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JPS5529895

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DESCRIPTION JPS5529895
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross sectional view showing a conventional
headphone, FIG. 2 is a frequency characteristic diagram for sound of the same headphone, FIG. 3
is a cross sectional view showing one embodiment of the headphone of the present invention,
FIG. 4 is a sound pressure frequency characteristic diagram of the present invention and a
conventional headphone. 14 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · woofer unit, 20 · · ·
magnetic circuit, 22 · · · · magnetic cap, 23 · · · voice coil, 24 · · · · 26 ...... case, 27 ...... hole, 28 ......
front baffle, 29 ...... ear pad, 31 ...... bimorph vibrator.
DETAILED DESCRIPTION OF THE INVENTION The present invention is intended to provide a
wide-b headphone having a reproduction band, in which a bimorph vibrator for soir is
incorporated coaxially with a woofer unit near an ear pad. As headphones in the prior art, as
shown in FIG. 1, a plate 3 having a center pole 2 in which a through hole 1 is formed at the
center, a ring 3 Macnet 4 and a ring upper plate 51'i: Magnetic circuit 6 and C 'frame 7 coupledthis diaphragm 7 incorporates a diaphragm 81, and a voice coil 9 coupled to the diaphragm 8 is
fitted into the magnetic gap 1o of the magnetic circuit 6 A magnetic circuit 6III is covered with a
case 11 having several through holes, a diaphragm front face 12 is covered with a diaphragm
front face 12, and an ear pad 13 is attached to the front baffle 12. FIG. 2 is an example of the
sound pressure frequency characteristic of this conventional headphone. If the ear band 13 has a
sealed structure, the stiffness of the space surrounded by the auricle, the ear canal, the ear pad
13, and the diaphragm 8 of the driver unit is effective when wearing the '3. Thus, as shown in
FIG. 2, the frequency band above the resonance point fH can not be reproduced practically, and
the high frequency reproduction is insufficient. For this reason, in the past, a multi-way lighter
has been developed by separately providing a lighter to compensate for the high frequency
range. As shown by the broken line in the figure, the sound pressure frequency characteristics
are not sharp enough to produce a sharp tone at the resonance point fR of the lighter and can
not be reproduced flat to the high range, and it can not be said that the reproduction band is
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broadened. . The present invention eliminates the above-mentioned conventional drawbacks.
Hereinafter, an embodiment of the present invention will be described with reference to FIG. 14
is a U-ha-uninotte, and the Konoha unit 14 is constituted by a plate 17 having a center pole 16
having a through-hole 15 at the center, a ring 17 4 and a ring-shaped upper plate 19 as well. A
frame 21 is coupled to the magnetic circuit 2o, and a diaphragm 24 having a voice coil 23 fitted
therein is incorporated in the magnetic gap 22 of the magnetic circuit 2o of the frame 21iC. On
the magnetic circuit 20 side of the woofer unit 14, a case 26 having a cap shape and having a
large number of through holes 25 formed on the back is covered, and a diaphragm 241i] 11 has
a cap shape and a front baffle having a large through hole 27 in the center. 28 is covered.
An i-i ear pad 29 is attached around the front of the front baffle 28. Further, in the through hole
27 of the front pan 28 a disc-like bimorph oscillator 31 acting as a partially held soiator via an
elastic holder 30 is attached. Since the bimorph oscillator 31 is partially held by the elastic
holder 3 o and only the bimorph oscillator 31 is held, the sound of the two haunotot 14 is
radiated to the ear pad 29 side by this gap. 5 With such a configuration, the acoustic capacity Ca
of the space formed by the diaphragm 24 of the woofer unit 14, the front baffle 28, and the
bimorph oscillator 31, and the IA having the earhat 29 are the through holes 27 of the front
baffle 28 and the bimorph oscillator 31. The co-imaging frequency of the acoustic resonator
composed of the acoustic mass Ma formed by the gap between the two and the モ ル 1/6 in the
vicinity of the sharp peak of the sound pressure frequency characteristic by the co-imaging of the
bimorph oscillator 31 By placing it in an octave, the bimorph oscillator 31 such as Q-5, for
example, has a flat peak of v4 octave width as shown by the solid line in FIG. Result in widening
the playback bandwidth. As described above, by incorporating the bimorph oscillator, the sound
source of the present invention can be made to have a sound pressure frequency characteristic
up to the resonance point fR of the bimorph oscillator and substantially expand the reproduction
band substantially It is possible to adjust the sound quality and adjustment that is effective both
in terms of characteristics and in terms of hearing, and it is a dog of practical value,) 6) 0
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