker can be
improved. Further, in the present embodiment, the heat of the voice coil 6 is transmitted to the
cylindrical body 11 made of a heat pipe via the cylindrical body 1o made of metal foil and
dissipated, compared with the conventional example shown in FIG. The heat dissipation effect is
good. In the above embodiment, the cylindrical body 10 is formed of metal foil 6 in shape, but it
is not limited to metal foil, but metal having good thermal conductivity is deposited on at least
the outer peripheral surface. Or the like may be coated or laminated. Also, if a metal diaphragm
or metal damper with good thermal conductivity is attached to the cylindrical body 11 made of a
heat pipe, these metal diaphragm and metal damper work as a radiation fin, and the heat
radiation effect is further improved. It is. Furthermore, the cylindrical body 10.11 in the above
embodiment may be integrally formed. The speaker according to the present invention is
configured as described above, and according to the present invention, it is possible to obtain a
speaker having an excellent heat dissipation effect and a large input resistance without reducing
the efficiency of the speaker.
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