JP6716733B2 - Lighting device and lighting slats - Google Patents

Description

The present invention relates to a daylighting device and a daylighting slat.
The present application claims priority based on Japanese Patent Application No. 2013-243185 filed in Japan on November 25, 2013, the contents of which are incorporated herein by reference.

For example, in an office or the like, outdoor natural light (sunlight) enters indoors (indoors) through a window glass or the like, so that people indoors may feel dazzling. For this reason, blinds and curtains are placed in front of the window glass to prevent glare during work and to block the light incident from the window glass from the viewpoint of security and privacy protection. Or prevent people from peeping into the room through window glass.

In this case, since the indoor becomes dark, most of the indoor lighting equipment has to be turned on even during the day. For this reason, it is not possible to save energy consumed by the lighting equipment, and there is a problem such as an increase in power consumption and an accompanying increase in CO ₂ emission.

On the other hand, for example, a horizontal blind having an opening means at the top has been proposed (see Patent Document 1). In the horizontal blind described in Patent Document 1, it is possible to block light by the lower blind while collecting light by the upper opening means.

JP, 2011-52377, A

By the way, the light incident from the window glass is irradiated toward the ceiling, the side wall, the floor, etc. in the room. Of these, the light that goes to the ceiling is a substitute for the illumination light because it reflects on the ceiling and illuminates the room. Therefore, such light directed to the ceiling can be expected to have an energy-saving effect of saving energy consumed by the lighting equipment during the daytime.

On the other hand, in the case of the horizontal blind having the opening means in the upper part, the light incident from the opening means in the upper part is concentrated on the front side in the room near the window glass, so that it is difficult to illuminate the back side in the room. is there. Further, since it is not possible to irradiate the light heading for the ceiling to the interior of the room, it is difficult to illuminate the room over a wide range with the light reflected by the ceiling. Therefore, in this case, most of the indoor lighting equipment cannot be turned off even during the day, and the above-described energy saving effect cannot be sufficiently obtained.

One aspect of the present invention has been proposed in view of such conventional circumstances, while efficiently incorporating the outdoor natural light (sunlight) indoors, without causing the indoor person to feel dazzling. Another object of the present invention is to provide a daylighting device capable of making a person feel deep inside a room, and a daylighting slat suitable for use in such a daylighting device.

In order to achieve the above object, the present invention adopts the following means.
(1) A daylighting device according to a first aspect of the present invention includes a plurality of slats that are arranged side by side with an interval between them, and a support mechanism that supports the plurality of slats so that they can be suspended vertically. At least a part of the plurality of slats is constituted by a daylighting slat, and the daylighting slats include a first base material having a light-transmitting property, and a plurality of light distribution slats arranged side by side on one surface of the first base material. The first base material and the light diffusion body having a pseudo stripe structure on the other surface of the first base material, and the refractive indexes of the first base material and the projection portion are substantially the same. And, the refractive index of the protrusion and the light diffuser are different, and the lighting slat emits light that is incident inside from one surface obliquely above the one surface of the lighting slat, and is output obliquely upward from the other surface to the outside. The light diffuser diffuses the light emitted from the other surface to the outside in the vertical direction and the horizontal direction, and allows the light emitted from the other surface to the outside in the horizontal direction rather than the vertical direction. It is a daylighting device having an anisotropic scattering characteristic that spreads widely.

(2) In the daylighting device according to (1), the daylighting slat has a flat plate-shaped second base member that faces the plurality of protrusions with an air layer in between, and the daylighting slat is the first light source. Light incident on the one base material from diagonally above may be refracted by the protrusion, and then may be emitted obliquely upward from the second base material to the outside.

(3) In the daylighting device according to (1) or (2), the daylighting slat has a shape bent at an intermediate portion in a cross section in a direction orthogonal to its longitudinal direction, and is formed on an upper surface. The plurality of first protrusions and the plurality of second protrusions formed on the lower surface may have different shapes.

(4) In the daylighting device according to any one of (1) to (3) above, the plurality of slats are located below a daylighting section configured by the daylighting slats, and the daylighting section, And a light-shielding portion formed of a slat having a light-shielding property, and the tilting operation of the daylighting portion and the light-shielding portion may be possible.

(5) In the daylighting device according to any one of (1) to (4), the support mechanism may support the plurality of slats so as to be vertically movable.

(6) In the daylighting device according to (4), the support mechanism may support the daylighting unit and the light shielding unit so as to be independently tiltable.

(7) A daylighting slat according to a second aspect of the present invention includes a first base material having light transmissivity, a plurality of protrusions arranged side by side on one surface of the first base material, and the first base. A light diffuser having a pseudo stripe structure on the other surface of the material, the first base material and the protrusions have substantially the same refractive index, and the first base material and the protrusions and the light diffuser. The refractive index of the body is different, and the light that is incident on the one surface of the first base material from diagonally above is emitted obliquely upward from the other surface of the first base material to the outside to diffuse the light. The body diffuses the light emitted from the other surface to the outside in the vertical direction and the horizontal direction, and spreads the light emitted from the other surface to the outside in the horizontal direction rather than the vertical direction. It is a daylighting slat having a scattering characteristic.

(8) In the daylighting slat according to (7) above, a flat plate-shaped second base material that faces the plurality of protrusions of the first base material with an air layer interposed therebetween is provided, and On the other hand, the light incident obliquely upward from the inside may be refracted by the protrusion, and then may be emitted obliquely upward from the second base material to the outside.

(9) In the daylighting slat according to (7) or (8), the first base material has a shape that is bent at an intermediate portion in a cross section in a direction orthogonal to the longitudinal direction, and has a top surface. The plurality of first protrusions formed may have a different shape from the plurality of second protrusions formed on the lower surface.

As described above, according to one aspect of the present invention, outdoor natural light (sunlight) is efficiently taken indoors, and the indoor person can be brightened without feeling glare. It is possible to provide a daylighting device that can be made to feel, and a daylighting slat suitable for use in such a daylighting device.

It is a perspective view showing appearance of a daylighting device concerning a 1st embodiment of the present invention. It is a 1st figure for demonstrating the schematic structure of the lighting slat with which the lighting device shown in FIG. 1 is equipped. It is a 2nd figure for demonstrating the schematic structure of the lighting slat with which the lighting device shown in FIG. 1 is equipped. It is the 1st perspective view which expanded the principal part of the lighting device shown in FIG. It is the 2nd perspective view which expanded the important section of the lighting device shown in Drawing 1. It is a schematic diagram which shows an example of the room model in which the daylighting device shown in FIG. 1 was installed. FIG. 3 is a perspective view for explaining the functions of a daylighting section and a light shielding section included in the daylighting device shown in FIG. 1. It is a side view for explaining the function of the lighting slat which constitutes a lighting part. It is a 1st side view for demonstrating the function of the light-shielding slat which comprises a light-shielding part. It is a 2nd side view for demonstrating the function of the light-shielding slat which comprises a light-shielding part. It is a 1st side view for demonstrating the tilting operation of a lighting slat and a light shielding slat. It is a 2nd side view for demonstrating the tilting operation of a lighting slat and a light-shielding slat. It is a 3rd side view for demonstrating the tilting operation of the lighting slat and the light-shielding slat. It is a 1st side view which shows the modification of the protrusion part with which the lighting slat is provided. It is a 2nd side view which shows the modification of the protrusion part with which a lighting slat is provided. It is a side view which shows the modification of a lighting slat. It is a side view which shows the modification of a lighting slat. It is a side view which shows the modification of a lighting slat. It is a side view which shows the modification of a lighting slat. It is a 1st side view which shows the modification of a lighting slat. It is a 2nd side view which shows the modification of a lighting slat. It is a top view which illustrates the surface shape of a light diffuser. It is a 1st schematic diagram of the room model which shows the lighting property of the lighting slat by the presence or absence of light diffusivity. It is a 2nd schematic diagram of the room model which shows the lighting property of the lighting slat by the presence or absence of light diffusivity. It is a graph which shows the light-scattering characteristic of a light diffuser. It is a 1st schematic diagram of the room model for demonstrating the light-diffusion characteristic of the lighting slat. It is a 2nd schematic diagram of the room model for demonstrating the light-diffusion characteristic of the lighting slat. It is a 1st figure which shows an example of the lighting slat which has an anisotropic scattering characteristic. It is a 2nd figure which shows an example of the lighting slat which has an anisotropic scattering characteristic. It is a 3rd figure which shows an example of the lighting slat which has an anisotropic scattering characteristic. It is a graph which shows the light-scattering characteristic of the light diffuser with which the lighting slat shown to FIG. 19A-FIG. 19C is equipped. It is a side view which shows schematic structure of the lighting slat with which the lighting device which concerns on the 2nd Embodiment of this invention is equipped. It is a 1st schematic diagram which shows the room model in which the lighting device in an Example was installed. It is a 2nd schematic diagram which shows the room model in which the daylighting apparatus in an Example was installed. It is the photograph which image|photographed the light which goes to the ceiling at the time of installing a lighting device in front of a window glass. It is the photograph which image|photographed the light which goes to the ceiling at the time of installing the lighting device with which the light-diffusing property was provided in the front surface of the window glass. It is the photograph which image|photographed the light which goes to the ceiling when a shading blind is installed. It is a figure which shows the room model 2000 provided with the lighting device and the illumination dimming system. FIG. 6 is a plan view showing a ceiling of a room model 2000. It is a graph which shows the relationship between the illuminance of the light (natural light) which the daylighting device lighted in the room, and the illuminance (illumination dimming system) by an indoor lighting device.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
In addition, in all the following drawings, in order to make each component easy to see, the scale of dimensions may be different for each component.

[First Embodiment]
First, as a first embodiment of the present invention, for example, a daylighting device 1 shown in FIG. 1 will be described. Note that FIG. 1 is a perspective view showing an appearance of the daylighting device 1. In the following description, the positional relationship (upper, lower, left, right, front and rear) of the lighting device 1 is based on the positional relationship (up, down, left, right, front and back) when the lighting device 1 is used, and unless otherwise specified. Also in the drawings, the positional relationship of the lighting device 1 is assumed to match the positional relationship with respect to the paper surface.

As shown in FIG. 1, the daylighting device 1 includes a plurality of slats 2 arranged in parallel in a horizontal direction at intervals, and a support mechanism 3 for supporting the plurality of slats 2 so as to be suspended vertically. There is. Further, in the daylighting device 1, the plurality of slats 2 are supported so as to be vertically movable and the plurality of slats 2 are also supported so as to be tiltable.

The plurality of slats 2 include a daylighting section 5 configured by a plurality of daylighting slats 4 having a daylighting property, and a light blocking section 7 located below the daylighting section 5 and configured by a plurality of light blocking slats 6 having a light blocking property. And have. In the following description, the daylighting slats 4 and the light-shielding slats 6 will be collectively treated as the slats 2 unless otherwise specified.

As shown in FIGS. 2A and 2B, the lighting slat 4 forming the lighting unit 5 includes a light-transmissive long plate-shaped base material 8 and a plurality of protrusions formed side by side on one surface of the base material 8. And part 9. Note that FIG. 2A is a perspective view showing a schematic configuration of the lighting slat 4. FIG. 2B is a sectional view taken along line X-X′ of the daylighting slat 4 shown in FIG. 2A. However, regarding the lighting slat 4 shown in FIG. 2A and FIG. 2B, the illustration of the configuration other than the base material 8 and the protruding portion 9 is omitted, and the shape thereof is also simplified.

The base material 8 is made of a light transmissive resin such as a thermoplastic polymer, a thermosetting resin, or a photopolymerizable resin. As the light-transmitting resin, one made of acrylic polymer, olefin polymer, vinyl polymer, cellulose polymer, amide polymer, fluorine polymer, urethane polymer, silicone polymer, imide polymer, etc. is used. be able to. Among them, for example, polymethyl methacrylate resin (PMMA), triacetyl cellulose (TAC), polyethylene terephthalate (PET), cycloolefin polymer (COP), polycarbonate (PC), polyethylene naphthalate (PEN), polyether sulfone (PES), polyimide (PI), etc. can be used suitably. The total light transmittance of the base material 2 is preferably 90% or more according to JIS K7361-1. Thereby, sufficient transparency can be obtained.

The protrusion 9 is made of, for example, an organic material having light transparency and photosensitivity such as acrylic resin, epoxy resin, or silicone resin. In addition, a mixture of these organic materials with a polymerization initiator, a coupling agent, a monomer, an organic solvent and the like can be used. Furthermore, the polymerization initiator contains various additive components such as a stabilizer, an inhibitor, a plasticizer, an optical brightener, a release agent, a chain transfer agent, and other photopolymerizable monomers. Good. In addition, the materials described in Japanese Patent No. 4129991 can be used. The total light transmittance of the protrusions 9 is preferably 90% or more according to JIS K7361-1. Thereby, sufficient transparency can be obtained.

The plurality of protrusions 9 extend in the longitudinal direction (length direction) of the base material 8 and are arranged side by side in the lateral direction (width direction) of the base material 8. In addition, each protrusion 9 constitutes a prism body having a triangular cross section. Specifically, the protruding portion 9 includes a first surface portion 9a facing one surface of the base material 8, a second surface portion 9b adjacent to the first surface portion 9a and a first corner portion 10a, and a second surface portion 9b. A third surface portion 9c that is adjacent to the first surface portion 9a with the second corner portion 10b opposite to the first corner portion 10a and a second surface portion 9b that is adjacent to the second surface portion 9b with the third corner portion 10c interposed therebetween. And have.

Here, since air exists between each of the plurality of protrusions 9, the space between them becomes an interface with the air. In the meantime, another low refractive index material may be filled. However, the refractive index difference at the interface between the inside and the outside of the protrusion 9 is greatest when air is present than when any low refractive index material is present externally. Therefore, when air is present, the critical angle of the light that is totally reflected by the second surface portion 9b or the third surface portion 9c among the light incident on the protrusion 9 is the smallest, according to Snell's law. .. As a result, the range of the incident angle of the light totally reflected by the second surface portion 9b or the third surface portion 9c becomes the widest, so that the light incident on the protruding portion 9 is efficiently transmitted to the other surface side of the base material 8. I can guide you well. As a result, the loss of light incident on the protrusion 9 can be suppressed, and the brightness of light emitted from the other surface of the base material 8 can be increased.

In addition, it is desirable that the refractive index of the base material 8 and the refractive index of the protrusion 9 are substantially equal. The reason is that, for example, when the refractive index of the base material 8 and the refractive index of the projection portion 9 are significantly different, when light enters the base material 8 from the projection portion 9, the projection portion 9 and the base material 8 are separated from each other. Undesirable refraction or reflection of light may occur at the interface. This is because, in this case, there is a possibility that a desired lighting property may not be obtained and that the brightness may be lowered.

As a method of manufacturing the daylighting slat 4, for example, a plurality of protrusions 9 can be formed on the base material 8 by using a photolithography technique. In addition to the method using the photolithography technique, the daylighting slat 4 can be manufactured by a method such as a melt extrusion method, a die extrusion method, or an imprint method. In a method such as a melt extrusion method or a die extrusion method, the base material 8 and the protrusions 9 are integrally formed of the same resin.

As shown in FIG. 1, the light-shielding slats 6 constituting the light-shielding portion 7 are made of a long plate-shaped substrate 11 having a light-shielding property. The base material 11 may be one that is generally used as a so-called blind slat, and examples thereof include those made of metal, wood, and resin. Moreover, the thing which painted the surface of the base material 11 can be mentioned.

The support mechanism 3 includes a plurality of ladder cords 12 arranged in parallel in the vertical direction (shorter direction of the plurality of slats 2 ), a fixed box 13 that supports upper end portions of the plurality of ladder cords 12, and a plurality of ladder cords 12. And a lifting bar 14 attached to the lower end.

A pair of ladder cords 12 are arranged side by side on the left and right sides sandwiching the central portion of the plurality of slats 2. As shown in FIGS. 3A and 3B, each ladder cord 12 includes a pair of front and rear vertical cords 15a and 15b arranged in parallel with each other, and a pair of upper and lower horizontal cords 16a and 16b that are laid between the vertical cords 15a and 15b. And the horizontal cords 16a and 16b are arranged at equal intervals in the longitudinal direction (vertical direction) of the vertical cords 15a and 15b. Each slat 2 is arranged in a state of being inserted between each of the vertical cords 15a and 15b and the horizontal cords 16a and 16b. 3A and 3B are enlarged perspective views of a main part of the daylighting device 1, FIG. 3A shows a state in which each slat 2 is opened, and FIG. 3B shows each slat 2 in a closed state. Shows the state of

As shown in FIG. 1, the fixed box 13 is located at the uppermost portion of the plurality of slats 2 arranged in parallel with each other, and is arranged in parallel with the plurality of slats 2. On the other hand, the elevating bar 14 is located at the bottom of the plurality of slats 2 arranged in parallel with each other, and is arranged in parallel with the plurality of slats 2. The vertical cords 15a and 15b forming each ladder cord 12 are suspended from the fixed box 15 while being pulled vertically downward by the weight of the elevating bar 16.

The support mechanism 3 includes an elevating/lowering operation unit 17 for vertically moving the plurality of slats 2 and a tilting operation unit 18 for tilting the plurality of slats 2.

The lifting operation unit 17 has a plurality of lifting cords 19 as shown in FIGS. 1 and 3A and 3B. The plurality of lifting cords 19 are arranged in parallel with the vertical cords 15a and 15b forming the ladder cord 12, respectively. The lower ends of the plurality of lifting cords 19 are attached to the lifting bar 14 while penetrating through the holes 20 formed in each slat 2.

The upper and lower ends of the plurality of lifting cords 19 are routed inside the fixed box 13 and pulled out from a window 21 provided on one side of the fixed box 13. The lifting cord 19 pulled out from the window portion 21 is connected to one end of the operation cord 22. The other end of the operation cord 22 is attached to one end of the elevating bar 14.

In the elevating operation part 17, the elevating cord 19 is pulled inside the fixed box 13 by pulling the operation cord 22 from the state where the elevating bar 14 is located at the lowermost portion. As a result, the plurality of slats 2 ascend along with the elevating bar 14 while sequentially overlapping the elevating bar 14 from the lower side. The lifting cord 19 is fixed by a stopper (not shown) provided inside the window 21. Thereby, the elevating bar 14 can be fixed at an arbitrary height position. On the contrary, by releasing the fixing of the lifting cord 19 by the stopper, the lifting bar 14 can be lowered by its own weight. As a result, the elevating bar 14 can be positioned again at the bottom.

As shown in FIG. 1, the tilting operation portion 18 has an operation lever 23 on one side of the fixed box 15. The operation lever 23 is attached so as to be rotatable around its axis. In the tilting operation section 18, the vertical cords 15a and 15b forming the ladder cord 12 can be vertically moved in opposite directions by rotating the operation lever 23 around the axis. As a result, the plurality of slats 2 can be tilted in synchronization with each other between the state in which the spaces between the slats 2 shown in FIG. 3A are opened and the state in which the spaces between the slats 2 shown in FIG. 3B are closed. ..

The daylighting device 1 having the above-described configuration is arranged in a state of being suspended from the upper portion of a window glass or the like, with a plurality of slats 2 facing the inner surface of the window glass. Further, the daylighting section 5 is arranged such that the surface of each daylighting slat 4 on which the projection 9 is formed faces the window glass.

Here, the functions of the daylighting unit 5 and the light shielding unit 7 of the daylighting device 1 will be described using the room model 1000 shown in FIG. 4 is a schematic diagram showing an example of a room model 1000 in which the daylighting device 1 is installed.

The room model 1000 is a model that is assumed to be used in the office of the daylighting device 1, for example. Specifically, the room model 1000 shown in FIG. 4 is a room surrounded by a ceiling 1001, a floor 1002, a front side wall 1004 to which a window glass 1003 is attached, and a back side wall 1005 facing the front side wall 1004. In 1006, the case where the outdoor light L is incident from diagonally above through the window glass 1003 is simulated. The daylighting device 1 is arranged so as to face the inner surface of the window glass 1003.

In the room model 1000, the height dimension (dimension from the ceiling 1001 to the floor 1002) H1 of the room 1006 is 2.7 m, the vertical dimension H2 of the window glass 1003 is 1.8 m from the ceiling 1001, and the vertical dimension of the lighting unit 5 is. H3 is set to 0.6 m from the ceiling 1001 and the depth dimension (dimension from the front side wall 1004 to the back side wall 1005) W of the room 1006 is set to 16 m.

In the room model 1000, there is a person Ma who sits in a chair inside the room 1006 and a person Mb who stands on the floor 1002 toward the back of the room 1006. The eye height Ha of the person Ma sitting on the chair is 0.8 m from the floor 1002, and the eye height Hb of the person Mb standing on the floor 1002 is 1.8 m from the floor 1002.

An area G in which the persons Ma and Mb in the room 1006 feel glare (hereinafter, referred to as a glare area) G is a range of eye heights Ha and Hb of the persons Ma and Mb in the room. In addition, the vicinity of the window glass 1003 in the room 1006 is a region F in which the outdoor light L is directly irradiated mainly through the window glass 1003. This region F is set within a range of 1 m from the front side wall 1004. Therefore, the glare region G is a range from a position 1 m away from the front side wall 1004 excluding the region F to a back side wall 1005 in the height range of 0.8 m to 1.8 m from the floor 1002. ..

In the lighting unit 5, as shown in FIGS. 4 and 5, the light L that has entered the inside of the lighting slat 4 from diagonally above is directed obliquely upward from the other surface of each lighting slat 4 to the outside. And emit. Specifically, in each lighting slat 4, as shown in FIG. 6, the light L incident on each protrusion 9 from the second surface 9b is totally reflected by the third surface 9c, and then the light L traveling toward the ceiling 1001. Is emitted from the other surface of the base material 8.

As a result, as shown in FIG. 4, of the light L incident on the room 1006 through the window glass 1003, the brightness of the light heading for the ceiling 1001 is reduced while reducing the brightness of the light heading for the glare region G and the light heading for the floor 1002. Can be relatively increased. That is, the light L that has entered the room 1006 through the window glass 1003 can be efficiently emitted toward the ceiling 1001. In addition, the light L toward the ceiling 1001 can be emitted to the back of the room 1006 without causing the persons Ma and Mb in the room 1006 to feel glare.

Further, the light L'reflected on the ceiling 1001 illuminates the room 1006 brightly over a wide range as a substitute for the illumination light. In this case, by turning off the lighting equipment in the room 1006, an energy-saving effect of saving energy consumed by the lighting equipment in the room 1006 during the day can be expected.

On the other hand, in the light-shielding portion 7, as shown in FIGS. 4 and 5, the light L that is incident on the inside of the light-shielding slats 6 obliquely from above is shielded by the light-shielding slats 6. Since the light-shielding portion 7 is located below the daylighting portion 5, it is possible to shield the light mainly entering the glare area G and the light traveling toward the floor 1002 out of the light L entering the room 1006 through the window glass 1003. Is.

In addition, in the daylighting device 1, the angle of the light L directed to the ceiling can be adjusted in the daylighting section 5 by tilting the plurality of slats 2. On the other hand, in the light shielding part 7, as shown in FIGS. 7A and 7B, by tilting the plurality of slats 2, the light L incident from between the respective light shielding slats 6 is adjusted, and each of the light shielding slats 6 is adjusted. You can see the outside through the window glass 1003. Note that FIG. 7A shows a state where the light shielding slats 6 are closed, and FIG. 7B shows a state where the light shielding slats 6 are opened.

Further, in the daylighting device 1, by operating the plurality of slats 2 up and down, for example, when the elevating bar 14 is located at the boundary between the daylighting part 5 and the light shielding part 7, it faces the light shielding part 7 of the window glass 1003. The area can be left open. Furthermore, when the elevating bar 14 is located at the top, the entire surface of the window glass 1003 can be opened.

As described above, when the daylighting device 1 of the present embodiment is used, the light L incident on the room 1006 through the window glass 1003 is directed to the ceiling 1001 of the room 1006 by the plurality of daylighting slats 4 constituting the daylighting unit 5. The light L directed toward the glare region G can be shielded by the plurality of light-shielding slats 6 that form the light-shielding portion 7.

Therefore, according to the daylighting device 1, the outdoor natural light (sunlight) is efficiently introduced into the room 1006 through the daylighting section 5, and the people Ma and Mb in the room 1006 do not feel glare. It is possible to make the interior feel bright. On the other hand, it is possible to block the light incident from the window glass 1003 by the light shielding unit 7 and prevent the room 1006 from being seen through the window glass 1003.

It should be noted that the present invention is not necessarily limited to the configuration of the daylighting device 1 shown as the first embodiment, and various modifications can be made without departing from the spirit of the present invention.

For example, the number, size, and the like of the slats 2 can be appropriately changed according to the size of the window glass 1003. In accordance with this, since the plurality of slats 2 are supported in parallel with each other with respect to the ladder cord 12, it is possible to increase the number to be arranged.

In addition, in the above-mentioned daylighting device 1, among the plurality of slats 2, the plurality of daylighting slats 4 that form the daylighting section 5 are arranged on the upper side, and the plurality of light-shielding slats 6 that form the light-shielding section 7 are arranged on the lower side. However, the configuration is not necessarily limited to such a configuration, and at least a part of the plurality of slats 2 may be configured by the lighting slat 4.

Further, although the supporting mechanism 3 is configured to manually operate the elevating operation unit 17 and the tilting operation unit 18 described above, the elevating operation of the plurality of slats 2 can be performed by using a driving unit such as a drive motor. The tilting operation of the plurality of slats 2 may be automatically operated.

Further, in the support mechanism 3, as shown in, for example, FIG. 8A to FIG. 8C, the plurality of daylighting slats 4 forming the daylighting section 5 and the plurality of daylighting slats 6 forming the light shielding section 7 are independently tilted. It may be configured to operate.

Specifically, as shown in FIG. 8A, when the altitude of the sun is relatively high, the light L incident on the room 1006 through the window glass 1003 is collected by closing the daylighting unit 5 and the light shielding unit 7. The ceiling 1001 of the room 1006 is illuminated by the plurality of daylighting slats 4 forming the part 5, and the light L directed to the glare region G is shielded by the plurality of light shielding slats 6 forming the light shielding part 7.

On the other hand, when the altitude of the sun shown in FIG. 8B is relatively low, the angle of each daylighting slat 4 is adjusted by rotating only the plurality of daylighting slats 4 composing the daylighting section 5 accordingly. .. As a result, as in the case shown in FIG. 8A, the light L that has entered the room 1006 through the window glass 1003 can be emitted toward the ceiling 1001 of the room 1006 by the plurality of daylighting slats 4 that form the daylighting unit 5.

Further, as shown in FIG. 8C, by rotating only the plurality of light-shielding slats 6 constituting the light-shielding portion 7, the light-shielding portion 7 can be opened while the light-collecting portion 5 is closed. As a result, the light L that has entered the room 1006 through the window glass 1003 is emitted toward the ceiling 1001 of the room 1006 by the plurality of daylighting slats 4 that form the daylighting section 5, and the plurality of light-shielding slats 6 that form the light-shielding section 7 are provided. The outside can be seen through the window glass 1003 from between.

Further, the projection 9 is not limited to the prism having the triangular cross-section described above, and may be a prism having a right-angled triangular cross-section, for example, the projection 9A shown in FIG. 9A. Alternatively, as in the case of the protrusion 9B shown in FIG. 9B, the prism may have a trapezoidal (rectangular) cross-section, and the cross-sectional shape can be appropriately changed.

In the lighting device 1, instead of the lighting slat 4, a lighting slat 4A having a bent shape as shown in, for example, FIG. 10 in a cross section in a direction orthogonal to the longitudinal direction thereof, or as shown in FIG. A configuration using the lighting slat 4B having a curved shape may be used.

Specifically, in the bent lighting slat 4A shown in FIG. 10, the first protrusion 91 formed on the one (upper) side surface of the base material 8 bent in the middle portion and the other (lower) portion The shapes of the second protrusions 92 formed on the side surface are different from each other. The 1st protrusion part 91 is comprised by the prism body of the angle which the light which injected into this lighting slat 4A is emitted toward the ceiling 1001 of the room 1006, when the altitude of the sun is comparatively low. On the other hand, the second protrusion 92 is formed of a prism body having an angle that allows the light incident on the lighting slat 4A to be emitted toward the ceiling 1001 of the room 1006 when the altitude of the sun is relatively high.

In the case of this configuration, the light incident on the first protrusion 91 and the second protrusion 92 is irradiated toward the ceiling 1001 of the room 1006 in accordance with the difference in the angle of the light L incident on the lighting slat 4A. Therefore, it is possible to suppress the fluctuation of the irradiation position of the room 1006 due to the change of the altitude of the sun.

Further, the curved lighting slat 4B shown in FIG. 11 can also obtain the same effect as the curved lighting slat 4A shown in FIG. Further, since the lighting slat 4B has a curved shape, the angle at which the light incident on the lighting slat 4B is emitted toward the ceiling 1001 of the room 1006 can be continuously changed.

Further, the plurality of slats 2 have a bent or curved shape in a cross section in a direction orthogonal to the longitudinal direction thereof, so that the rigidity thereof can be increased.

Further, in the daylighting device 1, instead of the daylighting slat 4, a daylighting slat 4C as shown in FIG. 12 may be used. This lighting slat 4C includes one base material 8A having a light-transmitting property, a plurality of projecting portions 9 formed side by side on one surface of the one base material 8A, and facing each other with the plurality of projecting portions 9 sandwiching an air layer. And the other base material 8B. That is, the lighting slat 4C has a structure in which the base material 8B is further added to the structure of the lighting slat 4 described above.

The base materials 8A and 8B can be made of the same material as the base material 8. As a method for manufacturing the lighting slat 4C, for example, a plurality of protrusions 9 are formed on one base material 8A by using a photolithography technique, and then the other base material 8B is opposed to the protrusion portion 9. It can be produced by laminating one base material 8A in this state. In addition to the method using the photolithography technique, the daylighting slat 4C can be manufactured by a method such as a melt extrusion method, a die extrusion method, or an imprint method. In a method such as a melt extrusion method or a die extrusion method, the base materials 8A and 8B and the protruding portion 9 are integrally formed of the same resin.

In the case of this configuration, the inner surface of the window glass 1003 is arranged such that the surface of the daylighting slat 4C opposite to the surface on which the projection 9 is formed faces. That is, in this daylighting slat 4C, the light L that has entered the inside of the one base material 8A from diagonally above is refracted by the protrusions 9 and then obliquely upward from the other base material 8B to the outside. Emit.

As a result, the same effect as in the case of using the daylighting slats 4 can be obtained. That is, the light L that has entered the room 1006 through the window glass 1003 can be efficiently emitted toward the ceiling 1001 of the room 1006 by the lighting slat 4C. In addition, the light L toward the ceiling 1001 can be emitted to the back of the room 1006 without causing the persons Ma and Mb in the room 1006 to feel glare. In addition, in the lighting slat 4, by disposing the plurality of protrusions 9 between the one base material 8A and the other base material 8B, the plurality of protrusions 9 are protected and the protrusions 9 are prevented from becoming dirty. It is possible to prevent.

Further, as in the lighting slat 4D shown in FIG. 13, a configuration may be adopted in which the light diffuser 30 that diffuses the light L emitted from the other surface of the base material 8 to the outside is provided. In this case, the lights L traveling toward the ceiling 1001 from the respective lighting flats 4D forming the daylighting section 5 are diffused, so that more uniform light L can be emitted toward the ceiling 1001.

As the light diffuser 30, for example, a light diffuser layer in which spherical fine particles of about several hundreds to several tens μm are dispersed in a resin is formed on the other surface of the substrate 8. The fine particles are made of a material having a refractive index different from that of the surrounding resin. Thereby, the light can be diffused by the refraction action at the interface between the fine particles and the resin. Examples of the material of the fine particles include those made of an inorganic material such as silica (silicon oxide, n (refractive index)=1.46), (meth)acrylic acid ester (n=1.49 to 1.57), styrene. It is possible to use, for example, an organic material obtained by polymerizing a monomer centered on (n=1.6).

In addition, as in the lighting slat 4E shown in FIGS. 14A and 14B, the liquid having the fine particles 31 dispersed is applied to the other surface of the base material 8 and dried, so that the unevenness of the fine particles 31 is formed on the surface. It may be the diffusion film 32. As a result, a light diffusion effect that light is scattered in a complicated manner can be exhibited. Note that FIG. 14A is a perspective view showing a schematic configuration of the lighting slat 4E. FIG. 14B is a Y-Y′ cross-sectional view of the daylighting slats 4E shown in FIG. 14A.

Further, the light diffuser is not limited to the above-described one, but may be one having the surface shape shown in FIG.

Here, the lighting characteristics when the light diffusing property is imparted to the lighting slat and when the light diffusing property is not imparted to the lighting slat will be described with reference to FIGS. 16A and 16B. Note that FIG. 16A is a schematic diagram of the room model 1000 showing the lighting characteristics when light diffusivity is imparted to the lighting slats. FIG. 16B is a schematic diagram of the room model 1000 showing the lighting characteristics when the lighting slats are provided with the light diffusion property.

As shown in FIG. 16A, when the daylighting slats are not provided with the light diffusion property, the light L from the daylighting slats is radiated straight toward the ceiling. Therefore, when natural light (sunlight) outdoors shines directly on the daylighting slat 4 as in a sunny day, for example, the light L directed toward the ceiling is reflected by the daylighting slat 4 by reflecting the refracted sunlight. The person M may directly look (depending on the installation height of the lighting slat 4 and the position of the sun). In this case, such light is perceived as glare and unpleasant glare.

Sunlight can be regarded as a point light source with extremely high brightness and directivity. For this reason, when the light L enters straight, the light L enters the room 1006 while maintaining the characteristics of high brightness and high directivity. If this happens to be in the eyes of M alone, it will feel very dazzling.

On the other hand, as shown in FIG. 16B, when the lighting slat 4 is provided with the light diffusion property, the above-mentioned glare can be prevented from occurring. That is, the outside light including the sunlight incident from the outside is diffused by the daylighting slats 4 to which the light diffusing property is applied, and converted into so-called soft light L. As a result, the luminance in the specific direction is reduced, and glare is less likely to occur.

Further, when the lighting slats 4 are provided with the light diffusion property, the amount of the light L reaching the interior of the room is relatively small, but there is an advantage that the light L can be spread in the lateral direction. By spreading the light L in the lateral direction, it is possible to brighten the entire room (in the lateral direction) from end to end even if the window glass is small. Further, there is an advantage that the center part of the room can be brightened even if the sun is inserted obliquely.

Next, the light diffusion characteristics of the daylighting slats will be described with reference to FIGS. 17 and 18A and 18B. Note that FIG. 17 is a graph showing the light scattering characteristics of the light diffuser. Specifically, FIG. 17 is a graph in which the peak value is standardized with the peak value as 1 with respect to the light intensity which is obtained by irradiating the light diffuser with the measurement light from the vertical direction and moving the light receiver on the opposite side in the polar angle direction. Is. FIG. 18A is a plan view of the room model 1000 for explaining the light diffusion characteristics of the daylighting slats 4. FIG. 18B is a side view of the room model 1000 for explaining the light diffusion characteristics of the daylighting slats 4.

As shown in FIG. 17, as the light diffuser, it is preferable to use one having a weak scattering property with a full width of several degrees to about 20 degrees so that the directivity of the light toward the ceiling is not significantly reduced.

Further, as shown in FIGS. 18A and 18B, the lighting slat 4 preferably has a light-scattering property that spreads light in the horizontal direction and does not spread light in the vertical direction very much. That is, when the light spreads in the vertical direction, the light heading for the ceiling is diffused in the direction of the person on the floor, and the brightness seen by the person becomes higher than that when the directivity is high.

Specifically, FIGS. 19A to 19C show an example of daylighting slats 4F having anisotropic scattering characteristics. Note that FIG. 19A is a perspective view showing a schematic configuration of the lighting slat 4F. FIG. 14B is a ZZ′ sectional view of the daylighting slat 4F shown in FIG. 19A.
FIG. 19C is a perspective view showing the in-plane structure of the light diffuser 33 included in the daylighting slat 4F shown in FIG. 19A.

As shown in FIGS. 19A to 19C, the lighting slat 4F has a configuration in which the light diffuser 33 is provided on the other surface of the base material 8 in addition to the plurality of protrusions 9 provided on the one surface of the base material 8. Have
The light diffuser 33 has a so-called pseudo-stripe structure in which stripe-shaped protrusions 33 a extending substantially in the lateral direction (width direction) are arranged in the longitudinal direction (length direction) of the base material 8. The daylighting slats 4F are provided with anisotropic scattering characteristics due to this pseudo stripe structure.

Here, a graph showing the light scattering characteristics of the light diffuser 33 is shown in FIG. In addition, the solid line shown in FIG. 20 shows the graph which measured the light intensity in the horizontal direction (0°-180°). The broken line shown in FIG. 20 shows the graph which measured the light intensity in the vertical direction (90°-270°). The full width at half maximum of the light diffuser 33 in the horizontal direction is about 32°, and the full width at half maximum in the vertical direction of the light diffuser 33 is about 5°.

In the lighting slat 4F, by disposing such a light diffuser 33 on the other surface of the base material 2, an ideal anisotropic shape in which diffused light spreads in the horizontal direction and diffused light does not spread much in the vertical direction. It is possible to obtain a characteristic scattering characteristic.

[Second Embodiment]
Next, as a second embodiment of the present invention, a daylighting device 50 including the daylighting slats 40 shown in FIG. 21, for example, will be described. 21. FIG. 21 is a cross-sectional view showing a schematic configuration of the lighting slat 40.

The daylighting device 50 has the same configuration as the daylighting device 1 except that the daylighting slat 40 is provided instead of the daylighting slat 4. Therefore, in the following description, the configuration of the lighting slat 40 will be described.

The daylighting slat 40 includes a first base material 41 and a second base material 42, which have optical transparency, arranged to face each other with an air layer in between, and the first base material 41 and the second base material. The surfaces 41 b and 42 a facing 42 are parallel to each other, and the surfaces 41 b and 42 a facing each other are inclined with respect to the normal line H of the one surface 41 a of the first base material 41. For example, in the present embodiment, the angle α formed by the facing surfaces 41b and 42a with respect to the normal line H of the one surface 41a of the first base material 41 is inclined at 83°.

In the lighting slat 40, the incident angle β of the light L1 that enters the one surface 41a of the first base material 41 obliquely from above is a constant angle with respect to the normal line H of the one surface 41a of the first base material 41. When it is above (for example, 60° or more), the light L1 is incident from one surface 41a of the first base material 41 and then totally reflected on the other surface 41b of the first base material 41, so that the first base material The light is emitted from the one surface 41 a of 41 to the outside.

On the other hand, the incident angle β of the light L2 that enters the one surface 41a of the first base material 41 obliquely from above is less than a certain angle with respect to the normal line H of the one surface 41a of the first base material 41 (for example, When the light L2 is less than 60°), the light L2 is incident from the one surface 41a of the first base material 41, then transmitted through the other surface 41b of the first base material 41, and further, of the second base material 42. After entering the one surface 42a, the light is emitted from the other surface 42b of the second base material 42 to the outside.

Therefore, in the daylighting device 50 including the daylighting slats 40, the light L1 incident on the room 1006 through the window glass 1003 can be blocked by the daylighting slats 40 when the altitude of the sun is relatively high. On the other hand, when the altitude of the sun is relatively low, the light L2 incident on the room 1006 through the window glass 1003 can be collected from the lighting slat 40.
As a result, it is possible to block outdoor natural light (sunlight) in the summer and to take outdoor natural light (sunlight) indoors in the winter.

Hereinafter, the effects of the present invention will be made more apparent by examples. The present invention is not limited to the following examples, and can be implemented with appropriate changes without departing from the scope of the invention.

In this example, first, the lighting characteristics when the lighting device 1 was actually installed on the front surface of the window glass were evaluated. 22A and 22B are schematic diagrams showing a room model in which the daylighting device 1 according to the present embodiment is installed, FIG. 22A is a schematic side view thereof, and FIG. 22B is a schematic plan view thereof. The numbers shown in FIGS. 22A and 22B indicate the measurement positions by the illuminometer.

The size of the room is 6.4 m wide, 9 m deep and 2.7 m high. The window glass 1003 of the room faces south-southwest, and sunlight is shining when the sun is in front of the noon on a sunny day in mid-September. Further, the daylighting device 1 is installed on the right side window glass 1003, and the light shielding blind S is installed on the left side window glass 1003 for comparison. The daylighting device 1 includes a daylighting part 5 in which the daylighting slats 4 are arranged side by side and a light-shielding part 7 in which a light-shielding slat 6 is arranged side by side at a position where the height from the floor is 2 m. ing. The width of the lighting device 1 is 4 m, and the height of the lighting unit 5 is 0.7 m.

Regarding the lighting slat 4, a UV-curable resin layer having a thickness of about 300 μm is formed on one surface of the base material 8 made of PET resin, and a protrusion 9 having a thickness of about several tens of μm is formed. The lighting slat 4 is arranged with the surface on which the protrusion 9 is formed facing the window side.

FIG. 23 is a photograph of light directed to the ceiling when the daylighting device 1 is installed on the front surface of the window glass. As shown in FIG. 23, on the side where the daylighting device 1 on the right side of the photograph is set, the light from the daylighting section 5 is emitted toward the ceiling. Also, it can be seen that the light heading to the ceiling is emitted to the inner part of the room. On the other hand, it can be seen that the room on the left side of the photo on which the light-shielding blind is installed is darkened because the light-shielding slats shield the light.

In this way, there is a clear difference in the brightness of the room between the side on which the lighting device 1 is installed (on the right side of the photo) and the side on which the light-shielding blind is installed (on the left side of the photo), and the ceiling is illuminated brightly on the right side of the room. The illuminance in the room is also high.

When the illuminance on the right side of the room at this time was measured, the illuminance at the ceiling (height 2.7 m) at a position 4.5 m deep inside the room was 1300 lx, and the work surface illuminance at a height of 1 m was 1000 lx. It was The south-central altitude of the sun at this time was 57°, and it is probable that the sun was located at the same altitude at the time of shooting. At this time, the illuminometer installed on the window glass showed 60000 lx.

In addition, according to the illuminance standard based on the illumination standard general rule of "JIS Z9110 2011," the lower limit value of the illuminance that should be maintained indoors is 500 lx when working with a personal computer such as a VDT. Therefore, it can be seen that sufficient illuminance is obtained when using the daylighting device 1.

Further, the depth of the room where the main measurement was performed was 9 m, but when the work surface illuminance was measured at a depth of 9 m on the right side of the room at approximately the same time, it was 700 lx. For this reason, on the right side of the room, sufficient brightness was ensured for the work to be performed by the personal computer to the inside of the room without turning on the lighting fixture, and the work could be performed comfortably.

Further, since the light from the lighting unit 5 illuminates the ceiling preferentially, the ceiling space becomes bright, and the atmosphere of the whole room is bright and a feeling of openness is felt. On the other hand, since the light-shielding portion 7 is provided below the daylighting portion 5, it was possible to work comfortably without feeling dazzling during the work. In addition, since the lighting equipment in the room was not turned on at this time, the energy used for the lighting equipment and the electricity bill were zero.

As a comparison, when the light-shielding blinds were set over the entire surface of the window glass and all the light-shielding blinds were closed, the illuminance in the room was measured on a day with the same weather as the previous time. The work surface illuminance at the depth of 9 m was less than 100 lx in all cases. For this reason, when the lighting equipment is not lit, the interior of the room is dark and it is not possible to comfortably work with the personal computer.

Next, the lighting characteristics when the lighting slat 4 included in the lighting device 1 was replaced with the lighting slat 4D were evaluated. FIG. 24 is a photograph of light directed to the ceiling when a daylighting device using daylighting slats 4D is installed on the front surface of the window glass.

In the photograph shown in FIG. 24, a lighting device using a lighting slat 4D is installed in the right window, and a light shielding blind is installed in the left window for comparison. Other than that, although the shooting date was different from that shown in FIG. 23, shooting was performed in the same room at the same time and at the same time.

Regarding the daylighting slats 4D, a light diffusing film is arranged on the other surface of the daylighting slats 4 to impart light diffusing properties.

As shown in FIG. 24, on the side where the daylighting device using the daylighting slats 4D on the right side of the photograph is set, the light from the daylighting section 5 is emitted toward the ceiling. Also, it can be seen that the light heading to the ceiling is emitted to the inner part of the room. Further, since the light traveling from the lighting flat 4D to the ceiling is diffused, the ceiling is illuminated more uniformly and the shadow is not visible.

When the illuminance on the right side of the room at this time was measured, the illuminance at the ceiling (height 2.7 m) at a position 4.5 m deep inside the room was 900 lx, and the work surface illuminance at a height of 1 m was 800 lx. It was

On the other hand, it can be seen that the room on the left side of the photo on which the light-shielding blind is installed is darkened because the light-shielding slats shield the light.

As a comparative example, FIG. 25 is a photograph of light directed to the ceiling when a light-shielding blind is installed. In the photograph shown in FIG. 25, the right side shows a light blocking state in which the light blocking slats of the light blocking blind are closed, and the left side shows a daylighting state in which the light blocking slats of the light blocking blind are opened. Other than that, although the shooting date was different from the case shown in FIG. 17, shooting was performed in the same room at the same time at the same time.

As shown in FIG. 25, it can be seen that even on the side where the light-shielding blind is opened (on the left side of the photograph), the bright region is limited to a narrow range near the window glass.

When the illuminance on the right side of the room at this time was measured, the illuminance at the ceiling (height 2.7 m) at a position 4.5 m deep inside the room was 300 lx, and the work surface illuminance at a height of 1 m was 300 lx. It was

[Illumination control system]
FIG. 26 is a diagram showing a room model 2000 including a daylighting device and an illumination dimming system.
FIG. 27 is a plan view showing the ceiling of the room model 2000.

In the present invention, the ceiling material forming the ceiling 2003a of the room 2003 into which external light is introduced may have high light reflectivity. As shown in FIGS. 26 and 27, a light-reflective ceiling material 2003A is installed on the ceiling 2003a of the room 2003 as a light-reflective ceiling material. The light-reflecting ceiling material 2003A is intended to promote introduction of external light from the daylighting device 2010 installed in the window 2002 into the interior of the room, and is installed on the ceiling 2003a near the window. There is. Specifically, it is installed in a predetermined area E of the ceiling 2003a (area approximately 3 m from the window 2002).

As described above, the light-reflective ceiling material 2003A is provided with outside light introduced into the room through the window 2002 in which the daylighting device 2010 of the present invention (the daylighting device of any of the above-described embodiments) is installed. It works to efficiently guide the inside of the room. The external light introduced from the lighting device 2010 toward the indoor ceiling 2003a is reflected by the light-reflecting ceiling material 2003A, and turns 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-reflecting ceiling material 2003A may be diffuse-reflecting or specular-reflecting, but it 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 effects of suppressing glare light that is uncomfortable for human beings, it is preferable that the characteristics of both are appropriately mixed.

Most of the light introduced into the room by the lighting device 2010 of the present invention goes to the ceiling in the vicinity of the window 2002, but the amount of light is often sufficient in the vicinity of the window 2002. Therefore, by using the above-described light-reflective ceiling material 2003A together, the light incident on the ceiling (area E) near the window can be distributed to the inner part of the room where the light amount is smaller than at the window.

The light-reflecting ceiling material 2003A is formed by, for example, embossing a metal plate such as aluminum with unevenness of about several tens of microns, or depositing a metal thin film such as aluminum on the surface of a resin substrate having similar unevenness. Or you can create it. Alternatively, the unevenness formed by embossing may be formed by a curved surface having 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 applied in a stripe shape that extends toward the back of the room, the light reflected by the light-reflective ceiling material 2003A is directed in the left-right direction of the window 2002 (direction intersecting the longitudinal direction of the unevenness). spread. When the size and orientation of the window 2002 of the room 2003 are limited, the light-reflecting ceiling material 2003A is used to diffuse the light in the horizontal direction by utilizing such a property, and at the same time, in the inner direction of the room. Can be reflected toward.

The daylighting device 2010 of the present invention is used as a part of the illumination dimming system of the room 2003. The lighting control system includes, for example, a daylighting device 2010, a plurality of indoor lighting devices 2007, a solar radiation adjusting device 2008 installed on a window, a control system 2009 for these, and a light-reflecting ceiling material installed on a ceiling 2003a. 2003A and other components of the entire room.

In the window 2002 of the room 2003, the daylighting device 2010 is installed on the upper side and the solar radiation adjusting device 2008 is installed on the lower side. Here, a blind is installed as the solar radiation adjusting device 2008, but the invention is not limited to this.

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

As shown in FIGS. 26 and 27, for example, a ceiling 2003a of an office in which the length L1 of the window 2002 in the left-right direction (Y direction) is 18 m and the length L2 of the room 2003 in the depth direction (X direction) is 9 m is shown. .. Here, the indoor lighting devices 2007 are arranged in a grid pattern at intervals of 1.8 m in the lateral 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 2007a is configured by integrating the brightness detection unit 2007b and the control unit 2007c. Is.

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 fixture 2007a. The brightness detection unit 2007b receives the reflected light of the illuminated surface illuminated by the indoor lighting fixture 2007a and detects the illuminance of the illuminated surface. Here, the brightness detection unit 200b detects the illuminance of the desk surface 2005a of the desk 2005 placed indoors.

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

FIG. 28 is a graph showing the relationship between the illuminance of light (natural light) that is illuminated in the room by the lighting device and the illuminance (illumination dimming system) of the indoor lighting device.
As shown in FIG. 28, the illuminance on the desk surface by the daylighting device 2010 (natural light collection) decreases as the distance from the window increases. On the other hand, when the indoor lighting device 2007 (illumination dimming system) is installed on the ceiling of the room without installing the daylighting device 2010 on the window, the illuminance on the desk top increases as the distance from the window increases. When the daylighting device 2010 and the indoor lighting device 2007 (lighting dimming system) are used together, the desk top surface in the room is more than when either the daylighting device 2010 or the indoor lighting device 2007 (lighting dimming system) is used. It can be seen that the illuminance of is increasing overall. Due to the effect of the lighting device 2010, the edge of the window is brightest and the brightness is slightly reduced as the distance from the window increases, but a substantially constant illuminance (average illuminance: 750 lx) is obtained.

As described above, by using the daylighting device 2010 and the lighting control system (indoor lighting device 2007) together, it becomes possible to deliver light to the inner part of the room and further improve the brightness of the room. You can Therefore, a more stable bright light environment can be obtained without being affected by the sun altitude.

According to one embodiment of the present invention, a daylighting device is required to efficiently take outdoor natural light (sunlight) into a room and to make a person indoors feel bright to the inner part of the room without feeling glare. Can be applied to.

DESCRIPTION OF SYMBOLS 1... Daylighting device 2... Slat 3... Support mechanism 4, 4A-4E... Daylighting slat 5... Daylighting part 6... Light-shielding slat 7... Light-shielding part 8... Base material 9,9A, 9B... Projection part 9a... 1st surface part 9b. ... 2nd surface part 9c... 3rd surface part 10a... 1st corner part 10b... 2nd corner part 10c... 3rd corner part 11... Base material 12... Ladder code 13... Fixed box 14... Elevating bar 15a, 15b... Vertical cords 16a, 16b... Horizontal cords 17... Elevating operation part 18... Tilt operating part 19... Elevating code 20... Hole 21... Window 22... Operation code 23... Operation lever 30... Light diffuser 31... Fine particles 32... Light diffusion film 40... Daylighting slats 41... First base material 42... Second base material 1000... Room model 1001... Ceiling 1002... Floor 1003... Window glass 1004... Front side wall 1005... Back side wall 1006... Room M, Ma, Mb... People G... Glare area

Claims (9)

A plurality of slats arranged side by side with a space between each other;
And a support mechanism that supports the plurality of slats so that they can be suspended vertically.
At least a part of the plurality of slats is composed of daylighting slats,
The daylighting slats are provided on the first base material having a light-transmitting property, a plurality of protrusions arranged side by side on one surface of the first base material, and the other surface of the first base material , and the daylighting slats are provided. A light diffuser having a pseudo-stripe structure in which stripe-shaped protrusions extending substantially in the lateral direction of are aligned in the longitudinal direction of the first base material ;
Have
The refractive index of the first substrate wherein the plurality of projections are substantially the same, the refractive index of the light diffusing member and the first substrate and the plurality of projections are different,
The lighting slat, the light that has entered the inside from diagonally upward with respect to one surface of the lighting slat, emits obliquely upward from the other surface to the outside,
The light diffuser diffuses light emitted from the other surface to the outside in the vertical direction and the horizontal direction,
A daylighting device having an anisotropic scattering characteristic that spreads light emitted from the other surface to the outside in the horizontal direction rather than in the vertical direction. The lighting slats lighting device according to claim 1 that have a flat second substrate that face each other across a plurality of projections and the air layer of the first substrate. The lighting slat has a plurality of first protrusions formed on an upper surface and a plurality of lower projections having a shape bent at an intermediate portion in a cross section in a direction orthogonal to a longitudinal direction thereof. The lighting device according to claim 1 or 2, wherein a shape of the second projection portion is different from that of the second projection portion. The plurality of slats have a daylighting section configured by the daylighting slats, and a light blocking section located below the daylighting section and configured by slats having a light blocking property,
The daylighting device according to any one of claims 1 to 3, wherein tilting operations of the daylighting unit and the light shielding unit are possible. The daylighting device according to any one of claims 1 to 4, wherein the support mechanism supports the plurality of slats so as to be vertically movable. The daylighting device according to claim 4, wherein the support mechanism supports the daylighting section and the light shielding section so as to be independently tiltable. The daylight slats,
A first base material having optical transparency,
A plurality of protrusions arranged side by side on one surface of the first base material;
A light diffuser that is provided on the other surface of the first base material and has a pseudo stripe structure in which stripe-shaped protrusions that extend substantially in the lateral direction of the daylighting slats are arranged in the longitudinal direction of the first base material. And have,
The refractive index of the first substrate wherein the plurality of projections are substantially the same, the refractive index of the light diffusing member and the first substrate and the plurality of projections are different,
Light that has entered the inside of the first base material from obliquely above is emitted obliquely upward from the other surface of the first base material to the outside,
The light diffuser diffuses light emitted from the other surface to the outside in the vertical direction and the horizontal direction,
A daylighting slat having an anisotropic scattering property that spreads light emitted from the other surface to the outside in the horizontal direction rather than in the vertical direction. Lighting slat of claim 7 that having a flat second substrate that face each other across a plurality of projections and the air layer of the first substrate. The first base material has a shape bent at an intermediate portion in a cross section in a direction orthogonal to its longitudinal direction, and is formed on a plurality of first protrusions formed on an upper surface and a lower surface. The lighting slat according to claim 7 or 8, wherein the plurality of second protrusions have different shapes.