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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing an embodiment
of a speaker according to the present invention, and FIG. 2 is an enlarged cross-sectional view of
the relevant part. 1 ...... magnetic circuit, 2 ...... center pole, 3 ° 4 ...... York, 5 and 6 ...... magnet, 7,
8 ..... · Magnetic gap, 9 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · vibrating film, 14 · · · · · · · ·
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a speaker having
a vibrating membrane provided with a print voice coil, and in particular, heat resistance and heat
dissipation using graphitized fibers and carbon fibers as a sound absorbing material. 7 to provide
excellent sound absorption effect /, there is L Di 02. Heretofore, in dome tweeters and ribbon
writers, a sound absorbing material of glass wool or cotton fiber has been used in proximity to
the moving plate. Further, also in a speaker configured by incorporating a vibrating film provided
with a print whistle coil in a magnetic circuit, glass wool or cotton fiber is used as a sound
absorbing material. The above-mentioned cotton fiber is excellent in sound absorption effect but
poor in heat resistance, and there is a possibility that it may be burnt out by heat generation of
the voice coil, glass wool is excellent in heat resistance but acts as a heat insulator and vibrates
with a print voice coil. There is a drawback in that the heat dissipating property of the film is
impeded, and the copying film made of the hollyimidamide resin is thermally destroyed. The
present invention eliminates the above-mentioned conventional drawbacks. An embodiment of
the present invention will be described below with reference to FIGS. 1 and 2. FIG. A magnetic
circuit 1 holds a magnet 6.6 between a plate-like three center pole 2 and a yoke 3.4, and projects
the center pole 2 and the yoke projected on the upper part of a Macnet '5.6. It is configured to
form a uniform gap 7.8 between 3 and 4. A polyimide having a print voice coil 9 made of spiral
aluminum or the like formed on the lower surface of the air circuit 1 having such a configuration
by printing or the like. A vibrating membrane 1o composed of an amide resin film or the like is
disposed, a fixing ring 11 is disposed on the peripheral portion of the vibrating membrane 10,
and a front net 12 is disposed on the same member 1 The ff1 lJ tongue 11 is pressed by the
baffle plate 13 coupled to the upper surface of the yoke 3.4. In the space between the vibrating
membrane 10 and the front net 12, a sound absorbing material 14 made of graphitized fiber or
carbon fiber is disposed. The graphitized fibers and carbon fibers of this sound absorbing
material 14 have a diameter of 10 μm or less and a light weight with a density of 1.6 to 1.9 and
little weight addition to the vibrating membrane 10 to reduce the sound pressure output level. -There is nothing to be concerned about. Next, the thermal conductivity and density of aluminum
fibers, glass wool, and graphitized fibers used in the present invention are shown in the following
table. Thermal conductivity density □ (K (J / IQ, hr, 'C) (g / c)) aluminum fiber 180-1902.7 glass
wool 6-72.7-2 ° graphitized fiber 106-1151.6-1. Further, when the input resistance of a speaker
using glass wool as a sound absorbing material and a speaker according to the present invention
is compared, those of 46 to esoW in the related art have been significantly improved to 60 to 70
W according to the present invention.
The thermal conductivity can be further improved by vapor-depositing a metal of good thermal
conductivity such as aluminum on the graphitized fiber or carbon fiber. As described above, since
the speaker of the present invention is configured, the heat of the printed voice coil can be
dissipated efficiently, the heat resistance is excellent, and the adsorptivity can maintain sufficient
effects over a long period, and the reliability and reliability can be maintained. It can be made to
be rich in stability 5 and has a great practical value, such as a significant improvement in human
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description, jps56116800
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