JP2015178717A - acoustic structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide technological means capable of making the acoustic space inside visually unconfirmative from the acoustic space outside, when desiring to make a state in an acoustic space secret, while being capable of imparting a sufficient opening feeling to a person in the acoustic space by sufficiently taking the external light in the acoustic space even if an acoustic structure is installed in the acoustic space.SOLUTION: A plurality of pipe 21 are formed by an upper plate 11, an intermediate plate 13 and an upper partition plate 14 large in light transmissivity. A plurality of pipe 23 are formed by a lower plate 12 and the intermediate plate 13 large in light transmissivity and a lower partition plate 15 small in light transmissivity. When increasing a quantity of light taken in the acoustic space, the upper plate 11 is fixed to a wall surface by folding up the upper partition plate 14 and the upper plate 11, and when reducing the quantity of light taken in the acoustic space, the lower plate 12 is fixed to the wall surface by folding up the lower partition plate 15 and the lower plate 12.

Description

  The present invention relates to an acoustic structure that prevents acoustic disturbance in an acoustic space and tunes the sound in the acoustic space to a comfortable sound.

  There is an acoustic structure in which a plurality of acoustic tubes are arranged in a direction perpendicular to the longitudinal direction. Each of the plurality of acoustic tubes of the acoustic structure is provided with an opening that communicates the cavity contained in the acoustic tube to the outside. And the some acoustic tube is arranged so that each opening part may become the same direction. This type of acoustic structure is disclosed in Patent Document 1, for example. The acoustic structure is attached to a wall surface of an acoustic space (for example, a conference room) and adjusts the sound in the acoustic space to a comfortable sound.

JP 2010-84509 A

  By the way, there are conference rooms partitioned by transparent glass walls and transparent glass partitions. Such a conference room has an advantage that external light can be taken into the conference room to brighten the conference room. In addition, since a person inside the conference room can visually recognize the outside of the conference room, there is also an advantage that a feeling of openness can be given to the person inside the conference room. On the other hand, there is a case where it is desired not to visually recognize the conference room from outside the conference room. In this case, a transparent glass wall or a transparent glass partition is covered with a curtain or the like to conceal the state of the conference room.

  When installing an acoustic structure in such a conference room, it is also conceivable to attach the acoustic structure to the glass surface of a transparent glass wall or a transparent glass partition. If an acoustic structure is attached to the glass surface, the glass surface is obscured by the acoustic structure, so that the inside of the conference room can be kept secret. However, in this case, since the external light incident through the glass surface is shielded by the acoustic structure, the conference room cannot be sufficiently brightened. Moreover, since the glass surface is covered with the acoustic structure, it is difficult for a person in the conference room to visually recognize the outside of the conference room and cannot obtain a sufficient open feeling. Therefore, if the acoustic structure is attached to the glass surface, the advantage of partitioning the conference room with a transparent glass wall or a transparent glass partition cannot be fully utilized.

  The present invention has been made in view of the circumstances as described above, and even when the acoustic structure is installed in the acoustic space, the external light is sufficiently taken into the acoustic space, and a feeling of openness sufficient for people in the acoustic space. For the purpose of providing technical means capable of preventing the inside of the acoustic space from being viewed from outside the acoustic space when the state in the acoustic space is to be kept secret Yes.

  The present invention includes an opening that communicates an internal cavity to the outside, and includes a plurality of acoustic tubes arranged in a direction perpendicular to the longitudinal direction so that the openings are in the same direction, Provided is an acoustic structure characterized in that the amount of light transmitted through an acoustic tube is variable.

  According to the present invention, when the acoustic structure is installed in the acoustic space, the amount of light incident on the acoustic space from outside the acoustic space via the acoustic tube can be changed. Therefore, if the amount of light transmitted through the acoustic tube is increased, external light can be sufficiently taken into the acoustic space to give a sufficient sense of openness to the person in the acoustic space and transmitted through the acoustic tube. If the amount of light to be reduced is reduced, the inside of the acoustic space cannot be viewed from outside the acoustic space.

It is the front view and sectional drawing which show the structure of the acoustic structure 1 which is 1st Embodiment of this invention. FIG. 3 is a cross-sectional view of the acoustic structure 1 when the upper partition plate 14 of the acoustic structure 1 is held in a state parallel to the middle plate 13. FIG. 3 is a cross-sectional view of the acoustic structure 1 when the lower partition plate 15 of the acoustic structure 1 is held in a state parallel to the middle plate 13. It is the front view, side view, and sectional drawing which show the structure of 1 A of acoustic structures which are 2nd Embodiment of this invention. A front view, a side view, and a side view showing the configuration of the acoustic structure 1A when the flip 41A of the acoustic structure 1A is held in a state perpendicular to the parallel direction of the pipe 31A and perpendicular to the longitudinal direction of the pipe 31A. It is sectional drawing. It is the front view, side view, and sectional drawing which show the structure of the acoustic structure 1B which is 3rd Embodiment of this invention. A front view, a side view, and a side view showing the configuration of the acoustic structure 1B when the flip 41B of the acoustic structure 1B is held in a state perpendicular to the parallel direction of the pipe 31A and perpendicular to the longitudinal direction of the pipe 31A. It is sectional drawing. It is the front view, side view, and sectional drawing which show the structure of 1 C of acoustic structures which are 4th Embodiment of this invention. It is the front view, side view, and sectional drawing which show the structure of acoustic structure 1D which is 5th Embodiment of this invention.

Embodiments of the present invention will be described below with reference to the drawings.
<First Embodiment>
FIG. 1A is a front view showing the configuration of the acoustic structure 1 according to the first embodiment of the invention, and FIG. 1B is a cross-sectional view taken along the line AA ′ of the acoustic structure 1. . FIGS. 1A and 1B omit the left and right portions of the acoustic structure 1 when the acoustic structure 1 is viewed from the front. The acoustic structure 1 includes an upper plate 11, a lower plate 12, an intermediate plate 13, an upper partition plate 14, a lower partition plate 15, a side plate 16 and a side plate 17.

  The upper plate 11, the lower plate 12, and the middle plate 13 are plates having the same shape (for example, a rectangle). An intermediate plate 13 is arranged between the upper plate 11 and the lower plate 12, and the upper plate 11, the lower plate 12 and the intermediate plate 13 are arranged in parallel. A plurality of upper partition plates 14 are provided between the upper plate 11 and the middle plate 13. The upper partition plate 14 is a rectangular plate. Each of the upper partition plates 14 is arranged in parallel with a predetermined interval, and is arranged perpendicular to the upper plate 11 and the middle plate 13. A plurality of rectangular tube-shaped pipes (that is, acoustic tubes) 21 including the cavity 22 are formed by the upper plate 11, the middle plate 13 and the adjacent upper partition plate 14. Side plates 16 are disposed at both ends of the pipe 21 in the longitudinal direction.

  Similarly, a plurality of lower partition plates 15 are provided between the lower plate 12 and the middle plate 13. The lower partition plate 15 is also a rectangular plate. Each of the lower partition plates 15 is arranged in parallel with a predetermined interval, and is arranged perpendicular to the lower plate 12 and the middle plate 13. A plurality of rectangular pipes (that is, acoustic tubes) 23 that enclose the cavity 24 are formed by the lower plate 12, the intermediate plate 13, and the adjacent lower partition plate 15. Side plates 17 are disposed at both ends of the pipe 23 in the longitudinal direction. The number of pipes 21 and the number of pipes 23 may be the same or different.

  The shape of the cavity 22 when the pipe 21 is cut along a plane perpendicular to the longitudinal direction of the pipe 21 formed by the upper plate 11, the middle plate 13 and the adjacent upper partition plate 14 is substantially square. Similarly, the shape of the cavity 24 when the pipe 23 is cut along a plane perpendicular to the longitudinal direction of the pipe 23 formed by the lower plate 11, the middle plate 13 and the adjacent lower partition plate 14 is also substantially square. . The dimension of the cavity 22 and the dimension of the cavity 24 may be the same or different.

  The light transmittance of the upper plate 11, the lower plate 12, the middle plate 13, and the upper partition plate 14 is increased. Specifically, the upper plate 11 or the like has a large ratio of the amount of light emitted from the back surface (or front surface) to the amount of light incident on the front surface (or back surface). More specifically, the upper plate 11 and the like are formed by molding a transparent synthetic resin such as an acrylic resin. Further, it is preferable that the upper plate 11 and the like have a high light transmittance at least for visible light. This is to make it possible for a person in the acoustic space to visually recognize the outside of the acoustic space via the upper plate 11 and the like and to give a feeling of openness to the person in the acoustic space.

  On the other hand, the light transmittance of the lower partition plate 15 is small. Specifically, the lower partition plate 15 has a small ratio of the amount of light emitted from the back surface (or front surface) to the amount of light incident on the front surface (or back surface). More specifically, the lower partition plate 15 is formed by molding a colored synthetic resin, for example. The color of the lower partition plate 15 is, for example, the same color as the color of the wall surface (for example, ivory or the like). The color of the lower partition plate 15 is not limited to this. Moreover, it is preferable that the lower partition plate 15 is a thing with the small light transmittance with respect to at least visible light. This is to prevent the inside of the acoustic space from being visually recognized from outside the acoustic space by the lower partition plate 15.

  The upper plate 11 is provided with a plurality of openings 25 penetrating the front and back. The opening 25 is provided so that one opening 25 is provided for one pipe 21. The opening 25 allows the cavity 22 included in the pipe 21 to communicate with the outside. As a result, the pipe 21 is formed with a resonance tube having the opening 25 as an open end and the one side plate 16 as a closed end, and a resonance tube having the opening 25 as an open end and the other side plate 16 as a closed end. The The position of the opening 25 in the longitudinal direction of the pipe 21 may be different or the same for each pipe 21.

  Similarly, the lower plate 12 is provided with a plurality of openings 26 penetrating the front and back. The opening 26 is provided so that one opening 26 is provided for one pipe 23. The opening 26 allows the cavity 24 included in the pipe 23 to communicate with the outside. As a result, the pipe 23 is formed with a resonance tube having the opening 26 as an open end and the one side plate 17 as a closed end, and a resonance tube having the opening 26 as an open end and the other side plate 17 as a closed end. The The position of the opening 26 in the longitudinal direction of the pipe 23 may be different or the same for each pipe 23. Further, the opening 25 and the opening 26 are provided symmetrically with respect to the intermediate plate 13. The position of the opening 25 and the position of the opening 26 may or may not be related.

  A movable portion connected to the middle plate 13 is provided at an end portion on the middle plate 13 side of the upper partition plate 14 (not shown). The movable part of the upper partition plate 14 is a rotation axis parallel to the longitudinal direction of the upper partition plate 14 and forms a rotation axis parallel to the longitudinal direction of the pipe 21, and the upper partition plate 14 is directed toward the middle plate 13. This is a member for rotational movement. The movable part of the upper partition plate 14 is formed of, for example, an elastic member such as rubber and can be expanded and contracted. When the movable part of the upper partition plate 14 is not expanded or contracted, the upper partition plate 14 is held in a state perpendicular to the middle plate 13. Further, the upper partition plate 14 can be held in a state parallel to the middle plate 13 by expanding and contracting the movable portion of the upper partition plate 14 and rotating the upper partition plate 14 toward the middle plate 13. FIG. 2 is a cross-sectional view taken along line AA ′ of FIG. 1A when the upper partition plate 14 is held in a state parallel to the middle plate 13. In this case, since the upper partition plate 14 is adjacent to the middle plate 13 as shown in FIG. In this case, the upper plate 11 is held by the plate surface of the upper partition plate 14. That is, in the acoustic structure 1, the upper partition plate 14 and the upper plate 11 can be folded by tilting the upper partition plate 14.

  Similarly, a movable portion connected to the intermediate plate 13 is provided at an end portion of the lower partition plate 15 on the intermediate plate 13 side (not shown). The movable part of the lower partition plate 15 is a rotation axis parallel to the longitudinal direction of the lower partition plate 15 and forms a rotation axis parallel to the longitudinal direction of the pipe 23, so that the lower partition plate 15 is directed toward the middle plate 13. This is a member for rotational movement. Similarly to the movable part of the upper partition plate 14, the movable part of the lower partition plate 15 is formed of an elastic member such as rubber and can be expanded and contracted. When the movable part of the lower partition plate 15 is not stretched, the lower partition plate 15 is held in a state perpendicular to the middle plate 13. Further, the lower partition plate 15 can be held in parallel with the middle plate 13 by expanding and contracting the movable part of the lower partition plate 15 and rotating the lower partition plate 15 toward the middle plate 13. FIG. 3 is a cross-sectional view taken along line AA ′ of FIG. 1A when the lower partition plate 15 is held in a state parallel to the middle plate 13. In this case, as shown in FIG. 3, the cavity 24 is filled because the lower partition plate 15 is adjacent to the middle plate 13. In this case, the lower plate 12 is held by the plate surface of the lower partition plate 15. That is, in the acoustic structure 1, the lower partition plate 15 and the lower plate 12 can be folded by tilting the lower partition plate 15.

In addition, the movable part of the upper partition plate 14 and the movable part of the lower partition plate 15 are not limited to those formed by an elastic member. The movable part of the upper partition plate 14 and the movable part of the lower partition plate 15 form at least pipes 21 and 23, while folding the upper partition plate 14 and the lower partition plate 15 so as to be parallel to the middle plate 13. Anything that makes it possible. Further, it is preferable that the entire upper partition plate 14 or the entire lower partition plate 15 is not formed by an elastic member. When the entire upper partition plate 14 and the entire lower partition plate 15 are formed of an elastic member, the bending rigidity of the pipe walls in the pipes 21 and 23 is reduced. This is because the sound corresponding to the resonance frequency cannot be appropriately retained in the pipes 21 and 23, and the scattering effect and the sound absorption effect in the vicinity of the openings 25 and 26 are reduced.
The above is the configuration of the acoustic structure 1.

Next, a usage mode of the acoustic structure 1 will be described.
The user installs the acoustic structure 1 on a glass surface of the partition in a conference room (that is, an acoustic space) partitioned by a transparent glass partition, for example. When installing the acoustic structure 1, the user installs the acoustic structure 1 depending on how the amount of light entering the conference room from the outside of the conference room through the glass surface of the partition and the acoustic structure 1 is desired. Change aspects. This will be described in more detail. When the user wants to increase the amount of light that enters the conference room from outside the conference room, the user rotates the upper partition plate 14 so as to be parallel to the middle plate 13 and tilts the upper partition plate 14 and the upper plate 11. Collapse (see Figure 2). And the surface (outer surface) of the upper board 11 is fixed to the glass surface of a partition. In addition, what is necessary is just to perform fixing to a glass surface with an adhesive agent, a double-sided adhesive tape, etc., for example. In this case, the lower partition plate 15 is perpendicular to the middle plate 13 and the pipe 23 is formed. When the acoustic structure 1 is installed in this way, light incident on the upper plate 11 from the outside of the conference room through the glass surface of the partition passes through the upper plate 11, the upper partition plate 14, and the middle plate 13, respectively. The light that has passed through them travels through the cavity 24, passes through the lower plate 12, and is emitted into the conference room. That is, the light incident on the acoustic structure 1 from outside the conference room through the glass surface is radiated into the conference room without being blocked by the acoustic structure 1.

  Further, when the upper plate 11 is fixed to the glass surface, the opening 26 of the lower plate 12 faces the conference room. In this case, the sound radiated from the conference room toward the acoustic structure 1 is scattered and absorbed in the vicinity of the opening 26. As a result, the sound in the conference room is tuned to a sound that is comfortable to listen to.

  On the other hand, when it is desired to reduce the amount of light that enters the conference room from outside the conference room, the user turns the lower partition plate 15 so as to be parallel to the middle plate 13 and tilts the lower partition plate 15 and the lower plate. 12 is folded (see FIG. 3). And the surface (outer surface) of the lower board 12 is fixed to the glass surface of a partition. In this case, the upper partition plate 14 is perpendicular to the middle plate 13 and the pipe 21 is formed. When the acoustic structure 1 is installed in this manner, light incident on the lower plate 12 from outside the conference room through the glass surface of the partition passes through the lower plate 12 and proceeds to the lower partition plate 15. Since the lower partition plate 15 having a low light transmittance lies in parallel with the lower plate 12 and the middle plate 13 (that is, lies in a direction perpendicular to the direction in which light is incident), the lower partition plate 15. Most of the light that travels in the direction is reflected in the direction of the glass surface of the partition. For this reason, when the acoustic structure 1 is installed in this way, the amount of light incident from the outside of the conference room into the conference room is smaller than when the lower partition plate 15 is perpendicular to the middle plate 13. Further, since the amount of light transmitted through the acoustic structure 1 (specifically, the lower partition plate 15) is small, it is difficult to visually recognize the conference room from outside the conference room via the acoustic structure 1.

  When the lower plate 12 is fixed to the glass surface, the opening 25 of the upper plate 11 faces the conference room. In this case, the sound radiated from the conference room toward the acoustic structure 1 is scattered and absorbed in the vicinity of the opening 25. As a result, the sound in the conference room is tuned to a sound that is comfortable to listen to.

  Thus, in the acoustic structure 1 according to the present embodiment, by folding the upper partition plate 14 and the upper plate 11, the acoustic structure 1 is perpendicular to the parallel direction of the plurality of pipes 23 and perpendicular to the longitudinal direction of the plurality of pipes 23. The amount of light that arrives from any direction and passes through the plurality of pipes 23 can be increased, while the lower partition plate 14 and the lower plate 12 are folded to be perpendicular to the parallel direction of the plurality of pipes 21; The amount of light that arrives from a direction perpendicular to the longitudinal direction of the plurality of pipes 21 and passes through the plurality of pipes 21 can be reduced. That is, the amount of light that is perpendicular to the parallel direction of the plurality of acoustic tubes and that is transmitted from the direction perpendicular to the longitudinal direction of the plurality of acoustic tubes and passes through the plurality of acoustic tubes (in other words, the light of the acoustic structure 1). (Transmissivity) is variable. More specifically, in the acoustic structure 1, the side surfaces of the plurality of pipes 21 and 23 (more specifically, the direction perpendicular to the parallel direction of the plurality of acoustic tubes and the longitudinal direction of the plurality of acoustic tubes) The ratio of the projection of the portion with the low light transmittance to the projection of the portion with the high light transmittance on the projection plane whose normal is the vertical direction) is the rotation of the portion with the low light transmittance relative to the portion with the high light transmittance. Is variable. For this reason, when the acoustic structure is installed in the acoustic space so that the parallel direction of the plurality of acoustic tubes is parallel to the wall surface of the acoustic space, the light that enters the acoustic space from outside the acoustic space through the acoustic structure The amount of can be changed. In addition, the acoustic structure 1 includes the case where the lower partition plate is perpendicular to the middle plate and the ratio of the projection of the portion having the low light transmittance to the projection of the portion having the high light transmittance is reduced, and In any case where the ratio of the projection of the portion with the low light transmittance to the projection of the portion with the high light transmittance parallel to the plate is increased, the sound in the acoustic space can be obtained as in the conventional acoustic structure. Tuning to a comfortable sound. That is, in the acoustic structure 1 according to the present embodiment, the amount of light transmitted through the acoustic structure 1 can be changed without affecting the sound adjustment effect. Therefore, according to the present acoustic structure, external light can be sufficiently taken into the acoustic space without affecting the articulation effect, and a sufficient open feeling can be given to the person in the acoustic space. When it is desired to keep the inside state secret, the inside of the acoustic space cannot be viewed from outside the acoustic space.

Second Embodiment
FIG. 4A is a front view showing an acoustic structure 1A according to the second embodiment of the present invention. FIG. 4B is a side view showing the configuration of the acoustic structure 1A when the acoustic structure 1A is viewed from below in the front view of FIG. FIG. 4C is a cross-sectional view taken along the line BB ′ of the acoustic structure 1A.

  The acoustic structure 1A has a panel shape in which a plurality (five in FIG. 4) of rectangular pipes 31A are arranged in parallel and coupled. Each of the pipes 31A includes a cavity 32A. The shape of the cavity 32A in the cut surface when the pipe 31A is cut along a plane perpendicular to the longitudinal direction of the pipe 31A is substantially square. One end of the pipe 31A in the longitudinal direction is closed by a side plate 33A, and the other end is closed by a side plate 34A. The number of pipes constituting the acoustic structure 1A is not limited to five.

  Openings 35A are provided on the front side of the pipe 31A. The opening 35A allows the cavity 32A to communicate with a space outside the pipe 31A (ie, an acoustic space). As a result, a resonance tube having the opening 35A as the open end and the side plate 33A as the closed end and a resonance tube having the opening 35A as the open end and the side plate 34A as the closed end are formed in the pipe 31A. The position of the opening 35A in the longitudinal direction of the pipe 31A may be different or the same in each pipe 31A.

  Flip 41A is provided in each pipe 31A. The flip 41A is a rectangular plate member. The longitudinal direction of the flip 41A overlaps the longitudinal direction of the pipe 31A. The length of the flip 41A in the longitudinal direction is slightly shorter than the distance between the inner surface of the side plate 33A and the inner surface of the side plate 34A. Further, the cut surface perpendicular to the longitudinal direction of the flip 41A is substantially rectangular. The dimension of the long side of the flip 41A on the cut surface is slightly shorter than the distance between the opposing inner surfaces of the pipe 31A.

  A cylindrical shaft portion 43A is provided at one end in the longitudinal direction of the flip 41A, and a cylindrical shaft portion 44A is provided at the other end. The shaft portions 43A and 44A are provided at positions near one short side of the surface perpendicular to the longitudinal direction of the flip 41A.

  On the inner side surface of the side plate 33A, a groove for receiving the shaft portion 43A is provided (not shown). The groove of the side plate 33A is provided at a position near one corner on the side of the surface facing the surface where the opening 35A is provided in the region surrounded by the pipe 31A. In the example of FIG. 4, when the inner surface of the side plate 33A is viewed with the surface on which the opening 35A is provided facing upward, the groove of the side plate 33A is located near the lower right corner in the region surrounded by the pipe 31A. In the position.

  The side plate 34A is provided with a through hole through which the shaft portion 44A is inserted (not shown). The through hole of the side plate 34A is provided at the same position as the groove of the side plate 33A. In the example of FIG. 4, when the outer surface of the side plate 34A is viewed with the surface where the opening 35A is provided facing upward, the through hole of the side plate 34A is located near the lower right corner of the region surrounded by the pipe 31A. In the position. Since the shaft portion 43A is accommodated in the groove of the side plate 33A and the shaft portion 44A is inserted into the through hole of the side plate 34A, the flip 41A is rotatable in the pipe 31A with the shaft portion 43A and the shaft portion 44A as the rotation shaft. Retained. Hereinafter, when the flip 41A is held in a state parallel to the parallel direction of the pipe 31A, the surface on the opening 35A side of the flip 41A is referred to as the surface of the flip 41A, and the surface opposite to the surface is the surface of the flip 41A. Called the back side.

  A rod-like lever 45A is fixed to the tip end of the shaft portion 44A protruding into the outer space through the through hole. The tip of the shaft portion 44A is fixed to the position of the side surface in the vicinity of one end in the longitudinal direction of the lever 45A. The lever 45A is fixed in such a posture that its longitudinal direction is parallel to the long side direction of the cut surface perpendicular to the longitudinal direction of the flip 41A. For this reason, the lever 45A is rotatable about the shaft portion 44A as a rotation axis. As the lever 45A rotates, the flip 41A also rotates.

  The light transmittance of the pipe 31A is large. Specifically, the pipe 31A is formed by molding a transparent synthetic resin such as an acrylic resin, for example, similarly to the upper plate 11 and the like in the first embodiment. On the other hand, the light transmittance of the flip 41A is small. Specifically, the flip 41A is formed by molding, for example, a colored synthetic resin, similarly to the lower partition plate 15 in the first embodiment.

  As in the first embodiment, the acoustic structure 1A according to the present embodiment is installed on a glass surface of the partition in a conference room partitioned by a transparent glass partition. At this time, the user turns the opening 35A into the conference room (in the acoustic space) and puts the back surface portion of the acoustic structure 1A (the portion facing the front portion where the opening 31A is provided) on the glass surface. Fix it. First, a case where the flip 41A is held in a state parallel to the parallel direction of the pipe 31A (see FIG. 4) will be described. When light is incident on the back surface portion of the acoustic structure 1A from outside the conference room via the glass surface of the partition, the incident light is transmitted through the back surface portion of the acoustic structure 1A. Since the flip 41A lies in the parallel direction of the pipe 31A, the light transmitted through the back surface portion of the acoustic structure 1A travels to the back surface of the flip 41A. Since the light transmittance of the flip 41A is low, most of the light traveling on the back surface of the flip 41A is reflected in the direction of the glass surface of the partition. Therefore, in this case, the amount of light transmitted through the flip 41A and transmitted through the front portion of the acoustic structure 1A and emitted into the conference room is smaller than the amount of light incident on the acoustic structure 1A. In this case, since the amount of light transmitted through the acoustic structure 1A (specifically, the flip 41A) is small, it is difficult to visually recognize the conference room from outside the conference room via the acoustic structure 1A.

  In a state where the flip 41A is parallel to the parallel direction of the pipe 31A, when the user rotates the lever 45A about 90 degrees in the clockwise direction when the outer surface of the side plate 34A is viewed, the flip 41A is connected to the pipe 31A. And in a state perpendicular to the longitudinal direction of the pipe 31A. FIG. 5A is a front view showing the configuration of the acoustic structure 1A at this time. FIG. 5B is a side view showing the configuration of the acoustic structure 1A when the acoustic structure 1A is viewed from below in the front view of FIG. FIG. 5C is a cross-sectional view taken along the line CC ′ of the acoustic structure 1A. In this case, since the flip 41A does not lie in the parallel direction of the pipe 31A, most of the light transmitted through the back surface portion of the acoustic structure 1A does not hit the flip 41A. Then, most of the light transmitted through the back portion of the acoustic structure 1A is transmitted through the cavity 32A and the front portion of the acoustic structure 1A and radiated into the conference room. That is, in this case, light incident on the acoustic structure 1A from the outside of the conference room via the glass surface is radiated into the conference room without being blocked by the acoustic structure 1A.

  When the flip 41A is perpendicular to the parallel direction of the pipe 31A and perpendicular to the longitudinal direction of the pipe 31A, the user turns the lever 45A counterclockwise when viewing the outer surface of the side plate 34A. By rotating about 90 degrees in the direction, the flip 41A can be returned to a state parallel to the parallel direction of the pipe 31A. Further, the user adjusts the rotation angle of the lever 45A so that the state parallel to the parallel direction of the pipe 31A and the state perpendicular to the parallel direction of the pipe 31A and perpendicular to the longitudinal direction of the pipe 31A are obtained. The flip 41A can be held in the intermediate state.

  As described above, the acoustic structure 1A according to the present embodiment includes the plate-like flip 41A having a light transmittance lower than that of the pipe 31A. Then, the light transmittance on the side surface of the plurality of pipes 31A (more specifically, a projection plane that is a direction perpendicular to the parallel direction of the pipes 31A and a direction perpendicular to the longitudinal direction of the pipes 31A). The ratio of the projection of the portion with a small light transmittance to the projection of the portion with a large is variable by the rotation of the flip 41A with respect to the pipe 31A. In addition, the acoustic structure 1A holds the flip 41A in a state parallel to the parallel direction of the pipe 31A, and increases the ratio of the projection of the portion with low light transmittance to the projection of the portion with high light transmittance. In any case where 41A is held in a state perpendicular to the parallel direction of the pipes 31A and the ratio of the projection of the portion with low light transmittance to the projection of the portion with high light transmittance is reduced, the acoustic structure 1A from the acoustic space is reduced. The sound emitted toward the sound is scattered and absorbed in the vicinity of the opening 35A of the acoustic structure 1A, and the sound in the acoustic space is tuned to a comfortable sound. For this reason, also in this embodiment, the effect similar to 1st Embodiment is acquired. In the acoustic structure 1A according to the present embodiment, it is not necessary to fix the acoustic structure 1A to the glass surface when adjusting the amount of light transmitted through the acoustic structure 1A.

<Third Embodiment>
The acoustic structure 1B according to the third embodiment of the present invention is a modification of the acoustic structure 1A according to the second embodiment. FIG. 6A is a front view showing the acoustic structure 1B according to the present embodiment. FIG. 6B is a side view showing the configuration of the acoustic structure 1B when the acoustic structure 1B is viewed from below in the front view of FIG. 6A. FIG. 6C is a cross-sectional view taken along the line DD ′ of the acoustic structure 1B. The acoustic structure 1B according to the present embodiment is the acoustic structure according to the second embodiment in that a side plate 33B is provided instead of the side plate 33A, a side plate 34B is provided instead of the side plate 34A, and a flip 41B is provided instead of the flip 41A. Different from 1A.

  The side plate 33B is different from the side plate 33A according to the second embodiment (not shown) in the position of the groove that accommodates the shaft portion 43A. The groove of the side plate 33B is provided at a position near one corner on the surface side where the opening 35A is provided in the region surrounded by the pipe 31A. In the example of FIG. 6, when the inner surface of the side plate 33B is viewed with the surface on which the opening 35A is provided facing upward, the groove of the side plate 33B is positioned near the upper right corner in the region surrounded by the pipe 31A. Is provided.

  The side plate 34B is different from the side plate 34A according to the second embodiment in the position of the through hole through which the shaft portion 44A is inserted. The through hole of the side plate 34B is provided at the same position as the groove of the side plate 33B. In the example of FIG. 6, when the outer surface of the side plate 34B is viewed with the surface on which the opening 35A is provided facing upward, the through hole of the side plate 34B is located near the upper right corner of the region surrounded by the pipe 31A. Is provided.

  The flip 41B is different from the flip 41A according to the second embodiment in that an opening 37B penetrating the front and back is provided. The opening 37B of the flip 41B is provided at the same position as the opening 35A of the pipe 31A, and has the same opening shape and opening size. More specifically, when the flip 41B is in a posture parallel to the opening 35A, the opening 35A and the opening 37B appear to overlap when the opening 35A and the opening 37B are viewed from the front. . The opening 37B of the flip 41B is a member having a small light transmittance and is covered with a member that allows sound to pass through easily. Specifically, the opening 37B is covered with a colored cloth (for example, a cloth having the same color as the flip 41B). The opening 37B may not be covered with a colored cloth or the like.

  The user installs the acoustic structure 1B in the same manner as in the second embodiment. When the user operates the lever 45A so that the lever 45A is parallel to the parallel direction of the pipe 31A, the flip 41B is held parallel to the parallel direction of the pipe 31A on the front portion side in the pipe 31A. In this case, the light transmitted through the back surface portion of the acoustic structure 1B travels through the cavity 32A and travels to the back surface of the flip 41B. Since the light transmittance of the flip 41B is low, most of the light traveling to the back surface of the flip 41B is reflected in the direction of the glass surface of the partition. Therefore, in this case, the amount of light radiated into the conference room via the acoustic structure 1B is reduced. In this case, since the opening 35A and the opening 37B overlap, the sound radiated from the acoustic space toward the acoustic structure 1B is scattered and absorbed by the opening 35A and the opening 37B. .

  In a state where the flip 41B is parallel to the parallel direction of the pipe 31A, when the user rotates the lever 45A about 90 degrees counterclockwise when viewing the outer surface of the side plate 34B, the flip 41B It is held in a state perpendicular to the parallel direction of 31A and perpendicular to the longitudinal direction of the pipe 31A. FIG. 7A is a front view showing the acoustic structure 1B at this time. FIG. 7B is a side view showing the configuration of the acoustic structure 1B when the acoustic structure 1B is viewed from below in the front view of FIG. 7A. FIG. 7C is a cross-sectional view taken along the line EE ′ of the acoustic structure 1B. The case of being held in this way is the same as in the second embodiment.

  The acoustic structure 1B according to the present embodiment is a second embodiment except that the flip 41B is positioned on the front portion side in the pipe 31A when the flip 41B is held parallel to the parallel direction of the pipe 31A. Since it is the same as the acoustic structure 1A according to the form, the same effect as that of the second embodiment can be obtained in this embodiment.

<Fourth embodiment>
An acoustic structure 1C according to the fourth embodiment of the present invention includes a main body 1C1 and a light shielding plate 1C2. FIG. 8A is a front view showing the configuration of the main body 1C1 according to the present embodiment. FIG. 8B is a side view showing the configuration of the main body 1C1 when the main body 1C1 is viewed from below in the front view of FIG. 8A. FIG. 8C is a side view showing the configuration of the main body 1C1 when the main body 1C1 is viewed from above in the front view of FIG. 8A. FIG. 8D is a cross-sectional view taken along line FF ′ of the main body 1C1. FIG. 8E is a front view showing the configuration of the light shielding plate 1C2 of the acoustic structure 1C. FIG. 8F is a side view showing the configuration of the light shielding plate 1C2 of the acoustic structure 1C. The acoustic structure 1C adjusts the amount of light transmitted through the acoustic structure 1C by the light shielding plate 1C2.

  In the main body 1C1, the flip 41A, the shaft portion 43A, the shaft portion 44A and the lever 45A are deleted, a pipe 31C is provided instead of the pipe 31A, a side plate 33C is provided instead of the side plate 33A, and a side plate 34C is provided instead of the side plate 34A. In that respect, it differs from the acoustic structure 1A according to the second embodiment. The pipe 31C is different from the pipe 31A according to the second embodiment in that a slit 51C is provided. The side plate 33C is different from the side plate 33A in that the groove for accommodating the shaft portion 43A is omitted. The side plate 34C is different from the side plate 34A in that the through hole that passes through the shaft portion 44A is deleted and an opening 52C of the slit 51C is further provided.

  The slit 51C is provided in the back surface portion (portion facing the front surface portion where the opening 35A is provided) of the pipe 31C. The slit 51C is a cavity whose cut surface in the direction perpendicular to the longitudinal direction of the pipe 31C is rectangular. The slit 51C is provided from the vicinity of the pipe 31C at one end in the parallel direction of the pipe 31C to the vicinity of the pipe 31C at the other end. The slit 51C is provided from the vicinity of one end in the longitudinal direction of the pipe 31C to the vicinity of the other end. The slit 51C communicates with the space outside the main body 1C1 through the opening 52C of the side plate 34C. That is, the slit is a gap extending in the parallel direction of the pipe 31C and partially communicating with the outside.

  The light shielding plate 1C2 is a rectangular plate member. The dimension of the light shielding plate 1C2 is slightly smaller than the dimension of the slit 51C of the main body 1C1. The light shielding plate 1C2 is accommodated in the slit 51C by the user. That is, the slit 51C is provided to hold the light shielding plate 1C2 on the main body 1C1. The light shielding plate 1C2 is detachable from the main body 1C1. In the acoustic structure 1C, a plurality of types of light shielding plates 1C2 having different light transmittances are prepared. For example, a translucent light shielding plate 1C2 and a colored light shielding plate 1C2 are prepared.

  The light transmittance of the main body 1C1 is large. Specifically, the main body 1C1 is formed by molding a transparent synthetic resin such as an acrylic resin, for example, similarly to the pipe 31A in the second embodiment. On the other hand, the light transmittance of the light shielding plate 1C2 is small. Specifically, the light shielding plate 1C2 is formed by molding, for example, a colored synthetic resin, similarly to the flip 41A in the second embodiment.

  The user places the main body 1C1 of the acoustic structure 1C on the glass surface of the conference room partitioned by a transparent glass partition, for example, and the opening 35A in the conference room, similarly to the acoustic structure 1A of the second embodiment. Install in the state of facing. At this time, the side plate 33C having the opening 52C is installed so as to be on the upper side. The user inserts one light shielding plate 1C2 selected by the user from a plurality of types of light shielding plates 1C2 into the slit 51C through the opening 52C. In a state where the light shielding plate 1C2 is inserted into the slit 51C, when light is incident on the back surface portion of the main body 1C1 from the outside of the conference room through the glass surface, the incident light is transmitted through the back surface portion of the main body 1C1 and the light shielding plate. Proceed to the back of 1C2. Since the light transmittance of the light shielding plate 1C2 is low, most of the light traveling to the back surface of the light shielding plate 1C2 is reflected in the glass surface direction of the partition. Therefore, in this case, the amount of light transmitted through the light shielding plate 1C2 and transmitted through the cavity 32A and the front portion of the main body 1C1 and radiated into the conference room is reduced.

  On the other hand, when it is desired to increase the amount of light emitted into the conference room, the user takes out the light shielding plate 1C2 from the slit 51C. In a state where the light shielding plate 1C2 is taken out from the slit 51C, when light enters the back surface portion of the main body 1C1 from the outside of the conference room via the glass surface, the incident light passes through the main body portion 1C1 and the slit 51C. The light transmitted through the slit 51C is further transmitted through the cavity 32A and the front portion, and is emitted into the conference room. Therefore, in this case, the light outside the conference room is taken into the conference room with almost no light shielding by the acoustic structure 1C (more precisely, the main body 1C1).

  As described above, the acoustic structure 1C according to the present embodiment has the side surfaces of the plurality of pipes 31C (more specifically, the direction perpendicular to the parallel direction of the pipes 31C and the direction perpendicular to the longitudinal direction of the pipes 31C). The main body 1C1 has a slit for detachably holding the light-shielding plate 1C2 on the main body 1C1 so as to change the ratio of the projection of the low light transmittance portion to the projection of the high light transmittance portion on the projection plane with the normal line as the normal line. It is provided. In addition, the acoustic structure 1C takes the light shielding plate 1C2 out of the slit when the light shielding plate 1C2 is accommodated in the slit 51C to increase the ratio of the projection of the portion having the low light transmittance to the projection of the portion having the high light transmittance. In any case where the ratio of the projection of the portion with the low light transmittance to the projection of the portion with the high light transmittance is reduced, the sound radiated from the acoustic space toward the acoustic structure 1C is opened in the acoustic structure 1C. The sound in the acoustic space is tuned to a comfortable sound by scattering and absorbing sound near the portion 35A. The acoustic structure 1C is the same as the acoustic structure 1A according to the second embodiment except that the amount of light transmitted through the acoustic structure 1C is adjusted by making the light shielding plate 1C2 detachable from the main body 1C1. Since it is the same, also in this embodiment, the effect similar to 2nd Embodiment is acquired. In addition, the user can adjust the light extraction amount outside the conference room in more detail by selecting the light shielding plate 1C2 having a desired light transmittance from among the plurality of types of light shielding plates 1C2.

  In addition, you may provide the light-shielding plate 1C2 or the main body 1C1 with the mechanism for making it easy to attach or detach the light-shielding plate 1C2 with respect to the main body 1C1. For example, a handle portion protruding outward from the opening 52C of the side plate 33C is provided on the light shielding plate 1C2. Further, a plurality of types of light shielding plates 1C2 may not be prepared. This is because the light transmittance of the acoustic structure 1C can be changed if at least one light shielding plate 1C2 is prepared.

<Fifth Embodiment>
An acoustic structure 1D according to the fifth embodiment of the present invention is a modification of the acoustic structure 1C according to the fourth embodiment. The acoustic structure 1D according to the present embodiment is different from the acoustic structure 1C according to the fourth embodiment in that a main body 1D1 is provided instead of the main body 1C1, and a light shielding plate 1D2 is provided instead of the light shielding plate 1C2. FIG. 9A is a front view showing the configuration of the main body 1D1 according to the present embodiment. FIG. 9B is a side view showing the configuration of the main body 1D1 when the main body 1D1 is viewed from below in the front view of FIG. 9A. FIG. 9C is a side view showing the configuration of the main body 1D1 when the main body 1D1 is viewed from above in the front view of FIG. 9A. FIG. 9D is a cross-sectional view taken along the line GG ′ of the main body 1D1. FIG. 9E is a front view showing the configuration of the light shielding plate 1D2. FIG. 9F is a side view showing the configuration of the light shielding plate 1D2.

  The main body 1D1 is different from the main body 1C1 in that a pipe 31D is provided instead of the pipe 31C, and a side plate 33D is provided instead of the side plate 33C. The pipe 31D is different from the pipe 31C in that a slit 51D is provided instead of the slit 51C, and an opening 35D is provided instead of the opening 35A. The slit 51D is different from the slit 51C in that it is provided in the front portion of the pipe 31D. The opening 35D is different from the opening 35A in that the cavity 32A communicates with the external space through the slit 51D. The side plate 33D is different from the side plate 33C in that an opening 52D is provided instead of the opening 52C. The opening 52D is different from the opening 52C in that it is provided on the front side of the pipe 31D. The slit 51D communicates with a space outside the main body 1D1 through the opening 52D of the side plate 33D.

  The light shielding plate 1D2 is different from the light shielding plate 1C2 in that a plurality of openings 53D penetrating the front and back surfaces are provided. The opening 53D of the light shielding plate 1D2 is provided at the same position as the opening 35D of the pipe 31D, and has the same opening shape and opening size. More specifically, when the opening 35D and the opening 53D are viewed from the front in a state where the light shielding plate 1D2 is accommodated in the slit 51D, the opening 35D and the opening 53D appear to overlap. Further, the opening 53D may be covered with a cloth or the like, similarly to the opening 37B of the third embodiment.

  When it is desired to reduce the amount of light transmitted through the acoustic space, the user opens one light shielding plate 1D2 selected by the user from a plurality of types of light shielding plates 1D2, as in the acoustic structure 1C according to the fourth embodiment. It inserts into slit 51D from part 52D. At this time, the light shielding plate 1D2 is inserted into the slit 220D in such a posture that the opening 53D of the light shielding plate 1D2 overlaps with the opening 35D. On the other hand, when it is desired to increase the amount of light transmitted through the acoustic space, the user takes out the light shielding plate 1D2 from the slit 51D as in the acoustic structure 1C according to the fourth embodiment.

  The acoustic structure 1D is the same as the acoustic structure 1C according to the fourth embodiment except that the position at which the light shielding plate 1D2 is attached to and detached from the main body 1D1 is different. Therefore, the fourth embodiment is also the fourth embodiment. The same effect can be obtained.

<Other embodiments>
Although the first to fifth embodiments of the present invention have been described above, other embodiments are conceivable for the present invention. For example:

(1) In each of the above embodiments, the lower partition plate 15 and the flips 41A and 41B having different light transmittances from the other parts are moved, or the light shielding plates 1C2 and 1D2 having different light transmittances from the main bodies 1C1 and 1D1 are used as the main body 1C1 and The direction perpendicular to the parallel direction of the pipes 21, 23 and 31A to 31D of the acoustic structures 1 to 1D by being attached to the 1D1, and the direction perpendicular to the longitudinal direction of the pipes 21, 23 and 31A to 31D The amount of light arriving from and passing through the pipes 21, 23 and 31A to 31D was changed. However, a method of changing the amount of light arriving from a direction perpendicular to the parallel direction of the pipe and perpendicular to the longitudinal direction of the pipe and passing through the pipe (in other words, the light transmittance of the acoustic structure is changed). The method of changing) is not limited to these. For example, a liquid crystal panel may be provided on the back portion of the acoustic structure. In this embodiment, the amount of light transmitted through the liquid crystal is changed by changing the liquid crystal alignment by applying a voltage or the like to the liquid crystal panel. In addition, for example, a device that generates bubbles may be provided on the back portion of the acoustic structure. Most of the light that enters the bubble is scattered. For this reason, in this aspect, the amount of light transmitted through the bubble generating device is changed according to the amount of generation of bubbles.

(2) In the said 1st Embodiment, the cross-sectional shape of the cavities 22 and 24 when the pipes 21 and 23 were cut | disconnected by the surface perpendicular | vertical to the longitudinal direction in the pipes 21 and 23 was substantially square. However, the cross-sectional shape of the cavity may not be substantially square. For example, it may be a rectangle or a parallelogram. This is because the light transmittance of the acoustic structure can be changed by folding the upper partition plate 14 and the lower partition plate 15, and the sound adjustment effect of the acoustic structure is not changed.

(3) In the acoustic structures 1A and 1B according to the second and third embodiments, the flips 41A and 41B are rotated according to the operation of the lever 45A by the user. However, the mode of rotating the flips 41A and 41B is not limited to this. For example, an electric motor rotor such as a stepping motor may be connected to the flip, and the flip may be rotated by applying electric power to the electric motor to rotate the electric motor rotor. In this case, for example, the rotation angle (posture) of the flip may be controlled by controlling the number of pulses of the pulsed power applied to the stepping motor.

(4) In the acoustic structures 1A and 1B according to the second and third embodiments, one lever 45A is provided for one flip 41A and 1B, and the flips 41A and 41B are provided for each flip 41A and 41B. It was possible to rotate independently. However, the acoustic structure is not limited to one that can rotate flips independently for each flip, and may be one that can rotate a plurality of flips in conjunction with each other. In this case, there may be a plurality of sets of flips to be linked, or all flips may be linked. Further, a flip that can be rotated independently and a flip that can be rotated in conjunction with a plurality of flips may be mixed.

(5) The acoustic structures 1C and 1D according to the fourth and fifth embodiments have the slits 51C and 51D that hold the light shielding plates 1C2 and 1D2 in the main bodies 1C1 and 1D1, respectively. However, the means for holding the light shielding plate on the main body is not limited to the slit. For example, you may provide the hook which hooks and hold | maintains a light-shielding plate on the outer wall of the front part of a main body. In this case, similarly to the light shielding plate 1D2 of the fifth embodiment, by providing an opening in the light shielding plate, the amount of light transmitted through the acoustic structure can be adjusted without impairing the sound adjustment function. A means for holding the light shielding plate may be provided on the light shielding plate. For example, a hook is provided on the light shielding plate and the hook is hooked on the upper side plate of the main body. The member for adjusting the amount of light that is held by the main body and passes through the acoustic structure is not limited to a plate-shaped light shielding plate. For example, cloth or the like may be used as a member for adjusting the amount of light transmitted through the acoustic structure. In this aspect, a hook may be provided on the cloth, and a groove or the like for hooking the hook may be provided on the outer wall of the front portion of the main body.

(6) Each of the plurality of lower partition plates 15 of the first embodiment has the same light transmittance. However, each of the plurality of lower partition plates 15 may have a different light transmittance. Similarly, each of the plurality of flips 41A and 41B in the second and third embodiments may have the same or different light transmittance. In addition, the light shielding plates 1C2 and 1D2 in the fourth and fifth embodiments may have the same light transmittance as a whole, or a part thereof may have a light transmittance different from other portions.

(7) In the fourth and fifth embodiments, a plurality of types of light shielding plates 1C2 and 1D2 having different light transmittances are prepared. However, a plurality of types of plates having different designs (for example, patterns and colors) may be prepared, and one plate selected by the user from among the plurality of types of plates may be inserted into the slit. In this aspect, the acoustic structure can be one of the interiors.

(8) In the first embodiment, the upper partition plate 14 and the upper plate 11 are folded when increasing the amount of light incident from outside the conference room into the conference room. However, in this case, the upper partition plate 14 and the upper plate 11 are not necessarily folded. This is because the amount of light transmitted through the acoustic structure 1 is not different from the case where the upper partition plate 14 and the upper plate 11 are folded without folding the upper partition plate 14 and the upper plate 11.

(9) The acoustic structures 1 to 1D of the above-described embodiments are obtained by facing one-side open pipes. However, the acoustic structure having a means for adjusting the amount of light transmitted through the acoustic structure is not limited to the one in which the pipes on one side open are faced. For example, the technical features of the present invention may be added to an arrangement of pipes that are open on one side. For example, the technical features of the present invention may be added to a Helmholtz resonator.

(10) The acoustic structures 1 to 1D according to the above embodiments may be installed in the acoustic space so that the longitudinal direction of the pipe is the longitudinal direction, or acoustically such that the longitudinal direction of the pipe is the lateral direction. It may be installed in the space.

  1, 1A, 1B, 1C, 1D ... acoustic structure, 11 ... upper plate, 12 ... lower plate, 13 ... middle plate, 14 ... upper partition plate, 15 ... lower partition plate, 16, 17, 33A, 34A, 33B , 34B, 33C, 34C, 33D, 34D ... side plate, 21, 23, 31A, 31C, 31D ... pipe, 22, 24, 32A ... hollow, 25, 26, 35A, 35D, 37B, 52C, 52D, 53D ... opening Part, 41A, 41B ... flip, 43A, 44A ... shaft part, 45A ... lever, 51C, 51D ... slit, 1C1, 1D1 ... main body, 1C2, 1D2 ... light shielding plate.

Claims (5)

It has an opening that communicates the internal cavity to the outside, and has a plurality of acoustic tubes arranged in a direction perpendicular to the longitudinal direction so that the opening is in the same direction,
An acoustic structure having a variable amount of light transmitted through the plurality of acoustic tubes. A light transmitting portion having a large light transmittance;
A plate-shaped light shielding portion having a light transmittance smaller than that of the light transmitting portion,
In the light shielding portion, a rotation axis parallel to the longitudinal direction of the plurality of acoustic tubes is provided along the longitudinal direction,
The acoustic structure according to claim 1, wherein the light shielding portion is rotatable with respect to the light transmitting portion. An upper plate,
A lower plate parallel to the upper plate;
A middle plate that is parallel to the upper plate and the lower plate and is disposed between the upper plate and the lower plate;
A plurality of upper partition plates which are arranged at a predetermined interval between the upper plate and the middle plate and form a plurality of acoustic tubes together with the upper plate and the middle plate;
A plurality of lower partition plates disposed at a predetermined interval between the lower plate and the middle plate;
The upper plate, the lower plate, the middle plate, and the plurality of upper partition plates are the light transmission portions,
The plurality of lower partition plates are the light shielding portions,
A plurality of acoustic tubes are formed by the lower plate, the middle plate, and the plurality of lower partition plates, while the plurality of lower partition plates are parallel to the middle plate by rotation of the plurality of lower partition plates. The acoustic structure according to claim 2, wherein a plurality of lower partition plates are folded. The plurality of acoustic tubes are the light transmission parts,
The acoustic structure according to claim 2, wherein the light shielding portion is provided in the plurality of acoustic tubes. A main body having the plurality of acoustic tubes having a high light transmittance;
A light shielding portion having a light transmittance smaller than that of the main body,
2. The acoustic structure according to claim 1, wherein the main body or the light shielding part is provided with a light shielding part holding means for detachably holding the light shielding part on the main body.

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