JPWO2018101393A1 - Daylighting system - Google Patents

Abstract

The daylighting system includes a daylighting member having a plurality of daylighting parts having light transmittance, a spacer member provided above the daylighting member, and arranged at a position where the upper end of the daylighting member is lowered a predetermined distance from the mounting surface, Is provided. Each of the plurality of daylighting units has a reflecting surface that selectively reflects light toward the upper side of the horizontal plane passing through the light incident position on the daylighting unit.

Description

One aspect of the present invention relates to a daylighting system.
This application claims priority about Japanese Patent Application No. 2006-232983 for which it applied to Japan on November 30, 2016, and uses the content here.

  Patent Document 1 discloses a window system for taking sunlight into a room through a window or the like of a building. The window system described in Patent Document 1 includes a first protective plate and a second protective plate having light transmittance, a light guide film disposed in a housing space between the first protective plate and the second protective plate, It has. In the light guide film, a plurality of fine structures extending in the horizontal direction are provided in parallel in the vertical direction, and more than half of the emitted light is guided upward.

  In Patent Document 2, a light control member that deflects incident light, a blind having a plurality of slats that transmit or reflect light deflected by the light control member, an adjustment unit that automatically adjusts the inclination of the plurality of slats, There is disclosed a daylighting system comprising: The light control member is disposed at a position above the window of the building, and the blind is disposed on the indoor side of the light control member so as to face the light control member.

  Patent Document 3 discloses a fixed support frame fixed to a fixed surface such as a window frame, a movable support frame disposed in the fixed support frame, a first shielding material disposed in the movable support frame, and a fixed support. There is disclosed a daylight utilization blind including a second shielding member disposed below the frame. In this daylight utilization blind, sunlight can be reflected by the first shielding material by adjusting the inclination angle of the movable support frame, and the ceiling surface can be irradiated.

Japanese Patent No. 5657759 Japanese Patent Laid-Open No. 2006-69988 JP 2012-180638 A

  The daylighting systems disclosed in Patent Documents 1 to 3 are installed around a window of a building or around the window, and deflect sunlight to guide it toward the ceiling of the room. In this type of daylighting system, for example, in order to reduce the power consumption of indoor lighting fixtures, it is required to guide light not only in the vicinity of the window, but also to the back side of the room away from the window, to brighten the entire room. . However, in the above daylighting system, there is a problem that the position of the daylighting member is in contact with the ceiling surface, and the efficiency of guiding light to the back side of the room away from the window is low.

  One aspect of the present invention has been made to solve the above-described problems, and an object thereof is to provide a daylighting system that has an excellent daylighting effect toward the interior side of a room.

In order to achieve the above object, a daylighting system according to one aspect of the present invention includes a daylighting member including a plurality of daylighting units having light transmittance, an upper end of the daylighting member, provided above the daylighting member. A spacer member disposed at a position a predetermined distance below the mounting surface.
Each of the plurality of daylighting units has a reflection surface that selectively reflects light toward the upper side of a horizontal plane passing through the incident position of the light to the daylighting unit.

  In the daylighting system according to one aspect of the present invention, each of the incident light of the light incident on the daylighting unit in the range from 30 degrees to 60 degrees, out of all the emitted light rays from the daylighting unit, to the daylighting unit. The ratio of the incident angle at which the ratio of the light beam emitted toward the upper side of the horizontal plane passing through the incident position of the light beam may exceed 1/2.

  In the daylighting system according to one aspect of the present invention, of the light beams emitted toward the upper side of the horizontal plane, the incidence ratio of light beams having an emission angle of 0 degrees or more and 45 degrees or less exceeds 1/2. The ratio of the angle may exceed 1/2.

  In the daylighting system according to one aspect of the present invention, the spacer member may include an upper light shielding portion.

  In the daylighting system according to one aspect of the present invention, the spacer member may include a transmission diffusion portion.

  In the daylighting system according to one aspect of the present invention, an uneven structure for diffusing the light may be provided on the surface of the transmission diffusion portion.

  In the daylighting system according to one aspect of the present invention, the spacer member may include a support portion having an opening.

  In the daylighting system of one aspect of the present invention, the upper end position of the daylighting member may coincide with the lower end position of a region where direct light is not incident throughout the year at the place where the daylighting system is installed. May be low.

  In the daylighting system according to one aspect of the present invention, the daylighting member is attached to an attachment surface located above the ceiling surface, and the upper end position of the daylighting member substantially coincides with the position of the ceiling surface. Also good.

  The lighting system of one aspect of the present invention may further include a light-shielding portion provided on a plane opposite to the sun with respect to the plane including the daylighting member.

  In the daylighting system according to one aspect of the present invention, the light shielding portion at the same height as the daylighting member may be removed.

  The lighting system of one aspect of the present invention may further include a light-shielding portion provided on a plane on the same side as the sun with respect to the plane including the daylighting member.

  In the daylighting system according to one aspect of the present invention, the light shielding portion at the same height as the daylighting member may be removed.

  The daylighting system according to one aspect of the present invention may further include a lower light-shielding portion provided below the daylighting member.

  In the daylighting system of one aspect of the present invention, the daylighting member includes a plurality of daylighting slats, the spacer member includes a plurality of light shielding slats, and the plurality of daylighting slats and the plurality of light shielding slats are blind. You may comprise.

  According to one aspect of the present invention, it is possible to realize a daylighting system that has an excellent daylighting effect on the interior side of the room.

It is a perspective view of the lighting system of 1st Embodiment. It is a side view of a lighting system. It is a front view of a daylighting slat. FIG. 3B is a cross-sectional view of the daylighting slat along the line A-A ′ in FIG. 3A. It is a figure which shows the simulation result of the lighting effect of the lighting slat. It is sectional drawing of the lighting slat of a modification. It is a figure which shows the simulation result of the lighting effect of the lighting slat of FIG. 4A. It is sectional drawing of the daylighting slat of a comparative example. It is a figure which shows the simulation result of the lighting effect of the lighting slat of FIG. 5A. It is a figure for demonstrating the definition of (DELTA) y, (DELTA) z, and (theta). It is a graph which shows the relationship between (theta) and (DELTA) z / (DELTA) y. It is the graph which compared the lighting effect of the lighting member in the specific date at the time of upper installation, and the time of lower installation. It is a graph in the day different from FIG. 10 is a graph on a different day from FIG. 8 and FIG. 9. It is a graph in the day different from FIGS. It is a perspective view of the lighting system 41 of 2nd Embodiment. It is sectional drawing of the lighting system 41 in case a mounting surface exists in a blind box. It is sectional drawing of the lighting system 41a. It is sectional drawing of the lighting system 41b. It is sectional drawing of the lighting system 41c. It is sectional drawing of the lighting system 41d. It is sectional drawing of the lighting system 41e. It is a perspective view of the lighting system 41f. It is sectional drawing of the lighting system 41f. It is a perspective view of the lighting system 41g. It is a perspective view of the lighting system 41h. It is a perspective view of the lighting system 41i. It is a perspective view of the lighting system of 3rd Embodiment. It is a perspective view of the lighting system of 4th Embodiment. It is a perspective view of the lighting system of 5th Embodiment. It is sectional drawing of the room which installed the lighting system of 6th Embodiment. It is a top view which shows the ceiling of a room. It is a graph which shows the relationship between the illumination intensity of the light (natural light) daylighted indoors by the lighting system, and the illumination intensity by an indoor lighting apparatus.

[First Embodiment]
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
In the first embodiment, an example of a daylight blind including a daylighting slat and a light blocking slat is given as an example of the daylighting system of the present invention.
FIG. 1 is a perspective view of the daylighting system according to the first embodiment.
FIG. 2 is a side view of the daylighting system.

In the following description, the positional relationship (up / down, left / right, front / rear) of each part of the daylighting system is based on the positional relationship (up / down, left / right, front / rear) viewed from the user located in the room, unless otherwise specified. Also, the positional relationship of each part of the daylighting system is the same as the positional relationship on the paper.
Moreover, in the following drawings, in order to make each component easy to see, the scale of the size may be varied depending on the component.

  As shown in FIG. 1, the daylighting system 1 includes a spacer member 2, a daylighting member 3, a lower light shielding portion 4, and a support mechanism 5. The spacer member 2 is a member that is provided above the daylighting member 3 and is arranged at a position where the upper end of the daylighting member 3 is lowered by a predetermined distance from the mounting surface. Here, the mounting surface is a surface on which the daylighting system 1 is mounted, for example, a surface included in a ceiling surface, a blind box, a frame, a sash, a pillar, a handrail, and the like. The daylighting system 1 is attached to the attachment surface regardless of the shape or material of the surface of the attachment surface. In the present embodiment, the spacer member 2 functions as the upper light shielding portion 6 and is composed of a plurality of light shielding slats 7 having light shielding properties.

  The daylighting member 3 is composed of a plurality of daylighting slats 8 having translucency. The lower light shielding portion 4 is composed of a plurality of light shielding slats 7. The light shielding slats 7 constituting the upper light shielding part 6 and the light shielding slats 7 constituting the lower light shielding part 4 may be the same or different. That is, the daylighting system 1 of the present embodiment has a configuration in which a plurality of light shielding slats 7, a plurality of daylighting slats 8, and a plurality of light shielding slats 7 are arranged from top to bottom. In the following description, the daylighting slat 8 and the light shielding slat 7 may be collectively referred to as a slat 9.

The plurality of slats 9 are suspended in the vertical direction (y direction) at intervals.
Each slat 9 is arranged such that the longitudinal direction of the slat 9 is directed in the horizontal direction (x direction). The support mechanism 5 supports a plurality of slats 9 so as to be movable up and down and rotatable about the longitudinal direction of each slat 9. The slat 9 is configured so that the upper side of the slat 9 can be rotated in a direction to fall down to the indoor side.

FIG. 3A is a front view of the daylighting slat 8.
FIG. 3B is a cross-sectional view of the daylighting slat 8 taken along the line AA ′ of FIG. 3A.
As shown in FIGS. 3A and 3B, the daylighting slat 8 includes a base material 11 having light transparency and a plurality of daylighting units 12. The daylighting slat 8 bends the optical path of sunlight incident from outside and emits it toward a predetermined direction in the room.

  The base material 11 is a long plate-like member extending in the horizontal direction (x direction). The base material 11 functions as a support member that supports the plurality of daylighting units 12. The plurality of daylighting units 12 are provided on the first surface 11 a of the base material 11. In the case of the present embodiment, the first surface 11a of the substrate 11 is an outdoor surface, and the second surface 11b of the substrate 11 is an indoor surface. Therefore, the plurality of daylighting units 12 are provided on the outdoor side of the base material 11. However, the plurality of daylighting units 12 may be provided on the indoor side of the base material 11. Moreover, the some lighting part 12 may be a different body from the base material 11, and may be formed integrally.

  As the base material 11, for example, a light-transmitting base material made of a resin such as a thermoplastic polymer, a thermosetting resin, or a photopolymerizable resin is used. A light-transmitting substrate made of acrylic polymer, olefin polymer, vinyl polymer, cellulose polymer, amide polymer, fluorine polymer, urethane polymer, silicone polymer, imide polymer, or the like is used. Specifically, for example, triacetyl cellulose (TAC), polyethylene terephthalate (PET), cycloolefin polymer (COP), polycarbonate (PC), polyethylene naphthalate (PEN), polyethersulfone (PES), polyimide (PI) A light-transmitting plate material such as is preferably used. In addition, the substrate 11 may be a glass substrate. The thickness of the base material 11 is arbitrary. Also, a laminated structure in which a plurality of materials are laminated may be used. 90% or more of the total light transmittance of the base material 11 is preferable by prescription | regulation of JISK7361-1. Thereby, sufficient transparency can be obtained.

  The dimension (slat length) L in the longitudinal direction of the daylighting slat 8 is, for example, about 50 mm to 3000 mm. The dimension (slat width) W1 in the short direction of the daylighting slat 8 is, for example, about 15 mm to 35 mm. The thickness T of the daylighting slat 8 is, for example, about 0.1 mm to 3 mm.

  As shown in FIG. 3B, each of the plurality of daylighting units 12 has light transparency. The space 14 is a space provided between two adjacent daylighting portions 12, and air exists in this space. In FIG. 3B, only five daylighting units 12 are shown, but actually more daylighting units 12 are provided.

  The daylighting unit 12 is made of an organic material having light transmissivity and photosensitivity such as acrylic resin, epoxy resin, and silicone resin. Alternatively, a material in which a polymerization initiator, a coupling agent, a monomer, an organic solvent, or the like is mixed with these organic materials can be used. Furthermore, the polymerization initiator contains various additive components such as a stabilizer, an inhibitor, a plasticizer, a fluorescent brightening agent, a release agent, a chain transfer agent, and other photopolymerizable monomers. Also good. In addition, materials described in Japanese Patent No. 41299991 can be used. 90% or more of the total light transmittance of the lighting part 12 is preferable by prescription | regulation of JISK7361-1. Thereby, sufficient transparency can be obtained.

  As shown in FIGS. 3A and 3B, each of the plurality of daylighting units 12 extends in the longitudinal direction (x direction) of the daylighting slat 8. The plurality of daylighting units 12 are provided side by side in the short direction (y direction) of the daylighting slats 8. Each daylighting section 12 is a triangular prism-shaped transparent structure. That is, the shape of the cross section perpendicular to the longitudinal direction of the daylighting portion 12 is a triangle. The daylighting unit 12 changes the direction of incident sunlight in the vertical plane. Note that the shape of the daylighting unit 12 is not limited to a triangular column shape, and may be a polygonal column shape other than the triangular column, and is not particularly limited.

  The daylighting unit 12 includes a first surface 12 a that mainly functions as a reflecting surface that reflects incident light, a second surface 12 b that mainly functions as an incident surface on which sunlight enters, and a first surface 11 a of the base 11. A third surface 12c in contact with.

  The sunlight L which permeate | transmitted the window glass injects into the lighting part 12, and several paths | routes inject | emits from the base material 11 can be considered, but FIG. 3B shows a typical path | route. As shown in FIG. 3B, when the sunlight L that has passed through the window glass (not shown) enters the daylighting unit 12 from the second surface 12b, the sunlight L is reflected by the first surface 12a, and then enters the base material 11 and then the base. Injected from the second surface 11 b of the material 11.

  In this example, air exists between the adjacent daylighting portions 12, and this portion constitutes the gap portion 14. Instead of this configuration, another low refractive index material may be filled between the adjacent daylighting units 12. However, the difference in refractive index at the interface between the daylighting portion 12 and the gap portion 14 is maximized when air is present rather than when any low refractive index material is present in the gap portion 14. Therefore, when there is air in the gap 14 between the adjacent daylighting parts 12, light totally reflected by the first surface 12a out of the sunlight L incident on the daylighting part 12 according to Snell's law. The critical angle of becomes the smallest.

  In this case, since the range of the incident angle of the light L totally reflected by the first surface 12a becomes the widest, the light incident on the daylighting unit 12 can be efficiently guided to the second surface 11b side of the base material 11. . As a result, the loss of the light L incident on the daylighting unit 12 is suppressed, and the intensity of the light emitted from the second surface 11b of the substrate 11 can be increased.

  It is desirable that the refractive index of the base material 11 and the refractive index of the daylighting unit 12 be substantially the same. That is, it is desirable that the base material 11 and the daylighting unit 12 are integrally formed. For example, when the refractive index of the base material 11 and the refractive index of the daylighting unit 12 are significantly different, when the light L is incident on the base material 11 from the daylighting unit 12, it is unnecessary at the interface between the daylighting unit 12 and the base material 11. Light refraction or reflection may occur. In this case, there is a possibility that problems such as failure to obtain desired lighting characteristics and a decrease in luminance may occur.

  As shown in FIG. 2, the light shielding slat 7 blocks the light L incident from the outdoor side. The light shielding slat 7 has a function of blocking light by an action such as reflection and absorption, and is made of a material such as a metal such as aluminum, a resin, or wood.

  As shown in FIG. 1, the support mechanism 5 includes a plurality of ladder cords 16 extending in the vertical direction (y direction), a lifting cord 17 for raising and lowering the plurality of slats 9, and a plurality of ladder cords 16. And a head box 18 that supports the upper end of the lifting / lowering cord 17 and a plurality of ladder cords 16 and a lifting / lowering bar 19 that is attached to the lower ends of the lifting / lowering cords 17.

  An operation code 22 is provided as the lifting operation unit 20. An operation lever 23 is provided as the tilt operation unit 24. A drive mechanism (not shown) is accommodated in the head box 18. The drive mechanism includes a rotating drum (not shown) that rotates each slat 9, a lifting drum (not shown) that raises and lowers the plurality of slats 9, and the like.

FIG. 3C is a diagram showing a simulation result of the daylighting effect of the daylighting slat 8.
The present inventors performed simulation of the light emission path using the daylighting slat 8 of the present embodiment having the triangular columnar daylighting section 12.
As simulation conditions, the refractive index of the base material 11 and the daylighting unit 12 was 1.59, the angle α of the daylighting unit 12 was 67 degrees, the angle β was 66 degrees, and the pitch P of the daylighting section 12 was 1 mm. Further, the incident angle θin of the light with respect to the horizontal plane H was changed in four ways in the range from 30 degrees to 60 degrees. Specifically, the simulation was performed by setting the light incident angle θin to 30 degrees, 40 degrees, 50 degrees, and 60 degrees, respectively. In this simulation, Fresnel reflection on the surface of the daylighting slat 8 is not taken into consideration, but the influence of Fresnel reflection is slight, and the result does not change in the end.

Here, the angle formed between the light emission direction and the horizontal plane is defined as the light emission angle θout. Here, when light is emitted above the horizontal plane, the emission angle θout is expressed as a positive value, and when light is emitted below the horizontal plane, the emission angle θout is expressed as a negative value.
In FIG. 3C, the ceiling surface is indicated by a symbol T, and the window surface is indicated by a symbol M.

  As shown in FIG. 3C, when the daylighting slat 8 of this embodiment is used, the emission angle θout is −3 degrees when the light incident angle θin is 30 degrees. The emission angle θout was +6 degrees when the light incident angle θin was 40 degrees. The emission angle θout was +16 degrees when the light incident angle θin was 50 degrees. The emission angle θout was +26 degrees when the light incident angle θin was 60 degrees. Under these simulation conditions, light is emitted above the horizontal plane at three incident angles θin out of four incident angles θin obtained by dividing the range of incident angles θin of 30 to 60 degrees in 10 degree increments.

  That is, in the daylighting slat 8 of the present embodiment, each of the light beams incident on the daylighting unit 12 out of all the emitted light rays from the daylighting unit 12 in the range of the incident angle of light incident on the daylighting unit 12 from 30 degrees to 60 degrees. The ratio of the incident angle θin in which the ratio of the light beam emitted toward the upper side of the horizontal plane H passing through the incident position of the light beam exceeds 1/2 is more than 1/2. As described above, the first surface 12 a of the daylighting unit 12 that functions as a reflection surface selectively reflects light toward the upper side of the horizontal plane H that passes through the light incident position on the daylighting unit 12.

  In the above example, the range of incident angles from 30 degrees to 60 degrees is divided in 10 degree increments, and light beams are emitted above the horizontal plane H at three or more incident angles θin of the four incident angles. If the ratio exceeds ½, the condition of this embodiment is satisfied. However, it is not necessarily limited to 10 degrees. For example, the range of the incident angle of 30 degrees to 60 degrees is divided in increments of 1 degree, and the ratio of light rays emitted above the horizontal plane H is 1 / at the incident angle θin of 16 or more of the 31 incident angles. If it exceeds 2, it is good also as satisfy | filling the conditions of this embodiment.

  Further, in the actual simulation, a specific incident angle is discretely selected from the range of incident angles of 30 degrees to 60 degrees, but “of all the emitted light rays from the daylighting portion, The concept that “the ratio of the incident angle in which the ratio of the light beam emitted toward the upper side of the horizontal plane passing through the incident position exceeds ½” exceeds ½ ”is a continuous range of incident angles in the range of 30 degrees to 60 degrees. It may be taken as a value. Considering the example of 10 degree increments described above, at an incident angle of 40 degrees, which is smaller than 45 degrees, which is the center of 30 degrees to 60 degrees, the ratio of light rays emitted above the horizontal plane exceeds 1/2. Therefore, even if it is considered as a continuous value within the range of the incident angle of 30 degrees to 60 degrees, the ratio of the incident angle in which the ratio of the light beam emitted upward from the horizontal plane exceeds 1/2 is 1/2. Estimated to exceed.

  Furthermore, in the daylighting slat 8 of the present embodiment, of the light rays emitted upward from the horizontal plane H, the proportion of the light rays having an emission angle θout of 0 ° or more and + 45 ° or less exceeds 1/2. The angle ratio exceeds 1/2.

FIG. 4A is a cross-sectional view of a modified daylighting slat 31.
As shown in FIG. 4A, a daylighting slat 31 including a plurality of reflectors 32 extending in the horizontal direction is considered as a daylighting slat 31 of a modification. The thickness of the reflecting plate 32 is 0.5 mm, the interval between the reflecting plates 32 is 0.1 mm, and the length of the reflecting plate 32 is 1 mm. In the lighting slat 31 of the modified example, the light is regularly reflected on the surface of the reflecting plate 32 and guided to the room.

FIG. 4B is a diagram illustrating a simulation result of the lighting effect of the lighting slat 31 of the modification.
When the daylighting slat 31 of the modification was used, the emission angle θout was +30 degrees when the light incident angle θin was 30 degrees. Further, when the light incident angle θin is 40 degrees, the emission angle θout is +40 degrees. The emission angle θout was +50 degrees when the light incident angle θin was 50 degrees. The emission angle θout was +60 degrees when the light incident angle θin was 60 degrees. Under these simulation conditions, light is emitted above the horizontal plane H at all four incident angles θin obtained by dividing the range of incident angles θin of 30 to 60 degrees into 10 degree increments.

  Further, in the daylighting slat 31 of the modification, unlike the daylighting slat 8 of the present embodiment, among the light rays emitted upward from the horizontal plane H, the emission angle θout is 0 degree or more and +45 degree or less. The ratio of the incident angle θin where the ratio of light rays exceeds 1/2 does not exceed 1/2.

FIG. 5A is a cross-sectional view of a daylighting slat 101 of a comparative example.
As shown in FIG. 5A, a daylighting slat composed of a light diffusion plate 102 is considered as the daylighting slat 101 of the comparative example. The refractive index of the light diffusion plate 102 is 1.59. In the daylighting slat 101 of the comparative example, light isotropically diffuses while being transmitted through the light diffusion plate 102 and is guided indoors.

FIG. 5B is a diagram illustrating a simulation result of the lighting effect of the lighting slat 101 of the comparative example.
When the lighting slat 101 of the comparative example is used, light is diffused isotropically, so that almost half of the light emitted from the light diffusion plate 102 is emitted above the horizontal plane.

  As described above, among the three types of daylighting slats that have been simulated, the daylighting slat 8 of the present embodiment emits light toward the ceiling surface T at a position away from the window, and the daylighting slats 31 of the modified example. Emits light toward the ceiling surface T closer to the window than the daylighting slat 8 of the present embodiment. Further, since the daylighting slat 101 of the comparative example emits light isotropically in all directions, approximately half of the emitted light is emitted toward the ceiling surface T.

  As in the case of the daylighting slat 8 of the present embodiment and the daylighting slat 31 of the modified example, if the daylighting slat has an amount of light emitted above the horizontal plane exceeding 1/2 of the total amount of emitted light, the incident position of the light, That is, by lowering the positions of the daylighting slats 8 and 31 from the ceiling surface T, the light guiding effect to the back of the room can be enhanced. Furthermore, when the daylighting slat 8 of this embodiment and the daylighting slat 31 of the modification are compared, as the daylighting slat 8 of this embodiment has a larger amount of light emitted at an angle closer to the horizontal direction, The light guiding effect is increased.

As shown in FIG. 6, when the height of the incident point P of the light L from the ceiling surface T is Δy, the arrival distance of the light L from the window surface M is Δz, and the emission angle of the light L is θout, Δy , Δz, and θout are expressed by the following equation (1).
Δz / Δy = 1 / tan (θout) (1)

  When a graph is written with θout (degrees) in equation (1) as the horizontal axis and Δz / Δy as the vertical axis, the result is as shown in FIG. As shown in FIG. 7, when θout ≦ 45 degrees, Δz / Δy ≧ 1, and if the light incident position, that is, the installation position of the daylighting slat is lowered by Δy, the light reaching distance from the window surface M is Δz. It becomes longer by (≧ Δy). Further, as θout decreases from 45 degrees, the degree of increase in Δz increases. On the other hand, although not shown in FIG. 8, when θout is larger than 45 degrees, Δz / Δy <1, and the degree of change of Δz / Δy becomes small.

Next, the present inventors compared the illuminance distribution in the room by simulation with the case where the daylighting member was installed in the upper part and the case where it was installed in the lower part at four different dates of the year.
The simulation conditions are as follows. In a room facing south in Tokyo, the window glass is a transparent single plate with a thickness of 5 mm, the width of the room is 10 m, the depth of the room is 10 m, and the height of the ceiling is 2.8 m. did. The width of the window glass and the daylighting member was 10 m, the same as the width of the room, and the height of the window glass was 2.8 m, the same as the height of the ceiling. In addition, the area other than the installation area of the daylighting member is completely shielded from light by the blind. When the vertical dimension of the daylighting member is 10 cm, the daylighting member is installed in the range of 0 to 10 cm measured from the ceiling surface, and the upper part is installed, and the daylighting member is installed in the range of 70 to 80 cm measured from the ceiling surface Was installed at the bottom.
The date and time was 11:30 am on February 10, March 10, April 6, and December 21.

  The vertical surface illuminance and the total sky illuminance were calculated based on data from Tokyo in the average year of NEDO's METPV-11. The solar altitude is represented by θ (degrees), and the solar orientation is represented by φ (degrees). The solar altitude θ was 0 degrees on the ground plane, and the solar direction φ was 180 degrees true south.

The vertical surface direct illuminance and total sky illuminance on each day were as follows.
December 21 (θ, φ) = (31,178), (vertical surface direct illuminance, vertical surface total sky illuminance) = (71723 [Lx], 22958 [Lx])
February 10 ... (θ, φ) = (39,172), (vertical surface direct illuminance, vertical surface total sky illuminance) = (65409 [Lx], 27717 [Lx])
March 10 (θ, φ) = (50,172), (vertical surface direct illuminance, vertical surface total sky illuminance) = (55223 [Lx], 29497 [Lx])
April 6 ... (θ, φ) = (60,173), (vertical surface direct illuminance, vertical surface total sky illuminance) = (42260 [Lx], 30061 [Lx])

FIG. 8 is a graph comparing the indoor illuminance distribution on December 21 between the upper installation and the lower installation. Similarly, FIG. 9 is a graph of illuminance distribution on February 10, FIG. 10 is a graph of illuminance distribution on March 10, and FIG. 11 is a graph of illuminance distribution on April 6.
In all the graphs, the horizontal axis is the distance (m) from the window, and the vertical axis is the illuminance (lx). Moreover, the graph of the code | symbol A shows the illuminance distribution at the time of upper installation, and the graph of code | symbol B shows the illuminance distribution at the time of lower installation.

  According to the ray tracing simulation, on February 10th, March 10th, and April 6th, light was emitted above the horizontal plane. In this case, as shown in FIGS. 9 to 11, when the daylighting member is installed on the lower side (graph B), the interior of the room is deeper than when the daylighting member is installed on the upper side (graph A). It turned out that the illuminance on the side increased and light was guided to the back of the room. On the other hand, on December 21, light was emitted slightly downward from the horizontal plane and guided to the wall at the back of the room. In this case, as shown in FIG. 8, it has been found that the illuminance distribution of light does not change much between the case of the upper side installation and the case of the lower side installation. Therefore, from a comprehensive viewpoint, it can be said that the illuminance on the back side of the room is higher when the daylighting member is installed on the lower side than when the daylighting member is installed on the upper side.

  As described above, in the daylighting system 1 of this embodiment, the daylighting member 3 including the plurality of daylighting slats 8 is provided at a predetermined distance from the ceiling surface T by providing the spacer member 2 including the plurality of light shielding slats 7. It is placed in a lowered position. Thereby, the light collected indoors can be guided to the back of the room without increasing the daylighting area. As a result, the daylighting system 1 can brighten the entire room without increasing costs, and can contribute to reducing the power consumption of the indoor lighting fixture.

  In the case of the present embodiment, not only the position of the daylighting member 3 is simply lowered, but the upper side light-shielding portion 6 including a plurality of light-shielding slats 7 is provided above the daylighting member 3. Inflow of light and heat can be prevented. As a result, it is difficult for people in the room to feel dazzling or hot.

  In the case of the present embodiment, a plurality of light shielding slats 7, a plurality of daylighting slats 8, and a plurality of light shielding slats 7 are connected as a series of slats 9 to constitute an integral daylighting blind. Therefore, like a general blind, it can be easily installed in the vicinity of a window and has excellent design.

  In the place where the daylighting system 1 is installed, there may be a region where direct light is not incident throughout the year, for example, by being blocked by surrounding buildings or fences. Therefore, it is desirable that the position of the upper end of the daylighting member 3 coincides with or is lower than the lower end position of a region where direct light does not enter throughout the year at the place where the daylighting system 1 is installed.

  Since the daylighting slat 8 needs to process the plurality of daylighting units 12 in the manufacturing process, the manufacturing cost is higher than that of the general light shielding slat 7. From this point of view, when the daylighting slat 8 is provided in a region where no direct light is incident, the function of the daylighting slat 8 cannot be achieved, and the manufacturing cost is unnecessarily increased. Therefore, it is desirable that the upper end of the daylighting member 3 is located below the lower end of the region where the direct light is not incident or below the lower end.

[Second Embodiment]
Hereinafter, a second embodiment of the present invention will be described with reference to FIGS. 12A to 12L. 12A to 12L, the same reference numerals are given to the same components as those used in the first embodiment, and the description thereof will be omitted. FIG. 12A is a perspective view of the daylighting system 41 of the second embodiment.

  In the daylighting system 1 of the first embodiment, the spacer member 2 is composed of the upper light-shielding portion 6 including a plurality of light-shielding slats 7. The daylighting member 3 is composed of a plurality of daylighting slats 8. On the other hand, as shown in FIG. 12A, the daylighting system 41 of the second embodiment includes a daylighting member 45 and a spacer member 42a. The spacer member 42 a includes, for example, a frame (support portion) 48 having an opening 400 on the inside. The spacer member 42 a may have any shape as long as it secures a space between the mounting surface 402 and the daylighting member 45.

  The daylighting member 45 includes a frame 49 having an opening, and a daylighting panel 46 fitted into the opening of the frame 49. The daylighting panel 46 is, for example, a plate material including a plurality of daylighting units similar to the daylighting slats 8 of the first embodiment.

  The daylighting system 41 is fixed to the mounting surface 402 via, for example, the head box 18. Further, the lighting system 41 may directly fix the upper portion of the frame 48 to the mounting surface 402. As a method for fixing the daylighting system 41, for example, a method using screws, an adhesive, a magnet, Velcro (registered trademark), or the like can be considered.

In the daylighting system 41, it is desirable that the direct light is not incident on the spacer member 42a throughout the year. This is because when the direct light is incident on the spacer member 42a, the direct light passes through the opening 400 as it is, and there is a possibility that a person in the room feels dazzling.
In FIG. 12A, the head box 18 may not be provided.

  FIG. 12B is a cross-sectional view of the lighting system 41 when the mounting surface 402 is in the blind box 404. The blind box 404 is a recess provided in a portion of the ceiling near the window in order to make it difficult to see a mounting portion such as a blind, a screen, and a curtain from the room. When the daylighting system 41 is attached to the blind box 404, it is desirable that the lower end of the spacer member 42a or the upper end of the daylighting panel 46 is substantially aligned with the lower end of the ceiling 401. This prevents direct light incident from the window 403 from directly entering the room through the opening 400, and makes it difficult to see the spacer portion 42a from the room, thereby providing a daylighting system with excellent design. I can do it.

  12C to 12G are cross-sectional views showing the positional relationship between the daylighting member 45 and the light shielding portions 43a to 43c of the daylighting systems 41a to 41e having the light shielding portions. Since the daylighting member 45 emits light toward the ceiling surface, it is desirable that the daylighting member 45 be disposed above the person's eye line so as not to make the person feel dazzling. Moreover, it is desirable that the daylighting systems 41 a to 41 e include light shielding portions 43 a to 43 c for shielding at least direct light from the lower part of the daylighting member 45. The light shielding parts 43a to 43c may reflect light like a blind, or may transmit and diffuse light like a lace curtain.

  FIG. 12C is a cross-sectional view of the daylighting system 41a. The daylighting system 41 a includes a spacer member 42 a, a daylighting member 45 attached to the lower part of the spacer member 42 a, and a light blocking portion 43 a disposed on the indoor side of the daylighting member 45. The light shielding portion 43 a includes a plurality of light shielding slats 7 connected by the ladder cord 16 and hangs down from the mounting surface 402 to a position lower than the lower height of the daylighting member 45. In the daylighting system 41a, the light incident on the room from the daylighting system 41a can be adjusted by blocking the direct light incident from below the daylighting member 45 by the light blocking portion 43a and adjusting the angle of the light blocking slat 7. Further, the daylighting system 41a is arranged near the window 403, so that the shadow reflected by the eyelids or the sash on the daylighting member 45 can be reduced, and the amount of the daylighting can be increased.

  FIG. 12D is a cross-sectional view of the daylighting system 41b. The daylighting system 41b includes a spacer member 42a, a daylighting member 45 attached to the lower part of the spacer member 42a, and a light blocking portion 43b arranged on the indoor side of the daylighting member 45. The light shielding portion 43 b includes a plurality of light shielding slats 7 connected by the ladder cord 16 and hangs down from the mounting surface 402 to a position lower than the lower height of the daylighting member 45. The light shielding portion 43b is configured such that the light shielding slats 7 are not disposed at the same height as the daylighting member 45. In the daylighting system 41b, since the incident light from the daylighting member 45 is not hindered by the light blocking slats 7, the amount of light collected indoors can be increased.

  FIG. 12E is a cross-sectional view of the daylighting system 41c. The daylighting system 41 c includes a spacer member 42 a, a daylighting member 45 attached to the lower part of the spacer member 42 a, and a light blocking portion 43 a disposed outside the daylighting member 45. When the light shielding part 43a reflects light like a blind, by installing the light shielding part 43a on the outdoor side, a higher heat shielding function can be realized in a high temperature season such as summer. In addition, since the daylighting member 45 with high luminance is installed on the indoor side, a sense of brightness can be felt when viewed from the room.

  FIG. 12F is a cross-sectional view of the daylighting system 41d. The daylighting system 41d includes a spacer member 42a, a daylighting member 45 attached to the lower part of the spacer member 42a, and a light blocking portion 43b disposed outside the daylighting member 45. The light shielding portion 43b is configured such that the light shielding slats 7 are not disposed at the same height as the daylighting member 45. In the daylighting system 41d, the incident light to the daylighting member 45 is not hindered by the light blocking slats 7, so that the amount of light collected indoors can be increased. In the daylighting system 41d, the ladder cord 16 exposed in the region where the light shielding slats 7 of the light shielding portion 43b are not disposed is hidden by the daylighting member 45, so that the appearance from the indoor side is improved.

  FIG. 12G is a cross-sectional view of the daylighting system 41e. The daylighting system 41e includes a spacer member 42a, a daylighting member 45 attached to the lower part of the spacer member 42a, and a light shielding part 43c attached to the lower part of the daylighting member 45. The light shielding part 43 c is configured to include a plurality of light shielding slats 7. In the daylighting system 41e, the direct light that is about to enter the room from the lower side of the daylighting member 45 is blocked by the light blocking portion 43c, and the overall sense of unity of the daylighting system 41e is increased and the appearance is improved.

  Also in the second embodiment, a daylighting system that can guide light to the back of the room can be realized. In addition, when the spacer member 42a is composed of only a frame, the cost can be reduced.

[First Modification of Second Embodiment]
Hereinafter, a first modification of the second embodiment of the present invention will be described with reference to FIGS. 12H and 12I. 12H is a perspective view of the daylighting system 41f, and FIG. 12I is a cross-sectional view of the daylighting system 41f.

The daylighting system 41f includes a spacer member 42b and a daylighting member 45 attached to the lower part of the spacer member 42b.
The spacer member 42b includes a suspension member 405 that suspends the daylighting member 45. The shape of the suspension member 405 is, for example, a plate shape, a string shape, or a rod shape. The suspension member 405 can be formed of, for example, a metal such as aluminum or SUS, resin, wood, fiber, or the like. The suspension member 405 is fixed by, for example, having a structure that is screwed or hooked to the mounting surface 402 and the daylighting member 45. The daylighting system 41f differs from the second embodiment only in whether the spacer member 42b is made of the frame 48 or the suspension member 405, and can take the same form other than that.

The daylighting system 41f is easy to install because the spacer member 42b is formed by the suspension member 405, and the weight and cost of the entire daylighting system 41f can be reduced.
In FIG. 12H, the head box 18 may not be provided.

[Second Modification of Second Embodiment]
Hereinafter, a second modification of the second embodiment of the present invention will be described with reference to FIG. 12J. FIG. 12J is a perspective view of the daylighting system 41g. The daylighting system 41g includes a spacer member 42c and a daylighting member 45 attached to the lower part of the spacer member 42c. The spacer member 42 c includes a frame 48 and a light shielding panel 43 fitted in the opening of the frame 48. The light shielding panel 43 is a plate material having light shielding properties, and is an upper light shielding portion 44 that shields the upper side of the daylighting member 45. About a part other than this, the structure similar to the lighting system of 2nd Embodiment can be taken.

The daylighting system 41g can guide light to the back of the room without increasing costs. Moreover, the same effect as 1st Embodiment that the inflow of the light and heat from the upper part of the lighting member 45 can be blocked | prevented is acquired.
In FIG. 12J, the head box 18 may not be provided.

[Third Modification of Second Embodiment]
FIG. 12K is a perspective view of the daylighting system 41h. The daylighting system 41h includes a spacer member 42d and a daylighting member 45 attached to the lower part of the spacer member 42d. The spacer member 42 d includes a frame 48 and a transmission diffusion portion 406 that is fitted into the opening of the frame 48. The transmission diffusion unit 406 is constituted by a diffusion panel, for example. A diffusion panel can be comprised by what contained the diffusion particle which has a refractive index different from the refractive index of a transparent plate in the inside of a transparent plate, for example.

Even in the daylighting system 41h, a daylighting system capable of guiding light to the back of the room can be realized without increasing costs. Further, by arranging the transmission diffusion portion 406 in a part of the region where the light is incident, the amount of light collected into the room can be increased as compared with the case where the upper light-shielding portion is used. Moreover, since the light taken in the room is diffused by the transmission diffusion unit 406, the person in the room does not feel so dazzling.
In FIG. 12K, the head box 18 may not be provided.

[Fourth Modification of Second Embodiment]
FIG. 12L is a perspective view of the daylighting system 41i. The daylighting system 41 i includes a spacer member 42 c, a daylighting member 45, and the lower light shielding part 4. The spacer member 42 c is an upper light shielding portion 44. The lower light-shielding part 4 has a plurality of light-shielding slats 7. The plurality of light shielding slats 7 constituting the lower light shielding part 4 can be folded to the daylighting member 45 side (upward). Other configurations are the same as those of the first embodiment.

  Even in the daylighting system 41i, a daylighting system that can guide light to the back of the room without increasing costs can be realized. Moreover, the same effect as 1st Embodiment that the inflow of the light and heat from the upper part of a lighting member can be prevented is acquired.

[Third Embodiment]
Hereinafter, a third embodiment of the present invention will be described with reference to FIG.
Unlike the first embodiment, the daylighting system of the third embodiment includes a light-shielding blind and a daylighting film.
FIG. 13 is a perspective view of the daylighting system of the third embodiment.
In FIG. 13, the same components as those used in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  As shown in FIG. 13, the daylighting system 51 of this embodiment includes a daylighting film 52 (daylighting member) and a light-shielding blind 53. In the first and second embodiments, the spacer member, the daylighting member, and the lower light-shielding portion are all configured integrally. On the other hand, in the third embodiment, the daylighting film 52 and the light-shielding blind 53 are configured as separate members. The daylighting film 52 is attached to the window. The shading blind 53 is suspended from the front side (inside the room) of the window.

  The light shielding blind 53 includes a plurality of light shielding slats 7. The plurality of light shielding slats 7 are disposed at positions above and below the daylighting film 52 and are not disposed at positions corresponding to the front side of the daylighting film 52. The light shielding slat 7 at a position above the daylighting film 52 and the light shielding slat 7 at a position below the daylighting film 52 are connected to each other, and can be rotated or lifted by a common slat rotation / lifting operation unit (not shown). Executed.

  Further, the light shielding slat 7 at a position above the daylighting film 52 constitutes the upper light shielding part 55 and functions as a spacer member 56 for arranging the upper end of the daylighting film 52 at a position lower than the ceiling surface T by a predetermined distance.

  In the third embodiment, the same effect as that of the first embodiment can be obtained, such that the daylighting system 51 that can guide light to the back of the room can be realized without increasing the cost.

[Fourth Embodiment]
Hereinafter, a fourth embodiment of the present invention will be described with reference to FIG.
As in the third embodiment, the daylighting system of the fourth embodiment includes a light-shielding blind and a daylighting film.
FIG. 14 is a perspective view of the daylighting system of the fourth embodiment.
14, the same code | symbol is attached | subjected to the same component as FIG. 13 used in 3rd Embodiment, and description is abbreviate | omitted.

As shown in FIG. 14, the daylighting system 61 of this embodiment includes a daylighting film 52 (daylighting member) and a light-shielding blind 62. The daylighting film 52 and the light-shielding blind 62 are configured as separate members. The daylighting film 52 is attached to the window.
The shade blind 62 is suspended from the front side (inside the room) of the window.

  In the light-shielding blind 53 of the third embodiment, the plurality of light-shielding slats 7 are not arranged at positions in front of the daylighting film 52. On the other hand, in the light-shielding blind 62 of the fourth embodiment, the plurality of light-shielding slats 7a and 7b are disposed not only at positions above and below the daylighting film 52 but also at positions near the daylighting film 52. . However, the light shielding slats 7a located above and below the daylighting film 52 and the light shielding slats 7b located near the daylighting film 52 can be operated independently.

  Also in the fourth embodiment, the light shielding slat 7a located above the daylighting film 52 constitutes the upper light shielding part 55, and the spacer member 56 for arranging the upper end of the daylighting film 52 at a position lower than the ceiling surface by a predetermined distance. Function as.

  Therefore, as shown in FIG. 14, the light shielding slats 7a at positions above and below the daylighting film 52 can be closed, and the light shielding slats 7b at the position near the daylighting film 52 can be opened. In this state, the daylighting system 61 can take outdoor light indoors and guide it in the direction of the ceiling. In addition, when it is not desired to take outdoor light indoors, only the light shielding slat 7b in the position corresponding to the front side of the daylighting film 52 from the state shown in FIG.

  Also in the fourth embodiment, the same effect as that of the first embodiment can be obtained that the daylighting system 61 that can guide light to the back of the room can be realized without increasing the cost.

  In the present embodiment, the light shielding slats 7a and the light shielding slats 7b may be configured to operate in conjunction with each other.

[Fifth Embodiment]
Hereinafter, a fifth embodiment of the present invention will be described with reference to FIG.
In the fifth embodiment, as an example of the daylighting system of the present invention, an example of a daylighting roll screen including a daylighting screen and a light shielding screen will be given.

  As shown in FIG. 15, the daylighting system 71 of the fifth embodiment includes a screen 72 and a support member 73 that supports the screen 72 so that the screen 72 can be wound or pulled out. The screen 72 has a configuration in which a light shielding screen 74, a daylighting screen 75, and a light shielding screen 74 are sequentially connected from top to bottom. The upper light shielding screen 74 constitutes the upper light shielding portion 76 and functions as a spacer member 77 for arranging the upper end of the daylighting screen 75 at a position lower than the ceiling surface by a predetermined distance.

  In the fifth embodiment, the same effect as that of the first embodiment can be obtained, such that the daylighting system 71 capable of guiding light to the back of the room can be realized without increasing the cost.

  In particular, in the case of the present embodiment, since the light shielding screen 74, the daylighting screen 75, and the light shielding screen 74 are integrated to form the screen 72, the daylighting system 71 having excellent design can be realized. Further, the vertical position of the daylighting screen 75 can be freely changed by appropriately changing the dimensions of the upper and lower light shielding screens 74. As the screen, various forms such as a honeycomb screen and a pleated screen can be considered in addition to the roll screen of the present embodiment. The light shielding screen 74 can be added with various functions such as heat shielding and fire prevention, and may be a lace curtain.

[Lighting system]
FIG. 16 is a diagram illustrating a room model 2000 including the daylighting system 2010, and is a cross-sectional view taken along the line JJ ′ of FIG.
FIG. 17 is a plan view showing the ceiling of the room model 2000.

  The ceiling material constituting the ceiling 2003a of the room 2003 into which sunlight is introduced desirably has high light reflectivity. As shown in FIGS. 16 and 17, a light-reflective ceiling material 2003 </ b> A is installed on the ceiling 2003 a of the room 2003 as a light-reflective ceiling material. The light-reflective ceiling material 2003A facilitates the introduction of external light from the daylighting system 2010 installed in the window 2002 toward the back of the room. The light-reflective ceiling material 2003A is installed on the ceiling 2003a near the window. Specifically, it is installed in a predetermined area E (an area about 3 m from the window 2002) of the ceiling 2003a.

  As described above, the light-reflective ceiling material 2003A efficiently guides sunlight introduced into the room through the window 2002 in which the daylighting system 2010 including the daylighting system according to any one of the embodiments is installed to the back of the room. . Sunlight introduced from the daylighting system 2010 toward the indoor ceiling 2003a is reflected by the light-reflective ceiling material 2003A and changes its direction to illuminate the desk surface 2005a of the desk 2005 placed in the interior of the room. The effect of brightening the desk top surface 2005a is exhibited.

  The light-reflective ceiling material 2003A may be diffusely reflective or specularly reflective, but has the effect of brightening the desk top surface 2005a of the desk 2005 placed in the interior of the room, and is in the room. In order to achieve both the effects of suppressing glare light that is unpleasant for humans, it is preferable that the characteristics of both are appropriately combined.

  Most of the light introduced into the room by the daylighting system 2010 goes to the ceiling. In general, the amount of light in the vicinity of the window 2002 is often sufficient. Therefore, by using the daylighting system as described above and the light-reflective ceiling material 2003A together, the light incident on the ceiling (region E) near the window is distributed to the back side of the room where the amount of light is small compared to the window. Can do.

  For example, the light-reflective ceiling material 2003A is formed by embossing a metal plate such as aluminum with unevenness of about several tens of micrometers, or by depositing a metal thin film such as aluminum on the surface of a resin substrate on which similar unevenness is formed. Can be produced. Or the unevenness | corrugation formed by embossing may be formed in the curved surface of a larger period.

  Furthermore, by appropriately changing the embossed shape formed on the light-reflective ceiling material 2003A, the light distribution characteristics of light and the distribution of light in the room can be controlled. For example, when embossing is performed in a stripe shape extending to the back side in the room, the light reflected by the light-reflective ceiling material 2003A spreads in the left-right direction of the window 2002 (direction intersecting the longitudinal direction of the unevenness). . When the size and orientation of the window 2002 are limited, using such characteristics, the light reflecting ceiling material 2003A diffuses light in the horizontal direction and reflects it toward the back of the room. be able to.

  The daylighting system 2010 is used as part of the lighting system in the room 2003. The lighting system includes, for example, components of the entire room including a daylighting system 2010, a plurality of indoor lighting devices 2007, a control system thereof, and a light-reflective ceiling material 2003A installed on the ceiling 2003a. .

  A daylighting system 2010 is installed in the window 2002 of the room 2003, a light shielding slat is disposed on the upper side, a daylighting slat is disposed on the lower side, and a light shielding slat 2008 is disposed on the lower side. Is provided. Here, although the lighting system of 1st Embodiment is used as a light control blind, it is not restricted to this.

  In the room 2003, a plurality of indoor lighting devices 2007 are arranged in a grid in the left-right direction (Y direction) of the window 2002 and the depth direction (X direction) of the room. The plurality of indoor lighting devices 2007 together with the daylighting system 2010 constitute an entire lighting system of the room 2003.

As shown in FIGS. 16 and 17, for example, (the horizontal direction of the window 2002, Y-direction) width direction of the room 2003 length _{L 1} of 18m, a depth direction of the room 2003 (X direction) length _{L 2} A 9 m office ceiling 2003a is shown. Here, the indoor lighting devices 2007 are arranged in a grid pattern with an interval P of 1.8 m in the horizontal direction (Y direction) and the depth direction (X direction) of the ceiling 2003a. More specifically, 50 indoor lighting devices 2007 are arranged in 10 rows (Y direction) × 5 columns (X direction).

  The indoor lighting device 2007 includes an indoor lighting fixture 2007a, a brightness detection unit 2007b, and a control unit 2007c. The indoor lighting device 2007 has a configuration in which a brightness detection unit 2007b and a control unit 2007c are integrated with an indoor lighting fixture 2007a.

  The indoor lighting device 2007 may include a plurality of indoor lighting fixtures 2007a and a plurality of brightness detection units 2007b. However, one brightness detection unit 2007b is provided for each indoor lighting device 2007a. The brightness detection unit 2007b receives the reflected light of the irradiated surface illuminated by the indoor lighting fixture 2007a, and detects the illuminance of the irradiated surface. Here, the brightness detector 200b detects the illuminance of the desk surface 2005a of the desk 2005 placed indoors.

  The control units 2007c provided one by one in the room lighting device 2007 are connected to each other. Each indoor lighting device 2007 is configured such that the illuminance of the desk top surface 2005a detected by each brightness detecting unit 2007b becomes a constant target illuminance L0 (for example, average illuminance: 750 lx) by the control units 2007c connected to each other. Feedback control is performed to adjust the light output of the LED lamp of each indoor lighting fixture 2007a.

  FIG. 18 is a graph showing the relationship between the illuminance of light (natural light) collected indoors by the daylighting device and the illuminance (illumination system) by the indoor lighting device. In FIG. 18, the vertical axis indicates the illuminance (lx) on the desk surface, and the horizontal axis indicates the distance (m) from the window. Moreover, the broken line in a figure shows indoor target illumination intensity. (●: Illuminance by lighting device, △: Illuminance by indoor lighting device, ◇: Total illumination)

  As shown in FIG. 18, the desk surface illuminance caused by the light collected by the daylighting system 2010 is brighter in the vicinity of the window, and the effect decreases as the distance from the window increases. In a room to which the daylighting system 2010 is applied, such an illuminance distribution in the depth direction of the room is generated by natural daylighting from a window in the daytime. Therefore, the daylighting system 2010 is used in combination with an indoor lighting device 2007 that compensates for the illuminance distribution in the room.

  The indoor lighting devices 2007 installed on the indoor ceiling are controlled by dimming so that the average illuminance below each device is detected by the brightness detection unit 2007b and the desk surface illuminance of the entire room becomes a constant target illuminance L0. Lights up. Therefore, the S1 row and the S2 row installed in the vicinity of the window are hardly lit, and are lit while increasing the output toward the back side of the room, such as the S3 row, the S4 row, and the S5 row. As a result, the desk surface of the room is illuminated by both natural lighting and lighting by the indoor lighting device 2007, and is 750 lx (“JIS Z9110 Lighting General Rules), which is sufficient for the desk surface to work throughout the room. "Recommended maintenance illuminance in the office".

  As described above, by using the daylighting system 2010 and the lighting system (indoor lighting device 2007) in combination, it is possible to deliver light to the back side of the room, and the brightness of the room can be further improved. It is possible to secure the illuminance on the desk surface that is sufficient for work throughout the room. Therefore, a more stable and bright light environment can be obtained without being affected by the season or weather.

The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, the specific description of the number, shape, size, arrangement, material, and the like of each component constituting the daylighting system is not limited to that illustrated in the above embodiment, and can be changed as appropriate.

  One embodiment of the present invention can be used in a daylighting system for taking outside light such as sunlight into a room.

  1, 41, 51, 61, 71, 2010 ... Daylighting system, 2, 42, 56, 77 ... Spacer member, 3, 45 ... Daylighting member, 4 ... Lower light-shielding part, 6, 44, 55, 76 ... Upper light-shielding 7, 7a, 7b: light shielding slats, 8, 31: daylighting slats, 12: daylighting part, 48: frame (supporting part), 52: daylighting film (lighting member).

Claims (15)

A daylighting member comprising a plurality of daylighting parts having light permeability;
A spacer member provided above the daylighting member, and arranged at a position where the upper end of the daylighting member is lowered a predetermined distance from the mounting surface;
With
Each of the plurality of daylighting units includes a reflecting surface that selectively reflects light toward a higher side than a horizontal plane passing through a light incident position on the daylighting unit.   When the incident angle of light incident on the daylighting unit is in the range from 30 degrees to 60 degrees, out of all the emitted light rays from the daylighting unit, it is directed upward from the horizontal plane passing through the incident position of each ray to the daylighting unit. The daylighting system according to claim 1, wherein a ratio of an incident angle at which a ratio of light rays emitted in excess of ½ exceeds ½.   The ratio of the incident angle in which the ratio of the light beams having an emission angle of 0 degrees or more and 45 degrees or less out of the light beams emitted toward the upper side of the horizontal plane exceeds 1/2. Item 3. The daylighting system according to item 2.   The daylighting system according to claim 1, wherein the spacer member includes an upper light shielding portion.   The daylighting system according to claim 1, wherein the spacer member includes a transmission diffusion portion.   The daylighting system according to claim 5, wherein an uneven structure for diffusing the light is provided on a surface of the transmission diffusion portion.   The daylighting system according to claim 1, wherein the spacer member includes a support portion having an opening.   2. The daylighting system according to claim 1, wherein an upper end position of the daylighting member coincides with a lower end position of a region where direct light is not incident throughout the year at an installation location of the daylighting system or is lower than the lower end position.   The daylighting system according to claim 1, wherein the daylighting member is attached to a mounting surface located above the ceiling surface, and an upper end position of the daylighting member substantially coincides with a position of the ceiling surface.   The daylighting system according to claim 1, further comprising a light shielding portion provided on a plane opposite to the sun with respect to a plane including the daylighting member.   The daylighting system according to claim 10, wherein a light-shielding part at the same height as the daylighting member is excluded.   The daylighting system according to claim 1, further comprising a light shielding portion provided on a plane on the same side as the sun with respect to a plane including the daylighting member.   The daylighting system according to claim 12, wherein a light-shielding part at the same height as the daylighting member is excluded.   The daylighting system according to claim 1, further comprising a lower light-shielding portion provided below the daylighting member. The daylighting member comprises a plurality of daylighting slats,
The spacer member includes a plurality of light shielding slats,
The daylighting system according to claim 1, wherein the spacer member and the daylighting member constitute a blind.

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