JP2015222706A - Lighting system and reflective sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting device which can create a three-dimensional visual effect.SOLUTION: A lighting system 10 includes: a reflective sheet 20 having a reflective face with a plurality of unit reflective faces aligned in a first direction and each extending in a second direction; and a light source 40 positioned in such a manner that a longitudinal direction thereof being unparalleled with the first direction. Each of the unit reflective faces includes a reflective portion 23 whose reflective face angle θγ changes in such a manner that it gradually increases from one side of the first direction to the other side thereof or gradually decreases from one side of the first direction to the other side thereof. Here, the reflective face angle is an angle formed between, in a main cut surface, a direction orthogonal to the unit reflective face and a normal direction of the reflective sheet.

Description

  The present invention relates to a reflection sheet having a reflection function, and an illumination system using the reflection sheet.

  For example, as disclosed in Patent Document 1, illumination using indirect illumination is widespread. In indirect lighting, light is emitted from a light source installed in a specific positional relationship with respect to the ceiling, wall, floor, etc., and the interior is illuminated by the reflected light. In indirect illumination, a member or a part directly irradiated with light from a light source may be provided with shading or a three-dimensional structure. In this case, it is possible to generate a special visual pattern to create a design property, for example, a feeling of comfort or a high-class feeling.

JP 2013-101859 A

  However, the visual effect created by the conventional lighting system is only a planar effect, and cannot be said to be sufficient in unexpectedness and design. On the other hand, the present inventors, as a result of intensive studies, irradiate light from a light source arranged in a predetermined positional relationship with respect to the reflective sheet with respect to the reflective sheet having a specific configuration. In this case, it has been found that a three-dimensional visual effect by illusion can be created. This invention is based on such knowledge, and it aims at providing the illuminating device which can create a three-dimensional visual effect, and the reflective sheet used for this illumination system.

The lighting system according to the present invention comprises:
A reflective sheet having a reflective surface including a plurality of unit reflective surfaces arranged in a first direction and extending in a second direction each intersecting the first direction;
A light source arranged such that its longitudinal direction is non-parallel to the first direction,
Each unit reflection surface changes so that the reflection surface angle gradually increases from one side to the other side in the first direction, or gradually from the one side to the other side in the first direction. Including a reflective part that changes to become smaller,
Here, the angle of the reflection surface is such that a direction perpendicular to the unit reflection surface is a normal direction of the reflection sheet in a main cut surface parallel to both the first direction and the normal direction of the reflection sheet. A positive angle value when the direction perpendicular to the unit reflection surface in the main cut surface is inclined to the one side in the first direction with respect to the normal direction of the reflection sheet.

  In the illumination system according to the present invention, the angle of the reflection surface of the reflection portion is gradually increased from one side to the other side in the first direction within an angle range including at least a range of 0 ° to 40 °. Or within an angle range including a range of at least 0 ° to 40 °, the angle may change gradually from the one side to the other side in the first direction.

  In the illumination system according to the present invention, the light source may be arranged on the one side in the first direction with respect to the plurality of unit reflection surfaces.

  In the illumination system according to the present invention, the main cut surface passes through a position where the reflection surface angle of one unit reflection surface is 40 ° and is in the first direction with respect to the normal direction of the reflection sheet. An imaginary straight line extending in a direction inclined by 80 ° to one side may not cross the reflection surface at other positions.

  In the illumination system according to the present invention, in the main cut surface, the first direction passes through a position where the reflection surface angle of one unit reflection surface is 0 ° and is normal to the normal direction of the reflection surface sheet. An imaginary straight line extending in a direction inclined by 50 ° on one side may not cross the reflective surface at other positions.

In the lighting system according to the invention,
Each unit reflection surface is
The reflection surface angle changes so as to gradually increase from one side to the other side in the first direction within an angle range including a range of at least 0 ° to 40 °, or at least 0 ° to 40 °. A first reflecting portion that changes so as to gradually become smaller from the one side to the other side in the first direction within an angle range including a range of less than or equal to °.
The reflection surface angle changes so as to gradually increase from one side to the other side in the first direction within an angle range including at least a range of −40 ° to 0 °, or at least −40 °. A second reflecting portion that changes so as to gradually become smaller from the one side to the other side in the first direction within an angle range including the range of 0 ° or less; and
May be included.

  In the illumination system according to the present invention, the light source includes a first light source disposed on the one side in the first direction with respect to the plurality of unit reflection surfaces, and the first light source with respect to the plurality of unit reflection surfaces. And a second light source disposed on the other side in the direction.

In the lighting system according to the invention,
In the main cut surface, the first reflecting portion of one unit reflecting surface passes through a position where the reflecting surface angle is 40 ° and is in the first direction with respect to the normal direction of the reflecting surface sheet. An imaginary straight line extending in a direction inclined by 80 ° to one side does not intersect the reflective surface at other positions,
In the main cut surface, the first direction with respect to the normal direction of the reflective surface sheet passes through a position where the reflective surface angle of the second reflective portion of one unit reflective surface is −40 °. An imaginary straight line extending in a direction inclined by 80 ° to the other side may not be intersected with the reflecting surface at other positions.

In the lighting system according to the invention,
In the main cut surface, the unit reflecting surface passes through a position where the angle of the reflecting surface of the first reflecting portion is 0 ° and is in the first direction with respect to the normal direction of the reflecting surface sheet. An imaginary straight line extending in a direction inclined by 50 ° to one side does not intersect the reflective surface at other positions,
In the main cut surface, the unit reflection surface passes through a position where the reflection surface angle of the second reflection part is 0 ° and is in the first direction with respect to the normal direction of the reflection surface sheet. An imaginary straight line extending in a direction inclined by 50 ° to the other side may not cross the reflection surface at other positions.

  In the illumination system according to the present invention, the reflection surface may form an incident surface of the reflection sheet with respect to light from the light source.

  In the illumination system according to the present invention, the angle of the reflecting surface of the reflecting portion is gradually increased from one side to the other side in the first direction within an angle range including at least a range of 0 ° to 20 °. Or within an angle range including a range of at least 0 ° to 20 °, the angle may change gradually from the one side to the other side in the first direction.

  In the illumination system according to the present invention, the light source may be arranged on the one side in the first direction with respect to the plurality of unit reflection surfaces.

  In the illumination system according to the present invention, the main cut surface passes through a position where the reflection surface angle of a certain unit reflection surface is 20 ° and is in the first direction with respect to the normal direction of the reflection sheet. An imaginary straight line extending in a direction inclined by 41 ° to one side may not cross the reflection surface at other positions.

  In the illumination system according to the present invention, in the main cut surface, the first direction passes through a position where the reflection surface angle of one unit reflection surface is 0 ° and is normal to the normal direction of the reflection surface sheet. An imaginary straight line extending in a direction inclined by 31 ° on one side may not cross the reflective surface at other positions.

In the lighting system according to the invention,
Each unit reflection surface is
The reflection surface angle changes so as to gradually increase from one side to the other side in the first direction within an angle range including a range of at least 0 ° to 20 °, or at least 0 ° to 20 °. A first reflecting portion that changes so as to gradually become smaller from the one side to the other side in the first direction within an angle range including a range of less than or equal to °.
The reflection surface angle changes so as to gradually increase from one side to the other side in the first direction within an angle range including at least a range of −20 ° to 0 °, or at least −20 °. A second reflecting portion that changes so as to gradually become smaller from the one side to the other side in the first direction within an angle range including the range of 0 ° or less; and
May be included.

  In the illumination system according to the present invention, the light source includes a first light source disposed on the one side in the first direction with respect to the plurality of unit reflection surfaces, and the first light source with respect to the plurality of unit reflection surfaces. And a second light source disposed on the other side in the direction.

In the lighting system according to the invention,
In the main cut surface, the unit reflecting surface passes through a position where the reflecting surface angle of the first reflecting portion is 20 ° and is in the first direction with respect to the normal direction of the reflecting surface sheet. An imaginary straight line extending in a direction inclined by 41 ° to one side does not intersect the reflective surface at other positions,
In the main cut surface, the first direction with respect to the normal direction of the reflecting surface sheet passes through a position where the reflecting surface angle of the second reflecting portion of one unit reflecting surface is −20 °. An imaginary straight line extending in a direction inclined by 41 ° on the other side may not be intersected with the reflecting surface at other positions.

In the lighting system according to the invention,
In the main cut surface, the unit reflecting surface passes through a position where the angle of the reflecting surface of the first reflecting portion is 0 ° and is in the first direction with respect to the normal direction of the reflecting surface sheet. An imaginary straight line extending in a direction inclined by 31 ° to one side does not intersect the reflective surface at other positions,
In the main cut surface, the unit reflection surface passes through a position where the reflection surface angle of the second reflection part is 0 ° and is in the first direction with respect to the normal direction of the reflection surface sheet. An imaginary straight line extending in a direction inclined by 31 ° to the other side may not cross the reflection surface at other positions.

In the lighting system according to the invention,
The reflective sheet has a transparent layer covering the reflective surface,
The transparent layer may form an incident surface of the reflection sheet with respect to light from the light source.

In the lighting system according to the invention,
A connection surface is provided between two unit reflection surfaces adjacent in the first direction,
The regular reflectance at the connection surface may be lower than the regular reflectance at the unit reflective surface.

  In the illumination system according to the present invention, the connection surface may be formed as an uneven surface.

In the lighting system according to the invention,
A connection surface is provided between two unit reflection surfaces adjacent in the first direction,
The absorptance at the connecting surface may be higher than the absorptivity at the unit reflecting surface.

In the lighting system according to the invention,
A connection surface is provided between two unit reflection surfaces adjacent in the first direction,
The connection surface may be patterned.

The reflective sheet according to the present invention is
A reflective surface including a plurality of unit reflective surfaces arranged in a first direction and extending in a second direction each intersecting the first direction;
Each unit reflection surface changes so that the reflection surface angle gradually increases from one side to the other side in the first direction, or gradually from the one side to the other side in the first direction. Including a reflective part that changes to become smaller,
Here, the angle of the reflection surface is such that a direction perpendicular to the unit reflection surface is a normal direction of the reflection sheet in a main cut surface parallel to both the first direction and the normal direction of the reflection sheet. A positive angle value when the direction perpendicular to the unit reflection surface in the main cut surface is inclined to the one side in the first direction with respect to the normal direction of the reflection sheet.

  According to the present invention, a three-dimensional visual effect can be created.

FIG. 1 is a perspective view showing an illumination system for explaining an embodiment of the present invention. FIG. 2 is a cross-sectional view showing an example of a reflective sheet that can be incorporated into the illumination system of FIG. FIG. 3 is a diagram for explaining the operation of the illumination device, and shows the illumination system by projecting an optical path onto a plane parallel to the main cutting surface of the reflection sheet. FIG. 4 is a diagram showing the illumination system in the same plane as in FIG. 3, and is a diagram for explaining an angle setting method. FIG. 5 is a graph showing the relationship between the incident angle θα to the reflection sheet and the emission angle θβ from the reflection sheet. FIG. 6 is a graph showing the relationship between the emission angle θβ from the reflection sheet and the reflection surface angle θγ of the reflection surface that reflects the light incident on the reflection sheet to the observation point. 7 is a view showing the reflection sheet in the same cross section as FIG. 2, and the position of the reflection surface of the reflection sheet that forms a mirror image of the light source at each position in FIG. 4 and the incident direction to the position. FIG. FIG. 8 is a view corresponding to FIG. 2 and showing a modification of the reflective sheet. FIG. 9 is a view corresponding to FIG. 2 and showing another modification of the reflection sheet. FIG. 10 is a diagram corresponding to FIG. 7 and showing yet another modification of the reflective sheet. FIG. 11 is a diagram corresponding to FIG. 7 and showing yet another modification of the reflective sheet. FIG. 12 is a diagram corresponding to FIG. 7, and is a diagram showing still another modified example of the reflection sheet. FIG. 13 is a diagram corresponding to FIG. 2, and is a diagram showing still another modified example of the reflection sheet. FIG. 14 is a graph corresponding to FIG. 6, and is a graph showing the relationship between the emission angle θβ from the reflection sheet and the reflection surface angle θγ of the reflection surface that reflects the light incident on the reflection sheet to the observation point. is there. FIG. 15 is a diagram corresponding to FIG. 7 and showing yet another modification of the reflective sheet. FIG. 16 is a diagram corresponding to FIG. 7 and showing yet another modification of the reflective sheet. FIG. 17 is a diagram corresponding to FIG. 1 and showing a modification of the illumination system. FIG. 18 is a diagram corresponding to FIG. 2, and is a diagram showing still another modified example of the reflection sheet. FIG. 19 is a diagram corresponding to FIG. 1 and showing an illumination system using the reflective sheet of FIG. FIG. 20 is a diagram corresponding to FIG. 1 and showing yet another modification of the illumination system.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the drawings attached to the present specification, for the sake of illustration and ease of understanding, the scale, the vertical / horizontal dimension ratio, and the like are appropriately changed and exaggerated from those of the actual ones.

  In the present specification, terms such as “sheet”, “plate”, “panel”, and “film” are not distinguished from each other based only on the difference in names. For example, the “reflective sheet” is a concept including members that can be called plates, panels, films, and the like, and thus the “reflective sheet” is called “reflective plate”, “reflective panel”, “reflective film”. It cannot be distinguished only by the difference in the name of the member.

  The “sheet surface (plate surface, panel surface, film surface)” is a target when the target sheet-like (plate shape, panel shape, film shape) member is viewed as a whole and globally. It refers to the surface that matches the planar direction of the sheet-like member (plate-like member, panel-like member, film-like member). In one embodiment described below, the sheet surface of the reflection sheet, the sheet surface of a main body sheet to be described later of the reflection sheet, and the sheet surface of a main body portion to be described later of the main body sheet are parallel to each other. Moreover, the normal direction with respect to a sheet-like (plate-like, panel-like, film-like) member is the sheet surface (plate surface, panel surface, It is the normal direction to the film surface.

  Furthermore, as used in this specification, the shape and geometric conditions and the degree thereof are specified. For example, terms such as “parallel”, “orthogonal”, “identical”, length and angle values, etc. Without being bound by meaning, it should be interpreted including the extent to which similar functions can be expected.

  As shown in FIG. 1, the illumination system 10 includes a light source 40 and a reflection sheet 20 that receives light from the light source 40. As shown in FIGS. 1 and 2, the reflection sheet 20 has a reflection surface 21 that reflects light from the light source 40. The reflection surface 21 is formed of a large number of unit reflection surfaces 22 arranged in the first direction d1. Each unit reflection surface 22 extends linearly in a second direction d2 that is non-parallel to the first direction d1. The reflection sheet 20 receives light emitted from the light source 40 and causes the reflection surface 21 to anisotropically reflect the light. More specifically, the reflection sheet 20 is more diffusible in the first direction d1 than in the second direction d2. On the other hand, the light source 40 has a longitudinal direction dl, and is positioned with respect to the reflective sheet 20 so that the longitudinal direction dl is not parallel to the first direction d1.

  In the illumination system 10 described here, the reflection sheet 20 forms a mirror image of each part of the light source 40 at each position on the surface vp spaced from the reflection sheet 20. The surface vp composed of the mirror image of the light emitting point is perceived as a light emitting surface by illusion.

  In the example shown in FIG. 1, the lighting system 10 is disposed in a room defined by a ceiling 91, a wall 92, and a floor 93. The reflection sheet 20 forms part or all of the ceiling 91. Moreover, the reflection sheet 20 is positioned so that the normal direction thereof is along the vertical direction. On the other hand, the light source 40 includes a first light source 40a disposed on one side in the first direction d1 and a second light source 40b disposed on the other side in the first direction d1 so as to face the first light source 40a. doing. The light sources 40a and 40b are respectively installed on a pair of walls 92 connected to the ceiling 91 from both sides in the first direction d1. The light source 40 is disposed away from the reflection sheet 20 along the normal direction of the reflection sheet 20. In other words, the light source 40 is located below the reflection sheet 20 along the vertical direction. For this reason, in the example shown in FIG. 1, as indicated by a two-dot chain line, the mirror image group of the light source 40 reflected at each position of the reflection sheet 20 is located above the ceiling. And the pseudo light emission surface vp which consists of the mirror image group of the light source 40 comes to be perceived as a pseudo ceiling by an illusion. Hereinafter, the reflection sheet 20 and the light source 40 will be described in more detail. And after that, the effect | action of the illumination system 10 is demonstrated in detail.

  First, the reflection sheet 20 will be described. The reflection sheet 20 is a sheet-like member that can exhibit an anisotropic diffuse reflection function. As described above, the reflection sheet 20 has the reflection surface 21 including a large number of unit reflection surfaces 22 arranged in the first direction d1. Each unit reflection surface 22 extends linearly in a second direction d2 that is non-parallel to the first direction d1. Each unit reflection surface 22 changes so that the reflection surface angle θγ gradually increases from one side to the other side in the first direction d1, or from one side to the other side in the first direction d1. It has the reflection part 23 which changes so that it may become small gradually toward it. On the other hand, the unit reflection surface 22 has a substantially constant configuration along the second direction d2. Due to the unit reflection surface 22, the reflection sheet 20 is more diffusible in the first direction d1 than in the second direction d2.

  By the way, the reflection surface angle θγ is a reflection of the direction dγ orthogonal to the unit reflection surface 22 in the main cut surface shown in FIG. 2 which is parallel to both the first direction d1 and the normal direction nd of the reflection sheet 20. This is an angle θγ formed with respect to the normal direction nd of the sheet 20. Here, the direction dγ orthogonal to the unit reflection surface 22 is a direction orthogonal to the tangent tpγ to the unit reflection surface 22 in the main cut surface. The value of the reflection surface angle θγ is positive when the direction dγ orthogonal to the unit reflection surface 22 in the main cut surface is inclined to one side in the first direction d1 with respect to the normal direction nd of the reflection sheet 20. The angle value of Here, the side where the direction dγ orthogonal to the unit reflection surface 22 is inclined with respect to the normal direction nd of the reflection sheet 20 is from the light source 40 to the reflection surface 21 along the normal direction nd of the reflection sheet 20. The direction dγ orthogonal to the unit reflecting surface 21 and the normal direction nd of the reflecting sheet 20 are compared on the side where the light of the incident light, in other words, the side on which the reflected light reflected by the reflecting surface 21 travels.

  1 to 4, FIG. 7 to FIG. 13 and FIG. 15 to FIG. 20 showing the illustrated embodiment and its modifications, the one side in the first direction d1 is the first extending left and right in the drawing. The right side in the first direction d1 refers to the right side in the first direction d1, and the other side in the first direction d1 refers to the left side in the first direction d1 extending left and right in the drawing.

  In addition to the reflection surface angle θγ, including the outer surface angle θδ described later, the angle “changes gradually” means that the angle always changes greatly as the reflection surface angle θγ shown in FIG. This is a concept that includes not only continuing, but also a case where the angle does not change in at least some of the regions. On the other hand, the reflecting surface angle θγ that “changes gradually” does not change so as to decrease. Similarly, not only the reflection surface angle θγ but also the outer surface angle θδ described later, the angle “changes gradually” means that the angle is always small like the reflection surface angle θγ shown in FIG. It is a concept that includes not only the continuous change but also the case where the angle does not change in at least a part of the region. On the other hand, the reflection surface angle θγ that “changes gradually” does not change so as to increase. Therefore, not only the curved unit reflection surface shown in FIG. 2 but also the bent unit reflection surface changes the reflection surface angle θγ to “gradually increase” or “gradually decrease”. Can be expressed.

  In the illustrated embodiment, each unit reflection surface 22 includes a first reflection portion 23a in which the reflection surface angle θγ takes a positive angle value, and a second reflection portion 23b in which the reflection surface angle θγ takes a negative angle value. And. As shown in FIG. 2, the unit reflection surface 22 has a light source 40 positioned on the indoor side along the normal direction nd of the reflection sheet 20 on the main cut surface, that is, along the normal direction nd of the reflection sheet 20. It bulges in a convex shape on the side where it is present. As shown in FIG. 2, the first reflecting portion 23a is located on one side of the second reflecting portion 23b along the first direction d1. The unit reflecting surface 22 is formed only by the first reflecting portion 23a and the second reflecting portion 23b. At the position where the first reflecting portion 23 a and the second reflecting portion 23 b are joined, a tip end portion 22 a that protrudes most indoors of the unit reflecting surface 22 is formed. Further, a base end portion 22b on one side of the unit reflecting surface 22 that forms the side farthest from the room of the unit reflecting surface 22 is formed at the end of the first reflecting portion 23a opposite to the second reflecting portion 23b. A base end portion 22b on the other side of the unit reflecting surface 22 that forms the side farthest away from the room of the unit reflecting surface 22 is formed at the end of the second reflecting portion 23b opposite to the first reflecting portion 23a. Yes. In the illustrated example, the reflection surface angle θγ of the first reflection portion 23a changes so as to gradually decrease from one side to the other side in the first direction d1, and the reflection surface angle θγ of the second reflection portion 23b. However, it changes so that it may become small gradually toward the other side from the one side in the 1st direction d1.

  Further, “showing stronger diffusibility in the first direction d1 than in the second direction d2” is determined as follows. First, a parallel light flux traveling in the normal direction of the reflection sheet 20 is irradiated onto one surface 20 a of the reflection sheet 20. And the brightness | luminance on one surface of the reflective sheet 20 is measured. The half-value angle in the luminance angle distribution in the plane along both the normal direction and the first direction d1 of the reflection sheet 20 is in the plane along both the normal direction of the reflection sheet 20 and the second direction d2. If it is larger than the half-value angle in the luminance angle distribution at, it is determined that the diffusibility is stronger in the first direction d1 than in the second direction d2. The one surface of the reflection sheet 20 is the surface 20a on the side irradiated with light from the light source 40a in the illumination system 10, that is, the incident surface.

  In the illustrated example, the reflective sheet 20 includes a main body sheet 30 including unit elements 35, a reflective layer 25 formed on the main body sheet 30, and a functional layer 28 that covers a part of the reflective layer 25. Yes. The main body sheet 30 includes a sheet-like main body portion 33 and a large number of unit elements 35 formed on the main body portion 33. As can be understood from FIG. 1, the plurality of unit elements 35 are arranged in the first direction d1, and each unit element 35 extends linearly in a direction intersecting the first direction d1. Each unit element 35 extends linearly. Moreover, the two unit elements 35 adjacent along the first direction d1 are spaced apart in the first direction d1. That is, the plurality of unit elements 35 are arranged at intervals in the first direction d1. As shown in FIG. 2, each unit reflection surface 22 of the reflection surface 21 is formed by the outer surface of the reflection layer 25 that covers the outer surface 37 of the unit element 35.

  FIG. 2 shows the reflection sheet 20 in a cross section that is parallel to both the normal direction nd of the reflection sheet 20 and the first direction d1 that is the arrangement direction of the unit elements 35. In this specification, the cross section shown in FIG. 2 is called a main cut surface. In the illustrated example, the cross-sectional shape of each unit element 35 in the main cutting plane is constant along the second direction d2 that is the longitudinal direction of the unit element 35. The plurality of unit elements 35 included in the main body sheet 30 are all configured similarly.

  As shown in FIG. 2, in the illustrated example, the cross-sectional shape of each unit element 35 on the main cut surface is a shape that tapers toward the light output side. That is, in the main cut surface, the width of the unit element 35 parallel to the sheet surface of the reflection sheet 20 decreases as the distance from the main body portion 33 increases along the normal direction nd of the reflection sheet 20.

  Moreover, in order to implement | achieve the shape of the unit reflective surface 22 mentioned above, in the example shown, the outer surface 37 of the unit element 35 is formed as follows. First, each unit element 35 changes its outer surface angle θδ so as to gradually increase from one side in the first direction d1 to the other side, or from one side to the other side in the first direction d1. It has a part which changes so that it may become small gradually. In particular, in the illustrated example, each unit element 35 includes a first outer surface portion 38a in which the outer surface angle θδ takes a positive angle value, and a second outer surface portion 38b in which the outer surface angle θδ takes a negative angle value. It is out.

  At the position where the first outer surface portion 38a and the second outer surface portion 38b are joined, a distal end portion 37a of the outer surface 37 that protrudes most indoors is formed. In addition, a base end portion 37b on one side of the outer surface 37 that forms the side farthest away from the interior of the outer surface 37 is formed at the end of the first outer surface portion 38a opposite to the second outer surface portion 38b, and the second outer surface A base end portion 37b on the other side of the outer surface 37 that forms the side farthest away from the interior of the outer surface 37 is formed at the end of the portion 38b opposite to the first outer surface portion 38a. Further, in the illustrated example, the outer surface angle θδ of the first outer surface portion 38a changes so as to gradually decrease from one side to the other side in the first direction d1, and the outer surface angle θδ of the second outer surface portion 38b is It changes so as to gradually decrease from one side to the other side in the first direction d1.

  As shown in FIG. 2, the outer surface angle θδ is an angle θδ formed by the direction dδ orthogonal to the outer surface 37 with respect to the normal direction nd of the reflection sheet 20 in the main cut surface. Here, the direction dδ orthogonal to the outer surface 37 is a direction orthogonal to the tangent tpδ to the outer surface 37. Further, the value of the outer surface angle θδ is a positive angle when the direction dδ orthogonal to the unit reflecting surface 21 in the main cut surface is inclined to one side in the first direction d1 with respect to the normal direction nd of the reflecting sheet 20. Value. That is, the sign of the outer surface angle θδ can be specified in the same manner as the reflection surface angle θγ.

  Further, on the main cutting plane, the outer contour of the unit element 35 is configured as a line that can be approximated by any one of a curve and a straight line such as an arc and an elliptic arc, or a combination thereof. In particular, in the illustrated example, the cross-sectional shape of the unit element 35 in the main cut surface has a shape corresponding to a part of a circle. That is, in the illustrated example, the main body sheet 30 is formed as a cylindrical lens sheet, in other words, a lenticular lens sheet. As a result, the unit element 35 has an outer surface angle θδ that continuously changes over a wide angle range.

  The main body sheet 30 having the above-described configuration is produced by, for example, extrusion molding or by molding a unit element 35 made of an ionizing radiation curable resin, for example, an ultraviolet curable resin, on a base material. can do. Note that the arrangement pitch of the unit elements 35 in the first direction d1 can be, for example, about 50 μm to 1 cm. The resin constituting the main body sheet 30 may be colorless or colored, and may be transparent, translucent, or opaque.

  Next, the reflective layer 25 and the functional layer 28 will be described.

  In the illustrated example, the reflective layer 25 is provided so as to cover the entire surface of the main body sheet 30 on the side where the unit elements 35 are provided. On the other hand, the functional layer 28 is located on a region of the reflective layer 25 that is not located on the unit element 35. The surface of the reflective layer 25 facing away from the main body sheet 30 forms the reflective surface 21. On the other hand, the surface of the functional layer 28 facing away from the reflection layer 25 forms a connection surface 24 positioned between the two unit reflection surfaces 22 of the reflection surface 21. In the illustrated example, the surface 20 a facing the room side of the reflection sheet 20 is formed by the unit reflection surface 22 of the reflection surface 21 and the connection surface 24.

  In the example shown in FIG. 2, the reflective layer 25 extends with a substantially constant thickness on the surface of the main body sheet 30 on which the unit elements 35 are provided. Similarly, the functional layer 28 also extends over a part of the reflective layer 25 with a substantially constant thickness. As a result, the outer contour of the outermost surface 20a of the reflective sheet 20 defined by the reflective layer 25 and the functional layer 28 is the same as the outer contour of the surface of the main body sheet 30 on which the unit elements 35 are provided.

  The reflective layer 25 can be formed as a thin film made of a material having high reflectivity, for example, a metal such as silver or aluminum. More specifically, the reflective layer 25 can be formed by transferring a metal foil or printing an ink containing a reflective material such as metal. Further, the reflective layer 25 can be formed from, for example, a metal material by using a vapor phase method (dry process) such as a vacuum deposition method, a sputtering method, an ion plating method, or a CVD method. In addition, a plurality of types of dielectrics having different refractive indexes can be formed as a multilayer reflective film by alternately laminating them by the vapor phase method or the like.

  The functional layer 28 is a layer that expresses some function. The connection surface 24 formed by the functional layer 28 is not a surface that contributes to the formation of an illusion image. And when the connection surface 24 specularly reflects the light from the light source 40 with a high reflectance, the visibility of the illusion image is deteriorated. Therefore, as a typical example, the functional layer 28 functions as a diffusion layer that diffuses light or an absorption layer that absorbs light. According to the functional layer 28 formed as a diffusion layer, the regular reflectance at the connection surface 24 can be made lower than the regular reflectance at the unit reflection surface 22. Thereby, the reflection on the connection surface 24 can be effectively prevented. Further, according to the functional layer 28 formed as the absorption layer, the absorption rate at the connection surface 24 can be made lower than the absorption emissivity at the unit reflection surface 22. The functional layer 28 can be formed by, for example, ink jet printing.

  In addition, the comparison of the regular reflectance and absorption rate between the connection surface 24 and the unit reflective surface 22 can be implemented as follows. First, the test light is irradiated from the same direction to each of the connecting surface 24 and the unit reflecting surface 22 having the same inclination angle. Next, the brightness of the portion is confirmed through a microscope from the direction in which the test light is regularly reflected. And it is evaluated that the higher the luminance, the higher the regular reflectance or the lower the absorptance. On the contrary, it is evaluated that the lower the luminance, the lower the regular reflectance or the higher the absorptance.

  As the diffusion layer, a mat layer having irregularities formed on the surface can be used. The mat layer is formed as a layer having a binder resin and particles dispersed in the binder resin. For example, by making the thickness of the binder resin smaller than the particle size of the particles, the surface of the mat layer has irregularities. As the absorption layer, for example, a layer having a black pigment can be used. As the black pigment, carbon black or titanium black can be used.

  Next, the light source 40 will be described. In the illustrated illumination system 10, a first light source 40 a disposed on one side in the first direction and a second light source 40 b disposed on the other side in the first direction are provided as the light source 40. . As described above, each of the light sources 40a and 40b has the longitudinal direction dl, and is positioned with respect to the reflective sheet 20 so that the longitudinal direction dl is not parallel to the first direction d1. Each light source 40a, 40b extends a certain length in at least the second direction d2. In particular, in the example shown in FIG. 1, the longitudinal direction dl of the light sources 40 a and 40 b is parallel to the second direction d <b> 2 that is the longitudinal direction dl of the unit element 35.

  Each of the light sources 40a and 40b provided on the pair of walls 92 has a single light emitter (in other words, a light emitting member) or a plurality of light emitters forming a group. As the light emitters constituting the light sources 40a and 40b, various known light emitters, for example, cold cathode tubes, particularly cold cathode tubes with a narrow light distribution direction, may be used. Moreover, each light source 40a, 40b may be comprised using the some point light-emitting body, typically the some light emitting diode (LED) arranged in a line form.

  As shown well in FIG. 1, in this illumination system 10, the light emitter that constitutes the light source 40 is arranged at a position shifted from the reflection sheet 20 to the indoor side along the normal direction of the reflection sheet 20. Yes. For this reason, the light having directivity emitted by the light emitting body forming the light source 40 can be directly incident on the light incident surface 20 a of the reflection sheet 20.

  Moreover, in this illumination system 10, as shown in FIG. 1, the light emitters forming the respective light sources 40a and 40b are normal to the reflection sheet 20 with respect to the edge region of the reflection sheet 20 along the first direction d1. It is located facing the direction. More specifically, the pair of light sources 40a and 40b are respectively disposed at positions shifted downward from the pair of edges of the reflection sheet 20 facing the first direction d1.

  By the way, in the plane parallel to the main cutting plane, the light source 40 does not emit light radially with a uniform luminous intensity, but emits light with directivity. The light source 40 emits light with a non-uniform luminous intensity (unit: candela) in each direction, and has a peak luminous intensity in a specific direction. As the inclination angle with respect to the specific direction increases, the value of the luminous intensity gradually decreases. Preferably, the arrangement of the light sources 40 is determined in consideration of such directivity characteristics (light distribution characteristics, in other words, distribution of luminous intensity angles (directions)). Specifically, in the plane parallel to the main cutting plane, the specific direction causing the peak luminous intensity, that is, the optical axis of the light emitted from the light emitting portion of the light source 40 located on the plane is the reflection sheet 20. The light source 40 is disposed so as to extend toward the upper position, and more preferably, to extend toward the center or the vicinity thereof in the first direction d1 of the reflection sheet 20.

  Next, the operation of such a lighting system 10 will be described.

  Each light source 40 mainly projects light toward the reflection sheet 20. The reflection sheet 20 has unit reflection surfaces 22 arranged in the first direction d1. Then, due to the unit reflection surface 22, the reflection sheet 20 can diffuse light from the light source 40 incident on each position from a specific direction in various directions. Accordingly, an observer who observes the reflection sheet 20 can observe light reflected at each position in the first direction d1 of the reflection sheet 20 from various directions.

Here, FIG. 3 shows a diagram in which the illumination system 10 is projected onto one projection plane parallel to the main cutting plane. In FIG. 3, the area | region of the one side in the 1st direction d1 of the illumination system 10 is shown. FIG. 3 shows the action of the reflection sheet 20 on the light emitted from the first light source 40a arranged on one side in the first direction d1. As shown in FIG. 3, the light emitted from the emission position P _s of the light source 40, have a predetermined reflection surface angle θγ on unit reflecting surface 22 provided in each of the positions P ₁ to P ₅ of the reflection sheet 20 is reflected by the position, advance toward the position P _o of the observer's eye.

In this case, observer eyes in the position P _o is located observes the mirror image of the light source 40a reflected at the position P ₁ of the reflection sheet 20 in the position P _i1. The mirror image position P _i1 is located on a straight line connecting the observer's eye position P _o and the reflection position P ₁ . In the plane shown in FIG. 3, the distance l ₁ between the reflection position P ₁ and the mirror image position P _{i1 is} equal to the distance l ₁ between the reflection position P ₁ and the light source position P _is . Also, portions of the reflective layer 25 on the unit element 35 to form a mirror image of the light source 40a to the position P _i1 is a direction parallel to the reflection surface orthogonal to the straight line connecting the light source position P _s and mirror position P _i1 3 It becomes. Similarly, observer eyes in the position _{P o} is located observes reflected at other positions _P 2 to P ₅ of the reflection sheet 20 light source 40 of the mirror image of the position _P i2 _{to P i5} respectively. In this figure, the light source 40 and the mirror image positions P _{i1 to} P _i1 are located on the projection plane, but the observer's eye position P _o and the reflection positions P _{1 to} P ₅ are not on the projection plane. Reflection position _P 1 to P ₅ is located in front of the projection plane, and towards than _{P 1} of _{P 5} is positioned more forward. In addition, the position P _o of the observer's eye is located in the more forward.

Here, as shown in FIG. 4, the incident angle θα and the reflection angle θβ are set. FIG. 4 is a perspective view as seen from the observer's viewpoint P _o. In other words, FIG. 4 is a view corresponding to FIG. 3 and projected onto the main cutting plane. Incidence angle θα is incident angle at the time of entering from the light source 40 to the reflective sheet 20, the reflection angle θβ is definitive when towards has been the reflected Susumidashi from the seat 20 observer position P _o reflected by the reflection sheet 20 The emission angle.

  More specifically, the incident angle θα is an angle formed by the traveling direction of incident light with respect to the normal direction nd of the reflection sheet 20 on the projection plane in FIG. Similarly to the reflection surface angle θγ described above, the incident angle θα is reflected in a direction parallel to the traveling direction of the incident light in the region closer to the light source 40 than the reflection sheet 20 along the normal direction nd of the reflection sheet 20. When the sheet 20 is inclined to one side in the first direction d1 with respect to the normal direction nd of the sheet 20, a positive angle value is set. Therefore, in the illustrated embodiment, the incident angle θα for the light incident on each position of the reflection sheet 20 from the first light source 40a takes a positive value, and reaches each position on the reflection sheet 20 from the second light source 40b. The incident angle θα for the incident light takes a negative value. On the other hand, in the projection plane of FIG. 4, the reflection angle θβ is defined by the traveling direction of the light emitted from the reflecting sheet 20, that is, the traveling direction of the reflected light on the reflecting sheet 20 with respect to the normal direction nd of the reflecting sheet 20. Is an angle. The reflection angle θβ is opposite to the incident angle θα, and the direction parallel to the traveling direction of the emitted light in the region closer to the light source 40 than the reflection sheet 20 along the normal direction nd of the reflection sheet 20 is the reflection sheet 20. A positive angle value is obtained when the inclination is inclined to the other side in the first direction d1 with respect to the normal direction nd.

Then, as shown in FIG. 4, the light from the light source 40 is, if it is reflected by the reflecting surface 21 has a reflecting surface angle θγ the reflection sheet 20 toward the viewer viewpoint position P _o, the incident angle θα and The reflection angle θβ satisfies the following relationship together with the reflection surface angle θγ.
θγ = (θα-θβ) / 2

なお、図４に示された座標において、ｙ軸は、観察者の視点位置Ｐ_ｏから鉛直上方にとっている。また、ｘ軸は、天井９１と当該天井９１の奥にある壁９２の交線上にとっている。すなわち、主切断面への投影図において、反射シート２０によって形成される天井９１上に、ｘ軸が画定されている。そして、ｙ軸とｘ軸の交点に、原点（０，０）を定めている。また、式中の「Ｙ_０」は、ｙ軸に沿った原点と光源位置Ｐ_ｓとの距離[単位：ｃｍ]であり、「Ｗ」は、ｘ軸に沿った原点と光源位置Ｐ_ｓとの距離[単位：ｃｍ]であり、「Ｌ」は、ｙ軸に沿った原点と目の位置Ｐ_ｏとの距離[単位：ｃｍ]である。 Moreover, when now to set the coordinate as shown in FIG. 4, using a reflection angle θβ of light towards the viewer viewpoint position P _o, the coordinates of the position Pi of the mirror image of the light source (x, y) is the following Specified by the formula.

In the coordinates shown in FIG. 4, the y-axis is vertically upward from the observer's viewpoint position _Po . Further, the x-axis is on the intersection line of the ceiling 91 and the wall 92 behind the ceiling 91. In other words, the x-axis is defined on the ceiling 91 formed by the reflection sheet 20 in the projection onto the main cut surface. An origin (0, 0) is defined at the intersection of the y axis and the x axis. In addition, “Y ₀ ” in the equation is a distance [unit: cm] between the origin along the y-axis and the light source position P _s, and “W” is the origin along the x-axis and the light source position P _s Distance [unit: cm], and “L” is the distance [unit: cm] between the origin along the y-axis and the eye position _Po .

  As described above, the light from the part of the light source 40 located on one surface parallel to the main cutting surface is reflected in each linear region extending in the first direction d1 of the reflection sheet 20 located on the surface. Reflected at position. As a result, a mirror image of the light source 40 is formed on the virtual curve vl.

  The unit reflection surface 22 of the reflection sheet 20 extends linearly in the second direction d2. Therefore, the generation of the mirror image on the virtual curve vl is performed on the part of the light source 40 arranged at each position along the second direction d2. As a result, as shown in FIG. 1, a mirror image of each part of the light source 40 installed on each of the pair of walls 92 and extending in the second direction d2 is formed on the pseudo curved surface vp. The pseudo curved surface vp is perceived as a light emitting surface and is recognized as if there is a ceiling at the position of the pseudo curved surface vp by an illusion. The pseudo curved surface vp is an arch-shaped curved surface having a width in the second direction d2. The pseudo curved surface vp is located above the reflection sheet 20 irradiated with light from the light source 40, that is, above the actual ceiling formed by the reflection sheet 20. Therefore, the observer perceives as if there is an arched ceiling at a position higher than the actual ceiling. That is, according to the lighting system 10 described here, it is possible to bring about a visual effect that makes the room feel wider by a sense of depth, and a visual effect that gives a superior design to the three-dimensional ceiling.

In addition, the present inventors actually manufactured the illumination system shown in FIG. 1 and confirmed the visual effect. The width along the first direction of the reflective sheet was 400 cm. The light source was installed such that its longitudinal direction extends parallel to the second direction. The length of the light source along the second direction was 150 cm. The _{Y 0} in FIG. 4 was 23cm. L in FIG. 4 was 76 cm. The main body sheet of the reflective sheet was produced by molding unit elements on a PET film using an ionizing radiation curable resin. Next, a reflective layer was formed on the main body sheet by depositing aluminum by a vacuum deposition method. Then, the light absorption layer which contains a black pigment in a part of reflective layer was created by inkjet printing. The reflection sheet produced in this way had the same configuration and the same installation state as those shown in FIGS. And when the light from a light source was irradiated to the reflective sheet, the arch type pseudo ceiling was able to be confirmed. Further, the position at which this pseudo ceiling was perceived coincided with the position Pi (x, y) estimated in the coordinate system set in FIG.

Further, FIGS. 5 and 6 show that the inventors changed the combination of “Y ₀ ”, “W”, and “L” in FIG. 4 to change the incident angle θα, the reflection angle θβ, and the reflection surface angle θγ. It is the result of investigating the range. In the graphs shown in FIG. 5 and FIG. 6, the values on the x-axis in FIG. 4 are 0 or more while changing the conditions regarding “Y ₀ ”, “W”, and “L” in the typical ranges shown in Table 1. The range of the incident angle θα, the reflection angle θβ, and the reflection surface angle θγ necessary for generating a mirror image of the light source on the pseudo curved surface vp within a range of W or less is shown. That is, in the graph of FIG. 5 and FIG. 6, from an overhead position Px to be directly above the position P _o of the observer's eye along the normal direction nd of the reflective sheet 20, along the normal direction nd of the reflection sheet 20 The range of each angle θα, θβ, θγ that can generate a mirror image of the light source on the pseudo curved surface vp is shown up to one side end position Py1 that is directly above the first light source 40a.

Here, if it is possible to form a mirror image in the range of from an overhead position Px to be directly above the observer position P _o to the one end position Py1 to be directly above the first light source 40a, the first to the second direction d2 1 An observer who inclines his / her line of sight toward the one side in the direction d1 confirms the semi-arched pseudo ceiling over almost the entire area that can be observed. That is, the illusion effect by the illumination system 10 can be effectively exhibited. Further, as in the above-described embodiment, when the light source 40 and the reflection sheet 20 are symmetric with respect to the normal direction nd of the reflection sheet 20, they are arranged on one side in the first direction. The light from the first light source 40a can form a semi-arched pseudo ceiling in a half region located on one side in the first direction, and the second light source 40b disposed on the other side in the first direction. The half-arched pseudo ceiling can be formed in the half region located on the other side in the first direction by the light from the first side. That is, an observer standing at the center in the first direction d1 can relate to the arched pseudo ceiling formed over the entire area in the first direction d1.

As shown in FIGS. 5 and 6, if the values of “Y ₀ ”, “W” and “L” are set within the typical ranges shown in Table 1, the reflection angle θβ is , And changed within a range from 0 ° corresponding to the overhead position Px to approximately 50 ° corresponding to the one side end position Py1. The incident angle θα changed within a range from about 80 ° corresponding to the overhead position Px to about 50 ° corresponding to the one side end position Py1. The reflection surface angle θγ changed within a range from about 40 ° corresponding to the overhead position Px to 0 ° corresponding to the one side end position Py1.

  That is, according to the investigation results of the present inventors, as shown in FIG. 7, reflection from one side to the other side in the first direction d1 within an angle range including at least a range of 0 ° to 40 °. The reflection surface angle θγ decreases from one side to the other side in the first direction d1 within an angle range including a range of at least 0 ° to 40 °, or the surface angle θγ gradually increases. When the unit reflection surfaces 22 arranged at the respective positions along the first direction d1 have the reflecting portions 23 and 23a that change in this manner, the first light source arranged on one side in the first direction d1 The light from 40a makes it possible to generate a mirror image of the light source on the pseudo curved surface vp in the range from the overhead position Px to the one side end position Py1. That is, when the reflection surface angle θγ of the unit reflection surface 22 gradually changes within an angle range including at least the range of 0 ° to 40 °, the illusion effect of the illumination system 10 is present in the one side region in the first direction d1. It comes to be demonstrated effectively.

  Further, the mirror image of the first light source 40a at the overhead position Px is a direction (more preferably 85 °) where the incident angle θα is 80 ° at a position on the unit reflection surface 22 where the reflection surface angle θγ is 40 °. Direction). Further, the mirror image of the light source 40 at one side end position Py1 is in a direction (more preferably 60 °) where the incident angle θα is 50 ° at a position on the unit reflection surface 22 where the reflection surface angle θγ is 0 °. Direction). Then, from the viewpoint of clearly generating a mirror image of the first light source 40a over the range from the overhead position Px to the one side end position Py1, as shown in FIG. A virtual straight line vla that passes through a position where the surface angle θγ is 40 ° and extends in a direction inclined by 80 ° (more preferably 85 °) to one side in the first direction d1 with respect to the normal direction nd of the reflective surface sheet 20. However, it is preferable not to intersect with the reflecting surface 21 at other positions different from the position where the reflecting surface angle θγ is 40 °, and similarly, it passes through the position where the reflecting surface angle θγ of the unit reflecting surface 22 is 0 °. In addition, a virtual straight line vlb extending in a direction inclined by 50 ° (more preferably 60 °) to one side in the first direction d1 with respect to the normal direction nd of the reflective surface sheet 20 has a reflective surface angle θγ of 0 °. Different from the above position Preferably it does not intersect with the reflecting surface 21 at the other locations that. In this case, the direct light from the first light source 40a is reflected by the reflecting surface 21 of the reflection sheet 20, so that a mirror image of the first light source 40a is generated over the range from the overhead position Px to the one side end position Py1. Is possible. Therefore, the illumination system 10 can effectively exhibit the illusion effect.

  In the illustrated example, the reflecting surface angle θγ of the first reflecting portion 23a changes so as to gradually decrease from one side to the other side in the first direction d1. That is, the position where the reflection surface angle θγ is 0 ° is located closer to the tip 22a of the unit reflection surface 22 than the position where the reflection surface angle θγ is 40 °. Further, the inclination angle of the virtual straight line vlb with respect to the normal direction nd of the reflection sheet 20 is smaller than the inclination angle of the virtual straight line vla with respect to the normal direction nd of the reflection sheet 20. Therefore, for the first reflecting portion 23a in which the reflecting surface angle θγ changes so as to gradually decrease from one side to the other side in the first direction d1, the condition regarding the virtual line vlb described above is the virtual line. It becomes easy to be satisfied compared with the condition regarding vla. Accordingly, the main cut surface passes through a position where the reflection surface angle θγ of the unit reflection surface 22 is 40 °, and is 80 ° (more than one side in the first direction d1 with respect to the normal direction nd of the reflection surface sheet 20). If the virtual straight line vla extending in the inclined direction (preferably 85 °) does not intersect the reflective surface 21 at another position different from the position where the reflective surface angle θγ is 40 °, the virtual straight line vlb is related. The above-mentioned conditions are also satisfied, and as a result, the illusion effect by the lighting system 10 can be effectively exhibited.

  Further, as can be understood from FIG. 7, by providing the connecting surface 24 between the two adjacent unit reflection surfaces 22, the two adjacent unit reflection surfaces 22 are separated from each other in the first direction d1. Thereby, the virtual straight line vla extending from one unit reflective surface 22 becomes difficult to contact the other unit reflective surface 22, and as a result, the above-described condition regarding the virtual straight line vla is easily satisfied. That is, by providing the connection surface 24, the illusion effect by the illumination system 10 is more effectively exhibited.

  In addition, as in the above-described embodiment, when the light source 40 and the reflection sheet 20 have a symmetric configuration with respect to the normal direction nd of the reflection sheet 20, the other side in the first direction In order to effectively exhibit the illusion effect, it is preferable that the following conditions are satisfied in consideration of the symmetry of the incident angle θα and the reflecting surface angle θγ. That is, as shown in FIG. 7, the unit reflection surfaces 22 arranged at the respective positions along the first direction d1 are within the angle range including at least −40 ° to 0 ° in the first direction d1. The reflection surface angle θγ changes from one side to the other side so as to gradually increase, or within an angle range including at least −40 ° to 0 °, from one side to the other side in the first direction d1 Having the reflection portions 23 and 23b that change so that the reflection surface angle θγ decreases toward the first direction from the overhead position Px by the light from the second light source 40b disposed on the other side in the first direction d1. This is preferable in that a mirror image of the light source can be generated on the pseudo curved surface vp in a range up to the other side end position Py2 which is the other side in the direction d1. In other words, when the reflection surface angle θγ of the unit reflection surface 22 gradually changes within an angle range including at least −40 ° to 0 °, the illusion of the illumination system 10 in the other region in the first direction d1. The effect comes to be demonstrated effectively.

  Further, the mirror image of the second light source 40b at the overhead position Px is a direction (more preferably −85) in which the incident angle θα is −80 ° at a position on the unit reflecting surface 22 where the reflective surface angle θγ is −40 °. It is formed by entering from the direction (°). Further, the mirror image of the light source 40b at the other end position Py2 is a direction (more preferably −60 °) where the incident angle θα is −50 ° at a position on the unit reflection surface 22 where the reflection surface angle θγ is 0 °. It is formed by entering from the direction of From the viewpoint of clearly generating a mirror image of the second light source 40b over the range from the overhead position Px to the other end position Py2, as shown in FIG. An imaginary straight line that passes through a position where the surface angle θγ is −40 ° and extends in a direction inclined by 80 ° (more preferably 85 °) to the other side in the first direction d1 with respect to the normal direction nd of the reflective surface sheet 20. It is preferable that vlc does not intersect the reflecting surface 21 at other positions different from the position where the reflecting surface angle θγ is −40 °, and similarly, the position where the reflecting surface angle θγ of the unit reflecting surface 22 is 0 °. And a virtual straight line vld extending in a direction inclined by 50 ° (more preferably 60 °) to the other side in the first direction d1 with respect to the normal direction nd of the reflective surface sheet 20 has a reflective surface angle θγ of 0 °. And said position Preferably it does not intersect with the reflecting surface 21 at different other locations. In this case, the direct light from the second light source 40b arranged on the other side in the first direction d1 is reflected by the reflecting surface 21 of the reflection sheet 20, so that it is located on the other side in d1 in the first direction from the overhead position Px. The mirror image of the second light source 40b can be generated over the range up to the other end position Py2. Therefore, the illumination system 10 can effectively exhibit the illusion effect.

  In the illustrated example, the reflecting surface angle θγ of the second reflecting portion 23b changes so as to gradually decrease from one side to the other side in the first direction d1. For such a second reflecting portion 23b, the above-described condition relating to the virtual straight line vld is more easily satisfied than the condition relating to the virtual straight line vlc. Therefore, in the main cut surface, it passes through a position where the reflection surface angle θγ of the unit reflection surface 22 is −40 °, and is 80 ° to the other side in the first direction d1 with respect to the normal direction nd of the reflection surface sheet 20 ( More preferably, if the virtual straight line vlc extending in the inclined direction does not intersect the reflective surface 21 at other positions different from the position where the reflective surface angle θγ is −40 °, the virtual straight line vlc The above-mentioned conditions regarding vld are also satisfied, and as a result, the illusion effect by the illumination system 10 can be effectively exhibited.

  In addition, as can be understood from FIG. 7, by providing the connection surface 24 between two adjacent unit reflection surfaces 22, the virtual straight line vlc extending from one unit reflection surface 22 is converted into another unit reflection surface. As a result, the above-described condition regarding the virtual straight line vlc is easily satisfied. That is, by providing the connection surface 24, the illusion effect by the illumination system 10 is more effectively exhibited.

  According to the present embodiment as described above, the illumination system 10 includes the plurality of unit reflection surfaces 22 arranged in the first direction d1 and extending in the second direction d2 each intersecting the first direction d1. The reflection sheet 20 having the reflection surface 21 and the light source 40 arranged so that the longitudinal direction thereof is not parallel to the first direction d1 are included. Each unit reflecting surface 22 changes so that the reflecting surface angle θγ gradually increases from one side to the other side in the first direction d1, or gradually from one side to the other side in the first direction d1. The reflection part 23 which changes so that it may become small is included. According to such an illumination system 10, it is possible to form a mirror image of the light source 40 on the pseudo curved surface vp located in a region above the reflection sheet 20. For this reason, according to this lighting system 10, it is possible to bring about a visual effect that makes the room feel wider by a sense of depth, and a visual effect that gives a superior design to the three-dimensional ceiling.

  Further, according to the above-described embodiment, the connection surface 24 is provided between the two unit reflection surfaces 22 adjacent in the first direction d1. The regular reflectance at the connection surface 24 is lower than the regular reflectance at the unit reflection surface 22, or the absorption rate at the connection surface 24 is higher than the absorption rate at the unit reflection surface 22. It has become. Therefore, it is possible to prevent the reflection on the connection surface 24 and the connection surface 24 from being viewed brightly. As a result, the illusion effect using the reflection on the unit reflecting surface 22 can be more effectively exhibited.

  As mentioned above, although this invention was demonstrated based on one embodiment illustrated, this invention is not limited to the above embodiment, In addition to this, it can implement in a various aspect. Hereinafter, an example of modification will be described with reference to the drawings. In the following description and the drawings used in the following description, the same reference numerals as those used for the corresponding parts in the above embodiment are used for the parts that can be configured in the same manner as in the above embodiment. A duplicate description is omitted.

  In embodiment mentioned above, an example of the layer structure of the reflection sheet 20 which has the main body sheet | seat 30, the reflection layer 25, and the functional layer 28 was shown. However, the layer configuration of the reflection sheet 20 is not limited to the above-described example, and various changes can be made. For example, in the above-described embodiment, the example in which the reflective layer 25 is formed so as to cover the entire surface of the main body sheet 30 on which the unit elements 35 are provided has been illustrated, but as illustrated in FIG. The reflective layer 25 may be provided only on the outer surface 37 of the unit element 35 of the main body sheet 30. As an example, the reflective layer 25 of the reflective sheet 20 shown in FIG. 8 can be formed by applying a silver paste only on the unit elements 35 by printing and firing the silver paste. The functional layer 28 located between the two reflective layers 25 adjacent in the first direction d1 can be formed by ink jet printing.

  As another example, the reflective sheet 20 shown in FIG. 9 includes a sheet-like main body sheet 30 having one main surface parallel to each other, and a functional layer formed so as to cover one surface of the main body sheet 30. 28, and the reflective layer 25 formed as the convex part 39 on the functional layer 28 at an interval. The reflective layer 25 is formed by shaping a reflective material. The unit reflection surface 22 is formed by the surface of the reflection layer 25 formed as the convex portion 39.

  Furthermore, without providing the functional layer 28, the connection surface 24 having a diffusion function can be formed by making the surface of the reflective layer 25 or the surface of the main body sheet 30 an uneven surface.

  Further, the connection surface 24 may be patterned. By this patterning, the connection surface 24 may display a pattern (image) such as a figure, a design, a color, a picture, a photograph, and a character, and information such as a character, a mark, and a number. According to such a reflection sheet 20, it is possible to greatly improve the design of the illumination system 10.

  Moreover, the reflective surface 21 demonstrated by the above-mentioned embodiment is only an example, for example, as shown in the head 10-FIG. 12, various changes are possible. In the example shown in FIG. 10, the main body sheet 30 includes a main body portion 33 and unit elements 35 provided on one surface of the main body portion 33. The unit elements 35 are arranged without a gap in the first direction d1. Therefore, the outer surface 37 of the unit element 35 forms a surface on one side of the main body sheet 30, and the reflective layer 25 is formed so as to cover the entire surface. In the example of FIG. 10, the unit reflecting surface 22 includes a first reflecting portion 23a in which the reflecting surface angle θγ takes a positive value and a second reflecting surface angle θγ in which the reflecting surface angle θγ takes a negative value, as in the above-described embodiment. And a reflection portion 23b.

  The first reflecting portion 23a and the second reflecting portion 23b can effectively exhibit the illusion effect as in the above-described embodiment by satisfying the same angle condition as in the above-described embodiment. That is, from the viewpoint of effectively exhibiting the illusion effect by the illumination system 10, the first reflecting portion 23a is formed such that the reflection surface angle θγ gradually changes within a range including 0 ° or more and 40 ° or less. Similarly, the second reflecting portion 23b is preferably formed so that the reflecting surface angle θγ gradually changes within a range including −40 ° to 0 °.

  In addition, the viewpoint of clearly generating a mirror image of the first light source 40a in the range from the overhead position Px to the one side end position Py1 by reflecting light from the first light source 40a located on one side in the first direction d1. From the main cut surface, it passes through a position where the reflection surface angle θγ of the unit reflection surface 22 is 40 ° and is 80 ° (one side in the first direction d1 with respect to the normal direction nd of the reflection surface sheet 20). More preferably 85 °) It is preferable that the imaginary straight line vla extending in the inclined direction does not intersect the reflecting surface 21 at other positions different from the position where the reflecting surface angle θγ is 40 °. 22 passes through a position where the reflection surface angle θγ becomes 0 ° and extends in a direction inclined by 50 ° (more preferably 60 °) to one side in the first direction d1 with respect to the normal direction nd of the reflection surface sheet 20. Virtual straight line v b is preferably not cross the reflecting surface 21 at different other positions and the position of the reflecting surface angle θγ becomes 0 °. Further, a viewpoint of clearly generating a mirror image of the second light source 40b over a range from the overhead position Px to the other end position Py2 by reflecting light from the second light source 40b located on the other side in the first direction d1. From the main cut surface, it passes through a position where the reflection surface angle θγ of the unit reflection surface 22 is −40 ° and is 80 ° to the other side in the first direction d1 with respect to the normal direction nd of the reflection surface sheet 20. It is preferable that the virtual straight line vlc extending in the inclined direction (more preferably 85 °) does not intersect the reflecting surface 21 at other positions different from the position where the reflecting surface angle θγ is −40 °. A direction that passes through a position where the reflection surface angle θγ of the reflection surface 22 is 0 ° and is inclined 50 ° (more preferably 60 °) to the other side in the first direction d1 with respect to the normal direction nd of the reflection surface sheet 20. Virtual extending to Line vld are preferably does not intersect the reflecting surface 21 at different other positions and the position of the reflecting surface angle θγ becomes 0 °.

  By the way, in the example shown in FIG. 10, the reflection surface angle θγ of the first reflecting portion 23a changes so as to gradually increase from one side to the other side in the first direction d1. In the unit reflection surface 22 including the first reflection portion 23a, the reflection surface angle θγ is likely to be 40 ° in the vicinity of the tip portion 22a of the unit reflection surface 22. Therefore, according to the reflection sheet 20, the virtual straight line vla inclined more greatly with respect to the normal direction nd of the reflection sheet 20 intersects the reflection surface 21 only at one point where the reflection surface angle θγ is 40 °, It becomes easy to satisfy the above-mentioned conditions.

  Similarly, in the example shown in FIG. 10, the reflection surface angle θγ of the second reflecting portion 23b changes so as to gradually increase from one side to the other side in the first direction d1. In the unit reflection surface 22 including such a second reflection portion 23b, the reflection surface angle θγ tends to be −40 ° in the vicinity of the tip portion 22a of the unit reflection surface 22. Therefore, according to the reflection sheet 20, the virtual straight line vlc that is more greatly inclined with respect to the normal direction nd of the reflection sheet 20 intersects the reflection surface 21 only at one point where the reflection surface angle θγ is −40 °, It becomes easy to satisfy the above-mentioned conditions.

  The inclination angle of the virtual straight line vlb with respect to the normal direction nd of the reflection sheet 20 is significantly smaller than the inclination angle of the virtual straight line vla with respect to the normal direction nd of the reflection sheet 20. Therefore, the condition relating to the virtual straight line vlb is much more easily satisfied than the condition relating to the virtual straight line vla. Similarly, the magnitude of the inclination angle of the virtual straight line vld with respect to the normal direction nd of the reflective sheet 20 is significantly smaller than the magnitude of the inclination angle of the virtual straight line vlc with respect to the normal direction nd of the reflective sheet 20. Therefore, the above-described condition relating to the virtual straight line vld is much more easily satisfied than the condition relating to the virtual straight line vlc. From the above, the reflection sheet 20 shown in FIG. 11 satisfies the above-described conditions regarding the virtual straight lines vla, vlb, vlc1, and vld, even if the connection surface 24 is reduced or the connection surface 24 is not provided. It becomes easy.

  Further, in the above-described embodiment, each unit reflection surface 22 includes a first reflection portion 23a in which the reflection surface angle θγ takes a positive value, and a second reflection portion 23b in which the reflection surface angle θγ takes a negative value, Although the example which has is shown, it is not restricted to this. As described above, the light from the first light source 40a located on one side in the first direction d1 is reflected to generate a mirror image of the first light source 40a over the range from the overhead position Px to the one side end position Py1. Is the reflection part 23a in which the reflection surface angle θγ takes a positive value. On the other hand, the light from the second light source 40b located on the other side in the first direction d1 is reflected to generate a mirror image of the second light source 40b over the range from the overhead position Px to the other end position Py2. Is a reflecting portion 23b in which the reflecting surface angle θγ takes a negative value. Therefore, the unit reflection surface 22 located in the vicinity of the first light source 40a among the plurality of unit reflection surfaces 22 included in the reflection surface 21, that is, the unit reflection surface 22 in the one side region in the first direction d1 is illustrated in FIG. 11 and FIG. 12, the reflection surface angle θγ may have only a reflection part 23 having a positive value. Further, the unit reflection surface 22 located in the vicinity of the second light source 40b among the plurality of unit reflection surfaces 22 included in the reflection surface 21, that is, the unit reflection surface 22 in the other side region in the first direction d1 is reflected. You may make it have only the reflection part from which surface angle (theta) gamma takes a negative value.

  In the example shown in FIG. 11, each unit reflection surface 22 has a reflection part 23 configured in the same manner as the first reflection part 23 a of the above-described embodiment. On the other hand, in the example shown in FIG. 12, each unit reflection surface 22 has a reflection portion 23 configured in the same manner as the first reflection portion 23a of the unit reflection surface 22 shown in FIG. Further, in the example shown in FIGS. 11 and 12, a connection surface 24 is formed between two adjacent unit reflection surfaces 22. The connection surface 24 is inclined with respect to the sheet surface of the reflection sheet 20. In the reflective sheet 20 shown in FIG. 11 and FIG. 12, the surface of the reflective layer 25 in which the unit reflective surface 22 is laminated on the unit element 35 of the main body sheet 30 is the same as the reflective sheet 20 shown in FIG. The connection surface 24 can be formed by the surface of the functional layer 28 laminated on the portion between the two adjacent unit elements 35 of the main body sheet 30.

  Further, in the above-described embodiment, the reflection surface 21 and the connection surface 24 of the reflection sheet 20 are the outermost surfaces on the side where the light from the light source 40 is incident, that is, the reflection sheet 20 is incident on the light from the light source 40. Although the example which formed the surface was shown, it is not restricted to this example. In the example shown in FIG. 13, the main body portion 33 side of the main body sheet 30 forms the light incident surface 20 a of the reflection sheet 20 and receives light from the light source 40. That is, the main body sheet 30 forms a transparent layer 31 that covers the reflective layer 25. The transparent layer 31 made of the main body sheet 30 forms the incident surface of the reflection sheet 20 with respect to the light from the light source 40. The light incident on the main body sheet 30 is reflected by the reflection surface 21 formed by the surface of the reflection layer 25 facing the main body sheet 30. In the example shown in FIG. 13, the reflecting surface 21 has the same shape as the reflecting surface 21 shown in FIG. Such a reflection sheet 20 is preferable in that the reflection surface 21 is not exposed indoors, and therefore, the deterioration of the reflection surface 21 and the accumulation of dust and the like on the reflection surface 21 can be prevented. In the example shown in FIG. 13, a protective layer 29 that covers the reflective layer 25 from the side opposite to the main body sheet 30 is further provided. The protective layer 29 also prevents the reflective layer 25 from being deteriorated, and can contribute to the illumination system 10 continuing to effectively exhibit the expected optical illusion effect.

Even when the reflection sheet 20 shown in FIG. 13 is used, if the values of “Y ₀ ”, “W”, and “L” are set within the typical ranges shown in Table 1, reflection is performed. The angle θβ varies within a range from 0 ° corresponding to the overhead position Px to approximately 50 ° corresponding to the one side end position Py1, and the incident angle θα is one from about 80 ° corresponding to the overhead position Px. It changes within a range up to about 50 ° corresponding to the side end position Py1. That is, even when the reflection sheet 20 whose reflection surface 21 is covered with the transparent layer 31 is used, the relationship of FIG. 5 is established between the incident angle θα and the reflection angle θβ as in the above-described embodiment.

On the other hand, the light from the light source 40 is refracted when entering the transparent layer 31 before reaching the reflecting surface 21. Further, the light reflected by the reflecting surface 21 is also refracted when it is emitted from the transparent layer 31 and changes the traveling direction. Therefore, when the reflection sheet 20 having the reflection surface 21 covered with the transparent layer 31 is used, the relationship shown in FIG. 6 does not hold between the reflection angle θβ and the reflection surface angle θγ. In this example, on the assumption that the surface of the transparent layer 31 is a flat surface, the following relationship using the refractive index n _t of the transparent layer 31 is the incident angle θα, the reflection angle θβ, and the reflection surface angle θγ. It comes to hold in between.
θγ = (θαt−θβt) / 2
_{^{θαt = sin -1 (sinθα / n}} t)
_{^{θβt = sin -1 (sinθβ / n}} t)
Here, the angle θαt is an angle formed by the traveling direction of the light incident on the transparent layer 31 of the reflection sheet 20 at the incident angle θα with respect to the normal direction to the reflection sheet 20. Further, the angle θβt is an angle formed by the traveling direction in the transparent layer 31 of the light emitted from the transparent layer 31 of the reflection sheet 20 at the angle θβ with respect to the normal direction to the reflection sheet 20.

FIG. 14 shows that the inventors investigated the ranges of the reflection angle θβ and the reflection surface angle θγ by changing the combination of “Y ₀ ”, “W”, and “L” in FIG. 4 under the conditions shown in Table 1. It is a result. In the graph shown in FIG. 14 together with FIG. 5, the value on the x axis in FIG. 4 is 0 or more while changing the conditions regarding “Y ₀ ”, “W” and “L” in the typical range shown in Table 1. The range of the incident angle θα and the reflection surface angle θγ necessary for generating a mirror image of the light source on the pseudo curved surface vp within a range of W or less is shown. That is, in the graphs of FIGS. 5 and 14, when the reflection sheet 20 whose reflection surface 21 is covered with the transparent layer 31 having a flat surface is used, the observation is performed along the normal direction nd of the reflection sheet 20. from overhead position Px to be directly above the user's eye position P _o, reflected along the normal direction nd of the sheet 20 become to one end position Py1 immediately above the first light source 40a, a mirror image of the light source onto the simulated curved surface vp The ranges of the angles θα, θβ, and θγ that can be generated are shown. In the calculation of the reflection surface angle θγ shown in FIG. 14, the refractive index n _t of the transparent layer 31 is assumed to be 1.5. The refractive index value 1.5 is a refractive index value of a general resin material used for an optical sheet. As shown in FIG. 14, the reflection surface angle θγ changed within a range from about 20 ° corresponding to the overhead position Px to 0 ° corresponding to the one side end position Py1.

  That is, according to the investigation results of the inventors of the present invention, as shown in FIG. 15, reflection from one side to the other side in the first direction d1 within an angle range including at least a range of 0 ° to 20 °. The reflection surface angle θγ decreases from one side to the other side in the first direction d1 within an angle range including a range of at least 0 ° to 20 °, or the surface angle θγ gradually increases. When the unit reflection surfaces 22 arranged at the respective positions along the first direction d1 have the reflecting portions 23 and 23a that change in this manner, the first light source arranged on one side in the first direction d1 The light from 40a makes it possible to generate a mirror image of the light source on the pseudo curved surface vp in the range from the overhead position Px to the one side end position Py1. That is, when the reflection surface angle θγ of the unit reflection surface 22 gradually changes within an angle range including at least the range of 0 ° or more and 20 ° or less, the illusion effect of the illumination system 10 in the one side region in the first direction d1 is obtained. It comes to be demonstrated effectively.

The mirror image of the first light source 40a at the overhead position Px is incident on the reflection sheet 20 from the direction where the incident angle θα is 80 ° at the position on the unit reflection surface 22 where the reflection surface angle θγ is 20 °. It is formed by reflecting the reflected light. Further, the mirror image of the light source 40 at the one end position Py1 is incident on the reflection sheet 20 from the direction where the incident angle θα is 50 ° at the position on the unit reflection surface 22 where the reflection surface angle θγ is 0 °. It is formed by reflecting the reflected light. Assuming that the surface of the transparent layer 31 is flat and the refractive index n _t of the transparent layer 31 is 1.5, the light that has entered the reflective sheet 20 at an incident angle θα of 80 ° in the transparent layer 31 is obtained. The angle formed by the traveling direction with respect to the normal direction of the reflection sheet 20 is 41 °. Further, under the same assumption, the angle formed by the traveling direction in the transparent layer 31 of the light incident on the reflection sheet 20 at the incident angle θα of 50 ° with respect to the normal direction of the reflection sheet 20 is 31 °. Become.

  Therefore, from the viewpoint of clearly generating a mirror image of the first light source 40a over the range from the overhead position Px to the one side end position Py1, as shown in FIG. 15 and FIG. An imaginary straight line vle that passes through a position where the reflection surface angle θγ of 22 is 20 ° and extends in a direction inclined by 41 ° to one side in the first direction d1 with respect to the normal direction nd of the reflection surface sheet 20 is a reflection surface It is preferable not to intersect the reflecting surface 21 at other positions different from the position where the angle θγ is 20 °. Similarly, the reflecting surface 21 passes through the position where the reflecting surface angle θγ of the unit reflecting surface 22 is 0 ° and The imaginary straight line vlf extending in a direction inclined at 31 ° to one side in the first direction d1 with respect to the normal direction nd of the sheet 20 is a reflection surface at other positions different from the position where the reflection surface angle θγ is 0 °. 2 It is preferable not to cross 1. In this case, the direct light from the first light source 40a is reflected by the reflecting surface 21 of the reflection sheet 20, so that a mirror image of the first light source 40a is generated over the range from the overhead position Px to the one side end position Py1. Is possible. Therefore, the illumination system 10 can effectively exhibit the illusion effect.

  In addition, as shown in FIGS. 15 and 16, when the light source 40 and the reflection sheet 20 have a symmetric configuration about the normal direction nd of the reflection sheet 20, the other side in the first direction d <b> 1. In order to effectively exhibit the optical illusion effect, it is preferable that the following conditions are satisfied in consideration of the symmetry of the incident angle θα and the reflecting surface angle θγ. That is, as shown in FIGS. 15 and 16, the unit reflection surfaces 22 arranged at the respective positions along the first direction d1 are within the angle range including at least −20 ° to 0 °. One side in the first direction d1 changes within an angle range including at least −20 ° to 0 ° in the reflection surface angle θγ gradually increasing from one side to the other side in the direction d1. Having the reflecting portions 23 and 23b that change so that the reflecting surface angle θγ decreases from the other side toward the other side by the light from the second light source 40b arranged on the other side in the first direction d1. Is preferable in that a mirror image of the light source can be generated on the pseudo-curved surface vp in a range from the other end position Py2 which is the other side in the first direction d1. In other words, when the reflection surface angle θγ of the unit reflection surface 22 gradually changes within an angle range including at least −20 ° to 0 °, the illusion of the illumination system 10 in the other region in the first direction d1. The effect comes to be demonstrated effectively.

  Further, the mirror image of the second light source 40b at the overhead position Px is from the direction where the incident angle θα is −80 ° to the reflective sheet 20 at the position on the unit reflective surface 22 where the reflective surface angle θγ is −20 °. It is formed by reflecting incident light. Further, the mirror image of the light source 40b at the other end position Py2 is incident on the reflection sheet 20 from the direction where the incident angle θα is −50 ° at the position on the unit reflection surface 22 where the reflection surface angle θγ is 0 °. It is formed by the reflected light being reflected. From the viewpoint of clearly generating a mirror image of the second light source 40b over the range from the overhead position Px to the other side end position Py2, as shown in FIGS. An imaginary straight line vlg that passes through a position where the reflection surface angle θγ of 22 is −20 ° and extends in a direction inclined by 41 ° to the other side in the first direction d1 with respect to the normal direction nd of the reflection surface sheet 20 is reflected. It is preferable not to intersect the reflecting surface 21 at other positions different from the position where the surface angle θγ is −20 °, and similarly, the unit reflecting surface 22 passes through a position where the reflecting surface angle θγ is 0 ° and The imaginary straight line vlh extending in the direction inclined at 31 ° to the other side in the first direction d1 with respect to the normal direction nd of the reflective surface sheet 20 is at other positions different from the above-mentioned position where the reflective surface angle θγ is 0 °. Reflective surface 2 It is preferable not to cross 1. In this case, the direct light from the second light source 40b arranged on the other side in the first direction d1 is reflected by the reflecting surface 21 of the reflection sheet 20, so that it is located on the other side in d1 in the first direction from the overhead position Px. The mirror image of the second light source 40b can be generated over the range up to the other end position Py2. Therefore, the illumination system 10 can effectively exhibit the illusion effect.

  In the example shown in FIG. 15, the reflection surface angle θγ changes so as to gradually increase from one side to the other side in the first direction d1. However, the present invention is not limited to the example shown in FIG. 15, and even when the reflection sheet 20 having the reflection surface 21 covered with the transparent layer 31 is used, as shown in FIG. You may change so that it may become small gradually toward the other side from the one side in d1. Also in the example illustrated in FIG. 16, when the above-described condition described with respect to the example illustrated in FIG. 15 is satisfied, the reflection surface 21 of the reflection sheet 20 reflects the direct light from the light source 40, thereby causing an illusion effect. Can be effectively exhibited.

  In the example shown in FIGS. 15 and 16, the angle formed by the traveling direction of the light from the light source 40 with respect to the normal direction of the reflective sheet 20 is incident on the transparent layer 31 formed of the main body sheet 30. Get smaller. Therefore, in the example shown in FIGS. 15 and 16, the condition relating to the angle range of the reflection surface angle θγ and the condition relating to the virtual straight lines vle, vlf, vlg, and vlh are easily satisfied. Therefore, according to the illumination system 10 shown in FIG.15 and FIG.16, it becomes possible to exhibit an illusion effect effectively.

  Still another modification will be described. In the above-described embodiment, a pair of light sources 40a and 40b arranged to face each other is provided, and each of the light sources 40a and 40b is a first direction d1 that is an arrangement direction of the unit elements 35. Although the example extended while having a uniform shape in the 2nd direction d2 which cross | intersects was shown, it is not restricted to this example. For example, as illustrated in FIG. 17, the light sources 40a and 40b may be arranged at intervals along the second direction d2. According to this example, as shown in FIG. 17, the pseudo curved surface vp on which the mirror images of the light sources 40a and 40b are located is also perceived at intervals along the second direction d2. Further, when the light sources 40a and 40b have a plurality of light emitters arranged in the longitudinal direction dl, the arrangement interval of the light emitters along the longitudinal direction dl of the light sources 40a and 40b is not constant. The pseudo-curved surface vp which is not uniform along the second direction d2 is perceived.

  Furthermore, as shown in FIG. 18, the reflection sheet 20 may further include a stripe-shaped shielding layer 27 that extends in the second direction d <b> 2 at intervals along the first direction d <b> 1. The shielding layer 27 is a layer having a light absorption function, and shields a region on the reflection surface 21 covered by the shielding layer 27. The modification of the reflection sheet 20 shown in FIG. 18 is configured in the same manner as the reflection sheet of the above-described embodiment except that the shielding layer 37 is provided. When the reflection sheet 20 shown in FIG. 18 is used, as shown in FIG. 19, the pseudo curved surface vp where the mirror images of the light sources 40a and 40b are located is spaced along the first direction d1, Be perceived. Further, when the reflection sheet 20 shown in FIG. 18 is used in combination with the light sources 40a and 40b arranged at intervals along the second direction d2, as shown in FIG. 20, the light sources 40a and 40b are used. The pseudo curved surface vp in which the mirror image is located is perceived at intervals in both the first direction d1 and the second direction d2.

  Furthermore, in the above-described embodiment, an example in which the reflection sheet 20 of the illumination system 10 is used as a ceiling is shown, but the present invention is not limited to this. For example, the reflection sheet 20 may be used as the wall 92 or the floor 93 to create a visual effect that gives the wall 92 or the floor 93 a depth. Moreover, it is also possible to use the illumination system 10 outdoors instead of indoors.

  In addition, although the some modification with respect to embodiment mentioned above was demonstrated above, naturally, it is also possible to apply combining several modifications suitably.

DESCRIPTION OF SYMBOLS 10 Illumination system 20 Reflective sheet 20a Surface 21 Reflective surface 22 Unit reflective surface 22a Tip part 22b Base end part 23 Reflective part 23a First reflective part 23b Second reflective part 24 Connection surface 25 Reflective layer 27 Shielding layer 28 Functional layer 29 Protective layer 30 Main body sheet 31 Transparent layer 33 Main body part 35 Unit element 37 Outer surface 37a Front end part 37b Base end part 38a First outer surface part 38b Second outer surface part 39 Convex part 40 Light source 40a First light source 40b Second light source 91 Ceiling 92 Wall 93 Floor

Claims (24)

A reflective sheet having a reflective surface including a plurality of unit reflective surfaces arranged in a first direction and extending in a second direction each intersecting the first direction;
A light source arranged such that its longitudinal direction is non-parallel to the first direction,
Each unit reflection surface changes so that the reflection surface angle gradually increases from one side to the other side in the first direction, or gradually from the one side to the other side in the first direction. Including a reflective part that changes to become smaller,
Here, the angle of the reflection surface is such that a direction perpendicular to the unit reflection surface is a normal direction of the reflection sheet in a main cut surface parallel to both the first direction and the normal direction of the reflection sheet. Illumination that is an angle formed, and a positive angle value is obtained when a direction orthogonal to the unit reflection surface in the main cut surface is inclined to the one side in the first direction with respect to a normal direction of the reflection sheet system.   The angle of the reflection surface of the reflection part changes so as to gradually increase from one side to the other side in the first direction within an angle range including at least a range of 0 ° to 40 °, or at least 2. The illumination system according to claim 1, wherein the illumination system changes so as to gradually decrease from the one side to the other side in the first direction within an angle range including a range of 0 ° to 40 °.   The illumination system according to claim 2, wherein the light source is disposed on the one side in the first direction with respect to the plurality of unit reflection surfaces.   In the main cut surface, the unit reflection surface passes through a position where the reflection surface angle is 40 ° and is inclined by 80 ° to one side in the first direction with respect to the normal direction of the reflection sheet. The illuminating system according to claim 2 or 3, wherein an imaginary straight line extending in a direction does not intersect the reflecting surface at other positions.   In the main cut surface, the unit reflection surface passes through a position where the reflection surface angle is 0 °, and is inclined by 50 ° to one side in the first direction with respect to the normal direction of the reflection surface sheet. The illuminating system according to any one of claims 2 to 4, wherein an imaginary straight line extending in the selected direction does not intersect the reflecting surface at other positions. Each unit reflection surface is
The reflection surface angle changes so as to gradually increase from one side to the other side in the first direction within an angle range including a range of at least 0 ° to 40 °, or at least 0 ° to 40 °. A first reflecting portion that changes so as to gradually become smaller from the one side to the other side in the first direction within an angle range including a range of less than or equal to °.
The reflection surface angle changes so as to gradually increase from one side to the other side in the first direction within an angle range including at least a range of −40 ° to 0 °, or at least −40 °. A second reflecting portion that changes so as to gradually become smaller from the one side to the other side in the first direction within an angle range including the range of 0 ° or less; and
The lighting system according to claim 1, comprising:   The light source is disposed on the one side in the first direction with respect to the plurality of unit reflection surfaces and on the other side in the first direction with respect to the plurality of unit reflection surfaces. And a second light source. In the main cut surface, the first reflecting portion of one unit reflecting surface passes through a position where the reflecting surface angle is 40 ° and is in the first direction with respect to the normal direction of the reflecting surface sheet. An imaginary straight line extending in a direction inclined by 80 ° to one side does not intersect the reflective surface at other positions,
In the main cut surface, the first direction with respect to the normal direction of the reflective surface sheet passes through a position where the reflective surface angle of the second reflective portion of one unit reflective surface is −40 °. The illuminating system according to claim 6 or 7, wherein an imaginary straight line extending in a direction inclined by 80 ° to the other side of the light does not intersect the reflecting surface at other positions. In the main cut surface, the unit reflecting surface passes through a position where the angle of the reflecting surface of the first reflecting portion is 0 ° and is in the first direction with respect to the normal direction of the reflecting surface sheet. An imaginary straight line extending in a direction inclined by 50 ° to one side does not intersect the reflective surface at other positions,
In the main cut surface, the unit reflection surface passes through a position where the reflection surface angle of the second reflection part is 0 ° and is in the first direction with respect to the normal direction of the reflection surface sheet. The illuminating system according to any one of claims 6 to 8, wherein an imaginary straight line extending in a direction inclined by 50 ° to the other side does not intersect the reflecting surface at other positions.   The illumination system according to any one of claims 2 to 9, wherein the reflection surface forms an incident surface of the reflection sheet with respect to light from the light source.   The angle of the reflection surface of the reflection part changes so as to gradually increase from one side to the other side in the first direction within an angle range including a range of at least 0 ° to 20 °, or at least 2. The illumination system according to claim 1, wherein the illumination system changes so as to gradually decrease from the one side to the other side in the first direction within an angle range including a range of 0 ° to 20 °.   The illumination system according to claim 11, wherein the light source is disposed on the one side in the first direction with respect to the plurality of unit reflection surfaces.   In the main cut surface, the unit reflection surface passes through a position where the reflection surface angle is 20 ° and is inclined by 41 ° to one side in the first direction with respect to the normal direction of the reflection sheet. The illuminating system according to claim 11 or 12, wherein an imaginary straight line extending in a direction does not intersect the reflecting surface at other positions.   In the main cut surface, it passes through a position where the reflection surface angle of one unit reflection surface is 0 ° and is inclined by 31 ° to one side in the first direction with respect to the normal direction of the reflection surface sheet. The illuminating system according to any one of claims 11 to 13, wherein an imaginary straight line extending in the selected direction does not intersect the reflecting surface at other positions. Each unit reflection surface is
The reflection surface angle changes so as to gradually increase from one side to the other side in the first direction within an angle range including a range of at least 0 ° to 20 °, or at least 0 ° to 20 °. A first reflecting portion that changes so as to gradually become smaller from the one side to the other side in the first direction within an angle range including a range of less than or equal to °.
The reflection surface angle changes so as to gradually increase from one side to the other side in the first direction within an angle range including at least a range of −20 ° to 0 °, or at least −20 °. A second reflecting portion that changes so as to gradually become smaller from the one side to the other side in the first direction within an angle range including the range of 0 ° or less; and
The lighting system according to claim 1, comprising:   The light source is disposed on the one side in the first direction with respect to the plurality of unit reflection surfaces and on the other side in the first direction with respect to the plurality of unit reflection surfaces. 16. A lighting system according to claim 15, comprising a second light source. In the main cut surface, the unit reflecting surface passes through a position where the reflecting surface angle of the first reflecting portion is 20 ° and is in the first direction with respect to the normal direction of the reflecting surface sheet. An imaginary straight line extending in a direction inclined by 41 ° to one side does not intersect the reflective surface at other positions,
In the main cut surface, the first direction with respect to the normal direction of the reflecting surface sheet passes through a position where the reflecting surface angle of the second reflecting portion of one unit reflecting surface is −20 °. The illuminating system according to claim 15 or 16, wherein an imaginary straight line extending in a direction inclined by 41 ° to the other side of the light does not intersect the reflecting surface at other positions. In the main cut surface, the unit reflecting surface passes through a position where the angle of the reflecting surface of the first reflecting portion is 0 ° and is in the first direction with respect to the normal direction of the reflecting surface sheet. An imaginary straight line extending in a direction inclined by 31 ° to one side does not intersect the reflective surface at other positions,
In the main cut surface, the unit reflection surface passes through a position where the reflection surface angle of the second reflection part is 0 ° and is in the first direction with respect to the normal direction of the reflection surface sheet. The illuminating system according to any one of claims 15 to 17, wherein an imaginary straight line extending in a direction inclined at 31 ° to the other side does not intersect the reflecting surface at other positions. The reflective sheet has a transparent layer covering the reflective surface,
The said transparent layer is an illumination system as described in any one of Claims 11-18 which makes the entrance plane of the said reflection sheet with respect to the light from the said light source. A connection surface is provided between two unit reflection surfaces adjacent in the first direction,
The illumination system according to any one of claims 1 to 19, wherein a regular reflectance at the connection surface is lower than a regular reflectance at the unit reflective surface.   The illumination system according to claim 20, wherein the connection surface is formed as an uneven surface. A connection surface is provided between two unit reflection surfaces adjacent in the first direction,
The lighting system according to any one of claims 1 to 19, wherein an absorptance at the connection surface is higher than an absorptance at the unit reflecting surface. A connection surface is provided between two unit reflection surfaces adjacent in the first direction,
The illumination system according to any one of claims 1 to 19, wherein the connection surface is patterned. A reflective surface including a plurality of unit reflective surfaces arranged in a first direction and extending in a second direction each intersecting the first direction;
Each unit reflection surface changes so that the reflection surface angle gradually increases from one side to the other side in the first direction, or gradually from the one side to the other side in the first direction. Including a reflective part that changes to become smaller,
Here, the angle of the reflection surface is such that a direction perpendicular to the unit reflection surface is a normal direction of the reflection sheet in a main cut surface parallel to both the first direction and the normal direction of the reflection sheet. A reflection angle having a positive angle value when a direction orthogonal to the unit reflection surface in the main cut surface is inclined to the one side in the first direction with respect to a normal direction of the reflection sheet. Sheet.

Images