JP2019186006A - Indirect lighting system - Google Patents

Abstract

To provide an indirect lighting system of this invention in which improved light source non-perceptibility, a wide range lighting characteristic, a luminosity variation slow characteristic and a light source mounting easiness can be attained by activating a feature of a planar light source as compared with that of the prior art indirect lighting.SOLUTION: An indirect lighting system of this invention comprises an opposing surface having a flat surface area opposing against an object surface to be indirect lighting and several flat light sources that are arranged in said flat surface area, said opposing surfaces have an open side perpendicular to said opposing direction. Said opposing surface has an open side perpendicular to said opposing direction, the side of said open has a shading part raised in height H from said open side to said opposing direction, said planar light source is a planar light source including a rectangular light generating area having a length in a direction perpendicular to said open side, the planar light source is arranged in a height h from said planar area is characterized in that a port spacing that is a distance against said indirect lighting object surface in said opposite direction at said shading part is defined as G and further these values fulfill the specified relation.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an indirect lighting system, and more particularly to an indirect lighting system including a plurality of planar light sources.

  In recent years, flat light sources typified by organic EL panels have attracted attention as a light source to replace incandescent lamps and fluorescent lamps, and many studies have been made.

  Represented by such an organic EL panel, in addition to an indirect illumination system using a planar light source as a light source, such as an LED panel produced by arranging LEDs in a plane or combining an LED and a diffusion plate However, a system that makes full use of the characteristics of a flat light source has not been developed yet.

  For example, Patent Document 1 discloses that a lighting fixture that emits uniform light on a ceiling or floor surface and performs indirect illumination with good appearance is provided on the upper surface of the top plate or the lower surface of the bottom plate of the storage furniture. Although it is disclosed that a light-emitting panel having elements is integrally provided to emit light without requiring a shielding member or the like for concealing the light source, the indirect illumination with good appearance is disclosed. As a control method, it is proposed that the light distribution control sheet is arranged on the light exit surface of the light-emitting panel. Although the panel itself is used as a shielding member, the features of the planar light source are positively high-quality. It is not connected to indirect lighting.

  Patent Document 2 discloses an indirect lighting device that does not require complicated work such as digging the ceiling surface, does not impair the aesthetics, and can be easily attached to a wall joint. An extension material extending along the indoor side, a hanging material that hangs down from the indoor side end portion of the extending material, and a light emitting panel provided with a light emitting surface facing the wall surface on the wall surface side of the hanging material Disclosed is an indirect lighting device composed of a light emitting unit that can be easily mounted, but in order to reflect it effectively on the wall surface, an inclined surface is formed so that the mounting surface moves away from the wall surface in the downward direction of the hanging material. It is suggested that the light-emitting panel, which is a flat light source, is an obstacle to effectively reflecting it on the wall surface as it is. Product features It does not lead to to high-quality indirect lighting.

JP 2012-142202 A JP 2008-078062 A

  In Patent Document 1 described above, a light emitting panel is integrally provided on the upper surface of the top plate or the lower surface of the bottom plate of the storage furniture to irradiate the ceiling or floor surface with uniform light while hiding the light source. The light is irradiated to the part facing the light-emitting panel, hardly touching the human eye, hidden in the furniture on the ceiling or floor, even if the light distribution control of the emitted light is devised. The efficiency of indirect lighting with respect to electric power is low. On the other hand, there is a high possibility that indirect lighting with poor comfort that makes the room feel dim is desired, and further improvement is desired.

  Moreover, the above-mentioned patent document 2 discloses an indirect lighting device including a light emitting panel provided with a light emitting surface facing the wall surface on the wall surface side of the hanging material, and does not require complicated work such as digging the ceiling surface. However, it is necessary to newly install the extension material and the hanging material on the ceiling and the wall surface, and it does not necessarily impair the aesthetics, and the features of the flat light source are fully utilized to hide the light source. This is especially true when the mounting surface is an inclined surface that moves away from the wall surface in the downward direction of the drooping material. The panel may be visually recognized from the outside, and the appearance may be inferior. It is difficult to say that indirect lighting with improved comfort while improving the efficiency of indirect lighting with respect to electric power can be realized by taking advantage of the features of a flat light source, and there is room for improvement.

  The present invention has been made to solve the problems of the prior art, and by utilizing the features of a flat light source, it is improved compared to conventional indirect illumination using a conventional light source such as a fluorescent lamp or LED. It is an object of the present invention to provide indirect illumination that can provide light source non-visibility, wide-area illumination, brightness change slowness, and light source installation ease.

  As a result of intensive studies in view of the above problems, the present inventors have found that the above-described problems can be solved by using an indirect illumination system including a planar light source having a specific arrangement, and have completed the present invention.

That is, the present invention is an indirect illumination system that indirectly illuminates a target surface for indirect illumination,
An opposing surface having a planar area facing the indirect illumination target surface, and a plurality of planar light sources arranged in the planar area,
The facing surface is an opening side perpendicular to the facing direction, and has an opening side included in the surface to be indirectly illuminated in plan view in the facing direction, and further, the opening side near the opening side. A light-shielding portion having a length X rising in the opposite direction at a height H and parallel to the opening side,
The planar light source is a planar light source having a length Lx in a direction parallel to the opening side, including a rectangular light emitting region whose length in the direction perpendicular to the opening side is y, and has a height h from the planar region. A planar light source arranged within,
The present invention relates to an indirect illumination system in which an opening interval which is a distance from the indirect illumination target surface in the facing direction in the light shielding portion is G, and further satisfies all of the following Equations 1 and 2.

  In the present invention, the planar light source is preferably an organic EL panel, and its thinness and lightness and the characteristic of emitting soft diffused light with a gentle in-plane distribution are utilized.

  In such an indirect illumination system of the present invention, the light source non-visibility is improved by installing a thin flat light source on the opposite surface, and the wide range illumination property and the brightness change graduality are improved based on the surface light emission by the surface light source. Excellent light source installation ease.

  In addition, y is preferably larger than G, and the light source non-visibility is further improved, and the thin characteristics of the planar light source are utilized to the fullest, and the effects of the present invention can be more effectively exhibited. In addition, it can be easily attached and detached during maintenance of the flat light source, and since it becomes an indirect lighting system that supplies light from a narrower space, it gives a completely different impression from the indirect lighting system using a conventional light source. A new light space can be realized.

  Moreover, it is preferable that the said light-shielding part contains the curved surface convex toward the said indirect illumination object surface, and can perform indirect illumination more broadly and the brightness change more gradually.

  The plurality of planar light sources arranged in parallel are preferably arranged in parallel to the opening side, and can be indirectly illuminated with a cheaper planar light source over a longer distance. It is preferable to use a planar light source including the rectangular light emitting region having a side parallel direction length x, more preferably an organic EL panel, and a distance D between adjacent rectangular light emitting regions is preferably 20 mm or less. More uniform indirect illumination is possible along the opening side.

  In addition, it preferably includes a planar light source module that includes the planar light source and a part of the light shielding portion corresponding to the planar light source, and more preferably corresponds to the organic EL panel and the organic EL panel. By including an organic EL module including a part of the light-shielding portion, an indirect illumination system that can be installed inexpensively and easily can be obtained.

  The indirect illumination system of the present invention is excellent in light source non-visibility, wide range illumination, brightness change slowness, and light source installation ease.

It is a section conceptual diagram of one embodiment explaining the indirect lighting system of the present invention. It is the cross-sectional structure (left) explaining the indirect illumination system 100 of Example 1, and the result (right) of the brightness distribution. It is the cross-sectional structure (left) explaining the indirect illumination system of the comparative example 1, and the result (right) of the brightness distribution. It is the cross-sectional structure (left) explaining the indirect illumination system of the comparative example 2, and the result (right) of the brightness distribution. It is the cross-sectional structure (left) explaining the indirect illumination system of the comparative example 3, and the result (right) of the brightness distribution. It is the cross-sectional structure (left) explaining the indirect illumination system 100 of Example 2, and the result (right) of the brightness distribution. It is the installation condition photograph of the organic EL panel 1 in the groove-shaped installation part of the actual system of the indirect illumination system 100 of Example 2. FIG. It is sectional structure (left) explaining the indirect illumination system 100 of Examples 1-3, and the result (right) of those brightness distributions, the upper stage is Example 1, the middle stage is Example 2, and the lower stage is Example 3. It is. It is a cross-sectional structure (left) explaining the indirect illumination system 100 of Example 4, and the result (right) of the brightness distribution. It is a cross-sectional structure (left) explaining the indirect illumination system 100 of Example 5, and the result (right) of the brightness distribution. It is the cross-sectional structure (left) explaining the indirect illumination system 100 of Example 6, and the result (right) of the brightness distribution. It is the cross-sectional structure (left) explaining the indirect illumination system 100 of Example 7, and the result (right) of the brightness distribution. It is the installation condition photograph of the organic EL panel 1 in the groove-shaped installation part of the actual system of the indirect illumination system 100 of Example 7. FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Indirect lighting system 100)
FIG. 1 is a conceptual cross-sectional view of an embodiment illustrating an indirect lighting system of the present invention.

  The indirect illumination system 100 of the present invention is a system for indirectly illuminating the indirect illumination target surface 3. The indirect illumination target surface 3 is opposed to the indirect illumination target surface 3, preferably in parallel with the opening interval G, and the opposing surface 2. Indirect illumination that includes a plurality of arranged planar light sources 1, preferably a planar light source module 10, and that emits light by an electric power supply in a light emitting region 11 included in a light emission main surface of the planar light source 1. In this system, the target surface 3 is illuminated indirectly.

  In the indirect illumination system 100 of the present invention, the facing surface 2 is an opening side 22 perpendicular to the facing direction toward the indirect lighting target surface 3, and the opening included in the indirect lighting target surface 3 in a plan view in the facing direction. A light shielding portion 23 having a length X that rises from the opening side 22 in the opposite direction at a height H and is parallel to the opening side 22 in the vicinity of the opening side 22. The planar light source 1 is a planar light source having a length Lx in a direction parallel to the opening side 22 including the light emitting region 11 whose length in the direction perpendicular to the opening side 22 is y. The planar light source 1 is arranged within a height h, and an opening interval that is a distance from the indirect illumination target surface 3 in the facing direction in the light shielding portion 23 is G. Further, the following Equation 1 and Equation One feature is an indirect lighting system that satisfies all 2

  The indirect illumination system 100 of the present invention has improved light source invisibility by including the planar light source 1 and the light shielding part 23 having a thickness smaller than h as compared with the conventional indirect illumination. In spite of being included, the flat light source 1 is used as a light source, and thus has a wide range illumination property, brightness change gradualness, and light source installation ease, and is shorter than the light shielding portion 23 having a length X. By including a plurality of flat light sources 1 having a length of Lx, an inexpensive system using an inexpensive light source is provided, and the light source can be installed more easily.

  As described above, since the light emitting main surface faces the indirect illumination target surface 3 so as to emit light, the back main surface that is the surface opposite to the light emitting main surface of the flat light source 1 is It will be placed so as to be in direct or indirect contact with the planar region 21 included in the facing surface 2.

  The opening gap G is preferably 50 mm or more and 500 mm or less, more preferably 75 mm or more and 400 mm or less, and more preferably 100 mm or more and 200 mm or less from the viewpoint of effectively achieving the effects of the present invention. Is more preferable.

(Indirect lighting target surface 3)
The indirect illumination target surface 3 according to the present invention may be a surface of a simple decorative member, but is generally a surface of a structure, preferably a building interior or exterior surface, and more Preferably, it is a ceiling, a wall surface, and a floor surface inside the building, more preferably an indoor ceiling and a wall surface, and particularly preferably corresponds to a raised surface relating to a raised ceiling and a curtain surface of a curtain box. It is a curtain surface, a wall surface, and a window, and the effects of the present invention can be exhibited effectively.

(Opposing surface 2)
The facing surface 2 according to the present invention is one main surface of the facing surface member 20 having a planar region 21 where a plurality of planar light sources 1 are arranged, and faces the indirect illumination target surface 3, preferably in parallel. For example, although it is not necessary to be directly and indirectly physically fixed to the indirect illumination target surface 3, it is preferably fixed to the indirect illumination target surface 3.

  The facing surface 2 according to the present invention includes the planar region 21, the opening side 22, and the light shielding portion 23, and the opening side 22 is perpendicular to the facing direction to the indirect illumination target surface 3, and the facing direction The planar region 21 is preferably a planar region having a height of 0 in the opposite direction from the opening side 22 and the light shielding portion 23 is included in the opening side 22. And the portion sandwiched between the planar regions 21.

  The facing surface member 20 can be constituted by a material such as metal, resin, wood, bamboo, or a combination of these materials.

(Shading part 23)
The light-shielding portion 23 according to the present invention is a portion sandwiched between the opening side 22 and the planar region 21 in the vicinity of the opening side 22 and has a height H in the facing direction from the opening side 22 to the indirect illumination target surface 3. , A portion that rises with a length X parallel to the opening side 22.

  The height H may be the highest height in all the light shielding portions 23, but preferably the highest point in the cross section of the light shielding portion 23 in the direction perpendicular to the X direction is connected to the X direction. It is at least the highest height of the line segment, more preferably an average value of the line segment, and more preferably, the height H is a constant value in the entire region of the line segment. The light source non-visibility effect of the present invention can be exhibited with an appearance and at low cost.

  The light-shielding portion 23 according to the present invention preferably includes a curved surface that is convex toward the indirect illumination target surface 3 from the viewpoint of more effectively exhibiting the wide-range illumination effect and the brightness change gradual effect of the present invention. From the viewpoint of having a beautiful appearance and an inexpensive counter surface member 20, it is more preferable that the cross section of the light shielding portion 23 in the direction perpendicular to the X direction includes a semicircle.

  The height H is preferably 2 mm or more and 200 mm or less, more preferably 10 mm or more and 100 mm or less, and 20 mm or more and 80 mm or less from the viewpoint of effectively achieving the effects of the present invention. Is more preferable.

  The length X is preferably 100 mm or more, more preferably 300 mm or more and 100 m or less, from the viewpoint of realizing a comfortable light space as indirect lighting and the effect of the present invention effectively. Preferably, it is 1 m or more and 30 m or less.

(Plane light source 1)
A plurality of planar light sources 1 according to the present invention are arranged in a planar region 21, preferably parallel to the opening side 22, more preferably in a line along the direction of the length X, and the indirect illumination system of the present invention. 100, which may be fixed by screws or adhesives, but from the viewpoint of ensuring maintainability, the engaging portion is provided in the planar region 21 and the planar light source 1. It is also a preferred embodiment that the engaging portion includes a power feeding path, and a pedestal module in which a plurality of planar light sources 1 are engaged on one pedestal is planar. Installation in the region 21 is also a preferred embodiment, and it is also a preferred embodiment that a rail member such as a duct rail is used so that position adjustment and power feeding can be performed.

  The planar light source 1 according to the present invention has an outer shape in which the length in the direction parallel to the opening side 22 is Lx, the length in the direction perpendicular to the opening side 22 is Ly, and preferably the thickness is h. The plate-like member is preferably provided with a rectangular surface. From the viewpoint of ensuring handleability, Lx is preferably 40 mm or more and 2 m or less, more preferably 80 mm or more and 1 m or less, from the viewpoint of ensuring a comfortable light space in addition to the viewpoint of ensuring handleability, Ly is preferably 5 mm or more and 1 m or less, more preferably 20 mm or more and 500 mm or less, and h is preferably 0.2 mm or more and 50 mm or less, more preferably 1 mm or more and 20 mm or less, and further preferably 2 mm or more and 10 mm or less. .

  In the arrangement, the planar light source 1 according to the present invention has an outer shape in which the length in the direction parallel to the opening side 22 is x and the length in the direction perpendicular to the opening side 22 is y. From the viewpoint of the flat light source 1 that is preferably rectangular and has a simple configuration and is inexpensive, it preferably has one light emitting region 11. In other words, it is preferable that the light emitting main surface has a frame area surrounding the one light emitting area 11. The average width w of such a frame region is preferably 0.1 mm or more and 50 mm or less, more preferably 0.5 mm or more and 10 mm or less, and more preferably 1 mm or more from the viewpoint of providing a bright planar light source 1 with high reliability. 5 mm or less is more preferable.

  That is, the planar light source 1 according to the present invention is preferably a long rectangular light emitting region 11 having a long length with respect to the width and a long rectangular panel having an outer shape.

  It is uniform indirect that such a planar light source 1 is disposed in the planar region 21 so as to include a distance D between adjacent light emitting regions 11 that is, for example, twice the length of w and is 200 mm or less. This is preferable from the viewpoint of illumination.

  Such a flat light source 1 may be the LED panel 1, but it is also possible to improve the light source non-visibility, the wide range illumination, and the brightness change grading according to the present invention, soft light, and comfortable light. From the viewpoint of indirect illumination by the organic EL panel 1, the organic EL panel 1 is preferable.

  The length y, that is, the length of the light emitting region 11 in the direction perpendicular to the opening side 22 is larger (longer) than the opening gap G, that is, the distance from the indirect illumination target surface 3 in the opposite direction in the light shielding portion 23. The light source invisibility according to the present invention can be further improved while maintaining the light source installation ease according to the present invention. In that case, the planar light source 1 can be manufactured particularly thinly, even in a narrow space. The organic EL panel 1 is preferably easy to install.

(Organic EL panel 1)
The organic EL panel 1 according to the present invention is a plate-like member that emits light from a light emitting region 11 included in the light emitting main surface, with the light emitting main surface and the back main surface as both main surfaces. You may have.

  The organic EL panel 1 according to the present invention is preferably a panel including a laminated structure including a transparent substrate, an organic EL element, and a sealing structure from the light emitting main surface to the back main surface. By making it an emission type panel, it is possible to give a high mechanical strength to the light emitting main surface exposed to the outside, and more preferably, it is a panel including only one organic EL element as a single light emitting device. Since no internal wiring is required, the area efficiency, which is the area ratio of the light emitting region 11 on the light emitting main surface, is high, and the panel is inexpensive.

  The organic EL panel 1 will be described in detail as follows.

  First, the above-mentioned “panel including only one organic EL element” specifically refers to an equipotential electrode layer that is directly fed from the outside of the panel. It is a panel including only elements that are only one set of cathode layers.

  The transparent substrate is preferably a substrate made of glass or resin having translucency and insulation properties, from the viewpoint of easily constructing a highly reliable bottom emission type organic EL panel 1. From the viewpoint of making a highly reliable panel by preventing moisture ingress into the organic EL panel, a glass substrate is more preferable, and from the viewpoint of making a panel with less cracking and chipping while ensuring thinness and lightness, its thickness is The average value is preferably 0.1 mm or more and 10 mm or less, and more preferably 0.2 mm or more and 5 mm or less. Further, the flexibility can be about 150 mmR or less, preferably about 75 mmR or less, for both a panel and a substrate.

  The organic EL element includes a light-transmitting conductive film, a light-emitting layer containing an organic compound, and an organic functional film in which a plurality of thin films are stacked, and a reflective conductive film are sequentially formed, and these films are superimposed. Each of the three films formed as a part and included in the overlapping part is a translucent anode layer, an organic functional layer, and a reflective cathode layer. Preferably, the translucent anode layer is provided on the transparent substrate side. It is formed. Such an organic EL element emits light when a current flows through the organic functional layer sandwiched between these overlapping portions in accordance with voltages applied to the light-transmitting anode layer and the reflective cathode layer.

A transparent conductive oxide is preferably employed as the material of the light-transmitting conductive film, and among them, indium tin oxide (ITO), indium zinc oxide (IZO), tin oxide (SnO2), zinc oxide (ZnO). And highly transparent ITO or IZO that can effectively extract light is more preferable. Further, on such a transparent conductive oxide film, a film with a fine metal wire having a fine metal wire with a width of several tens of μm in length and breadth at intervals of about 1 mm, and the metal for preventing corrosion above or below, or above and below the metal wire A buffer layer with a thin metal wire layer, for example, a three-layer metal thin wire (MAM thin wire) of Mo alloy / Al alloy / Mo alloy, and an insulating film (for example, polyimide) wider than this on the metal thin wire It is preferable to use the light-transmitting conductive film as the insulating film with fine metal wires, even if it is the organic EL module 10 in the large area light emitting region 11 from the viewpoint of emitting light without uneven brightness.
In such a light emitting region 11, for example, both electrode sandwiching portions of the organic functional layer formed in the film opening portion of the transparent conductive oxide that do not have such a MAM / PI structure emit light. Such an organic EL panel 1 is preferably sealed with a sealing film in order to prevent moisture from entering from the outside, and more preferably light emission including the entire region of the organic EL panel 1 formation region in plan view. A sealing film is provided in a region including the entire region 11.

  Further, in the case of film sealing, in order to prevent scratches due to mechanical external force, it is preferable to attach a protective film made of PET or the like, more preferably a soaking sheet with an adhesive material. It is possible to prevent the occurrence of spots and sudden light emission stop.

  In such an organic EL panel 1 according to the present invention, in order to improve luminance, color, angle-dependent optical characteristics and light distribution, the outermost surface of the region including the light emitting region 11 of the light emitting main surface, for example, the above-mentioned It is preferable to provide an optical function body on the light emission side of the glass substrate.

  Examples of the optical functional body include lenses and prisms, such as lens sheets, prism sheets, or lenticular lens sheets. Nano-imprinted glass beads and glass beads coated with a resin made of acrylic or the like It is also possible to spray-coat or slit-coat a resin containing Preferably, a resin film (optical film) having a concavo-convex structure on one surface and an adhesive on the other surface is pasted on the glass surface so that the one surface becomes the outermost surface, Moreover, light scattering properties can also be imparted. Further, since the optical film is easily affixed to the surface of the film, depending on the case, it may be after the indirect lighting system 100 is assembled or before, and the organic EL module 10 according to the present invention to be described later may be used. It may be after attachment to the flat area 21.

(Planar light source module 10)
The planar light source module 10 according to the present invention includes a planar light source 1, preferably an organic EL panel 1, and a planar light source corresponding light shielding unit 13, preferably an organic EL panel corresponding light shielding unit 13, which is a part of the light shielding unit 23. . By using the planar light source module 10 including at least part of such a light shielding portion 13, the planar light source 1 according to the present invention can be easily and simply disposed on the opposing surface 2, and an inexpensive indirect illumination system. 100.

  Hereinafter, the present invention will be described specifically by way of examples. In addition, this invention is not limited to a following example, In the range which does not change the summary, it can change suitably and can implement.

(Production example of organic EL panel 1)
The organic EL panel 1 was produced by the following method.

  First, a 0.7 mm-thick glass substrate on which ITO is formed as a translucent conductive film is prepared. As an organic functional film on ITO, a hole injection layer 1, a hole transport layer 1, a light emitting layer 1, And the electron transport layer 1 are stacked to form a blue fluorescent light emitting unit, and then a connection layer is formed by sequentially stacking the electron injection layer 1, the electron transport intermediate layer, and the hole injection layer 2, and then Then, a green red phosphorescent light emitting unit is formed by laminating a hole transport layer 2, a light emitting layer 2, an electron transport layer 2, and an electron injection layer 2 in this order, and then a reflective conductive film made of aluminum is laminated. A white light-emitting organic EL device having high color rendering properties was formed.

  Thereafter, a silicon nitride film is formed by CVD, and further, polysilazane is applied by spraying and baked to form an inorganic sealing film, and a protective film made of PET with an adhesive is attached, and an organic EL tile is formed. Produced. The organic EL tile has an outer shape of 90 mm × 90 mm × 1.1 mmt and a light emitting area of 80 mm × 80 mm.

  Next, a double-sided tape with a size of 82 mm x 82 mm and a thickness of 50 μm is pasted on the protective film of the organic EL tile, ACF is pasted on the power feeding portion of the glass substrate, and the release paper of the double-sided tape is peeled off to form an FPC with a thickness of 180 μm. After fixing to the EL tile, the ACF connection part is thermocompression bonded, the FPC power supply wiring is formed, and the frame member (fixing member) is attached to the outer periphery, so that the Lx × Ly is 94 mm × 94 mm and the thickness is 1.1 mmt. A wired organic EL panel 1 was produced.

(Configuration of indirect lighting system)
The organic EL panel 1 (93 lumens / sheet) produced in this way and a linear LED light source module for indirect illumination (1000 lumens / piece) of 40 mm × 1500 mm × 40 mmt in which LED elements of point light sources are arranged in a straight line. The indirect lighting system of each of the following examples and comparative examples was configured.

  Here, as a basic policy of arrangement in the configuration of the indirect illumination system, an opening interval G is used as an opening for deriving light over a width of 5650 mm as a blind structure so that the light source cannot be seen from below the outside. Is provided at a position of 100 mm or 180 mm from the wall, and a groove-shaped installation portion is provided between the indirect illumination target surface 3 and the opposing surface 2, and the light source is arranged there. The total light quantity of the light source was about 3000 lumens or 4000 lumens. That is, when the organic EL panel 1 is used as the flat light source 1, 30 panels are arranged in a line, the total light amount is 2790 lumens, and when the indirect illumination linear LED light source module is used, three modules are linearly connected. The total amount of light was set to 3000 lumens.

Example 1
As a result of configuring the indirect illumination system of Example 1 having the cross-sectional structure shown in FIG. 2, the brightness distribution shown in FIG. 2 was obtained. In the indirect lighting system of Example 1, H is 40 mm, G is 140 mm, and h is 8 mm, and the brightness distribution is the ambient brightness including the pantry when observed in the direction of the thick arrow in the cross-sectional structure. The brightest horizontal line segment in the brightness distribution is the portion where the thick arrow intersects the indirect illumination target surface 3.

  In Example 1, 30 organic EL panels 1 are arranged in a line along the direction of the length X in the plane region 21 in parallel with the opening side 22.

  Specifically, the fixing member is a raised portion that is arranged on the back main surface side of the panel main body and protrudes toward the back main surface side, and protrudes in a direction perpendicular to the protruding direction. A plurality of raised portions including a plurality of joint portions are included, and two panel-side engaging portions among the plurality of panel-side engaging portions protrude in a direction away from each other. On the other hand, an attachment member having an attachment-side main body portion and a plurality of attachment-side engagement portions is fixed to the planar region 21. Of the plurality of attachment-side engagement portions, two attachment-side engagement portions extend from the attachment-side main body portion in directions close to each other. By sliding the organic EL panel 1 and engaging the two panel-side engagement portions and the two attachment-side engagement portions, the organic EL panel 1 is attached to the attachment member, so that the fixing member is interposed. In the plane region 21.

  In Example 1, the spread of light from the opening portion to the lower side was large, and the boundary between light and dark became soft and soft. The illuminance on the lower floor surface and the left and right wall surfaces were higher than those in the systems using the linear LED light source modules for indirect illumination in Comparative Examples 2 and 3 described later. Since the appliance is thin, the opening can be widened. As a result, even if the amount of light is smaller than that of the system using the LED light source module, the overall illuminance is increased.

(Comparative Example 1)
As a result of configuring the indirect illumination system of Comparative Example 1 having the cross-sectional structure shown in FIG. 3, the brightness distribution shown in FIG. 3 was obtained. In the indirect illumination system of Comparative Example 1, three linear LED light source modules for indirect illumination (y is 40 mm, x is 1450 mm) are used, and H is larger than that of Example 1 because the LED light source module is large and not hidden. The size is 55 mm, G is 125 mm, and h is 40 mm.

  As in the first embodiment, three LED light source modules are arranged in a line along the length X direction in the plane region 21 in parallel with the opening side 22, and the cross-sectional structure of FIG. The horizontal direction indicated by the thick arrow indicates the main light emission direction.

  In Comparative Example 1, a clear bright and dark boundary in which the vicinity of the opening is locally bright appears. Because of the thickness of the instrument, it was necessary to increase the blindfold and narrow the opening, so that the light use efficiency was low and the overall illuminance was lower than in Example 1.

  When Example 1 is compared with Comparative Example 1, by using the organic EL panel 1, it is possible to make light wrap around the entire space including other than the light source installation portion that is normally hidden, as compared with the LED light source module. Therefore, it turns out that a floor surface and a wall surface can be brightened effectively. In addition, the distribution in the vicinity of the opening can be expected to be implemented by light distribution control based on the opening width and the shape of the blindfold member, and the following example was tried.

(Comparative Example 2)
As a result of configuring the indirect illumination system of Comparative Example 2 having the cross-sectional structure shown in FIG. 4, the brightness distribution shown in FIG. 4 was obtained. In addition, the indirect illumination system of the comparative example 2 is the same as that of the comparative example 1 except having made the vertical direction shown by the very thick arrow of the cross-section of FIG. 4 into the main light emission direction.

  In Comparative Example 2, as compared with Comparative Example 1, the joint of the light distribution due to the arrangement of the lighting fixtures became inconspicuous, but only the vicinity of the opening became brighter and the overall illuminance was reduced. Moreover, there was no light wrapping around the left and right wall surfaces.

(Comparative Example 3)
As a result of configuring the indirect illumination system of Comparative Example 3 having the cross-sectional structure shown in FIG. 5, the brightness distribution shown in FIG. 5 was obtained. Note that the indirect illumination system of Comparative Example 2 is different from Example 1 in that the organic EL panel 1 is disposed on the indirect illumination target surface 3 instead of on the opposing surface 2 (reverse H), and the light shielding unit. 23 is different from the first embodiment in that the cross-section is a triangle instead of a rectangle. The other points are the same as those in the first embodiment. The reverse H is 63 mm, the depth of the groove-shaped installation portion is 180 mm, and G is 37 mm. .

  In Comparative Example 3, the aperture is narrowed for blinding, is dark except for the vicinity of the illumination installation position, and the brightness distribution is flat. However, when the aperture is increased to ensure illuminance, a linear light-dark boundary is clearly defined on the wall surface. The result that appears in.

(Example 2)
As a result of configuring the indirect illumination system of Example 2 having the cross-sectional structure shown in FIG. 6, the brightness distribution shown in FIG. 6 was obtained. FIG. 7 shows an installation state photograph of the organic EL panel 1 in the groove-shaped installation part of the actual system.

  The indirect illumination system of the second embodiment is different from the first embodiment in that the cross section of the light shielding portion 23 is not a rectangle but a quarter cylinder, and the other points are the same as the first embodiment. Yes, H is 40 mm, G is 140 mm, and the radius of the 1/4 cylinder is 40 mm.

  In Example 2, as compared with Example 1, the bright area at the exit of the opening spreads downward, the floor surface and the wall surface become brighter, the peak luminance in the field of view is suppressed, and the left and right wall surfaces also have light on the back side. Wrap around. By making the blindfold into a cylindrical shape, the change in illuminance near the opening becomes gentle and the boundary between light and dark is soft. In Example 2, the illuminance on the pantry wall at the back of the front is higher than in Example 1. Good results were obtained.

  When using a cylindrical blindfold, the illuminance change on the left and right wall surfaces becomes gentler and brighter downward as compared with the blindfold by a flat plate. Although the member cost is high, it is considered an effective means for expressing a smooth change in illuminance while suppressing the peak illuminance on the wall surface.

(Example 3)
FIG. 8 compares the cross-sectional structures of Examples 1 to 3 with the brightness distribution of these buildings. The upper part is Example 1, the middle part is Example 2, and the lower part is Example 3. That is, the center part of each brightness distribution as the building of FIG. 8 is enlarged in the room of FIG. 2 and FIG. Brightness distribution.

  The indirect illumination system of Example 3 in the lower part of FIG. 8 differs from Example 1 in that the cross section of the light-shielding portion 23 is not a rectangle, but a ½ cylinder, and is different from Example 1 in other points. Similarly, H is 30 mm, G is 150 mm, and the radius of the ½ cylinder is 30 mm.

  In Example 3, by using a 1/2 cylindrical surface, the light from the light source and the opposing wall surface is spread over a wide range and reflected, so that the wide range can be illuminated with bright and smooth illuminance changes. Therefore, it is considered an effective means for expressing a smooth change in illuminance. That is, by making the blindfold a cylindrical shape, the illuminance change in the vicinity of the opening becomes gentle, the boundary between light and dark becomes soft, and the illuminance on the pantry wall surface at the back of the front also increases.

Example 4
As a result of configuring the indirect illumination system of Example 4 having the cross-sectional structure shown in FIG. 9, the brightness distribution shown in FIG. 9 was obtained.

  In addition, the indirect illumination system of Example 4 is different from Example 1 in that the height H of the light-shielding portion 23 is as high as 55 mm, and is the same as Example 1 in other points. , H is 55 mm, and G is 125 mm.

  In Example 4, the opening is locally brightened, the illuminance of the pantry wall at the back of the front is darker than that of Example 2, and the light on the left and right wall surfaces also circulates to the back side. The result was inferior and overall darker than Example 1.

(Example 5)
As a result of configuring the indirect illumination system of Example 5 having the cross-sectional structure shown in FIG. 10, the brightness distribution shown in FIG. 10 was obtained.

  Note that the indirect illumination system of the fifth embodiment has a ¼ cylinder of the light shielding portion 23 on the upper side, which is the opposite side of the organic EL panel 1 with respect to the light shielding portion 23 of the facing surface 2, as compared with the second embodiment. A part of a cylinder similar to the symmetrical light-shielding part 23 is different in that it exists as a reflection part, and is the same as that of Example 2 in other points. H is 40 mm, G is 140 mm, and a 1/4 cylinder. The radius is 40 mm, and the radius of the upper partial cylinder is 100 mm.

  In the fifth embodiment, compared to the second embodiment, since the upper portion has a reflecting portion for diffusing light, the overall luminance is not necessarily bright, depending on the surface light diffusivity of the upper partial cylindrical member. Due to this, a shadow with a sense of incongruity occurred, which was impressively inferior to Example 2. That is, the illuminance distribution was flattened by the upper partial cylinder, but the floor surface illuminance and wall surface illuminance were dark. The light on the left and right walls also circulated to the back side.

(Example 6)
As a result of configuring the indirect illumination system of Example 6 having the cross-sectional structure shown in FIG. 11, the brightness distribution shown in FIG. 11 was obtained.

  In addition, the indirect illumination system of Example 6 is different from Example 5 in that the height H of the light shielding portion 23 is as high as 55 mm, and is the same as that of Example 5 in other points. That is, a part of the cylinder is present as a reflection part on the upper side, which is the part opposite to the light shielding part 23 of the facing surface 2 with the organic EL panel 1 in between, as in Example 5, and H is 55 mm and G is 125 mm. The radius of the upper partial cylinder is 100 mm.

  In Example 6, the opening portion was locally brightened, the illuminance on the floor surface was darker than in Example 7, and the left and right wall surfaces resulted in light going into the back side.

(Example 7)
As a result of configuring the indirect illumination system of Example 7 having the cross-sectional structure shown in FIG. 12, the brightness distribution shown in FIG. 12 was obtained. An installation state photograph of the organic EL panel 1 in the groove-shaped installation part of the actual system is shown in FIG.

  The indirect lighting system of Example 7 is compared with Example 4 in that the upper side of the panel is tilted 15 degrees from the vertical and the light shielding part 23 is a shielding plate, and its tip is 30 degrees above the horizontal. The difference is that the structure is lifted, and the other points are almost the same as those of the fourth embodiment. H is 60 mm and G is 120 mm.

  In Example 7, it corresponds to arranging the organic EL panel 1 obliquely, and it is necessary to narrow an effective opening to conceal the organic EL panel 1, so that the light shielding plate is also obliquely installed so that the opening can still be enlarged. The illuminance in the room will be low, and the light from the reflection will not come out due to the oblique installation of the light-shielding plate, so the opening will be locally bright, and the pantry wall at the back of the front will be dark and light will circulate to the back side. Although the result was widely illuminated, it was found that basically no light wraps around the part other than the opening. Although the structure of Example 7 can be used to limit the light wraparound range, it is necessary to reduce the opening that greatly reduces the light use efficiency. Conceivable. However, from the viewpoint of realizing beautiful and comfortable indirect lighting, there are cases where it can be adopted.

  Although the wall surface was dark, it was widely lit, and the wall surface was also exposed to light.

  From the results of the above examples and comparative examples, when compared with the linear LED light source module for indirect illumination with respect to the validity of indirect illumination by the organic EL panel 1, the entire space including the light source installation part that is normally hidden is generally included. Since the light can be circulated, the floor and wall surface can be effectively brightened, and the distribution in the vicinity of the opening can be used for the light distribution control by the opening width and the shape of the blindfold member. The superiority of the planar light source, particularly the superiority of the organic EL panel, was confirmed.

100 Indirect lighting system 10 Planar light source module (LED module, organic EL module)
1 Planar light source (LED panel, organic EL panel)
DESCRIPTION OF SYMBOLS 11 Rectangular light emission area | region 13 Flat surface light source corresponding light-shielding part 2 Opposite surface 20 Opposite surface member 21 Plane area 22 Opening side 23 Light-shielding part 3 Indirect illumination object surface

Claims (5)

An indirect lighting system for indirectly illuminating a surface to be indirectly illuminated,
An opposing surface having a planar area facing the indirect illumination target surface, and a plurality of planar light sources arranged in the planar area,
The facing surface is an opening side perpendicular to the facing direction, and has an opening side included in the surface to be indirectly illuminated in plan view in the facing direction, and further, the opening side near the opening side. A light-shielding portion having a length X rising in the opposite direction at a height H and parallel to the opening side,
The planar light source is a planar light source having a length Lx in a direction parallel to the opening side, including a rectangular light emitting region whose length in the direction perpendicular to the opening side is y, and has a height h from the planar region. A planar light source arranged within,
An indirect illumination system in which an opening interval, which is a distance from the indirect illumination target surface in the facing direction in the light shielding portion, is G, and further satisfies all of the following Equations 1 and 2.

  The indirect lighting system of claim 1, wherein y is greater than G.   The indirect illumination system according to claim 1, wherein the light shielding unit includes a curved surface that is convex toward the indirect illumination target surface.   The plurality of planar light sources arranged in plurality is an organic EL panel including the rectangular light emitting region in which a plurality of planar light sources are arranged in parallel to the opening side and the length in the opening side parallel direction is x. The indirect illumination system according to any one of claims 1 to 3, wherein a distance D between the rectangular light emitting regions is 200 mm or less.   The indirect illumination system according to claim 4, comprising an organic EL module including the organic EL panel and a part of the light-shielding portion corresponding to the organic EL panel.