Lighting structure

Abstract

This invention provides a lighting structure that can suppress direct sunlight from entering the indoor space through a light-gathering window formed in the side wall of a hollow projection extending from the roof of a building, using a simple configuration, while also improving the amount of non-direct light entering the indoor space. [Solution] The lighting structure according to the present invention is a lighting structure that can bring natural light into the indoor space of a building, and is formed on the side wall of a hollow projection that protrudes from the roof of the building, and comprises: a lighting window that can bring in the natural light inside the hollow projection; a first reflecting part having a first reflecting surface that can reflect upward the natural light brought in from the lighting window into the hollow projection; a second reflecting part having a second reflecting surface that can reflect downward the natural light reflected by the first reflecting surface of the first reflecting part; and a light guiding part that defines a light guiding gap that can guide the natural light reflected by the second reflecting surface of the second reflecting part into the indoor space, wherein the width of the light guiding gap increases as it approaches the indoor space.

Description

Technical Field

[0001] The present invention relates to a daylighting structure.

Background Art

[0002] Patent Document 1 describes a solar daylighting system including a window for introducing sunlight into a building. The solar daylighting system described in Patent Document 1 is configured such that sunlight is reflected by a lightshelf whose tilt is controlled by a control means and a ceiling surface.

Prior Art Literature

Patent Literature

[0003]

Patent Document 1

Summary of the Invention

Problem to be Solved by the Invention

[0004] According to the solar daylighting system described in Patent Document 1, direct sunlight, which is sunlight that enters an indoor space without being reflected by the lightshelf and the ceiling surface, can be restricted, and non-direct sunlight, which is sunlight reflected by the lightshelf and the ceiling surface, can be introduced into the indoor space. However, when the solar daylighting system described in Patent Document 1 is used for taking in daylight from a daylighting window formed on a side wall of a hollow protrusion protruding from the roof of a building, there is still room for improvement from the viewpoints of simplifying the configuration and improving the daylighting performance of non-direct light in the indoor space.

[0005] An object of the present invention is to provide a daylighting structure capable of suppressing direct light from entering an indoor space through a daylighting window formed on a side wall of a hollow protrusion protruding from the roof of a building with a simple configuration, and enhancing the daylighting performance of non-direct light in the indoor space.

Means for Solving the Problem

[0006] A first aspect of the present invention is a light-collecting structure, (1) A lighting structure that allows natural light to enter the indoor space of a building, A light-gathering window is formed in the side wall of a hollow projection that protrudes from the roof of the aforementioned building, and the interior of the hollow projection is provided with a light-gathering window that allows natural light to enter, The first reflecting portion includes a first reflecting surface capable of reflecting upward the natural light collected from the light-gathering window into the hollow protrusion, A second reflective section having a second reflective surface capable of reflecting downward the natural light reflected by the first reflective surface of the first reflective section, The system comprises a light guide section that defines a light guide gap that allows the natural light reflected from the second reflective surface of the second reflective section to be guided into the indoor space, The aforementioned light guide gap is a light-gathering structure in which the width increases as it approaches the indoor space.

[0007] One embodiment of the present invention is a light-collecting structure, (2) The light guide portion is a light-collecting structure as described in (1) above, wherein the inner surface of the light guide gap is provided with a third reflective surface capable of reflecting downward the natural light reflected by the second reflective surface of the second reflective portion.

[0008] One embodiment of the present invention is a light-collecting structure, (3) The second reflective portion is composed of a cover portion that covers the upper part of the hollow protrusion, The light-collecting structure according to (1) or (2) above, wherein the second reflective surface is provided on the lower surface of the cover portion.

[0009] One embodiment of the present invention is a light-collecting structure, (4) The side wall of the hollow protrusion is The first side wall portion in which the light-gathering window is formed, It comprises a second side wall portion, which is positioned opposite the first side wall portion and has a separate daylighting window formed therein, The first reflecting part is, Below the aforementioned light-gathering window, a first light shelf protrudes from the first side wall portion toward the second side wall portion of the hollow protrusion, The second light shelf is located below the aforementioned other light-gathering window, protruding from the second side wall portion of the hollow projection toward the first side wall portion, and forming a passage gap between itself and the first light shelf through which the natural light reflected by the second reflective surface of the second reflector portion can pass, The light-collecting structure according to any one of (1) to (3) above, wherein the first reflective surface is provided on the upper surface of the first light shelf and the second light shelf, respectively.

[0010] One embodiment of the present invention is a light-collecting structure, (5) The light guide section is A first light guide plate section is located below the first light shelf, It comprises a second light guide plate section connected below the second light shelf, The first light guide plate portion and the second light guide plate portion divide the light guide gap connected to the passage gap between them, The first light guide plate section and the second light guide plate section extend inclined with respect to the vertical direction such that the width of the light guide gap increases as it approaches the indoor space, thus forming the light-collecting structure described in (4) above. [Effects of the Invention]

[0011] According to the present invention, it is possible to provide a lighting structure that can suppress direct sunlight from entering the indoor space through a light-gathering window formed in the side wall of a hollow projection protruding from the roof of a building with a simple configuration, and can also improve the light-gathering capacity of the indoor space with non-direct sunlight. [Brief explanation of the drawing]

[0012] [Figure 1] This is a side cross-sectional view of a light-gathering structure as one embodiment of the present invention. [Figure 2] Figure 1 is a floor plan of a building equipped with a daylighting structure. [Figure 3] It is a perspective view of the light guide portion viewed from the indoor side of the building in Fig. 2. Mode for Carrying Out the Invention

[0013] Hereinafter, embodiments of the daylighting structure according to the present invention will be exemplarily described with reference to the drawings. Common members and portions in each drawing are denoted by the same reference numerals.

[0014] Fig. 1 is a vertical cross-sectional view of a daylighting structure 100 as one embodiment of the daylighting structure according to the present invention. The daylighting structure 100 is provided on a roof 200 of a building 1000. Although the building 1000 of the present embodiment is a two-story building, the building 1000 may be a one-story building or a three-story or higher building. In the present embodiment, the indoor space 1100 directly below the roof 200 where the daylighting structure 100 is provided is an office, but the application thereof is not particularly limited. Further, although the roof 200 of the present embodiment is a flat roof, it may be, for example, a sloped roof.

[0015] The daylighting structure 100 can allow natural light L to enter the indoor space 1100 of the building 1000. The daylighting structure 100 includes daylighting windows 10A, 10B, a first reflecting portion 20, a second reflecting portion 30, and a light guide portion 40. The natural light L may be sunlight.

[0016] The daylighting windows 10A and 10B are formed on a side wall 211 of a hollow protruding portion 210 protruding from the roof 200 of the building 1000. As shown in Fig. 2, the hollow protruding portion 210 may be located at a central portion of the roof 200. The hollow protruding portion 210 protrudes upward from the roof 200. The hollow protruding portion 210 has water stopping performance. That is, rainwater or the like does not intrude into the interior of the hollow protruding portion 210 from the outside of the hollow protruding portion 210. Although the hollow protruding portion 210 of the present embodiment has a box-shaped outer shape protruding upward from the flat roof serving as the roof 200, the structure is not limited thereto. The hollow protruding portion 210 may have, for example, a dormer-shaped outer shape protruding from a sloped roof.

[0017] In this embodiment, the hollow projection 210 is rectangular in shape when viewed from above in the vertical direction. The hollow projection 210 includes a side wall 211 extending in the vertical direction. The side wall 211 of the hollow projection 210 includes a first side wall portion 211A and a second side wall portion 211B positioned opposite the first side wall portion 211A. As shown in Figure 2, the first side wall portion 211A and the second side wall portion 211B in this embodiment constitute the long side of the rectangular hollow projection 210 in plan view. Furthermore, the side wall 211 of the hollow projection 210 in this embodiment includes a third side wall portion 211C and a fourth side wall portion 211D which constitute the short side of the rectangular hollow projection 210 in plan view. The third side wall portion 211C and the fourth side wall portion 211D are positioned opposite each other.

[0018] A light-gathering window 10A is formed in the first side wall portion 211A. Another light-gathering window 10B is formed in the second side wall portion 211B, separate from the light-gathering window 10A. Further light-gathering windows may be formed in one or both of the third side wall portion 211C and the fourth side wall portion 211D. The light-gathering windows formed in one or both of the third side wall portion 211C and the fourth side wall portion 211D may have the same configuration as the light-gathering windows 10A and 10B described below.

[0019] The daylight windows 10A and 10B are capable of receiving natural light L, such as sunlight, into the hollow projection 210. In other words, the daylight windows 10A and 10B are high-side windows. No daylight windows are provided at the top of the hollow projection 210. The daylight windows 10A and 10B may comprise, for example, a frame and a surface material fitted into the frame, which includes a translucent section through which natural light L can pass. The translucent section may be made of, for example, a transparent glass plate. In order to sufficiently illuminate the indoor space 1100 of the building 1000 with natural light L, it is preferable that the daylight windows 10A and 10B have sufficient height (vertical length).

[0020] The first reflective section 20 includes a first reflective surface 22 capable of reflecting upward natural light L collected into the hollow protrusion 210 from the light-gathering windows 10A and 10B.

[0021] Specifically, the first reflective section 20 of this embodiment is located below the daylight windows 10A and 10B. More specifically, the first reflective section 20 comprises a first light shelf 21A located below the daylight window 10A and a second light shelf 21B located below the daylight window 10B. The first light shelf 21A and the second light shelf 21B may be supported by metal fittings fixed to the structural frame of the building 1000, such as columns and beams.

[0022] The first light shelf 21A protrudes from the first side wall portion 211A toward the second side wall portion 211B of the hollow projection 210. The second light shelf 21B protrudes from the second side wall portion 211B toward the first side wall portion 211A of the hollow projection 210. In other words, the first light shelf 21A and the second light shelf 21B protrude substantially horizontally into the inside of the hollow projection 210. The first light shelf 21A or the second light shelf 21B may be a tray plate. As shown in Figure 1, the first light shelf 21A in this embodiment is composed of a separate part protruding from the first side wall portion 211A, but the configuration is not limited to this. The first light shelf 21A may, for example, be formed integrally with the first side wall portion 211A. The same applies to the second light shelf 21B. As shown in Figure 1, the second light shelf 21B in this embodiment is composed of a separate component protruding from the second side wall portion 211B, but the configuration is not limited to this. The second light shelf 21B may, for example, be formed integrally with the second side wall portion 211B.

[0023] The first reflective surface 22 of the first reflective section 20 in this embodiment is provided on the upper surfaces of the first light shelf 21A and the second light shelf 21B, respectively. For the convenience of explanation, the first reflective surface provided on the upper surface of the first light shelf 21A will be referred to as "first reflective surface 22A," and the first reflective surface provided on the upper surface of the second light shelf 21B will be referred to as "first reflective surface 22B."

[0024] The amount X1 of the protrusion X1 from the first side wall portion 211A of the first light shelf 21A in this embodiment is set so that natural light L collected from the daylight window 10A is not directly irradiated into the indoor space 1100 through the light guide gap 41 of the light guide portion 40, which will be described later, without any reflection. Specifically, the first light shelf 21A in this embodiment protrudes to a position where it intersects with the imaginary line Y1 shown in Figure 1. The imaginary line Y1 is an imaginary line connecting the upper end of the daylight window 10A and the lower end of the second light guide plate portion 41B in a side view (cross-sectional view in Figure 1).

[0025] The amount X2 of the second light shelf 21B protruding from the second side wall portion 211B in this embodiment is set so that natural light L collected from the daylight window 10B is not reflected in any way and does not directly irradiate the indoor space 1100 through the light guide gap 41 of the light guide portion 40, which will be described later. Specifically, the second light shelf 21B in this embodiment protrudes to a position where it intersects with the imaginary line Y2 shown in Figure 1. The imaginary line Y2 is an imaginary line connecting the upper end of the daylight window 10B and the lower end of the first light guide plate portion 41A in a side view (cross-sectional view in Figure 1).

[0026] As mentioned above, direct light can cause discomfort to users, so the lighting structure 100 has a shape that prevents direct light from entering the indoor space 1100.

[0027] The second reflective section 30 includes a second reflective surface 31 capable of reflecting downward the natural light L reflected by the first reflective surface 22 of the first reflective section 20.

[0028] Specifically, the second reflective portion 30 of this embodiment is located above the light-gathering windows 10A and 10B. More specifically, the second reflective portion 30 of this embodiment is composed of a cover portion 230 that covers the upper part of the hollow projection portion 210. The second reflective portion 30 may be plate-shaped, but may also have other shapes. The second reflective surface 31 of the second reflective portion 30 of this embodiment is provided on the lower surface of the cover portion 230.

[0029] Furthermore, as shown in Figure 1, a passage gap 42 is formed between the first light shelf 21A and the second light shelf 21B. Natural light L reflected by the second reflective surface 31 passes through the passage gap 42 and reaches the light guide section 40.

[0030] The light guide section 40 defines a light guide gap 41 that can guide natural light L reflected by the second reflective surface 31 of the second reflective section 30 into the indoor space 1100. As shown in Figure 1, the width W of the light guide gap 41 of the light guide section 40 increases as it approaches the indoor space 1100 of the building 1000 (downwards in Figure 1). In this embodiment, the width W is measured along the horizontal direction.

[0031] The inner surface that partitions the light guide gap 41 in this embodiment is a planar surface inclined with respect to the vertical direction, but it is not limited to this configuration. The inner surface that partitions the light guide gap 41 can be configured such that the width W of the light guide gap 41 increases as it approaches the indoor space 1100, and may, for example, be a convex curved surface.

[0032] Furthermore, the light guide section 40 of this embodiment is provided with a third reflective surface 43 on the inner surface that defines the light guide gap 41, which is capable of reflecting the natural light L reflected by the second reflective surface 31 of the second reflective section 30 downward. More specifically, in the light guide section 40 of this embodiment, the inner surface that defines the light guide gap 41 is composed of the third reflective surface 43.

[0033] Furthermore, the light guide section 40 of this embodiment includes a first light guide plate section 41A connected below the first light shelf 21A, and a second light guide plate section 41B connected below the second light shelf 21B. The first light guide plate section 41A and the second light guide plate section 41B divide the light guide gap 41 connected to the passage gap 42 between them. In other words, the light guide gap 41 of the light guide section 40 of this embodiment is divided between the first light guide plate section 41A and the second light guide plate section 41B. The first light guide plate section 41A and the second light guide plate section 41B extend inclined with respect to the vertical direction such that the width W of the light guide gap 41 increases as it approaches the indoor space 1100. That is, the opposing surfaces of the first light guide plate section 41A and the second light guide plate section 41B are the inner surfaces that divide the light guide gap 41. In this embodiment, the opposing surfaces of the first light guide plate portion 41A and the second light guide plate portion 41B are formed by the third reflective surface 43. The first light guide plate portion 41A and the second light guide plate portion 41B may be supported by metal fittings fixed to the structural frame of the building 1000, such as columns and beams.

[0034] As shown in Figure 1, the first light guide plate portion 41A in this embodiment is formed integrally with the first light shelf 21A, but the configuration is not limited to this. The first light guide plate portion 41A may be formed as a separate component connected to the first light shelf 21A, for example. Similarly, the second light guide plate portion 41B in this embodiment is formed integrally with the second light shelf 21B, but the configuration is not limited to this. The second light guide plate portion 41B may be formed as a separate component connected to the second light shelf 21B, for example.

[0035] Referring to Figure 3, the indoor space 1100 may be provided with multiple flat areas 1200 and stepped areas 1300 located between adjacent flat areas 1200. The flat areas 1200 may be used as workspaces, and desks and the like may be installed in them. Since stable illumination is required in the flat areas 1200, illumination may be mainly ensured by lighting fixtures. The stepped areas 1300 may be used as a refreshment space or a meeting space. The daylighting structure 100 is provided above the stepped areas 1300 of the indoor space 1100, and the circadian rhythm can be adjusted by the soft natural light L from the daylighting structure 100. Furthermore, as shown in Figure 3, the light guide section 40 of this embodiment further includes a connecting plate section 44 that connects the first light guide plate section 41A and the second light guide plate section 41B.

[0036] As described above, the light-collecting structure 100 includes the first reflecting section 20 and the second reflecting section 30, and therefore, with a simple configuration, it is possible to suppress the entry of direct sunlight into the indoor space 1100. Specifically, when the sun is high in the sky, at least a large portion (all of it in this embodiment) of the natural light L1 collected through the light-collecting windows 10A and 10B is reflected upward by the first reflecting surface 22 of the first reflecting section 20. Subsequently, the natural light L1 is reflected downward by the second reflecting surface 31 of the second reflecting section 30. Furthermore, the natural light L1 passes through the light-guiding gap 41 of the light-guiding section 40 and reaches the indoor space 1100. Non-direct light, which is natural light L1 that has been reflected by the first reflecting surface 22 and the second reflecting surface 31 and reached the indoor space 1100, is softer than direct light. Therefore, non-direct light is less likely to cause discomfort to users of the indoor space 1100 compared to direct light.

[0037] However, the presence of the first reflecting section 20 as described above makes it easier for the light guide gap 41 of the light guide section 40 to become narrower compared to a configuration without such a first reflecting section 20. When the light guide gap 41 becomes narrower, the illumination range by non-direct light in the indoor space 1100 becomes narrower, and the light collection efficiency of non-direct light in the indoor space 1100 decreases. For this reason, the light collection structure 100 is equipped with the first reflecting section 20, and the width W of the light guide gap 41 of the light guide section 40 increases as it approaches the indoor space 1100. This makes it possible to widen the illumination range by non-direct light in the indoor space 1100 and improve the light collection efficiency of non-direct light in the indoor space 1100.

[0038] Furthermore, as described above, the light guide section 40 of this embodiment is equipped with a third reflective surface 43 on the inner surface that partitions the light guide gap 41, which is capable of reflecting the natural light L1 reflected by the second reflective surface 31 of the second reflective section 30 downward. In order to prevent the indoor space 1100 from becoming dark due to the attenuation of the natural light L by the reflection of the third reflective surface 43, it is preferable that the third reflective surface 43 be white. For example, the third reflective surface 43 may be painted white. When the third reflective surface 43 is painted, it is preferable to suppress the gloss of the third reflective surface 43 in order to make the non-direct light reflected by the third reflective surface 43 a softer light compared to the direct light. In addition, it is preferable that the third reflective surface 43 diffusely reflects the natural light L downward. As a result, the natural light L becomes a softer light, the natural light L is not localized, and the indoor space 1100 becomes brighter.

[0039] Furthermore, even when the sun is low in the sky, if natural light L2 collected through the daylight windows 10A and 10B reaches the light guide gap 41 without being reflected by either the first reflective surface 22 or the second reflective surface 31, the natural light L2 is reflected by the third reflective surface 43 and reaches the indoor space 1100. Therefore, according to the daylighting structure 100 of this embodiment, it is possible to eliminate the incidence of direct sunlight into the indoor space 1100 of the building 1000, and the daylighting efficiency of non-direct light can be increased, as natural light L collected through the daylight windows 10A and 10B is collected into the indoor space 1100 as non-direct light.

[0040] In this embodiment, the daylight window 10A faces east, and the daylight window 10B faces west. Therefore, from sunrise to noon, the daylight window 10A mainly receives sunlight, which is natural light L. From noon to sunset, the daylight window 10B mainly receives sunlight, which is natural light L. Thus, the daylight structure 100 of this embodiment is capable of receiving natural light L from sunrise to sunset.

[0041] In this embodiment, at least one of the first reflective surface 22, the second reflective surface 31, and the third reflective surface 43 may diffusely reflect the incident light. By diffusely reflecting the incident light, a softer light can be irradiated onto the indoor space 1100.

[0042] In this embodiment, the first reflective surface 22 of the first reflective section 20, the second reflective surface 31 of the second reflective section 30, and the third reflective surface 43 of the light guide section 40 are achromatic, but they may be light yellow or the like. In this embodiment, for example, the first reflective surface 22, the second reflective surface 31, and the third reflective surface 43 are white. White may be, for example, color code number M-80 or M-90 issued by the Japan Paint Manufacturers Association. The color of the first reflective surface 22, the second reflective surface 31, and the third reflective surface 43 may be achieved, for example, by applying paint.

[0043] The aforementioned paint may be, for example, a paint with a semi-gloss or semi-gloss finish that meets the JIS K 5663 standard for synthetic resin emulsion paints. Furthermore, the first reflective surface 22, the second reflective surface 31, and the third reflective surface 43 may be given a matte finish. More specifically, the first reflective surface 22, the second reflective surface 31, and the third reflective surface 43 may have fine irregularities formed on them. The first reflective surface 22, the second reflective surface 31, and the third reflective surface 43 may be given a matte finish equivalent to the aforementioned semi-gloss or semi-gloss finish by the matte finish process.

[0044] The light-gathering structure according to the present invention is not limited to the specific configuration shown in the embodiments described above, and various modifications and changes are possible as long as they do not depart from the scope of the claims. [Explanation of Symbols]

[0045] 100: Lighting structure 10A, 10B: Skylight 20: 1st reflection section 21A: First Light Shelf 21B: Second Light Shelf 22, 22A, 22B: 1st reflective surface 30:Second reflection section 40: Light guide 41: Light guide gap 41A: 1st light guide plate part 41B: Second light guide plate part 42: Passage gap 43:Third reflective surface 44: Connecting plate section 200: Roof 210:Hollow protrusion 211: Side wall 211A: First side wall part 211B: Second side wall part 211C: Third side wall part 211D: 4th side wall part 230: Cover section 1000: Buildings 1100: Indoor space 1200: Flat area 1300: Step part L,L1,L2: Natural light W: Width X1,X2:Protrusion amount Y1, Y2: Virtual lines

Claims

1. A lighting structure that allows natural light to enter the indoor space of a building, A light-gathering window is formed in the side wall of a hollow projection that protrudes from the roof of the aforementioned building, and the interior of the hollow projection is provided with a light-gathering window that allows natural light to enter, The first reflective section includes a first reflective surface capable of reflecting upward the natural light collected from the light-gathering window into the hollow protrusion, A second reflective section having a second reflective surface capable of reflecting downward the natural light reflected by the first reflective surface of the first reflective section, The system comprises a light guide section that defines a light guide gap that allows the natural light reflected from the second reflective surface of the second reflective section to be guided into the indoor space, The light guide gap is a light-gathering structure in which the width increases as it approaches the indoor space.

2. The light-gathering structure according to claim 1, wherein the light-guide portion is provided with a third reflective surface on the inner surface that partitions the light-guide gap, capable of reflecting downward the natural light reflected by the second reflective surface of the second reflective portion.

3. The second reflective portion is composed of a cover portion that covers the upper part of the hollow protrusion, The light-collecting structure according to claim 1 or 2, wherein the second reflective surface is provided on the lower surface of the cover portion.

4. The side wall of the hollow protrusion is The first side wall portion in which the light-gathering window is formed, It comprises a second side wall portion, which is positioned opposite the first side wall portion and has a separate daylighting window formed therein, The first reflecting part is, Below the aforementioned light-gathering window, a first light shelf protrudes from the first side wall portion toward the second side wall portion of the hollow protrusion, The second light shelf is located below the aforementioned other light-gathering window, protruding from the second side wall portion of the hollow projection toward the first side wall portion, and forming a passage gap between itself and the first light shelf through which the natural light reflected by the second reflective surface of the second reflector portion can pass. The light-collecting structure according to claim 1 or 2, wherein the first reflective surface is provided on the upper surface of the first light shelf and the second light shelf, respectively.

5. The light guide section is A first light guide plate section is located below the first light shelf, It comprises a second light guide plate section connected below the second light shelf, The first light guide plate portion and the second light guide plate portion divide the light guide gap connected to the passage gap between them, The light-collecting structure according to claim 4, wherein the first light guide plate portion and the second light guide plate portion extend inclined with respect to the vertical direction such that the width of the light guide gap increases as it approaches the indoor space.

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