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JPH05236585

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DESCRIPTION JPH05236585
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
loudspeaker system having an acoustic tube for directing sound waves to the front of the
loudspeaker.
[0002]
2. Description of the Related Art Conventionally, a method of providing a horn or an acoustic
tube on the front surface portion of a speaker diaphragm and guiding a sound wave generated
from the diaphragm of the speaker to the opening is compared to the case where the horn or the
acoustic tube is not used. It is widely used because it has advantages such as a large pressure and
the ability to transmit sound in a specific direction.
[0003]
As shown in FIG. 6, the conventional speaker system 1 is composed of a speaker 2 and a horn 3
disposed on the front surface of the speaker 2.
A speaker diaphragm 4 is disposed on the front of the speaker 2, and an opening as a horn inlet
5 is provided on the front of the speaker diaphragm 4, and a horn outlet 6 on the opposite side
of the speaker. An opening is provided.
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[0004]
The horn 3 is formed such that the cross-sectional area of the opening gradually increases as it
approaches the horn outlet 6 from the horn inlet 5. The frequency characteristics of the speaker
system 1 formed in this manner can be such that good frequency characteristics can be obtained
if the length of the horn 3 is sufficiently longer than the wavelength of the band to be
reproduced.
[0005]
However, in the configuration as described above, when the speaker system 1 is incorporated
into, for example, a television set, a sufficient horn length for the wavelength can not be obtained,
so the change in acoustic impedance at the horn outlet 6 becomes large. At the same time, due to
the occurrence of the reflected wave, the frequency characteristic with many peaks and dips as
shown in FIG. 7 was obtained.
[0006]
Therefore, in order to obtain flat frequency characteristics with less peak dip, for example, in
Japanese Unexamined Patent Publication No. 63-313998, a horn formed of a sound absorbing
material is disposed in front of the speaker diaphragm of the speaker unit. What is shown.
However, since the horn is formed of a sound absorbing material, the process becomes
complicated in order to manufacture many of the same shape, which is a factor of high cost. In
addition, since the sound absorbing material is disposed almost all over the inside of the acoustic
tube, there is a problem of upsizing.
[0007]
On the other hand, in order to solve the above problems, as shown in FIG. 8, an acoustic tube 7
for guiding a sound wave to the front of the bass speaker 2a and the treble speaker 2b is
disposed in JP-A-1-276997. A speaker system 1 'is proposed. The speaker system 1 ′ is
provided with a horn portion 3 ′ made of a partition plate inside the acoustic tube 7 and filling
the sound absorbing material 8 between the partition plate forming the horn portion 3 ′ and
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the acoustic tube 7. Thus, slits 3a and 3b are provided in the portion of 1/3 of the length of the
acoustic pipe from the side of the speaker of the horn portion 3 'and the opening portion on the
tip side. By providing the slits 3a and 3b, the horn portion 3 'absorbs the reflected wave by the
sound absorbing material 8 when a part of the sound wave guided to the horn outlet 6' returns
as a reflected wave. The generation of a standing wave inside the acoustic tube 7 is prevented.
[0008]
The back cavity is omitted in FIG. 6 and FIG.
[0009]
However, in the above-mentioned speaker system, the packing density of the sound absorbing
material between the acoustic pipe and the partition plate causes characteristic variations, and in
order to make this characteristic constant, The complexity of the work has been a factor in high
costs.
Furthermore, since the bass speaker and the treble speaker are provided in the same horn, there
is a problem that the treble band of the bass speaker interferes with the range of the treble
speaker.
[0010]
The present invention is intended to eliminate the above-mentioned problems, and to stabilize a
frequency characteristic without increasing the length of an acoustic tube, and to provide a
speaker system inexpensively in which the sounds of two speakers do not interfere with each
other. There is.
[0011]
SUMMARY OF THE INVENTION A loudspeaker system according to the present invention
comprises a loudspeaker system having two loudspeakers and an acoustic tube for guiding a
sound wave to the front of the diaphragm of at least one loudspeaker. A first acoustic pipe, which
is disposed and gradually decreases in cross-sectional area from the acoustic pipe inlet toward
the acoustic pipe outlet, and is connected to the first acoustic pipe to have a cross-sectional area
as the first acoustic pipe A second acoustic pipe gradually increasing from the joint portion of the
first to the acoustic pipe outlet, and a first partition plate disposed at a central portion of the joint
portion between the first acoustic pipe and the second acoustic pipe A pair of adjustment plates
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extending from the connecting portion toward the inlet of the acoustic pipe at both ends of the
partition plate, a sound absorbing material surrounded by the pair of adjustment plates and the
first partition plate, and Sound pipe outlet end from the connecting part at both ends of the
Distribution and the second partition plate pair to be set, a tip center of said acoustic tube outlet,
and a second speaker disposed in the pair of second partition plates up.
[0012]
According to the speaker system having the above-described structure, the sound wave
generated by the diaphragm of the first speaker gradually decreases in cross-sectional area from
the sound pipe inlet toward the sound pipe outlet, and has the adjusting plate. The disturbance of
the radiation impedance is reduced by leading to the acoustic tube.
In addition, the sound absorbing material filled between the first partition plate and the adjusting
plate absorbs the reflected wave inside the acoustic pipe to suppress the generation of the
standing wave and has a good frequency with less peak dip. In addition to the characteristic, the
high range of the first speaker is cut.
Furthermore, interference with the first speaker is prevented by the second partition plate
provided to the first partition plate and the second acoustic pipe.
[0013]
Embodiments of the present invention will be described hereinbelow with reference to the
drawings. 1 to 3 relate to an embodiment of the present invention, and FIG. 1 is a perspective
view of a part of the speaker system, and FIG. 2A is a top view of the speaker system of FIG. 1 is a
side view of the speaker system of FIG. 1, and FIG. 3 is a characteristic diagram showing
frequency characteristics of the speaker.
[0014]
The configuration of the speaker system will be described with reference to FIGS. 1 and 2. As
shown in FIG. 1, the speaker system 10 includes a first speaker 21, a first sound tube 30
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disposed on the front of the speaker 21, and a second sound tube 30 connected to the first sound
tube 30. The second sound tube 40 and the second high sound speaker 22 disposed at the center
of the tip of the second sound tube 40.
[0015]
The first acoustic tube 30 has a cross-sectional area of the first acoustic tube 30 gradually from
the acoustic tube inlet 31 toward the first acoustic tube tip on the acoustic tube outlet side in
order to suppress disturbance of radiation impedance. It is formed to be smaller. The second
acoustic pipe 40 connected to the first acoustic pipe 30 has a gradually larger cross-sectional
area from the connecting part 41 connected to the first acoustic pipe tip to the acoustic pipe
outlet 42 It is formed to become.
[0016]
The first acoustic tube 30 is provided with a first partition plate 33 which is located at the center
of the connecting portion 41 and which divides a part of the first acoustic tube 30 and the
second acoustic tube 40. In addition, a pair of adjustment plates 34 for adjusting the acoustic
load is extended from both ends of the partition plate 33 to the acoustic pipe inlet 31 side. By
increasing the area of the first partition plate 33, the first partition plate 33 reduces the crosssectional area of the openings provided at both ends of the first partition plate 33, and the sound
wave outlet The sound load is increased by squeezing, and the sound load is increased by
increasing the length of the adjusting plate 34. That is, the acoustic load is adjusted by
appropriately setting the cross-sectional area of the first partition plate 33 disposed in the first
acoustic pipe 30 and the length of the adjustment plate 34 to reduce disturbance of the radiation
impedance. It can be done. Further, between the adjusting plate 34 and the first partition plate
33, a sound absorbing material 50 for absorbing the reflected wave generated in the acoustic
pipe is disposed.
[0017]
On the other hand, the second acoustic pipe 40 is provided with a pair of second partition plates
43 which divide the portion from the both sides of the first partition plate 33 disposed in the
connecting portion 41 to the acoustic pipe outlet 42 into three. On the other hand, a high sound
speaker 22 is disposed between the second partition plate 43 and the tip of the sound pipe outlet
42.
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[0018]
The operation of the speaker system 10 configured as described above will be described.
The sound wave emitted from the front surface of the diaphragm 23 of the first speaker 21 is
emitted from the acoustic pipe outlet 42 through the first acoustic pipe 30. At this time, the
sound wave radiated from the first speaker 21 gradually decreases in cross-sectional area from
the acoustic pipe inlet 31 toward the connecting portion 41 and is adjusted with the first
partition plate 33 set to an appropriate size. While suppressing the disturbance of the radiation
impedance in the first acoustic pipe 30 in which the sound absorbing material 50 is disposed
between the first partition plate 33 and the adjusting plate 34, the sound absorbing material 50
is provided. While absorbing the reflected wave generated in the acoustic pipe, the high
frequency range component of the first speaker 21 is cut. Further, when the sound wave of the
first speaker 21 is cut in a high sound range and emitted from the sound pipe outlet 42, the first
partition plate 33 and the second partition plate 43 provided in the sound pipe are provided.
Thus, it does not interfere with the second high tone speaker 22.
[0019]
Thus, as shown in FIG. 3, the speaker system 10 of the present invention can obtain frequency
characteristics with less peak dip at the second acoustic pipe outlet 72.
[0020]
Further, a sound absorbing material 50 is provided at the connecting portion 41 between the
first acoustic pipe 30 and the second acoustic pipe 40, and a second speaker 22 for high sound is
provided at the center of the tip of the acoustic pipe outlet 42. Thus, the sound absorbing
material 50 and the high sound second speaker 22 can be accurately and easily attached to the
predetermined position.
[0021]
Furthermore, since the first acoustic tube 30 and the second acoustic tube 40 can be
manufactured by integral molding, productivity is improved.
[0022]
Since the speaker system 10 is engaged with a dowel or the like attached to the wall of the
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television cabinet with a screw or the like, the speaker system 10 need not necessarily be in close
contact with the wall so that the first acoustic tube 30 and the second The shape of the acoustic
tube 40 can be freely set.
[0023]
4 and 5 relate to a modification of this embodiment, and FIG. 4 is a side view of the speaker
system, and FIG. 5 is a partial cross-sectional perspective view of the speaker system.
[0024]
As shown in FIGS. 4 and 5, the outer diameter shape of the speaker system 11 is matched to the
inner shape of the television set.
The other configuration, operation and effects are the same as those of the first embodiment.
[0025]
The back cavity of the first speaker 21 is omitted in the drawings of the embodiment and the
modification described above.
[0026]
As described above, according to the present invention, it is possible to stabilize the frequency
characteristics without increasing the length of the acoustic tube and to provide a speaker
system at low cost, in which the sounds of two speakers do not interfere with each other. Can.
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