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JP2006215510

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DESCRIPTION JP2006215510
[PROBLEMS] To provide a soundproofing device which can be easily attached to a window glass
and can completely soundproof the sound leaked from the window glass. A soundproof device
(10) attached to a window glass (18), a transparent flat speaker (20) attached to an indoor
surface of the window glass (18), and a noise detection device (22) disposed on an outdoor
surface of the window glass (18). And a control unit 52 for generating from the flat speaker 20 a
control sound to be interfered with and attenuated by the vibration wave detected by the noise
detection device. [Selected figure] Figure 1
Soundproofing equipment
[0001]
The present invention relates to a soundproofing device.
[0002]
As the soundproof structure of the window, the double structure or thickened window glass is
used for soundproofing, but since this is not sufficient, the following soundproofing devices have
been proposed conventionally.
Outdoor noise is detected by a microphone, and a control sound is generated so as to be an
interference wave that cancels out the detected noise from speakers provided at the upper and
lower portions of the indoor window frame (see Patent Document 1). Further, it comprises a
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microphone for detecting noise and a vibration generator for vibrating the window glass, and
vibrates the vibration generator so as to cancel the noise detected by the microphone and
attenuates the noise (see Patent Document 2). JP-A-8-305372 JP-A-8-314471
[0003]
In the soundproofing device of Patent Document 1 above, speakers are attached to the upper and
lower portions of the window frame to generate control sounds, but the noise generated from
these speakers cancels the noise leaking from the entire window glass. It is difficult. In the case
of the soundproofing device of Patent Document 2, it is difficult to vibrate so that the control
sound is generated from the window glass itself, and when the window glass is vibrated too
much, the vibration sound is transmitted to the window frame and it is more unpleasant Noise is
generated. Therefore, in view of the above problems, the present invention provides a
soundproofing device which can be easily attached to a window glass and can completely
soundproof the sound leaked from the window glass.
[0004]
The present invention relates to a soundproof device attached to a window glass, which is a
transparent flat speaker attached to the indoor surface of the window glass, and is disposed on
the indoor surface or the outdoor surface of the window glass. Soundproof, characterized by
comprising: vibration wave detection means for detecting the vibration wave of the above; and
control means for generating from the flat speaker the control sound to be interfered and
attenuated with the vibration wave detected by the vibration wave detection means. It is an
apparatus.
[0005]
According to the soundproofing device of the present invention, soundproofing can be performed
by generating from the flat speaker a control sound that interferes with and attenuates the
vibration wave corresponding to the noise detected by the vibration wave detection means.
In this case, since the sound is generated from the flat speaker mounted on the flat surface to the
window glass, the noise leaked from the window glass can be completely attenuated.
Furthermore, since the flat speaker is transparent, there is no discomfort even if it is attached to
the window glass.
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2
[0006]
Hereinafter, the soundproofing device 1 according to an embodiment of the present invention
will be described based on FIG. As shown in FIG. 8, the soundproofing device 1 attenuates the
sound input from the inlet 3 of a tube having a rectangular cross-sectional shape. In addition, a
sound shall be input only from the entrance 3 which is one end part of the sound transmission
space in this pipe | tube 2, and shall not be input from the circumference | surroundings of the
pipe | tube 2. FIG.
[0007]
A flat speaker 5 is attached to the outlet 4 at the other end of the tube 2. The flat speaker 5 is
attached in a plane so as to be orthogonal to the transmission direction so as to shield all the
outlet 4 of the tube 2. The inlet 3 is also provided with a vibration wave detection device 6 for
detecting a vibration wave of the sound to be input. For example, an acceleration pickup or a
microphone is used as the vibration wave detection device 6. A control device 7 comprising a
microcomputer is connected to the vibration wave detection device 6 and the flat speaker 5. The
control device 7 detects the vibration wave of the sound input from the inlet 3 detected by the
vibration wave detection device 6 and controls sound of the same sound pressure with the same
phase from the flat speaker 5 so as to attenuate the vibration wave. Output in a plane.
[0008]
Assuming that the distance from the inlet 3 to the outlet 4 (sound transmission distance) is L, the
processing time of the control device 7 can be set from this L. That is, while the sound passes
through the sound transmission distance L, the control device 7 performs processing to detect a
vibration wave and output a control sound. The processing time t = L / v. Where v is the speed of
sound.
[0009]
In the soundproofing device 1 of the present embodiment, the sound input from the inlet 3 of the
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tube 2 is all attenuated by the planar control sound generated from the flat speaker 5 and does
not go out from the outlet 4 of the tube 2 . In addition, since the control device 7 sets the
processing time t in accordance with the sound transmission time, the timing for generating the
control sound does not shift.
[0010]
In the above embodiment, the cross-sectional shape of the inlet 3 and the outlet 4 is a
quadrangle, but not limited to this, it may be a circular or elliptical shape, and the shape of the
flat speaker 5 may be formed accordingly. Just do it.
[0011]
Each Example which applied this soundproof device 1 to the window glass 18 is described below.
In this case, the sound input from the window glass 18 is the sound input from the entrance 3.
[0012]
Hereinafter, the soundproofing apparatus 10 of Example 1 of this invention is demonstrated
based on FIGS. 1-5.
[0013]
(1) Structure of the Soundproofing Device 10 The soundproofing device 10 has a transparent flat
speaker 20, a noise detection device 22 composed of an acceleration pickup, and a control unit
52 composed of a microcomputer.
As shown in FIGS. 1 and 2, a window 14 is provided on a wall 12 of a room, and a window glass
18 is fitted in a window frame 16 of the window 14. A flat speaker 20 and a noise detection
device 22 are attached to the indoor surface of the window glass 18.
[0014]
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The structure of the transparent flat speaker 20 will be described based on FIG. The flat speaker
20 is joined to eight exciters 28 as vibration generating means for generating vibrations in the
audio frequency band, a flat plate-like transparent diaphragm 30 with high mechanical synthesis,
and the surface 32 of the exciter 28 on the outdoor side. Rubber sponge 34, a synthetic resin
transparent substrate 36 attached to the outdoor side of the rubber sponge 34, and a synthetic
resin frame 38 for holding the periphery of the transparent substrate 36 and the diaphragm 30.
ing. The eight exciters 28 are supported by the transparent substrate 36.
[0015]
The exciter 28 has a drive surface 40 for transmitting vibrations in the audio frequency band to
the diaphragm 30, an outdoor surface 32 to which the rubber sponge 34 is joined, a bobbin 42,
and a coil wound around the bobbin 42. 24, a magnet 26, a yoke 44, and an inner damper 46
connecting the bobbin 42 and the yoke 44.
[0016]
The transparent diaphragm 30 has a driven surface 48 joined to the drive surface 40 of the
exciter 28, and a sound emitting surface 50 for generating an acoustic wave in the medium.
[0017]
The transparent substrate 36 of the transparent flat speaker 20 is attached to the indoor surface
of the window glass 18 via a gap L as shown in FIG.
In this case, by attaching the frame 38 to the window glass 18, the gap L can be maintained.
In Example 1, the body 38 plays the role of the tube of the above-described embodiment, and the
inside of the frame 38 becomes a sound transmission space. Further, by making the frame 38 of
the transparent flat speaker 20 the same size as the window glass 18, as shown in FIG. 2, there is
no feeling that the soundproofing device 10 is attached to the window glass, and Is also suitable.
[0018]
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Two exciters 28 are attached to the upper and lower portions of the window glass 18, and two
exciters 28 are attached to the left and right sides. Although the exciter 28 is attached to the
inside of the frame 38 in FIG. 2, it may be attached to the position of the frame 38. Further, the
attachment position and the attachment number of the exciter 28 are appropriately changed so
that the divided vibration of the diaphragm 30 can be optimally performed.
[0019]
The noise detection device 22 is provided at the upper central portion of the window glass 18.
However, this mounting position may be at another position as long as it is mounted on the
window glass 18.
[0020]
The control unit 52 has an interference wave generation circuit and an amplification circuit. A
vibration wave of noise is input from the noise detection device 22, and a control signal having
the same sound pressure and the same phase as the vibration wave is generated, amplified by an
amplification circuit, and output to each exciter 28 of the flat speaker 20.
[0021]
The operation state of the flat speaker 20 configured as described above will be described. The
drive surface 40 of each exciter 28 to which the control signal is input vibrates, and the
diaphragm 30 also vibrates. In this case, eight exciters 28 are arranged for one diaphragm 30, as
shown in FIG. 2, and the diaphragm 30 is divided and vibrated, and control sound is emitted in a
plane from the sound emission surface 50 of the diaphragm 30. Be done.
[0022]
(2) Control Method of Soundproofing Device 10 Next, a control method of the soundproofing
device 10 will be described based on FIG. When the sound of a train, the running sound of a car,
or other noise is transmitted through the window glass 18, the noise detection device 22 detects
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the vibration wave of the noise. The control unit 52 generates a control signal of a control sound
to be interfered and attenuated with the detected vibration wave and outputs the control signal
to the flat speaker 20. The flat speaker 20 generates a control sound based on the control signal.
The generated control sound is emitted in the form of a plane, and all noise leaking from the
window glass 18 can be attenuated by interference to prevent noise from entering the room.
[0023]
In addition, since the tubular sound transmission space 2 is formed between the window glass 18
and the flat speaker 20 and has a structure for attenuating the noise passing therethrough, it can
be attenuated more reliably. Noise is only transmitted from the outside to the indoor direction in
the sound transmission space, and there is no sound intrusion from the periphery of the sound
transmission space. That is, there is no sound intruding from the frame 38. Therefore, noise can
be attenuated by 10 dB or more.
[0024]
In addition, since this flat speaker 20 has directivity characteristics wider than that of the
conventional cone-type speaker and can sufficiently emit control sound even when the frequency
becomes high, it is possible to cancel high frequency noise. .
[0025]
Further, the noise to be attenuated is a sound that has passed through the window glass 18 once,
and since the window glass itself is considerably attenuated, the soundproof effect can be further
enhanced.
Moreover, since the diaphragm 30 itself performs soundproofing, it has the same structure as the
window glass of the double structure, and the soundproofing can be further enhanced.
[0026]
The gap L between the flat speaker 20 and the window glass 18 plays an even more important
role. This is because, while noise passes through the gap L, the control unit 52 can increase the
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processing time for generating the control sound. When the sound velocity is v, the passage time
of noise t = L / v. For example, when the sound velocity is 344 m / sec at normal temperature
and the gap is 1 cm, t = about 30 μsec. Therefore, it is possible to take 30 μsec until the noise
detection device 22 detects the vibration wave of the noise and the flat speaker 20 generates the
control sound. In Patent Document 2 described above, since the vibration generating element is
directly attached to the window glass, such processing time can not be obtained. The longer the
gap L is, the more processing time can be gained. On the contrary, when the processing time is
shorter than the passing time t, a delay circuit is provided to control the generation time of the
control sound.
[0027]
(4) Modification of First Embodiment In the first embodiment, the noise detection device 22 is
attached to the indoor surface of the window glass 18. Alternatively, the noise detection device
22 may be attached to the outdoor surface of the window glass 18. In this case, since it is
necessary to take into consideration the amount of attenuation attenuated by the window glass
18 with respect to the vibration wave of noise detected by the noise detection device 22, the
vibration wave detected by the noise detection device 22 is passed through a filter circuit. The
control sound is attenuated by the amount of attenuation of the window glass 18 and a control
sound is generated based on the attenuated vibration wave.
[0028]
The soundproofing apparatus 10 of the second embodiment will be described based on FIG. The
difference between the present embodiment and the first embodiment is that the flat speaker 20
and the noise detection device 22 are attached to the surface of the window glass 18 on the
outdoor side. The flat speaker 20 generates a control sound that attenuates the vibration wave of
the noise detected by the noise detection device 22 by interference, and shields the sound
transmitted indoors.
[0029]
As a modification of the second embodiment, it is also possible to attach the noise detection
device 22 to the indoor surface of the window glass 18. In this case, control noise is generated by
adding vibration components of noise attenuated by the window glass 18.
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[0030]
The soundproofing device 10 of the third embodiment will be described based on FIG. The
window glass 18 of the present embodiment has a double structure window glass in which the
first window glass 54 and the second window glass 56 are mounted in parallel with a space 58 to
enhance heat insulation and soundproofing. It is eighteen. The flat speaker 20 is disposed in the
space 58 of the first window glass 54 and the second window glass 56 and attached to the
surface of the second window glass 56 on the outdoor side. Further, the noise detection device
22 is attached to the indoor surface of the first window glass 54.
[0031]
Also in the soundproofing apparatus 10 of this embodiment, the control sound is generated from
the flat speaker 20 so as to attenuate the vibration wave of the noise detected by the noise
detection device 22 attached to the first window glass 54 by interference. Attenuate In addition,
since the window glass 18 has a double structure in this case, the sound insulation can be more
effectively enhanced than the first window glass 18.
[0032]
Also in the soundproof device 10 of the present embodiment, the noise detection device 22 may
be attached to the indoor side of the second window glass 56. The control method in this case is
the same as that of the modification of the second embodiment. Also, the noise detection device
22 may be attached to the outdoor side of the first window glass 54. The control method in this
case is the same as that of the modification of the first embodiment.
[0033]
[Modification] In the above embodiment, an acceleration pickup is used as the noise detection
device 22. However, instead of this, noise may be detected by a microphone.
[0034]
Although the window 14 is provided on the wall 12 in the above embodiment, the window 14
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may be provided on a door instead.
[0035]
In the above embodiment, one flat speaker 20 is attached to the window glass 18 so as to cover
all the window glass 18.
However, when the window glass 18 is large, the flat speakers 20 may be divided into a plurality
of pieces and arranged side by side as shown in FIG.
In this case, the frame 38 may be formed of a transparent synthetic resin in order to make it
inconspicuous.
[0036]
Although the size of the flat speaker 20 attached to the window glass 18 is the same size as the
window glass 18 in the above embodiment, the size of the flat speaker 20 may be smaller than
the size of the window glass 18. Although the noise is radiated from the entire surface of the
window glass 18, the control sound radiated from the flat speaker 20 is also radiated in a planar
manner, so even if the flat speaker 20 is smaller than the window glass 18, the noise is sufficient
Can be attenuated.
[0037]
In the flat speaker 20 of the above embodiment, the plurality of exciters 28 are attached to the
transparent substrate 36, and the transparent diaphragms 30 are attached to the plurality of
exciters 28. The plurality of exciters 28 may be attached directly to the surface via a rubber
sponge 34 and the diaphragm 30 may be attached. Also in this case, a predetermined gap L is
formed between the diaphragm 30 and the window glass 18, and attenuation by control sound
can be performed.
[0038]
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The present invention is suitable as a soundproofing device for windows of houses, apartments,
buildings and the like. Moreover, it is suitable also as a soundproof device of windows, such as a
car, a train, and an airplane.
[0039]
It is a longitudinal cross-sectional view of the soundproofing apparatus which shows Example 1
of this invention. It is the figure which similarly looked at the soundproofing apparatus from the
indoor side. It is a half longitudinal cross-sectional view of a flat speaker similarly. It is a block
diagram of a soundproof device similarly. FIG. 7 is a longitudinal cross-sectional view of the
soundproofing device of Example 2; FIG. 7 is a longitudinal cross-sectional view of the
soundproofing apparatus of the third embodiment. It is a top view of the soundproof device of a
modification.
Explanation of sign
[0040]
DESCRIPTION OF SYMBOLS 10 Soundproof device 14 Window 16 Window frame 18 Window
glass 20 Flat-panel speaker 22 Noise detection apparatus 52 Control part
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