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JPS54134027

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DESCRIPTION JPS54134027
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view showing a conventional
speaker system, and FIG. 2 is a sectional view showing a speaker system according to the present
invention. 1.2 · · · · · · · · Speaker, 3, 4, · · · · · · · · · · · · · · · · · · · · · · · · · · magnetic circuit, 8, 9 · · · · · · ·
voice coil.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a loudspeaker
system having a plurality of electrodynamic loudspeakers designed to reduce harmonic
distortion, particularly second harmonic distortion as much as possible. As is well known, in a
general-purpose electrodynamic speaker, harmonic distortion is generated, but one of the causes
is current distortion in a magnetic circuit. Is this due to electric human power (1) 佼-〆? T) The
voice coil moves in the double magnetic gap, and as a result of the current flowing through the
voice coil being distorted by the magnetic non-linearity near the coil, the radiated sound is also
distorted to generate harmonic distortion. However, conventionally, in a speaker system using a
plurality of general-purpose electrodynamic speakers, as shown in FIG. 1, all the speakers (two in
the figure) A and B face the opening of the diaphragm in the same direction. The voice coils of
both speakers A1B are connected in series, in a lotus row, or in series and parallel so that the
diaphragms of the two speakers A and B can vibrate in the same direction along with the
attachment to the cabinet C. , Harmonic distortion of two speakers A, H! There is a disadvantage
that second harmonic distortion is synergistically increased. The object of the present invention
is to solve the above-mentioned drawbacks. That is, Kjl is attached to an even number of
loudspeakers having the same structure as the magnetic circuit and the voice coil so that the
opening direction of all diaphragms is turned, and the even number of loudspeakers are divided
into two. The magnetic circuit of the spill force and the voice coil are arranged in the opposite
direction to each other (2), and each voice coil is connected so that all the diaphragms can
vibrate in the same direction. The purpose is to cancel out current distortion or magnetostriction
generated in relation to a voice coil to reduce as much as possible harmonic distortion and 41 Kf
03-05-2019
1
2 harmonic distortion. The present invention will be described in detail by the illustrated
embodiment. The even number (two in the figure) of the speakers 1 and 2 are attached to the
buckle 5a of the cabinet 5 so that the opening direction of the diaphragm 3.4 is the same. . The
magnetic circuit 6.7 and the voice coil 8.9 of both the speakers 1 and 2 have the same structure,
but one speaker 1 has the same structure as a general-purpose speaker, and the magnetic circuit
6 and the voice coil 8 Are disposed such that the magnetic gap 10 is located on the diaphragm 3
side. On the contrary, the magnetic circuit 7 and the die coil 9 of the other speaker 2 are
disposed such that the magnetic gap 11 of the magnetic circuit 7 is located on the opposite side
to the diaphragm 4, and the voice in the magnetic gap 11 is The coil 9 and the diaphragm 4 are
connected by a connecting rod (3) 12 which penetrates the inside of the center pole.
13.14 shows a damper. The above-mentioned speakers 1 and 2 are connected in series as shown
by a solid line and as shown by a dotted line so that the voice coils 8 and 9 are shown by a solid
line so that the diaphragms 3 and 4 can vibrate in the same direction. Or in series-parallel
connection, 15 is a wire for connection, and 16 is an input terminal. That is, the voice coil 8.9 is
connected such that the direction of the current flowing through the voice coil 8.9 is reverse.
Therefore, when an electrical input is applied to the input terminal 16, the diaphragms 3.4 of
both the speakers 1 and 2 vibrate in the same direction, so the fundamental waves radiated from
the two speakers 1.2 are synergistically increased. On the contrary, since the voice coils 8 and 9
of both speakers 1 and 2 move in the opposite direction to the magnetic gap 10 and IIK, the
current distortion generated from the relation between the magnetic circuit and the voice coil is
canceled out. The second harmonic distortion is very small with respect to the fundamental wave.
If a short ring made of copper or the like is attached to the center pole of (4) in the magnetic
circuit 6.7 of both the speakers 1 and 2, it is possible to reduce the number 314 at the same
time. 11 · · Since the present invention is configured as above, even when using an even number
of loudspeakers, harmonic distortion, especially the second harmonic distortion as much as
possible without affecting the fundamental wave at all. Can be reduced to
03-05-2019
2
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