WO2018066264A1 - Daylighting slat and daylighting device - Google Patents

Abstract

The daylighting slat according to one embodiment of the present invention comprises: an optically transparent base material having a plurality of bend portions in a cross section orthogonal to the longitudinal direction; a plurality of optically transparent daylighting units provided on at least a portion of a first surface of the base material; and gaps provided between the plurality of daylighting units. The daylighting slat has the function of reflecting light that has entered a daylighting unit.

Description

Daylighting slat and daylighting device

Some embodiments of the present invention relate to daylighting slats and daylighting devices.
This application claims priority on Japanese Patent Application No. 2016-196356 filed in Japan on October 4, 2016, the contents of which are incorporated herein by reference.

Conventionally, in offices and the like, outdoor natural light (sunlight) is incident indoors (indoors) through a window glass or the like, which may make a person in the room feel dazzling. For this reason, a blind, a curtain, etc. may be arrange | positioned in front of a window glass so that it may not feel glare during work, and from a viewpoint of security or privacy protection. Accordingly, it is possible to prevent light incident from the window glass from being blocked or peeping into the room through the window glass. As such a blind, there is known a blind including a slat having both translucency and light shielding properties in order to adjust the amount of solar radiation (for example, Patent Document 1).

JP 2013-2224 A

However, in the conventional configuration, one slat is configured by combining a non-translucent member such as aluminum and a resin member, and a central portion in the longitudinal direction is locally bent due to a difference in specific gravity or rigidity of each material. There is a risk that.

One aspect of the present invention is made in view of the above-described problems of the prior art, and includes a daylighting slat in which bending of the central portion in the longitudinal direction is suppressed, and such a daylighting slat. An object of the present invention is to provide a daylighting apparatus that can efficiently take natural light (sunlight) indoors and can make a person in the room feel bright without going to the glare.

The daylighting slat according to an aspect of the present invention includes a base material having a plurality of bent portions in a cross section perpendicular to the longitudinal direction and having light transmittance, and light provided on at least a part of the first surface of the base material. A plurality of daylighting units having transparency and a gap provided between the plurality of daylighting units, and having a function of reflecting light incident on the daylighting unit.

In the daylighting slat according to an aspect of the present invention, the base material has a first region located on one side with respect to a first bent portion of the plurality of bent portions, and a second region located on the other side. The width of the first region is wider than the width of the second region, and the plurality of daylighting portions may be provided on at least a part of the first surface of the first region.

In the daylighting slat according to an aspect of the present invention, the plurality of daylighting units may be provided in the second region.

In the daylighting slat according to an aspect of the present invention, the lighting slat further includes a third region located on the opposite side of the first region with respect to the second bent portion of the plurality of bent portions, and the width of the first region is It is good also as a structure wider than the width | variety of the said 3rd area | region.

In the daylighting slat according to an aspect of the present invention, the plurality of daylighting units may be provided in the third region.

In the daylighting slat according to an aspect of the present invention, the second region and the third region may be bent to the same side with respect to the first region.

In the daylighting slat according to one aspect of the present invention, the second region and the third region may be bent to opposite sides with respect to the first region.

The daylighting slat according to an aspect of the present invention may be configured such that at least one of the second region and the third region is provided with a notch for storing a ladder code.

In the daylighting slat according to an aspect of the present invention, at least one of an angle formed between the first region and the second region and an angle formed between the first region and the third region in a cross section perpendicular to the longitudinal direction is Also, a configuration larger than 90 ° may be adopted.

In the daylighting slat according to an aspect of the present invention, at least one of the second region and the third region may have a light absorption property.

In the daylighting slat according to an aspect of the present invention, at least one of an angle formed between the first region and the second region and an angle formed between the first region and the third region in a cross section perpendicular to the longitudinal direction is The angle may be smaller than 90 °.

In the daylighting slat according to an aspect of the present invention, at least one of the second region and the third region may have a light reflecting property.

The daylighting slat according to an aspect of the present invention may further include a light diffusion layer provided on at least a part of the second surface of the base material.

The daylighting slat according to an aspect of the present invention may further include a prism structure provided on at least a part of the second surface of the base material.

A daylighting apparatus according to an aspect of the present invention includes a plurality of slats, and a support mechanism that supports the plurality of slats in a form in which the plurality of slats are suspended in a vertical direction while the longitudinal direction of the slats is horizontally oriented. And at least a part of the plurality of slats is composed of the daylighting slats.

According to one aspect of the present invention, daylighting slats in which the bending of the central portion in the longitudinal direction is suppressed, and outdoor natural light (sunlight) is efficiently taken indoors by using such daylighting slats, and indoors. It is possible to provide a daylighting apparatus that can make a person feel bright up to the interior without feeling dazzling.

The perspective view which shows the external appearance of a blind. The perspective view which shows schematic structure of a lighting plate. FIG. 3 is a side view taken along the line A-A ′ of FIG. 2. The figure which shows a mode when the lighting slat of 1st Embodiment is made into a full open state (horizontal state). The figure which shows a mode when the lighting slat of 1st Embodiment is made into a fully-closed state (vertical state). The figure which shows the structure of the daylighting slat of the comparative example 1. The figure which shows a mode when the blind provided with the lighting slat of the comparative example 1 is a full open state. The figure which shows a mode when the blind provided with the lighting slat of the comparative example 1 is a fully closed state. The figure which shows the structure of the daylighting slat of the comparative example 2. The figure which shows a mode that the existing flat slat was verified by the cantilever. The figure which shows the simulation result by the slat model of the Example which concerns on 1 aspect of this invention. The figure which shows the simulation result by the slat model of the comparative example 2. The figure which shows the structure of the daylighting slat of the modification 1-1 in 1st Embodiment. The figure which shows the structure of the daylighting slat of the modification 1-2 in 1st Embodiment. The figure which shows the structure of the daylighting slat of the modification 1-3 in 1st Embodiment. The figure which shows the structure of the daylighting slat of the modification 1-4 in 1st Embodiment. The figure which shows the structure of the daylighting slat of the modification 1-5 in 1st Embodiment. The side view of the daylighting slat of modification 1-5. The side view which shows the structure of the daylighting slat of 2nd Embodiment. The figure which shows the structure of the modification 2-1 of the daylighting slat in 2nd Embodiment. The figure which shows the structure of modification 2-2 of the daylighting slat in 2nd Embodiment. The figure which shows the other structure of the daylighting slat in 2nd Embodiment. The perspective view which shows the structure (fully closed state) of the blind of 3rd Embodiment. The side view which shows the structure (fully closed state) of the blind of 3rd Embodiment. The perspective view which shows the structure (fully closed state) of the blind of 4th Embodiment. The side view which shows the structure (fully closed state) of the blind of 4th Embodiment. The perspective view which shows the lighting slat with a reinforcement member in 5th Embodiment. The side view which shows the lighting slat with a reinforcement member in 5th Embodiment. The figure which expands and shows the principal part of the lighting apparatus (fully opened state) in 6th Embodiment. The figure which shows the mode at the time of use of the lighting apparatus in 6th Embodiment (fully closed state). The side view which shows the structure of the lighting slat in 7th Embodiment. The figure which shows the mode of the fully open state of the blind of 7th Embodiment. The figure which shows the mode of the fully closed state of the blind of 7th Embodiment. The figure which shows the simulation result by the lighting slat model of 7th Embodiment. The side view which shows the structure of the base material in 8th Embodiment. The side view which shows the structure of the daylighting slat in 8th Embodiment. The side view which shows the structure of the modification of the daylighting slat in 1st Embodiment. FIG. 36 is a side view taken along the line B-B ′ of FIG. 35, which is a room model including a lighting device and an illumination dimming system. The top view which shows the ceiling of a room model. The graph which shows the relationship between the illumination intensity of the light (natural light) daylighted indoors by the lighting apparatus, and the illumination intensity (illumination dimming system) by an indoor lighting apparatus.

Embodiments of the present invention will be described below with reference to the drawings.
In each drawing used for the following description, the scale of each member is appropriately changed to make each member a recognizable size.

[First Embodiment]
First, for example, a blind (lighting device) 1 shown in FIG. 1 will be described as a first embodiment of the present invention.
FIG. 1 is a perspective view showing the appearance of the blind 1. In the following description, the positional relationship (vertical, left / right, front / rear) of the blind 1 is based on the positional relationship (up / down, left / right, front / rear) when the blind 1 is used. Also, the positional relationship of the blind 1 is assumed to coincide with the positional relationship with respect to the paper surface.

Suppose that the vertical direction of the blind 1 in FIG. 1 is the Z direction, the horizontal direction is the X direction, and the front-back direction is the Y direction.

As shown in FIG. 1, the blind 1 supports a plurality of slats 2 arranged in parallel in the horizontal direction (X direction) at intervals and a plurality of slats 2 so as to be suspended in the vertical direction (Z direction). The support mechanism 3 is mainly configured. The blind 1 supports a plurality of slats 2 to be movable up and down and supports a plurality of slats 2 to tilt.

The plurality of slats 2 include a daylighting region 5 constituted by a plurality of daylighting slats 4 having daylighting properties, and a light shielding region 7 constituted by a plurality of light shielding slats 6 having a light shielding property located below the daylighting region 5. And have. In the following description, when the daylighting slat 4 and the light-shielding slat 6 are not particularly distinguished, they are collectively treated as the slat 2.

The daylighting slat 4 constituting the daylighting region 5 includes a daylighting plate 40 extending in one direction as shown in FIG.
FIG. 2 is a perspective view showing a schematic configuration of the daylighting plate.
FIG. 3 is a side view taken along the line AA ′ in FIG.

As shown in FIGS. 2 and 3, the daylighting plate 40 includes a base material 41 having optical transparency and a plurality of daylighting units having optical transparency provided on at least a part of the first surface 41 </ b> A of the base material 41. 42 and a gap portion 43 provided between the plurality of daylighting portions 42.

The base material 41 has a plurality of bent portions C1 and C2 along a straight line parallel to the longitudinal direction in the cross section (A-A 'plane) perpendicular to the longitudinal direction of the daylighting plate 40. The base material 41 includes a first portion 41a positioned on one side of the first bent portion C1 and a first portion 41a positioned on the other side of the first bent portion C1. 2 part 41b, and 3rd part 41c located on the opposite side to 1st part 41a with respect to 2nd bending part C2.

The first portion 41a has a first region 41Aa on the first surface 41A, the second portion 41b has a second region 41Ab on the first surface 41A, and the third portion 41c has a third region 41Ac on the first surface 41A. have. The base material 41 is provided with a plurality of daylighting units 42 in at least the first region 41Aa of the first surface 41A.

The base material 41 of the present embodiment has a bent shape at each of the bent portions C1 and C2, and the second portion 41b and the third portion 41c are mutually in the thickness direction of the base material 41 with respect to the first portion 41a. It is bent to the opposite side. Specifically, the second portion 41 b is bent toward the second surface 41 </ b> B side of the substrate 41, and the third portion 41 c is bent toward the first surface 41 </ b> A side of the substrate 41. The base material 41 of the present embodiment has a short side (second portion 41b), a long side (first portion 41a), a short side (third portion 41c), and a multi-stage bending process in a cross section perpendicular to the longitudinal direction. Have been made.

In this embodiment, the base 41 is bent at the first bent portion C1 and the second bent portion C2, and the second portion 41b and the third portion 41c are predetermined with respect to the first portion 41a. It is a shape that is bent linearly at an angle. Thus, although the example of the bending part C1, C2 bent so that it may have a sharp corner | angular part was given, the bending part C1, C2 which curved gently may be sufficient.

At this time, for example, instead of bending only the portions of the bent portions C1 and C2, it may be curved from the first bent portion C1 and the second bent portion C2 to the end portion. In other words, the second portion 152b and the third portion 152c may be curved opposite to each other with respect to the linear first portion 152a. As a result, as shown in FIG. 33, even when the daylighting portion 42 is formed on substantially the entire first surface 152A of the base material 152, the second portion 152b and the third portion 152c can be adjusted by adjusting the curvatures of the second portion 152b and the third portion 152c. Contact between the daylighting portions 42C at the boundary between the first portion 152a and the third portion 152c can be avoided, and the plurality of daylighting portions 42 can be evenly arranged on the first surface 152A.

In the present embodiment, the angle θ1 formed by the first portion 41a and the second portion 41b constituting the base material 41 and the angle θ2 formed by the first portion 41a and the third portion 41c are equal to each other, and both are 130 °. is there. Note that the angles θ1 and θ2 of the second portion 41b and the third portion 41c with respect to the first portion 41a are not limited to the angles described above, and are appropriately set according to the shape of the daylighting portion 42 formed in the first region 41Aa. Is done. It is preferable that 1st area | region 41 Aa of the 1st part 41a in which the fine structure is formed among the base materials 41 becomes a flat surface. The daylighting unit 42 is not provided in the second region 41Ab of the second portion 41b and the third region 41Ac of the third portion 41c.

Of the base material 41, the width of the first region 41Aa (the width in the direction perpendicular to the longitudinal direction of the daylighting portion 42 (the width in the Y direction)) is larger than the width of the second region 41Ab and the third region 41Ac in the same direction. Widely, the widths of the second region 41Ab and the third region 41Ac are equal to each other. In the base material 41, the ratio of the dimensions of the first area 41Aa, the second area 41Ab, and the third area 41Ac is about 8: 1: 1, and the width of the first area 41Aa is a dimension close to the slat pitch. Preferably there is.

The substrate 41 is made of a light transmissive resin such as a thermoplastic polymer, a thermosetting resin, or a photopolymerizable resin. Further, as the light transmissive resin, those made of acrylic polymer, olefin polymer, vinyl polymer, cellulose polymer, amide polymer, fluorine polymer, urethane polymer, silicone polymer, imide polymer, etc. are 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), polyethersulfone (PES), polyimide (PI), etc. can be used suitably. The total light transmittance of the substrate 41 is preferably 90% or more according to JIS K7361-1. Thereby, sufficient transparency can be obtained.

The daylighting unit 42 is made of, for example, an organic material having optical transparency and photosensitivity such as acrylic resin, epoxy resin, and silicone resin. Moreover, what mixed the polymerization initiator, the coupling agent, the monomer, the organic solvent, etc. can be used for these organic materials. 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. The total light transmittance of the daylighting unit 42 is preferably 90% or more in accordance with JIS K7361-1. Thereby, sufficient transparency can be obtained.

The plurality of daylighting portions 42 extend in the longitudinal direction (X direction) of the base material 41 and are arranged side by side in the short direction (Y direction) of the base material 41. Further, each daylighting section 42 constitutes a prism body having a pentagonal cross section. Specifically, the daylighting portion 42 includes a first surface portion 42a facing the first region 41Aa of the first surface 41A of the base material 41, a second surface portion 42b adjacent to the first surface portion 42a, and a first surface portion 42a. The third surface portion (reflection surface) 42c adjacent on the opposite side of the surface portion 42a and the second surface portion 42b, the fourth surface portion 42d and the fifth surface portion 42d that are inclined in different directions and face the first surface portion 42a. Surface portion (reflection surface) 42e.

Here, since air (gap part 43) exists between each of the plurality of daylighting parts 42, the fourth surface part 42d and the fifth surface part 42e are interfaces between the constituent material of the daylighting part 42 and the air. It becomes. During this time, other low refractive index materials may be filled. However, the difference in refractive index at the interface between the inside and outside of the daylighting unit 42 is maximized when air is present rather than when any low refractive index material is present outside. Therefore, when air is present, the critical angle of light totally reflected by the fifth surface portion 42e or the third surface portion 42c among light incident on the daylighting portion 42 is the smallest according to Snell's law. . Thereby, since the range of the incident angle of the light totally reflected by the fifth surface portion 42e or the third surface portion 42c becomes the widest, the light incident on the daylighting portion 42 is efficiently transferred to the other surface side of the base material 41. Can guide well. As a result, the loss of light incident on the daylighting unit 42 is suppressed, and the luminance of light emitted from the other surface of the base material 41 can be increased.

Desirably, the refractive index of the base material 41 and the refractive index of the daylighting section 42 are substantially equal. For example, when the refractive index of the base material 41 and the refractive index of the daylighting unit 42 are greatly different, when light enters the base material 41 from the daylighting unit 42, it is unnecessary at the interface between the daylighting unit 42 and the base material 41. Light refraction and 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.

Moreover, as a manufacturing method of the lighting plate 40, the several lighting part 42 can be formed on the base material 41 using a photolithographic technique, for example. In addition to the method using the photolithography technique, the daylighting plate 40 can be manufactured by a method such as a melt extrusion method, a mold extrusion method, or an imprint method. In methods such as the melt extrusion method and the mold extrusion method, the base material 41 and the daylighting unit 42 are integrally formed of the same resin.
Moreover, the lighting part 42 may be formed on one surface of the film, and the film may be bonded to the first surface 41 </ b> A of the base material 41. As a method for forming the daylighting portion 42 on one surface of the film, the above-described photolithography technique, imprint method, or the like can be used.

Referring back to FIG. 1, the light shielding slat 6 constituting the light shielding region 7 is composed of a long light-shielding base material 11 having a light shielding property. The light-shielding substrate 11 may be any material that is generally used as a so-called blind slat. Examples thereof include metal, wood, and resin. However, the structure is higher than that of the daylighting slat 4 made of a resin material. Moreover, what gave the surface of the base material 11 for light shielding coating etc. can be mentioned.

In the present embodiment, the light shielding slat 6 is made of a metal material and has a configuration that is more rigid than the daylighting slat 4 made of a resin material. The light-shielding slats 6 are “JIS A4801
In the “steel and aluminum alloy venetian blinds” provision, the slats have a margin of overlap of 3 mm or more when the width is 35 mm or more, and 2 mm or more when the width is less than 35 mm, and when the slat is fully closed, the horizontal direction The other side should not be seen. Therefore, it is preferable to satisfy JIS regulations as the interval between the light shielding slats 6 in the closed state.

Further, the light shielding slats 6 constituting the light shielding region 7 do not have to be made of a material having high light shielding properties. For example, a part of the light shielding slat 6 constituting the light shielding region 7 may be constituted by a colored slat having a colored light transmission property. Thus, by using all or part of the light-shielding slats 6 as colored slats, it is possible to improve indoor brightness as compared with slats that completely shield external light. In addition, a comfortable indoor environment can be obtained without excessive glare light entering the line of sight of a person in the room or the personal computer monitor. Furthermore, there is no worry of peeping into the room from the outside, and the privacy of the person in the room is ensured.

The cross-sectional shape perpendicular to the longitudinal direction of the light shielding slat 6 may be different from the shape of the daylighting slat 4 shown in FIG. 3 or the same shape. If it is the same shape as the daylighting slat 4, generation | occurrence | production of an unnecessary stress etc. can be suppressed when the light shielding slat 6 is accommodated.

The support mechanism 3 includes a plurality of ladder cords 12 arranged in parallel in the vertical direction (short direction of the plurality of slats 2), a fixing box 13 that supports upper end portions of the plurality of ladder cords 12, and a plurality of ladder cords 12. And an elevating bar 14 attached to the lower end.
A pair of ladder cords 12 are arranged side by side on both the left and right sides of the center portion of the plurality of slats 2.

The fixed box 13 is positioned at the top of the plurality of slats 2 arranged in parallel to 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 lowermost part of the plurality of slats 2 arranged in parallel to each other, and is arranged in parallel with the plurality of slats 2.

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

The elevating operation unit 17 has a plurality of elevating cords 19. The plurality of lifting / lowering cords 19 are arranged in parallel with the ladder cord 12. Further, the plurality of lift cords 19 are attached to the lift bar 14 at the lower ends thereof through the holes 20 formed in each slat 2.

The upper and lower ends of the plurality of lifting / lowering cords 19 are drawn inside the fixed box 13 and drawn out from the window portion 21 provided on one side of the fixed box 13. The lifting / lowering cord 19 drawn 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 lift bar 14.

In the lifting / lowering operation unit 17, the lifting / lowering cord 19 is pulled into the inside of the fixed box 13 by pulling the operation cord 22 from the state where the lifting / lowering bar 14 is located at the lowermost part. As a result, the plurality of slats 2 rise together with the lift bar 14 while overlapping the lift bar 14 in order from the lower side. The lifting / lowering cord 19 is fixed by a stopper (not shown) provided inside the window portion 21. Thereby, the raising / lowering bar 14 can be fixed in arbitrary height positions. On the contrary, the lifting bar 14 can be lowered by its own weight by releasing the fixing of the lifting cord 19 by the stopper. Thereby, the raising / lowering bar 14 can be located in the lowest part again.

As shown in FIG. 1, the tilting operation unit 18 has an operation lever 23 on one side of the fixed box 13. The operation lever 23 is attached to be rotatable about an axis. In the tilt operation unit 18, the ladder cord 12 can be operated by rotating the operation lever 23 around the axis. Thus, the plurality of slats 2 are tilted while being synchronized with each other between a fully open state (FIG. 4A) in which the slats 2 are opened and a fully closed state (FIG. 4B) in which the slats 2 are closed. be able to.

When the blind 1 according to the present embodiment is used, the light incident on the room through the window glass is irradiated toward the indoor ceiling by the plurality of daylighting slats 4 constituting the daylighting area 5, and the light shielding area. The light directed to the glare region can be shielded by the plurality of light shielding slats 6 constituting the light source 7.

Therefore, according to the blind 1, outdoor natural light (sunlight) is efficiently taken into the room through the daylighting region 5, and the interior is made brighter without making the person in the room feel dazzling. It is possible. On the other hand, it is possible to block the light incident from the window glass by the light blocking region 7 and prevent the room from being looked into through the window glass.

FIG. 4A is a diagram illustrating a state when the daylighting slat 4 according to the first embodiment is fully opened (horizontal state). FIG. 4B is a diagram illustrating a state when the daylighting slat 4 according to the first embodiment is in a fully closed state (vertical state).
In the blind 1, by tilting the plurality of slats 2, the posture of the slats 2 is changed between the fully open state shown in FIG. 4A and the fully closed state shown in FIG. 4B, and the angle of the light toward the ceiling in the lighting area Can be adjusted. Here, in order to efficiently obtain the daylighting performance of the daylighting slat 4 in the fully closed state shown in FIG. 4B, the region where the fine structure is formed (first portion 41a) is in a vertical posture along the vertical direction. It is ideal.

In the case of existing blinds equipped with daylighting slats without multi-stage bending, the microstructure surface of the daylighting slats does not become perpendicular to the vertical direction when fully closed, and tilts at an angle of approximately 15 ° ± 5 °. It was.

On the other hand, in the configuration of the present embodiment, since the 130 ° bending process is performed at two locations of the daylighting slats 4, the first portions 41a of the daylighting slats 4 arranged in the up and down direction by the turning operation. In the fully closed state (FIG. 4B) in which the posture is substantially perpendicular to the window glass 1003, the first portion 41 a of each daylighting slat 4 is in a posture substantially parallel to the window glass 1003. Therefore, it is possible to obtain the maximum lighting characteristics designed in the fully closed state.

Further, in order to obtain the maximum lighting characteristics in the fully closed state of the blind 1, the gap between the first portions 41 a of the daylighting slats 4 adjacent to each other in the vertical direction in the fully closed state is small, and the first lighting slat 4 has the first gap. It is preferable that the portions 41a exist densely. In order to make the first portion 41a dense in the fully closed state, the widths of the first portion 41a, the second portion 41b, and the third portion 41c, the second portion 41b and the third portion 41c with respect to the first portion 41a are formed. It is preferable to design the angles θ1, θ2, slat width and adjacent slat pitch.

[Example 1]
The daylighting slat 4 according to the first embodiment of the present invention is manufactured by multi-stage bending, and has the following dimensional shape.
-Length L in the extending direction (FIG. 2): 1000 mm
-Width W in the transverse direction intersecting the extending direction (FIG. 3): 25 mm
・ Slat thickness T (Fig. 3): 0.5mm
・ Slat pitch P (FIG. 4B): around 20 mm

As described above, in the daylighting slat 4 of the first embodiment, it is preferable that the width W1 of the central first portion 41a is close to the slat pitch P. Here, in the fully closed state, it is preferable that the first portion 41a of the lower-side daylighting slat 4 is not shaded by the third portion 41c of the upper-side daylighting slat 4. Thereby, the direct sunlight passing between the daylighting slats 4 is reduced, and the light incident on the first portion 41a of each daylighting slat 4 can be increased, so that the daylighting performance can be improved.

The extent to which the daylighting slats are arranged in the fully closed state (daylighting area ratio) can be determined using, for example, Comparative Example 1 and Comparative Example 2 as follows.

[Comparative Example 1]
FIG. 5 is a diagram illustrating a configuration of a daylighting slat of Comparative Example 1.
In the case of the daylighting slat 84 shown in FIG. 5, it is bent at the center portion of the slat in the width direction intersecting the longitudinal direction, and has a symmetrical cross-sectional shape via the bent portion C. The width W1 of the first portion 81a located on one side of the bent portion C and the width W2 of the second portion 81b located on the other side are the same. A plurality of daylighting units 42 are provided in each region of the first portion 81a and the second portion 81b. In other words, the daylighting section 42 is disposed on the entire surface of the first portion 81 a of the base material 81.

Accordingly, the width W1 of the first portion 81a is W1 = W3 × (1 / cos ((180−θ) / 2). Here, in a commercially available blind, the slat pitch adjacent to the slat width W3 Assuming that this commercially available blind slat is changed to the daylighting slat 84 of Comparative Example 1, P3 satisfies W3 / P≈1.2.
Here, in the fully closed state, the ratio of the first portion 91a in the slat pitch P becomes the daylighting area ratio as it is. Therefore, when the above-described relational expression is used as a relational expression between the slat pitch P and the width W1 of the first portion 81a, the expression is transformed into W1 / P≈1.2 × (1/2) × (1 / cos ((180− θ) / 2) Here, for example, if θ = 150 °, W1 / P≈0.62, and the daylighting area ratio is 62%.

FIG. 6A is a diagram illustrating a state in which a blind (lighting device) 80 including the daylighting slats 84 of Comparative Example 1 is in a fully opened state. FIG. 6B is a diagram illustrating a state where the blind 80 including the daylighting slats 84 of Comparative Example 1 is in a fully closed state.
In the daylighting device including the daylighting slat 84 of Comparative Example 1, as shown in FIGS. 6A and 6B, the angle of the light toward the ceiling in the daylighting region 5 by tilting the plurality of slats 2 (daylighting slats 84). Can be adjusted.

On the other hand, in the light shielding region 7, by tilting the plurality of slats 2 (light shielding slats 6), light incident from between the light shielding slats 6 is adjusted, or through the window glass 1003 from between the light shielding slats 6. You can see the outdoors.

[Comparative Example 2]
FIG. 7 is a diagram illustrating a configuration of the daylighting slat 94 of the second comparative example.
In the case of the daylighting slat 94 shown in FIG. 7, in order to increase the daylighting area, it is bent at a portion biased to one end side in the width direction intersecting the longitudinal direction of the base material 91 and has a cross-sectional shape that is asymmetric. Here, the width W2 of the second portion 91b located on the other side is shorter than the width W1 of the first portion 91a located on one side of the bent portion C. A plurality of daylighting units 42 are provided in the first portion 91a.
If the angle formed by the first portion 91a and the second portion 91b is, for example, θ = 130 °, W1 / P≈0.94, and the lighting area ratio is 94%.

In the case of the blind 80 provided with the daylighting slats 84 of Comparative Example 1 described above, the central portion in the longitudinal direction is easily bent when fully opened. That is, since the cross-sectional shape is symmetrical, the first portion 81a and the second portion 81b bend evenly when the horizontal posture is set in the fully opened state. Further, in the case of the daylighting slat 94 of Comparative Example 2 in which the cross-sectional shape is asymmetrical in order to increase the daylighting area, the first portion 91a having a wider width in the cross-sectional direction is more likely to bend due to large gravity.
In this way, when the slats are bent downward when the blinds are fully opened, the outside scenery is partially blocked by the slats located above and below contacting each other. This makes it difficult to see the light and makes it impossible to incorporate light into the room.

Next, the bending state of the existing flat slat will be verified.
FIG. 8 is a diagram illustrating a state in which an existing flat slat is verified with a cantilever beam.
As shown in FIG. 8, the existing flat slat 104 has one end in the longitudinal direction fixed to the support member 105 in a cantilever shape, and the free end 104b side is vertically downward with the fixed end 104a side as a fulcrum. To bend and deform.
-Slat substrate: PET material with a thickness of 250 µm-Beam length L: 200 mm
・ Load: Own weight only

The slat deflection σ as shown in FIG. 8 becomes a problem when the blind is fully open. Therefore, the slat models of Example 1 and Comparative Example 2 were respectively created and a structural calculation simulation was performed.
FIG. 9 is a diagram illustrating a simulation result by the slat model of Example 1 according to an aspect of the present invention. FIG. 10 is a diagram illustrating a simulation result by the slat model of Comparative Example 2. In FIG. 9 and FIG. 10, a portion with a large amount of bending is shown in black.
As shown in FIGS. 9 and 10, in any of the slat models 4 and 94, the free end 4b and the free end 94b side are most bent, but the slat model 94 of Comparative Example 2 shown in FIG. The cross-sectional torsion is larger than that of the slat model 4 of Example 1 shown in FIG. 9, and local bending occurs. On the other hand, in the slat model 4 of Example 1 shown in FIG. 9, since it bends uniformly in the cross-sectional direction which cross | intersects a longitudinal direction, without producing a twist, local bending is suppressed.

In this embodiment, the local bending at the central portion in the longitudinal direction can be suppressed by having two bent portions C1 and C2 in the width direction intersecting the longitudinal direction of the daylighting slat. Moreover, in the fully closed state of the blind 1, the 1st part 41a of the base material 41 in the lighting slat 4 will be in the attitude | position in alignment with a perpendicular direction, and the desired lighting performance can be obtained.

(Modification 1)
Below, the modification of the daylighting slat in 1st Embodiment is demonstrated.
“Modification 1-1”
FIG. 11 is a diagram illustrating a configuration of a daylighting slat 4A according to Modification 1-1 of the first embodiment.
In the first embodiment, the fine structure is provided only in the first region 41Aa of the first portion 41a in the daylighting slat 4, but not limited to this configuration, for example, like the daylighting slat 4A shown in FIG. In addition to the first region 41Aa of the first portion 41a, a plurality of daylighting sections 42 may be provided in the second region 41Ab of the second portion 41b and the third region 41Ac of the third portion 41c.

"Modification 1-2"
FIG. 12 is a diagram illustrating a configuration of a daylighting slat 4B according to Modification 1-2 of the first embodiment.
Like the daylighting slat 4B shown in FIG. 12, the daylighting part 42B comprised by the prism body whose cross-sectional shape of the direction which cross | intersects a longitudinal direction is trapezoid (rectangular) shape may be provided. Furthermore, the cross-sectional shape of the daylighting unit can be appropriately changed such as a pentagon or a hexagon.

"Modification 1-3"
FIG. 13 is a diagram illustrating a configuration of a daylighting slat 4C according to Modification 1-3 of the first embodiment.
Like the daylighting slat 4C shown in FIG. 13, the daylighting part 42C comprised of a prism body whose cross-sectional shape in the direction intersecting the longitudinal direction is a triangular shape may be provided. Furthermore, the cross-sectional shape of the daylighting section can be appropriately changed such as a regular triangle or a right triangle.

"Modification 1-4"
FIG. 14 is a diagram illustrating a configuration of a daylighting slat 4D according to Modification 1-4 of the first embodiment.
As in the daylighting slat 4D shown in FIG. 14, a plurality of daylighting portions 42D are formed on the first portion 41a on the second surface 41B side (surface opposite to the first surface 41A) side of the base material 41, You may install the fine structure side in which the lighting part 42D was formed toward the indoor side.

"Modification 1-5"
FIG. 15 is a perspective view illustrating a configuration of a daylighting slat 4E according to Modification 1-5 of the first embodiment. FIG. 16 is a side view of a daylighting slat 4E according to Modification 1-5.
As in the daylighting slats 4E shown in FIGS. 15 and 16, notches 8 and 9 through which the ladder cord 12 shown in FIG. 1 is inserted are respectively formed in predetermined portions of the second portion 41b and the third portion 41c. May be. The notches 8 and 9 for storing the ladder code are portions cut out in the direction intersecting the longitudinal direction, and the notches 8 of the second portion 41b have dimensions up to the center portion in the width direction. The notch 9 of the 3 part 41c is formed over the whole width direction of the 3rd part 41c. Further, the shapes of the notches 8 and 9 are not limited to those illustrated, and can be appropriately changed as long as the ladder cord 12 can be accommodated.

Further, as in the daylighting slat 4E shown in FIGS. 15 and 16, the second portion 41b and the third portion 41c may be bent perpendicularly to the first portion 41a. In the previous embodiment, the inclination angle θ of the second part 41b and the third part 41c with respect to the first part 41a was 130 °, but the present invention is not limited to this, and the inclination angle θ may be 90 °.

The width ratio of the second portion 41b and the third portion 41c is not particularly limited, but the cross-sectional shape is preferably symmetrical. If the width of the second portion 41b and the third portion 41c is too large with respect to the first portion 41a, the second portion 41b and the third portion 41c become wrinkles, and a plurality of daylighting units provided in the first portion 41a This is not preferable because it impedes the incidence rate of light on 42. Therefore, it is preferable that the 1st part 41a is a dimension wider than the 2nd part 41b and the 3rd part 41c in the direction which cross | intersects the extending direction.

[Second Embodiment]
Next, the configuration of the daylighting slat and the daylighting device according to the second embodiment of the present invention will be described.
The basic configuration of the daylighting slat and the daylighting device of the present embodiment described below is substantially the same as that of the first embodiment, but differs in that light diffusion characteristics are further added. Therefore, in the following description, differences from the previous embodiment will be described in detail, and descriptions of common parts will be omitted. In the drawings used for the description, the same reference numerals are given to the same components as those in FIGS.

FIG. 17 is a side view showing the configuration of the daylighting slat according to the second embodiment.
As shown in FIG. 17, the daylighting slat 24 of this embodiment is configured to include a light diffusion layer 25 that diffuses light on the second surface 41 </ b> B side of the base material 41. The light diffusion layer 25 is provided on the side opposite to the fine structure surface of the base material 41 and diffuses and emits the light bent in the daylighting unit 42. The light diffusion layer 25 may have any of isotropic diffusion and anisotropic diffusion characteristics, and is selected according to the purpose.

According to the configuration of the present embodiment, glare light is dispersed at various other angles by the light diffusing layer 25, and glare due to light having high directivity that has been taken can be mitigated. Thereby, a comfortable indoor environment can be obtained without excessive glare light entering the line of sight of a person in the room, a personal computer monitor or the like.

Below, the structure of the modification of the lighting slat in 2nd Embodiment is described.
“Modification 2-1”
FIG. 18 is a diagram illustrating a configuration of a variation 2-1 of the daylighting slat according to the second embodiment.
Like the daylighting slat 24A shown in FIG. 18, the light diffusion layer 25 may be provided on the entire second surface 41B opposite to the first surface 41A on which the fine structure of the base material 41 is formed. In addition, a plurality of daylighting units 42 may be provided not only in the first region 41Aa of the first portion 41a in the base material 41 but also in the second region 41Ab of the second portion 41b.

“Modification 2-2”
FIG. 19 is a diagram illustrating a configuration of a modification 2-2 of the daylighting slat according to the second embodiment.
As a daylighting slat 24B shown in FIG. 19, a plurality of daylighting portions 42 are formed on the entire first surface 41A of the base material 41, and a light diffusion layer 25 is provided on the entire second surface 41B. Also good.

FIG. 20 is a diagram illustrating another configuration of the daylighting slat according to the second embodiment.
In the present embodiment, the configuration including the light diffusion layer 25 as a means for imparting light diffusion characteristics has been described. However, the present invention is not limited to this. For example, as shown in FIG. It is good also as a structure which provided the diffusion film (prism structure) 26. FIG. Specifically, as shown in FIG. 20, a light diffusion film 26 in which a plurality of prism portions 26a are formed on a base material 26b is provided on the first portion 41a of the second surface 41B of the base material 41. It is good also as a structure. Each prism portion 26a has a triangular cross-sectional shape that intersects the longitudinal direction, and is arranged with a predetermined interval between the prism portions 26a adjacent to each other in the arrangement direction (vertical direction). The light diffusion film 26 is bonded to the first portion 41a of the second surface 41B of the base material 41 via an adhesive (not shown).
As described above, the light emitted may be diffused by providing the light diffusion film 26 as the second fine structure on the light emission surface (second surface 41B) side of the base material 41.

[Third Embodiment]
Next, the structure of the daylighting slat and the daylighting device according to the third embodiment of the present invention will be described.
The basic configuration of the daylighting slat and the daylighting apparatus of the present embodiment shown below is substantially the same as that of the first embodiment, but differs in that a light shielding property is imparted to a part of the daylighting slat. Therefore, in the following description, differences from the previous embodiment will be described in detail, and descriptions of common parts will be omitted. In the drawings used for the description, the same reference numerals are given to the same components as those in FIGS.

FIG. 21 is a perspective view showing the configuration (fully closed state) of the blind according to the third embodiment. FIG. 22 is a side view showing the configuration (fully closed state) of the blind according to the third embodiment.
As shown in FIG. 21, the blind (lighting device) 30 of the present embodiment includes a plurality of daylighting slats 34 that partially have light shielding properties. As shown in FIG. 22, in the daylighting slat 34, the second portion 41b and the third portion 41c other than the first portion 41a provided with the fine structure in the base material 41 are each in an arbitrary color (for example, black, blue). Is colored. Of the light incident on the daylighting slat 34, light incident at a low angle is incident on the first portion 41a in which the plurality of daylighting parts 42 are formed, and is bent and emitted upward in the room in each daylighting part 42. Is done. On the other hand, light incident at a high angle is reflected or absorbed outward in the colored third portion 41c, and thus does not pass through the slats.

As described above, by coloring the second portion 41b and the third portion 41c other than the first portion 41a in the daylighting slats 34, a large amount of low-angle light in the cold winter season can be taken into the room. At the same time, it is possible to prevent the high-angle light in the thick summer season from being taken into the room by reflecting or absorbing the light to the outside. In this way, it is possible to obtain an optimal daylighting action for each season.

In this embodiment, notches 8 and 9 for inserting the ladder cord 12 (FIG. 1) may be formed in each of the second portion 41b and the third portion 41c.

In the present embodiment, the second portion 41b and the third portion 41c are provided with light shielding properties (light absorption properties). However, the present invention is not limited to this, and at least one of the second portion 41b and the third portion 41c has light shielding properties. It is good also as a structure which gave. Although it differs depending on the configuration of the blinds, it is preferable to provide light shielding properties to the lower part of the second part 41b and the third part 41c relative to the first part 41a in the fully closed state.

[Fourth Embodiment]
Next, the configuration of the daylighting slat and the daylighting device according to the fourth embodiment of the present invention will be described.
The daylighting slats of the present embodiment shown below are different from the previous embodiments in that the inclination angle of the third portion with respect to the first portion and the light reflectivity are imparted to the third portion. Therefore, in the following description, differences from the previous embodiment will be described in detail, and descriptions of common parts will be omitted.
Further, in each drawing used for the description, the same reference numerals are given to portions common to FIGS. 21 and 22.

FIG. 23 is a perspective view showing the configuration (fully closed state) of the blind according to the fourth embodiment. FIG. 24 is a side view showing the configuration (fully closed state) of the blind according to the fourth embodiment.
In each daylighting slat 44 in the blind (lighting device) 45 of this embodiment shown in FIG. 23, the inclination angle θ of the third portion 41c with respect to the first portion 41a provided with the fine structure in the base material 41 becomes an acute angle. Yes.

As shown in FIGS. 23 and 24, the third portion 41c is largely bent toward the first portion 41a, and the inclination angle θ with respect to the first portion 41a is less than 90 °, which is about 60 ° here. It is said that. In the present embodiment, when viewed from the direction intersecting the longitudinal direction of the daylighting slat 44, several daylighting parts 42 provided on the lower side among the plurality of daylighting parts 42 formed in the first portion 41a are: The third portion 41c that is largely bent is hidden by the third portion 41c.

Furthermore, in the present embodiment, light reflectivity is imparted to the third portion 41c. Examples of a method for imparting light reflectivity to the third region 41Ac of the third portion 41c include a mirror member or a scattering reflection member. In the present embodiment, the third region 41Ac is provided over substantially the entire third region 41Ac. In addition, it is good also as a structure which provided light reflectivity partially instead of the whole 3rd area | region 41Ac.

According to the present embodiment, the high-angle light incident on the third portion 41c of the daylighting slat 44 is reflected toward the first portion 41a side by the third portion 41c and enters the daylighting portion 42. In this way, high-angle light incident on the third portion 41c can be effectively used without reflecting outward.

In the case of a building that is difficult for direct sunlight to enter, such as a north-facing window or a building with a long fence, the lower end side (third portion 41c) of the slat may be bent upward. Thereby, since the light reflected and diffused in the third portion 41c can also be used, a bright environment can be ensured even in a room with poor sunlight.

[Fifth Embodiment]
Next, the structure of the daylighting slat and the daylighting device according to the fifth embodiment of the present invention will be described.
The basic configurations of the daylighting slat and the daylighting device of the present embodiment described below are substantially the same as those of the first to third embodiments, but differ in that the daylighting slat is provided with a reinforcing member. Therefore, in the following description, differences from the previous embodiment will be described in detail, and descriptions of common parts will be omitted. Moreover, in each drawing used for description, the same reference numerals are given to portions common to the previous embodiment.

FIG. 25 is a perspective view showing a daylighting slat with a reinforcing member in the fifth embodiment.
FIG. 26 is a side view showing a daylighting slat with a reinforcing member in the fifth embodiment.
As shown in FIG. 25, a reinforcing member 51 is attached to each daylighting plate 40 in the daylighting slat 54 of the present embodiment. The reinforcing member 51 is attached so as to cover the second surface 41 </ b> B side of the base material 41. The reinforcing member 51 is made of a metal material or a resin material. When using a resin material, the reinforcing member 51 is preferably formed thicker than the daylighting slat 4 and has a higher rigidity.

The reinforcing member 51 includes a central portion 51a that faces the first portion 41a on the second surface 41B side of the daylighting slat 54, and a second portion that engages with the second portion 41b of the daylighting slat 54 on one end side of the central portion 51a. The engaging portion 51b is configured to include a third engaging portion 51c that is engaged with the third portion 41c of the daylighting slat 54 on the other end side of the central portion 51a.

As shown in FIG. 26, the central portion 51 a has a length corresponding to the width of the first portion 41 a of the daylighting slat 54.
The second engaging portion 51b is bent so as to be folded back from the second surface 41B side of the second portion 41b of the daylighting slat 54 toward the first surface 41A side, and the second portion of the daylighting slat 4 is formed inside. There is a gap S2 that engages with 41b.
The third engaging portion 51c is bent so as to be folded back from the second surface 41B side to the first surface 41A side of the third portion 41c of the daylighting slat 54, and the third portion of the daylighting slat 54 is formed inside. There is a gap S3 that engages with 41c.

In this way, the reinforcing member 51 formed along the shape of the daylighting slat 54 has the second portion 41b and the third portion 41c of the daylighting slat 54 in the gaps S2 and S3 from one end side in the longitudinal direction of the daylighting slat 4. Are respectively attached to predetermined positions of the daylighting slats 54. Here, when a notch is formed in the daylighting slat 4, it is preferable to form a notch in the reinforcing member 51.

In existing daylighting slats, the portion through which the ladder cord 12 (FIG. 1) is inserted serves as a fulcrum, so that the strength is weak and locally deformed, particularly when a notch for inserting the ladder cord 12 is formed. There was a problem that was likely to occur.

For this reason, by attaching the reinforcing member 51 as in the present embodiment to the daylighting slat 54, the strength of the daylighting slat 54 can be increased, and deformation can be suppressed. In particular, by attaching the reinforcing member 51 to the ladder cord portion of the daylighting slat 54 (position where the notch is formed), the periphery of the notch on the daylighting slat 4 side can be reinforced by the reinforcing member 51. Thereby, the slat strength is significantly improved as compared with the configuration in which the reinforcing member 51 is not provided, and local deformation of the daylighting slat 4 can be suppressed.
The reinforcing member 51 may be attached not only to the daylighting slat 4 but also to the light shielding slat 6.

[Sixth Embodiment]
Next, the structure of the daylighting slat and the daylighting device according to the sixth embodiment of the present invention will be described.
The daylighting device of the present embodiment shown below includes a daylighting slat whose bending direction is different from that of the previous embodiment. Therefore, in the following description, it demonstrates in detail in a different point from previous embodiment, and abbreviate | omits description of a common location.

FIG. 27A is an enlarged view showing a main part of the daylighting device (fully opened state) in the sixth embodiment. FIG. 27B is a diagram illustrating a state (fully closed state) during use of the daylighting device according to the sixth embodiment.
As shown in FIG. 27A, in the blind (lighting device) 60 of the present embodiment, the second portion 41b of the base material 61 is bent and formed on the first surface 41A side, and the third portion 41c is the second surface 41B. It is formed with a daylighting slat 64 that is bent to the side and has a bending direction opposite to that of the previous embodiment. In the daylighting slat 64, a plurality of daylighting portions 42 are formed from the first portion 41a on the first surface 41A side to the second portion 41b, and no daylighting portion 42 is provided in the third portion 41c.

Such a daylighting slat 64 is different from the previous embodiment in the direction of tilting the slat when the operation lever 23 (FIG. 1) is operated, and a fine structure is formed when the blind 60 is fully opened. When the first surface 41A side is directed downward (the light diffusion layer 25 side provided on the second surface 41B side is upward) and the blind 60 is fully closed, as shown in FIG. It is assumed that the structural surface side faces the outdoor (window glass) side.

By setting it as the structure of this embodiment, when the blind 60 is made into a full open state, the bending of the lighting slat 64 made into the horizontal attitude | position can be suppressed.
Note that the shading slats may have the same shape as the daylighting slats 64 of the present embodiment.

[Seventh Embodiment]
Next, the structure of the daylighting slat and the blind of 7th Embodiment of this invention is demonstrated.
The blind according to this embodiment shown below includes a lighting slat having a shape different from that of the lighting slat in the previous embodiment.
FIG. 28 is a side view showing the configuration of the daylighting slat in the seventh embodiment.
As shown in FIG. 28, in the daylighting slat 74 of the present embodiment, the second portion 71b and the third portion 71c are bent in the same direction with respect to the first portion 71a of the base material 71. Specifically, the second portion 71b and the third portion 71c are bent to a second surface 71B opposite to the first surface 71A on which the plurality of daylighting portions 42 are formed. Each inclination angle θ of the second portion 71b and the third portion 71c with respect to the first portion 71a is 130 °.

FIG. 29A is a diagram illustrating a state in which the blind according to the seventh embodiment is fully opened.
FIG. 29B is a diagram illustrating a state in which the blind according to the seventh embodiment is in a fully closed state.
As shown in FIGS. 29A and 29B, the daylighting slat 74 is formed with a notch 9 for inserting the ladder cord 12 through the third portion 71 c of the base material 71. By forming the notch 9, the first portion 71a can be in a vertical posture when the blind (lighting device) 70 is fully closed.
In addition, when it is not necessary to make the 1st part 71a of the lighting slat 74 into a vertical attitude | position, the notch 9 does not need to be formed.

Next, a cantilever beam was used to verify the deflection of the daylighting slats in this embodiment.
FIG. 30 is a diagram illustrating a simulation result by the daylighting slat model of the seventh embodiment.
The daylighting slat 74 has one end in the longitudinal direction fixed to a support member (not shown) in a cantilever shape, and the free end 74b side is bent and deformed downward in the vertical direction with the fixed end 74a side as a fulcrum. ing.
-Slat substrate: PET material with a thickness of 250 µm-Beam length L: 200 mm
・ Load: Own weight only

As shown in FIG. 30, the free end 74b side is most bent, but the cross-section is not twisted and the cross-section is bent uniformly, and local bending is suppressed. Thus, even if the bending direction of the 2nd part 41b and the 3rd part 41c in the base material 41 is the same direction, it is effective in local bending improvement.

[Eighth Embodiment]
Next, the structure of the daylighting slat and the blind according to the eighth embodiment of the present invention will be described.
FIG. 31 is a side view showing the configuration of the base material in the eighth embodiment.
FIG. 32 is a side view showing the configuration of the daylighting slat in the eighth embodiment.
As shown in FIG. 31, the base material 141 in this embodiment is provided with bent portions C11 and C21 in the second portion 141b and the third portion 141c, respectively. Each of the bent portions C11 and C21 is provided outside the first bent portion C1 and the second bent portion C2 in the short direction of the base material 141, respectively. The second portion 141b and the third portion 141c are bent at a predetermined angle at each of the bent portions C11 and C21.

The angles θ1, θ2, θ3, and θ4 in the first bent portion C1, the second bent portion C2, and the bent portions C11 and C21 are set to 150 °, respectively. By setting the angles θ1, θ2, θ3, and θ4 of the bent portions C1, C2, C11, and C21 to 150 °, the inclination of the bent portion becomes gentle, and the base material 141 that forms a multistage bent shape is easy. become.

As shown in FIG. 32, the daylighting slat 140 of this embodiment includes the base material 141 described above, a large number of daylighting portions 42 </ b> C formed on the first surface 141 </ b> A of the base material 141, and the second surface 141 </ b> B of the base material 141. And a light diffusing layer 25 provided on the surface.

In the present embodiment, the daylighting portion 42C is provided on substantially the entire first surface 141A of the base material 141, and the light emitted from the daylighting portion 42C provided in the first region 141Aa, the second region 141b, and the second region 141Aa. Of the three regions 141c, light emitted from the daylighting portion 42C provided in the region inside the bent portions C11 and C21 and light emitted from the daylighting portion 42C provided in the region outside the bent portions C11 and C21. The emission angle can be made different for each of the emitted light.

The bent portions C11 and C21 are provided in the second portion 141b and the third portion 141c to further increase the bent portions of the entire base material 141, whereby the first portion 141a, the second portion 141b, and the third portion 141c are injected. The light emission angle can be changed.
As described above, by increasing the number of the bent portions in the base material 141, it is possible to suppress the bending in the longitudinal direction of the base material 41 and to emit the emitted light at various angles. Be able to.
The dimensions such as the width W in the short direction intersecting the extending direction and the width W1 of the first portion 141a are appropriately set.

[Example]
<Configuration of base material 141>
Length of the first part 141a: 17mm
Length of both sides of the bent portion C11 of the second portion 141b: 2mm
Length of both sides of the bending portion C21 of the third portion 141c: 2mm
Base material 141 thickness: 0.5 mm
Width W in the short direction intersecting the extending direction: 25 mm

The preferred embodiments according to one aspect of the present invention have been described above with reference to the accompanying drawings, but it goes without saying that one aspect of the present invention is not limited to such examples. It is obvious for those skilled in the art that various changes or modifications can be conceived within the scope of the technical idea described in the claims. It is understood that it belongs to. You may combine the structure of each embodiment suitably. In the above-described embodiment, an example in which a single flat plate is bent is mainly illustrated and described. However, a curved slat that is curved may be used in addition to this example.

[Lighting control system]
FIG. 34 is a side view taken along the line BB ′ of FIG. 35, showing a room model 2000 equipped with a daylighting device and an illumination dimming system. FIG. 35 is a plan view showing the ceiling of the room model 2000. FIG.

In the room model 2000, the ceiling material constituting the ceiling 2003a of the room 2003 into which external light is introduced may have high light reflectivity. As shown in FIGS. 34 and 35, a light-reflective ceiling material 2003A is installed on the ceiling 2003a of the room 2003 as a ceiling material having light reflectivity. The light-reflective ceiling material 2003A is intended to promote the introduction of outside 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. Yes. 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 is configured to transmit the outside light introduced into the room through the window 2002 in which the daylighting device 2010 (the daylighting device of any of the above-described embodiments) is installed. Efficiently leads to the back. The external light introduced from the lighting device 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 effects of suppressing glare light that is unpleasant for humans, it is preferable that the characteristics of the two are appropriately mixed.

Most of the light introduced into the room by the daylighting apparatus 2010 goes to the ceiling near the window 2002, but the light quantity in the vicinity of the window 2002 is often sufficient. Therefore, by using together the light-reflective ceiling material 2003A as described above, the light incident on the ceiling (region E) in the vicinity of the window can be distributed toward the back of the room where the amount of light is small compared to the window.

The light-reflective 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 on which similar unevenness is formed. Can be created. Or the unevenness | corrugation formed by embossing may be formed in the curved surface of a larger period.

Furthermore, by appropriately changing the emboss shape formed on the light-reflective ceiling material 2003A, it is possible to control the light distribution characteristics and the light distribution in the room. For example, when embossing is performed in a stripe shape extending toward the back of the room, the light reflected by the light-reflective ceiling material 2003A is in the left-right direction of the window 2002 (direction intersecting the longitudinal direction of the unevenness). spread. When the size and direction of the window 2002 in the room 2003 are limited, the light is reflected in the horizontal direction by the light-reflective ceiling material 2003A and the interior of the room 2003 is moved to the back of the room. It can be reflected toward.

The daylighting apparatus 2010 is used as a part of the illumination dimming system in the room 2003. The lighting dimming system includes, for example, a lighting device 2010, a plurality of indoor lighting devices 2007, a solar radiation adjusting device 2008 installed in a window, a control system thereof, and a light-reflective ceiling material 2003A installed on a ceiling 2003a. And the constituent members of the entire room including

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

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 device 2010 constitute an entire lighting system of the room 2003.

As shown in FIGS. 34 and 35, for example, the ceiling length _{L 1} in the left-right direction (Y-direction) is 18m, the length _{L 2} in the depth direction of the room 2003 (X direction) of the office 9m windows 2002 2003a Indicates. 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 fixture 2007a is configured by integrating the brightness detection unit 2007b and the control unit 2007c. It 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 detector 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 for each 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. 36 is a graph showing the relationship between the illuminance of light (natural light) taken indoors by the daylighting device and the illuminance (illumination dimming system) by the indoor lighting device. In FIG. 36, 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 the figure indicates the target illuminance in the room. (●: Illuminance by lighting device, △: Illuminance by indoor lighting device, ◇: Total illumination)
As shown in FIG. 36, the desk surface illuminance caused by the light collected by the lighting device 2010 is brighter in the vicinity of the window, and the effect becomes smaller as the distance from the window increases. In a room to which the daylighting device 2010 is applied, such an illuminance distribution in the back direction of the room is generated by natural daylighting from a window in the daytime. Therefore, the daylighting device 2010 is used in combination with the indoor lighting device 2007 that compensates for the illuminance distribution in the room. The indoor lighting device 2007 installed on the indoor ceiling detects the average illuminance below each device by the brightness detection unit 2007b, and is dimmed and controlled so that the desk surface illuminance of the entire room becomes a constant target illuminance L0. Lights up. Therefore, the S1 and S2 rows installed in the vicinity of the window are hardly lit, and are lit while increasing the output toward the back of the room with the S3, S4, and S5 rows. As a result, the desk surface of the room is illuminated by the sum of the illuminance by natural lighting and the illumination by the room lighting device 2007, and the illuminance of the desk surface is 750 lx (“JIS Z9110 illumination” which is sufficient for work throughout the room. "Recommended maintenance illuminance in the office of" General "" can be realized.

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

Some aspects of the present invention include daylighting slats in which the bending of the central portion in the longitudinal direction is suppressed, and the use of such daylighting slats allows outdoor natural light (sunlight) to be efficiently taken indoors. The present invention can be applied to a daylighting slat and a daylighting device that need to make a person feel bright up to the interior without feeling dazzling.

1, 30, 45, 60, 70, 80 ... Blind (lighting device), 2 ... Slat, 3 ... Support mechanism, 4, 4A, 4B, 4C, 4D, 4E, 24, 24A, 24B, 34, 44, 54 , 64, 74, 84, 94 ... daylighting slats, 8, 9 ... notches, 12 ... ladder code, 25 ... light diffusion layer, 26 ... light diffusion film (prism structure), 41, 61, 71, 81, 91 ... base material, 41A, 71A ... first surface, 41B, 71B ... second surface, 42, 42B, 42C, 42D ... daylighting part, 43 ... gap, 41Aa ... first region, 41Ab ... second region, 41Ac ... 3rd area | region, 2010 ... Daylighting device, C1 ... 1st bending part, C2 ... 2nd bending part, C11, C21 ... Bending part, W1, W2 ... Width

Claims (15)

1. A substrate having a plurality of bent portions in a cross section perpendicular to the longitudinal direction and having light transmittance;
   A plurality of daylighting portions having light transmission provided on at least a part of the first surface of the substrate;
   A gap provided between the plurality of daylighting units,
   A daylighting slat having a function of reflecting light incident on the daylighting unit.
2. The base material includes a first region located on one side with respect to a first bent portion of the plurality of bent portions, and a second region located on the other side,
   The width of the first region is wider than the width of the second region,
   The daylighting slat according to claim 1, wherein the plurality of daylighting units are provided on at least a part of the first surface of the first region.
3. The daylighting slat according to claim 2, wherein the plurality of daylighting units are provided in the second region.
4. A third region located on a side opposite to the first region with respect to a second bent portion of the plurality of bent portions;
   The lighting slat according to claim 2, wherein a width of the first region is wider than a width of the third region.
5. The daylighting slat according to claim 4, wherein the plurality of daylighting units are provided in the third region.
6. The daylighting slat according to claim 2 or 4, wherein the second region and the third region are bent on the same side with respect to the first region.
7. The daylighting slat according to claim 3, wherein the second region and the third region are bent to opposite sides with respect to the first region.
8. The daylighting slat according to claim 3, wherein a notch for storing a ladder code is provided in at least one of the second region and the third region.
9. 4. In a cross section perpendicular to the longitudinal direction, at least one of an angle formed by the first region and the second region and an angle formed by the first region and the third region is larger than 90 °. A daylighting slat according to claim 1.
10. The daylighting slat according to claim 7, wherein at least one of the second region and the third region has light absorptivity.
11. 4. At least one of an angle formed between the first region and the second region and an angle formed between the first region and the third region in a cross section perpendicular to the longitudinal direction is smaller than 90 °. A daylighting slat according to claim 1.
12. The daylighting slat according to claim 9, wherein at least one of the second region and the third region has light reflectivity.
13. The daylighting slat according to claim 1, further comprising a light diffusion layer provided on at least a part of the second surface of the base material.
14. The daylighting slat according to claim 1, further comprising a prism structure provided on at least a part of the second surface of the substrate.
15. Multiple slats,
    A support mechanism for supporting the plurality of slats in a vertically suspended manner while connecting the plurality of slats with the longitudinal direction of the slats oriented horizontally.
    With
    A daylighting apparatus, wherein at least a part of the plurality of slats is constituted by the daylighting slats according to any one of claims 1 to 12.

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