JPS61111092

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DESCRIPTION JPS61111092
[0001]
FIELD OF THE INVENTION The present invention relates to a loudspeaker system for use in
electroacoustic devices. (Conventional Configuration and Problems Thereof) A conventional
speaker system will be described with reference to FIGS. 1 and 2. FIG. In FIG. 1, a conventional
speaker system is one in which a plurality of speakers 2 and 3 are connected in series or in
parallel to one cabinet 1, and an example in which two speakers are connected in series is shown
in one drawing. A speaker system having such a configuration is used particularly for bass
reproduction, and the amplitude per speaker is reduced, thereby reducing harmonic distortion
and intermodulation distortion in a low frequency band, and sound pressure. There was an effect
that the level improved. However, in such a configuration, there is a problem that
intermodulation distortion in the middle and high frequency bands due to the relative
displacement of the field path and the poise coil which constitute the speaker can not be reduced.
This will be described with reference to FIG. FIG. 2 shows the change of the poise coil impedance
caused by the change of the relative position of the magnetic gap 5 of the field path 4
constituting the speaker and the poise coil 6 inserted in the same. 2 (A) shows the neutral
position of the poise coil 6 when the speaker is not operating, and FIGS. 2 (B) and 2 (C) show the
positions of the movable upper end and the movable lower end of the poise coil 6 when the
speaker is operating. It is shown. Fig. 2 (D) is a characteristic curve with the horizontal axis
representing the input frequency to the poise coil and the vertical axis representing the poise coil
impedance, and the solid line A shows the characteristics of the neutral position of the speaker.
When 6 is pulled out of the magnetic gap 5, the impedance of the poise coil drops in the middle
and high frequency band, and becomes the alternate long and short dashed line B. And the
broken line C is shown, because the relative positional relationship between the magnetic flux
produced by the poise coil 6 and the plate 7 made of a magnetic material that constitutes a part
of the field path 4 changes. The difference in the medium and high frequency band of the poise
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coil impedance is the cause of intermodulation distortion in the medium and high frequency
band. (Object of the Invention) The present invention solves the above-mentioned drawbacks, and
the relative merits of the reduction of the harmonic distortion due to the reduction of the
amplitude, the reduction of the intermodulation distortion and the improvement of the sound
pressure level are maintained. It is an object of the present invention to provide a speaker system
capable of reducing intermodulation caused by dynamic displacement.
(Structure of the Invention) In a speaker system in which even number of electrodynamic type
loudspeakers of the same characteristic are connected in series and mounted in a cabinet, a
diaphragm drive unit consisting of a field path and a poise coil is used. The other half of the
speakers are arranged on the front side of the sound wave emission direction, and the other half
of the speakers are arranged on the rear side of the sound wave emission direction of the
diaphragm. When it shifts, the half-peaker's poise coil impedance is increased in the higher band
than the middle frequency band, and the other half is decreased. It is intended to reduce
intermodulation distortion by offsetting the opposite changes in the Poisecoil impedance of these
two types of speakers. DESCRIPTION OF THE PREFERRED EMBODIMENT The preferred
embodiment of the present invention will be described with reference to FIGS. FIGS. 3 and 4
show a speaker having two identical characteristics used in the speaker system according to the
present invention, wherein the speaker comprises the diaphragm 9 held by the frame 8, the field
path 4 and the poise coil 6. And the damper 10 for supporting the poise coil 6, the abovementioned diaphragm drive part is on the rear surface of the diaphragm 9 in the sound wave
radiation direction in FIG. 3 and in FIG. They are respectively disposed on the front side in the
radial direction. FIG. 5 shows the speaker 11 shown in FIG. 3 in which the diaphragm drive unit
is disposed on the rear surface of the diaphragm 9 in one cabinet 1 and the fourth in which the
diaphragm drive unit is disposed on the front surface of the diaphragm 9 The speaker system
shown in the figure is a speaker system in which these are connected in series and driven in
phase. In this way, when the loudspeakers operate, two loudspeakers exhibiting opposite changes
in the poise coil impedance are driven in phase to offset this and provide a loudspeaker system
with low intermodulation distortion over the entire frequency band. It is. As described above,
according to the present invention, by using an even number of speakers connected in series. In
the low frequency band, in addition to the effects of reduction of harmonic distortion and
intermodulation distortion due to the reduction of amplitude and improvement of sound pressure
output, reduction of intermodulation distortion of middle and high frequency bands due to the
offsetting effect of the poise coil impedance change An effect is obtained, and a highperformance speaker system with low intermodulation distortion in all frequency bands can be
obtained.
[0002]
Brief description of the drawings
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[0003]
FIG. 1 is a cross-sectional view of a conventional speaker system.
Fig. 2 is a diagram showing the relative positions of the field path and the poise coil, and the
poise coil-impedance-frequency characteristic curve at this time, and cross-sectional views in
which (A), (B) and (C) show the relative positions. (D) is a characteristic curve diagram, FIG. 3 and
FIG. 4 are cross-sectional views of the speaker used in the speaker system of the present
invention, and FIG. 5 is a cross-sectional view of the speaker system according to the present
invention. DESCRIPTION OF SYMBOLS 1 ... Cabinet, 2, 3, 11, 12, ... Speaker, 4 ... Field path, 5 ...
Magnetic gap, 6 ... Poise coil, 7 ... Plate. 8 · · · Frame, 9 · · · Diaphragm, 10 · · · Damper. Patent
Applicant Matsushita Electric Industrial Co., Ltd. Figure 1 Figure 2
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