Enclosure, work box, external mounting member and porous unit

Abstract

To facilitate reduction of energy of sound generated inside an enclosure.SOLUTION: In an enclosure 1, a porous unit 5 having two or more porous surfaces 51 with a plurality of open holes is arranged so as to face a corner part provided inside the enclosure. A first porous surface 51a and a second porous surface 51b of the porous unit are located to form an angle. The first porous surface and a corner configuration surface that is one of corner configuration surfaces as components of the corner part and is located in a penetrating direction of a hole provided in the first porous surface, are located separately from each other, and the second porous surface and a corner configuration surface that is one of corner configuration surfaces as components of the corner part and is located in a penetrating direction of a hole provided in the second porous surface, are located separately from each other. The enclosure 1 comprises a space between the first porous surface and the corner part, and between the second porous surface and the corner part, in which sound that has traveled to the corner part side through the holes on the porous surfaces can travel.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a housing, a work box, an external mounting member, and a multi-hole unit. [Background technology]

[0002] As described in Patent Document 1, it is known to provide a soundproofing material in a work box to prevent the voices of people working inside the work box from leaking out. Also, as described in Patent Document 2, it is known to provide a sound-absorbing material in a cabinet to prevent the noise of electric and electronic equipment stored in the cabinet from leaking out. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2020-51163 A [Patent Document 2] JP 2019-165077 A

[0004] Incidentally, in the technology of the above-mentioned document, soundproofing material or sound absorbing material is provided on the side surfaces surrounding a housing such as a work box or cabinet, etc. However, sound generated inside the housing is likely to be reflected at the corners inside the housing, increasing the sound level and causing the risk of leakage to the outside. Summary of the Invention [Problem to be solved by the invention]

[0005] The inventors of the present invention have made extensive research into this issue and have attempted to solve the problem. The problem that the present invention aims to solve is to facilitate the reduction of the energy of sound generated inside the housing. [Means for solving the problem]

[0006] In order to solve the above problem, a housing having an internal space formed by using a panel is provided, in which a porous unit having two or more porous surfaces with a plurality of open holes is arranged to face a corner portion provided inside the housing, a first porous surface and a second porous surface of the porous unit are positioned to form an angle, the first porous surface and a corner constituent surface which is one of the corner constituent surfaces that is a component of the corner portion and is located in the penetrating direction of the holes provided in the first porous surface are positioned apart, and the second porous surface and a corner constituent surface which is one of the corner constituent surfaces that is a component of the corner portion and is located in the penetrating direction of the holes provided in the second porous surface are positioned apart, and the housing has spaces between the first porous surface and the corner portion and between the second porous surface and the corner portion through which sound that has moved toward the corner portion through the holes in the porous surface can move.

[0007] It is also preferable that at least one of the corner-forming surfaces facing the multi-hole unit is a surface that the panel has.

[0008] It is also preferable that the porous unit has holes of different sizes.

[0009] Moreover, the porous unit is preferably configured such that imaginary lines passing through the centers of the holes in the porous surface in the penetrating direction do not intersect with each other.

[0010] Moreover, the housing is a work box equipped with a door body that allows people to enter and exit an enclosed work space that can be used as a working room, and a desk on which the person works, and it is preferable that the porous unit be configured to be installed above the desk provided in the work space.

[0011] Furthermore, it is preferable that the external mounting member has an internal space and is attached to the outside of a housing that stores electric / electronic devices, and a porous unit having two or more porous surfaces with a plurality of open holes is arranged to face a corner portion provided inside the external mounting member, the first porous surface and the second porous surface of the porous unit are positioned to form an angle, the first porous surface and the corner component surface, which is one of the corner component surfaces that is a component of the corner portion and is located in the penetrating direction of the holes provided in the first porous surface, are positioned apart, and the second porous surface and the corner component surface, which is one of the corner component surfaces that is a component of the corner portion and is located in the penetrating direction of the holes provided in the second porous surface, are positioned apart, and the external mounting member has spaces between the first porous surface and the corner portion and between the second porous surface and the corner portion through which sound that has moved toward the corner portion through the holes in the porous surface can move.

[0012] Also, the porous unit is preferably installed to face a corner portion provided inside a housing having an internal space formed by using a panel, the porous unit comprising: a first porous surface having a plurality of open holes; a second porous surface located at an angle to the first porous surface and having a plurality of open holes; a first non-porous surface located away from the first porous surface in the penetration direction of the holes provided in the first porous surface; and a second non-porous surface located away from the second porous surface in the penetration direction of the holes provided in the second porous surface, and a space through which sound that has traveled through the holes in the porous surface can travel is located between the first porous surface and the first non-porous surface, and between the second porous surface and the second non-porous surface. Effect of the Invention

[0013] The present invention makes it possible to easily reduce the energy of sound generated inside the housing. [Brief description of the drawings]

[0014] [Figure 1] FIG. 2 is a perspective view of a work box according to an embodiment. [Diagram 2]This is a diagram showing an example in which a continuous multi-hole unit is arranged from the desk to the ceiling at each of two corners of the housing of the work box shown in Figure 1. However, the ceiling part, the door, the front panel, and the right side panel are omitted. [Diagram 3] This is a diagram showing an example in which two perforated units are placed in each of the two corners of the housing of the work box shown in Figure 1, and the spaces between them are filled with materials. However, the ceiling, door, front panel, and right side panel are omitted. [Figure 4] This is a diagram showing an example in which two perforated units are arranged in each of the two corners of the housing of the work box shown in Figure 1, and no material is filled between them. However, the ceiling, door, front panel, and right side panel are omitted. [Diagram 5] This is a diagram showing an example in which a multi-hole unit is arranged in a corner portion consisting of only two surfaces of the housing of the work box shown in Figure 1. However, the ceiling portion, door, front panel, and right side panel are omitted. [Figure 6] This is a diagram showing an example of a square columnar structure having two porous surfaces, where imaginary lines passing through the centers of holes in the porous surfaces in the penetrating direction may intersect with each other. This is also an example of a porous unit having a structure in which holes in each of the porous surfaces are included in an imaginary cross section perpendicular to both of the two different porous surfaces that are at an angle to each other. [Figure 7] This is a diagram showing an example of a square column having two porous surfaces, in which imaginary lines passing through the centers of the holes of the porous surfaces in the penetrating direction do not intersect with each other. This is also an example of a porous unit configured such that the holes of each porous surface are not included in an imaginary cross section perpendicular to both of the two different porous surfaces that are at an angle to each other. [Figure 8] 8 is a diagram showing an example of cutting the porous unit shown in FIG. 7 along one of the imaginary cross sections. FIG. [Figure 9] FIG. 13 shows an example of a square columnar porous unit having three porous surfaces. [Figure 10] 13 is a diagram showing an example of a porous unit having a rectangular prism shape with two porous surfaces, each of which has holes of different sizes. FIG. [Figure 11]FIG. 13 is a diagram showing an example of an L-shaped porous unit when viewed from the side. [Figure 12] FIG. 13 is a diagram showing an example of a porous unit that is L-shaped when viewed from three directions perpendicular to each other. [Figure 13] 13 is a diagram showing an example of covering a corner portion having three sides with a porous unit formed by combining a member having two angled porous surfaces with a member having one porous surface. FIG. [Figure 14] 1 is a diagram showing an example in which multi-hole units are distributed around the center of a housing having a rectangular shape in plan view, with a sound generating source being located at the center of the housing. [Figure 15] FIG. 1 is a diagram showing an example of an electric / electronic device storage box having an external attachment member (cover member) attached to a housing. [Figure 16] FIG. 13 is a diagram showing a state in which an external mounting member (covering member) and a ventilation fan are removed from a housing of the electrical / electronic device storage box. [Figure 17] FIG. 13 is a diagram showing an example in which a multi-hole unit is disposed in a corner portion inside an external mounting member (covering member). [Figure 18] This is a diagram showing an example in which a multi-hole unit is arranged on an external attachment member (cover member) attached to the outside of a housing having a rectangular shape in a plan view, where a sound source is located near the boundary between the housing and the external attachment member. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The following describes an embodiment of the present invention. As can be understood from Figures 1 to 6, a housing 1 of this embodiment has an internal space formed by using panels. In addition, in this housing 1, a porous unit 5 having two or more porous surfaces 51 with a plurality of open holes 511 is arranged to face a corner portion provided inside the housing 1, and the first porous surface 51a and the second porous surface 51b of the porous unit 5 are positioned to form an angle, the first porous surface 51a and the corner constituent surface Cs, which is one of the corner constituent surfaces Cs that are components of the corner portion and is located in the penetrating direction of the hole 511 provided in the first porous surface 51a, are positioned apart, and the second porous surface 51b and the corner constituent surface Cs, which is one of the corner constituent surfaces Cs that are components of the corner portion and is located in the penetrating direction of the hole 511 provided in the second porous surface 51b, are positioned apart, and a space is provided between the first porous surface 51a and the corner portion and between the second porous surface 51b and the corner portion through which the sound that has moved to the corner portion side through the hole 511 of the porous surface 51 can move. This makes it possible to easily reduce the energy of the sound generated inside the housing 1.

[0016] In particular, it is preferable that at least one of the corner constituent surfaces Cs facing the porous unit 5 is a surface of the panel. In this case, it is preferable that the first porous surface 51a is one of the corner constituent surfaces Cs and is located away from a surface of the panel located in the penetrating direction of the holes 511 provided in the first porous surface 51a.

[0017] The housing 1 is a work box or a box for storing electric and electronic equipment using a side panel 11, and a perforated unit 5 is installed inside the housing 1. The perforated unit 5 has a perforated surface 51 that is a surface having a large number of holes 511, and is capable of absorbing sounds in a relatively low frequency range by Helmholtz resonance. As a result of experiments by the inventors, it was confirmed that sound is easily reflected at corners inside the housing 1, so the perforated unit 5 is installed in a corner inside the housing 1. The perforated unit 5 is usually fixed so as not to move.

[0018] The porous unit 5 is configured to have a plurality of surfaces that form an angle. Also, some of the porous surfaces 51 are configured to form an angle. The angle formed by the porous surfaces 51 may be in the range of more than 0 degrees and less than 180 degrees, but it is preferable that the angle formed by at least one pair of porous surfaces 51 is 90 degrees.

[0019] Since the porous unit 5 is disposed in a corner portion inside the housing 1, it is disposed so as to be adjacent to two corner constituent surfaces Cs or three corner constituent surfaces Cs. In this case, at least two porous surfaces 51 are disposed at an interval from any of the corner constituent surfaces Cs forming the corner portion where the porous unit 5 is disposed, and it is preferable that the corner constituent surfaces Cs and the porous surfaces 51 are configured to be parallel. In particular, it is preferable that at least one porous surface 51 is configured to be positioned parallel to the side panel 11 with an interval therebetween.

[0020] The first porous surface 51a and the second porous surface 51b provided in the porous unit 5 are positioned at an angle. In other words, the first porous surface 51a and the second porous surface 51b are positioned non-parallel. The first porous surface 51a and the second porous surface 51b are provided to allow sound moving toward a specific corner area to pass through. There is a space on the corner side of the first porous surface 51a and the second porous surface 51b, and the energy of the sound is attenuated by moving while colliding with members positioned around this space.

[0021] A corner constituent surface Cs, which is one of the surfaces constituting the corner portion and is located in the penetrating direction of the hole 511 provided in the first porous surface 51a, and a corner constituent surface Cs, which is one of the surfaces constituting the corner portion and is located in the penetrating direction of the hole 511 provided in the second porous surface 51b, may be the same, but it is preferable that they are different.

[0022] That is, it is preferable that the first porous surface 51a is located away from a first corner forming surface Cs which is one of the corner forming surfaces Cs and located in the penetrating direction of the hole 511 provided in the first porous surface 51a, and the second porous surface 51b is located away from a second corner forming surface Cs which is one of the corner forming surfaces Cs and located in the penetrating direction of the hole 511 provided in the second porous surface 51b. It is also preferable that the first corner forming surface Cs and the second corner forming surface Cs are surfaces that the panel has. It is also preferable that the first corner forming surface Cs is a surface that the side panel 11 has.

[0023] For example, the porous unit 5 is formed in a prismatic shape. A rectangular prism shape is typical, but a prismatic shape other than a rectangular prism shape, such as a pentagonal prism or a hexagonal prism, may be used. When there is a surface parallel to the porous surface 51, the surface may also be made into the porous surface 51, or the surface may be made into a non-porous surface 52 that does not have holes 511 for passing sound.

[0024] Even when both parallel surfaces are porous surfaces 51, sound reaching surfaces such as the side panel 11 can be suppressed, but to obtain a greater effect, it is preferable that the surface parallel to the surface on which the porous surface 51 is provided is a non-porous surface 52. In other words, when the porous unit 5 is a square prism, it is preferable that only two adjacent surfaces or only three surfaces that are at right angles to each other be porous surfaces 51 among the six surfaces that constitute the square prism.

[0025] The same can be said for the case where the porous unit 5 is a hexagonal prism or other prism. For example, when the porous unit 5 is a hexagonal prism, it is preferable that, among the eight faces constituting the hexagonal prism, the two faces that become the bottom faces are not made into the porous faces 51, or only one of the two bottom faces is made into the porous face 51. In addition, it is preferable that the side faces are made into the porous faces 51 by a portion selected from the faces positioned on the half circumference.

[0026] For example, when the porous unit 5 is a rectangular column as shown in Fig. 2, the non-porous surface 52 is disposed in the space between the porous surface 51 and the corner portion. In this way, sound that has traveled toward the corner portion through the holes 511 of the porous surface 51 can be reflected by the non-porous surface 52, and a sound absorbing effect can be achieved.

[0027] A hollow rectangular parallelepiped porous unit 5 can be cited as a representative example of a porous unit 5 with a simple configuration, so in the example of disposing the porous unit 5 in the work box, a hollow rectangular prism-shaped porous unit 5 will be mainly exemplified and described. Usually, a desk 19 and a chair (not shown) for a worker to work are installed inside the housing 1 of the work box. There are various possible sources of sound in the work box, and the worker is also a source of sound. For example, when a worker holds a meeting using the web or makes a phone call, the voice he or she emits may leak to the outside. In addition, the voice he or she emits may echo inside the housing 1, causing a problem in the worker's work.

[0028] In order to prevent this from happening, the porous unit 5 is installed in a corner portion of the housing 1. Of course, the porous unit 5 may be placed in a portion other than the corner portion inside the housing 1, but even in that case, the porous unit 5 is placed in at least one of the corner portions.

[0029] In order to suppress the influence of the voice of the worker, it is preferable to install the porous unit 5 at a position not too far from the height of the worker's head. For example, by installing the porous unit 5 above the desk 19, the sound absorbing effect can be improved.

[0030] Therefore, when the housing 1 is a work box equipped with a door body 18 that allows a person to enter and exit an enclosed work space that can be used as a working room, and a desk 19 on which the person works, it is preferable that the multi-hole unit 5 is configured to be installed above the desk 19 provided in the work space.

[0031] It is also preferable to place the porous unit 5 in a corner portion that is a component of a panel that will be located in front of the worker when the worker is facing the desk 19. For example, the porous unit 5 is placed in a corner portion that is a component of a side panel 11 adjacent to the desk 19.

[0032] FIG. 2 shows an example in which the porous unit 5 is installed from the desk 19 to the top surface. In such an example, for example, the porous unit 5 is installed so that a part of the porous unit 5 abuts against the top surface member of the housing 1 (a top surface panel or a frame (e.g., a frame extending in the left-right direction or a frame extending in the front-rear direction) which are members constituting the top surface) and a part of the porous unit 5 abuts against the desk 19. Since the porous unit 5 is installed at a corner, the porous unit 5 is installed so as to abut against two side surface members of the housing 1 (a side surface panel 11 or a frame (e.g., a frame extending in the up-down direction) which are members constituting the side surface). In FIG. 2, the two surfaces of the porous unit 5 located at a position visible from inside the housing 1 are porous surfaces 51. With such a configuration, it is possible to absorb the sound reflected at the corner portion between the desk 19 and the top surface, and it is possible to suppress the leakage of voices and the deterioration of the sound environment inside the housing 1.

[0033] As can be seen from Fig. 3, a plurality of porous units 5 may be arranged in a corner portion formed by two panels. In the example shown in Fig. 3, the porous units 5 are arranged vertically in a portion above the desk 19 in a corner portion extending in the vertical direction formed by the side panels 11, but the vertically arranged porous units 5 are spaced apart from each other in the vertical direction.

[0034] In the example shown in Fig. 3, the gaps between the porous units 5 arranged vertically are filled with members 71 in a rectangular column shape, but the gaps between the porous units 5 do not have to be filled with members of that shape. It is possible to not fill the gaps at all, or to fill the gaps between the porous units 5 with members of a different shape from the porous units 5. When filling the gaps between the porous units 5, it is preferable to use members having flat portions that connect the porous surfaces 51 of the porous units 5. The members filling the gaps between the porous units 5 may have sound absorbing properties.

[0035] In the example shown in FIG. 3, two porous units 5 are arranged between the desk 19 and the top surface, but three or more porous units 5 may be arranged between the desk 19 and the top surface, or multiple porous units 5 may be arranged at a corner portion extending in the horizontal direction and including the side panel 11 and the top panel as components. Of course, the porous units 5 may be attached to a corner portion located below the desk 19. In this case, the porous units 5 are attached to a corner portion formed by the side panels 11 or a corner portion formed by the side panel 11 and the bottom panel 13. When multiple porous units 5 are arranged, it is preferable that each of the porous units 5 arranged in a row has the same size. It is more preferable that they have the same shape.

[0036] Incidentally, it is desirable to place the porous unit 5 in a manner that avoids the adverse effects of repeated sound reflection between the panels. For this reason, a place with three surfaces that form an angle with each other is a preferable place to place the porous unit 5. For example, it is preferable to place the porous unit 5 in a corner where the top panel and two side panels 11 are adjacent to each other, or in a corner where the desk 19 and two side panels 11 are adjacent to each other.

[0037] When it is desired to reduce the space required for arranging the porous unit 5, it is preferable to preferentially arrange the porous unit 5 in a place having three surfaces that form an angle with each other, but it is also possible to prevent other porous units 5 from being arranged near the porous unit 5 arranged in such a place (see FIG. 4). In this case, it is preferable that one of the porous surfaces 51 of the porous unit 5 arranged in a place having three surfaces that form an angle with each other is configured so that the top panel, desk 19, or bottom panel 13 is located in the penetrating direction of the hole 511.

[0038] The perforated unit 5 does not have to be disposed at a location where there are three surfaces that form an angle with each other (see FIG. 5). For example, even if the perforated unit 5 is disposed at any position of a corner portion formed by two side panels 11, the perforated unit 5 may be disposed between the top panel and the desk 19, not at a corner portion where the top panel and the two side panels 11 are adjacent, or at a corner portion where the desk 19 and the two side panels 11 are adjacent. The perforated unit 5 may also be disposed at any position of a corner portion provided away from the two opposing side panels 11. In this case, the components of the corner portion do not include two or more side panels 11. For example, the corner portion may be a corner portion formed by two members, the top panel and the side panel 11, or a corner portion formed by two members, the desk 19 and the side panel 11.

[0039] When the porous unit 5 is provided in a corner portion formed by two members, the desk 19 and the side panel 11, it is preferable to place the porous unit 5 near the worker. In this way, a better effect of absorbing sounds (such as talking voices) emitted by people can be expected.

[0040] Incidentally, if holes 511 provided in the porous surface 51 are on the same surface, there is a high possibility that sound that enters and is reflected from one porous surface 51 of the porous unit 5 will exit from another porous surface 51. In order to suppress such a possibility, it is preferable that the imaginary lines Li passing through the centers of the holes 511 of the porous surface 51 in the penetration direction do not intersect with each other. In the example shown in FIG. 6, the imaginary lines Li intersect with each other. In the example shown in FIG. 7, the imaginary lines Li do not intersect with each other. In the example shown in FIG. 7, the imaginary lines Li are at different heights, so the imaginary lines Li do not intersect with each other.

[0041] Furthermore, it is preferable that the porous unit 5 is configured so that the center of a hole 511 provided in the other porous surface 51 of the same porous unit 5 is not located on a virtual cross section Vs, which is a cross section when cut perpendicular to both of the two different porous surfaces 51 that are at an angle to each other and passing through the center of a hole 511 provided in one of the two different porous surfaces 51 that are at an angle to each other.

[0042] The porous unit 5 having this configuration can be rephrased as a porous unit 5 in which the imaginary cross section Vs perpendicular to both of the two different porous surfaces 51 that are angled from each other does not simultaneously include both the center of the hole 511 in one porous surface 51 and the center of the hole 511 in the other porous surface 51. In this case, the porous unit 5 is in a state in which the imaginary cross section Vs includes either the center of the hole 511 in one porous surface 51 or the center of the hole 511 in the other porous surface 51, or neither of them.

[0043] More preferably, the porous unit 5 is one in which the holes 511 provided in the other porous surface 51 are not located on a virtual cross section Vs that is a cross section when cut so as to be perpendicular to both of the two different porous surfaces 51 that form an angle with each other and to pass through a hole 511 provided in one of the two different porous surfaces 51 that form an angle with each other. In other words, the porous unit 5 is one in which the holes 511 in one porous surface 51 and the holes 511 in the other porous surface 51 are not both included simultaneously in a virtual cross section Vs that is perpendicular to both of the two different porous surfaces 51 that form an angle with each other.

[0044] For example, in the example shown in Fig. 6, both the center of hole 511 in one porous surface 51 and the center of hole 511 in another porous surface 51 are simultaneously included in a virtual cross section perpendicular to both of the two different porous surfaces 51 that form an angle with each other (a virtual cross section (not shown) perpendicular to the longitudinal direction of the porous unit 5 in Fig. 6). On the other hand, in the example shown in Fig. 7, a configuration is provided in which both the hole 511 in one porous surface 51 and the hole 511 in another porous surface 51 are not simultaneously included in a virtual cross section Vs perpendicular to both of the two different porous surfaces 51 that form an angle with each other (a virtual cross section Vs perpendicular to the longitudinal direction of the porous unit 5 in Fig. 7) (see Figs. 7 and 8).

[0045] Even in the case of a porous unit 5 having three mutually perpendicular porous surfaces 51, it is preferable that both the holes 511 of one porous surface 51 and the holes 511 of the other porous surface 51 are simultaneously included in a virtual cross section Vs perpendicular to both of the two different porous surfaces 51 that form an angle with each other, but such a configuration may be difficult due to the relationship between the sizes of the holes 511. Even in this case, it is possible to configure such that both the center of the hole 511 of one porous surface 51 and the center of the hole 511 of the other porous surface 51 are not simultaneously included in a virtual cross section Vs perpendicular to both of the two different porous surfaces 51 that form an angle with each other (see FIG. 9).

[0046] 6, 7 and 9, three surfaces not shown among the six surfaces of the porous unit 5 are flat surfaces that are not porous surfaces 51. That is, the porous unit 5 shown in Fig. 6 and Fig. 7 has two porous surfaces 51, and the porous unit 5 shown in Fig. 9 has three porous surfaces 51.

[0047] The perforated unit 5 has different frequency bands for which it exhibits a sound absorbing effect depending on the size of each surface, the size of the holes 511 on each surface, and the shape of the holes 511. For this reason, the size and shape of the holes 511 may be changed on each surface, or the size and shape of the holes 511 on the same surface. In this way, a sound absorbing effect can be expected for a wide frequency band. For example, in the example shown in FIG. 10, the perforated unit 5 has a rectangular prism-like bottom surface, and the size of the holes 511 differs for each perforated surface 51, but each perforated surface 51 has holes 511 of a plurality of sizes. In the example shown in FIG. 6, the shape and size of the holes 511 of the perforated unit 5 are all the same.

[0048] As will be understood from these descriptions, it is preferable to configure the multi-hole unit 5 with holes 511 of different sizes.

[0049] Alternatively, the porous unit 5 may be a regular quadrangular prism with all six faces being square, and all the holes 511 may be made to have the same size and shape, thereby providing a sound absorbing effect specialized for a specific frequency band.

[0050] The porous unit 5 may also be substantially L-shaped in side view, with two rectangular parallelepipeds arranged with a 90-degree shift (see FIG. 11). Alternatively, it may be shaped like three rectangular parallelepipeds arranged with each rectangular parallelepiped shifted by 90 degrees (see FIG. 12). Of course, it is not limited to a rectangular prism, but may also be a hexagonal prism or an octagonal prism. In this case, the size and shape of each hole 511 are not particularly limited. The porous unit 5 may be formed using a metal plate or wood, or may be coated with resin or paint.

[0051] When the porous unit 5 of the examples shown in Figures 6 to 12 is placed near a corner, if the non-porous surface 52 is positioned in the space between the porous surface 51 and the corner, sound that has traveled toward the corner through the holes 511 in the porous surface 51 is reflected by the non-porous surface 52, thereby achieving a sound absorption effect.

[0052] As can be understood from these descriptions, the porous unit 5 is preferably installed to face a corner portion provided inside a housing 1 having an internal space formed by using a panel, the porous unit 5 being provided with a first porous surface 51a having a plurality of open holes 511, a second porous surface 51b positioned at an angle to the first porous surface 51a and having a plurality of open holes, a first non-porous surface 52 positioned away from the first porous surface 51a in the penetration direction of the holes 511 provided in the first porous surface 51a, and a second non-porous surface 52 positioned away from the second porous surface 51b in the penetration direction of the holes 511 provided in the second porous surface 51b, and a space through which sound that has moved through the holes 511 of the porous surface 51 can move between the first porous surface 51a and the first non-porous surface 52 and between the second porous surface 51b and the second non-porous surface 52.

[0053] 6, 7, 9, etc., the porous unit 5 is a rectangular parallelepiped having all six sides, but the porous unit 5 may be one having two or more sides. For example, the porous unit 5 may be formed with two sides. In this case, it is preferable that the top panel, the side panel 11, the desk 19, etc. are provided with some or all of the other sides of the hexahedron.

[0054] FIG. 13 shows an example of a porous unit 5 having three surfaces, which is constructed by combining a first member 50a having a substantially L-shape with two porous surfaces 51 and a second member 50b having one porous surface 51. In this example, a first mounting portion 50c used for mounting the first member 50a is provided on the corner forming surface Cs, and the second member 50b is attached to the first member 50a. Of course, the first member 50a in this example may be further divided and combined, or the first member 50a and the second member 50b in this example may be integrally formed. For example, in the porous unit 5 having such a configuration, since there is nothing located in the space between the porous surface 51 and the corner portion, the sound moving toward the corner portion through the holes 511 of the porous surface 51 is reflected by the corner forming surface Cs, thereby exerting a sound absorbing effect.

[0055] With regard to the sound source that is the source of the sound eliminated by the multi-hole unit 5, when the housing 1 is used as a work box, the worker working inside the housing is described as the main sound source. On the other hand, when the housing 1 is used as a box for storing electric and electronic equipment, the electric and electronic equipment stored inside the housing can be considered as the sound source. The electric and electronic equipment may be any equipment that generates sound when driven, such as a cooling device, a transformer, or a motor-driven device. In either case, by providing the multi-hole unit 5 at a corner inside the housing 1, a corresponding effect can be obtained (see FIG. 14).

[0056] Incidentally, when the electric / electronic device is a device such as a ventilation fan 81, a heat exchanger, or a cooling device that ventilates or cools the inside of the housing and is attached adjacent to an opening provided on the side of the electric / electronic device storage box, an external attachment member 2 such as a ventilation louver or a ventilation hood is attached to the outside of the housing 1 in order to cover the electric / electronic device exposed from the housing 1 (it is not necessary that the electric / electronic device protrudes from the housing) (see Figs. 15 and 16). In this case, the electric / electronic device adjacent to the opening can be considered as a sound source. In this case, if a perforated unit 5 is provided in the inner corner of the external attachment member 2 that functions as a covering member, a corresponding effect can be obtained (see Figs. 17 and 18).

[0057] For this reason, an external mounting member 2 has an internal space and is attached to the outside of a housing 1 that stores electric and electronic devices, and a porous unit 5 having two or more porous surfaces 51 with a plurality of open holes 511 is disposed so as to face a corner portion provided inside the external mounting member 2, a first porous surface 51a and a second porous surface 51b of the porous unit 5 are positioned so as to form an angle, and the first porous surface 51a and one of the corner constituent surfaces Cs that are components of the corner portion, a through hole 511 provided in the first porous surface 51a, It is preferable that the external mounting member 2 is such that the first porous surface 51a and the first non-porous surface 52, and the second porous surface 51b and the corner component surface Cs, which is one of the corner component surfaces Cs that is a component of the corner portion and is located in the penetrating direction of the hole 511 provided in the second porous surface 51b, are located apart, and that spaces are provided between the first porous surface 51a and the first non-porous surface 52, and between the second porous surface 51b and the second non-porous surface 52, through which sound that has moved toward the corner portion through the hole 511 of the porous surface 51 can move.

[0058] Although the present invention has been described above by taking the embodiment as an example, the present invention is not limited to the above embodiment and can be variously modified. For example, the arrangement of the multi-hole unit does not have to be limited to the corner portion. It is also possible to arrange it at a position other than the corner portion. Furthermore, the panel does not have to be limited to being located on the outer periphery side of the housing. It may be located on the inner periphery side of the housing. [Explanation of symbols]

[0059] 1 Case 2 External mounting parts 5 Multi-hole unit 18 Door body 19 desk 51 Porous Surface 51a First porous surface 51b Second porous surface 511 holes Cs Corner composition surface Li Virtual Line

Claims

1. A housing having an internal space formed by using a panel, a porous unit having two or more porous surfaces each having a plurality of open holes is disposed so as to face a corner portion provided inside the housing; the first porous surface and the second porous surface of the porous unit are positioned at an angle; The first porous surface and a corner constituent surface which is one of the corner constituent surfaces that is a component of the corner portion and is located in a penetrating direction of the hole provided in the first porous surface are located apart from each other, The second porous surface and a corner constituent surface which is one of the corner constituent surfaces that is a component of the corner portion and is located in a penetrating direction of the hole provided in the second porous surface are located apart from each other, Between the first porous surface and the corner portion, and between the second porous surface and the corner portion, there is provided a space through which sound that has traveled to the corner portion side through the holes in the porous surface can travel. Case.

2. 2. The housing according to claim 1, wherein at least one of the corner constituent surfaces facing the multi-hole unit is a surface of the panel.

3. The housing according to claim 2 , wherein the multi-hole unit has holes of different sizes.

4. The porous unit is 4. The housing according to claim 3, wherein imaginary lines passing through the centers of the holes in the porous surface in a penetrating direction do not intersect with each other.

5. The housing according to any one of claims 1 to 4 is a work box including a door that allows a person to enter and exit a closed work space that can be used as a working room, and a desk on which the person can work, A work box in which a perforated unit is installed above a desk provided in a work space.

6. An external attachment member that has an internal space and is attached to the outside of a housing that houses an electric / electronic device, a porous unit having two or more porous surfaces each having a plurality of open holes is disposed so as to face a corner portion provided inside the external mounting member; the first porous surface and the second porous surface of the porous unit are positioned at an angle; The first porous surface and a corner constituent surface which is one of the corner constituent surfaces that is a component of the corner portion and is located in a penetrating direction of the hole provided in the first porous surface are located apart from each other, The second porous surface and a corner constituent surface which is one of the corner constituent surfaces that is a component of the corner portion and is located in a penetrating direction of the hole provided in the second porous surface are located apart from each other, Between the first porous surface and the corner portion, and between the second porous surface and the corner portion, there is provided a space through which sound that has traveled to the corner portion side through the holes in the porous surface can travel. External mounting parts.

7. A multi-hole unit that is installed to face a corner portion provided inside a housing having an internal space formed by using a panel, a first porous surface having a plurality of open holes; a second porous surface disposed at an angle to the first porous surface and having a plurality of open holes; a first non-porous surface located away from the first porous surface in a direction through which holes are provided in the first porous surface; a second non-porous surface located away from the second porous surface in a direction through which the holes in the second porous surface pass; Equipped with A porous unit in which spaces through which sound that has traveled through holes in the porous surface can move are located between a first porous surface and a first non-porous surface, and between a second porous surface and a second non-porous surface.

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