Daylighting device

Abstract

To provide a daylighting device which can be installed per a dwelling unit even during or after the construction of the building.SOLUTION: A daylighting device 2 for taking sunlight 18 into a building 1 has: at least one reflection member 27 which is provided outdoors, and reflects the sunlight 18 toward an indoor ceiling 10; a daylighting portion 30 which is provided in the ceiling 10 and collects the sunlight 18 reflected by the reflection member 27; and a light duct 28 which includes a light emission portion 32 which emits the sunlight 18 collected by the daylighting portion 30, at a predetermined position. The reflection member 27 and light duct 28 are provided on the same floor.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a daylighting device that can be installed on a dwelling unit basis. [Background technology]

[0002] A light duct device (daylighting device) is well known as a technology for sending natural light to areas in a building that are far from windows and cannot receive natural light. Patent Document 1 discloses a light duct device for sending natural light to each floor in a building having multiple floors. The light duct device has a vertical light duct unit that is installed in the building and extends vertically, and a plurality of horizontal light ducts that branch off from the side of the vertical light duct unit and extend horizontally. The vertical light duct unit is installed penetrating each floor from each attic to the ceiling of the lowest floor. Each horizontal light duct is arranged in the ceiling of the corresponding floor, and a light emitting unit is installed at the end of each horizontal light duct. The light emitting port of the light emitting unit is provided as an opening in the ceiling. A skylight for taking natural light into the building is installed on the roof of the building, and the upper end of the vertical light duct unit is arranged near the skylight. The light that passes through the skylight and is introduced into the vertical light duct unit is guided downward inside the vertical light duct unit, and part of it branches off in the horizontal light duct and is guided inside the horizontal light duct to the light emitting unit. The natural light guided to the light emitting unit is emitted into the room from a light emitting port provided in the ceiling.

[0003] Patent Document 2 discloses an example of a horizontal light duct that does not use a vertical light duct extending in the vertical direction. The horizontal light duct includes a light collecting section that collects sunlight (natural light), a light guiding section that guides the collected sunlight, and a light discharging section that discharging the sunlight guided by the light guiding section as illumination light for an indoor space. The horizontal light duct is arranged horizontally above the ceiling. The light collecting section is provided penetrating the exterior wall and the interior wall of the building. The natural light collected from the light collecting section passes through the light guiding section and is discharging into the room from the light discharging section provided on the ceiling. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2008-287920 A [Patent Document 2] JP 2015-069777 A Summary of the Invention [Problem to be solved by the invention]

[0005] The vertical optical duct unit described in Patent Document 1 is installed penetrating the floors of each floor from the roof of the top floor to the ceiling of the bottom floor. The horizontal optical duct described in Patent Document 2 is installed penetrating the exterior wall of the building in order to arrange the daylighting section on the building wall. Therefore, when installing an optical duct device in a building whose floors and exterior walls form the framework, it is necessary to incorporate the design of the optical duct device in the early stages of designing the building structure. Therefore, it is difficult to install the optical duct device during or after the construction of the building. In particular, when the building is an apartment building, it is difficult to install the optical duct device without affecting other dwelling units.

[0006] In view of the above background, an object of the present invention is to provide a daylighting device that can be installed on a dwelling unit basis during or after the construction of a building. [Means for solving the problem]

[0007] In order to solve the above problems, the present invention provides a daylighting device (2) for introducing natural light (18) into a building (1), comprising at least one reflecting member (27) that is provided outdoors and reflects the natural light toward an indoor ceiling (10), a daylighting section (30) that is provided on the ceiling and introduces the natural light reflected from the reflecting member, and a light duct (28) that includes a light emitting section (32) for emitting the natural light introduced by the daylighting section at a predetermined position, and the reflecting member and the light duct are provided on the same floor.

[0008] According to this aspect, since the reflecting member and the light duct are provided on the same floor, the daylighting device can be installed on a dwelling unit basis. Also, since the light duct is provided inside the building, the light duct is installed without penetrating the exterior wall of the building. Therefore, the daylighting device can be installed during or after the construction of the building.

[0009] In the above aspect, the reflective member is plate-shaped and may be provided on a handrail (22) of a balcony (20) that protrudes outward from the exterior wall (4) of the building.

[0010] According to this aspect, the work of installing the reflecting member becomes easier.

[0011] In the above aspect, the plurality of reflective members may be disposed vertically spaced apart from one another.

[0012] According to this aspect, it is possible to increase the amount of natural light reflected toward the ceiling.

[0013] In the above aspect, the reflecting member may be provided rotatably about a rotation axis (42) along the extending direction of the handrail.

[0014] According to this aspect, the amount of natural light entering the light duct can be adjusted by rotating the reflecting member.

[0015] In the above aspect, the lighting device may include a drive source (46) that changes the rotation angle of the reflecting member, and a control device (47) that controls the drive source.

[0016] According to this aspect, the resident is saved the trouble of rotating the reflecting member.

[0017] In the above aspect, the control device may change the rotation angle of the reflecting member based on the latitude and longitude of the building and the date and time.

[0018] According to this aspect, in the case where the natural light is, for example, sunlight, even if the angle of incidence of the sunlight incident on the reflecting member changes over time, the irradiation time of the sunlight reflected toward the light duct becomes longer.

[0019] In the above aspect, at least the reflective surface of the reflective member may be curved in a direction that is convex upward in the extension direction of the handrail.

[0020] According to this aspect, when the natural light is, for example, sunlight, even if the altitude of the sun is low, the irradiation time of the sunlight reflected toward the light duct becomes longer.

[0021] In the above aspect, the light duct further has a light guiding section (31) that guides the natural light collected from the light collecting section to the light releasing section, and the light collecting section is preferably formed wider than the light guiding section.

[0022] According to this aspect, a larger amount of natural light reflected from the reflective member is taken into the light duct.

[0023] In addition, in order to solve the above problems, a daylighting device (2) for introducing natural light (18) into the interior of a building (1) is provided outdoors and has a plurality of plate-shaped reflective members (27) that reflect the natural light toward an interior ceiling (10), and the plurality of reflective members are provided on a handrail (22) of a balcony (20) that protrudes outward from an exterior wall (4) of the building, spaced apart vertically from one another.

[0024] According to this aspect, since the reflective member is provided on the handrail, there is no need to penetrate the exterior wall of the building, and therefore the daylighting device can be installed on a dwelling unit basis during or after the construction of the building.

[0025] In the above aspect, the daylighting device may have a light-transmitting panel (29) provided on the indoor side of the reflective member.

[0026] According to this aspect, it is possible to prevent a resident from using the reflective member as a foothold to climb up onto the handrail. Effect of the Invention

[0027] The present invention can provide a daylighting device that can be installed on a dwelling unit basis during or after the construction of a building. [Brief description of the drawings]

[0028] [Figure 1] 1 is a side cross-sectional view of a building provided with a daylighting device according to a first embodiment; [Diagram 2] A perspective view of a building near the daylighting device [Diagram 3] Plan view of the lighting area [Figure 4] Side cross-sectional view of the lighting section [Diagram 5] FIG. 11 is a side cross-sectional view of a reflecting member according to a second embodiment. [Figure 6] FIG. 11 is a flow chart showing a control procedure for changing the rotation angle of the reflecting member executed by the control device. [Figure 7] FIG. 13 is a front view of the reflecting member according to the third embodiment; [Figure 8] 13 is a side cross-sectional view of a reflecting member according to a fourth embodiment. [Figure 9] 13 is a side cross-sectional view of a building provided with a daylighting device according to a fifth embodiment. [Figure 10] FIG. 11 is a side cross-sectional view showing a modified example of the reflecting member. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0029] Hereinafter, several embodiments of the present invention will be described in detail with reference to the drawings. In the following embodiments, an example will be described in which a daylighting device 2 is provided in a concrete building 1 used as an apartment building. Here, concrete construction means that the building 1 includes a floor 3 and an exterior wall 4 that are made of concrete. The concrete-containing structure may be, for example, reinforced concrete construction, steel-reinforced concrete construction, fiber-reinforced concrete construction, or the like.

[0030] First Embodiment As shown in Figure 1, building 1 is a multi-story building with multiple floors defined by concrete slabs 5, and separate dwelling units 6 are provided on each floor above and below the concrete slab 5. Multiple dwelling units 6 are provided on the same floor, and adjacent dwelling units 6 are separated from each other by concrete partition walls 7.

[0031] Ceiling panels 8 are provided below the concrete slab 5 at intervals, thereby forming a ceiling 10 in the dwelling unit 6. The ceiling 10 has an attic space 12 defined between the ceiling panels 8 and the concrete slab 5.

[0032] A floor panel 14 is provided above the concrete slab 5, thereby forming the floor 3 of the dwelling unit 6. The floor 3 of the dwelling unit 6 may be a direct floor structure in which the floor panel 14 is laid directly on the concrete slab 5, or may be a double floor structure in which the floor panel 14 is laid on the concrete slab 5 via a plurality of support legs (not shown). The floor panel 14 may be, for example, flooring. The floor panel 14 may also be laid on an underlay panel such as a soundproof mat.

[0033] An opening is formed in the exterior wall 4 of the building 1, and a window 16 is provided to cover the opening. In this embodiment, the window 16 is configured as a bay window made up of multiple window panels that can be opened and closed. The window 16 may be configured so that all of the window panels can be opened and closed, or some of the window panels may be configured as fixed windows. The window 16 is provided on the south side of the building 1 where sunlight 18 from the sun 17 shines. In other embodiments, the window 16 may be provided in a direction other than the south of the building 1.

[0034] The inside of the exterior wall 4 in which the window 16 is provided forms the interior of the building 1. The outside of the exterior wall 4 in which the window 16 is provided forms the exterior of the building 1.

[0035] A balcony 20 is formed in the dwelling unit 6. The balcony 20 is provided outside the building 1. The balcony 20 has an overhanging floor 21 that overhangs outward from the exterior wall 4 and a handrail 22 to prevent falls. As shown in FIG. 2, in this embodiment, the handrail 22 has multiple pillars 22A that extend upward from the tip of the overhanging floor 21 and upper rails 22B that connect the upper ends of the multiple pillars 22A. The multiple pillars 22A are arranged at a distance from each other along the width direction of the window 16. The upper rails 22B extend along the width direction of the window 16.

[0036] Returning to FIG. 1, a partition wall 24 is provided on the indoor side of the building 1 to divide the living space of the dwelling unit 6. The living space of the dwelling unit 6 is divided by the partition wall 24 having a door into a room 6A with a window 16 and a washroom 6B with a washstand 25. The washroom 6B does not have a window 16. Therefore, when the entrance door of the washroom 6B is closed, natural light does not reach the washroom 6B. In this embodiment, the natural light is sunlight 18 from the sun 17, but the natural light may be moonlight. The partition wall 24 may be formed, for example, by a plurality of studs extending vertically from the ceiling 10 to the floor 3 and plate materials 26 attached to both sides of the studs.

[0037] In the following description, the outdoor side of the building 1 in the depth direction of the dwelling unit 6 (left side in the left-right direction on the paper) is defined as the front, and the indoor side of the building 1 in the depth direction of the dwelling unit 6 (right side in the left-right direction on the paper) is defined as the rear. Also, the width direction of the dwelling unit 6 (front-rear direction on the paper) is defined as the left-right direction.

[0038] A daylighting device 2 for introducing sunlight 18 into the dwelling unit 6 is provided. Specifically, the daylighting device 2 has a plurality of reflecting members 27 and a light duct 28 for introducing the sunlight 18 reflected by the reflecting members 27 and emitting the light at a predetermined position. The reflecting members 27 are provided outdoors. The light duct 28 is provided indoors. The reflecting members 27 and the light duct 28 are provided in the same dwelling unit 6. The daylighting device 2 also has a translucent panel 29 provided on the indoor side of the reflecting members 27.

[0039] The reflecting member 27 is a plate extending in the direction in which the upper rail 22B extends, i.e., in the left-right direction. Reflecting surfaces are provided on the front and back surfaces of the reflecting member 27. The reflecting member 27 may be made of a material with high reflectivity, such as aluminum, whose front and back surfaces are mirror-finished. Alternatively, the reflecting member 27 may be made by attaching a reflecting material made of aluminum or the like to the front and back surfaces of a plate-shaped member, such as wood or resin. The reflecting member 27 is provided on the handrail 22 so that the front surface of the reflecting member 27 faces upward and backward in order to reflect the sunlight 18 toward the indoor ceiling 10. The reflecting members 27 are provided along the handrail 22 of the balcony 20 while being spaced apart from each other vertically. One of the multiple reflecting members 27 is provided on the upper rail 22B of the handrail 22 provided on the balcony 20. The remaining reflecting members 27 are provided between the posts 22A of the handrail 22 provided on the balcony 20.

[0040] The light-transmitting panel 29 is made of a transparent or semi-transparent resin material, glass material, or the like. The light-transmitting panel 29 is attached to the support 22A of the handrail 22 via an attachment member 29A with its surface facing the front-rear direction. The light-transmitting panel 29 is disposed on the indoor side of the reflecting member 27. This prevents a resident from using the reflecting member 27 as a foothold to climb up to the handrail 22. In addition, when the window 16 is opened to connect the outdoors to the indoors, strong winds are prevented from passing through the handrail 22 and blowing into the indoors.

[0041] The light duct 28 has a light collecting section 30 for collecting sunlight 18 reflected from the reflecting member 27, a light guiding section 31 for guiding the sunlight 18 collected from the light collecting section 30 to a predetermined position, and a light discharging section 32 for emitting the sunlight 18 guided by the light guiding section 31 at a predetermined position in the room.

[0042] As shown in FIG. 2, the daylight collecting section 30 has a plate-shaped light-transmitting section 30A for transmitting the sunlight 18, and a box-shaped light-collecting section 30B for collecting the sunlight 18 that has passed through the light-transmitting section 30A toward the light-guiding section 31. The light-transmitting section 30A is arranged so as to cover a first opening 8A formed in advance in the ceiling panel 8. The first opening 8A is provided in the ceiling panel 8 that constitutes the ceiling 10 of the room 6A having the window 16. The first opening 8A is provided at a position on the ceiling panel 8 where at least the sunlight 18 reflected by the reflecting member 27 hits. The light-transmitting section 30A is preferably arranged so as to eliminate a step with the ceiling panel 8. The width of the first opening 8A in the left-right direction is formed to be approximately equal to the width of the window 16 in the left-right direction. That is, the width of the light-transmitting section 30A in the left-right direction and the width of the light-collecting section 30B in the left-right direction are also formed to be approximately equal to the width of the window 16 in the left-right direction.

[0043] The light collecting section 30B is disposed above the light transmitting section 30A, i.e., in the attic space 12. As shown in Figures 3 and 4, the light collecting section 30B extends in the left-right direction and has a front wall 33 whose surface faces the front-rear direction, and a rear wall 34 facing the front wall 33. The light collecting section 30B also has a left side wall 35 and a right side wall 36 that connect the left and right ends of the front wall 33 and the rear wall 34, and an upper wall 37 that connects the upper ends of the front wall 33, the rear wall 34, the left side wall 35 and the right side wall 36.

[0044] The front wall 33 is disposed along the width direction of the window 16. The front wall 33 may be disposed so as to be in contact with the window 16 or the outer wall 4, or may be disposed so as to be spaced apart from the window 16 or the outer wall 4. The rear wall 34 is curved in a direction that convexly faces rearward. The vertical dimension of the rear wall 34 is formed to be larger than the vertical dimension of the front wall 33.

[0045] The front-rear widths of the left side wall 35 and the right side wall 36 are smaller than the left-right widths of the front wall 33 and the rear wall 34. The upper wall 37 is curved in a direction that is convex upward and outwardly toward the front in a side view. The lower part of the light collecting portion 30B is opened by the front wall 33, the rear wall 34, the left side wall 35 and the right side wall 36, and the light transmitting portion 30A is attached to the light collecting portion 30B so as to close this opening.

[0046] A reflecting surface is provided on the inner surface of each of the walls 33, 34, 35, 36, and 37 constituting the light collecting section 30B. The reflecting surface may be formed by the inner surface of the light collecting section 30B that is mirror-finished or unfinished, or may be formed by attaching a reflecting material such as an aluminum or stainless steel plate.

[0047] The rear wall 34 is provided with a connection port 38 for connection to the light guiding section 31. The connection port 38 is formed to have a rectangular cross section. In this embodiment, the connection port 38 is provided in the center in the width direction of the rear wall 34. In other embodiments, the connection port 38 may be provided at a position biased to one side in the width direction of the rear wall 34.

[0048] 1, the light guide unit 31 is made of a duct and has a horizontal duct 39 extending in the front-rear direction and a vertical duct 40 connected to the rear end of the horizontal duct 39 and extending in the up-down direction. The horizontal duct 39 and the vertical duct 40 are formed to have a rectangular cross section. A reflective surface is provided on the inner surface of the horizontal duct 39 and the vertical duct 40. The reflective surface may be formed by the inner surface of a duct that is mirror-finished or unfinished, or may be formed by attaching a reflective material such as an aluminum or stainless steel plate to the inner surface of the duct.

[0049] The light collecting section 30 is provided with a large width relative to the light guiding section 31. As shown in Figures 2 and 3, the front end of the horizontal duct 39 is formed with an inverted taper. That is, at the front end of the horizontal duct 39, the width in the left-right direction is larger the closer to the front end. The light guiding section 31 is connected to the light collecting section 30B so that the opening at the front end of the horizontal duct 39 is aligned with the connecting port 38 provided in the light collecting section 30B.

[0050] As shown in FIG. 1, the light emitting section 32 may be formed in a plate shape using a transparent or semi-transparent resin material, glass material, or the like. The light emitting section 32 is provided in the light guiding section 31 so as to close the opening at the lower end of the vertical duct 40. The light emitting section 32 is also arranged so as to close the second opening 8B formed in advance in the ceiling panel 8. The second opening 8B is provided in the ceiling panel 8 forming the ceiling 10 of the washroom 6B in which the window 16 is not provided. The light emitting section 32 is preferably arranged so as to eliminate a step with the ceiling panel 8. A functional component capable of adjusting the amount of light emitted, such as a shutter or a blind, may be provided on the washroom 6B side of the light emitting section 32.

[0051] In the daylight collecting device 2 configured as described above, sunlight 18 passes through the window 16 and is reflected by the reflecting members 27 attached to the handrail 22 of the balcony 20 toward the ceiling 10 of the room 6A in which the window 16 is located. A portion of the sunlight 18 reflected by the reflecting members 27 passes through the translucent panel 29 and the window 16. By providing multiple reflecting members 27, the amount of sunlight 18 reflected toward the ceiling 10 increases.

[0052] A part of the sunlight 18 reflected toward the ceiling 10 passes through the light transmitting portion 30A of the daylight collecting portion 30 and enters the light collecting portion 30B. The width of the daylight collecting portion 30 is formed to be approximately equal to the width of the window 16, so that a larger amount of sunlight 18 is taken into the light duct 28. The sunlight 18 that enters the light collecting portion 30B is repeatedly reflected by the reflecting surface provided on the inner surface of the light collecting portion 30B, passes through the connecting port 38, and is collected at the front end of the light guiding portion 31. The sunlight 18 collected at the light guiding portion 31 is repeatedly reflected by the reflecting surface provided on the inner surface of the horizontal duct 39 and the reflecting surface provided on the inner surface of the vertical duct 40, and is guided toward the lower end of the vertical duct 40. The sunlight 18 guided toward the lower end of the vertical duct 40 passes through the light emitting portion 32 and is emitted toward the washroom 6B.

[0053] As described above, daylight collecting device 2 can deliver sunlight 18 to washroom 6B which does not have a window 16. Because reflective member 27 and light duct 28 are provided in the same dwelling unit 6, daylight collecting device 2 can be installed on a dwelling unit basis. Because the work of creating first opening 8A in ceiling panel 8 is easier than the work of penetrating exterior wall 4, daylight collecting device 2 can be installed during or after construction of building 1. Furthermore, because light collecting section 30B and light guiding section 31 are disposed in attic 12, daylight collecting device 2 can be installed without narrowing the living space.

[0054] In other embodiments, the light emitting unit 32 may be provided on, for example, the ceiling 10 of a room where the sunlight 18 is difficult to reach or the ceiling 10 of a corridor. This enables the daylight collecting device 2 to deliver the sunlight 18 to a room or a corridor where the sunlight 18 is difficult to reach.

[0055] In another embodiment, the light guiding unit 31 may be configured by bundling optical fibers. By directing one end face of the light guiding unit 31 toward the connecting port 38, sunlight 18 enters the inside of the optical fiber. The sunlight 18 that enters the inside of the optical fiber is guided to the side of the washroom 6B through repeated total reflection. By directing the other end face of the light guiding unit 31 toward the light emitting unit 32, the guided sunlight 18 passes through the light emitting unit 32 and is emitted toward the washroom 6B.

[0056] Second Embodiment Next, a second embodiment of the present invention will be described with reference to Figures 5 and 6. Elements that are the same as or similar to those in the first embodiment are given the same reference numerals, and duplicated explanations will be omitted. In the daylight collecting device 2 of this embodiment, the configuration of the reflective member 27 is different from that of the first embodiment, and the other configurations (light duct 28) are the same as those of the first embodiment. Below, the differences from the first embodiment will be described.

[0057] As shown in Fig. 5, the reflecting member 27 may be, for example, a blade of a known louver. A rotating shaft 42 that protrudes outward to the left and right is provided at the center of both left and right ends of the reflecting member 27. The rotating shaft 42 is inserted into a corresponding bearing hole (not shown) that is provided in advance in the support 22A. As a result, the reflecting member 27 is supported by the support 22A so as to be rotatable around the rotating shaft 42 in the left-right direction.

[0058] The multiple reflective members 27 are connected to one another via connecting members 44. The connecting members 44 may be plate-shaped members extending in the vertical direction. The connecting members 44 are connected to the front ends of the respective reflective members 27. By moving the connecting members 44 up and down, each reflective member 27 rotates around the corresponding rotation shaft 42. By rotating the reflective members 27, the amount of sunlight 18 entering the daylight collecting section 30 can be adjusted.

[0059] The daylighting device 2 has an electric motor 46 as a drive source for moving the connecting member 44 up and down, i.e., for rotating each reflecting member 27. The electric motor 46 may be connected to the connecting member 44, for example, via a pinion gear provided on the output shaft of the electric motor 46 and a rack gear provided on the lower end of the connecting member 44 and meshing with the pinion gear. The electric motor 46 may be connected to a distribution board (not shown) of the dwelling unit 6 via an electric cable. Alternatively, the electric motor 46 may be connected to a battery (not shown). The battery may be a rechargeable secondary battery or a solar cell.

[0060] The daylight collecting device 2 also has a control device 47 that is connected to the electric motor 46 and controls the rotation of the electric motor 46. The control device 47 is made up of a computer equipped with an arithmetic processing device (a processor such as a CPU or MPU) and a storage device (memory such as a ROM or RAM), and configured to execute various processes required to change the rotation angle of the reflecting member 27. The control device 47 also has a clock. The control device 47 being configured to execute various processes means that the arithmetic processing device (processor) that constitutes the control device 47 is programmed to read necessary data and application software from the clock and storage device (memory), and execute the specified arithmetic processing in accordance with the software.

[0061] The storage device presets a predetermined rotation angle of the reflecting member 27 corresponding to the latitude and longitude of the building 1 and the date and time. The predetermined rotation angle is an angle that effectively reflects sunlight 18 toward the daylighting section 30 at the altitude of the sun 17 based on the latitude and longitude of the building 1 and the date and time.

[0062] As shown in FIG. 6, the control device 47 executes rotation control to rotate the reflecting member 27. First, the control device 47 acquires the current date and time from the clock (ST1). Next, the control device 47 acquires a predetermined rotation angle of the reflecting member 27 corresponding to the current date and time from the storage device (ST2). After that, the control device 47 rotates the electric motor 46 so that the acquired rotation angle of the reflecting member 27 is reached (ST3). The rotation control is performed periodically. As described above, the control device 47 changes the rotation angle of the reflecting member 27 based on the latitude and longitude of the building 1 and the date and time. As a result, even if the altitude of the sun 17 changes over time, that is, the angle of incidence of the sunlight 18 incident on the reflecting member 27 changes, the irradiation time of the sunlight 18 reflected toward the daylight collecting section 30 becomes longer.

[0063] In another embodiment, the reflecting member 27 may be rotated by the resident. In this case, for example, a switch unit for receiving rotation operation of the electric motor 46 may be provided. By manually rotating the reflecting member 27, the resident can appropriately adjust the amount of sunlight 18 that is introduced into the room.

[0064] Third Embodiment Next, a third embodiment of the present invention will be described with reference to Fig. 7. Elements that are the same as or similar to those in the first embodiment are given the same reference numerals, and duplicated explanations will be omitted. In the daylight collecting device 2 of this embodiment, the configuration of the reflective member 27 is different from that of the first embodiment, and the other configurations (light duct 28) are the same as those of the first embodiment.

[0065] Reflective member 27 is curved in a direction that is convex upward in the left-right direction. As a result, when sun 17 is low in altitude, such as in the morning or evening, sunlight 18 is reflected toward daylight collecting section 30 by both left and right ends of reflecting member 27. Therefore, the irradiation time of sunlight 18 reflected toward daylight collecting section 30 becomes longer.

[0066] Fourth Embodiment Next, a third embodiment of the present invention will be described with reference to Fig. 8. Elements that are the same as or similar to those in the first embodiment are given the same reference numerals, and duplicated explanations will be omitted. In the daylight collecting device 2 of this embodiment, the configuration of the reflective member 27 is different from that of the first embodiment, and the other configurations (light duct 28) are the same as those of the first embodiment.

[0067] There is only one reflective member 27, which is disposed on the upper rail 22B of the handrail 22. As a result, even if the handrail 22 is formed integrally with the overhanging floor 21, for example, and is a concrete wall extending upward from the tip of the overhanging floor 21, the reflective member 27 can be installed without changing the shape of the handrail 22. Therefore, the work of installing the reflective member 27 is easy even after construction.

[0068] Fifth embodiment Next, a fifth embodiment of the present invention will be described with reference to Fig. 9. Elements that are the same as or similar to those in the first embodiment are given the same reference numerals, and duplicated descriptions will be omitted.

[0069] The daylighting device 2 does not have a light duct 28. That is, a plurality of reflecting members 27 are provided on the handrail 22, spaced apart from one another vertically. The reflecting members 27 reflect sunlight 18 toward the ceiling panel 8 of the room 6A in which the window 16 is located. This allows sunlight 18 to be taken into the room 6A in which the window 16 is located. When installing the daylighting device 2, the work of providing a first opening 8A in the ceiling panel 8 and the work of penetrating the exterior wall 4 are not required. Therefore, the daylighting device 2 can be installed on a dwelling unit basis, even during or after the construction of the building 1.

[0070] Although the description of the specific embodiment is finished above, the present invention is not limited to the above embodiment and modified examples, and can be widely modified and implemented. For example, in the above embodiment, the light emitting section 32 is arranged in the second opening 8B provided in the ceiling panel 8, but it may be arranged in an opening provided in the lower part of the plate material 26 on the side of the partition wall 24 on the washroom 6B side. As a result, the light emitting section 32 forms a footlight. As shown in FIG. 10(A), the reflecting member 27 may be curved in a direction that is convex upward and backward in side view. As a result, the reflected sunlight 18 is delivered to a wide range of the ceiling 10. Therefore, the sunlight 18 is incident on the daylighting section 30 for a longer period of time and reaches the room without the window 16, i.e., the washroom 6B. In addition, the reflected sunlight 18 hits a wide range of the ceiling 10 of the room 6A with the window 16, so that the room 6A with the window 16 becomes brighter. In addition, as shown in FIG. 10(B), the reflecting member 27 may be curved in a direction that is concave downward and forward in side view. As a result, the reflected sunlight 18 is concentrated in a small area of ​​the ceiling 10, increasing the amount of light per unit area. Therefore, stronger sunlight 18 enters the daylighting section 30 and reaches the washroom 6B. In addition, the specific configuration, arrangement, quantity, material, etc. of each member and part can be changed as appropriate without departing from the spirit of the present invention. In addition, all of the components shown in the above embodiment are not necessarily required, and can be selected as appropriate. [Explanation of symbols]

[0071] 1: Building 2: Lighting device 4: Exterior wall 10: Ceiling 18: Sunlight (natural light) 20: Balcony 22: Handrail 27: Reflective material 28: Light duct 29:Translucent panel 30: Light collecting section 31: Light guide section 32: Light emitting part 42: Rotation axis 46: Electric motor (drive source) 47: Control device

Claims

1. A lighting device for introducing natural light into a building, At least one reflecting member that is provided outdoors and reflects the natural light toward an indoor ceiling; a light duct provided on the ceiling, the light duct including a light collecting section that collects the natural light reflected from the reflecting member, and a light emitting section that emits the natural light collected by the light collecting section at a predetermined position; The light collecting device, wherein the reflecting member and the light duct are provided on the same floor.

2. The reflecting member is plate-shaped, The daylight collecting device according to claim 1 , wherein the reflective member is provided on a handrail of a balcony that protrudes outward from an exterior wall of the building.

3. The lighting device according to claim 2 , wherein the plurality of reflecting members are disposed vertically spaced apart from each other.

4. The lighting device according to claim 2 or 3, wherein the reflecting member is provided rotatably about a rotation axis along an extension direction of the handrail.

5. The light collecting device according to claim 4 , further comprising: a drive source for changing a rotation angle of the reflecting member; and a control device for controlling the drive source.

6. The daylight collecting device according to claim 5 , wherein the control device changes the rotation angle of the reflecting member based on the latitude and longitude of the building and the date and time.

7. The lighting device according to claim 2 or 3, wherein at least the reflecting surface of the reflecting member is curved in a direction that is convex upward in the extending direction of the handrail.

8. The light collecting device according to claim 1 , wherein the light duct further includes a light guiding section that guides the natural light collected from the light collecting section to the light emitting section, and the light collecting section is formed wider than the light guiding section.

9. A lighting device for introducing natural light into a building, a plurality of plate-shaped reflective members that are provided outdoors and that reflect the natural light toward an indoor ceiling; The lighting device includes a plurality of reflecting members spaced apart from one another vertically and provided on a railing of a balcony that protrudes outward from the exterior wall of the building.

10. The daylight collecting device according to claim 3 or claim 9, further comprising a light-transmitting panel provided on the indoor side of the reflecting member.

Images