JP6216122B2 - Sound absorber - Google Patents

Description

  The present invention relates to a sound absorber, and more particularly, to a sound absorber that absorbs sound generated in a soundproof room (hereinafter sometimes simply referred to as a “room”).

  Conventionally, a sound room or an audio room for playing musical instruments or watching movies has a soundproof structure for preventing leakage of sound generated indoors as a soundproof room, and musicians and listeners of musical instruments in the room From the viewpoint of improving the sound to be felt, in order to remove the standing waves that accumulate in the corners of the room and to properly resonate the sound in the room, a part of the range of the sound generated in the room and the sound reflected from the wall is reduced. Some have a sound absorbing structure for absorbing, that is, absorbing the sound of the chamber. Conventionally, a sound absorbing panel or a sound absorbing material has been used as the sound absorbing structure of the chamber.

  Techniques relating to the absorption of sound generated in the room are disclosed in Japanese Utility Model Publication No. 62-42607 (Patent Document 1) and Japanese Patent Application Laid-Open No. 2007-286387 (Patent Document 2). According to the sound room disclosed in Patent Document 1, over the entire circumference of the abutting portion between the room wall surface and the ceiling surface, the two surfaces are along the wall surface and the ceiling surface, respectively, and the cross section is approximately 3 so that one surface faces obliquely downward in the room. An angular bass absorber is arranged. The bass absorber effectively absorbs bass. According to Patent Document 2, from the viewpoint of improving acoustic characteristics, a positioning unit that is installed at a boundary portion surrounded by a structural surface in which two or three directions constitute a structural body is in contact with these structural surfaces is provided. In addition, in the state where the positioning portion is in contact with the structural surface and the positioning is performed, the acoustic improvement member having an inclined surface with an inclined portion with respect to the structural surface in two or three directions is used. The sound inside the structure is improved by reflection or absorption of sound on the inclined surface of the improvement member.

Japanese Utility Model Publication Sho 62-42607 JP 2007-286387 A

  Here, even with the above-described bass absorber disclosed in Patent Document 1 and the sound improvement member disclosed in Patent Document 2, sound absorption in the room cannot be performed appropriately, and as a result, a musical instrument player, etc. There were cases where I felt dissatisfied with the sound that I felt. That is, in Patent Document 1, only low sounds are absorbed, and high sounds cannot be absorbed. Also in Patent Document 2, since the sound improving member has a structure having an inclined surface, sound absorption by the inclined surface itself may be insufficient. As a result, for a player who plays a musical instrument in a room, the sound produced by the musical instrument he / she played does not reach the performer's ears properly, and there is an unsatisfactory sound absorbing structure in the room.

  An object of this invention is to provide the sound absorber which can absorb a sound more appropriately indoors.

  A sound absorber according to an embodiment of the present invention is a sound absorber that absorbs indoor sound, and has a portion whose thickness varies from the sound absorbing surface that absorbs indoor sound toward the depth direction. A plurality of layered members are laminated in the direction.

  According to such a sound absorber, since there is a portion where the thickness is different in the depth direction from the sound absorbing surface that absorbs the sound, the wavelength of the sound entering from the sound absorbing surface side exposed in the room is relatively thick. A sound in a short bass region can be efficiently absorbed, and a sound in a treble region having a long wavelength can be efficiently absorbed in both a relatively thick part and a relatively thin part. That is, it is possible to efficiently absorb sound over a wide range from the high sound region to the low sound region. In this case, since the sound absorber is formed by laminating a plurality of layered members from the sound absorbing surface toward the depth direction, the sound absorbing member cannot be absorbed by the layered member located on the sound absorbing surface side, and passes through the layered member on the sound absorbing surface side. Even if it is the sound which was performed, the sound permeate | transmitted by the other layered member located in the depth direction can be absorbed. Therefore, more appropriate indoor sound absorption can be performed.

  Moreover, you may comprise each layered member so that it may be comprised with the nonwoven fabric. By comprising in this way, by comprising in this way, more suitable sound absorption by a nonwoven fabric and reflection of a sound can be performed.

  In another aspect of the present invention, the sound absorber is a sound absorber that absorbs indoor sound, and has a portion whose thickness varies in the depth direction from the sound absorbing surface that absorbs the sound, and has an octave band center frequency of 125 Hz. The sound absorption coefficient of the band is 0.5 or more, and the sound absorption coefficient of the octave band center frequency 500 Hz band is 0.8 to 1.0.

  According to such a sound absorber, since there is a portion where the thickness is different in the depth direction from the sound absorbing surface that absorbs the sound, the wavelength of the sound entering from the sound absorbing surface side exposed in the room is relatively thick. A sound in a short bass region can be efficiently absorbed, and a sound in a treble region having a long wavelength can be efficiently absorbed in both a relatively thick part and a relatively thin part. That is, it is possible to efficiently absorb sound over a wide range from the high sound region to the low sound region. In this case, the sound absorption coefficient of the sound absorber in the octave band center frequency 125 Hz band is 0.5 or more, and the sound absorption coefficient in the octave band center frequency 500 Hz band of the sound absorber is 0.8 to 1.0. Appropriate sound can be obtained. Therefore, more appropriate indoor sound absorption can be performed.

  In still another aspect of the present invention, the sound absorber is a sound absorber that absorbs indoor sound, and includes an exposed area variable mechanism that varies the exposed area of the sound absorbing surface exposed to the room.

  According to such a sound absorber, since there is a portion where the thickness is different in the depth direction from the sound absorbing surface that absorbs the sound, the wavelength of the sound entering from the sound absorbing surface side exposed in the room is relatively thick. A sound in a short bass region can be efficiently absorbed, and a sound in a treble region having a long wavelength can be efficiently absorbed in both a relatively thick part and a relatively thin part. That is, it is possible to efficiently absorb sound over a wide range from the high sound region to the low sound region. In this case, since the exposure area varying mechanism that varies the exposed area of the sound absorbing surface exposed to the room is included, the exposed area of the sound absorbing surface of the sound absorbing body in the soundproof room can be made variable. Then, the degree of sound absorption in the sound absorber can be changed, and the acoustic time in the soundproof room can be adjusted. Therefore, for example, it becomes easy for the performer performing in the soundproof room to make the sound in the soundproof room more appropriate.

  Moreover, you may comprise an exposure area variable mechanism so that the door part which makes the area which covers a sound absorption surface variable is provided. By comprising in this way, the exposed area of a sound absorption surface can be easily made variable by opening and closing of a door part.

  Further, the exposed area variable mechanism may include a screen member that arbitrarily changes the exposed area from the opening to the closing of the sound absorbing surface. By configuring in this way, the exposed area of the sound absorbing surface can be adjusted more finely by configuring in this way.

  Moreover, you may comprise so that it may have a 1st part whose depth dimension is 23 cm or more, and a 2nd part whose depth dimension is less than 23 cm. With this configuration, the first part can reliably absorb the low sound region, and both the first part and the second part can reliably absorb the high sound region. Therefore, sound absorption in the room can be performed more appropriately.

  And a depth dimension maximum region where the depth dimension from the sound absorbing surface is maximum, and a depth dimension increasing region located adjacent to the depth dimension maximum region and increasing as the depth dimension from the sound absorbing surface approaches the maximum. It may be configured. By comprising in this way, a sound can be absorbed efficiently continuously from a low sound area to a high sound area.

  Moreover, you may comprise so that it may be a substantially triangular prism shape. By comprising in this way, the space in the room | chamber interior at the time of attaching a sound absorber to a room | chamber interior can be utilized more effectively.

  Moreover, you may comprise so that the attachment or detachment mechanism which can be attached or detached to a chamber is provided. With this configuration, the sound absorber can be easily attached to and detached from the soundproof room.

  Since the sound absorbing surface that absorbs the sound has a portion with a different thickness in the depth direction, the sound that enters the sound absorbing surface exposed in the room is efficiently used in the low-frequency region with a short wavelength at the relatively thick portion. Therefore, it is possible to efficiently absorb a sound in a high frequency region having a long wavelength in both a relatively thick part and a relatively thin part. That is, it is possible to efficiently absorb sound over a wide range from the high sound region to the low sound region. In this case, since the sound absorber is formed by laminating a plurality of layered members from the sound absorbing surface toward the depth direction, the sound absorbing member cannot be absorbed by the layered member located on the sound absorbing surface side, and passes through the layered member on the sound absorbing surface side. Even if it is the sound which was performed, the sound permeate | transmitted by the other layered member located in the depth direction can be absorbed. Therefore, more appropriate indoor sound absorption can be performed.

It is a perspective view which shows the external appearance of the sound absorber which concerns on one Embodiment of this invention. It is the figure which looked at the sound-absorbing body shown in FIG. 1 from the direction of arrow II in FIG. It is the figure which looked at the sound-absorbing body shown in FIG. 1 from the direction of arrow III in FIGS. It is the figure which looked at the sound-absorbing body shown in FIG. 1 from the direction opposite to the direction of arrow III in FIGS. It is the figure which looked at the sound-absorbing body shown in FIG. 1 from the direction of arrow V in FIG. It is the figure which looked at the sound-absorbing body shown in FIG. 1 from the direction of arrow II in FIG. It is the disassembled perspective view which decomposed | disassembled the sound-absorbing body formed from a some layered member in the unit of a layered member. It is a schematic sectional drawing which shows one of the layered members which form a sound absorber. It is sectional drawing which shows a part of intermediate member in the manufacturing process in an example of the manufacturing method of a sound absorber. It is a schematic perspective view which shows a part of soundproof room provided with the sound absorber which concerns on one Embodiment of this invention. It is the schematic sectional drawing which looked at the soundproof room provided with the sound absorber concerning one embodiment of this invention from the ceiling side. It is sectional drawing at the time of cut | disconnecting a soundproof room in the XII-XII cross section in FIG. It is an enlarged view which expands and shows the area | region in which the sound-absorbing body was provided in the soundproof room. It is an enlarged view which expands and shows the area | region in which the sound absorber was provided in a soundproof room, and shows the state which removed the sound absorber. It is a graph which shows the relationship between the sound of the sound in a soundproof room, and a sound pitch. It is a figure which expands and shows the area | region in which the sound absorber was provided among the soundproof rooms provided with the sound absorber which concerns on one Embodiment of this invention, and is an enlarged view of the area | region shown by XVI in FIG. It is sectional drawing which shows the soundproof room provided with the sound absorber which concerns on other embodiment of this invention. It is sectional drawing which shows the soundproof room provided with the sound absorber which concerns on further another embodiment of this invention. It is sectional drawing which shows the soundproof room provided with the sound absorber which concerns on further another embodiment of this invention. It is sectional drawing which shows a soundproof room. It is sectional drawing which shows a soundproof room. It is sectional drawing which shows a soundproof room. It is a schematic perspective view which shows a soundproof room. It is sectional drawing which shows a soundproof room. It is sectional drawing which shows a soundproof room. It is a schematic sectional drawing which shows a soundproof room. It is a schematic sectional drawing which shows a soundproof room. It is a schematic perspective view which shows a soundproof room. It is a schematic perspective view which shows a soundproof room. It is a schematic perspective view which shows a soundproof room.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing an external appearance of a sound absorber 11a according to an embodiment of the present invention. 2 is a view of the sound absorber 11a shown in FIG. 1 as viewed from the direction of arrow II in FIG. 1, and is a view of the sound absorber 11a as viewed from the upper side. From the viewpoint of easy understanding, in FIG. 2, illustration of a layered member to be described later is omitted. FIG. 3 is a view of the sound absorber 11a shown in FIG. 1 as viewed from the direction of the arrow III in FIGS. FIG. 3 corresponds to a view of the sound absorber 11a as viewed from the front surface side serving as a sound absorbing surface to be described later. 4 is a view of the sound absorber 11a shown in FIG. 1 as seen from the direction opposite to the direction of the arrow III in FIGS. FIG. 4 corresponds to a view of the sound absorber 11a viewed from the back side described later. FIG. 5 is a view of the sound absorber 11a shown in FIG. 1 as viewed from the direction of the arrow V in FIG. From the viewpoint of easy understanding, in FIGS. 3 to 5 and FIGS. 6, 7, and 9 described later, a part of the layered member described later is not shown. Moreover, the direction of the arrow III shown in FIGS. 1 and 2 is the depth direction of the sound absorber 11a.

With reference to FIGS. 1-5, the sound absorber 11a which concerns on one Embodiment of this invention is substantially triangular prism shape, and is a pentagonal prism shape as exact | strict shape. The external shape of the sound absorber 11a is such that the upper surface 12a located on one end side in the longitudinal direction of the pentagonal columnar sound absorber 11a, the lower surface 13a located on the other end side in the longitudinal direction, and the sound absorber 11a extending in the longitudinal direction. The first side surface 14a, the second side surface 15a, the third side surface 16a, the fourth side surface 17a, and the fifth side surface 18a. The second side surface 15a and the third side surface 16a are provided adjacent to each other. The fourth side surface 17a is provided between the first side surface 14a and the second side surface 15a. The fifth side surface 18a is provided between the first side surface 14a and the third side surface 16a. The upper surface 12a and the lower surface 13a are pentagonal, and the first side surface 14a, the second side surface 15a, the third side surface 16a, the fourth side surface 17a, and the fifth side surface 18a are all rectangular. Of the first side surface 14a, the second side surface 15a, the third side surface 16a, the fourth side surface 17a, and the fifth side surface 18a, the area of the first side surface 14a is the largest. The areas of the second side surface 15a and the third side surface 16a are equal to each other, and then the areas thereof are increased. The areas of the fourth side surface 17a and the fifth side surface 18a are also configured to be equal. Note that FIG 5 representing the second side 15a as seen from the direction indicated by the arrow V in FIG. 2, the left and right symmetrical, a third side face 16a as seen from the direction shown by an arrow B ₁ in FIG. 2 It becomes the same as the figure showing.

  When the sound absorber 11a is attached to a soundproof room, which will be described later, the rectangular first side surface 14a becomes a surface 19a that becomes a surface exposed to the room, and the rectangular second side surface 15a and the third side surface. 16a becomes the back surface 20a used as the surface covered with the wall which comprises a chamber. That is, the first side surface 14a corresponds to the surface 19a of the sound absorber 11a exposed to the room, and the second side surface 15a and the third side surface 16a are walls constituting the soundproof room, specifically, the soundproof wall. This corresponds to the back surface 20a of the sound absorbing body 11a covered with. The sound absorber 11a is attached to a predetermined place in the room with the lower surface 13a being the lower side in the vertical direction. That is, in FIGS. 1 and 3 to 5, the vertical direction is a downward direction on the paper surface indicated by an arrow II.

  The sound absorber 11a has a substantially triangular prism shape, and includes two corner portions 22a and a corner portion 23a excluding a corner portion 21a that is a right angle among right-angled isosceles triangles, specifically, a first side surface 14a and a second side portion. Both the corner portion 22a formed between the side surface 15a and the corner portion 23a formed between the first side surface 14a and the third side surface 16a are straightened in the longitudinal direction with a predetermined thickness. The shape is chamfered to cut off. The fourth side surface 17a and the fifth side surface 18a are formed by removing the corner portions 23a and 24a. The corner portion 22a and the corner portion 23a are indicated by dotted lines in FIG. That is, the sound absorber 11a has a substantially triangular cross section when cut by a plane including a line extending in a direction from the front surface 19a to the back surface 20a.

That is, when the upper surface 12a side is described, the shape of the right isosceles triangle is the first line 24a constituting the first side surface 14a, the second line 25a constituting the second side surface 15a, and the third line. It is represented by a third line 26a constituting the side surface 16a. Angle _{A 1} between the second line 25a and the third line 26a is 90 degrees. The angle _{A 2} between the first line 24a and the second line 25a is 45 degrees. Angle _{A 3} between the first line 24a and the third line 26a is 45 degrees. It should be noted that the fourth line 27a constituting the fourth side surface 17a and the fifth line 28a constituting the fifth side surface 18a are both straight along the direction of the arrow III, which is the upward direction in the drawing of FIG. It is provided to extend. That is, the sound absorber 11a is configured to have a portion having a different thickness from the front surface 19a toward the back surface 20a. In other words, the sound absorber is configured to have a portion having a thickness that varies from the sound absorbing surface toward the depth direction. In this case, since both the second side surface 15a and the third side surface 16a are inclined and extended with respect to the first side surface 14a, the sound absorber 11a is continuously directed from the front surface 19a toward the back surface 20a. It will have a part where thickness differs.

For example, 46 cm (centimeters) is selected as the length L1 of the _first line 24a from the one end 29a to the other end 29b of the first line 24a. The length L ₂ of the second line 25a from the one end 29c to the other end 29d of the second line 25a and the third line from the one end 29e to the other end 29d of the third line 26a the length of 26a _{L 3} together, for example, 35 cm is selected. Further, the length L ₄ of the fourth line 27a from the one end 29a to the other end 29c of the fourth line 27a and the fifth L from the one end 29b to the other end 29e of the fifth line 28a. the length _{L 5} of the line 28a together, for example, 2 cm is selected. The length _{L 6} of the vertical bisector extending from the corner 21a to the first line 24a between the second line 25a and the third line 26a, for example, 25 cm is selected. That is, in this case, with respect to the sound absorber 11a, the length in the thickness direction from the front surface 19a to the back surface 20a is 23 cm or more, and the length in the thickness direction from the surface 19a to the back surface 20a is less than 23 cm. Second portions 31b and 31c. That is, the sound absorber 11a includes a first portion 31a having a depth dimension of 23 cm or more from the sound absorbing surface and second portions 31b and 31c having a depth dimension of less than 23 cm from the sound absorbing surface. The second portion 31b is located on the second side surface 15a side, and the second portion 31c is located on the third side surface 16a side. Here, the position of 23 cm in the thickness direction from the first side surface 14a is indicated by a point 32a on the second side surface 15a side and by a point 32b on the third side surface 16a side. That is, each point 32a from the first line 24a, the length _{L 7} of the perpendicular line drawn towards the 32b becomes the 23cm.

  Here, for the sound absorber 11a, a depth dimension maximum region where the depth dimension is maximum, and a depth dimension increase region which is located adjacent to the depth dimension maximum region and increases as the depth dimension from the sound absorbing surface approaches the maximum. It is the structure containing. That is, the depth dimension maximum region where the depth dimension is maximum is a region where the corner 21a between the second line 25a and the third line 26a is located. And about the depth dimension increase area | region which is located adjacent to the depth dimension maximum area and increases as the depth dimension from a sound absorption surface approaches the maximum, the area | region 30a in which the 2nd side surface 15a and the 3rd side surface 16a are located 30b.

Also, the longitudinal length _{L 8} serving as a height direction from the upper surface 12a to lower surface 13a, for example, 240 cm is selected. Incidentally, the length L ₁ described above may laterally, i.e. that the lateral direction as the width direction. In addition, the longitudinal direction that is the height direction may be referred to as a vertical direction.

  Here, the sound absorber 11a is formed by laminating a plurality of layered members 33a, 33b, 33c, 33d, 33e, 33f, 33g, 33h, 33i, and 33j. FIG. 6 is a view of the sound absorber 11a shown in FIG. 1 as viewed from above, and is a view as seen from the direction of arrow II in FIG. FIG. 6 corresponds to the diagram shown in FIG. 2 and illustrates some of the layered members 33a to 33j among the plurality of layered members. FIG. 7 is an exploded perspective view in which the sound absorber 11a formed of the plurality of layered members 33a to 33j is disassembled in units of the layered members 33a to 33j. FIG. 8 is a schematic sectional view showing one of the layered members 33a forming the sound absorber 11a.

  1 to 8, the sound absorber 11a is a so-called laminated structure 34a formed by laminating a plurality of layered members 33a to 33j. Here, the configuration of the layered member 33a that is disposed on the most surface 19a side, that is, the sound absorbing surface side and that constitutes the first side surface will be described. The layered member 33a is made of a nonwoven fabric. Specifically, the layered member 33a is a member formed by intricately intertwining a plurality of polyester fibers 35a, specifically, a plurality of PET (Polyethylene terephthalate) fibers having a predetermined length. For example, glass wool or rock wool is selected as another material of the layered member 33a.

The length _{L 1} extending to the end face 36b from the lateral end face 36a of the laminar member 33a corresponds to the horizontal length _{L 1} of the first aspect 14a. The end face 36a constitutes a part of the fourth side face 17a, and the end face 36b constitutes a part of the fifth side face 18a. The thickness of the laminar member 33a, i.e., on the surface 37b of the other side which is positioned downward in the thickness direction from one side surface 37a positioned upward in the thickness direction of the laminar member 33a shown by the length L ₉ in FIG. 8 The thickness to reach is about several millimeters (millimeters). The surface 37a constitutes a part of the upper surface 12a, and the surface 37b constitutes a part of the lower surface 13a. The other plurality of layered members 33b to 33j are composed of members similar to the layered member 33a, although the density, that is, the weight per unit volume is different from that of the layered member 33a. Specifically, the density of the layered member 33a located closest to the surface 19a is configured to be higher than the density of the other layered members 33b to 33j. By doing so, in the layered member 33a positioned closest to the surface 19a, a certain amount of sound can be reflected on the first side surface 14a side, that is, the surface 19a. Such a certain amount of sound reflection is effective as sound reverberation in the room. A plurality of the layered members 33a to 33j are stacked in the thickness direction, that is, the depth direction, to form the sound absorber 11a including the stacked structure 34a.

  In this case, one layered member 33a-33j is attached to the other layered member 33a-33j so that the adjacent layered members 33a-33j are entangled with each other to some extent. That is, for the sound absorber 11a formed by laminating a plurality of layered members 33a to 33j, for example, when the sound absorber 11a is lifted up, each of the layered members 33a to 33j is not separated. The laminated structure 34a is handled as an integral object. Note that the boundaries between the layers of the layered members 33a to 33j do not have to be clearly identified by visual observation or the like. For example, high-density portions and low-density portions in the stacked structure 34a alternate. The configuration as shown in FIG. Of course, a member having an adhesion function and a holding function may be interposed on the surfaces where the adjacent layered members 33a to 33j face each other. Moreover, after laminating the layered members 33a to 33j, the fibers located on the surface layers of the layered members 33a to 33j are slightly entangled with each other by applying pressure in the laminating direction to form a laminated structure 34a. You may decide.

Here, the plurality of layered members 33A～33j, the side to be disposed on the first side surface 14a described above, the size of the laminar member 33 a to 33 d, i.e., in the longitudinal direction of the laminar member 33 a to 33 d length _{L 8} which lateral direction of the length L ₁ is aligned more, it is formed by this four-layer laminated with. However, from the middle of the stacking direction in the layered member 33E～33j, as the longitudinal length L ₈ are those length L ₁ in the lateral direction of those of the same is gradually shortened gradually stacked Is formed. Specifically, the layers are laminated so as to form the shapes shown in FIGS. 2 and 6 when viewed from the upper surface 12a or the lower surface 13a. In this case, the layered members 33e to 33j are provided so that their end faces are inclined obliquely. Furthermore, the shape of the layered member 33j disposed on the side farthest from the surface 19a side is configured to be a triangular prism shape. Further, the thickness in the stacking direction of the sound absorber 11a, which is the direction indicated by the arrow III in FIG. 6, is continuously different, specifically, the left and right sides of the sound absorber 11a shown in the left-right direction in FIG. direction of the center becomes thick, the right and left direction of the end face 36a, is formed so as to continuously reduce the lateral direction of the length L ₁ toward 36b. That is, with respect to the first side surface 14a, the second side surface 15a and the third side surface 16a are formed to be surfaces that are inclined straight. In this case, each end surface of the layered members 33e to 33j constitutes the back surface 20a of the sound absorber 11a.

  In addition, it is as follows when an example of the manufacturing method of the sound absorber 11a of such a structure is demonstrated easily. FIG. 9 is a cross-sectional view showing a part of the intermediate member 38a in the manufacturing process in an example of the method for manufacturing the sound absorber 11a. Referring to FIG. 9, first, a plurality of layered members 39a, 39b, and 39c having the same size in the vertical and horizontal directions are stacked. And the intermediate member 38a is cut | disconnected so that it may become the shape of the final sound absorption body 11a. The cut surface 40a in this case is indicated by a dotted line in FIG. In this way, the sound absorber 11a may be manufactured. By doing so, the sound absorber 11a can be manufactured more efficiently.

  Here, the sound absorber 11a may be provided with an attachment / detachment mechanism that enables attachment / detachment from the soundproof room when the sound absorber 11a is provided in a soundproof room described later. Examples of the attachment / detachment mechanism include a stopper that can be held by a wall in a soundproof room, a fixed portion, and the like. Moreover, it is good also as a structure provided with the installation part to the soundproof room mentioned later. In addition, the sound absorber 11a may have a configuration in which moving means such as casters are provided on the lower side of the lower surface 13a. By doing so, the sound absorber 11a itself can be easily moved during attachment to and removal from the soundproof room.

  Next, a soundproof room provided with a sound absorber 11a according to an embodiment of the present invention will be described. FIG. 10 is a schematic perspective view showing a part of a soundproof room 41a provided with a sound absorber 11a according to an embodiment of the present invention. FIG. 11 is a schematic cross-sectional view of the soundproof room 41a provided with the sound absorber 11a according to the embodiment of the present invention, as viewed from the ceiling 48a described later. FIG. 12 is a cross-sectional view of the soundproof room 41a taken along the XII-XII cross section in FIG. FIGS. 13 and 14 are enlarged views showing a region where the sound absorber 11a is provided in the soundproof room 41a, and FIG. 14 shows a state where the sound absorber 11a is removed. In FIGS. 13 and 14, from the viewpoint of easy understanding, illustration of the sound absorber 11 a and a part of an installation portion described later, specifically, an upper portion in the height direction of the sound absorber 11 a is omitted. Yes. Further, hatching in some drawings is omitted.

  With reference to FIGS. 10-14, the soundproof room 41a provided with the sound absorber 11a according to the embodiment of the present invention can play a musical instrument (not shown) in the space 43a therein. The soundproof structure is provided. That is, a wall constituting a soundproof room 41a described later is a soundproof wall. The soundproof room 41a includes one sound absorber 11a having the configuration shown in FIG. The soundproof room 41a is composed of four walls 44a, 45a, 46a, 47a, a ceiling 48a, and a floor 49a. The walls 44a, 45a, 46a, 47a, the ceiling 48a, and the floor 49a are configured such that the inner space 43a side is a flat wall surface 50a, 51a, 52a, 53a, a ceiling surface 54a, and a floor surface 55a. The wall surface 50a and the wall surface 52a, and the wall surface 51a and the wall surface 53a are provided so as to face each other. Moreover, the ceiling surface 54a and the floor surface 55a are provided so as to face each other in the vertical direction. The soundproof room 41a has a so-called substantially rectangular parallelepiped shape. That is, for the four corners 56a, 57a, 58a, 59a constituted by the walls 44a, 45a, 46a, 47a of the soundproof room 41a, the corners 56a, 57a, 57a formed by the wall surfaces 50a, 51a, 52a, 53a, respectively. The angle of 58a and 59a viewed from the ceiling 48a side is 90 degrees. The soundproof room 41a is configured to have a size capable of playing various musical instruments such as a drum, a piano, a tuba, and a cello in the internal space 43a. Although not shown, the soundproof room 41a is provided with predetermined lighting equipment, doors for entering and exiting the room, loading and unloading of musical instruments, and the like.

The adjacent wall surface 50a and the wall surface 51a are provided with mounting portions 60a and 61a for attaching the sound absorber 11a. The installation parts 60a and 61a are provided in the vicinity of the corner part 56a which becomes the corner of the soundproof room 41a composed of the wall surface 50a and the wall surface 51a. Both the mounting portions 60a and 61a have a triangular prism shape, and the cross-sectional shape when cut along a plane perpendicular to the longitudinal direction is a right-angled isosceles triangle. And the installation part 60a is attached so that the side surface 62a of the side which comprises the long side among right-angled isosceles triangles contact | abuts the wall surface 50a. Similarly, the installation portion 61a is attached such that the side surface 63a on the side constituting the long side of the right isosceles triangle contacts the wall surface 51a. In the installation parts 60a and 61a attached to the wall surfaces 50a and 51a, the side surfaces 64a and 65a on the side constituting one short side of the right isosceles triangle are provided so as to face each other. And side 64a, the length L ₁₀ between the side surface 65a, the first wall 14a or approximately the same as the horizontal length L ₁ of the contained in the sound absorbing member 11a, and is slightly longer constituted with a margin.

  The sound absorber 11a is attached by fitting to the installation parts 60a and 61a. That is, the sound absorber 11a is provided at the corner 56a of the soundproof room 41a constituted by the wall 44a and the wall 45a. In this case, the sound absorber 11a is detachably provided in the soundproof room 41a. Further, the first side surface 14a of the sound absorber 11a becomes the surface 19a and is provided so as to be exposed in the soundproof room 41a. Further, the second side surface 15a constituting a part of the back surface 20a of the sound absorber 11a faces the wall surface 50a, and the third side surface 16a constituting a part of the back surface 20a of the sound absorber 11a faces the wall surface 51a. Is provided. That is, the back surface 20a of the sound absorber 11a is configured to be covered with the walls 44a and 45a, specifically, the wall surfaces 50a and 51a. The second side surface 15a and the wall surface 50a, and the third side surface 16a and the wall surface 51a are in contact with each other, or between the second side surface 15 and the wall surface 50a, and between the third side surface 16a and the wall surface 51a. Between, it is comprised so that it may hardly have a clearance gap. In this case, the fourth side surface 17a is also covered with the wall surface 50a. That is, the fourth side surface 17a is configured to abut against the wall surface 50a or have almost no gap. The fifth side surface 18a is also covered with the wall surface 51a. That is, the fifth wall surface 18a is configured to abut against the wall surface 51a or have almost no gap. The upper surface 12a and the ceiling surface 54a are opposed to each other, and the lower surface 13a and the floor surface 55a are opposed to each other. Specifically, the upper surface 12a and the ceiling surface 54a, and the lower surface 13a and the floor surface 55a abut, or between the upper surface 12a and the ceiling surface 54a, and between the lower surface 13a and the floor surface 55a. It is configured so as to have almost no gap.

  According to the soundproof room 41a provided with such a sound absorber 11a, the sound absorber 11a included in the soundproof room 41a has a portion whose thickness varies in the depth direction from the surface 19a serving as a sound absorbing surface for absorbing sound. For sound coming in from the sound-absorbing surface exposed inside, the relatively thick part absorbs the sound in the bass region with a short wavelength, and the relatively thick part is relatively thin. It is possible to efficiently absorb a sound in a high-frequency region having a long wavelength in both of the portions. That is, it is possible to efficiently absorb sound over a wide range from the high sound region to the low sound region. In this case, since the sound absorber 11a is formed by laminating a plurality of layered members 33a to 33j from the sound absorbing surface toward the depth direction, the sound absorbing body 11a cannot be absorbed by the layered member located on the sound absorbing surface side, and the sound absorbing surface side Even the sound that has passed through the layered member can absorb the sound transmitted by the other layered member located in the depth direction. Therefore, more appropriate indoor sound absorption can be performed.

  This will be specifically described. FIG. 15 is a graph showing the relationship between the sound of the sound in the soundproof room 41a, that is, the sound and the pitch of the sound. In FIG. 15, the vertical axis represents the degree of sound reverberation, and the horizontal axis represents the pitch of the sound. About a vertical axis | shaft, the direction where a sound resonates, so that it goes to the upper side, ie, a reverberation is long, and it shows the direction where a sound does not resonate, that is, a reverberation is short, so that it goes to the lower side. As for the horizontal axis, the sound is higher as it goes to the right side, that is, indicates a high sound area, and the sound is lower as it goes toward the left side, that is, it indicates a low sound area. In FIG. 15, the case of the soundproof room 41a provided with the sound absorber 11a according to one embodiment of the present invention is shown by a solid line 66a, the case of sound absorption by a conventional sound absorbing material is shown by a one-dot chain line 66b, and for reference, A case where no sound absorbing material is used, that is, a case where no sound absorbing material is used is indicated by a two-dot chain line 66c. The conventional sound-absorbing material is a flat sound-absorbing material having a certain thickness, specifically about 10 mm, like a sound-absorbing panel. Note that the graph shown in FIG. 15 is relatively illustrated, and from the viewpoint of easy understanding, the sound range is roughly divided into a low sound region 67a, a middle sound region 67b, and a high sound region 67c on the horizontal axis. . For the bass region 67a, for example, the octave band center frequency is in the region of 125 Hz, and for the treble region 67c, for example, the octave band center frequency is in the region of 500 Hz. Note that the middle sound region 67b is a sound region between them.

  Referring to FIG. 15, when the sound absorbing material indicated by the two-dot chain line 66c in FIG. 15 is not used, the sound is of course not absorbed, and the sound is sounded in all regions from the low sound region 67a to the high sound region 67c. Will sound for a long time. Such sound is completely undesirable. In addition, when the conventional sound absorbing material indicated by the alternate long and short dash line 66b in FIG. 15 is used, the sound is absorbed as a whole as compared with the case where the sound absorbing material is not used, and the sound of the sound is temporarily increased toward the high sound region 67c side. Can be shortened. However, in the region 67d indicated by the dotted line in FIG. 15, the sound is greatly absorbed by only a certain range of sound range. Then, although the sound reverberation is low in a certain range, the sound is not so much absorbed in the sound range slightly higher and lower than that sound range, and the sound resonates longer. Become. Further, as the sound goes from the middle sound region 67b to the high sound region 67c, the sound is excessively absorbed, and as a result, the reverberation of the high sound region 67c is shortened. As for such sound, the high sound region 67c is so-called “skasuka”, and the low sound region 67a side remarkably reverberates, which is not preferable as a sound balance, and is far from what the player desires.

  On the other hand, in the case of the soundproof room 41a provided with the sound absorber 11a according to one embodiment of the present invention, the sound absorption rate of the sound absorber 11a gradually increases as the sound range increases for the low sound region 67a, and the sound of the sound is reduced. Becomes shorter. Then, from the middle sound region 67b to the high sound region 67c, the sound absorption rate of the sound absorber 11a shows a substantially constant value, and the value is maintained when the sound reverberation is shortened to some extent. This is the configuration. Such a sound has a good sound balance and is desired by a performer performing in the soundproof room 41a, for example.

Regarding this, the following can be considered. FIG. 16 is an enlarged view of a region provided with the sound absorber 11a in the soundproof room 41a provided with the sound absorber 11a according to one embodiment of the present invention, and is a region indicated by XVI in FIG. FIG. The sound absorber 11a shown in FIG. 16 corresponds to FIG. Referring to FIG. 16, the sound absorber 11 a according to the embodiment of the present invention has portions having different thicknesses from the sound absorbing surface toward the depth direction. Here, in a portion having a different thickness in the sound absorber 11a, a first portion 31a having a length in the thickness direction of 23 cm or more from the front surface 19a to the back surface 20a, and a length in the thickness direction from the front surface 19a to the back surface 20a. Are roughly divided into second portions 31b and 31c having a length of less than 23 cm. And in this 1st part 31a, the sound of the bass region 67a is absorbed. Here, as a bass, for example, in the case of a sound having a frequency of 125 Hz, which is a frequency that represents the very bass side of a piano, the wavelength is about 2.72 m, and if the thickness of 1/12 of the wavelength can be secured, the sound is absorbed. Therefore, 2720 cm / 12 = about 23 cm. That is, by securing a length in the thickness direction of 23 cm or more for the first portion 31a, it is possible to reliably absorb sound having this frequency of 125 Hz. Incidentally, considering the dimensional error or the like at the time of manufacture of the sound absorbing body 11a, as the length L ₆ described above, is set to be ensured 25 cm. And in addition to the 1st part 31a, in the 2nd part 31b and 31c used as less than 23 cm, the sound of the high region 67c in which a wavelength becomes shorter than 23 cm, for example, the sound whose frequency is 500 Hz, can be absorbed. That is, for the bass region 67a, the region that absorbs sound is relatively small as the first portion 31a, and for the treble region 67c, the region that absorbs sound is the first portion 31a, the second portion 31b, 31c is relatively large. Then, the sound absorption coefficient in the low sound region 67a, specifically, the octave band center frequency is 125 or more in the 125 Hz band, and the sound absorption coefficient in the high sound region 67c, specifically, the octave band center frequency, in the 500 Hz band is 0. 8 to 1.0. With respect to this, if the sound absorption coefficient in the octave band center frequency is 125 Hz is set to a value smaller than 0.5, for example, 0.4 or 0.3, the comfort of the performer or listener in the bass may be impaired. Because. Further, if the sound absorption coefficient in the octave band center frequency is 500 Hz, less than 0.8, for example, 0.7 or 0.6, the treble region is not sufficiently absorbed and the treble sound is too much, which may be annoying to the player or listener. This is because there is a risk of sound. In this case, since the thickness of the sound absorber 11a is continuously reduced, specifically, the depth dimension maximum region where the depth dimension from the sound absorbing surface is the maximum as the corner portion 21a and the depth dimension maximum region are adjacent to each other. And the depth dimension increasing regions 30a and 30b that increase as the depth dimension from the sound absorbing surface approaches the maximum, and thus continuously and efficiently absorb sound from the low sound region to the high sound region. be able to. That is, the sound in the middle sound region 67b between the low sound region 67a and the high sound region 67c can also be efficiently absorbed.

  With such a configuration, more appropriate sound absorption in the room can be performed in the soundproof room 41a provided with the sound absorber 11a according to the embodiment of the present invention. That is, since the sound absorption coefficient in the octave band center frequency 125 Hz band of the sound absorber 11a is 0.5 or more, and the sound absorption coefficient in the octave band center frequency 500 Hz band of the sound absorber 11a is 0.8 to 1.0, A more appropriate sound can be obtained.

  In the above embodiment, the sound absorber 11a has a substantially triangular cross section. However, the present invention is not limited to this, and may have the following shape, for example.

  FIG. 17 is a cross-sectional view showing a soundproof room 41b provided with a sound absorber according to another embodiment of the present invention. FIG. 17 corresponds to a portion indicated by a region XVI in FIG. In the embodiment shown in FIG. 17, members having the same configuration as the members shown in FIG. 11 and the like are denoted by the same reference numerals and description thereof is omitted. The same applies to the following drawings.

  Referring to FIG. 17, the soundproof room 41b includes a sound absorber 11b. The structure of the walls and the like constituting the soundproof room 41b is the same as that shown in FIG. That is, the wall 44a, 45a, 46a, 47a, the ceiling 48a, and the floor 49a are configured. The sound absorber 11b includes an upper surface, a lower surface, a front surface 19b composed of a first side surface 14b, and a back surface 20b composed of a second side surface 15b and a third side surface 16b. Here, the second side surface 15b and the third side surface 16b are flat, but the first side surface 14b is a curved surface. In this case, in the cross section shown in FIG. 17, the first side surface 14b is provided in an arc shape. Specifically, the first side surface 14b is provided so as to be recessed in an arc shape toward the inner side of the sound absorber 11b. Even with such a configuration, the length in the thickness direction can be varied, so that more appropriate sound absorption in the room can be performed. In addition, about the 1st side surface 14b, the structure which protrudes in circular arc shape toward the outer side of the sound-absorbing body 11b may be sufficient. Furthermore, the first side surface 14b may be composed of a plurality of curved surfaces.

  Moreover, the embodiment shown below may be sufficient. FIG. 18 is a cross-sectional view showing a soundproof room 41c provided with a sound absorber according to still another embodiment of the present invention. Referring to FIG. 18, the soundproof room 41c includes a sound absorber 11c. The structure of the walls and the like constituting the soundproof room 41c is the same as that shown in FIG. The sound absorber 11c includes an upper surface, a lower surface, a front surface 19c composed of a first side surface 14c, and a back surface 20c. Here, the first side surface 14c is flat, but the back surface 20c is a curved surface. In this case, in the cross section shown in FIG. 18, the back surface 20c is provided in an arc shape. Specifically, the back surface 20c is provided so as to protrude in an arc shape toward the outer side of the sound absorber 11c. Even with such a configuration, more appropriate indoor sound absorption can be performed. In this case, a gap 68c is formed between the back surface 20c and the wall surfaces 50a and 51a. However, the back surface 20c is not exposed to the soundproof room 41a but is covered with the walls 44a and 45a. . Therefore, the existence of the gap 68c is not particularly problematic with respect to sound. In addition, about the back surface 20c, the structure dented in circular arc shape toward the inner side of the sound-absorbing body 11c may be sufficient. Furthermore, the back surface 20c may be composed of a plurality of curved surfaces.

  Moreover, it is good also as a structure shown below. FIG. 19 is a cross-sectional view showing a soundproof room 41d provided with a sound absorber according to another embodiment of the present invention. Referring to FIG. 19, the soundproof room 41d includes a sound absorber 11d. The structure of the walls and the like constituting the soundproof room 41d is the same as that shown in FIG. The sound absorber 11d includes a top surface, a bottom surface, a front surface 19d composed of a first side surface 14d, a back surface 20d composed of a second side surface 15d, a third side surface 16d, and a fourth side surface 17d. Is provided. The first side surface 14d, the second side surface 15d, and the third side surface 16d are all flat. Here, the fourth side surface 17d is also flat and provided to be parallel to the first side surface 14d in the cross section shown in FIG. In this case, the fourth side surface 17d has a triangular gap 68d when viewed from the ceiling 48a side between the wall surface 50a and the wall surface 51a and the fourth side surface 17d. Such a configuration may be used. That is, also in this case, since the back surface 20d is covered with the wall 44a and the wall 45a, even if it has the gap 68d, there is no particular problem from the viewpoint of sound. Of course, the fourth side surface 17d may be arcuate and may not be parallel to the first side surface 14d. Moreover, you may decide to comprise from several inclined flat surfaces.

  In the above embodiment, the sound absorber 11a and the like are provided in the corner portion 56a of the soundproof chamber 41a. However, the present invention is not limited to this, and for example, the vicinity of the corner portion 56a of the soundproof chamber 41a. It is good also as providing in.

  FIG. 20 is a cross-sectional view showing the soundproof room 41e in this case. FIG. 20 corresponds to the vicinity of a portion indicated by a region XVI in FIG. Referring to FIG. 20, the soundproof room 41e includes a sound absorber 11a having the configuration shown in FIG. Here, among the walls 45e constituting the soundproof room 41e, there is provided a recess 70e that is recessed from the flat wall surface 51e to the outside of the soundproof room 41e. The recess 70e is composed of two wall surfaces 71e and 72e. The wall surfaces 71e and 72e are provided so as to extend in a straight line with respect to the wall surface 51e, respectively. Moreover, the recessed part 70e formed by the wall surfaces 71e and 72e is a shape which receives the external shape of the sound-absorbing body 11a. That is, the wall surface 71e has a shape along the second side surface 15a, and the wall surface 72e has a shape along the third side surface 16a. Further, the amount of the recess 70e that is recessed from the wall surface 51e corresponds to the thickness of the sound absorber 11a.

  Here, the sound absorber 11a is accommodated in the recess 70e so that the second side surface 15a abuts on the wall surface 71e and the third side surface 16a abuts on the wall surface 72e. In this way, the sound absorber 11a may be provided in the soundproof room 41e. With this configuration, the sound absorber 11a does not protrude from the wall surface 51e in the soundproof chamber 41e, and the protruding portion of the sound absorber 11a into the soundproof chamber 41e can be eliminated. Can be used effectively.

  Moreover, it is good also as a structure shown below. FIG. 21 is a cross-sectional view showing the soundproof room 41f in this case. FIG. 21 corresponds to a portion indicated by a region XVI in FIG. Referring to FIG. 21, the soundproof room 41f includes a sound absorber 11a having the configuration shown in FIG. 1 and the like, and a sound absorber 11f having the same configuration as the sound absorber 11a. That is, the soundproof room 41f is configured to include two sound absorbers 11a and 11f. Here, of the walls 44f constituting the soundproof room 41f, a first recess 70f is provided which is recessed from the flat wall surface 50f to the outside of the soundproof room 41f. The first recess 70f is constituted by two wall surfaces 71f and 72f. The wall surfaces 71f and 72f are provided so as to extend in a straight inclination with respect to the wall surface 50f, respectively. The first recess 70f formed by the wall surfaces 71f and 72f has a shape that accepts the shape of the first sound absorber 11a. In addition, a second recess 73f that is recessed from the flat wall surface 51f to the outside of the soundproof room 41f is provided in the wall 45f that constitutes the soundproof room 41f. The second recess 73f is constituted by two wall surfaces 74f and 75f. The wall surfaces 74f and 75f are provided so as to extend in a straight line with respect to the wall surface 51f, respectively. The second recess 73f formed by the wall surfaces 74f and 75f has a shape that accepts the shape of the second sound absorber 11f. The wall surface 72f constituting the first recess 70f and the wall surface 74f constituting the second recess 73f are configured to be flat in the region of the corner portion 56a.

  Here, the first sound absorber 11a is accommodated in the first recess 70f so that the second side surface 15a is in contact with the wall surface 71f and the third side surface 16a is in contact with the wall surface 72f. The The second sound absorber 11f is accommodated in the second recess 73f such that the second side surface 15f is in contact with the wall surface 74f and the third side surface 16f is in contact with the wall surface 75f. . Thus, the first sound absorber 11a and the second sound absorber 11f are provided in the soundproof room 41f. By configuring in this way, with respect to the soundproof room 41f including the two sound absorbers 11a and 11f, the first sound absorber 11a and the second sound absorber 11f protrude from the wall surfaces 50f and 51f, respectively, in the soundproof room 41f. Since the protruding portion by the two sound absorbing bodies 11a and 11f in the soundproof room 41f can be eliminated, the space in the soundproof room 41f can be used effectively.

  Moreover, it is good also as a structure shown below. FIG. 22 is a cross-sectional view showing the soundproof room 41g in this case. Referring to FIG. 22, the soundproof room 41g includes a sound absorber 11a having the configuration shown in FIG. 1 and the like, and a sound absorber 11g having the same configuration as the sound absorber 11a. Here, among the walls 45g constituting the soundproof room 41g, a protruding part 76g is provided that protrudes from the flat wall surface 51g to the inside of the soundproof room 41g. The protruding portion 76g is constituted by three wall surfaces 77g, 78g, and 79g. The wall surface 78g is provided straight so as to be parallel to the wall surface 51g. The wall surface 77g and the wall surface 79g are provided so as to extend in a direction perpendicular to the wall surface 51g and straight toward the inside of the soundproof room 41g. The protruding portion 76g has a shape protruding in a so-called rectangular shape with respect to the wall surface 51g. The protruding amount of the protruding portion 76g from the wall surface 51g is the length of the third side surface 16a of the first sound absorber 11a and the length of the second side surface 15g of the second sound absorber 11g. The wall surfaces 77g and 79g have shapes along the third side surface 16a of the first sound absorber 11a and the second side surface 15g of the second sound absorber 11g, respectively.

  Here, the first sound absorber 11a is attached so that the second side surface 15a is in contact with the wall surface 51g and the third side surface 16a is in contact with the wall surface 77g. The second sound absorber 11g is attached such that the second side surface 15g is in contact with the wall surface 79g and the third side surface 16g is in contact with the wall surface 51g. In this way, the two sound absorbing bodies 11a and 11g are provided in the soundproof room 41g. With this configuration, the soundproof room 41g having the protrusion 76g inside the soundproof room 41g and including the two sound absorbers 11a and 11g has a corner portion formed by the protrusion 76g and the wall 45g. The two sound absorbers 11a and 11g can be arranged by using them, and the space in the soundproof room 41g can be used effectively.

  Moreover, it is good also as a structure shown below. FIG. 23 is a schematic perspective view showing the soundproof room 41h in this case. FIG. 23 corresponds to the case shown in FIG. Referring to FIG. 23, the soundproof room 41h includes three sound absorbers 80h, 81h, and 82h. The three sound absorbers 80h to 82h have the same basic functions as the sound absorber 11a shown in FIG. Specifically, the length in the height direction is slightly shorter than that of the sound absorber 11a shown in FIG. Here, the first sound absorber 80h is attached to the corner 56a formed on the wall surfaces 50a and 51a of the adjacent walls constituting the soundproof room 41h. In this case, the longitudinal direction is provided so as to extend from the ceiling surface 54a toward the floor surface 55a. A second sound absorber 81h is attached to a corner 83h formed by the wall surface 51a of the soundproof room 41h and the ceiling surface 54a of the ceiling. In this case, it is provided so that the longitudinal direction extends in the lateral direction. In addition, a third sound absorber 82h is attached to a corner 84h constituted by a wall surface 51a and a floor surface 55a constituting the soundproof room 41h. In this case, it is provided so that the longitudinal direction extends in the lateral direction. Such a configuration may be adopted.

  Here, the soundproof room may include an exposed area variable mechanism that varies the exposed area of the surface of the sound absorber exposed in the room.

  FIG. 24 is a cross-sectional view showing the soundproof room 41i in this case. Referring to FIG. 24, the soundproof room 41i includes the sound absorber 11a having the configuration shown in FIG. The sound absorber 11a is provided such that the surface 19a is exposed in the soundproof room 41i.

Here, the installation part 60a provided on the wall surface 50a of the soundproof room 41i is provided with a door part 85i that makes the exposed area of the surface 19a of the sound absorber 11a variable. The door portion 85i includes a flat plate-like member 86i and a support portion 87i that supports the plate-like member 86i so as to be rotatable by a predetermined angle. The shape and area of the plate-like member 86i are shapes and areas that can cover the surface 19a of the sound absorber 11a when the door portion 85i is in a so-called closed state. That is, the plate-like member 86i has a predetermined thickness and has a rectangular shape slightly larger than the first side surface 14a when viewed from the front surface 19a side. In addition, the state which closed the door part 85i is shown in FIG. 24, and the state which opened the door part 85i is shown in FIG. That is, the door portion 85i as the rotation center axis supporting portion 87i, is rotated in direction or vice versa showing the plate member 86i by the arrow B ₂ in FIG. 24, can be opened and closed.

  By comprising in this way, the exposed area of the surface 19a used as the sound absorption surface of the sound absorption body 11a in the soundproof room 41i can be made variable. If it does so, the grade of the sound absorption in the sound absorber 11a of an above-described structure can be changed, and the acoustic time in the soundproof room 41i can be adjusted. Therefore, for example, it becomes easy for the performer performing in the soundproof room 41i to make the sound in the soundproof room 41i more appropriate. In addition, about this door part 85i, you may be divided | segmented into plurality about the height direction of the surface 19a. That is, the door 85i provided at a certain height position may be opened and the door 85i provided at another height may be closed. Of course, the sound can be adjusted by adjusting the opening / closing angle of the plate-like member 86i.

  Moreover, it is good also as a structure shown below. FIG. 26 is a schematic cross-sectional view showing the soundproof room in this case. FIG. 26 is a view seen from the ceiling side of the room, and corresponds to the view shown in FIG. Referring to FIG. 26, the soundproof room 41j is configured to include two sound absorbers 11a and 11j configured as shown in FIG. The soundproof room 41j includes four walls 44a, 45a, 46a, 47a, a ceiling, and a floor, as in the case shown in FIG. The walls 44a, 45a, 46a, 47a, the ceiling, and the floor are each configured such that the inner space side is a flat wall surface 50a, 51a, 52a, 53a, a ceiling surface, and a floor surface.

  Here, the first sound absorber 11a is provided at a corner portion 56a formed between the wall 44a and the wall 45a, as in the case shown in FIG. The second sound absorber 11j is provided at a corner 58a formed between the wall 46a and the wall 47a. Also in this case, the first side surface 14j that becomes the surface 19j of the second sound absorber 11j is exposed in the soundproof room 41a, the second side surface 15j that becomes the back surface, and the third side surface 16j are the wall 46a, and the wall It is provided so as to be covered with 47a. In this case, the first sound absorber 11a and the second sound absorber 11j are provided so as to be positioned on a so-called diagonal line. The soundproof room 41j includes a door portion 85i that changes the exposed area of the surface 19a of the first sound absorber 11a, and a door portion 85j that changes the exposed area of the surface 19j of the second sound absorber 11j. . You may decide to comprise in this way. By carrying out like this, in the soundproof room 41j provided with the two sound-absorbing bodies 11a and 11j, the opening / closing state of each door part 85i and 85j can be changed, and it can be set as a more preferable acoustic state. In FIG. 26, the door 85i of the first sound absorber 11a is opened and the door 85j of the second sound absorber 11j is closed.

  Moreover, it is good also as a structure shown below. FIG. 27 is a schematic sectional view showing a soundproof room in this case. FIG. 27 is a view from the ceiling side of the soundproof room, and corresponds to the views shown in FIGS. 11 and 26. Referring to FIG. 27, the soundproof room 41k includes four sound absorbers 11a, 11j, 11k, and 88k having the structure shown in FIG. The soundproof room 41k includes four walls 44a, 45a, 46a, 47a, a ceiling, and a floor, as in the case shown in FIGS. The walls 44a, 45a, 46a, 47a, the ceiling, and the floor are each configured such that the inner space side is a flat wall surface 50a, 51a, 52a, 53a, a ceiling surface, and a floor surface.

  Here, the first sound absorber 11a is provided at a corner portion 56a formed between the wall 44a and the wall 45a, as in the case shown in FIG. The second sound absorber 11j is provided at a corner 58a formed between the wall 46a and the wall 47a as in the case shown in FIG. The third sound absorber 11k is provided at a corner 57a formed between the wall 45a and the wall 46a. The fourth sound absorber 88k is provided at a corner 59a formed between the wall 44a and the wall 47a. In this case, the first sound absorber 11a, the second sound absorber 11j, the third sound absorber 11k, and the fourth sound absorber 88k are formed at the so-called four corners of the rectangular soundproof chamber 41a when viewed from the ceiling side. It is provided so that it may be located.

  The soundproof room 41k includes a door 85i that changes the exposed area of the surface 19a of the first sound absorber 11a, a door 85j that changes the exposed area of the surface 19j of the second sound absorber 11j, A door portion 85k that can change the exposed area of the surface 19k of the third sound absorber 11k and a door portion 90k that can change the exposed area of the surface 89k of the fourth sound absorber 88k are provided. You may decide to comprise in this way. By carrying out like this, in the soundproof room 41k provided with the four sound-absorbing bodies 11a, 11j, 11k, 88k, changing the open / closed state of each door part 85i, 85j, 85k, 89k, and making it a more preferable acoustic state. Can do.

  In addition, the following structures may be sufficient. FIG. 28 is a schematic perspective view showing the soundproof room 41m in this case. FIG. 28 corresponds to the case shown in FIG. Referring to FIG. 28, the soundproof room 41m includes the sound absorber 11a having the configuration shown in FIG. The sound absorber 11a is provided such that a surface 19a serving as a sound absorbing surface is exposed in the soundproof room 41m.

Here, a door portion 91m that makes the exposed area of the surface 19a of the sound absorber 11a variable is provided on the installation portions 60a and 61a provided on the wall surfaces 50a and 51a of the soundproof room 41m, respectively. The door portion 91m is a shutter-like door composed of a plurality of flat plate-like members 92m and 93m. That is, a configuration in which the arrow B ₃ or movable plurality of plate members 92m in the vertical direction indicated by the direction of the opposite of FIG. 28, 93m is mounted portion 60a, is attached to 61a. The plate-like members 92m and 93m may be moved in the vertical direction so that the exposed area of the surface 19a of the sound absorber 11a into the soundproof chamber 41m can be varied.

  Moreover, the following structures may be sufficient. FIG. 29 is a schematic perspective view showing the soundproof room 41n in this case. FIG. 29 corresponds to the case shown in FIG. Referring to FIG. 29, the soundproof room 41n includes the sound absorber 11a having the configuration shown in FIG. The sound absorber 11a is provided such that the surface 19a is exposed in the soundproof room 41n.

Here, a screen member 94n that makes the exposed area of the surface 19a of the sound absorber 11a variable is provided on the installation portions 60a and 61a provided on the wall surfaces 50a and 51a of the soundproof room 41n, respectively. The screen member 94n is attached to the installation parts 60a and 61a. Screen member 94n is formed of a wound the example fabric member into a roll, the vertical direction, i.e., the longitudinal direction of the sound absorbing body 11a which is a direction of the direction or vice versa indicated by the arrow B ₄ in FIG. 29 It is configured to be stretchable. The screen member 94n can arbitrarily change the exposed area of the surface 19a serving as a sound absorbing surface from opening to closing. That is, the exposed area of the surface 19a can be made variable by pulling the screen member 94n downward, stopping the lower end portion at a predetermined location, and covering a part of the surface 19a. In addition, the state which stopped the lower end part of the screen member 94n in arbitrary positions is shown in FIG.

  Although not shown, as the above-described exposure area variable mechanism, for example, in the sound absorber 11a shown in FIG. 2, a rotation center axis extending in the longitudinal direction from the position of the corner portion 21a is provided. You may comprise so that it may attach to the corner part 56a of the chamber 41a shown in FIG. By doing so, the sound absorbing body 11a can be rotated about the rotation center axis, and the exposed area can be changed in the chamber 41a to expose the surface 19a or not to expose the surface 19a. In this case, the wall 44a may be provided with a housing portion that is partially recessed to accommodate the sound absorber 11a. Of course, any location in the chamber 41a in which the rotation center axis is provided may be used. Further, the rotation center axis is not particularly limited to the longitudinal direction.

  Moreover, it is good also as a structure which can draw out the sound absorber 11a from the wall 44a, and can accommodate the sound absorber 11a in the wall 44a. By doing so, the sound absorber 11a can be pulled out from the wall surface 50a of the wall 44a to some extent so that the necessary exposed area can be ensured according to the required sound level, and the surface 19a can be exposed in the chamber 41a. In this case or when the above-described rotation center axis is provided, a handle-like member may be provided on a part of the front surface 19a or the back surface 20a.

  In the above embodiment, the layered member is made of a nonwoven fabric. However, the present invention is not limited to this, and the layered member may be a woven fabric, for example, a paper-like member. Good.

  Moreover, in said embodiment, you may decide to provide in the sound-absorbing body itself about the installation part, the door part provided in the installation part, and the screen member provided in the installation part. That is, the sound absorber is a sound absorber that absorbs indoor sound, and may include an exposed area variable mechanism that varies the exposed area of the sound absorbing surface exposed to the room.

  In the above embodiment, the sound absorbing body is formed by laminating a plurality of layered members from the sound absorbing surface toward the depth direction. For example, it may be an integral object.

  As mentioned above, although embodiment of this invention was described with reference to drawings, this invention is not limited to the thing of embodiment shown in figure. Various modifications and variations can be made to the illustrated embodiment within the same range or equivalent range as the present invention.

  The sound absorber according to the present invention is effectively used when more appropriate sound absorption is required.

  11a, 11b, 11c, 11d, 11f, 11g, 11j, 11k, 80h, 81h, 82h, 88k Sound absorber, 12a upper surface, 13a lower surface, 14a, 14b, 14c, 14d, 14g, 14j, 15a, 15b, 15d, 15g, 15j, 16a, 16b, 16d, 16g, 16j, 17a, 17d, 18a, 62a, 63a, 64a, 65a side surface, 19a, 19b, 19c, 19d, 19j, 19k, 89k surface, 20a, 20b, 20c, 20d back surface, 21a, 22a, 23a corner, 24a, 25a, 26a, 27a, 28a, 66a, 66b, 66c line, 29a, 29b, 29c, 29d, 29e end, 30a, 30b, 67a, 67b, 67c, 67d area, 31a, 31b, 31c part, 32a, 32b point, 33 33b, 33c, 33d, 33e, 33f, 33g, 33h, 33i, 33j, 39a, 39b, 39c Laminated member, 34a Laminated structure, 35a Fiber, 36a, 36b End face, 37a, 37b face, 38a Intermediate member, 40a Cut surface, 41a, 41b, 41c, 41d, 41e, 41f, 41g, 41h, 41i, 41j, 41k, 41m, 41n Soundproof room, 43a space, 44a, 44f, 45a, 45e, 45f, 45g, 46a, 47a wall 48a ceiling, 49a floor, 50a, 50f, 51a, 51e, 51f, 51g, 52a, 53a, 71e, 71f, 72e, 72f, 74f, 75f, 77g, 78g, 79g wall surface, 54a ceiling surface, 55a floor surface, 56a, 57a, 58a, 59a, 83h, 84h Corners, 60a, 61 a Installation part, 68c, 68d Clearance, 70e, 70f, 73f Recessed part, 76g Protruding part, 85i, 85j, 85k, 90k, 91m Door part, 86i, 92m, 93m Plate-like member, 87i Support part, 94n Screen member.

Claims (10)

A sound absorber that absorbs indoor sound,
It has a part where the thickness varies from the sound absorbing surface that absorbs the sound in the room toward the depth direction,
The surface is formed by laminating a plurality of second layered members sequentially in the depth direction from the first layered member constituting the sound absorbing surface ,
The first layered member and the second layered member are made of the same material, and the density of the first layered member is higher than the density of the second layered member . Wherein each of the first and second laminar member is composed of a nonwoven fabric, the sound absorbing body according to claim 1. Sound absorption coefficient Oh Kutabubando center frequency 125Hz band is 0.5 or more,
The sound absorber according to claim 1 or 2, wherein the sound absorption coefficient at an octave band center frequency of 500 Hz is 0.8 to 1.0. Including the exposed area varying mechanism for the exposed area of the absorbing surface which is exposed to the chamber is variable, the sound absorbing body according to claim 1. The sound absorbing body according to claim 4, wherein the exposed area varying mechanism includes a door portion that varies an area covering the sound absorbing surface. 6. The sound absorber according to claim 4, wherein the exposed area variable mechanism includes a screen member that arbitrarily changes an exposed area of the sound absorbing surface from opening to closing. The sound absorber according to any one of claims 1 to 6, comprising a first portion having a depth dimension of 23 cm or more and a second portion having a depth dimension of less than 23 cm. A depth dimension maximum region having a maximum depth dimension from the sound absorbing surface, and a depth dimension increasing region located adjacent to the depth dimension maximum region and increasing as the depth dimension from the sound absorbing surface approaches the maximum. The sound absorber according to any one of claims 1 to 7. The sound absorber according to any one of claims 1 to 8, which has a substantially triangular prism shape. The sound absorber according to any one of claims 1 to 9, further comprising a detachable mechanism that can be detachably attached to the chamber.

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