JP2013003393A - Sound masking system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sound masking system favorably used for temporary houses and simple frame houses and capable of reducing a sound influence from the outside while securing a thermal insulation performance.SOLUTION: Sound masking systems 10 and 20 in a room 35 of a building, reduce sound influence on the room 35 from the outside. The sound masking systems 10 and 20 includes: a foam thermal insulation boards 11 and 21 supported to a structural body of the building so as to allow surface vibration; and plane-wave speakers 13 and 23 that are mounted on portions that perform surface vibration out of the foam thermal insulation boards 11 and 21 to emit high-frequency plane wave sound by itself, and cause the foam thermal insulation boards 11 and 21 to perform the surface vibration to generate low-frequency plane wave sound.

Description

  The present invention relates to a sound masking system that reduces the influence of sound from the outside of a room such as a temporary house or a simple house.

  As an apparatus for reducing the influence of ambient sounds, for example, Japanese Patent No. 2986977 (Patent Document 1), Japanese Utility Model Laid-Open No. 5-64894 (Patent Document 2), Japanese Utility Model Laid-Open No. 6-16351 (Patent Document 3), There exist some which were described in the patent 4614534 gazette (patent document 4), the special table 2006-526921 gazette (patent document 5), etc. In addition, a planar speaker is described in Japanese Patent Application Laid-Open No. 2010-288088 (Patent Document 6).

Japanese Patent No. 2986977 Japanese Utility Model Publication No. 5-64894 Japanese Utility Model Publication No. 6-16351 Japanese Patent No. 4614534 Special Table 2006-526921 Publication JP 2010-288088

  By the way, temporary housing installed in the event of an earthquake disaster, and simple housing for forming a simple living room used for civil engineering construction work, for example, may have inferior wall soundproofing performance compared to ordinary housing. Many. Therefore, in a temporary house and a simple house, the sound from the outside is transmitted into the room, and there is a possibility of giving an unpleasant feeling to the resident in the room. Further, in recent years, it has been said that a highly insulated house is a good residential property to improve the comfortability. On the other hand, in the temporary housing and the simple housing, not only the influence of sound but also the heat insulation performance are often inferior as compared with the general housing.

  The present invention has been made in view of such circumstances, and is suitably used for temporary houses and simple houses, and is capable of reducing the influence of external sound while ensuring heat insulation performance. The purpose is to provide.

  The sound masking system of the present invention is a sound masking system that reduces the influence of sound from outside the room in a building, and is a foamable heat insulation board supported on the building structure so as to be capable of surface vibration, A plane wave speaker that is attached to a portion of the foam heat insulation board that vibrates and generates a high-frequency plane wave sound and generates a low-frequency plane wave sound by vibrating the foam heat insulation board. Prepare.

  According to the present invention, a high-frequency plane wave sound can be generated by the plane wave speaker itself, and a low-frequency plane wave sound can be generated by the foam heat insulating board. Therefore, plane wave sound can be generated over a wide frequency range. Further, since the generated sound is a plane wave sound unlike the spherical wave sound generated by the cone speaker, the attenuation rate according to the distance from the generation source is small. Therefore, the difference in loudness can be reduced indoors. That is, it is possible to obtain an appropriate sound volume over a wide range in the room.

  Further, by using a foamable material as the material of the foamable heat insulating board, the board can be reduced in weight. Therefore, the board can be reliably subjected to surface vibration by the plane wave speaker. As a result, low-frequency plane wave sound can be generated by surface vibration of the board. Further, the board is made of a heat insulating material. That is, by providing the board, the heat insulation in the room can be improved. Thus, according to the masking system of the present invention, since it has sound masking properties and heat insulation properties, it is suitably used for temporary housing and simple housing.

  In addition, the sound masking system may include an anti-vibration rubber that elastically supports the foam heat insulating board with respect to the building structure. Anti-vibration rubber makes it difficult for surface vibrations of the foam insulation board to be transmitted to the building structure. Therefore, it is possible to prevent the building structure itself from vibrating. As a result, generation of noise due to vibration of the building structure can be reduced. That is, a desired plane wave sound can be generated indoors by the plane wave speaker and the foam heat insulating board. Furthermore, it is possible to prevent the surface vibration of the foam heat insulating board from affecting the building structure itself. That is, it is possible to prevent adverse effects on the building support function by the building structure.

  In addition, the structure is a surface material that partitions the interior and the exterior of the building, or the interior of the building, and the foamable heat insulating board is disposed to face the surface material, and Arranged between the face material through an air layer, and the anti-vibration rubber is provided over the entire periphery between the face material and the foam heat insulating board, and retains air in the air layer. You may make it make it. Since the air layer between the face material as the structure and the foamable heat insulating board stays, the air layer exhibits a heat insulating effect. Therefore, a heat insulation effect becomes very high by a foamable heat insulation board and the said air layer.

The foamable heat insulating board may be provided on the indoor side of the building. Thereby, a foamable heat insulation board can be attached easily.
The foamable heat insulating board may be an isocyanurate board. Thereby, the above-mentioned effect can be realized with certainty.

It is sectional drawing of the interior of a building. It is AA sectional drawing in sectional drawing inside the room | chamber interior of the building of FIG. It is a figure of the state which rotated the BB expanded sectional view of the plane wave speaker of FIG. 2 90 degrees right.

  The sound masking system of this embodiment is demonstrated with reference to FIGS. The sound masking system is installed on a wall surface, a ceiling, or both in a building such as a temporary house or a simple house. Here, in FIG. 1 and FIG. 2, the case where the sound masking systems 10 and 20 are applied to both the wall surface 31 and the ceiling surface 32 is illustrated. Here, the sound masking systems 10 and 20 reduce the influence of sound from, for example, the outdoors or another adjacent room (outside the room 35) in the room 35 of the building. Specifically, the system generates a plane wave sound in the room 35 so that a person living in the room 35 does not feel uncomfortable the noise generated outside the room 35. That is, the generated plane wave sound cancels out the noise, so that the person in the room does not feel uncomfortable.

  The sound masking systems 10 and 20 are substantially the same in detailed configuration except for the installation location and size. The first sound masking system 10 is a face material that is a structure of a building, and is installed on the indoor 35 side of the wall surface 31 that partitions the outside of the building or the interior of the building. The second sound masking system 20 is a face material that is a building structure, and is installed on the indoor 35 side of the ceiling surface 32 that partitions the outside of the building or the interior of the building. Although not shown, the sound masking system can be installed on the floor 33.

The sound masking systems 10 and 20 include foaming heat insulating boards 11 and 21, anti-vibration rubbers 12 and 22, and plane wave speakers 13 and 23.
The foamable heat insulating boards 11 and 21 are manufactured by foaming a plastic material. For example, isocyanurate boards are used as the foamable heat insulating boards 11 and 21. That is, since the foamable heat insulation boards 11 and 21 are foamed, they are lightweight and exhibit high heat insulation performance. And the 1st foaming heat insulation board 11 is formed in the vertical and horizontal length each slightly shorter than the vertical and horizontal length of the wall surface 31 to install. The first foamable heat insulating board 11 is disposed so as to face the surface of the wall surface 31 on the side of the room 35 and is disposed between the wall surface 31 and the air layer 11 a. Further, the second foamable heat insulating board 21 is formed in a vertical and horizontal length slightly shorter than the vertical and horizontal length of the ceiling surface 32 to be installed. The second foamable heat insulating board 21 is disposed so as to face the surface of the ceiling surface 32 on the indoor 35 side, and is disposed between the ceiling surface 32 and the air layer 21a.

  The anti-vibration rubbers 12 and 22 elastically support the foamable heat insulating boards 11 and 21 with respect to the wall surface 31 or the ceiling surface 32. The anti-vibration rubbers 12 and 22 are provided over the entire periphery between the wall surface 31 or the ceiling surface 32 and the foaming heat insulating boards 11 and 21. That is, the anti-vibration rubbers 12 and 22 are formed in a frame shape. The anti-vibration rubber 12 retains air in the air layer 11 a formed between the wall surface 31 and the foamable heat insulating board 11. Further, the anti-vibration rubber 22 retains air in the air layer 21 a formed between the ceiling surface 32 and the foamable heat insulating board 21.

  Thus, since the edge part of the foamable heat insulation board 11 and 21 is supported by the wall surface 31 or the ceiling surface 32 by the anti-vibration rubbers 12 and 22, the center part of the foamable heat insulation board 11 and 21 can be surface-vibrated. It is supposed to be in a state. The foam heat insulating boards 11 and 21 are subjected to surface vibration by driving plane wave speakers 13 and 23 described later.

  The plane wave speakers 13 and 23 are actuators that generate plane wave sound. Here, the plane wave sound is different from the spherical wave sound generated by the cone speaker. The spherical wave sound is transmitted radially from the point-like generation source, whereas the plane wave sound is transmitted from the planar sound generation source in the surface normal direction. As the plane wave speakers 13 and 23, for example, a hybrid system speaker “FPS0105 HY-02” manufactured by FP Corporation is applied.

  The plane wave speakers 13 and 23 are attached to portions of the foamable heat insulating boards 11 and 21 that are subject to surface vibration, in this case, at the center of the foamable heat insulating boards 11 and 21. In particular, in this embodiment, the plane wave speakers 13 and 23 are attached to the air layers 11a and 21a side of the foam heat insulating boards 11 and 21. However, the plane wave speakers 13 and 23 can also be attached to the room 35 side of the foamable heat insulating boards 11 and 21.

  The plane wave speakers 13 and 23 themselves generate high-frequency plane wave sounds. Furthermore, when the plane wave speakers 13 and 23 cause the foaming heat insulation boards 11 and 21 to vibrate, the foam insulation boards 11 and 21 generate low frequency plane wave sounds. That is, the plane wave speakers 13 and 23 directly generate a high-frequency plane wave sound and indirectly generate a low-frequency plane wave sound.

  The structure of the plane wave speakers 13 and 23 will be described with reference to FIG. As shown in FIG. 3, the plane wave speakers 13 and 23 include a frame 51, a diaphragm 52, a magnet 53, a voice coil 54, a yoke 55, an elastic member 56, an iron plate 57, and a nonwoven fabric 58. .

  The frame 51 is formed in a hat-shaped cross section by pressing a steel or aluminum alloy plate. In other words, the frame 51 includes a U-shaped protruding portion 51a and a flange portion 51b projecting outward from the end portion. An oval opening 51c is formed on the protruding end surface (upper surface in FIG. 3) of the U-shaped protruding portion 51a of the frame 51. And the flange part 51b of the flame | frame 51 is fixed to the foamable heat insulation board 11 and 21. FIG.

  The diaphragm 52 is fixed to the frame 51 so as to close the opening 51 c from the inside of the frame 51. Similar to the frame 51, the diaphragm 52 is formed of a steel material or an aluminum alloy. The diaphragm 52 is capable of surface vibration with respect to the frame 51. When the diaphragm 52 undergoes surface vibration, high-frequency plane wave sound is generated.

  A plurality of magnets 53 are arranged, for example, in a row inside the frame 51, and the magnetic poles S or N are arranged so as to face the inner surface of the diaphragm 52. Further, the adjacent magnets 53 are arranged such that their magnetic poles are opposite to each other.

  The voice coil 54 is fixed by adhering to the surface (inner surface) of the diaphragm 52 facing the magnet 53. Specifically, the voice coil 54 is arranged in the diaphragm 52 so that the voice coil 54 is arranged along the arrangement direction of the magnets 53 and is opposed to the magnet 53 whose south pole is facing the diaphragm 52 side. It is provided on the side. That is, the voice coil 54 is provided to face every other magnet 53. As this voice coil 54, for example, a winding coil 54a wound around a bobbin 54b is preferably used. In addition, the voice coil 54 may be an air-core coil without a bobbin.

  The yoke 55 is formed in a U-shape and is disposed so as to accommodate the surface of the magnet 53 that does not face the diaphragm 52. An iron plate 57 is interposed between the bottom surface of the yoke 55 and the surface of the magnet 53 that does not oppose the diaphragm 52 in a state of being bonded to both. That is, the iron plate 57 and the yoke 55 constitute a magnetic circuit.

  The elastic member 56 is interposed between the yoke 55 and the foamable heat insulating boards 11 and 21 as substrates. Further, a nonwoven fabric 58 is provided between the yoke 55 and the voice coil 54 and between the magnet 53 and the voice coil 54 so that the magnet 53 does not contact the voice coil 54 when the magnet 53 and the diaphragm 52 vibrate. Is arranged.

  The plane wave speakers 13 and 23 configured as described above operate as follows. When a control signal is input to the voice coil 54, a fluctuating magnetic field is generated in the voice coil 54. This fluctuating magnetic field interacts with the magnetic field of the magnet 53, and the diaphragm 52 undergoes surface vibration. Since the magnet 53 is attached to the foamable heat insulating boards 11 and 21 via the elastic member 56, the magnet 53 vibrates simultaneously with the vibration of the diaphragm 52.

  The high-frequency surface vibration of the diaphragm 52 is directly transmitted in the surface normal direction. That is, high-frequency plane wave sound is generated by the surface vibration of the diaphragm 52 itself. On the other hand, low-frequency surface vibration of the diaphragm 52 is transmitted to the foamable heat insulating boards 11 and 21 through the frame 51, and is transmitted to the room 35 by the surface vibration of the foamable heat insulating boards 11 and 21. That is, the low-frequency surface vibration of the diaphragm 52 causes the low-frequency surface vibration of the foam heat insulating boards 11 and 21 to generate a low-frequency plane wave sound.

  Further, the high frequency vibration of the magnet 53 is absorbed by the elastic member 56 and is not transmitted to the foamable heat insulating boards 11 and 21. On the other hand, the low-frequency vibration of the magnet 53 is transmitted to the foamable heat insulation boards 11 and 21 through the elastic member 56, and the foamable heat insulation boards 11 and 21 are subjected to surface vibration to generate a low-frequency plane wave sound. That is, the foamable heat insulating boards 11 and 21 generate a low-frequency plane wave sound due to the surface vibration of the diaphragm 52 and the vibration of the magnet 53.

  As described above, the plane wave speakers 13 and 23 themselves can generate a high-frequency plane wave sound, and the foamed heat insulating boards 11 and 21 can generate a low-frequency plane wave sound. Therefore, plane wave sound can be generated over a wide frequency range. Further, since the generated sound is a plane wave sound unlike the spherical wave sound generated by the cone speaker, the attenuation rate according to the distance from the generation source is small. For this reason, the difference in loudness in the room 35 can be reduced. That is, an appropriate sound volume can be obtained in a wide range of the room 35.

  Further, by using a foamable material for the foamable heat insulating boards 11 and 21, the weight of the foamable heat insulating boards 11 and 21 can be reduced. Therefore, the foamable heat insulating boards 11 and 21 can be surely surface-vibrated by the plane wave speakers 13 and 23. As a result, low-frequency plane wave sound can be generated by the surface vibration of the foamable heat insulating boards 11 and 21. Furthermore, the foamable heat insulating boards 11 and 21 are made of a heat insulating material. That is, by providing the foamable heat insulating boards 11 and 21, the heat insulating property of the room 35 can be enhanced. Thus, since it has sound masking property and heat insulation, it is suitably used for temporary housing and simple housing.

  Further, the foam heat insulating boards 11 and 21 are elastically supported by the vibration isolating rubbers 12 and 22 with respect to the wall surface 31 or the ceiling surface 32. The vibration isolation rubbers 12 and 22 make it difficult for the surface vibration of the foam heat insulating boards 11 and 21 to be transmitted to the wall surface 31 or the ceiling surface 32. Therefore, the wall surface 31 or the ceiling surface 32 itself can be prevented from vibrating. As a result, generation of noise due to vibration of the building structure can be reduced. That is, a desired plane wave sound can be generated in the room 35 by the plane wave speakers 13 and 23 and the foaming heat insulating boards 11 and 21. Furthermore, it is possible to prevent the surface vibration of the foamable heat insulating boards 11 and 21 from affecting the wall surface 31 or the ceiling surface 32. That is, it is possible to prevent adverse effects on the building support function by the building structure.

  In addition, air layers 11 a and 21 a are formed between the foamable heat insulation boards 11 and 21 and the wall surface 31 or the ceiling surface 32, and the anti-vibration rubbers 12 and 22 are disposed on the entire periphery of the foam heat insulation boards 11 and 21. The air in the air layers 11a and 21a is retained. That is, the air layer exhibits a heat insulating effect. Therefore, a double heat insulating effect is exhibited by the foamable heat insulating boards 11 and 21 and the air layers 11a and 21a. The foamable heat insulating boards 11 and 21 are provided on the indoor 35 side. Therefore, the foamable heat insulating boards 11 and 21 can be attached very easily.

  In addition to the above, the sound masking system 20 provided on the ceiling surface 32 can exert a masking effect on the floor impact sound on the second floor. In particular, since the entire ceiling surface 32 vibrates, even if the number of installed plane wave speakers 23 as an actuator is small, the masking effect is surely exhibited regardless of the floor impact occurrence location on the second floor.

DESCRIPTION OF SYMBOLS 10,20: Sound masking system, 11,21: Foaming heat insulation board 11a, 21a: Air layer, 12,22: Anti-vibration rubber, 13,23: Plane wave speaker 31: Wall surface, 32: Ceiling surface, 33: Floor surface 35: indoor 51: frame, 52: diaphragm, 53: magnet, 54: voice coil 55: yoke, 56: elastic member, 57: iron plate, 58: non-woven fabric

Claims (5)

A sound masking system that reduces the influence of sound from outside the room in the building,
A foam heat insulating board supported by the structure of the building so as to be capable of surface vibration;
A plane wave speaker that is attached to the surface vibration portion of the foam heat insulation board, and generates a high frequency plane wave sound, and generates a low frequency plane wave sound by surface vibration of the foam heat insulation board;
Sound masking system with In claim 1,
The sound masking system includes an anti-vibration rubber that elastically supports the foam heat insulating board with respect to the building structure. In claim 1 or 2,
The structure is a surface material that partitions the interior and the exterior of the building, or the interior of the building,
The foamable heat insulating board is disposed to face the face material, and is disposed between the face material and an air layer,
The anti-vibration rubber is provided over the entire periphery between the face material and the foamable heat insulating board, and is a sound masking system that retains air in the air layer. In any one of Claims 1-3,
The foam insulation board is a sound masking system provided on the indoor side of the building. In any one of Claims 1-4,
The foaming insulation board is a sound masking system, which is an isocyanurate board.

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