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Another object of the present invention is to prevent the reduction of the driving force even if the
voice coil vibrates with a large amplitude in the speaker. Conventionally, in order to achieve the
above object, as shown in FIG. 1, a long voice coil 3 having a winding width of a dimension
longer than the thickness of the top plate 4 in the magnetic gap was employed. The width of the
effective voice coil is a part of the current to be top-plated away from the top plate (d-force is not
generated, so there is a problem that the efficiency is very low. An embodiment of the present
invention will be described below with reference to the drawings. The same reference numerals
as in FIG. 1 denote the same contents. As shown in FIG. 2, both-side VC ftili control voice coils 8,
9 of the voice coil 3 are provided. Detector] 0 shoulder 1, voice coil bobbin 【A sensor attached
to a voice coil bobbin and outputting a signal proportional to the vibration of the voice coil
bobbin. A sensor that applies a piezoelectric element or a semiconductor element to detect
acceleration. The amplitude may be detected by an element or the like. As the block diagram of
the present invention is shown in FIG. By inputting to the voice coil 3, the output of the sensor IO
and the input signal of the voice coil 3 are fed back to the control voice coil 8 through the input
17 to the differential amplifier 13,. The vibration of the voice bobbin 1 becomes large in
amplitude and moves to the outside of the voice coil 3 cadence 4 and the magnetic flux passing
through the voice coil 3 decreases. When the driving force decreases, the output of the sensor 10
decreases, and the output of the differential amplifier 13 that outputs the difference from the
input signal of the voice coil 3 generates a signal proportional to the decrease in the driving
force. , 9 and at this time, since the control voice '1: 8 or 9 is in the effective magnetic flux of the
top plate, it can be efficiently controlled even if the control current is small enough. Can. Still, by
inserting an optional equalizer, it is possible to set the vibration frequency of the voice coil
arbitrarily. As described above, according to the present invention, it is possible to reduce
distortion of the large-amplitude port j without lowering the efficiency as in the prior art even
with the long voice Koino, and to reduce the distortion of the power amplifier. It is possible to
provide a driver with an arbitrary frequency characteristic, since Yonarufidoba can be used. FIG.
1 is a cross-sectional view of a conventional loudspeaker, FIG. 2 is a cross-sectional view of a
loudspeaker according to the present invention, and FIG. 3 is a block diagram of a loudspeaker
system according to non-probability 1 + q.
] .. mountain .... voice coil bobbin, 2 ...... mountain Tampa, 3 ... river-voice coil, 4 ° 's ° ···· top
plate, 5 ° "magnet, 6 ... ----- back plate, 7 ........ center pole, 8, 9 ...... control JTJ voice = l-yl, 1o ··
song [1+ sensor, N, 14 ··· · · · Power amplifier, 12 · · · · · · · · · · · · · · · · · · · · · · · differential amplifier.
Patent applicant Matsushita Electric Industrial Co., Ltd.-5 type company Figure 1 "Figure 3
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