JP2016118608A - Daylighting device and daylighting system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a daylighting device which is configured with a plurality of light diffusion sheets and yet is capable of effectively suppressing glare light and securing a bright indoor environment making sufficient use of natural light, and to provide a daylighting system.SOLUTION: A daylighting device of the present invention includes an optical sheet having a daylighting sheet comprising a light transmissive first base material and a plurality of light transmissive daylighting parts provided on a first surface of the first base material, and a plurality of light diffusion sheets provided on a side of either the first surface or a second surface opposite to the first surface of the first base material, where a gap between adjacent light diffusion sheets has a shape other than a continuous straight line that extends in a direction perpendicular to an extending direction of the daylighting parts from one end to another of the daylighting sheet.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a lighting device and a lighting system.

  Conventionally, it has been proposed to use a daylighting sheet as a technique for efficiently taking outdoor light (sunlight) indoors through a window glass or the like.

  The daylighting sheet is one in which a daylighting section composed of a plurality of prism bodies is formed on one surface of a light-transmitting film substrate. The daylighting sheet is affixed to the window glass to irradiate the light incident on the window glass toward the indoor ceiling, side walls, floor, etc. while changing the traveling direction of the light with the prism body. Moreover, since the light which goes to a ceiling reflects on a ceiling and illuminates a room, it becomes a substitute for illumination light. Therefore, when such a daylighting sheet is used, an energy saving effect that saves energy consumed by lighting equipment in the building during the day can be expected.

  However, depending on the latitude, azimuth of the window, or solar altitude, lighting on the ceiling may be reduced, or light may be distributed to the eyes of people in the room, causing unpleasant glare. is there. In the following description, light in which a person in the room feels dazzling is called glare light.

  In order to suppress the emission light from the daylighting sheet from becoming glare, a daylighting apparatus in which a light diffusion sheet is laminated on the daylighting sheet has been proposed (Patent Document 1). It is possible to suppress glare light by diffusing the glare light emitted from the daylighting sheet and directed toward the eyes of a person in the room by the light diffusion sheet.

JP2013-156554A

  However, when the daylighting device is enlarged to accommodate a large window, it is necessary to provide a plurality of regular light diffusing sheets for the large daylighting sheet. Depending on the tiling method of the light diffusion sheet, the light leaks through the boundary portion between the light diffusion sheets without being diffused. There is a problem that such light becomes intense glare light, which causes discomfort to people in the room.

  One aspect of the present invention has been made in view of the above-described problems of the prior art, and effectively suppresses glare light even in a configuration using a plurality of light diffusing sheets. ) Is fully utilized to provide a daylighting apparatus and a daylighting system that can ensure a bright indoor environment.

  A daylighting apparatus according to an aspect of the present invention includes a daylighting sheet having a first base material having light permeability and a plurality of daylighting parts having light permeability provided on a first surface of the first base material. And a plurality of light diffusion sheets provided on either one of the first surface of the first base material and the second surface opposite to the first surface. The daylighting unit has a reflection surface that reflects light incident on the daylighting unit, and the light reflected by the reflection surface and emitted from the second surface of the first base material is the first surface. Of the two spaces having a virtual plane as a boundary perpendicular to two surfaces and parallel to the extending direction of the daylighting section, the light travels toward the space on the same side as the light incident side on the reflecting surface. The gap between adjacent light diffusion sheets is in a direction perpendicular to the extending direction of the daylighting unit. Characterized in that a shape other than a straight line that is continuous from one end of the lighting sheet.

  In the daylighting apparatus according to one aspect of the present invention, the gap may be configured to extend obliquely with respect to a direction perpendicular to the extending direction of the daylighting unit.

  In the daylighting device according to one aspect of the present invention, the light diffusion sheet has anisotropy in the light diffusion direction, and in a direction intersecting the arrangement direction rather than the arrangement direction of the two spaces. It may be configured to strongly diffuse the light.

  In the daylighting device according to one aspect of the present invention, the first surface is opposite to the daylighting region further provided with a transparent base material and having the same function as the daylighting sheet on the first surface side of the transparent base material. It is good also as a structure by which the light-diffusion area | region provided with the function similar to the said light-diffusion sheet is provided in the 2nd surface side of the side.

  In the daylighting apparatus according to one aspect of the present invention, the gap formed by the plurality of light diffusion sheets and a flat surface between adjacent light diffusion sheets on the second surface of the first base of the daylighting sheet. It is good also as a structure which has these.

  In the daylighting apparatus according to one aspect of the present invention, the light diffusion sheet may be arranged on the light incident side of the daylighting sheet.

  In the daylighting apparatus according to one aspect of the present invention, the plurality of daylighting units may extend at an angle with respect to one side of the daylighting sheet.

  The lighting device in one aspect of the present invention includes a first base material having light permeability, and a plurality of lighting areas and adjacent lighting areas are arranged on the first surface side of the first base material. And an optical sheet provided with a light diffusing region positioned therebetween, and provided in the light diffusing region with respect to the extending direction of the plurality of first light-transmitting portions provided in the daylighting region. The extending direction of the plurality of second daylighting units is inclined, and the daylighting unit has a reflection surface that reflects light incident on the daylighting unit, and is reflected by the reflection surface to reflect the first base. Light emitted from the second surface of the material is incident on the reflecting surface in two spaces having a virtual plane as a boundary perpendicular to the second surface and parallel to the extending direction of the daylighting unit. It has a characteristic of proceeding toward a space on the same side as the side to perform.

  The daylighting apparatus according to one aspect of the present invention may include a daylighting screen and a winding mechanism that freely winds the daylighting screen, and the optical sheet may be used as the daylighting screen.

  A lighting device according to one aspect of the present invention, comprising: a plurality of slats arranged side by side with a predetermined interval in a short direction; and a tilting mechanism that tiltably supports the plurality of slats, The slat may have a configuration including the optical sheet.

  In the daylighting device according to one aspect of the present invention, the gaps between the slats adjacent in the arrangement direction of the plurality of slats may be shifted from each other.

  The daylighting device according to one aspect of the present invention further includes a first substrate having optical transparency, and a second substrate having optical transparency disposed to face the first substrate, and the first substrate and the It is good also as a structure by which at least one part of the said optical sheet is arrange | positioned between the 2nd board | substrates or the outer side.

  A daylighting system according to one aspect of the present invention includes a daylighting device, an indoor lighting device, a detection unit that detects indoor brightness, and a control unit that controls the indoor lighting device and the detection unit. The above-described daylighting device is adopted as the daylighting device.

  As described above, according to one aspect of the present invention, glare light is effectively suppressed even in a configuration using a plurality of light diffusion sheets, and natural light (sunlight) is sufficiently utilized to indoors. A daylighting device and a daylighting system that can ensure a bright environment can be provided.

The top view which shows the external appearance of the lighting apparatus of the state installed in the window. Sectional drawing which follows the A-A 'line of FIG. (A) is a perspective view which shows the structure of a daylighting sheet | seat, (B) is sectional drawing which shows the shape of a daylighting part. The perspective view which shows schematic structure of an anisotropic light-diffusion sheet. The perspective view which shows the bonding state of the anisotropic diffusion sheet with respect to the 2nd glass substrate. The perspective view which shows the bonding state of an anisotropic light-diffusion sheet and a 2nd glass substrate. (A) is a figure for demonstrating the manufacturing method of a daylighting sheet, (B) is a figure for demonstrating the manufacturing method of an anisotropic light-diffusion sheet. The schematic diagram which shows an example of a room model. The incident angle theta _IN of the incident light L _IN entering the lighting sheet, diagram explaining the definition of the exit angle theta _OUT of emitted light L _OUT emitted from lighting sheet. The figure for demonstrating the optical characteristic of the daylighting apparatus of 1st Embodiment. The figure for demonstrating the optical characteristic of the daylighting apparatus of 1st Embodiment. (A) is a figure which shows a mode that the daylighting sheet was seen from the indoor side, (B) is sectional drawing which follows the B-B 'line of (A). (A) is a figure which shows the lighting device which has arrange | positioned the light-diffusion sheet | seat on the light emission side of a lighting sheet as the comparative example 1, (B) is sectional drawing which follows the C-C 'line | wire of (A). (A) is a figure which shows a mode that the lighting apparatus as the comparative example 2 was seen from the indoor side, (B) is sectional drawing which follows the D-D 'line | wire of (A). The figure which shows a mode that the lighting apparatus in 1st Embodiment was seen from the indoor side. (A)-(D) are figures which show the modification of an anisotropic light-diffusion sheet. It is a figure which shows schematic structure of the lighting device in 2nd Embodiment, Comprising: (A) is a front view, (B) is sectional drawing. (A) is sectional drawing which shows schematic structure of the lighting device in 3rd Embodiment, (B) is a front view which shows the structure by the side of the light diffusion surface of the optical sheet in 3rd Embodiment. It is a figure which shows the structure of the original fabric roll used as an optical sheet, Comprising: (A) is a figure which shows original fabric roll itself, (B) is the figure seen from the lighting surface side of the original fabric roll shown to (A). (C) is the figure seen from the anisotropic light-diffusion surface side of the original fabric roll shown to (A). It is a figure which shows schematic structure of the lighting device in 4th Embodiment, Comprising: (A) is a front view, (B) is sectional drawing. The figure which shows the optical characteristic of the daylighting apparatus in 4th Embodiment. The figure which shows schematic structure of the blind in 5th Embodiment. Sectional drawing which shows schematic structure of the lighting slat which comprises the blind of 5th Embodiment. (A) is a figure which shows the optical characteristic in the whole blind, (B) is a figure which shows the optical characteristic of a lighting slat. The figure which shows schematic structure of the blind which is an example of the daylighting apparatus in 6th Embodiment. Sectional drawing which shows schematic structure of the lighting slat in 6th Embodiment. The figure which shows the tiling clearance gap by the two light-diffusion sheet | seats in 6th Embodiment. It is a figure which shows schematic structure of the roll screen in 7th Embodiment, (A) is a whole structure figure, (B) is a disassembled perspective view of a lighting screen. It is sectional drawing which shows schematic structure of a lighting sheet, Comprising: Sectional drawing which follows the F-F 'line | wire of FIG. Sectional drawing which shows schematic structure of the multilayer glass in 8th Embodiment type | system | group. The figure which shows the tiling state of the two anisotropic light-diffusion sheets used for 8th Embodiment. The figure which shows the modification of the multilayer glass in 8th Embodiment. The figure which shows the modification of the multilayer glass in 8th Embodiment. The front view which shows schematic structure of the lighting sheet of the lighting apparatus in 9th Embodiment. The figure which shows the main structural members of the lighting apparatus in 9th Embodiment. The front view which shows schematic structure of the lighting sheet of the lighting apparatus in 10th Embodiment. The figure which shows the main structural members of the daylighting apparatus in 10th Embodiment. The figure which shows the optical characteristic of the daylighting apparatus in 10th Embodiment. It is a room model provided with the lighting apparatus and the illumination light control system, Comprising: Sectional drawing which follows the J-J 'line | wire of FIG. 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 daylighting apparatus 1 shown in FIG. 1 will be described as a first embodiment of the present invention.
FIG. 1 is a plan view showing an external appearance of a daylighting apparatus installed in a window. FIG. 2 is a cross-sectional view taken along the line AA ′ of FIG. FIG. 3A is a perspective view showing the structure of the daylighting sheet, and FIG. 3B is a cross-sectional view showing the shape of the daylighting section. FIG. 4 is a perspective view showing a schematic configuration of the anisotropic light diffusion sheet. FIG. 5 is a perspective view showing a bonded state of the anisotropic diffusion sheet to the second glass substrate.

As shown in FIGS. 1 and 2, the daylighting apparatus 1 includes a daylighting unit 10 including an optical sheet and a pair of mounting portions 11 and 11.
As illustrated in FIG. 2, the daylighting unit 10 includes a daylighting sheet 12, a first glass substrate (first substrate) 17 that holds the daylighting sheet 12, a plurality of anisotropic light diffusion sheets (light diffusion sheets) 9, and a plurality of daylighting units 10. The second glass substrate (second substrate) 18 that holds the anisotropic light diffusion sheet 9 and a frame (support member) 13 that supports the plurality of components. In the present embodiment, the spacer 7 is disposed between the first glass substrate 17 and the second glass substrate 18.
The daylighting sheet 12 and the anisotropic light diffusion sheet 9 correspond to the optical sheet in the claims of the present invention.

  As shown in FIG. 3 (A), the daylighting sheet 12 includes a first base member 2 having optical transparency and a plurality of daylighting units having optical transparency provided on the first surface 2a of the first base member 2. 3 and a gap 4 provided between the plurality of daylighting units 3.

  The first substrate 2 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. 90% or more of the total light transmittance of the 1st base material 2 is preferable by prescription | regulation of JISK7361-1. Thereby, sufficient transparency can be obtained.

  The daylighting unit 3 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. 90% or more of the total light transmittance of the lighting part 3 is preferable by prescription | regulation of JISK7361-1. Thereby, sufficient transparency can be obtained.

  The plurality of daylighting units 3 extend in the longitudinal direction (length direction) of the first base material 2 and the short side direction (width direction) of the first base material 2 as shown in FIG. It is provided side by side. Each daylighting section 3 constitutes a prism body having a polygonal cross section as shown in FIG. The daylighting unit 3 has, for example, a hexagonal shape having six apexes in a cross-sectional shape orthogonal to the longitudinal direction, and all inner angles thereof being less than 180 °. Of the surfaces 3A to 3F of the daylighting unit 3, the surfaces 3D, 3E, and 3F positioned below the plane M perpendicular to the surface 3A passing through the top q reflect the light incident from the surfaces 3B and 3C. It functions as a reflective surface.

  Here, since the space between the adjacent daylighting parts 3 is a gap 4 and air is present, the gap 4 becomes an interface with the air. 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 3 is maximized when air is present rather than when any low refractive index material is present outside.

  It is desirable that the refractive index of the first base material 2 and the refractive index of the daylighting unit 3 are substantially equal. The reason is that, for example, when the refractive index of the first base material 2 and the refractive index of the daylighting unit 3 are significantly different, when light enters the first base material 2 from the daylighting unit 3, Unnecessary light refraction or reflection may occur at the interface with the substrate 2. In this case, there is a possibility that problems such as failure to obtain desired lighting characteristics or a decrease in luminance may occur.

  Such a daylighting sheet 12 is bonded to one side of the first glass substrate 17. The first glass substrate 17 and the daylighting sheet 12 are bonded to each other via an adhesive layer (not shown) provided on the light emission side of the daylighting sheet 12.

  As shown in FIG. 4, the anisotropic light diffusion sheet 9 has a streak-like fine shape including a plurality of convex portions 97 extending in one direction on the one surface 96 a side of the support base 96. The anisotropic light diffusing sheet 9 has a so-called pseudo-stripe structure in which convex portions 97 extending substantially in the lateral direction (Z direction) are arranged in the longitudinal direction (Y direction) of the support base 96.

  As described above, the anisotropic light diffusion sheet 9 has light diffusibility in the direction perpendicular to the extending direction of the convex portion 97 (Y direction) and in the direction parallel to the extending direction of the convex portion 97 (Z direction). It has optical properties that do not have much light diffusibility. In the following description, a direction with high light diffusivity is defined as a high light diffusion direction (Y direction), and a direction with low light diffusivity is defined as a low light diffusion direction (Z direction).

  In the present embodiment, the anisotropic light diffusion sheet 9 has the pseudo stripe structure described above, but may have a lenticular lens structure, for example.

  In the present embodiment, the anisotropic light diffusion sheet (light diffusion sheet) 9 includes two anisotropic light diffusion sheets 9 </ b> A and 9 </ b> B shown in FIG. 5, and these are bonded to one surface of the second glass substrate 18. The anisotropic light diffusion sheets 9 </ b> A and 9 </ b> B are provided side by side in the longitudinal direction of the second glass substrate 18. The high light diffusion directions (Y direction) of the anisotropic light diffusion sheets 9A and 9B indicated by the solid line arrows in the figure coincide with each other. The anisotropic light diffusion sheets 9A and 9B are bonded to the second glass substrate 18 with a slight gap Wt provided between them.

  As shown in FIG. 2, the anisotropic light diffusion sheets 9A and 9B and the second glass substrate 18 are attached to each other via an adhesive layer (not shown) provided on the light emission side of each anisotropic light diffusion sheet 9A and 9B. Are combined.

  The first glass substrate 17 having the daylighting sheet 12 and the second glass substrate 18 having the two anisotropic light diffusion sheets 9A and 9B are maintained at a distance by the spacer 7 disposed therebetween. The spacer 7 may have a function as a buffer material.

  The frame 13 shown in FIGS. 1 and 2 is made of an aluminum frame, and surrounds the first glass substrate 17 having the daylighting sheet 12 and the second glass substrate having the plurality of anisotropic light diffusion sheets 9. These are held in a flat state.

  The daylighting unit 10 having such a configuration is installed in a state of being suspended from the upper part of the window by the mounting portion 11. 1 and 2, reference numeral 1003 represents a window glass, reference numeral 108 represents a window sash, and reference numeral 109 represents a window frame.

  As shown in FIG. 2, each mounting portion 11 includes an attachment member 15 for attaching the lighting unit 10 to a window frame (attachment) 109 and a plurality of attachment screws 16. The attachment member 15 is made of stainless steel, and exhibits an L-shape in cross-section by a frame attachment portion 15A and a window frame attachment portion 15B that are connected in a vertical posture. The attachment member 15 is fixed to the frame 13 and the window frame 109 by screwing attachment screws 16 into screw holes formed in the frame attachment portion 15A and the window frame attachment portion 15B. The shape of the attachment member 15 is not limited to that described above.

  In this way, the daylighting unit 10 is mounted on the window frame 109 via the mounting portion 11. In the mounted state, the fine structure surface 3 a of the daylighting sheet 12 is in a posture facing the window glass 1003.

Next, the characteristic part of the lighting device 1 in this embodiment is demonstrated in detail.
FIG. 6 is a perspective view showing a bonded state of the anisotropic light diffusion sheet and the second glass substrate.
The daylighting apparatus 1 according to this embodiment includes the two anisotropic light diffusion sheets 9A and 9B described above.

  The anisotropic light diffusing sheets 9A and 9B are provided side by side in the longitudinal direction of the second glass substrate 18 as shown in FIG. The anisotropic light diffusing sheets 9 and 9 each have a high light diffusion direction (Y direction: solid line arrow) parallel to the longitudinal direction of the second glass substrate 18 and a low light diffusion direction (Z direction: dotted arrow). 18 are arranged in parallel to the short direction.

  These anisotropic light diffusing sheets 9A and 9B have a substantially trapezoidal shape when viewed from the normal direction, and have a shape in which the inclined side 9a is inclined at a predetermined angle α with respect to one side 9b in the longitudinal direction. It has become. The anisotropic light diffusing sheets 9A and 9B are arranged such that the inclined sides 9a and 9a are opposed to each other, and a gap Wt having a certain width is provided between the inclined sides 9a and 9a.

  Usually, when tiling a plurality of anisotropic light diffusing sheets 9 on the large second glass substrate 18, the rise of the boundary due to the thermal expansion of the anisotropic light diffusing sheets 9 and 9 due to the irradiation of sunlight is taken into consideration. Thus, it is necessary to provide a gap of about 1 mm between the two.

Here, the anisotropic light-diffusing sheet 9A exhibiting trapezoidal, the length _{L y} of each long side 9c of 9B, is approximately 900 mm. Further, as the first glass substrate 17 and the second glass substrate 18, glass plates having a plate thickness of about 3 mm are used. The length L _Y in the longitudinal direction of the second glass substrate 18 is approximately 1500 mm, and the length L _Z in the lateral direction is approximately 700 mm.
The first glass substrate 17 has the same size, and the daylighting sheet 12 described above also has the same size.

FIG. 7A is a diagram for explaining a method for manufacturing the daylighting sheet 12, and FIG. 7B is a diagram for explaining a method for manufacturing the anisotropic light diffusion sheet 9.
As shown in FIG. 7A, the daylighting sheet 12 in the present embodiment unwinds the raw roll 21 manufactured using the roll-to-roll method from the winding roller 22, and the daylighting sheet forming region R1. It was obtained by cutting every time. Therefore, the roll width W _R1 original fabric roll 21 is in the length L _Z in the lateral direction of the lighting sheet 12. Lighting sheet-forming regions R1 unwound from the winding roller 22, corresponds to the length L _Y in the longitudinal direction of the lighting sheet 12.

  Moreover, since the lighting part 3 is formed along the length direction of the original fabric roll 21, the lighting part 3 extends in the longitudinal direction of the daylighting sheet 12 after cutting.

  According to the manufacturing method, the size of the daylighting sheet 12, specifically, the lateral width along the left-right direction of the window can be freely adjusted. Therefore, when the lighting device in the left-right direction of the window is enlarged, the large-sized daylighting sheet 12 can be created by changing the cut-out size of the original fabric roll 21.

On the other hand, in the anisotropic light diffusing sheet 9 as well, an anisotropic light diffusing sheet is formed by unwinding a raw roll 41 manufactured using a roll-to-roll method as shown in FIG. This is obtained by cutting each region R2. Therefore, the roll width W _R2 original fabric roll 41, has a length L _y in the longitudinal direction of the anisotropic light-diffusing sheet 9. As described above, the roll width _WR2 of the raw fabric roll 41 defines the lateral width of the anisotropic light diffusion sheet 9, which is often smaller than the lateral width of the daylighting device 1 along the left-right direction of the window glass. Therefore, when the daylighting apparatus is increased in size, it is necessary to provide a plurality of anisotropic light diffusion sheets 9 side by side in the lateral direction (Y direction) of the daylighting apparatus 1.

Further, since the plurality of protrusions 97 along the length of the original fabric roll 41 is extended, the convex portion 97 along the length L _Z in the lateral direction of the anisotropic light-diffusing sheet 9 after cutting Will be extended.

  Furthermore, the anisotropic light diffusion sheet 9 of the present embodiment has the inclined side 9a that is inclined as described above. Therefore, after the raw fabric roll 41 is cut for each anisotropic light diffusing sheet forming region R2, the anisotropic light diffusing sheet 9 of this embodiment is obtained by further cutting a part of the singulated sheet 94 obliquely.

  According to the said manufacturing method, the magnitude | size of the anisotropic light-diffusion sheet 9, specifically, the vertical width along the up-down direction of a window, can be adjusted freely. On the other hand, since the width of the anisotropic light diffusion sheet 9 along the left-right direction of the window depends on the roll width of the original fabric roll 41, it is difficult to freely adjust. Therefore, when the daylighting apparatus is enlarged in the left-right direction of the window, a plurality of fixed anisotropic light diffusion sheets 9 are used side by side.

  Next, the daylighting characteristics of the daylighting apparatus 1 will be described using the room model 1000 shown in FIG. FIG. 8 is a schematic diagram showing an example of the room model 1000.

  The room model 1000 is a model that assumes use of the daylighting apparatus 1 in an office, for example. Specifically, a room model 1000 shown in FIG. 8 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. 1006 illustrates a case where outdoor light L is incident obliquely from above through the window glass 1003. The daylighting apparatus 1 is installed in a window frame (not shown) inside the window glass 1003.

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

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

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

  The daylighting apparatus 1 has a function of causing the external light L to travel toward the ceiling 1001. The light L traveling toward the ceiling 1001 becomes light L ′ that is reflected by the ceiling 1001 and irradiates the room, and serves as a substitute for illumination. However, in practice, the light L ′ that has passed through the daylighting apparatus 1 not only travels toward the ceiling 1001 but also travels toward the side wall 1005 or the floor 1002.

  At this time, the light that has passed through the daylighting apparatus 1 also includes light L5 and L6 that are directed to the position of the eyes of a person who is indoors. Such light makes a person who is indoors feel dazzling. In the room model 1000, a glare area G is an area that makes a person who is indoors feel dazzling. The range of the glare region G is defined based on the above-described region of human movement and the position of the human eye. The glare area G is an area of, for example, 0.8 m to 1.8 m from the floor 1002 at a position 1 m away from the side wall 1004.

(Definition of incident angle and exit angle)
Next, the definition of the incident angle θ _IN of the incident light _LIN incident on the lighting device 1 and the emission angle θ _OUT of the emitted light L _OUT emitted from the lighting device 1 will be described with reference to FIG.
Exit angle theta _OUT of the incident angle theta _IN and exit light _{L OUT} of the incident light _{L IN,} as shown in FIG. 9, the lighting device 1 normal to the direction of along the (first substrate 2 of the lighting sheet 12) The angle is defined as 0 °, the angle toward the ceiling 1001 is defined as positive (+), and the angle toward the floor 1002 is defined as negative (−).

In lighting device 1 of the present embodiment, the incident angle theta _IN of the incident light L _IN entering each lighting unit 3 of at least daylight sheet 12, 20 ° ≦ θ _IN ≦ 50 in ° to the normal daylight sheet 12 when in range, lighting sheet 12 exit angle theta _OUT of the output light L emitted from the same side (+ side) to 0 ° ≦ θ _OUT ≦ 15 and the incident light _{L iN} with respect to the normal daylight sheet 12 in ° scope, it is set so that the luminance of the emitted light L _OUT is relatively high.

  As a result, of the light L incident on the room 1006 through the daylighting apparatus 1 and the window glass 1003, the luminance of the light toward the ceiling 1001 is relatively reduced while the luminance of the light toward the glare region G and the light toward the floor 1002 is reduced. It is possible to increase it. That is, the light L incident on the room 1006 through the daylighting apparatus 1 and the window glass 1003 can be efficiently emitted toward the ceiling 1001. Further, the light L toward the ceiling 1001 can be irradiated to the back of the room 1006 without causing the people Ma and Mb in the room 1006 to feel dazzling.

  Furthermore, the light L ′ reflected by the ceiling 1001 illuminates the room 1006 brightly over a wide range, instead of illumination light. In this case, by turning off the lighting equipment in the room 1006, an energy saving effect that saves the energy consumed by the lighting equipment in the room 1006 during the day can be expected.

Next, optical characteristics in the daylighting apparatus 1 of the present embodiment described above will be described.
10 and 11 are diagrams for explaining the optical characteristics of the daylighting apparatus according to the first embodiment.
As shown in FIG. 10, the light that directly reaches from the sun first passes through the window glass 1003, enters the daylighting sheet 12 of the daylighting device 1, and is reflected obliquely upward on the reflecting surface of the daylighting unit 3. Then, the light enters the anisotropic light diffusion sheet 9. The light emitted from the daylighting sheet 12 is anisotropically diffused in the anisotropic light diffusing sheet 9 in the horizontal direction, that is, in the extending direction of the daylighting unit 3, and then emitted toward the indoor ceiling.

  Here, for convenience of explanation, an incident point E is a point where any one light beam among the light incident on the daylighting unit 3 illustrated in FIG. 11 is incident on the surface 3E (reflection surface) of the daylighting unit 3. A virtual straight line passing through the incident point E and orthogonal to the first surface 2a of the first base material 2 is defined as a straight line f. Of the two spaces having a horizontal plane (virtual plane) including the straight line f as a boundary, the space on the side where the light L incident on the incident point E exists is defined as the first space S1, and the light L incident on the incident point E exists. The space on the side not to be used is defined as a second space S2.

For example, the light L incident from the surface 3C of the lighting unit 3 at a predetermined incident angle theta _IN is obliquely upward totally reflected by the surface 3E of the lighting part 3, i.e. the flow proceeds toward a side of the first space S1, lighting unit 3 from the surface 3A. The light L emitted from the daylighting unit 3 is transmitted through the first base material 2, enters the anisotropic light diffusion sheet 9, and is emitted indoors while being diffused in the horizontal direction. The light emitted from the daylighting apparatus 1 toward the ceiling at a predetermined emission angle θ _OUT is reflected from the ceiling and illuminates the room, and thus is a substitute for illumination light. Therefore, when such a daylighting apparatus 1 is used, the energy saving effect which saves the energy which the lighting installation in a building consumes during the day can be expected.

  As described above, the anisotropic light diffusing sheet 9 in the present embodiment has anisotropy in the light diffusion direction, and these are more than directions intersecting the extending direction of the plurality of daylighting sections 3 in the daylighting sheet 12. It has the characteristic of diffusing light strongly in the extending direction (horizontal direction) of the daylighting unit 3. That is, as illustrated in FIG. 11, two boundaries including the straight line f and having a virtual plane as a boundary perpendicular to the first surface 2 a of the first base material 2 in the daylighting sheet 12 and parallel to the extending direction of the daylighting unit 3. Light is diffused more strongly in the direction parallel to the direction intersecting the arrangement direction than the arrangement direction of the spaces S1 and S2. In such an anisotropic light diffusion sheet 9, the light can be collected while suppressing the luminance of the direct light by diffusing the light more strongly in the horizontal direction (X direction) than in the vertical direction (Y direction).

  FIG. 12A is a view showing the daylighting sheet as viewed from the indoor side, and FIG. 12B is a cross-sectional view taken along line B-B ′ of FIG. FIG. 13A is a view showing a daylighting device in which a light diffusion sheet is arranged on the light emission side of the daylighting sheet as Comparative Example 1, and FIG. 13B is a line CC ′ in FIG. It is sectional drawing which follows.

  As shown in FIGS. 12 (A) and 12 (B), sunlight transmitted through only the daylighting sheet 12 is diffused by the fine structure of the daylighting sheet 12 in the vertical direction, that is, in the direction intersecting the longitudinal direction of the daylighting unit 3. The At this time, since it is hardly diffused in the left-right direction of the daylighting sheet 12, the glare light is extended in the up-down direction at a position connecting the sun and the line of sight. Due to the characteristics of the daylighting sheet 12, the glare light appears as one vertical line and is visually recognized by a person in the room. Although the place where glare light appears on the daylighting sheet 12 changes depending on the positional relationship between the sun and a person, it is always visually recognized, which is uncomfortable for a person in the room.

  Therefore, conventionally, as shown in FIG. 13A, glare light is diffused by disposing a light diffusion sheet 19 on the light emission side of the daylighting sheet 12. As shown in FIG. 13B, the light emitted from the daylighting sheet 12 toward the glare region is diffused in the light diffusion sheet 19, thereby preventing light that is strong in the eyes of people in the room from entering. The

14A is a diagram showing a lighting device as Comparative Example 2 as viewed from the indoor side, and FIG. 14B is a cross-sectional view taken along the line DD ′ in FIG.
However, in order to obtain a large daylighting device, it is necessary to tile a plurality of light diffusion sheets 19 on a large glass substrate. In that case, as shown in FIG. 14 (A), a plurality of existing light diffusing sheets 19 having a rectangular shape in plan view are arranged side by side. As described above, when tiling a plurality of light diffusion sheets 19, it is necessary to provide a gap W at a boundary portion between the sheets in consideration of thermal expansion of the sheets.

  In particular, when using the light diffusion sheet 19 having anisotropy produced by roll-to-toll, the sheet size is likely to be restricted in the width direction (direction in which light diffusion is strong) as described above. Therefore, they are arranged along the longitudinal direction of the daylighting sheet 12, that is, along the extending direction of the daylighting unit 3. Then, a gap W between the light diffusion sheets 19 is formed along a direction orthogonal to the extending direction of the daylighting unit 3.

  Then, the light emitted from the daylighting sheet 12 leaks without being diffused from the gap W. As described above, the glare light emitted from the daylighting sheet 12 is generated as a vertical line in a direction perpendicular to the extending direction of the daylighting unit 3. Therefore, as shown in FIG. 14B, when there is a gap W in the same direction as the vertical line of the glare light between the tiled light diffusion sheets 19, the light transmitted through the gap W is intense glare light. It will be uncomfortable for people in the room.

FIG. 15 is a diagram illustrating a lighting device according to the first embodiment as viewed from the indoor side.
In the daylighting apparatus 1 of the present embodiment, two anisotropic light diffusion sheets 9A and 9B are provided along the lateral width of the daylighting sheet 12, as shown in FIG. The gap Wt formed between the anisotropic light diffusion sheets 9A and 9B is inclined with respect to the vertical direction of the daylighting apparatus 1 and is perpendicular to the extending direction of the daylighting unit 3 of the daylighting sheet 12. It extends diagonally. Clearance Wt is the order of 1 mm, it is larger than the width _{W G} of the glare light LG extending width We.

  Since the glare light LG emitted from the daylighting sheet 12 appears as a vertical line, most of the glare light LG emitted from the daylighting sheet 12 passes through the anisotropic light diffusion sheets 9A and 9B and is emitted into the room. . Some glare light LG is emitted from the gap Wt without passing through the anisotropic light diffusing sheets 9A and 9B. It ’s not the light that makes people feel uncomfortable. Thereby, it is possible to greatly reduce the occurrence of intense glare light LG that has not been diffused into the room.

  In this way, the shapes of the adjacent anisotropic light diffusion sheets 9A and 9B are made different so that the gap Wt at the boundary portion of the anisotropic light diffusion sheets 9A and 9B extends in a direction intersecting the extending direction of the daylighting unit 3. By reducing the existing portion, it is possible to effectively reduce the glare light LG.

(Modified example of anisotropic light diffusion sheet)
Next, a modified example of the anisotropic light diffusion sheet will be described.
16 (A) to 16 (D) are diagrams showing modifications of the anisotropic light diffusion sheet.
Like the anisotropic light diffusing sheets 9A and 9B shown in FIG. 16A, the inclined sides 9a and 9a on the opposite sides may be formed in a curved shape. In this case, the gap Wt formed between them extends while drawing a curve in an oblique direction with respect to the vertical direction of the daylighting apparatus.

  Like the anisotropic light diffusion sheets 9A and 9B shown in FIG. 16 (B), the opposite sides of the inclined sides 9a and 9a may be shaped in a zigzag manner in the vertical direction of the daylighting device. Here, one inclined side 9a is cut into a V shape, and the other inclined side 9a is cut into a mountain shape. Therefore, the gap Wt formed between each other is formed in a bent line shape such that a straight line is bent.

  In addition, it is not restricted to the structure which has two anisotropic light diffusion sheets in the horizontal width direction of a lighting apparatus, You may use three or more anisotropic light diffusion sheets.

  As shown in FIG. 16C, three anisotropic light diffusion sheets 9A, 9B, 9C may be provided. Also in this case, a gap Wt extending obliquely with respect to the vertical direction of the daylighting device is formed between the anisotropic light diffusion sheets 9A, 9B, 9C.

  As shown in FIG. 16D, a large number of anisotropic diffusion sheets having a rectangular shape may be arranged. In this case, the sheets arranged vertically are shifted in the lateral width direction so that the ends of adjacent sheets in the vertical direction do not coincide with each other. Thereby, a staircase-shaped gap Wt is formed in the vertical direction of the daylighting device.

In any gap Wt shown in FIG. 16 (A) ~ (D) , extending the width in the Y direction We is greater than the width _{W G} of the glare light shown in FIG. 15.

[Second Embodiment]
Next, the structure of the lighting device in 2nd Embodiment is demonstrated.
The basic configuration of the daylighting apparatus of the present embodiment shown below is substantially the same as that of the first embodiment, but differs in that the daylighting sheet and the anisotropic light diffusion sheet are provided on the same substrate. Therefore, in the following description, a different part from previous embodiment is demonstrated in detail, and description of a common location is abbreviate | omitted. Moreover, in each drawing used for description, the same reference numerals are given to components common to FIGS.

FIG. 17 is a diagram illustrating a schematic configuration of a daylighting apparatus according to the second embodiment, in which (A) is a front view and (B) is a cross-sectional view.
As shown in FIGS. 17A and 17B, the daylighting device 20 in the present embodiment is mainly composed of a transparent base material 23, a daylighting sheet 12, and a pair of anisotropic light diffusion sheets 9A and 9B. As the transparent base material 23, for example, a glass substrate is used. The daylighting sheet 12 is provided on the first surface 23a of the transparent base material 23, and the anisotropic light diffusion sheets 9A and 9B are bonded to the second surface 23b. Such a daylighting device 20 is installed so that the daylighting sheet 12 side faces the window glass.

Also in the present embodiment, the gap Wt formed between the inclined sides 9a and 9a of the anisotropic light diffusing sheets 9A and 9B extends obliquely. Therefore, as in the previous embodiment, the glare light generated via the daylighting sheet 12 remains linear and is not emitted into the room, and is emitted as a point only from the intersection of the glare light and the gap Wt. Thereby, intense glare light that is not diffused can be greatly reduced.
In addition, since the number of glass substrates is one, the configuration can be simplified and the weight can be reduced.

[Third Embodiment]
Next, the configuration of the daylighting device in the third embodiment will be described.
The basic configuration of the daylighting device of this embodiment shown below is substantially the same as that of the first embodiment described above, but differs in that an optical sheet having both the daylighting function and the light diffusion function is provided. Therefore, in the following description, a different part from previous embodiment is demonstrated in detail, and description of a common location is abbreviate | omitted. Moreover, in each drawing used for description, the same reference numerals are given to components common to FIGS.

FIG. 18A is a cross-sectional view showing a schematic configuration of a daylighting device in the third embodiment, and FIG. 18B is a front view showing a configuration on the light diffusion surface side of the optical sheet in the third embodiment. is there.
As shown in FIG. 18A, the daylighting device 30 of the third embodiment has an optical sheet 31 having a daylighting function on one side and a light diffusion function on the other side, and an optical structure formed on both sides. It has.

  The optical sheet 31 is provided with a daylighting region 33 having the same daylighting function as that of the daylighting sheet on the first surface 32a side of the base material 32, and similar to the anisotropic light diffusion sheet on the second side 32b side. A plurality of anisotropic light diffusion regions (light diffusion regions) 34 having a light diffusion function are provided.

  The daylighting region 33 is provided with a plurality of daylighting units 3 extending in the lateral width direction (Y direction) of the daylighting device 30. On the other hand, in the anisotropic light diffusion region 34, as shown in FIG. 18B, a plurality of convex portions 97 extending in the vertical direction (Z direction) of the daylighting device 30 are formed in a stripe shape. The optical sheet 31 of the present embodiment has a plurality of such anisotropic light diffusion regions 34. Between the anisotropic light diffusion regions 34, a flat surface 35 in which the second surface 32 b of the base material 32 is exposed is provided. The flat surface 35 extends obliquely with respect to the extending direction of each convex portion 97.

  Further, as the base material 32 of the optical sheet 31 described above, the first base material 2 constituting the daylighting sheet 12 described above may be used, and a plurality of anisotropic lights are formed on the second surface 2b of the first base material 2. The diffusion region 34 may be formed.

  In addition, as long as at least one part of the flat surface 35 has a part which does not become perpendicular | vertical with respect to the extending direction of the lighting part 3, it may not be linear form but another shape.

  19A and 19B are diagrams showing the configuration of the original fabric roll to be the optical sheet 31, wherein FIG. 19A is a diagram showing the original fabric roll itself, and FIG. 19B is a lighting surface of the original fabric roll shown in FIG. The figure seen from the side, (C) is the figure seen from the anisotropic light-diffusion surface side of the original fabric roll shown to (A).

  The optical sheet 31 described above is manufactured by processing both surfaces of the roll base 36 using a roll-to-roll method.

  However, since the extending direction of the daylighting portion 3 in the daylighting region 33 and the extending direction of the convex portion 97 in the anisotropic light diffusion region 34 are orthogonal to each other, it is difficult to form both continuously at the same time. Therefore, in this embodiment, the lighting area 33 side is continuously formed by roll-to-roll, and the anisotropic light diffusion area 34 side is formed by a mold. When a mold is used, a flat surface 35 is generated on the base material 32 in units of mold area. That is, the flat surface 35 inclined with respect to the short direction of the roll base material 36 is generated at the joint (gap) in the region where the many convex portions 97 are formed by the mold.

Thus, the optical sheet 31 is obtained by unwinding the original fabric roll 37 with the optical structure formed on both surfaces from the take-up roller 38 and cutting it for each optical sheet forming region R3.
As the roll base material 36, a base material made of a transparent resin material that is easy to process is used.

  According to the lighting device 30 of the present embodiment, it is possible to flexibly cope with an increase in the size of the lighting device. That is, if it is a manufacturing method as mentioned above, the lighting device of various magnitude | sizes can be easily formed by changing the cut-out magnitude | size of the original fabric roll 37. FIG. Moreover, since it can form by processing on both surfaces of a base material, each component can be integrally formed as an optical sheet, and it can be set as the single structure which does not have an adhesion part.

[Fourth Embodiment]
Next, the configuration of the daylighting device in the fourth embodiment will be described.
The basic configuration of the daylighting device of the present embodiment shown below is substantially the same as that of the first embodiment described above, but in the previous embodiment, the anisotropic light diffusion sheet 9 is arranged on the light emission side of the daylighting sheet 12. However, the present embodiment differs from the above-described configuration in that the anisotropic light diffusion sheet 9 is disposed on the light incident side of the daylighting sheet 12. Therefore, in the following description, a different part from previous embodiment is demonstrated in detail, and description of a common location is abbreviate | omitted. Moreover, in each drawing used for description, the same reference numerals are given to components common to FIGS.

FIG. 20 is a diagram illustrating a schematic configuration of a daylighting apparatus according to the fourth embodiment, in which (A) is a front view and (B) is a cross-sectional view.
As shown in FIGS. 20A and 20B, the daylighting device 40 in this embodiment includes a first glass substrate 17 having a daylighting sheet 12, and a second glass substrate 18 having anisotropic light diffusing sheets 9A and 9B. It is equipped with. The second glass substrate 18 is located on the light incident side of the daylighting sheet 12, and is disposed so that the anisotropic light diffusion sheets 9 </ b> A and 9 </ b> B face the daylighting sheet 12.

FIG. 21 is a diagram illustrating optical characteristics of the daylighting device according to the fourth embodiment.
According to the lighting device 40 having the above configuration, as shown in FIGS. 20B and 21, the sunlight transmitted through the second glass substrate 18 enters the anisotropic light diffusion sheets 9 </ b> A and 9 </ b> B and is scattered. And is emitted into the room through the daylighting sheet 12. On the other hand, of the sunlight, the light transmitted through the gap Wt between the anisotropic light diffusion sheets 9A and 9B enters the daylighting sheet 12 as it is and is emitted indoors in a scattered state.

  As described above, only a small amount of the light transmitted through the gap Wt between the anisotropic light diffusion sheets 9A and 9B out of the sunlight incident on the daylighting device 40. Since the light transmitted through the gap Wt is reflected or refracted by the daylighting sheet 12, intense glare light is not emitted into the room as it is. Therefore, also in the daylighting apparatus 40 of this embodiment, the same effect as each said embodiment is acquired, and the glare light inject | emitted indoors can be reduced significantly.

[Fifth Embodiment]
(blind)
Next, a blind which is an example of the daylighting device of the present invention as the fifth embodiment will be described.
FIG. 22 is a perspective view showing a schematic configuration of a blind according to the fifth embodiment. FIG. 23 is a cross-sectional view showing a schematic configuration of a daylighting slat constituting the blind according to the fifth embodiment. FIG. 24A shows the optical characteristics of the entire blind, and FIG. 24B shows the optical characteristics of the daylighting slats. In the following description, the same parts as those of the daylighting sheet and the anisotropic light diffusing sheet are not described, and the same reference numerals are given in the drawings.

  As shown in FIG. 22, the blind (lighting device) 50 includes a plurality of slats 52 arranged side by side at a predetermined interval, and a tilting mechanism (supporting mechanism) 53 that supports the plurality of slats 52 so as to be tiltable. And a storage mechanism 58 for folding and storing the plurality of slats 52 connected by the tilting mechanism 53 so as to be able to be put in and out.

  The plurality of slats 52 provided in the blind 50 include a daylighting unit 55 configured by a plurality of daylighting slats 56 having daylighting properties, and a plurality of light-blocking slats 59 having a light shielding property, which are positioned below the daylighting unit 55. And a light shielding portion 57 constituted by In the following description, the daylighting slat 56 and the light shielding slat 59 are collectively treated as the slat 52 unless otherwise distinguished.

  As shown in FIG. 23, the daylighting slat 56 includes a long plate-like slat base material 51 having light permeability, a daylighting sheet 12, and anisotropic light diffusion sheets 9A and 9B. The lighting sheet 12 is provided on one side and the anisotropic light diffusion sheets 9A and 9B are provided on the other side.

  Here, as each daylighting slat 56, the same structure as that of any daylighting apparatus in each of the embodiments described above can be adopted. However, the daylighting sheet 12 and the anisotropic light diffusion sheets 9A and 9B are different from the daylighting sheet 12 and the anisotropic light diffusion sheets 9A and 9B of the above-described embodiments in terms of the shape, size, thickness, and the like. It is the dimension suitable for.

  On the side facing the indoor side of the daylighting slat 56, there is a gap Wt extending obliquely between the anisotropic light diffusion sheets 9A and 9B. In the present embodiment, a single daylighting slat 56 includes two anisotropic light diffusion sheets 9A and 9B. However, the present invention is not limited to this. Depending on the dimensions of the daylighting slats 56, three or more light diffusion sheets may be provided, and there may be a plurality of oblique gaps Wt.

  The daylighting slat 56 is often configured with a longitudinal dimension of approximately 1000 mm or more. Therefore, in the case of configuring a slat including the anisotropic light diffusion sheet 9 that is easily limited by the lateral width size, a plurality of anisotropic light diffusion sheets 9 are tiled, and therefore the gap between the anisotropic light diffusion sheets 9A and 9B is determined. By making Wt oblique, it is possible to effectively reduce glare light.

  As shown in FIG. 24A, the blind 50 having the above-described configuration is used in a state of being suspended from the upper part of the window glass 1003 and facing the inner surface of the window glass 1003. At this time, the slats 52 are arranged in a direction in which the arrangement direction of the plurality of slats 52 matches the vertical direction (vertical direction) of the window glass 1003 with respect to the window glass 1003. The daylighting slats 52 are arranged so that the extending direction of each daylighting section 3 in the daylighting sheet 12 matches the horizontal direction (horizontal direction) of the windowpane 1003 with respect to the windowpane 1003.

  In the daylighting section 55 of the blind 50, as shown in FIGS. 24A and 24B, the sunlight L that has passed through the window glass 1003 is reflected obliquely upward by the daylighting sections 3 in the daylighting sheet 12, and the slat base material. Then, the light enters the anisotropic light diffusion sheets 9A and 9B. The light incident on these anisotropic light diffusion sheets 9A and 9B is scattered and emitted toward the indoor ceiling. On the other hand, the light transmitted through the gap Wt is emitted into the room as it is, but does not become intense glare light because it is emitted as a point at the intersection with the gap Wt.

  Further, as shown in FIG. 24A, the light shielding portion 57 shields the light L incident on the one surface of each light shielding slat 59 obliquely from the upper side by each light shielding slat 59. Since the light shielding unit 57 is located below the daylighting unit 55, it is possible to shield light mainly entering the glare region and light going to the floor out of the light L entering the room through the window glass 1003.

  Moreover, in the blind 50, the angle of the light L toward the ceiling can be adjusted by tilting the plurality of slats 52. Furthermore, light incident from between the plurality of slats 52 can be adjusted.

  As described above, the blind 50 according to the present embodiment can provide the same effects as those of the above embodiments, and the glare light emitted into the room through the blind 50 can be greatly reduced.

[Sixth Embodiment]
(blind)
Next, a blind that is an example of a daylighting apparatus according to the sixth embodiment will be described.
The basic configuration of the blind of this embodiment shown below is substantially the same as that of the fifth embodiment described above, but differs in that the gap extends in the vertical direction. Therefore, in the following description, a different part from previous embodiment is demonstrated in detail, and description of a common location is abbreviate | omitted. Moreover, in each drawing used for description, the same reference numerals are given to components common to FIGS.

  FIG. 25 is a diagram illustrating a schematic configuration of a blind that is an example of a daylighting apparatus according to the sixth embodiment. FIG. 26 is a cross-sectional view showing a schematic configuration of a daylighting slat in the sixth embodiment. FIG. 27 is a diagram illustrating a tiling gap between two light diffusion sheets in the sixth embodiment.

  As shown in FIG. 25, the blind (lighting device) 60 in the present embodiment includes a light shielding part 57 composed of the plurality of light shielding slats 59 and a light collecting part 55 composed of a plurality of daylighting slats 62. As shown in FIG. 26, the daylighting slat 62 includes the slat substrate 51 having light permeability, the daylighting sheet 12, and two anisotropic light diffusion sheets 9C and 9D having a rectangular shape in plan view. .

  As shown in FIG. 27, since each anisotropic light diffusion sheet 9C, 9D has a rectangular shape in plan view, the gap Wt between them extends vertically along the short direction of the slat.

  In most of the daylighting slats 62 constituting the daylighting unit 55, the sizes of the anisotropic light diffusion sheet 9C and the light diffusion sheet 9D are different from each other. In the present embodiment, the positions of the tiling gaps Wt of the anisotropic light diffusing sheets 9 </ b> C and 9 </ b> D do not coincide with each other in the width direction of the blind 60 in the daylighting slats 62 at each stage. In the present embodiment, the position of the gap Wt in the lower daylighting slat 62 is shifted to one side in the longitudinal direction of the slat (Y direction) with respect to the whole daylighting slat 62 constituting the daylighting unit 55. Yes.

  When the gap Wt between the lighting slats 62 adjacent in the vertical direction coincides in the width direction of the blind 60, the gap Wt draws a continuous straight line in the vertical direction. It will be injected into the room.

  On the other hand, in the present embodiment, the positions of the gaps Wt are all shifted in the width direction of the blind 60 so that the positions of the gaps Wt between all the daylighting slats 62 do not coincide. Thereby, since the glare light which draws a vertical line is emitted as a point in the gap Wt between the daylighting slats 62, it is not the light which makes the person in the room feel uncomfortable.

[Seventh Embodiment]
(Roll curtain)
Next, a roll screen which is an example of a daylighting apparatus of the present invention will be described as a seventh embodiment.
FIG. 28 is a diagram showing a schematic configuration of a roll screen in the seventh embodiment, where (A) is an overall structural view and (B) is an exploded perspective view of a daylighting screen. FIG. 29 is a cross-sectional view showing a schematic configuration of the daylighting sheet, and is a cross-sectional view taken along the line FF ′ of FIG. Moreover, in the following description, description about a part equivalent to the said lighting apparatus is abbreviate | omitted, and shall attach | subject the same code | symbol in drawing.

  As shown in FIGS. 28A and 28B, the roll screen (lighting device) 70 includes a daylighting screen 71 and a winding mechanism 76 that supports the daylighting screen 71 so as to be able to wind up.

  28B and 29, the daylighting screen 71 includes a daylighting sheet 72, a protective sheet 73 provided on the fine structure surface 72a side (light incident side) of the daylighting sheet 72, and the daylighting sheet 72. It is configured to include two anisotropic light diffusion sheets 74A and 74B provided on the other surface 72b side, and adopts external light.

  The daylighting sheet 72 and the anisotropic light diffusion sheets 74A and 74B can adopt the same structure as the daylighting sheet and the anisotropic light diffusion sheet in the above embodiment. However, the shape, size, thickness, and the like of the daylighting sheet 72 and the anisotropic light diffusion sheets 74A and 74B are different from the daylighting sheet and the anisotropic light diffusion sheet of the above-described embodiments, and are suitable for the roll screen 70. It is said that.

As shown in FIG. 28B, the gap Wt between the anisotropic light diffusing sheets 74A and 74B in the present embodiment extends obliquely in the vertical direction of the daylighting screen 71.
When the length W1 in the width direction (Y direction) of the daylighting screen 71 is 1.5 m and the length L _Z in the pulling direction (Z direction) is 0.6 m, each short side 74a of the anisotropic light diffusion sheets 74A and 74B. The length of each of the long sides 74b of the anisotropic light diffusion sheets 74A and 74B is 0.9 m. The gap Wt between the hypotenuses 74c and 74c of the anisotropic light diffusion sheets 7A and 7B is about 1 mm.

  As shown in FIG. 28A, the winding mechanism 76 includes a winding core (supporting member) 75 attached along the upper end portion of the daylighting screen 71 and a lower portion attached along the lower end portion of the daylighting screen 71. A pipe (support member) 79, a tension cord 77 attached to the center of the lower end of the daylighting screen 71, and a storage case 78 for storing the daylighting screen 71 wound around the winding core 75 are provided.

  The winding mechanism 76 is a pull cord type, and is fixed at the position where the daylighting screen 71 is pulled out, or by further pulling the pulling cord 77 from the position where it is pulled out, thereby releasing the fixing and placing the daylighting screen 71 on the core 75. It is possible to wind up automatically. The winding mechanism 76 is not limited to such a pull cord type, but may be a chain type winding mechanism that rotates the winding core 75 with a chain, an automatic winding mechanism that rotates the winding core 75 with a motor, or the like. There may be.

  As shown in FIG. 28A, the roll screen 70 having the above configuration pulls the daylighting screen 71 stored in the storage case 78 in a state where the storage case 78 is fixed to the upper part of the window glass 1003. It is used in a state where it is opposed to the inner surface of the window glass 1003 while being pulled out by the cord 77. At this time, the daylighting screen 71 is arranged in a direction in which the arrangement direction of the plurality of daylighting units 3 matches the vertical direction (vertical direction) of the window glass 1003 with respect to the window glass 1003. In other words, the daylighting screen 71 is arranged so that the longitudinal direction of the plurality of daylighting units 3 matches the horizontal direction (horizontal direction) of the window glass 1003 with respect to the window glass 1003.

  The daylighting screen 71 facing the inner surface of the window glass 1003 diffuses the light incident in the room through the window glass 1003 in the horizontal direction by the anisotropic light diffusion sheets 74C and 74D while changing the light traveling direction in the plurality of daylighting sections 3. Irradiate the ceiling toward the ceiling. The light directed to the ceiling is reflected by the ceiling and illuminates the room, and thus substitutes for illumination light.

  Further, the glare light emitted from the daylighting screen 71 is emitted into the room as a point at the intersection with the gap Wt between the anisotropic light diffusion sheets 74A and 74B. For this reason, it is not the light which the person who is indoors feels uncomfortable.

  Therefore, when such a roll screen 70 is used, the glare light can be reduced to improve the indoor environment, and the energy saving effect of saving the energy consumed by the lighting equipment in the building during the day can be expected.

[Eighth Embodiment]
(Multilayer glass)
Next, the multi-layer glass which is an example of the lighting apparatus in 8th Embodiment is demonstrated.
FIG. 30 is a cross-sectional view illustrating a schematic configuration of the multilayer glass in the eighth embodiment. FIG. 31 is a diagram illustrating a tiling state of two anisotropic light diffusion sheets used in the eighth embodiment. In the following description, the same parts as those of the daylighting sheet and the anisotropic light diffusing sheet are not described, and the same reference numerals are given in the drawings.

  As shown in FIG. 30, the multi-layer glass (lighting device) 80 according to the present embodiment is an example of a daylighting device that incorporates sunlight (external light) into a room while being incorporated in an indoor window frame, for example. It is.

  As shown in FIGS. 30 and 31, the double-glazed glass 80 is a window having a double-glazed glass structure (pair glass structure) mainly composed of a first glass substrate 81 and a second glass substrate 82 arranged to face each other. It is glass. A daylighting sheet 84 and anisotropic light diffusion sheets 85A and 85B are disposed in a hollow heat insulating layer (air layer) 83 formed between the first glass substrate 81 and the second glass substrate 82.

  The 1st glass substrate 81 and the 2nd glass substrate 82 consist of a glass substrate which has a light transmittance mutually. The first glass substrate 81 is disposed on the outdoor side, and the second glass substrate 82 is disposed on the indoor side. The first glass substrate 81 and the second glass substrate 82 are bonded to each other at their peripheral portions by a seal member 86. The gap between the first glass substrate 81 and the second glass substrate 82 is about 12 mm.

  As the glass substrates 81 and 82, in addition to the float glass used for normal windows, heat ray reflective glass or low emission (low-E) glass having an infrared reflective layer formed of a special metal film on the surface is used.

  The daylighting sheet 84 is attached to the inner surface 81a of the first glass substrate 81 on the hollow heat insulating layer 83 side. The anisotropic light diffusion sheets 85A and 85B are affixed to the inner surface 82a of the second glass substrate 82 that is on the hollow heat insulating layer 83 side. In the present embodiment, the microstructure surface 84A on which the daylighting section 3 of the daylighting sheet 84 is formed is configured to face the anisotropic light diffusion sheets 85A and 85B.

  The seal member 86 has a dual seal structure including a primary seal material and a secondary seal material. Even if the hollow heat insulating layer 83 formed between the first glass substrate 81 and the second glass substrate 82 is expanded by such a sealing member 5 due to an increase in temperature or a decrease in pressure in the surrounding atmosphere, the glass substrate The tensile stress of the adhesion part of 81 and 82 can be relieved. Therefore, the heat resistance performance of the multilayer glass structure is supported over a long period of time.

  In the present embodiment, the hollow heat insulating layer 83 is an air layer made of air. However, the hollow heat insulating layer 83 may be an inert gas layer made of an inert gas such as nitrogen and is in a reduced pressure state. It may be a reduced pressure layer.

  Also in the multilayer glass 80 of the present embodiment, the glare light can be reduced by the pair of anisotropic light diffusion sheets 85A and 85B, and therefore the same effects as those of the above embodiments can be obtained.

(Modification)
FIG.32 and FIG.33 is a figure which shows the modification of the multilayer glass in 8th Embodiment.
As shown in FIG. 32, anisotropic light diffusion sheets 85 </ b> A and 85 </ b> B may be disposed on the light incident side of the daylighting sheet 84. Specifically, the anisotropic light diffusion sheets 85A and 85B may be provided on the first glass substrate 81 side, and the daylighting sheet 84 may be provided on the second glass substrate 82 side.

  Moreover, as shown in FIG. 33, the daylighting sheet 84 and the anisotropic light diffusion sheets 85A and 85B may be provided on the same glass substrate. Specifically, the daylighting sheet 84 may be provided on the inner surface 82a side of the second glass substrate 82, and the anisotropic light diffusion sheets 85A and 85B may be provided on the outer surface 82b side.

[Ninth Embodiment]
Next, the configuration of the daylighting device according to the ninth embodiment will be described.
The daylighting apparatus of this embodiment shown below differs from the daylighting apparatus of each embodiment described above in the configuration of the daylighting sheet and the anisotropic light diffusion sheet. Therefore, in the following description, a different part from previous embodiment is demonstrated in detail, and description of a common location is abbreviate | omitted.

FIG. 34 is a front view illustrating a schematic configuration of the daylighting sheet of the daylighting device according to the ninth embodiment. FIG. 35 is a diagram illustrating main components of the daylighting device according to the ninth embodiment.
As shown in FIGS. 34 and 35, the daylighting device 90 in the present embodiment mainly includes a daylighting sheet 91 and two anisotropic light diffusion sheets 92A and 92B.

  The daylighting sheet 91 has a plurality of daylighting parts (second daylighting parts) 93 extending obliquely with respect to the four sides thereof. In the daylighting sheet described in the previous embodiment, the extending direction of each daylighting portion is configured to extend in a direction intersecting the vertical direction of the daylighting device. However, in the daylighting sheet 91 of the present embodiment, the daylighting device is used. Each lighting unit 93 extends in a direction inclined at a predetermined angle β with respect to a direction intersecting the vertical direction of 90 (Y direction: extending direction of the lighting unit (first lighting unit 3) 3). Yes. That is, the extending direction of the daylighting section 93 is inclined at a predetermined angle β with respect to the upper side 91A or the lower side 91B of the daylighting sheet 91.

  The anisotropic light diffusion sheets 92A and 92B have a rectangular shape in plan view. The tiling gap Wt formed between the opposing end portions 92a and 92a extends vertically along the vertical direction (Z direction) of the daylighting device 90.

  In the previous embodiment, the gap Wt inclined with respect to the extending direction of each daylighting portion of the daylighting sheet was formed by obliquely cutting the opposite ends of the anisotropic light diffusion sheets. In this embodiment, the extending direction of each daylighting portion 93 is inclined with respect to the vertical direction of the daylighting device 90.

  In the daylighting device 90 according to the present embodiment, when the light incident on the daylighting sheet 91 is emitted by changing the angle obliquely upward by each daylighting unit 93, it is highly diffused in the direction of the solid line arrow in the figure, and the broken line arrow Low diffusion in the direction of. Therefore, when only the daylighting sheet 91 is viewed from the room, the glare light appears as a vertical line inclined obliquely with respect to the vertical direction of the daylighting sheet 91.

  Therefore, in the present embodiment, the gap Wt between the anisotropic light diffusion sheets 92A and 92B is configured to extend in the vertical direction. Thereby, the glare emitted from the daylighting sheet 91 is emitted as a point from the intersection with the gap Wt, and is not light that is uncomfortable for a person in the room. As a result, it is possible to greatly reduce the emission of intense glare light that has not been diffused into the room.

  Note that, in the above description, the extending direction of each daylighting section 93 of the daylighting sheet 91 is inclined with respect to the vertical direction of the daylighting apparatus 90. However, the present invention is not limited to this, and the gap Wt between the anisotropic light diffusion sheets 92A and 92B is also included. It may extend diagonally.

[Tenth embodiment]
Next, the configuration of the daylighting device in the tenth embodiment will be described.
The daylighting apparatus of this embodiment shown below differs from the daylighting apparatus of each embodiment described above in the configuration of the daylighting sheet. Therefore, in the following description, a different part from previous embodiment is demonstrated in detail, and description of a common location is abbreviate | omitted.

FIG. 36 is a front view showing a schematic configuration of the daylighting sheet of the daylighting apparatus according to the tenth embodiment. FIG. 37 is a diagram illustrating main components of the daylighting device according to the tenth embodiment.
As shown in FIGS. 36 and 37, the daylighting apparatus 100 according to the present embodiment mainly includes the daylighting sheet 104 and the two anisotropic light diffusion sheets 92A and 92B described in the above embodiment.

  The daylighting sheet 104 includes two first daylighting areas 101 and a second daylighting area 102 having different daylighting characteristics from these first daylighting areas 101. The second daylighting region 102 is located between the pair of first daylighting regions 101 and substantially at the center in the longitudinal direction (Y direction) of the daylighting sheet 104. Here, when viewed from the normal direction of the daylighting apparatus 100, the second daylighting region 102 overlaps the gap Wt between the anisotropic light diffusion sheets 92A and 92B.

  In the first daylighting area 101, the plurality of daylighting units 3 extend in a direction (Y direction) intersecting the vertical direction of the daylighting apparatus 100. On the other hand, in the second daylighting region 102, a plurality of daylighting sections 93 extend at a predetermined angle β with respect to a direction (Y direction) that intersects the vertical direction of the daylighting apparatus 100. That is, the extending direction of the daylighting unit 93 is inclined at a predetermined angle β with respect to the upper side 104A or the lower side 104B of the daylighting sheet 104.

FIG. 38 is a diagram illustrating optical characteristics of the daylighting device according to the tenth embodiment.
As shown in FIG. 38, the daylighting apparatus 100 in the present embodiment is provided with a daylighting sheet 104 on the light incident side surface of the first glass substrate 17 and a pair of different surfaces on the light incident side surface of the second glass substrate 18. Isotropic light diffusion sheets 92A and 92B are provided. The plate thickness of the pair of glass substrates 17 and 18 is 4 mm, and the arrangement interval between them is 6 mm.

In such a configuration, for example, light incident at a predetermined azimuth angle Φ _IN [°] out of sunlight incident on the daylighting device 100 installed in the south-facing window is incident on the daylighting sheet 104. Later, the light is injected into the room through the gap Wt between the anisotropic light diffusion sheets 92A and 92B.

  Therefore, in the configuration of the present embodiment, the width of the second daylighting region 102 of the daylighting sheet 104 in the horizontal direction (Y direction) of the window is determined in consideration of the angle range of the incident azimuth angle of sunlight. As a result, the light that passes through the gap Wt out of the glare light emitted from the daylighting sheet 104 is emitted into the room as a point at the intersection with the gap Wt. Disappear.

  As described above, the preferred embodiments according to the present invention have been described with reference to the accompanying drawings, but the present invention is not limited to the 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.

[Lighting control system]
FIG. 39 is a room model 2000 including a lighting device and an illumination dimming system, and is a cross-sectional view taken along the line JJ ′ of FIG. FIG. 40 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. 39 and 40, a light-reflective ceiling material 2003A is installed on the ceiling 2003a of the room 2003 as a light-reflective ceiling material. 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. 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.

  Although most of the light introduced into the room by the daylighting apparatus 2010 goes to the ceiling near the window 2002, the vicinity of the window 2002 often has a sufficient amount of light. 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 embossed shape formed on the light-reflective ceiling material 2003A, it is possible to control the light distribution characteristics of light 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 device 2010 is used as 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. 39 and 40, 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 (indoor lighting fixture) 2007a, a brightness detection unit 2007b, and a control unit 2007c. The brightness detection unit 2007b and the control unit 2007c are integrated with the indoor lighting fixture 2007a. It is configured.

  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 detection unit 2007b detects the illuminance of the desk surface 2005a of the desk 2005 placed indoors.

  One control unit 2007c provided for each room lighting device 2007 is 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. 41 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. 41, the vertical axis represents the illuminance (lx) on the desk surface, and the horizontal axis represents 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. 41, 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 interior lighting device 2007, and is 750 lx (“JIS Z9110 illumination), which is sufficient for the work over the entire 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.

  DESCRIPTION OF SYMBOLS 1,20,30,40,90,100,2010 ... Daylighting device, 2 ... 1st base material, 2a ... 1st surface, 3 ... Daylighting part (1st daylighting part), 93 ... Daylighting part (2nd daylighting part) ), 9 (9A, 9B) ... light diffusion sheet, L ... light, Wt ... gap, 12, 72, 84, 91,104 ... lighting sheet, 17 ... first glass substrate (first substrate), 18 ... second Glass substrate (second substrate), 23 ... transparent substrate, 33 ... lighting surface, 34 ... anisotropic light diffusion region (light diffusion region), 35 ... flat surface, 50,60 ... blind (lighting device), 52 ... slat, 53 ... Tilt mechanism, 70 ... Roll screen (lighting device), 71 ... Daylighting screen, 76 ... Winding mechanism, 80 ... Multi-layer glass (lighting device), S1 ... Space, 2007b ... Detection unit, 1006 ... Indoor, 2007a ... Indoor lighting equipment (indoor lighting equipment), 2007c ... control unit

Claims (13)

A daylighting sheet comprising: a first base material having light permeability; and a plurality of daylighting units having light transmittance provided on the first surface of the first base material;
A plurality of light diffusion sheets provided on either one of the first surface of the first base material and the second surface opposite to the first surface, and an optical sheet comprising:
The daylighting unit has a reflection surface that reflects light incident on the daylighting unit, and the light reflected by the reflection surface and emitted from the second surface of the first base material is the second surface. Of the two spaces having a virtual plane as a boundary perpendicular to the surface and parallel to the extending direction of the daylighting section, the light travels toward the space on the same side as the light incident side on the reflecting surface. And
A daylighting apparatus, wherein a gap between adjacent light diffusion sheets has a shape other than a straight line extending from one end to the other end of the daylighting sheet in a direction perpendicular to the extending direction of the daylighting unit. The daylighting apparatus according to claim 1, wherein the gap extends obliquely with respect to a direction perpendicular to an extending direction of the daylighting unit.   The light diffusion sheet has anisotropy in the light diffusion direction, and diffuses the light more strongly in a direction intersecting the arrangement direction than in the arrangement direction of the two spaces. The daylighting device described in 1. Further comprising a transparent substrate,
A daylighting region having the same function as the daylighting sheet on the first surface side of the transparent substrate;
The daylighting according to any one of claims 1 to 3, wherein a light diffusion region having a function similar to that of the light diffusion sheet is provided on a second surface side opposite to the first surface. apparatus. A plurality of light diffusion sheets on the second surface of the first base of the daylighting sheet;
The daylighting device according to any one of claims 1 to 3, further comprising: a gap formed by a flat surface between the adjacent light diffusion sheets. The daylighting device according to any one of claims 1 to 5, wherein the light diffusion sheet is disposed on a light incident side of the daylighting sheet. The daylighting device according to any one of claims 1 to 6, wherein the plurality of daylighting sections extend at an angle with respect to one side of the daylighting sheet. A first base material having light permeability;
On the first surface side of the first base material, provided with an optical sheet provided with a plurality of daylighting regions and a light diffusion region located between adjacent daylighting regions,
The extending direction of the plurality of second daylighting portions provided in the light diffusion region is inclined with respect to the extending direction of the plurality of first daylighting portions having light transmittance provided in the daylighting region,
The daylighting unit has a reflection surface that reflects light incident on the daylighting unit, and the light reflected by the reflection surface and emitted from the second surface of the first base material is the second surface. Of the two spaces having a virtual plane as a boundary perpendicular to the surface and parallel to the extending direction of the daylighting section, the light travels toward the space on the same side as the light incident side on the reflecting surface. A daylighting device characterized by comprising: A daylighting screen,
A winding mechanism for freely winding the daylighting screen,
The daylighting device according to any one of claims 1 to 8, wherein the optical sheet is used as the daylighting screen. A plurality of slats arranged side by side at a predetermined interval in the short direction;
A tilt mechanism that tiltably supports the plurality of slats, and
The lighting device according to claim 1, wherein the slat includes the optical sheet. The daylighting device according to claim 10, wherein the gaps between the slats adjacent in the arrangement direction of the plurality of slats are shifted from each other. A first substrate having optical transparency;
A second substrate having optical transparency disposed opposite to the first substrate,
The daylighting device according to any one of claims 1 to 8, wherein at least a part of the optical sheet is disposed between the first substrate and the second substrate or on an outer surface. A daylighting device;
Indoor lighting,
A detection unit for detecting the brightness of the room;
A control unit that controls the indoor lighting device and the detection unit,
A daylighting system using the daylighting apparatus according to any one of claims 1 to 12 as the daylighting apparatus.

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