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JPS5660393

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DESCRIPTION JPS5660393
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a general speaker,
FIG. 2 is a cross-sectional view of a main part of a conventional speaker, and FIG. 3 is a main part
showing an embodiment of the speaker of the present invention. FIG. 1 · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · Center pole, 2, 3 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · magnetic gap, 8 · ·
· · Magnetic circuit · · · · · · · · · · · · · · · · · · · · print voice coil, 10 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
·············
The present invention relates to a speaker using a vibrating membrane on which a voice coil is
printed, which efficiently dissipates heat generated by the voice coil and improves input
resistance. It is something to try. Generally, this type of speaker is configured as shown in FIG.
That is, the 11 + VC magnets 2 and 3 of the plate-shaped center pole 1 are rearranged, and the
inverted yokes 4 and 6 are arranged on the outer surfaces of the magnets 2 and 3-. A magnetic
circuit 8 is formed between the yoke 4 and 5 and the center pole 1 to form a magnetic cap 6.7,
and an aluminum foil is attached to the lower surface of the magnetic circuit 8 by etching. In the
vibrating membrane 10 with the polyimide Hiko formed the printed voice coil 9 in the shape of a
circle! The print voice coil 9 is made to correspond to the magnetic gap 6.7, the fixing ring 11 is
attached on the periphery of the vibrating membrane 1o, and the sound absorbing material 12
such as glass fiber is disposed on the vibrating membrane 1o. The net 13 was previously
disposed on the sound absorbing member 12 and the fixing ring 11, and the front net 13 is fixed
by the baffle plate 14 coupled to the magnetic circuit 8. This speaker can reproduce to the very
high frequency, and has a feature which is not found in other types of speakers, such as very
high input response. However, since this speaker has a very small cross-sectional area of the
print voice coil 9, the aluminum foil -1 'is large, and the speaker is likely to generate heat by
application of an input. In addition, since there is no metal material such as the good heat
conductive yokes 4 and 6 near the print voice coil 9, the heat radiation is very bad. This means
that the rate of increase of the resistance value of the print voice coil 9 is high, and it has a
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disadvantage that the input resistance and the dynamic range are bad. Conventionally, as shown
in FIG. 2, glass fiber is used as the sound absorbing material 12, and any measures against heat
radiation are taken, and it has the above-mentioned problems. The present invention eliminates
the above-mentioned conventional drawbacks. Hereinafter, an embodiment of the present
invention will be described with reference to FIG. The overall structure is the same as in FIG. 1,
and only the features of the present invention will be described here. That is, in the present
invention, the sound absorbing material 12 is in close contact with the vibrating film 10 using a
crow fiber in which aluminum is vapor deposited. · By this sound absorbing material 12, the heat
generated in the print voice cary 4-1 is dissipated to the outside through the sound absorbing
material 12 made of glass fiber on which the aluminum is deposited, and the temperature rise of
the print voice coil 9 is suppressed. Also, the same as the input resistance can be measured, and
the dynamic range can be enlarged.
The thermal conductivity can be sufficiently improved with a thickness of a few hundred
angstroms of aluminum, and it is easy to deposit on glass fiber, and it can be obtained in one
curve. Furthermore, in the deposition of aluminum of about several hundred angstroms, the
increase in mass as the sound absorbing material 12 is also small, and the decrease of the sound
pressure level is hardly observed. The heat dissipation of the voice coil is significantly improved,
so that the input resistance can be improved, the cost is not increased, the efficiency is hardly
reduced, and the practical value is increased.
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