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JPH02199993

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DESCRIPTION JPH02199993
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker apparatus in which an acoustic tube for guiding a sound wave is disposed on the front
surface of a speaker unit. The method of providing a horn or an acoustic tube on the front
surface of the conventional speaker unit and 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 There is an advantage that sound is transmitted in a
specific direction, and so on, which has been widely used conventionally. Hereinafter, a
conventional speaker device using a horn and an acoustic tube will be described with reference
to the drawings. FIG. 6 shows a cross-sectional view of the above speaker device. In FIG. 6, 1 is a
speaker unit, 2 is a baffle plate on which the speaker unit 1 is mounted, 3 is a rear box provided
on the back of the speaker unit 1, 4 is an acoustic on which the speaker unit 1 is mounted on the
front of the baffle plate 2. The pipe 6 is a sound conducting portion constituted by the acoustic
pipe 4. The operation of the speaker apparatus having the horn and the acoustic tube configured
as described above will be described below with reference to FIG. FIG. 7 is a perspective view of
the acoustic tube portion showing the configuration of the acoustic tube portion in a partial
cross-sectional view. A hole 6 formed at the central portion of the buckle plate 2 is a hole for
guiding a sound wave emitted from the speaker unit 1 to the sound guiding portion 6 of the
acoustic tube 4. The dimension L1 and the baffle area are small, and as the opening of the
acoustic tube 4 is approached, the acoustic tube opening dimension L2 and the acoustic tube
cross-sectional area gradually increase. If the length L3 of the acoustic tube 4 is sufficiently
longer than the wavelength of the reproduction band to be reproduced, the reproduction sound
pressure frequency characteristic has a flat characteristic. SUMMARY OF THE INVENTION
However, there are many cases where the acoustic pipe length can not be long enough to be
incorporated into equipment with the above configuration, and the acoustic pipe opening cross-
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sectional area is the baffle area on the front of the speaker unit In many cases, it can not be taken
large enough compared with. For example, FIG. 8 is a perspective view of an acoustic pipe
portion in which the acoustic pipe opening is formed into a long and thin rectangular shape in
consideration of incorporation into a device. L4 indicates the rectangular side dimension of the
acoustic tube opening, and when the acoustic tube opening dimension L4 is smaller than the
baffle dimension L1 of the surface in the speaker unit attachment, the acoustic tube opening area
is larger than the buckle area of the front of the speaker unit Even in such a case, the sound
guiding portion 6 often has a structure which is once narrowed down on the way from the front
of the speaker unit to the opening of the acoustic pipe. That is, since the acoustic tube crosssectional area is once reduced, one acoustic space is formed on the front of the speaker unit, and
the same configuration as that of the acoustic tube 4 attached to the tip thereof is obtained.
FIG. 9 shows a reproduced sound pressure-frequency characteristic diagram of a speaker device
with a horn and an acoustic pipe. The characteristic of the figure is the characteristic diagram of
the conventional speaker apparatus with the horn and the acoustic tube shown in FIG. 6, and the
characteristic of B in the figure is the loudspeaker apparatus when it has the acoustic pipe shape
shown in FIG. Characteristic of ! ! In the case of the acoustic pipe shape shown in FIG. 8, since
one acoustic space formed on the front of the speaker unit works as compliance C, the high
frequency characteristic decreases as in the characteristic of FIG. 9B, and the acoustic pipe length
is short. In this state, the change in acoustic impedance generated at the opening of the acoustic
tube becomes large, and a part of the sound wave guided to the opening is generated as a
reflected wave inside the acoustic tube, resulting in a characteristic with many peaks and dips.
Further, in the case of the conventional speaker device having the above-described configuration,
the high frequency characteristic is reduced, and therefore, it is necessary to use a tweeter in
charge of the range reproduction as the sound reproduction device. The present invention solves
such problems, and even in a speaker device having a horn or an acoustic tube whose opening
has a long and narrow rectangular shape in consideration of incorporation into a device, the
reduction of high frequency characteristics is small, and further, An object of the present
invention is to provide a speaker device capable of obtaining a flat sound pressure frequency
characteristic without peaks and dips. Means for Solving the Problem In order to solve the
problem, the present invention arranges an acoustic tube for guiding a sound wave having a
rectangular opening at the front of the speaker unit, and the acoustic tube of the ring has an area
at the front of the speaker unit. So that the area is larger as the opening is approached, and the
speaker unit has a rectangular shape such that the long side direction of the acoustic opening
matches the long side direction of the rectangular speaker unit. It is arranged to be arranged in
According to this configuration, even in a speaker device having a horn or an acoustic tube
whose opening has a long and narrow rectangular shape in consideration of incorporation into a
device, a rectangular speaker unit is used at the same time as the long side direction of the
speaker unit and the acoustic tube. By arranging in such a way that the long side direction of the
opening matches, the area of the front of the speaker unit can be reduced, and hence the acoustic
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space acting as compliance C at the front of the speaker unit can be made extremely small. Since
the area of the sound conductor can be increased as it approaches the opening from the front,
the reduction of the high-frequency characteristic is small and the flat sound with few peaks and
dips without changing the shape of the opening and the length of the horn and the acoustic tube.
Pressure frequency characteristics can be obtained, and only the speaker device is in charge of
range reproduction Combination without the need for such eta, so that satisfactory as an acoustic
reproducing apparatus.
EXAMPLES Examples of the present invention will be described with reference to the drawings.
The same reference numerals as those in FIGS. 6 to 9 denote the same parts. FIG. 4 is a
perspective view of an acoustic pipe portion according to an embodiment of the present
invention. In FIG. 4, reference numeral 7 denotes a rectangular speaker unit attachment having a
hole for guiding the sound wave emitted from the speaker unit to the acoustic pipe 4 and is a
baffle plate for the opening, and 5 denotes sound conduction for guiding the sound wave having
a rectangular shape. The sound guiding portion 5 is configured to be smaller in area at the front
surface portion of the speaker unit and to be larger as it approaches the opening. FIG. 6 is a front
view showing a state in which the rectangular speaker unit 8 is attached to the buckle plate 7
constituting the acoustic pipe portion of the present invention shown in FIG. The operation of the
speaker apparatus provided with the acoustic tube portion of the present invention configured as
described above will be described with reference to FIGS. 1 to 3. FIG. 1 is a cross-sectional view
of an open rear speaker device provided with an acoustic tube according to an embodiment of
the present invention, and FIG. 2 is a cross-sectional view of the elliptical speaker unit shown in
FIG. FIG. 3 is a cross-sectional view of a diaphragm shown in cross section, and FIG. 3 shows the
elliptical speaker unit! −! It is a diaphragm sectional view shown by the section. In the speaker
apparatus of FIG. 1, the shape of the diaphragm 9 of the rectangular speaker unit 8 attached to
the baffle plate 7 differs between the long side direction and the short side direction, as shown in
FIGS. 2 and 3. Also, by arranging the long side direction of the opening of the acoustic tube 4 and
the long side direction of the rectangular speaker unit 8 to coincide with each other, the standing
wave generated inside the acoustic tube 4 can be suppressed. And flat sound pressure frequency
characteristics with few peaks and dips can be obtained. Further, by using the rectangular
speaker unit 8 in particular, it is possible to increase the radiation area of the sound guiding
portion 6 as it approaches the opening from the front surface of the rectangular speaker unit 8,
and the compliance on the front surface of the rectangular speaker unit 8 The acoustic space
working as C can be made smaller, and furthermore, unlike the axisymmetric shape of the
diaphragm of the conventional round speaker unit, the respective surfaces constituting the
diaphragm 9 are different in the long side direction and the short side direction. Sound pressure
frequency characteristics with less decrease in characteristics can be obtained, and effects such
as less decrease in compatibility characteristics in the left and right direction of the opening can
also be obtained. As described above, according to the present embodiment, by providing the
rectangular speaker unit 8 in the acoustic tube 4 configured so that the area is small at the front
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surface of the speaker unit and the area becomes larger toward the opening, A sound wave can
be naturally guided toward the opening of the tube 4 without resistance, and flat characteristics
can be obtained up to a high frequency range, and a speaker device with good clarity can be
realized.
Although FIG. 1 shows the rear face open type in one embodiment, it goes without saying that
the same effect can be obtained even in the case of the closed type and bass reflex type speaker
devices. Effects of the Invention As described above, according to the present invention, an
acoustic tube for guiding a sound wave having a rectangular opening is disposed on the front
surface of the speaker unit, and the acoustic tube has a small area on the front surface. The
speaker unit is formed in a rectangular shape such that the area increases as approaching the
opening, and the long side direction of the acoustic tube opening and the long side direction of
the rectangular speaker unit are aligned. By adopting the configuration, even in the speaker
apparatus having the long and narrow rectangular-shaped sound tube considering the
incorporation into the device, the sound space acting as compliance C can be reduced on the
front surface of the speaker unit, and the front surface of the speaker unit Since the area of the
sound conductor can be naturally enlarged without resistance as it approaches the opening from
the head, the decrease in high-pass characteristics is small, and peak and Tsu less flat sound
pressure frequency characteristics of flops can be obtained, there is an advantage that it is
possible to clarity good speaker apparatus without the turn together such tweeter.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a cross-sectional view of an open-ended speaker device provided with an acoustic pipe
portion according to an embodiment of the present invention, FIG. 2 is a cross-sectional view
showing the diaphragm shape in the long side direction of the rectangular speaker unit, and FIG.
The cross section n showing the diaphragm shape in the direction of the short side of the
rectangular speaker unit, FIG. 4 is a perspective view of an acoustic pipe portion according to an
embodiment of the present invention, and FIG. FIG. 6 is a cross-sectional view of a conventional
speaker apparatus having a horn and an acoustic tube, and FIG. 7 is a partial cross-sectional view
of the configuration of the conventional acoustic tube shown in FIG. FIG. 8 is a perspective view
of a conventional acoustic pipe section in which the opening of the acoustic pipe is a long and
narrow rectangular shape, and FIG. 9 is a characteristic view of the speaker device with a horn
and an acoustic pipe.
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4 ...... acoustic tube, 5 ...... sound guide part, 7 ...... baffle plate, 8 ...... rectangular speaker units, 9
...... roots Moving plate. Name of agent Attorney Attorney Shigeru Takano et al 1 list 1 Figure
sound If pipe I4 section baffle tough rectangular sub-sby soni contite t 2 図 り 図 り 図 り 弔 べ
べ べ 周波 周波 Hz Hz ■ (Hz)
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