JPS63313998

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DESCRIPTION JPS63313998
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker system in which an acoustic pipe for guiding a sound wave is disposed on the front
surface of a speaker diaphragm. In the prior art, a horn or an acoustic tube is provided on the
front of the speaker diaphragm, and the method of guiding the sound wave generated from the
diaphragm to the opening provides a large output sound pressure as compared to the case where
the horn or the acoustic tube is not used. In addition, there are advantages such as being able to
transmit sound in a specific direction, etc., which has been widely used conventionally.
Hereinafter, with reference to the drawings, FIG. 4 for explaining a conventional speaker system
having a horn and an acoustic pipe will be described. FIG. 4 shows a cross-sectional view of the
structure of the speaker system. In FIG. 4, 1 is a speaker unit, 2 is a pack capacitance, 6 is a horn,
and 8 is a sound path. The operation of the speaker system having the horn and the acoustic
tube configured as described above will be described below. The horn 6 which becomes small
gradually in area near the diaphragm and approaches the opening is arranged on the front part
of the speaker diaphragm, and the back part of the speaker diaphragm is radiated to the outside
It arranges the pack capital 2 so as not to let it do. If the length of the horn 6 is sufficiently
longer than the wavelength of the reproduction band to be reproduced, the reproduction sound
pressure frequency characteristic has a flat characteristic. Problems to be Solved by the
Invention However, in the configuration as described above, when the horn length can not be
made long enough to be incorporated in the device, the reproduction sound pressure frequency
characteristic has many peaks and dips and a characteristic with many peaks and valleys.
Become. For example, FIG. 2 shows a reproduced sound pressure frequency characteristic
diagram of a speaker system having a horn and an acoustic tube. In the figure, the characteristic
B is the characteristic of a conventional speaker system having a horn or an acoustic tube as
shown in FIG. 4, for example. That is, if the horn length is short, the reflected wave due to the
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acoustic impedance change at the opening end is large, and the resonance phenomenon
determined by the tube length occurs, so that the reproduced sound pressure frequency
characteristic has many peak dips. . SUMMARY OF THE INVENTION In view of the above
problems, the present invention provides a speaker system capable of obtaining flat frequency
characteristics without peak-dip due to resonance even in a speaker system having a short horn
and a short acoustic pipe. Means for Solving Problems To achieve this object, the speaker system
of the present invention has a small area inside the horn and the acoustic tube in front of the
diaphragm, and the area increases as it approaches the opening. The horn wall is made of a
sound absorbing material.
In the present invention, the sound wave generated by the diaphragm of the speaker unit is
guided to the opening by the horn or the acoustic tube, but the change in the acoustic impedance
at the opening is large and a reflected wave is generated, which is determined by the tube length
Since the resonance occurs at the frequency, the reproduction frequency characteristic is a large
peak and valley characteristic, but by arranging the sound absorbing material inside the horn and
the acoustic tube, these reflected waves are absorbed and peak dip Is eliminated, and a flat sound
pressure frequency characteristic can be obtained. Further, the sound wave generated on the
front surface of the diaphragm can pass through the space provided in the central portion
without blocking by the sound absorbing material, and can reproduce up to the high sound
range. EXAMPLES Examples of the present invention will be described with reference to the
drawings. FIG. 1 shows a cross-sectional view of a speaker system according to an embodiment
of the present invention. In FIG. 1, 1 is a speaker unit, 2 is a pack cavity, 3 is an acoustic pipe for
guiding a sound wave generated on the front surface of the diaphragm of the speaker unit 1, 4 is
disposed inside the acoustic pipe 3 and the sound path is in the center. A sound absorbing
material provided with a part, 5 is a sound path part. The operation of the speaker system
configured as described above will be described below. The sound on the rear surface of the
diaphragm of the speaker unit 1 is closed to the cavity 2, but the sound wave emitted on the
front surface of the diaphragm is conducted to the opening through the acoustic tube 3 and
emitted. However, due to the rapid change in acoustic impedance generated at the opening, a
part of the sound wave guided to the opening becomes a reflected wave and tries to return to the
diaphragm surface. The sound wave is absorbed by the sound absorbing material disposed inside
the acoustic tube to prevent the generation of a standing wave inside the acoustic tube. Further,
the sound absorbing material 4 has a shape in which the thickness of the sound absorbing
material in the vicinity of the opening is thin and the thickness of the sound absorbing material
in the vicinity of the speaker unit 1 is thick. The change in impedance of is reduced to enhance
the sound absorption effect. Further, since the sound path is provided at the center of the sound
absorbing material 4, the sound wave generated from the vibration is guided to the opening
without being blocked by the sound absorbing material 4. FIG. 2 shows reproduced sound
pressure frequency characteristics of a speaker system having a horn and an acoustic pipe,
comparing the present invention with the conventional example. The characteristic B in the
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conventional example is a large characteristic of peaks and valleys because standing waves are
generated in the acoustic pipe, but as shown to the characteristic prisoner of the speaker system
of the present invention, flat reproduction sound pressure frequency characteristics can be
obtained up to high range I understand that.
FIG. 3 shows a speaker system according to another embodiment of the present invention. In FIG.
3, 6 is a horn, 7 is a sound absorbing material disposed inside the horn, and 8 is a sound path.
The operation and effects of this embodiment are the same as those of the speaker system of the
embodiment shown in FIG. Effect of the Invention As described above, according to the present
invention, the sound absorbing material is disposed inside the acoustic pipe or the horn, so that
the peak of the reproduced sound pressure frequency characteristic by the standing wave found
in the conventional acoustic pipe or the horn It is possible to obtain a flat characteristic up to a
high frequency region without causing a dip.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a structural cross-sectional view of one embodiment of the speaker system of the
present invention, FIG. 2 is a sound pressure frequency characteristic diagram of the speaker
system, and FIG. 3 is a structural cross-sectional view of another embodiment of the speaker
system of the present invention FIG. 4 is a cross-sectional view of a conventional speaker system.
1 ...... speaker unit, 2 ...... cavity, 3 ...... acoustic tube, 4 ...... acoustic material 6 ...... sound road
section, 6 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · sound path part. Name of agent
Attorney Nakao Toshio and 1 other 1---C-Sword; S L Figure 2 M 秩-Chichi 3 Figure 6-Houts
Figure 4 δ
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