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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker system, and more particularly, to a speaker system that improves the counteracting
property of a frame caused by the vibration of a diaphragm, directivity characteristics, and sound
field. In "conventional technology" audio equipment and AV equipment, a pair of speaker systems
having a plurality of speakers attached to the enclosure are prepared, and music signals of the
left and right channels are reproduced from both speaker systems. It is common to perform
stereo reproduction. [Problems to be Solved by the Invention] By the way, stereo reproduction
using the conventional speaker system has the following problems. That is, in stereo
reproduction, the sound wave of the right gouannel is ideal for listening only to the right ear and
the sound wave for the left channel is listening to only the left ear, but in reproduction in general
lighting room, the sound wave for the left channel is right This wraparound to the ear, or
wraparound of the right channel sound wave to the left and right, was inevitable, and it was
impossible to achieve this ideal unless headphones were used. Also, in the case of the dynamic
speaker used in the above speaker system, that is, the sliding force of the system in which the
diaphragm is integrally moved with the voice coil by the repulsive force generated between the
voice coil and the permanent magnet, the diaphragm operates. It is inevitable that a reaction
occurs in the permanent magnet during the operation. Since this reaction displaces the speaker
frame integral with the permanent magnet or the baffle surface of the enclosure supporting the
same, a part of the energy generated in the voice coil is converted into these motions to generate
musical tones. As well as not being able to expect so-called sharp start-up reproduction, a sound
source is generated in addition to the diaphragm which should be vibrated originally, so there is
a problem that the feeling of the sound field is impaired. Furthermore, when a so-called cone type
speaker is used, it can not be avoided that sound waves generated from the surface of the
concave diaphragm have specific directivity, and the area (so-called service area) where good
stereo feeling can be obtained is narrow. There was a problem that. The present invention has
been made in consideration of the above circumstances, and the object of the present invention is
to realize a sharp start-up reproduction, to obtain a good sound field feeling, and to expand a
service area. To provide a speaker system. [Means for Solving the Problems] In order to solve the
above-mentioned problems, the present invention substantially coaxially arranges two speakers
provided with conversion means for converting an electric signal to mechanical vibration on one
surface of a diaphragm. Further, the conversion means are butt-joined to each other and joined,
and the other side of one speaker is joined to the buckle face inward.
[Action] The sound waves generated from one surface of the re-vibration plate and the sound
waves generated from the other surfaces have opposite phases, and it is possible to cancel the
sound waves traveling from one channel to the other channel It is. Also, since the conversion
means are butted and joined to each other, the reaction of the frame accompanied by the
movement of the diaphragm is offset, and the electrical energy of the music signal is effectively
converted to the movement of the diaphragm. Hereinafter, embodiments of the present invention
will be described with reference to the drawings. 1 to 3 show an Mx embodiment. In FIG. 1,
reference numeral 1.2 denotes a dynamic speaker. The code | symbol 3 is a cone-shaped
diaphragm of a speaker 1 degree 2. FIG. The ball 4 and the magnet 5 are sequentially attached
on the same axis to one surface of the diaphragm 3, and the voice coil 6 is moved by the
repulsive force (or suction force) acting between these and the voice coil 6. The flowing electric
signal is converted into the vibration (kinetic energy) of the diaphragm 3. The ball 4 and the
magnet 5 are covered with a yoke 7, and the yoke 7 supports a frame 8 for supporting the
diaphragm 3. Reference numeral 9 is an edge connecting the diaphragm 3 and the frame 8,
reference numeral 10 is a damper interposed between the diaphragm 8 and the frame 8 to
support the diaphragm 3, reference numeral 11 is a center cap, and reference numeral 12 is the
voice coil. The lead wire connected to 6 and the code | symbol 13 have shown the ball guide,
respectively. The speakers 1 and 2 are substantially coaxially butted and brought into contact
with each other by means of the yokes 7.7, whereby the surfaces 14 ░ 15 of the respective
diaphragms 3 and 3 are directed in the opposite direction. . Since the speakers 1 and 2 have the
same specifications, the magnets 5.5 of both have the same polarity, and the winding directions
of the voice coil 6.6 are also the same. . Therefore, the combination of the speakers 1.2 is
mounted in a state where the south poles (or north poles) are butted. Furthermore, as shown in
FIG. 2, the diaphragm 3 of one speaker 1 is attached to the opening 17 provided in the buckle
surface of the enclosure 16, and the diaphragm 3 of the speaker l has the opening 17. It is
exposed to the inside of the enclosure 16 through. In the above speaker system, both voice coils
6.6 are used connected in phase to the signal source (usually the output of the power amplifier),
and in this case, the diaphragm 3.3 vibrates in the opposite direction to each other. A sound wave
in phase is generated from the surface 14.15, and a back surface 18.19 generates a sound wave
in opposite phase thereto.
Further, as the diaphragms 3 and 3 vibrate in opposite directions, the reaction caused to the
magnet 5 and the yoke 7 integral with the diaphragm 5 is canceled with the operation of the
diaphragm 3.3, and the speaker 1 resulting therefrom , 2 and the enclosure 16 supporting the
same. Furthermore, in the case of the embodiment, since the south poles or the north poles of
both magnets 5 and 5 are made to face each other, the leakage flux to the outside is canceled and
a magnetic shielding effect is generated, which is a part of the AV system. Even when placed near
the image monitor, it does not cause uneven color. Although a pair of identical speakers is used
in the above embodiment, the voice coils may be connected in reverse phase to the signal source
by combining the speakers whose polarities are reversed as shown in the figure. , And similar
operations can be performed. Next, an example of using stereo reproduction by the above
speaker system will be described with reference to FIG. In FIG. 3, reference numeral 20 denotes
the above speaker system. First, a pair of speaker systems 20.20 are prepared, and the side
surfaces 21 of the enclosure 16 joined to the speakers are arranged to face each other to operate
the speaker systems 20.20. Here, focusing on the speaker system 20 in the left channel (the left
side in the figure) and assuming that the sound wave generated from the back surface 18.19 of
the diaphragm 3.3 is L, it is generated from the surface 14.15 of the diaphragm 3.3 The resulting
sound wave is -L in antiphase with L. Also, since the surface 14 of the diaphragm 3 of the
speaker 1 is connected to the enclosure 16, the sound waves generated there will not leak to the
outside of the enclosure 16 (however, in the case of a bass reflex type erosion, it does not Only
the low frequency component of the signal is phase inverted and emitted from the bass reflex
port). Therefore, the sound wave diffused from the speaker system 20 to the outside is generated
from the sum of the noise generated from the back surface 18.19 of both speakers 1.2
diaphragm 3.3, 2L, and the surface 15 of the diaphragm 3 of the speaker 2 It becomes two kinds
of one L. Then, since the sound wave 2L generated from the back surface 18.19 is generated
from the diffusive convex surface, it is diffused almost all around the speaker system 20 and
mainly reaches the left ear of the listener A, while the surface Since the sound waves generated
from the light source are directed from the concave surface, they are directed mainly to the right
ear of the listener A so as to reach the right ear of the viewer A from the back face 18.19. Offset
part of the sound wave 2L.
Similarly, in the speaker system 20 of the right channel (right side in the figure), the sound wave
2R and the sound wave -R are generated, but the sound wave 2R mainly reaches the right ear of
the listener A and the sound wave -R is the listener A's It offsets part of the sound wave 2R that
tries to reach the left ear. Therefore, the sound wave trying to reach the right ear from the left
channel and the sound wave trying to reach the left ear from the right channel are respectively
canceled, and the sound wave generated from the left channel of the listener A is the left ear
Only sound waves generated from the right channel can be heard only by the right ear, and the
correct stereo sound field is reproduced. In addition, since the reaction due to the movement of
the diaphragms 3 and 3 cancels each other out, all the electric signals are converted to the
movement of the diaphragm 3 ░ 3 to obtain a so-called sharp rising reproduction sound, and It
is possible to reliably regulate the vibration from the erosion, etc.) and achieve a good sound field
feeling. FIG. 4 is a view showing a second embodiment in which the above-described speaker
system 20 is improved. In FIG. 4, a lock 21 is provided on the frame 8 of the speaker 2 of the
speaker system 20, and the lock 21 supports the equalizer 22. The fasteners 21 are spaced from
one another in the circumferential direction of the frame 8 to support the equalizer 22 at a
plurality of locations. (It is desirable that the fastener 21 be as small as possible so as not to
impede the emission of sound waves from the front of the speaker. And the ring-shaped equalizer
22 as a whole can be regarded as a nearly spherical wave due to the difference in path distance
between the high-pitched high-pitched sound passing through the center of the ring and the
sound wave passing outside the ring. It performs the function of combining to improve the
directional characteristics of the speaker. [Modifications] i The structure of the erosionr may be
any structure such as a closed type, a bath reflex type, an open rear surface type, and a flat type.
In particular, in the case of an open rear type, flat type enclosure, since the back pressure applied
to the speaker 1 is eliminated, the vibration plate of the speaker 1 is not affected by the back
pressure by the enclosure and the vibration of the other speaker 2 is It is possible to operate
under the same conditions as the plate 3, and the above mentioned cancellation of the opposite
channel signal can be realized under ideal conditions. U In the above embodiment, a cone-shaped
diaphragm 3 ░ 3 is used, but the present invention is not limited to this, and it is needless to say
that the same effect can be expected even when, for example, a planar diaphragm is used. It is.
In the above embodiment, the yokes 7 of the pair of speakers 1 are joined in close contact with
each other. For example, in the case of a type speaker provided with an air vent for removing the
back pressure at the center cap of the diaphragm at the yoke, It is desirable to provide a space
for air flow between the yokes to be joined so as not to block the air vents provided. That is, a
spacer may be interposed between the yokes of a pair of speakers, and the yokes of both
speakers may be joined via the spacers. In addition, since the leakage flux offsetting ability of the
magnet is reduced due to the presence of the spacer (due to the distance between the magnets of
both speakers being separated), the space may be narrowed within a range that does not hinder
the flow of air. desirable. iv In the above embodiment, the case where t is applied to a so-called
dynamic speaker is shown, but other types of speakers may be used as long as a method of
converting an electrical signal into mechanical vibration to move a diaphragm is adopted. Of
course. The connection point of the V 2 loudspeakers is not limited to the yoke portion as in the
embodiment, and components on the moving side (poise coil) and components on the fixed side
(magnets forming the conversion means between electrical signals and mechanical vibration) Of
course, any part of the fixed part may be connected with the yoke). [Effect of the Invention] The
speaker system of the present invention exhibits the following excellent effects. ? The sound
wave generated from the surface of the diaphragm and the sound wave generated from the back
of the diaphragm have opposite phases, and the sound wave generated from the surface cancels
part of the sound generated from the back, so it is used in stereo If so, it becomes possible to
hear the sound wave of the left channel only with the left ear and the sound wave of the right
channel only with the right ear. ? Since the diaphragms of the loudspeakers face each other
substantially coaxially, the reaction generated on the magnet or yoke with the movement of the
diaphragms is offset, and the electrical energy is effectively converted to the movement of the
diaphragms, so-called standup Sharp sound is realized. (2) Since the sound wave generated
mainly from the back surface (convex surface) of the diaphragm is to be listened, this sound wave
is diffused in almost all directions of the speaker and the so-called service area is expanded to
obtain a good stereo feeling over a wide range. Can.
Brief description of the drawings
1 to 3 show the first embodiment of the present invention, wherein FIG. 1 is a cross-sectional
view of the main part of the speaker system, and FIG. 2 is a perspective view showing its outline,
FIG. These are top views which show a use condition.
FIG. 4 is a cross-sectional view showing the main parts of a speaker system according to a second
embodiment of the present invention. 1.2
ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии = 15 ...... surface (surface), 16 ... ... enclosure, 18.19 ...... surface
(back surface).
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