JP2021070999A - Acoustic adjustment structure - Google Patents

Abstract

To effectively adjust acoustic characteristic in low frequency region and further in every frequency region, in an acoustic adjustment structure, and to improve beauty of a space in which acoustic characteristic is to be adjusted.SOLUTION: An acoustic adjustment structure of this invention includes: acoustic adjustment members 20, 30; and base members 10, 50 containing storage sections 11, 12, 51, 52 having storage spaces 11a, 12a, 51a, 52a. The storage sections include: front opening portions 11b, 12b, 51b, 52b; and storage peripheral wall portions 11c, 12c, 51c, 52c surrounding the storage spaces. The base members include resonance sections 13, 53 capable of forming resonance spaces 13a, 53a bringing Helmholtz resonance. The resonance spaces include spaces positioned at a rear face side of the storage spaces. There are provided partition plates 14, 54 between the storage spaces and the resonance spaces. The resonance sections include resonance peripheral wall portions 13b, 53b surrounding the resonance spaces. Through holes 13c, 53c making the resonance spaces communicate with an outer space are formed in the resonance peripheral wall portions.SELECTED DRAWING: Figure 3

Description

The present invention relates to an acoustically regulated structure configured to be adjustable in acoustic characteristics.

In acoustic rooms such as studios, listening rooms, and halls, acoustic diffusers, sound absorbing diffusers, and acoustic reflectors are used along the wall surfaces of the acoustic rooms, such as side walls and ceilings, in order to adjust the acoustic characteristics. , Sound absorbers and other acoustic adjustment members may be installed. The acoustic diffuser may be configured to have a plurality of columnar portions configured to be able to reflect such sound in order to provide an acoustic diffusion characteristic that diffuses the input sound. The acoustic diffuser also has acoustic reflection properties. Typically, such an acoustic diffuser is installed alone in the acoustic chambers so as to be exposed and cover the wall surface. The acoustic diffuser alone may also be mounted on the wall surface so that it is exposed in the acoustic chambers. (See, for example, Patent Document 1.)

The sound absorbing diffuser is composed of a frame having an opening surface and a large number of resonance vibrating grooves formed by arranging a large number of acoustic diaphragms in parallel at predetermined intervals inside the frame. Moreover, the depths of many resonance vibration grooves are set at random. The sound absorbing diffuser is embedded in the wall surface so that the opening surface of the frame body faces the acoustic chambers. (See, for example, Patent Document 2.)

The acoustic reflector has an acoustic reflection characteristic that reflects each input sound. Examples of the acoustic reflector include an acoustic reflector. The sound absorbing body has a sound absorbing characteristic that makes it possible to absorb the input sound. Examples of such a sound absorbing body include a sound absorbing cushion made of a porous material such as glass wool or rock wool.

Further, as an acoustic adjustment structure using such an acoustic reflector and a sound absorbing body, the upper surface of the box-shaped cabinet is opened, the box-shaped cabinet is divided into a plurality of cells by a partition plate, and the acoustic reflector or the sound absorbing body is used. An acoustic functional material is detachably installed inside each cell, and the acoustic functional material installed inside a plurality of cells is configured to consist of two or more types of acoustic functional materials different from each other. Adjustment structures have been proposed. (See, for example, Patent Document 3.)

International Publication No. 2009/142267 Japanese Unexamined Patent Publication No. 2011-140779 Japanese Unexamined Patent Publication No. 5-197383

However, the installation work such as the work of installing the acoustic adjustment member alone so as to cover the wall surface while exposing it in the acoustic rooms, the work of attaching the acoustic adjustment member alone to the wall surface so as to be exposed in the acoustic rooms, etc. It will be a big deal. Therefore, it is troublesome to re-install the acoustic adjustment member once installed in order to change the acoustic characteristics such as the sound absorption characteristic, the acoustic reflection characteristic, and the acoustic diffusion characteristic.

Further, since the acoustic adjusting members such as the acoustic diffuser, the sound absorbing diffuser, the acoustic reflector, and the sound absorbing body are inorganic, the appearance of the acoustic adjusting member is not excellent, and as a result, the acoustic adjusting member is used alone. The aesthetics of the installed acoustic chambers are not excellent. In particular, this is a problem in consideration of the increasing demand for improving the acoustic characteristics by installing the acoustic adjusting member even in a room of a general household.

Further, in the low frequency region of 100 Hz or less, the sound insulation performance of the material used for the acoustic adjustment member becomes small, and the structure of the acoustic adjustment member for adjusting the acoustic characteristics becomes large. Further, in the low frequency region, the sound absorbing effect of the sound absorbing body mainly made of glass wool or the like becomes small. Therefore, it is difficult to adjust the acoustic characteristics in the low frequency region by the acoustic adjusting member and the acoustic adjusting structure as described above.

In view of these circumstances, it is desired to effectively adjust the acoustic characteristics in the low frequency region in the acoustic adjustment structure, and by extension, to effectively adjust the acoustic characteristics in all frequency regions. Further, in the acoustic adjustment structure, it is desired to improve the aesthetic feeling of the space for which the acoustic characteristics are to be adjusted.

In order to solve the above problems, the acoustic adjustment structure according to one aspect includes an acoustic adjustment member configured to change the characteristics of the input sound and a storage that allows the acoustic adjustment member to be detachably stored. A front opening including a base member including a storage compartment having a space, and the storage compartment opens in front of the base member in the depth direction so as to open the storage space, and a height direction of the base member. An acoustically regulated structure having a storage peripheral wall surrounding the storage space in the width direction, the base member including a resonance compartment configured to be capable of forming a resonance space that results in Helmholtz resonance. The resonance space of the resonance compartment includes a space provided so as to correspond to the storage space of the storage compartment in the depth direction of the base member with respect to the storage space of the storage compartment. A partition plate that partitions the resonance space is provided, and the resonance section has a resonance peripheral wall portion that surrounds the resonance space in the height direction and the width direction of the base member, and the resonance space and the base member. A plurality of through holes penetrating the resonance peripheral wall portion are formed so as to communicate with the external space of the above.

In the acoustic adjustment structure according to one aspect, the acoustic characteristics in the low frequency region can be effectively adjusted, and by extension, the acoustic characteristics in any frequency region can be effectively adjusted. Further, in the acoustic adjustment structure according to one aspect, it is possible to improve the aesthetic appearance of the space for which the acoustic characteristics are to be adjusted.

FIG. 1 is a front view schematically showing an acoustic adjustment structure according to the first embodiment. FIG. 2 is a cross-sectional view taken along the line X1-X1 of FIG. FIG. 3 is a cross-sectional view taken along the line Y1-Y1 of FIG. FIG. 4 is a plan view schematically showing the acoustic adjustment structure according to the first embodiment. FIG. 5 is a right side view schematically showing the acoustic adjustment structure according to the first embodiment. FIG. 6 is a cross-sectional view schematically showing the acoustic adjustment structure of FIG. 3 in a state where one of the acoustic adjustment members is displaced in the depth direction of the base member. FIG. 7 is a cross-sectional view schematically showing a state in which the acoustic adjustment structure according to the second embodiment is cut by a line corresponding to the Y1-Y1 line of FIG. FIG. 8 is a front view schematically showing the acoustic adjustment structure according to the third embodiment. FIG. 9 is a sectional view taken along line X2-X2 of FIG. FIG. 10 is a cross-sectional view taken along the line Y2-Y2 of FIG. FIG. 11 is a plan view schematically showing the acoustic adjustment structure according to the third embodiment. FIG. 12 is a right side view schematically showing the acoustic adjustment structure according to the third embodiment. FIG. 13 is a cross-sectional view schematically showing a state in which the acoustic adjustment structure according to the fourth embodiment is cut by a line corresponding to the Y2-Y2 line of FIG. FIG. 14 is a graph showing the relationship between the acoustic frequency and the sound absorption coefficient in the acoustic adjustment shelf according to the examples and the comparative examples.

The acoustic adjustment structure according to the first to fourth embodiments will be described below. The acoustic adjustment structure according to each embodiment is configured to be installable in a space for adjusting acoustic characteristics (hereinafter referred to as "acoustic adjustment space"), and the acoustic characteristics of the acoustic adjustment space can be adjusted. It is composed of.

Here, the acoustic adjustment space may be a space defined by wall surfaces such as a ceiling surface, a floor surface, and a side wall surface. The acoustic adjustment space should be a space where people can enter. The acoustic adjustment space may be a space that is substantially closed from the outside, or a space that is partially open to the outside and partially closed from the outside. For example, a room having an acoustic adjustment space (hereinafter referred to as "acoustic adjustment room") includes a studio, a listening room, an acoustic room such as a hall, a conference room, an office room, an entrance hall, a waiting room, and a room of a general house. And so on. However, the acoustic adjustment room may, of course, be other than those exemplified here. Further, the acoustic adjustment space can be a space based on conditions other than the conditions described here.

"First embodiment"
The acoustic adjustment structure according to the first embodiment will be described.

"Outline of acoustic adjustment structure"
The outline of the acoustic adjustment structure according to the present embodiment will be described with reference to FIGS. 1 to 5. That is, the acoustic adjustment structure according to the present embodiment is roughly configured as follows. As shown in FIGS. 1 to 3, the acoustic adjustment structure (hereinafter, simply referred to as “structure” if necessary) has a base member 10 and a plurality of acoustic adjustment members 20, 30. The acoustic adjusting members 20 and 30 are configured to change the characteristics of the input sound. However, the structure can also be configured to have one acoustic conditioning member.

The base member 10 has a plurality of storage compartments 11 and 12. Each of the storage compartments 11 and 12 has storage spaces 11a and 12a in which one acoustic adjusting member 20 and 30 can be detachably stored. Each of the storage compartments 11 and 12 has front openings 11b and 12b that are opened so as to open the storage spaces 11a and 12a in front of the base member 10 in the depth direction. Each of the storage compartments 11 and 12 has storage peripheral wall portions 11c and 12c surrounding the storage spaces 11a and 12a in the height direction and the width direction of the base member 10.

As shown in FIGS. 2 and 3, the base member 10 has a resonance compartment 13 configured to allow the formation of a resonance space 13a that results in Helmholtz resonance. The resonance space 13a of the resonance compartment 13 is provided with respect to the storage spaces 11a and 12a of the storage compartments 11 and 12 so as to correspond to the storage spaces 11a and 12a near the back surface of the base member 10 in the depth direction. Including. The structure has a partition plate 14 that partitions the storage spaces 11a and 12a of the storage compartments 11 and 12 from the resonance space 13a. The structure has a plurality of partition plates 14 corresponding to the plurality of storage compartments 11 and 12, respectively. However, the structure may also have one partition plate partitioning between the storage space and the resonance space of some or all of the storage compartments of the plurality of storage compartments.

The resonance section 13 has a resonance peripheral wall portion 13b that surrounds the resonance space 13a in the height direction and the width direction of the base member 10. As shown in FIGS. 2 to 5, a plurality of through holes 13c penetrating the resonance peripheral wall portion 13b are formed in the resonance peripheral wall portion 13b so as to communicate the resonance space 13a and the external space E of the base member 10. There is. However, it is also possible to form one through hole in the resonance peripheral wall portion.

Here, as shown in FIGS. 1 to 3, the acoustic adjusting member 20 can be an acoustic diffuser 20 having a plurality of columnar portions 21 each capable of reflecting the input sound. The sound adjusting member 30 can also be a sound absorbing cushion 30 configured to be able to absorb sound. In the following, the storage section 11 in which the acoustic diffuser 20 is installed will be referred to as a diffusion section 11 as necessary. Further, the storage section 12 in which the sound absorbing cushion 30 is installed is referred to as a sound absorbing section 12 as necessary. However, the acoustic adjusting member is not limited to this. For example, the acoustic adjusting member may be a sound absorbing body other than the sound absorbing cushion, an acoustic reflector such as an acoustic reflecting plate, or the like.

As shown in FIGS. 2 and 3, the structure may have an additional acoustic conditioning member 40 configured to alter the characteristics of the input sound. The additional acoustic adjusting member 40 is detachably installed on the back side of the base member 10 with respect to the acoustic diffuser 20 in the diffusion section 11. The additional sound adjusting member 40 is a sound absorbing cushion configured to be able to absorb sound, that is, an additional sound absorbing cushion 40. However, the additional acoustic adjusting member is not limited to this. For example, the additional acoustic adjusting member may be an acoustic diffuser, a sound absorber other than the sound absorbing cushion, an acoustic reflector such as an acoustic reflector, or the like. It is also possible not to install an additional acoustic adjustment member in the diffusion section. That is, the structure may also have a diffusion section in which only the acoustic adjusting member is installed.

As shown in FIGS. 1 to 3, the structure, specifically the base member 10, has both diffusion and sound absorbing compartments 11 and 12. In FIG. 1, as an example, a structure having nine storage compartments 11 and 12, specifically, five diffusion compartments 11 and four sound absorbing compartments 12 is shown. However, the number of storage compartments in the structure, as well as the number of diffusion and sound absorption compartments, is not limited to this. The structure can be configured to have at least one of a diffusion and sound absorbing compartments. The structure can also have only diffusion compartments. The structure can also have only sound absorbing compartments. The structure may also have a storage compartment in which no member is placed, in addition to at least one of the diffusion and sound absorbing compartments. Furthermore, the placement position of the diffusion and sound absorption compartments is also not limited to the placement position shown in FIG.

"Details of acoustic adjustment structure"
The details of the acoustic adjustment structure according to the present embodiment will be described with reference to FIGS. 2 and 3. That is, the acoustic adjustment structure according to the present embodiment can be configured in detail as follows. One resonance space 13a is located closer to the back surface of the base member 10 with respect to the storage spaces 11a and 12a of two or more storage compartments 11 and 12 among the plurality of storage compartments 11 and 12, and these two or more storage spaces 11a. , 12a includes a space that is continuously provided so as to correspond to.

The resonance section 13 has a back opening 13d that opens on the back of the base member 10 so as to open the resonance space 13a. The back opening 13d is closed by the wall surface W in a state where the base member 10 is installed so that the back surface of the base member 10 is aligned with the wall surface W provided outside the base member 10. In the present embodiment, the wall surface W is the side wall surface W of the acoustic adjustment chamber R. In this case, the structure is installed so that the back surface of the base member 10 is along the side wall surface W. However, the wall surface can also be the floor surface or ceiling surface of the acoustic adjustment room. In this case, the structure is installed so that the back surface of the base member is along the floor surface or the ceiling surface.

Further, a gap G is formed between the partition plate 14 and the storage peripheral wall portions 11c and 12c. The partition plate 14 is supported by the acoustic adjusting members 20 and 30. However, the partition plate can also be attached to the storage peripheral wall portion of the storage section of the base member.

"Details of base member"
With reference to FIGS. 1 to 5, the base member 10 can be configured in detail as follows. The base member 10 has a base peripheral wall portion 10a that defines the outer shape of the base member 10 in the height direction and the width direction thereof. The base peripheral wall portion 10a has a bottom portion 10b and a top portion 10c of the base member 10 in the height direction, and two side portions 10d in the width direction of the base member 10.

The base peripheral wall portion 10a partially faces the external space E of the base member 10 in the circumferential direction thereof. For example, when the base member 10 is installed so that the bottom portion 10b of the base peripheral wall portion 10a abuts on the floor surface F of the acoustic adjustment chamber R, the top portion 10c of the base peripheral wall portion 10a and the two side portions 10d are external. It can face space E. However, the peripheral wall portion of the base can also face the external space as a whole in its circumferential direction. In this case, the base member may be installed so that its bottom is spaced in the height direction with respect to the floor surface of the acoustic adjustment chamber and its back surface is attached to the side wall surface of the acoustic adjustment chamber.

"Details of storage compartment"
With reference to FIGS. 1 to 3, the storage compartments 11 and 12 of the base member 10 can be configured in detail as follows. As shown in FIGS. 2 and 3, each of the storage compartments 11 and 12 is formed so as to extend in the depth direction. The storage peripheral wall portions 11c and 12c of the storage compartments 11 and 12 have bottom areas 11d and 12d located closer to the bottom portion 10b of the base member 10. The storage peripheral wall portions 11c and 12c of the storage compartments 11 and 12 have top areas 11e and 12e located closer to the top 10c of the base member 10. The storage peripheral wall portions 11c and 12c of the storage compartments 11 and 12 also have two lateral regions 11f and 12f located closer to the two lateral portions 10d of the base member 10, respectively.

The volumes of the plurality of storage compartments 11 and 12 can be substantially equal to each other. The cross-sectional areas of the plurality of storage compartments 11 and 12 orthogonal to the depth direction of the base member 10 can be substantially equal to each other. The frontal shapes of the plurality of storage compartments 11 and 12 can be substantially similar to each other. However, the present invention is not limited to these. For example, the volume in at least one of the plurality of storage compartments may be different from the volume in the other storage compartments. The cross-sectional area of at least one of the plurality of storage compartments may be different from the cross-sectional area of the other storage compartments. The front view shape of at least one of the plurality of storage compartments may be different from the front view shape of the other storage compartments.

As shown in FIGS. 1 to 3, each of the storage compartments 11 and 12 can be formed in a substantially square shape when viewed from the front. The storage compartments 11 and 12 can also be formed in a substantially square shape in front view. Each of the storage compartments 11 and 12 can extend in the depth direction of the base member 10 so as to have a substantially square cross section. The storage compartments 11 and 12 can also extend in the depth direction of the base member 10 so as to have a substantially square cross section. However, the front view shape of each storage compartment is not limited to a substantially square shape or a substantially square shape. For example, the front view shape of at least one of the plurality of storage compartments is formed so as to have a substantially polygonal shape, a substantially circular shape, a substantially semicircular shape, a substantially fan shape, and other geometric shapes. You can also do it.

The plurality of storage compartments 11 and 12 can be arranged in a matrix in a front view. In addition, in FIGS. 1 to 3, as an example, a structure including a base member 10 having 9 storage compartments 11 and 12 is shown, and 9 storage compartments 11 and 12 have 3 rows × They are arranged in a matrix of three rows. However, the plurality of storage compartments can be arranged in a pattern other than the matrix.

"Details of resonance space"
With reference to FIGS. 2 to 5, the resonance section 13 of the base member 10 can be configured in detail as follows. As shown in FIGS. 2 and 3, the resonance space 13a of one resonance compartment 13 is located closer to the back surface of the base member 10 with respect to the storage spaces 11a and 12a of all the storage compartments 11 and 12, and these storage spaces 11a. , 12a includes a space continuously provided so as to correspond to, 12a. In this case, the base member 10 can be configured to have one resonance compartment 13. However, the resonance space of one resonance compartment is continuous with respect to the two or more storage spaces that are a part of all the storage compartments so as to correspond to these two or more storage spaces near the back surface of the base member. It can also include the space provided in. In this case, the base member can be configured to have two or more resonance compartments.

As shown in FIGS. 2 to 5, the resonance peripheral wall portion 13b has a bottom area 13e located closer to the bottom portion 10b of the base member 10. The resonance peripheral wall portion 13b has a top region 13f located closer to the top 10c of the base member 10. The resonance peripheral wall portion 13b also has two lateral regions 13g located closer to the two lateral portions 10d of the base member 10, respectively.

The base peripheral wall portion 10a of the base member 10 includes all of the resonance peripheral wall portions 13b of the resonance section 13. The bottom portion 10b of the base peripheral wall portion 10a includes the bottom area 13e of the resonance peripheral wall portion 13b. The bottom portion 10b of the base peripheral wall portion 10a has a bottom area 13e of the resonance peripheral wall portion 13b. The top portion 10c of the base peripheral wall portion 10a includes the top region 13f of the resonance peripheral wall portion 13b. The lateral portion 10d of the base peripheral wall portion 10a includes the lateral region 13g of the resonance peripheral wall portion 13b. However, the base peripheral wall portion can also be configured to partially include the resonance peripheral wall portion.

The resonance peripheral wall portion 13b is included in the base peripheral wall portion 10a and has an outer region 13h facing the external space E. The through hole 13c is arranged in such an outer region 13h. The number, size, position, etc. of the through holes 13c can be appropriately changed so as to bring about the desired Helmholtz resonance. For example, as shown in FIGS. 2 to 5, when the outer region 13h includes the top region 13f and the two side regions 13g of the resonance peripheral wall portion 13b, the through hole 13c is the top region 13f and the two sides. It can be placed in a square area of 13 g. In this case, the through holes can also be placed in at least one of the top area and the two lateral areas.

"Details of partition plate"
With reference to FIGS. 2, 3 and 6, the partition plate 14 of the base member 10 can be configured in detail as follows. As shown in FIGS. 2 and 3, the partition plate 14 is formed so as to correspond to the storage peripheral wall portions 11c and 12c of the storage compartments 11 and 12 when viewed from the front. The gap G between the partition plate 14 and the storage peripheral wall portions 11c and 12c is formed along the entire circumferential direction of the storage peripheral wall portions 11c and 12c. However, such a gap can be formed along at least a part of the storage peripheral wall portion in the circumferential direction. The position, size, etc. of the gap G can be appropriately changed so as to bring about a desired Helmholtz resonance.

When the sound adjusting members 20 and 30 are the sound diffuser 20, the partition plate 14 is attached to the sound diffuser 20 via the additional sound absorbing cushion 40. However, such dividers can also be attached directly to the acoustic diffuser. When the sound adjusting members 20 and 30 are sound absorbing cushions 30, the partition plate 14 is attached to the sound absorbing cushions 30.

Further, as shown in FIG. 6, the partition plate 14 can be moved in the depth direction of the base member 10 together with the acoustic adjusting members 20 and 30 in a state of being attached to the acoustic adjusting members 20 and 30. By such movement of the partition plate 14, the size of the resonance space 13a can be adjusted so as to bring about a desired Helmholtz resonance. For example, when a plurality of partition plates 14 corresponding to the plurality of storage compartments 11 and 12 are provided, the positions of the base members 10 in the plurality of partition plates 14 in the depth direction may be different from each other.

"Details of acoustic adjustment member"
With reference to FIGS. 1 to 3, the acoustic adjusting members 20 and 30 can be configured in detail as follows. As shown in FIGS. 1 to 3, the acoustic adjusting members 20 and 30 occupy a part of the storage spaces 11a and 12a in the storage compartments 11 and 12 where the acoustic adjusting members 20 and 30 are installed in the depth direction. Be placed. However, the acoustic adjustment member may be arranged so as to occupy the entire depth direction of the storage space in the storage compartment in which the acoustic adjustment member is installed.

When the acoustic adjusting members 20 and 30 are acoustic diffusers 20, each columnar portion 21 of the acoustic diffuser 20 is formed in an elongated shape. The plurality of columnar portions 21 may extend in substantially the same direction as each other. Here, in the acoustic diffuser 20, the direction substantially the same as the depth direction of the base member 10 is defined as the thickness direction, the extending direction of the columnar portion 21 is defined as the vertical direction, and the thickness direction and the vertical direction are defined. A direction substantially orthogonal to a direction is defined as a lateral direction.

In particular, a state in which the vertical direction of the acoustic diffuser 20 substantially coincides with the height direction of the base member 10 is defined as a vertical installation state. When the acoustic diffuser 20 is placed vertically, the thickness direction, the longitudinal direction, and the lateral direction of the acoustic diffuser 20 substantially coincide with the depth direction, the height direction, and the width direction of the base member 10, respectively. Further, a state in which the vertical direction of the acoustic diffuser 20 substantially coincides with the width direction of the base member 10 is defined as a horizontal placement state. When the acoustic diffuser 20 is placed horizontally, the thickness direction, the longitudinal direction, and the lateral direction of the acoustic diffuser 20 substantially coincide with the depth direction, the width direction, and the height direction of the base member 10, respectively.

The acoustic diffuser 20 has two support portions 22 and 23 located at both ends in the vertical direction thereof, that is, a first support portion 22 and a second support portion 23. Both ends of each columnar portion 21 in the extending direction are connected to two support portions 22 respectively. Such a plurality of columnar portions 21 are arranged at intervals from each other. One end of the two support portions 22 and 23 in the lateral direction is arranged so as to substantially coincide with each other in the lateral direction. The other lateral ends of the two supports 22, 23 are also arranged so as to substantially coincide with each other in the lateral direction.

When the acoustic diffuser 20 is placed vertically, the first support portion 22 comes into contact with the bottom region 11d of the diffusion compartment 11. Further, the second support portion 23 may be arranged along the top area 11e of the diffusion section 11. When the acoustic diffuser 20 is placed horizontally, one end of the first and second support portions 22 and 23 in the lateral direction abuts on the bottom region 11d of the diffusion compartment 11. Further, the first and second support portions 22 and 23 may be arranged along the two lateral regions 11f of the diffusion compartment 11, respectively.

The acoustic diffuser 20 can be a columnar diffuser of the Acoustic Grove® System (AGS). The acoustic diffuser may also be configured to have a back surface portion located on the back surface side in the thickness direction with respect to the plurality of columnar portions.

Next, as shown in FIGS. 2 and 3, when the sound absorbing cushion 30 is a sound absorbing cushion 30, the sound absorbing cushion 30 is a cover arranged on the outer surface of the sound absorbing cushion 30 so as to form an internal space thereof. It has a part 31. The internal space of the sound absorbing cushion 30 is preferably a closed space surrounded by the cover portion 31.

Further, the sound absorbing cushion 30 has a sound absorbing portion 32 arranged in the internal space thereof. However, the sound absorbing cushion is not limited to this. For example, the sound absorbing cushion may be composed of only the sound absorbing portion without having the cover portion.

Here, in the sound absorbing cushion 30, substantially the same directions as the depth direction, the height direction, and the width direction of the base member 10 are defined as the depth direction, the height direction, and the width direction, respectively. The bottom portion 30a of the sound absorbing cushion 30 in the height direction comes into contact with the bottom region 12d of the sound absorbing compartment 12. The sound absorbing cushion 30 is supported in a state of being sandwiched by the bottom area 12d and the top area 12e of the sound absorbing section 12 in the height direction, or sandwiched by two side areas 12f of the sound absorbing section 12 in the width direction. be able to. The height-wise top 30b of the sound-absorbing cushion may be arranged along the top area 12e of the sound-absorbing compartment 12. The two widthwise side portions 30c of the sound absorbing cushion may be arranged along the two lateral regions 12f of the sound absorbing compartment 12, respectively.

Further, the cover portion 31 of the sound absorbing cushion 30 is preferably flexible. The cover portion 31 is preferably acoustically transparent. The cover portion 31 is preferably breathable. In particular, the cover portion 31 may be made of natural leather, synthetic leather, woven fabric, or non-woven fabric. However, the cover portion is not limited to this.

The sound absorbing portion 32 of the sound absorbing cushion 30 is made of a material having sound absorbing performance. For example, the material of the sound absorbing portion 32 can be glass wool. However, the material of the sound absorbing portion is not limited to this. The material of the sound absorbing part may be rock wool. The material of the sound absorbing portion may be a material made of resin fibers such as polyester fiber, PET (Polyethylene terephthalate) fiber, acrylic (Polymethylryl, PMMA) fiber, and polyimide (PI) fiber. The material of the sound absorbing portion may be a material containing glass wool, rock wool, the above resin fiber, or the like. The material of the sound absorbing portion may be a sponge material made of resin or the like. Further, the sound absorbing cushion may have an additional member between the cover portion and the sound absorbing portion. Such additional members are formed so as to surround a part or the whole of the sound absorbing portion. For example, the additional member can be a film or the like made of a corrugated cardboard plate, a rubber plate, aluminum foil, polyester or the like.

"Details of additional adjustment members"
With reference to FIGS. 2 and 3, the additional acoustic adjusting member 40 can be configured in detail as follows. The additional acoustic adjusting member 40 is arranged so as to occupy a part of the storage space 11a in the depth direction in the diffusion section 11 in which the acoustic adjusting member 20 is installed. When the additional sound absorbing cushion 40 is the additional sound absorbing cushion 40, the additional sound absorbing cushion 40 has a cover portion 41 arranged on the outer surface of the additional sound absorbing cushion 40 so as to form an internal space thereof. The internal space of the additional sound absorbing cushion 40 may be a closed space surrounded by the cover portion 41.

Further, the additional sound absorbing cushion 40 has a sound absorbing portion 42 arranged in the internal space thereof. However, the additional sound absorbing cushion is not limited to this. For example, the additional sound absorbing cushion may be composed of only the sound absorbing portion without having the cover portion.

Here, in the additional sound absorbing cushion 40, substantially the same directions as the thickness direction, the vertical direction, and the horizontal direction of the acoustic diffuser 20 are defined as the thickness direction, the vertical direction, and the horizontal direction, respectively. The additional sound absorbing cushion 40 may come into contact with the acoustic diffuser 20 in the thickness direction. Further, the additional sound absorbing cushion 40 is detachably attached to the sound diffuser 20. Further, it is preferable that a gap is formed between the additional sound absorbing cushion and the storage peripheral wall portion 11c of the diffusion section 11.

When the sound diffuser 20 is placed vertically, the thickness direction, the vertical direction, and the horizontal direction of the additional sound absorbing cushion 40 correspond to the sound diffuser 20, respectively, in the depth direction, the height direction, and the height direction of the base member 10. Approximately coincides in the width direction. When the acoustic diffuser 20 is placed horizontally, the thickness direction, the vertical direction, and the horizontal direction of the additional sound absorbing cushion 40 correspond to the acoustic diffuser 20, respectively, in the depth direction, the width direction, and the height of the base member 10. It almost matches the direction.

Further, the cover portion 41 of the additional sound absorbing cushion 40 may have flexibility. The cover portion 41 is preferably acoustically transparent. The cover portion 41 is preferably breathable. In particular, the cover portion 41 may be formed of natural leather, synthetic leather, woven fabric, or non-woven fabric. The material of the cover portion 41 of the additional sound absorbing cushion 40 may be the same as or different from the material of the cover portion 31 of the sound absorbing cushion 30. However, the cover portion is not limited to this.

The sound absorbing portion 42 of the additional sound absorbing cushion 40 is made of a material having sound absorbing performance. The material of the sound absorbing portion 42 of the additional sound absorbing cushion 40 may be the same as or different from the material of the sound absorbing portion 32 of the sound absorbing cushion 30. For example, the material of the sound absorbing portion 42 can be glass wool. However, the material of the sound absorbing portion is not limited to this. The material of the sound absorbing part may be rock wool. The material of the sound absorbing portion may be a material made of resin fibers such as polyester fiber, PET fiber, acrylic fiber, and polyimide fiber. The material of the sound absorbing portion may be a material containing glass wool, rock wool, the above resin fiber, or the like. The material of the sound absorbing portion may be a material containing glass wool, rock wool, the above resin fiber, or the like. The material of the sound absorbing portion may be a sponge material made of resin or the like. Further, the additional sound absorbing cushion may have an additional member between the cover portion and the sound absorbing portion. Such additional members are formed so as to surround a part or the whole of the sound absorbing portion. For example, the additional member can be a film or the like made of a corrugated cardboard plate, a rubber plate, aluminum foil, polyester or the like.

As described above, in the acoustic adjustment structure according to the present embodiment, the resonance frequency of the resonance space 13a formed so as to bring about Helmholtz resonance by the resonance partition 13 of the base member 10 can be easily set even in a low frequency region of about 100 Hz or less. Can be adjusted. In particular, by adjusting the number, size, position, etc. of the through holes 13c formed in the resonance peripheral wall portion 13b surrounding the resonance space 13a, the resonance frequency of the resonance space 13a can be easily adjusted even in the low frequency region. .. Further, by changing the types of the acoustic adjusting members 20 and 30 installed in the storage compartments 11 and 12 of the base member 10, the acoustic characteristics, particularly the acoustic characteristics in the middle and high frequency regions larger than about 100 Hz can be easily adjusted. be able to. Therefore, the acoustic characteristics in the low frequency region can be effectively adjusted, and by extension, the acoustic characteristics in any frequency region can be effectively adjusted. Further, on the back side of the base member 10 with respect to the storage spaces 11a and 12a of the storage compartments 11 and 12, the resonance space 13a can be hidden by the resonance peripheral wall portion 13b of the base member 10 and the partition plate 14, and further, the resonance space can be hidden. On the front side of the base member 10 with respect to 13a, the inorganic acoustic adjusting members 20 and 30 can be stored in the storage spaces 11a and 12a surrounded by the storage peripheral wall portions 11c and 12c of the base member 10. Therefore, the aesthetic appearance of the acoustic adjustment structure can be improved, and as a result, the aesthetic appearance of the acoustic adjustment chamber R in which the acoustic adjustment structure is installed, that is, the acoustic adjustment space can be improved.

In the acoustic adjustment structure according to the present embodiment, the resonance space 13a is closer to the back surface of the base member 10 with respect to the storage spaces 11a and 12a of two or more storage compartments 11 and 12 out of the plurality of storage compartments 11 and 12. Including a space continuously provided so as to correspond to these two or more storage spaces 11a and 12a. Therefore, the size of the resonance space 13a can be sufficiently secured, and as a result, the acoustic characteristics in the low frequency region of about 100 Hz or less can be easily adjusted by the resonance space 13a.

In the acoustic adjustment structure according to the present embodiment, the resonance section 13 has a back opening 13d that opens on the back surface of the base member 10 so as to open the resonance space 13a, and the back surface of the base member 10 is the base member. The back opening 13d is closed by the wall surface W in a state where the base member 10 is installed so as to be along the wall surface W provided outside the 10. Therefore, the resonance space 13a can be efficiently formed by utilizing the outer wall surface W of the base member 10, and as a result, the acoustic characteristics in the low frequency region can be effectively adjusted.

In the acoustic adjustment structure according to the present embodiment, a gap G is formed between the partition plate 14 and the storage peripheral wall portion 13c. Therefore, the acoustic characteristics of the resonance space 13a can be easily adjusted even in the low frequency region by the gap G.

In the acoustic adjustment structure according to the present embodiment, the partition plate 14 is supported by the acoustic adjustment members 20 and 30. Therefore, since the partition plate 14 can be installed together with the acoustic adjusting members 20 and 30, the resonance space 13a can be efficiently formed, and as a result, the acoustic characteristics in the low frequency region can be effectively adjusted. ..

"Second embodiment"
The acoustic adjustment structure according to the second embodiment will be described. Unless otherwise specified, when the components of the present embodiment are configured in the same manner as the corresponding components of the first embodiment, the same names and symbols as those of the components of the first embodiment are applied.

The acoustic adjustment structure according to the present embodiment is configured in the same manner as the acoustic adjustment structure according to the first embodiment, except that it has the following configuration instead of the configuration in which the back opening 13d is closed by the wall surface W. .. That is, as shown in FIG. 7, in the acoustic adjustment structure according to the present embodiment, the base member 10 has a back plate 15 formed so as to close the resonance space 13a on the back surface thereof. The back plate 15 is formed so as to correspond to the back opening 13d of the resonance section 13 in the rear view. The back opening 13d is closed by the back plate 15.

As described above, in the acoustic adjustment structure according to the present embodiment, the same effect as that of the acoustic adjustment structure according to the first embodiment is obtained except for the effect obtained based on the configuration in which the back opening 13d is closed by the wall surface W. be able to. Further, in the acoustic adjustment structure according to the present embodiment, the resonance space 13a can be efficiently formed by the back plate 15 of the base member 10, and as a result, the acoustic characteristics in the low frequency region are effectively adjusted. be able to.

"Third embodiment"
The acoustic adjustment structure according to the third embodiment will be described. Unless otherwise specified, when the components of the present embodiment are configured in the same manner as the corresponding components of the first embodiment, the same names and symbols as those of the components of the first embodiment are applied.

"Outline of acoustic adjustment structure"
An outline of the acoustic adjustment structure according to the present embodiment will be described with reference to FIGS. 8 to 12. The outline of the acoustic adjustment structure according to the present embodiment is the same as the outline of the acoustic adjustment structure according to the first embodiment. The correspondence between the components of the structure according to the present embodiment and the first embodiment is as follows.

As shown in FIGS. 8 to 10, the structure according to the present embodiment has a base member 50 corresponding to the base member 10 of the first embodiment. The structure also has a plurality of acoustic adjusting members 20, 30 like the structure according to the first embodiment. The base member 50 has a plurality of storage compartments 51 and 52 corresponding to the plurality of storage compartments 11 and 12 of the first embodiment, respectively. In this embodiment, the base member may have one storage compartment.

Regarding the storage compartments 51 and 52, the diffusion compartment 51 and the sound absorbing compartment 52 correspond to the diffusion compartment 11 and the sound absorbing compartment 12 of the first embodiment, respectively. The storage compartments 51 and 52 have storage spaces 51a and 52a and front openings 51b and 52b corresponding to the storage spaces 11a and 12a, the front openings 11b and 12b, and the storage peripheral walls 11c and 12c of the first embodiment, respectively. It also has storage peripheral wall portions 51c and 52c.

The base member 50 has a resonance compartment 53 corresponding to the resonance compartment 13 of the first embodiment. The resonance section 53 has a resonance space 53a and a resonance peripheral wall portion 53b corresponding to the resonance space 13a and the resonance peripheral wall portion 13b of the first embodiment, respectively. As shown in FIGS. 8 to 12, the resonance compartment 53 has a through hole 53c corresponding to the through hole 13c of the first embodiment. As shown in FIGS. 8 to 10, the base member 50 also has a partition plate 54 corresponding to the partition plate 14 of the first embodiment. The details of the partition plate 54 are also the same as the details of the partition plate 14 of the first embodiment.

Note that FIG. 8 shows, as an example, a structure having three storage compartments 51 and 52, specifically, two diffusion compartments 51 and one sound absorbing compartment 52. However, the number of storage compartments in the structure, as well as the number of diffusion and sound absorption compartments, is not limited to this. The structure can be configured to have at least one of a diffusion and sound absorbing compartments. The structure can also have only diffusion compartments. The structure can also have only sound absorbing compartments. The structure may also have a storage compartment in which no member is placed, in addition to at least one of the diffusion and sound absorbing compartments. Furthermore, the placement position of the diffusion and sound absorption compartments is also not limited to the placement position shown in FIG.

"Details of acoustic adjustment structure"
The details of the acoustic adjustment structure according to the present embodiment will be described with reference to FIGS. 9 and 10. That is, the acoustic adjustment structure according to the present embodiment can be configured in detail as follows. One resonance space 53a is a space provided so as to correspond to the storage spaces 51a and 52a of the storage compartments 51 and 52 near the back surface of the base member 50 with respect to the storage spaces 51a and 52a. Further, in one resonance section 53, the resonance peripheral wall portion 53b is formed so as to be continuous with the storage peripheral wall portions 51c and 52c in the depth direction of the base 50. The base member 50 has a plurality of resonance compartments 53 corresponding to all the storage spaces 51a and 52a. However, the base member can also have at least one resonance compartment corresponding to at least one compartment of all storage spaces.

Further, the details of the structure are the same as the details of the structure according to the first embodiment, as described below. The resonance compartment 53 has a back opening 53d corresponding to the back opening 13d of the first embodiment. The structure is installed in the acoustic adjustment room R in the same manner as the structure according to the first embodiment. Further, a gap G is formed between the partition plate 54 and the storage peripheral wall portions 51c and 52c. Further, the partition plate 54 is supported by the acoustic adjusting members 20 and 30. However, the partition plate can also be attached to the storage peripheral wall portion of the storage section of the base member.

"Details of base member"
With reference to FIGS. 8 to 12, the base member 50 can be configured in detail as follows. The details of the base member 50 are the same as the details of the base member 10 of the first embodiment. The correspondence between the components of the base member 50 according to the present embodiment and the base member 10 according to the first embodiment is as follows.

That is, the base member 50 has a base peripheral wall portion 50a corresponding to the base peripheral wall portion 10a of the first embodiment. The base peripheral wall portion 50a has a bottom portion 50b, a top portion 50c, and a side portion 50d corresponding to the bottom portion 10b, the top portion 10c, and the side portion 10d of the first embodiment, respectively.

"Details of storage compartment"
With reference to FIGS. 8 to 10, the storage compartments 51 and 52 of the base member 50 can be configured in detail as follows. The details of the storage compartments 51 and 52 are the same as the details of the storage compartments 11 and 12 of the first embodiment except for the arrangement thereof. Regarding the correspondence between the components of the storage compartments 51 and 52 according to the present embodiment and the storage compartments 11 and 12 according to the first embodiment, the storage peripheral wall portions 51c and 52c of the storage compartments 51 and 52 are the first. To have bottom areas 51d, 52d, top areas 51e, 52e, and side areas 51f, 52f corresponding to the bottom areas 11d, 12d, top areas 11e, 12e, and side areas 11f, 12f, respectively, of the first embodiment. It has become.

Regarding the arrangement of the storage compartments 51 and 52, all the storage compartments 51 and 52 are arranged so that at least a part of the storage peripheral wall portions 51c and 52c faces the external space E of the base member 50. However, some of all the storage compartments may be arranged so that at least a part of the storage peripheral wall portion faces the external space of the base member.

Further, the plurality of storage compartments 51 and 52 can be arranged in a matrix in a front view. When all the storage compartments 51 and 52 are arranged so that at least a part of the storage peripheral wall portions 51c and 52c faces the external space E of the base member 50, all the storage compartments 51 and 52 are arranged. It can be arranged in a matrix of 2 rows or more × 1 column, 2 rows or more × 2 columns, or 1 row × 2 columns or more. 8 to 10 show, as an example, a structure including a base member 50 having three storage compartments 51 and 52, and the three storage compartments 51 and 52 have 3 rows × 1 column. It is arranged in a matrix of.

When some of the storage compartments are arranged so that at least a part of the storage peripheral wall portion faces the external space of the base member, all the storage compartments have two or more rows × 3 It can be arranged in a matrix of columns or more. Further, the plurality of storage compartments can be arranged in a pattern other than the matrix.

"Details of resonance space"
With reference to FIGS. 8 to 12, the resonance section 53 of the base member 50 can be configured in detail as follows. As shown in FIGS. 9 and 10, the resonance peripheral wall portion 53b of the resonance compartment 53 has a bottom area 53e located closer to the bottom portion 50b of the base member 50. The resonance peripheral wall portion 53b has a top region 53f located closer to the top 50c of the base member 50. The resonance peripheral wall portion 53b also has two lateral regions 53g located closer to the two lateral portions 50d of the base member 50, respectively.

When the base member 50 has a plurality of storage compartments 11 and 12, the base peripheral wall portion 50a is configured to partially include the resonance peripheral wall portion 53b. When the base member has one storage compartment, the base member has one resonance compartment, and the base peripheral wall portion includes all of the resonance peripheral wall portions of one resonance compartment.

The resonance peripheral wall portion 53b is included in the base peripheral wall portion 50a and has an outer region 53h facing the external space E. The through hole 13c is arranged in such an outer region 53h. The number, size, position, etc. of the through holes 53c can be appropriately changed to bring about the desired Helmholtz resonance.

As described above, in the acoustic adjustment structure according to the present embodiment, the effect obtained based on the resonance space 13 including the space continuously provided so as to correspond to the two or more storage spaces 11a and 12a is excluded. The same effect as that of the acoustic adjustment structure according to the first embodiment can be obtained. Further, in the acoustic adjustment structure according to the present embodiment, one resonance space 53a is located closer to the back surface of the base member 50 with respect to the storage spaces 51a, 52a of one storage compartment 51, 52. It is a space provided so as to correspond to 52a, and in one resonance section 53, the resonance peripheral wall portions 53b are formed so as to be continuous with the storage peripheral wall portions 51c and 52c in the depth direction of the base 50. Therefore, the resonance space 53a can be efficiently hidden by the resonance peripheral wall portion 53b and the partition plate 54 on the back side of the base member 50 with respect to the storage spaces 51a and 52a of the storage compartments 51 and 52.

"Fourth embodiment"
The acoustic adjustment structure according to the fourth embodiment will be described. Unless otherwise specified, when the components of the present embodiment are configured in the same manner as the corresponding components of the third embodiment, the same names and symbols as those of the components of the third embodiment are applied.

The acoustic adjustment structure according to the third embodiment is configured in the same manner as the acoustic adjustment structure according to the third embodiment, except that it has the following configuration instead of the configuration in which the back opening 53d is closed by the wall surface W. .. That is, as shown in FIG. 13, in the acoustic adjustment structure according to the present embodiment, the base member 50 has a plurality of back plates 55 formed so as to close the plurality of resonance spaces 53a on the back surface thereof. .. The plurality of back plates 55 are formed so as to correspond to the back openings 53d of the plurality of resonance compartments 53 in the rear view. The plurality of back openings 53d are each closed by the plurality of back plates 55.

However, the plurality of back openings can also be closed by a single back plate. Also, if the base member has one resonance compartment, the base member can have one back plate that closes the back opening of such one resonance compartment.

As described above, in the acoustic adjustment structure according to the present embodiment, the same effect as that of the acoustic adjustment structure according to the third embodiment is obtained except for the effect obtained based on the configuration in which the back opening 53d is closed by the wall surface W. be able to. Further, in the acoustic adjustment structure according to the present embodiment, the resonance space 53a can be efficiently formed by the back plate 55 of the base member 50, and as a result, the acoustic characteristics in the low frequency region are effectively adjusted. be able to.

Although the embodiments of the present invention have been described so far, the present invention is not limited to the above-described embodiments, and the present invention can be modified and modified based on the technical idea thereof.

The relationship between the acoustic frequency and the sound absorption coefficient in the acoustic adjustment structure according to the examples and the comparative examples is measured based on JIS A 1409 “Method for measuring the sound absorption coefficient by the reverberation room method”, and the relationship between these acoustic frequencies and the sound absorption coefficient. Was compared. In the following, the structures according to these Examples and Comparative Examples, the relationship between the acoustic frequency and the sound absorption coefficient in these structures, and the comparison result of the relationship between the acoustic frequency and the sound absorption coefficient will be described.

"Example"
The acoustic adjustment structure according to the embodiment was configured as follows based on the acoustic adjustment structure according to the first embodiment described above. The base member of the structure according to the first embodiment had eight storage compartments, specifically, four diffusion compartments and four sound absorbing compartments. The base member has a first row element in which three storage compartments are arranged in the width direction of the base member at the position closest to the top, and two at a position below the first row element and adjacent to the first row element. A second row element in which one storage compartment is arranged in the width direction of the base member, and three storage compartments are arranged in the width direction of the base member at a position adjacent to the second row element below the second row element. It had a third line element.

Each of the first row and third row elements has one diffusion compartment 11 located in the center of the base member in the width direction and two adjacent diffusion compartments on both sides of the base member in the width direction with respect to this one diffusion compartment. It had a sound absorbing compartment. The second row element had two diffusion compartments adjacent to each other in the width direction of the base member. In the width direction of the base member, the centers of the first to third row elements were substantially aligned with each other. In each diffusion compartment, the acoustic diffuser was placed vertically, but no additional sound absorbing cushion was placed. A sound absorbing cushion was placed in each sound absorbing section. The cover of the sound absorbing cushion was made of synthetic leather, specifically vinyl leather.

Further, the resonance section of the base member is formed in a substantially quadrangular shape when viewed in the depth direction of the base member. The width of the resonance compartment substantially corresponded to the width of the first and third row elements of the base member. The height of the resonance compartment substantially corresponded to the height of the base member. A plurality of through holes were formed in the top area and the two side areas of the resonance peripheral wall portion in the resonance section. The eight storage compartments and the resonance compartment were separated by one partition plate. One partition plate was formed in a substantially quadrangular shape so as to correspond to the resonance section when viewed in the depth direction of the base member. The structure according to such an embodiment was arranged in the reverberation room so that the back opening of the resonance section was closed by the wall surface of the reverberation room.

"Comparison example"
The acoustic adjustment structure according to the comparative example was configured in the same manner as the acoustic adjustment structure according to the embodiment, except that it did not have a resonance partition and one partition plate. The structure according to such a comparative example was arranged in the reverberation room so that the back surfaces of the eight storage compartments were in contact with the wall surface of the reverberation room.

The relationship between the acoustic frequency and the sound absorption coefficient in the acoustic adjustment structure according to these Examples and Comparative Examples was as shown in FIG. In FIG. 14, the vertical axis Y indicates the sound absorption coefficient, the vertical axis X indicates the acoustic frequency (Hz), the solid line L1 indicates the result of the example, and the broken line L2 indicates the result of the comparative example. In the state where no element such as an acoustic adjustment structure is installed in the reverberation room, the sound absorption coefficient is about 0 (zero) at each frequency.

Comparing the relationship between the acoustic frequency and the sound absorption coefficient in the acoustic adjustment structure according to the example and the comparative example, the sound absorption coefficient of the example is the comparative example in the entire measured frequency range of about 63 Hz to about 4000 Hz. It increased with respect to the sound absorption coefficient. Then, regarding the amount of increase in the sound absorption coefficient of the example with respect to the sound absorption coefficient of the comparative example, the amount of increase in the sound absorption coefficient of the example in the medium frequency region of about 100 Hz to about 1000 Hz is the example in the high frequency region of about 1000 Hz to about 4000 Hz. It was larger than the amount of increase in the sound absorption coefficient of. Further, the amount of increase in the sound absorption coefficient of the example in the low frequency region of about 63 Hz to about 100 Hz was larger than the amount of increase in the sound absorption coefficient of the example in the medium and high frequency region of about 100 Hz to about 1000 Hz. That is, the amount of increase in the sound absorption coefficient of the example in the low frequency region of about 63 Hz to about 100 Hz was particularly larger than the amount of increase in the sound absorption coefficient of the example in the medium and high frequency region of about 100 Hz to about 4000 Hz.

The increase in the sound absorption coefficient of the example in the high frequency region was due to the fact that the surface area of the structure according to the example was larger than the surface area of the structure according to the comparative example due to the presence of the resonance partition. Further, the increase in the sound absorption coefficient of the example in the low to medium frequency region is that the surface area of the structure according to the example is larger than the surface area of the structure according to the comparative example due to the presence of the resonance partition, and that the resonance partition It was due to Helmholtz resonance. In particular, the sound absorption coefficient of the example in the low frequency region was more strongly influenced by the Helmholtz resonance in the resonance section than the sound absorption coefficient of the example in the middle frequency region. Therefore, it was confirmed that the acoustic characteristics in the low to medium frequency region, particularly the acoustic characteristics in the low frequency region, can be effectively adjusted by the acoustic adjustment structure and its resonance partition.

10,50 ... Base member, 11,51 ... Diffusion compartment (storage compartment), 12,52 ... Sound absorption compartment (storage compartment), 11a, 12a, 51a, 52a ... Storage space, 11b, 12b, 51b, 52b ... Front opening Parts, 11c, 12c, 51c, 52c ... Storage peripheral wall, 13,53 ... Resonance compartment, 13a, 53a ... Resonance space, 13b, 53b ... Resonant peripheral wall, 13c, 53c ... Through hole, 13d, 53d ... Back opening , 14, 54 ... Partition plate, 15, 55 ... Back plate 20 ... Acoustic diffuser (acoustic adjusting member), 30 ... Sound absorbing cushion (acoustic adjusting member)
G ... Gap E ... External space, W ... Side wall surface (wall surface)

Claims (7)

Acoustic adjustment members configured to change the characteristics of the input sound,
It is provided with a base member including a storage section having a storage space that allows the acoustic adjustment member to be detachably stored.
The storage compartment has a front opening that opens so as to open the storage space in front of the base member in the depth direction, and a storage peripheral wall portion that surrounds the storage space in the height direction and the width direction of the base member. It is an acoustic adjustment structure having and
The base member includes a resonance compartment configured to allow the formation of a resonance space that results in Helmholtz resonance.
The resonance space of the resonance compartment includes a space provided so as to correspond to the storage space of the storage compartment at the back side in the depth direction of the base member with respect to the storage space of the storage compartment.
A partition plate is provided to partition the storage space of the storage compartment from the resonance space of the resonance compartment.
The resonance section has a resonance peripheral wall portion that surrounds the resonance space in the height direction and the width direction of the base member.
An acoustic adjustment structure in which a through hole penetrating the resonance peripheral wall portion is formed so as to communicate the resonance space with the external space of the base member. The base member includes a plurality of the storage compartments.
A space in which the resonance space is continuously provided with respect to the storage space of two or more storage compartments among the plurality of storage compartments so as to correspond to the two or more storage spaces near the back surface of the base member. The acoustic adjustment structure according to claim 1, wherein the acoustic adjustment structure comprises. The resonance space is a space provided so as to correspond to the storage space of the storage section near the back surface of the base member.
The acoustic adjustment structure according to claim 1, wherein the resonance peripheral wall portion is formed so as to be continuous with the storage peripheral wall portion in the depth direction of the base. The resonance compartment has a back opening that opens on the back of the base member to open the resonance space.
The first aspect of the present invention, wherein the back opening is closed by the wall surface in a state where the base member is installed so that the back surface of the base member is aligned with a wall surface provided outside the base member. Acoustic adjustment structure. The acoustic adjustment structure according to claim 1, wherein the base member has a back plate formed on the back surface thereof so as to close the resonance space. The acoustic adjustment structure according to claim 1, wherein a gap is formed between the partition plate and the storage peripheral wall portion. The acoustic adjustment structure according to claim 1, wherein the partition plate is supported by the acoustic adjustment member.

Images