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JPS6062799

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DESCRIPTION JPS6062799
[0001]
The present invention relates to an airflow speaker system that vibrates air directly to generate
sound without using a diaphragm. Conventionally, as this type of air flow speaker, one
configured as shown in FIG. 1 is known. In the figure, reference numeral 1 denotes a yoke, 2 a
magnet, 3 a pole piece, 4 a voice coil, 5 an intake and exhaust valve, 6 a pressure control
mechanism, and 7 a horn. The pressure control mechanism 6 is divided into an air supply unit 6a
and an air intake unit 6b. The air supply unit 6a is connected to a gas supply pipe 8a for always
pumping air, and the air intake unit 6b sucks air. An intake pipe 8b for leading to the outside is
connected. The intake / exhaust valve 5 is provided with an inlet side boat portion 5a in
communication with the air supply portion 6a and the intake portion 6b, and an outlet side port
portion 5b in communication with the internal space of the horn 7. According to the abovedescribed air flow speaker, the inlet-side boat portion 5a is connected to the air supply portion
6a and the air intake portion 6b by moving the intake and exhaust valves 5 in the direction of
arrow A2B shown in FIG. I will pass. As a result, air pressurized to a constant pressure is released
into the internal space of the horn 7, and air is sucked from the internal space of the horn 7 to
directly vibrate air in the internal space of the horn 7. It emits noise. However, since the air flow
is controlled by the intake and exhaust valve 5 to emit a sound wave, there is a problem that
noise is generated due to the turbulent air flow, so the S / N ratio of the reproduction sound is
bad. It could not be used and was not used for fatigue testing of 'tA' or for anything other than
specifically requiring a large sound output. The present invention has been made in view of the
above circumstances, and an object of the present invention is to provide an air flow speaker
system which can be used for normal sound reproduction by improving the S / N ratio. The
present invention is provided with an acoustic chamber that emits sound after attenuating or
cutting the high range without directly emitting a sound wave, noting that noise due to air
turbulence is particularly high range noise. It is characterized by An embodiment of the present
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1
invention will be described below with reference to the drawings. FIG. 2 shows a first
embodiment of the present invention. According to this embodiment, the acoustic chamber 11 of
a closed structure is equipped on the front side (sound output side) of the airflow speaker 10.
The acoustic chamber 11 is formed in a box shape, and the passive radiator 12 is mounted on
the wall portion lea facing the air flow speaker 10. The sound wave from the air flow speaker 10
is not emitted directly into the evening space, but is radiated into the acoustic chamber 11 and
emitted through the pansy bracer 12 to the evening space (partial space.
At this time, the high frequency range of the sound waves to be emitted is cut by the passive
radiator 12. That is, a high range including many noise components is cut and emitted. In the air
flow speaker 10, a high pressure chamber 14 and a low pressure chamber 15 are integrally
combined. A vacuum pump 17 is provided on the partition wall 16 between the high pressure
chamber 14 and the low pressure chamber 15, and a discharge portion 17. 1 is disposed on the
high pressure chamber 14 side, and its suction portion 17 b is disposed on the low pressure
chamber 15 side. When the vacuum pump 17 is operated, air is sucked from the low pressure
chamber 15 and discharged to the high pressure chamber 14, and the high pressure chamber 14
and the low pressure chamber 15 are maintained at predetermined pressures. FIG. 3 shows the
air flow speaker 10 in detail. In the figure, 18 is a coke, 19 is a magnet, 20 is a pole piece, 21 is a
voice coil, and 22 is an intake and exhaust valve. The intake and exhaust valves 22 interlock with
the voice coil 21 and are guided by the walls of the high pressure chamber 14 and the low
pressure chamber 15 to move in the directions of arrows C and D shown in FIG. The intake /
exhaust valve 22 includes an inlet-side part 22a 'communicating with the air-feeding hole 14a
provided in the high pressure chamber 14 and the air-intake hole 15'a provided in the low
pressure chamber 15, And an exit side boat portion 22b. The passage 22C which connects the
inlet boat portion 22a and the outlet boat portion 22b is considered so as to smooth the flow of
air and prevent the generation of a flow noise. If the inlet-side hood 22a coincides with the air
supply holes 14a in the process of moving the intake / exhaust valve 22 in the direction of arrow
C shown in FIG. 3 from the neutral position shown in FIG. (4) When the inlet-side boat 22a
coincides with the intake hole 15a in the process of the air pressurized constantly from the high
pressure chamber 14 being delivered to the acoustic chamber 11 and moving in the direction of
the arrow shown in FIG. Air from the acoustic chamber 11 is drawn into the low pressure
chamber 15 (see FIG. 5). As a result, the air in the vicinity where the outlet port 22b in the
acoustic chamber 11 sinks is vibrated to generate an acoustic wave, and this acoustic wave is
emitted into the acoustic chamber as described above and is externally transmitted via the panblade brace 12. It is emitted into space. FIG. 5 shows a second embodiment of the present
invention. According to this embodiment, the vacuum pump 17 is disposed on the row side of the
high pressure chamber 14 and the low pressure chamber 15, and the discharge portion 17a and
the suction portion 17b are high pressure chamber 14 and low pressure via the air hoses 23a
and 23b. It is connected with the room 15. The other configuration is the same as that of the first
embodiment described above.
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In the first and second embodiments, there is no air flow into and out of the row portion, and the
invention can be applied to an intake and exhaust type air flow speaker. FIG. 6 shows a third
embodiment of the present invention. According to this embodiment, the acoustic chamber 11
has an open structure, and the sound emission holes 24 are formed at both end positions of the
wall portion 11 a not facing the air flow speaker 10. The sound wave from the air flow speaker
10 is repeatedly reflected by the central portion of the wall portion 11, the wall portion 11b, and
the like, and then emitted from the sound emission hole 24 to the external space. Therefore,
among the sound waves to be emitted, the high range is low in energy and thus is attenuated
each time reflection, and when emitted from the sound release hole 24, the high range including
many noise components can be cant. This third embodiment has external space and air in and
out, and can be applied to various types of air flow speakers. FIG. 7 shows a fourth embodiment
of the present invention. According to this embodiment, the acoustic chamber 11 is constituted
by a plurality of stages of resonance type sound absorption chambers 25. The sound wave from
the air flow speaker 10 is cuffed in the high range in the process of passing through the multiple
stages of the resonance type sound absorption chamber 25. In this case, the cut range of the high
tone range can be variously controlled by the number of combination stages of the resonance
type sound absorbing chamber 25 or the like. In this embodiment, a pressure control mechanism
as shown in FIG. 1 is separated from the air flow speaker 1o, and the compressor 26 is connected
to the pressure control mechanism. In the first to fourth embodiments described above, glass
wool or the like may be filled in the acoustic chamber 11 in order to increase the internal loss. As
described above, according to the present invention, the air flow speaker equipped with the
intake and exhaust valve is equipped with an acoustic chamber that emits high frequency sound
without direct sound emission and then emits it into the external space after sound attenuation.
Because the air flow is controlled by the intake and exhaust valves and converted to sound
waves, air turbulence occurs, and even if noise (high noise noise) is generated due to this air
turbulence, noise is emitted in the external space When it is played, it does not include highpitched noises, and it is possible to reproduce a bass with a good S / N ratio. Therefore, according
to the present invention, it can be used particularly for sound reproduction.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a cross-sectional view of a conventional air flow speaker, FIG. 2 is a schematic crosssectional view showing a first embodiment of the air flow speaker system of the present
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invention, and FIG. 3 is a cross-sectional view of the air flow speaker portion. a and b are
operation explanatory views, and FIGS. 5 to 7 are schematic solution sectional views showing
second, third and fourth embodiments.
DESCRIPTION OF SYMBOLS 10 ... Air flow speaker 11, 11 ... Acoustic chamber, 12 ... Panci
bragita, 24 ... Sound emission hole, 25 ... Resonance type sound absorption chamber, 22 ... Intake
and exhaust valve. ---
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