JP4120649B2 - Soundproofing device - Google Patents

Description

  The present invention relates to a soundproofing device.

As the soundproofing structure of the window, soundproofing is performed by making the window glass into a double structure or thickening. However, since this is not sufficient, conventionally the following soundproofing devices have been proposed. Outdoor noise is detected by a microphone, and control sounds are generated from speakers provided at the upper and lower portions of the indoor window frame so as to be interference waves that cancel the detected noise (see Patent Document 1). Moreover, it consists of the microphone which detects noise, and the vibration generator which vibrates a window glass, a vibration generator is vibrated so that the noise detected by the microphone may be canceled, and noise is attenuated (refer patent document 2).
JP-A-8-305372 JP-A-8-314471

  In the above soundproofing device of Patent Document 1, speakers are attached to the upper and lower portions of the window frame to generate control sounds, but the sound leaking from the entire window glass is canceled by the sound generated from these speakers. It is difficult. Further, with 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 is more uncomfortable. Noise is generated. In view of the above problems, the present invention provides a soundproofing device that can be easily attached to a windowglass and can completely prevent sound leaking from the windowglass.

The present invention is a soundproofing device that is attached to a window glass, and is a flat speaker that is attached to an indoor side surface of the window glass, and is arranged on the indoor side surface or the outdoor side surface of the window glass, and It possesses a vibration wave detecting means for detecting a wave, and a control means for generating from said planar speaker control sound attenuating interfering between the detected vibration wave by the vibration wave detecting unit, wherein the flat speaker is a flat plate Transparent diaphragm, transparent substrate, peripheral edge of the transparent substrate and a frame body holding the peripheral edge of the diaphragm, supported by the transparent substrate, and in contact with the back side of the diaphragm, respectively A plurality of vibration generating members arranged, and each of the plurality of vibration generating members is disposed so that the diaphragm can perform divided vibration .

With the soundproofing device of the present invention, it is possible to perform soundproofing by generating a control sound that interferes with and attenuates the vibration wave corresponding to the noise detected by the vibration wave detecting means from the flat speaker. In this case, since sound is generated from a flat speaker mounted on a plane with respect to the window glass, noise leaking from the window glass can be completely attenuated. Further, since the diaphragm and the transparent substrate of the flat speaker are transparent, there is no sense of incongruity even if they are attached to a window glass.

  Hereinafter, a soundproof device 1 according to an embodiment of the present invention will be described with reference to FIG. As shown in FIG. 8, the soundproofing device 1 attenuates the sound input from the inlet 3 of the tube having a quadrangular cross section. It is assumed that sound is input only from the inlet 3 which is one end of the sound transmission space in the tube 2 and is not input from the periphery of the tube 2.

  A flat speaker 5 is attached to the outlet 4 at the other end of the tube 2. The flat speaker 5 is mounted in a plane so as to be orthogonal to the transmission direction so as to shield all the outlets 4 of the tube 2. The entrance 3 is provided with a vibration wave detection device 6 that detects a vibration wave of the input sound. For example, an acceleration pickup or a microphone is used as the vibration wave detection device 6. A control device 7 composed of 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 outputs the control sound of the opposite phase and the same sound pressure from the flat speaker 5 so as to attenuate the vibration wave. Output in a planar shape.

  When the distance (sound transmission distance) from the inlet 3 to the outlet 4 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 the vibration wave and output the control sound. The processing time t = L / v. Where v is the speed of sound.

  In the soundproofing device 1 of the present embodiment, the sound input from the inlet 3 of the 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.

  In the above embodiment, the cross-sectional shapes of the inlet 3 and the outlet 4 are square, but the shape is not limited to this, and may be a circle or an ellipse. That's fine.

  Examples in which the soundproofing device 1 is applied to the window glass 18 will be described below. In this case, the sound input from the window glass 18 is the sound input from the entrance 3.

  Hereinafter, the soundproofing apparatus 10 of Example 1 of this invention is demonstrated based on FIGS.

(1) Structure of the soundproofing device 10 The soundproofing device 10 has a transparent flat speaker 20, a noise detecting device 22 made of an acceleration pickup, and a control unit 52 made of a microcomputer. As shown in FIGS. 1 and 2, a window 14 is provided on the wall 12 of the 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 side surface of the window glass 18.

  The structure of the transparent flat speaker 20 will be described with reference to FIG. The flat speaker 20 is bonded to eight exciters 28 which are vibration generating means for generating vibrations in an audible frequency band, a flat plate-shaped transparent diaphragm 30 with high mechanical synthesis, and a surface 32 on the outdoor side of the exciter 28. A 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 that holds the periphery of the transparent substrate 36 and the diaphragm 30. ing. The eight exciters 28 are supported by the transparent substrate 36.

  The exciter 28 includes a drive surface 40 that transmits vibrations in the audible frequency band to the diaphragm 30, an outdoor surface 32 to which a 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 that couples the bobbin 42 and the yoke 44.

  The transparent diaphragm 30 has a driven surface 48 joined to the driving surface 40 of the exciter 28 and a sound emitting surface 50 that generates sound waves in the medium.

  The transparent substrate 36 of the transparent flat speaker 20 is attached to the indoor side surface of the window glass 18 through a gap L as shown in FIG. In this case, the gap L can be maintained by attaching the frame body 38 to the window glass 18. In Example 1, the pure body 38 serves as a tube of the above-described embodiment, and the inside of the frame body 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. Is also suitable.

  Two exciters 28 are attached to the upper and lower portions of the window glass 18 and two to the left and right sides. The exciter 28 is attached to the inside of the frame 38 in FIG. 2, but may be attached to the position of the frame 38. Further, the mounting position and the number of mounting of the exciter 28 are appropriately changed so that the divided vibration of the diaphragm 30 can be optimally performed.

  The noise detection device 22 is provided in the upper center portion of the window glass 18. However, this attachment position may be another position as long as it is attached to the window glass 18.

  The control unit 52 includes an interference wave generation circuit and an amplification circuit. A noise vibration wave is input from the noise detector 22, a control signal having the same phase as that of the vibration wave and the same sound pressure is generated, amplified by an amplifier circuit, and output to each exciter 28 of the flat speaker 20.

  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, as shown in FIG. 2, eight exciters 28 are arranged for one diaphragm 30, and the diaphragm 30 is divided and radiated from the sound emitting surface 50 of the diaphragm 30 in a planar shape. Is done.

(2) Control Method of Soundproof Device 10 Next, a control method of the soundproof device 10 will be described based on FIG. When train noise, automobile running noise, or other noise is transmitted through the window glass 18, the noise detector 22 detects the vibration wave of the noise. The control unit 52 generates a control signal of a control sound that interferes and attenuates 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 a planar shape, all the noise leaking from the window glass 18 is attenuated by interference, and noise can be prevented from entering the room.

  Moreover, since the tubular sound transmission space 2 is formed between the window glass 18 and the flat speaker 20 and the structure is configured to attenuate noise passing therethrough, it can be more reliably attenuated. Noise is only transmitted from the outside to the indoor direction in the sound transmission space, and there is no sound intrusion from around the sound transmission space. That is, there is no sound entering from the frame 38. Therefore, noise can be attenuated by 10 dB or more.

  Further, the flat speaker 20 has a wider directivity than the conventional cone type speaker, and can sufficiently emit a control sound even when the frequency becomes high, so that high frequency noise can be canceled. .

  Further, the noise to be attenuated is sound that has once passed through the window glass 18 and is considerably attenuated by the window glass itself, so that the soundproofing effect can be further enhanced. Moreover, since the diaphragm 30 itself also performs soundproofing, it has the same structure as a double-glazed window glass, and soundproofing can be further enhanced.

  The gap L between the flat speaker 20 and the window glass 18 plays an even more important role. This is because, during the passage of noise through the gap L, the control unit 52 can earn processing time for generating the control sound. When the sound speed is v, the noise passing time t = L / v. For example, when the sound speed is 344 m / sec at normal temperature and the gap is 1 cm, t = about 30 μsec. Therefore, it can take 30 μs 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 demonstrated above, since the vibration generating element is directly attached to the window glass, such a processing time cannot be earned. Note that the longer the gap L, the longer the processing time. Conversely, when the processing time is shorter than the passage time t, a delay circuit is provided to control the generation time of the control sound.

(4) Modification of Example 1 In Example 1, the noise detection device 22 is attached to the indoor side surface of the window glass 18, but it may be attached to the outdoor side surface of the window glass 18 instead. In this case, since it is necessary to consider the attenuation attenuated by the window glass 18 with respect to the vibration wave of the 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 window glass 18 is attenuated by the attenuation amount, and a control sound is generated based on the attenuated vibration wave.

  The soundproofing device 10 according to the second embodiment will be described with reference to 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. A control sound for attenuating the vibration wave of the noise detected by the noise detection device 22 by interference is generated by the flat speaker 20 to block the sound transmitted indoors.

  As a modification of the second embodiment, the noise detection device 22 can be attached to the indoor side surface of the window glass 18. In this case, a control sound is generated by adding a vibration amount of noise attenuated by the window glass 18.

  The soundproofing device 10 according to the third embodiment will be described with reference to FIG. The window glass 18 of the present embodiment has a double-structured window glass in which the first window glass 54 and the second window glass 56 are mounted in parallel and with a space 58 in order to enhance the heat insulation and soundproofing effects. 18. The flat speaker 20 is in a space 58 between the first window glass 54 and the second window glass 56 and is attached to the surface of the second window glass 56 on the outdoor side. The noise detection device 22 is attached to the indoor side surface of the first window glass 54.

  Also in the soundproofing device 10 of this embodiment, a control sound is generated from the flat speaker 20 so that the vibration wave of the noise detected by the noise detecting device 22 attached to the first window glass 54 is attenuated by interference, and the noise is reduced. Is attenuated. Moreover, since it is the window glass 18 of a double structure in this case, soundproofing can be improved more effectively than the 1st window glass 18. FIG.

  In the soundproofing 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 the modified example of the second embodiment. Moreover, you may attach the noise detection apparatus 22 to the outdoor side of the 1st window glass 54. FIG. The control method in this case is the same as the modified example of the first embodiment.

[Example of change]
In the above-described embodiment, an acceleration pickup is used as the noise detection device 22. However, instead of this, noise may be detected by a microphone.

  In the above embodiment, the window 14 is provided on the wall 12, but the window 14 may be provided on the door instead.

  In the above embodiment, one flat speaker 20 is attached to the window glass 18 so as to cover the entire window glass 18. However, when the window glass 18 is large, the planar speaker 20 may be divided into a plurality of sheets and attached as shown in FIG. In this case, the frame body 38 may be formed of a transparent synthetic resin so as not to stand out.

  In the said Example, although the magnitude | size of the flat speaker 20 attached to the window glass 18 was the same magnitude | size as this window glass 18, you may make the magnitude | size of the flat speaker 20 smaller than the window glass 18. FIG. Although noise is radiated from the entire surface of the window glass 18, since the control sound radiated from the flat speaker 20 is also radiated in a planar manner, even if the flat speaker 20 is smaller than the window glass 18, the noise is sufficient. Can be attenuated.

  In the flat speaker 20 of the above embodiment, a plurality of exciters 28 are attached to the transparent substrate 36, and the transparent diaphragm 30 is attached to the plurality of exciters 28. Instead, the plurality of exciters 28 are attached to the window glass 18. The vibration plate 30 may be attached to the plurality of exciters 28 by directly attaching to the surface via the rubber sponge 34. Even in this case, a predetermined gap L is formed between the diaphragm 30 and the window glass 18, and attenuation by the control sound can be performed.

  The present invention is suitable as a soundproofing device for windows of houses, apartments, buildings, and the like. It is also suitable as a soundproofing device for windows of cars, trains and airplanes.

It is a longitudinal cross-sectional view of the soundproofing device which shows Example 1 of this invention. Similarly, it is the figure which looked at the soundproofing device from the indoor side. It is a semi-longitudinal sectional view of a flat speaker. It is a block diagram of a soundproofing device similarly. It is a longitudinal cross-sectional view of the soundproofing device of Example 2. It is a longitudinal cross-sectional view of the soundproofing device of Example 3. It is a top view of the soundproofing device of the example of a change. It is a perspective view of the soundproofing device which shows one embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Soundproofing device 14 Window 16 Window frame 18 Window glass 20 Planar speaker 22 Noise detection apparatus 52 Control part

Claims (16)

A soundproofing device attached to the window glass,
A flat speaker attached to the indoor side surface of the window glass;
Vibration wave detection means arranged on the indoor side surface or the outdoor side surface of the window glass, and detects a vibration wave of sound;
Control means for generating a control sound from the planar speaker that interferes with and attenuates the vibration wave detected by the vibration wave detection means;
I have a,
The flat speaker is a flat transparent diaphragm, a transparent substrate, a frame holding the periphery of the transparent substrate and the periphery of the diaphragm, supported by the transparent substrate, and the back surface of the diaphragm A plurality of vibration generating members arranged in contact with the side,
The soundproofing device according to claim 1, wherein the plurality of vibration generating members are arranged so that the diaphragm can perform divided vibration . The vibration wave detecting means is attached to the indoor side surface of the window glass,
The control means includes
2. The soundproofing device according to claim 1, wherein the control sound is generated to interfere with and attenuate the vibration wave detected by the vibration wave detecting means. The vibration wave detecting means is attached to the outdoor side surface of the window glass,
The control means includes
Control sound generation means for subtracting the attenuation due to the window glass from the vibration wave detected by the vibration wave detection means and generating the control sound so as to interfere with the attenuated vibration wave. The soundproofing device according to claim 1. A soundproofing device attached to the window glass,
A flat speaker attached to the outdoor surface of the window glass;
Vibration wave detection means arranged on the outdoor side surface or the indoor side surface of the window glass, and detects a vibration wave of sound,
Control means for generating a control sound from the planar speaker that interferes with and attenuates the vibration wave detected by the vibration wave detection means;
I have a,
The flat speaker is a flat transparent diaphragm, a transparent substrate, a frame holding the periphery of the transparent substrate and the periphery of the diaphragm, supported by the transparent substrate, and the back surface of the diaphragm A plurality of vibration generating members arranged in contact with the side,
The soundproofing device according to claim 1, wherein the plurality of vibration generating members are arranged so that the diaphragm can perform divided vibration . The vibration wave detecting means is attached to the outdoor side surface of the window glass,
5. The soundproofing device according to claim 4, wherein the control means generates the control sound that interferes with and attenuates the vibration wave detected by the vibration wave detection means. The vibration wave detecting means is attached to the indoor side surface of the window glass,
5. The soundproofing device according to claim 4, wherein the control means generates the control sound by adding an attenuation amount of a vibration wave absorbed by the window glass. A soundproofing device attached to the window glass,
The window glass has a double structure in which two sheets are stacked,
A flat speaker attached to a space between the two window panes,
A vibration wave detecting means for detecting a vibration wave of sound, arranged between the window glass stacked on the two sheets, the indoor side surface of the window glass stacked on the two sheets, or the outdoor side surface;
Control means for generating a control sound from the planar speaker that interferes with and attenuates the vibration wave detected by the vibration wave detection means;
Yes, and
The flat speaker is a flat transparent diaphragm, a transparent substrate, a frame holding the periphery of the transparent substrate and the periphery of the diaphragm, supported by the transparent substrate, and the back surface of the diaphragm A plurality of vibration generating members arranged in contact with the side,
The soundproofing device according to claim 1, wherein the plurality of vibration generating members are arranged so that the diaphragm can perform divided vibration . The vibration wave detecting means is attached to the space between the two window panes,
8. The soundproofing device according to claim 7, wherein the control means generates the control sound that interferes with and attenuates the vibration wave detected by the vibration wave detection means. The vibration wave detecting means is attached to the surface on the outdoor side of the window glass overlaid on the two sheets,
The control means includes
A filter circuit for subtracting the attenuation due to one window glass on the outdoor side from among the two glazing windows laminated from the vibration wave detected by the vibration wave detecting means;
8. The soundproofing device according to claim 7, further comprising control sound generating means for generating the control sound so as to interfere with the vibration wave attenuated by the filter circuit. The vibration wave detecting means is attached to the indoor side surface of the window glass overlaid on the two sheets,
8. The soundproofing device according to claim 7, wherein the control means generates the control sound by subtracting an attenuation amount of a vibration wave absorbed by the window glass laminated on the two sheets. The size of the flat speaker is, soundproofing apparatus according to at least one item among the claims 1 to 10, characterized in that the same size as the window glass. The size of the flat speaker is, soundproofing apparatus according to at least one item among the claims 1 to 10, wherein the smaller than the window glass. Wherein the flat speaker is a plurality lined magnitude, soundproofing apparatus according to at least one item among the claims 1 to 10, characterized in that the same size as the window glass. The soundproof device according to at least one of claims 1 to 13 , wherein the vibration wave detecting means is a microphone or an acceleration pickup. The planar speaker and the window glass is mounted with a predetermined gap L, at least one among claims 14 claim 1, wherein the gap is characterized in that it is surrounded by a frame body of the flat speaker The soundproofing device according to item. The processing time t from when the control means detects the vibration wave by the vibration wave detection means until the control sound is output by the planar speaker is t, and when the sound speed is v, t = L / v. The soundproofing device according to at least one of claims 1 to 15 , wherein

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