JP7253155B2 - Light emitting device, assembly kit, building material panel, structure, and method for manufacturing structure - Google Patents

Description

The present invention relates to a light-emitting device that emits light, an assembly kit for the light-emitting device, a building material panel or structure including the light-emitting device or the assembly kit, and a method for manufacturing the structure.

Light-emitting devices that emit light are widely used in various fields. For example, Patent Literature 1 discloses an example in which a light emitting device is used as a lighting device. The light-emitting device of Patent Document 1 is used as an indirect lighting device that irradiates light toward the decorative surface of a ceiling, wall, or the like, which is a structural body. According to such an indirect lighting device, the light from the light source, which is hidden and cannot be directly recognized, is irradiated not to the space but to the structure that defines the space, thereby emphasizing the expanse of the space. can do.

JP 2011-210594 A

However, in the light-emitting device disclosed in Patent Literature 1, the housing that houses the light source protrudes into the space. Therefore, although the light source is hidden and made invisible, the presence of the light source can be easily grasped. For this reason, conventional light-emitting devices have not gone beyond the realm of devices that artificially illuminate the decorative surfaces of structures, and have not been able to sufficiently produce and enhance the atmosphere of a space.

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above points, and an object of the present invention is to realize lighting that can effectively produce the atmosphere of a space.

A light-emitting device according to the present disclosure includes:
a surface light source device having a light emitting surface;
a decorative sheet including a light-emitting region facing the light-emitting surface and a non-light-emitting region adjacent to the light-emitting region;

A light-emitting device according to the present disclosure includes:
a surface light source device having a light emitting surface;
a decorative sheet arranged so as to partially face the light emitting surface.

In the light emitting device according to the present disclosure,
At least one of the amount of light emitted from the light emitting surface and the transmittance of the decorative sheet changes along one axis,
The light-emitting region and the non-light-emitting region may be arranged in the uniaxial direction.

In the light emitting device according to the present disclosure,
the amount of light emitted from a certain position on the light emitting surface is smaller than the amount of light emitted from a certain other position on the light emitting surface located on one side of the position in the uniaxial direction;
The non-light-emitting region may be adjacent to the light-emitting region from the other side in the uniaxial direction.

In the light-emitting device according to the present disclosure, the amount of light emitted from an arbitrarily selected position on the light-emitting surface is equal to or less than the amount of light emitted from other positions on the light-emitting surface located on one side of the position in the one-axis direction. You may do so.

In the light emitting device according to the present disclosure,
The surface light source device has a light guide plate and a light source facing the light guide plate from one side in a uniaxial direction,
The non-light-emitting region may be adjacent to the light-emitting region from the other side in the uniaxial direction.

In the light emitting device according to the present disclosure, the light guide plate may include a reflecting portion having visible light reflectivity or an absorbing portion having visible light absorption in the end region that is the other side in the uniaxial direction. good.

In the light emitting device according to the present disclosure,
The surface light source device includes a plurality of light emitters arranged in a uniaxial direction,
The luminous flux of a certain luminous body is lower than the luminous flux of another luminous body located on one side of the one luminous body in the uniaxial direction,
The non-light-emitting region may be adjacent to the light-emitting region from the other side in the uniaxial direction.

In the light-emitting device according to the present disclosure, the emitted light flux [lm] of one arbitrarily selected light emitter is the emitted light flux of another light emitter located on one side of the one light emitter in the one axial direction. [lm] or less.

In the light emitting device according to the present disclosure,
The visible light transmittance of the decorative sheet at a certain position is lower than the visible light transmittance of the decorative sheet at another position located on one side of the position in the uniaxial direction,
The non-light-emitting region may be adjacent to the light-emitting region from the other side in the one-axis direction.

In the light emitting device according to the present disclosure, the visible light transmittance of the decorative sheet at an arbitrarily selected position is the visible light transmittance of the decorative sheet at another position located on one side in the uniaxial direction from the position. You may make it below a ratio.

In the light-emitting device according to the present disclosure, the illuminance X [lx] due to the light emitted from the light-emitting surface at any peripheral edge of the light-emitting surface, and the decorative sheet at a position facing the peripheral edge of the light-emitting surface The visible light transmittance T [%] and the visible light reflectance R [%] of may satisfy the following formula (A).
1≦(X×T+300×R)/(300×R)<1.1 (A)

In the light-emitting device according to the present disclosure, the illuminance X [lx] caused by the light emitted from the light-emitting surface at any peripheral edge of the light-emitting surface and the peripheral edge of the light-emitting region facing the peripheral edge of the light-emitting surface visible light transmittance T ₁ [%] of the decorative sheet at, visible light reflectance R ₁ [%] of the decorative sheet at the peripheral edge of the light emitting area, and adjacent to the peripheral edge of the light emitting area The visible light reflectance R ₂ [%] of the decorative sheet at the periphery of the non-light-emitting region may satisfy the following formula (B).
1≦(X×T ₁ +300×R ₁ )/(300×R ₂ )<1.1 (B)

The light-emitting device according to the present disclosure may further include a board arranged facing at least the non-light-emitting region.

In the light-emitting device according to the present disclosure, the light-emitting surface of the surface light source device may be positioned on the same plane as the surface of the board facing the non-light-emitting region.

In the light emitting device according to the present disclosure,
The board is arranged facing both the non-light-emitting area and the light-emitting area,
The board may be provided with a recess for accommodating the surface light source device at a position facing the light emitting area.

In the light emitting device according to the present disclosure,
The surface light source device includes a main surface including the light emitting surface and a side surface adjacent to the main surface,
The decorative sheet may be arranged facing the main surface and the side surface of the surface light source device.

In the light emitting device according to the present disclosure, the area of the light emitting region of the decorative sheet may be 15% or less of the total area of the decorative sheet.

In the light-emitting device according to the present disclosure, the decorative sheet may be installed on a wall of a room, and the area of the light-emitting region of the decorative sheet may be 15% or less of the total area of the wall.

An assembly kit according to the present disclosure includes:
An assembly kit for use in any of the light emitting devices according to the present disclosure described above,
the decorative sheet;
and an optical member forming the light emitting surface.

A building panel according to the present disclosure comprises any light emitting device according to the present disclosure described above or any assembly kit according to the present disclosure described above.

A structure according to the present disclosure comprises any building panel according to the present disclosure described above.

A method of manufacturing a structure according to the present disclosure includes the step of installing any assembly kit according to the present disclosure described above.

ADVANTAGE OF THE INVENTION According to this invention, the atmosphere of space can be produced effectively.

FIG. 1 is a diagram for explaining an embodiment, and is a perspective view showing a lighting system. 2 is a longitudinal sectional view of FIG. 1. FIG. 3 is a front view showing a light emitting device included in the lighting system of FIG. 1. FIG. FIG. 4 is a longitudinal sectional view showing a specific example of a surface light source device of the light emitting device included in the lighting system of FIG. FIG. 5 is a view corresponding to FIG. 4 and a longitudinal sectional view showing another specific example of the surface light source device. FIG. 6 is a view corresponding to FIG. 4 and a longitudinal sectional view showing still another specific example of the surface light source device. 7 is a longitudinal sectional view showing an enlarged part of a light emitting device included in the lighting system of FIG. 1. FIG. FIG. 8 is a view corresponding to FIG. 4 and a longitudinal sectional view showing still another specific example of the surface light source device. FIG. 9 is a view corresponding to FIG. 4 and a longitudinal sectional view showing still another specific example of the surface light source device. FIG. 10 is a view corresponding to FIG. 4 and a longitudinal sectional view showing still another specific example of the surface light source device. FIG. 11 is a view corresponding to FIG. 4 and a longitudinal sectional view showing still another specific example of the surface light source device. FIG. 12 is a view corresponding to FIG. 4 and a longitudinal sectional view showing still another specific example of the surface light source device. FIG. 13 is a view corresponding to FIG. 2 and a longitudinal sectional view showing another specific example of the light emitting device. FIG. 14 is a view corresponding to FIG. 2 and a longitudinal sectional view showing still another specific example of the light emitting device. 15 is a view corresponding to FIG. 3 and a front view showing the light emitting device of FIG. 14. FIG. FIG. 16 is a view corresponding to FIG. 2 and a longitudinal sectional view showing still another specific example of the light emitting device. FIG. 17 is a view corresponding to FIG. 2 and a longitudinal sectional view showing still another specific example of the light emitting device. FIG. 18 is a view corresponding to FIG. 2 and a longitudinal sectional view showing still another specific example of the light emitting device. FIG. 19 is a view corresponding to FIG. 2 and a longitudinal sectional view showing still another specific example of the light emitting device. FIG. 20 is a view corresponding to FIG. 2 and a longitudinal sectional view showing still another specific example of the light emitting device. FIG. 21 is a view corresponding to FIG. 2 and a longitudinal sectional view showing still another specific example of the light emitting device. 22 is an exploded perspective view showing the surface light source device of FIG. 20. FIG. FIG. 23 is a view corresponding to FIG. 2 and a longitudinal sectional view showing still another specific example of the light emitting device. FIG. 24 is a view corresponding to FIG. 2 and a longitudinal sectional view showing still another specific example of the light emitting device. FIG. 25 is a graph showing the illuminance distribution along the first direction on the light-emitting surfaces of the surface light source devices according to samples 1-4. 26(a) to 26(d) are photographs of the decorative sheets of the light emitting devices according to Samples 1 to 4, respectively, while the light emitting devices are emitting light.

An embodiment of the present disclosure will be described below with reference to the drawings. In the drawings attached to this specification, for the convenience of illustration and ease of understanding, the scale and the ratio of vertical and horizontal dimensions are changed and exaggerated from those of the real thing.

In addition, terms such as "parallel", "perpendicular", "identical", etc. that specify shapes and geometric conditions and their degrees used in this specification are not bound by a strict meaning, It is interpreted to include the extent to which similar functions can be expected.

Furthermore, the terms "sheet", "film" and "plate" are not to be distinguished from each other as used herein solely based on a difference in designation. For example, "plate" is a concept that includes members that can be called sheets and films. Therefore, the term "light guide plate" is not distinguished from the term "light guide sheet" or "light guide film" only in terms of name.

Furthermore, the term “sheet surface (film surface, plate surface)” refers to the sheet-like (film-like, plate-like) object when the target sheet-like (film-like, plate-like) member is viewed as a whole and broadly. It refers to the surface that coincides with the plane of a plate-shaped member. In addition, the normal direction to the sheet-like (film-like, plate-like) member is the normal direction to the sheet surface (film surface, plate surface) of the sheet-like (film-like, plate-like) member. Point.

1 to 26 are diagrams for explaining a plurality of specific examples of one embodiment. 1 and 2 are a perspective view and a vertical cross-sectional view, respectively, showing an example of the lighting system 10. FIG. A lighting system 10 in the present embodiment is a device used for lighting and presentation of a space S partitioned at least partially by the structure 2 . The lighting system 10 includes a lighting fixture 15 that irradiates a space with illumination light, and a light emitting device 20 that is incorporated in the structure 2 . The light emitting device 20 has a decorative sheet 40 forming a decorative surface 2 a that is the surface of the structure 2 and a surface light source device 50 that illuminates the decorative sheet 40 . The decorative sheet 40 includes a light emitting area Z1 facing the light emitting surface 50a of the surface light source device 50 and a non-light emitting area Z2 adjacent to the light emitting area Z1. In this way, separately from the lighting equipment 15 mainly aimed at improving the brightness of the space S, the decorative surface 2a of the structure 2 is illuminated with transmission light by the light emitting device 20, thereby expanding the limited space S. can be given. In particular, the light-emitting region Z1 of the light-emitting device 20 can be limited, and the surface light source device 50, which is the light source of the light-emitting device 20, can be hidden by the decorative sheet 40. FIG. With this device, the space S can be produced in a state in which the presence of the light source is effectively reduced, thereby making it possible to effectively enhance the atmosphere of the space S.

Specifically, in the illustrated example, the structure 2 includes, as components of the building 1, a ceiling c, walls w and a floor f. The lighting fixture 15 is attached to the ceiling c. The light-emitting device 20 constitutes a wall w as the building material panel 3 . Further, the light emitting device 20 is optically devised to make the presence of the surface light source device 50 more effectively inconspicuous, which will be described later. As a result, the light emitting device 20 can produce a calm atmosphere while emphasizing the expansiveness of the space, and as a result, can bring added values such as luxury and comfort to the space S.

An embodiment will be described in detail below based on the illustrated specific examples.

As described above, lighting system 10 includes lighting fixture 15 and light emitting device 20 . As shown in FIGS. 1 and 2, the lighting fixture 15 is attached to the ceiling c and emits illumination light Lx into the space S from above. The lighting fixture 15 may be fixed to the ceiling c or may be suspended from the ceiling c. The luminaire 15 assists in grasping the inside of the space S through human vision. Therefore, as the lighting device 15, a general indoor lighting device can be used. The illumination light Lx emitted from the lighting device 15 is not particularly limited, but natural illumination can be achieved by using white.

Next, the light emitting device 20 will be described. The light emitting device 20 has the decorative sheet 40 and the surface light source device 50 as main components, as described above. In the illustrated specific example, the light emitting device 20 is formed in a plate shape as a whole, and part or all of it constitutes the building material panel 3 . As shown in FIG. 2, the building material panel 3 may be stacked on the wall body wa to form a wall w of the building 1 together with the wall body wa. In such an example, all or part of the constituent elements of the light-emitting device 20 may be handled as an assembly kit 4 for producing the building material panel 3 or the structure 2 and distributed or sold. Alternatively, the building material panel 3, which will be referred to later, may form the wall w of the building 1 alone.

In one specific example shown in FIG. 2, the light emitting device 20 has auxiliary building materials 21, fasteners 22 and boards 30 in addition to the decorative sheet 40 and the surface light source device 50. As shown in FIG. FIG. 3 is a front view showing the light emitting device 20 shown in FIG. 2. FIG. 4 is a longitudinal sectional view showing an example of the surface light source device 50. As shown in FIG. The light emitting device 20 will be described below mainly with reference to FIGS. 2 to 4. FIG.

First, the decorative sheet 40 will be described. The decorative sheet 40 is exposed in the space S. That is, the decorative sheet 40 forms the decorative surface 2 a of the structure 2 . The decorative sheet 40 forms the surface of the light-emitting device 20 on the most light-emitting side. As the decorative sheet 40, wallpaper of buildings, interior materials such as floors and ceilings, interior materials of moving bodies such as vehicles, and members forming the outermost surfaces of furniture, electrical equipment, and the like can be used.

As described above, the decorative sheet 40 includes the light-emitting region Z1 facing the light-emitting surface 50a of the surface light source device 50 and the non-light-emitting region Z2 offset from the position facing the light-emitting surface 50a. The non-light-emitting region Z2 is adjacent to the light-emitting region Z1. The decorative sheet 40 is irradiated with light from the rear side by the surface light source device 50 in the light emitting region Z1. The decorative sheet 40 has visible light transmittance at least in the light emitting region Z1. Therefore, at least part of the light emitted from the light emitting surface 50 a of the surface light source device 50 can pass through the light emitting region Z1 of the decorative sheet 40 . Since the decorative sheet 40 is illuminated with transmitted light in this manner, a white wallpaper having a relatively high transmittance is suitably used as the decorative sheet 40 . However, wallpaper with a relatively low transmittance, such as wood grain wallpaper, can be sufficiently effectively transilluminated to achieve the effects described later, and the pattern of the decorative sheet 40 is not particularly limited. The visible light transmittance in the visible light region in the light emitting region Z1 of the decorative sheet 40 is preferably 1.0% or more, and more preferably 10% or more. The visible light transmittance is measured using an infrared-visible-ultraviolet spectrophotometer (UV3100PC manufactured by Shimadzu Corporation), and the spectral transmittance in the wavelength range of 380 nm or more and 780 nm or less is measured according to JIS A5759-2008. It is calculated by a prescribed calculation formula.

As shown in FIG. 3, the light-emitting regions Z1 and the non-light-emitting regions Z2 are arranged in a uniaxial direction. The light-emitting region Z1 is located on one side in the uniaxial direction, and the non-light-emitting region Z2 is located on the other side in the uniaxial direction. Also, in the example shown in FIG. 3, the two light emitting devices 20 are arranged in a direction non-parallel to the uniaxial direction. More specifically, the light emitting area Z1 and the non-light emitting area Z2 are arranged in the first direction d1. This first direction d1 is along the vertical direction in the illustrated example. The light-emitting region Z1 is located on the first side s1 in the first direction d1, and the non-light-emitting region Z2 is located on the second side s2 in the first direction d1. The first side s1 in the first direction d1 is the upper side in the vertical direction, and the second side s2 in the first direction d1 is the lower side in the vertical direction. Also, two light emitting devices 20 are arranged in a second direction d2 orthogonal to the first direction d1.

From the viewpoint of expecting the effect of enhancing the atmosphere of the space by the light emitting device 20, it is preferable to make the boundary between the light emitting area Z1 and the non-light emitting area Z2 of the decorative sheet 40 inconspicuous. From this point, it is preferable that the decorative sheet 40 has the same configuration in the light-emitting region Z1 and the non-light-emitting region Z2.

Next, the board 30 will be explained. As shown in FIG. 2, the board 30 is a plate-like member. The board 30 is arranged so as to face at least the non-light-emitting region Z2 of the decorative sheet 40 . The decorative sheet 40 may be attached to the board 30 . In this case, the board 30 can stably support the decorative sheet 40 .

In the example shown in FIG. 2, the board 30 is arranged facing both the non-light-emitting area Z2 and the light-emitting area Z1. This board 30 is provided with a recess 31 at a position facing the light emitting area Z1. A surface light source device 50 is accommodated in the concave portion 31 of the board 30 . According to the example of FIG. 2 , the surface light source device 50 can be stably supported by the board 30 . The fastener 22 is provided on the board 30 and fixes the surface light source device 50 on the board 30 . Further, in addition to or instead of the fasteners 22, the board 30 and the surface light source device 50 may be fixed by a bonding layer containing an adhesive, a pressure-sensitive adhesive, or the like.

It is preferable that the light emitting surface 50a of the surface light source device 50 and the surface 30a of the board 30 facing the non-light emitting area Z2 of the decorative sheet 40 are located on the same plane. The decorative sheet 40 is laminated on the board 30 and the surface light source device 50 positioned in this manner. In this case, a step is less likely to be formed between the surface 30a of the board 30 and the light emitting surface 50a of the surface light source device 50, and the design of the decorative sheet 40 deteriorates due to the step being visible through the decorative sheet 40. can be effectively suppressed. Furthermore, the presence of the surface light source device 50 can be effectively made inconspicuous when the light emitting device 20 emits light, and the effect of enhancing the atmosphere of the space S by the light emitting device 20, which will be described later, is more pronounced.

The board 30 is determined according to the application of the decorative sheet 40 . When the decorative sheet 40 is a member that decorates the surfaces of walls, floors, ceilings, etc., the board 30 may be made of wood such as veneer, plywood, laminated wood, particle board, fiber board, etc. It can be an inorganic non-metallic plate made of a plate material, cement-based material such as concrete or mortar, a gypsum board, calcium silicate or the like, or a metal plate made of iron, aluminum or the like. When the decorative sheet 40 serves as an interior material for a moving object such as a vehicle, the board 30 is, for example, a resin plate or a metal plate. When the decorative sheet 40 constitutes furniture or electrical appliances, the board 30 is, for example, a wooden board or a resin board. In applying the light emitting device 20 to the building material panel 3, the board 30 preferably has flame resistance and fire resistance.

2 and FIGS. 13, 14, and 16 to 20 corresponding to FIG. 2, the decorative sheet 40 is placed between the board 30 and the surface light source device 50 with the illustration of the fastener 22. It is illustrated with a gap left. However, they may be attached to the board 30 and the surface light source device 50 without leaving a gap.

The auxiliary building material 21 is a member provided at the interface between the ceiling c and the wall w. The auxiliary building material 21 covers the joint between the ceiling c and the wall w, and improves the design of the structure 2. - 特許庁As the auxiliary building material 21, members called "surrounding edge" or "baseboard" can be used. However, as will be described later, it is also possible to omit the auxiliary building material 21 . In addition, in the example shown in FIG. 3 , a single auxiliary building material 21 is commonly used for the two light emitting devices 20 . The auxiliary building material 21 extends in the second direction d2. The auxiliary building material 21 may be fixed or may be detachable for replacement.

Next, the surface light source device 50 that illuminates the decorative sheet 40 from behind will be described in detail. The surface light source device 50 has a light emitting surface 50a that emits planar light. The surface light source device 50 is positioned such that its light emitting surface 50a faces only a portion of the decorative sheet 40. As shown in FIG. Various devices capable of emitting planar light can be used as the surface light source device 50 . For example, a device having a light source 51 and an optical member 55 that converts light emitted from the light source 51 into planar light can be used as the surface light source device 50 .

Here, a specific example of the surface light source device 50 will be described mainly with reference to FIGS. 3 and 4. FIG. The surface light source device 50 shown in FIG. 4 is configured as an edge light type surface light source device. This surface light source device 50 has a light source 51 , a light diffusion sheet 56 as an optical member 55 , a reflection sheet 57 and a light guide plate 60 .

The light source 51 has a light emitter 52 that emits light. The light emitter 52 is not particularly limited, and various members that emit light can be widely used. Specifically, for example, a cold cathode tube, a point-like light emitting diode (LED), an incandescent lamp, a laser oscillation device, or the like can be used as the light emitter 52 of the light source 51 . In the illustrated example, the light source 51 has a plurality of point-like light emitters 52 . This light emitter 52 is configured by, for example, a light emitting diode. In the example shown in FIGS. 2 and 3, the plurality of light emitters 52 are held by the auxiliary building material 21 . As shown in FIG. 3, the plurality of light emitters 52 are arranged at intervals along the second direction d2, which is the longitudinal direction of the auxiliary building material 21. As shown in FIG. If the auxiliary building material 21 is detachable, the plurality of light emitters 52 can be removed from the wall w together with the auxiliary building material 21, and part or all of the plurality of light emitters 52 can be replaced.

The light guide plate 60 is a plate-like member having a pair of main surfaces 60a and 60b and side surfaces positioned between the pair of main surfaces 60a and 60b. One main surface forms the light output surface 60a, and the other main surface forms the back surface 60b. The main surfaces 60a and 60b are typically rectangular in plan view. The main surfaces 60a and 60b have a pair of side edges extending along the first direction d1 and a pair of side edges extending along the second direction d2 orthogonal to the first direction d1. The side surfaces include a light incident surface 60c and an opposite surface 60d facing in the first direction d1.

As shown in FIGS. 2 and 3, the light incident surface 60c is positioned on the first side s1 in the first direction d1. The light entrance surface 60c extends along the auxiliary building material 21 in the second direction d2. The light incident surface 60 c faces the plurality of light emitters 52 held by the auxiliary building material 21 . The multiple light emitters 52 are arranged at intervals along the second direction d2, which is the longitudinal direction of the light incident surface 60c.

As shown in FIG. 4 , light emitted from the light source 51 enters the light guide plate 60 and travels through the light guide plate 60 . Light guide plate 60 includes an outcoupling element 61 . The extraction element 61 changes the direction of travel of the lights L41 and L42 traveling through the light guide plate 60 . In this surface light source device 50, the light emitted from the light source 51 is incident on the light guide plate 60 through the light incident surface 60c, and travels through the light guide plate 60 through reflection, especially total reflection. The lights L41 and L42 traveling through the light guide plate 60 are caused to change their traveling directions by the extraction element 61, especially by being scattered, so that they are incident on the pair of main surfaces 60a and 60b of the light guide plate 60 at an angle of incidence less than the critical angle for total reflection. It is possible for the light to enter and exit from the light guide plate 60 .

The light whose traveling direction has been changed by the extraction element 61 is emitted from the light guide plate 60 via one of the pair of main surfaces 60a and 60b. A light diffusion sheet 56 is provided facing the light exit surface 60 a of the light guide plate 60 . Lights L 41 and L 42 emitted from the light exit surface 60 a of the light guide plate 60 then enter the light diffusion sheet 56 . The light diffusing sheet 56 has a light diffusing function, and can adjust the luminance angular distribution caused by the transmitted light. The light diffusion sheet 56 forms the light emitting surface 50 a of the surface light source device 50 . The light diffused by the light diffusion sheet 56 is emitted from the surface light source device 50 toward the decorative sheet 40 . The light diffusion sheet 56 can employ various configurations capable of exhibiting a light diffusion function. The diffusion characteristics of the light diffusion sheet 56 may be isotropic or anisotropic.

A reflective sheet 57 is provided facing the rear surface 60 b of the light guide plate 60 . The reflective sheet 57 can reflect the light emitted from the back surface 60 b and direct it toward the light guide plate 60 and the light diffusion sheet 56 . By providing the reflection sheet 57, the amount of light emitted from the light emitting surface 50a of the surface light source device 50 can be increased. Thereby, the utilization efficiency of the light emitted from the light source 51 can be improved. The reflective sheet 57 may employ various configurations capable of exhibiting a light reflecting function. The reflection characteristic of the reflection sheet 57 may be specular reflection or diffuse reflection. The diffuse reflection characteristics of the reflective sheet 57 may be isotropic or anisotropic.

As extraction element 61, various elements that can change the traveling direction of light traveling through light guide plate 60 can be used. In the example shown in FIG. 4 , the light guide plate 60 has a plate-like light guide plate main body 65 . The light guide plate main body 65 has an uneven surface 65 a as a surface that forms one main surface of the light guide plate 60 . In the illustrated example, the back surface 60b of the light guide plate 60 is formed by this uneven surface 65a. The concave-convex surface 65a is formed by providing the light guide plate main body 65 with concave portions 65b. In this example, the light guide plate main body 65 can be made of a resin having visible light transmittance.

As another example, the outcoupling element 61 can be a light scattering layer 66 laminated to the light guide plate body 65, as shown in FIG. In the example shown in FIG. 5 , the light guide plate 60 has a light guide plate body 65 and a light scattering layer 66 . The light scattering layer 66 has a support layer 66a functioning as a binder and light scattering elements 66b dispersed within the support layer 66a. The support layer 66a can be made of a resin having visible light transparency. The light scattering element 66b has a function of changing the traveling direction of light traveling through the light scattering layer 66 by reflection, refraction, diffraction, or the like. The light scattering element 66b may have a refractive index different from that of the support layer 66a, or may be made of a material having light reflectivity such as metal. Specific examples of the light scattering element 66b include metallic compounds, gas-containing porous substances, resin beads surrounding metallic compounds, white fine particles, air bubbles, and particles having a different refractive index than the surroundings. In the example shown in FIG. 5, the lights L51 and L52 traveling through the light guide plate 60 due to reflection on the light exit surface 60a and the back surface 60b collide with the light scattering elements 66b in the light scattering layer 66 to change their traveling directions. After that, the light can be emitted from the light guide plate 60 .

In the example of FIG. 5, it is preferable that the refractive index of the support layer 66a of the light scattering layer 66 is equal to or higher than the refractive index of the light guide plate main body 65. As shown in FIG. When the refractive index of the support layer 66a of the light scattering layer 66 is lower than that of the light guide plate main body 65, the light L53 traveling through the light guide plate main body 65 is totally reflected at the interface between the light guide plate main body 65 and the light scattering layer 66. As a result, there is a possibility that the light cannot enter the light scattering layer 66 . After entering the light guide plate 60 from the light entrance surface 60c, the light L53 travels through the light guide plate main body 65 to the opposite surface 60d. The presence of such light reduces the energy efficiency of the light source 51 . By setting the refractive index of the support layer 66a to be equal to or higher than the refractive index of the light guide plate main body 65, total reflection at the interface between the light guide plate main body 65 and the light scattering layer 66 is effectively prevented, and the light scattering layer 66 is extracted. It can function more effectively as element 61.

As yet another example, as shown in FIG. 6, light scattering elements 67 functioning as outcoupling elements 61 may be dispersed within the light guide plate body 65 . In the light guide plate 60 shown in FIG. 6 , the light L61 traveling inside the light guide plate main body 65 collides with the light scattering elements 67 to be scattered and emitted from the light guide plate 60 . The light scattering element 67 can be configured in the same manner as the light scattering element 66b described above.

Also, the light guide plate 60 may include multiple types of extraction elements 61 . In the example shown in FIG. 6, a light guide plate main body 65 of the light guide plate 60 contains a light scattering element 67 and further has an uneven surface 65a forming a rear surface 60b of the light guide plate 60. As shown in FIG.

Furthermore, the light scattering power due to the extraction elements 61 in each region of the light guide plate 60 may not be constant and may be different. That is, the light scattering power of the light guide plate 60 may be changed in each region along the plate surface. Furthermore, in other words, the light scattering power in a certain region of the light guide plate 60 may be different from the light scattering power in other regions shifted from the region along the plate surface. By changing the light scattering power in each region along the panel surface of the light guide plate 60, it is possible to adjust the amount of light emitted from each region.

The light scattering power is the strength of the light guide plate 60's ability to scatter light passing through it. The degree of light scattering ability can be evaluated, for example, by using the haze value [%] measured according to JIS-K7361-1, and the higher the haze value [%], the higher the light scattering ability. It will be. Therefore, in the illustrated example, the transmission haze value of light transmitted in the normal direction to the plate surface of the light guide plate 60 is not constant in each area of the light guide plate 60, but has different values. The haze value [%] can be measured by a method based on JIS K7136 using a haze meter (manufactured by Murakami Color Research Laboratory, product number: HM-150).

As shown in FIG. 4, in the case where the extraction element 61 is unevenness provided on the main surfaces 60a and 60b of the light guide plate 60, the area of the unit area along the plate surface where the unevenness is provided is By increasing the ratio, that is, the area ratio, the light scattering power can be increased. Further, when the extracting element 61 is an uneven surface 65a formed by a concave portion 65b or a convex portion, the value of the ratio of the depth H1 of the concave portion 65b or the height of the convex portion to the thickness H2 of the light guide plate 60, That is, by increasing the value of H1/H2, the light scattering ability can be increased. When the extraction element 61 includes the light scattering elements 66b and 67 contained in the light guide plate 60, increasing the volume ratio of the light scattering elements 66b and 67 in the light guide plate 60, increasing the particle density, is increased and the refractive index difference at the interface formed by the light scattering elements 66b and 67 is increased, the light scattering power can be increased.

Further, when the light emitting device 20 includes the light guide plate 60, the pair of main surfaces of the light guide plate 60, that is, the light exit surface 60a and the back surface 60b of the light guide plate 60 are preferably hard-coated. For example, the light guide plate 60 has a light guide plate main body 65 and a hard coat layer laminated on the light guide plate main body 65 and having a hardness higher than that of the light guide plate main body 65. Either one or both may be formed. Further, in the example shown in FIG. 5, even if the support layer 66a of the light scattering layer 66 is made of a material having higher hardness than the light guide plate main body 65, and the light scattering layer 66 functions as a hard coat layer, good.

By the way, it is effective that the presence of the surface light source device 50 is inconspicuous in order to make the effect to be described later, that is, the effect that the light emitting device 20 gives to the atmosphere of the space S more prominently. In order to make the presence of the surface light source device 50 inconspicuous, the amount of light emitted from the light emitting surface 50a of the surface light source device 50 is changed along the first direction d1, which is the arrangement direction of the light emitting regions Z1 and the non-light emitting regions Z2. was confirmed to be effective.

More specifically, the amount of light emitted from a certain position on the light emitting surface 50a is greater than the amount of light emitted from another position on the light emitting surface 50a located on the first side s1 in the first direction d1 with respect to that position. preferably less. That is, it is preferable that the amount of light emitted from the light emitting surface 50a is reduced at a position close to the non-light emitting region Z2 located on the second side s2 in the first direction d1. More preferably, the amount of light emitted from an arbitrarily selected position on the light emitting surface 50a is equal to or less than the amount of light emitted from other positions on the light emitting surface 50a located on the first side s1 in the first direction d1 from the position. ing. That is, it is preferable that the amount of light emitted from the light emitting surface 50a decreases as it approaches the non-light emitting area Z2 located on the second side s2 in the first direction d1.

Such a preferable emitted light amount distribution in the first direction d1 can be obtained by, for example, controlling the distribution of the extraction elements 61 in the first direction d1 as described above, and controlling the degree of light scattering power caused by the extraction elements 61 in the first direction d1. can be achieved by adjusting along 4 to 6, the light incident surface 60c of the light guide plate 60 is positioned on the first side s1 in the first direction d1, and the opposite surface 60d is positioned on the first side s1. It is located on the second side s2 in one direction d1. As a general tendency regarding such an edge light type surface light source device 50, the amount of light emitted from the light emitting surface 60a of the light guide plate 60 is opposite from the light incident surface 60c side along the first direction d1, which is the light guiding direction. It gradually decreases toward the surface 60d. That is, in such a surface light source device 50, even if the light scattering power caused by the extraction element 61 is uniform along the first direction d1, the above-described preferred emitted light amount distribution in the first direction d1 is realized. be able to.

In FIGS. 1 and 3, and FIG. 15, which will be referred to later, the amount of light emitted from the light emitting device 20 is indicated by shading, and areas where the amount of emitted light increases are indicated by "dark".

In addition, if the illuminance X [lx] at the periphery of the light emitting surface 50a due to the light emitted from the surface light source device 50 is sufficiently reduced, the presence of the surface light source device 50 can be effectively made inconspicuous. was discovered. Specifically, when the illuminance X [lx] due to the light emitted from the light emitting surface 50a at any peripheral edge of the light emitting surface 50a satisfies the following formula (A), it overlaps with the peripheral edge. It is possible to effectively make the presence of the surface light source device 50 hidden by the decorative sheet 40 difficult to perceive.
1≦(X×T+300×R)/(300×R)<1.1 (A)
Here, “X” in the formula (A) is the illuminance [lx] at the peripheral edge of the light emitting surface 50a due to the light emitted from the surface light source device 50, and “T” is the peripheral edge facing the light emitting surface 50a. is the visible light transmittance [%] of the decorative sheet 40 at the position, and "R" is the visible light reflectance [%] of the decorative sheet 40 at the position facing the peripheral edge. The illuminance was measured by using an illuminance meter TR-74Ui manufactured by T&D Co., Ltd. with the illuminance sensor of this illuminometer in close contact with the periphery of the light emitting surface 50a. Visible light transmittance [%] and visible light reflectance [%] are measured using an infrared visible ultraviolet spectrophotometer (UV3100PC manufactured by Shimadzu Corporation) in the wavelength range of 380 nm to 780 nm according to JIS A5759-2008. It is calculated by measuring the spectral transmittance or spectral reflectance and using the calculation formula specified in the same standard.

As described above, the decorative sheet 40 includes the light emitting area Z1 facing the light emitting surface 50a of the surface light source device 50 and the non-light emitting area Z2 not facing the light emitting surface 50a. The brightness on the surface of the light emitting device 20 depends on the amount of light emitted from each region of the decorative sheet 40 forming the surface. As shown in FIG. 7, the brightness in the light-emitting region Z1 is determined by the light L71 transmitted through the decorative sheet 40 in the illumination light Ll emitted from the light-emitting surface 50a of the surface light source device 50, and the light L71 in the ambient light Le. It depends on the light L72 reflected by the sheet 40. On the other hand, the brightness in the non-light-emitting region Z2 depends only on the light L73 reflected by the decorative sheet 40 out of the ambient light Le. Then, in an environment where the light emitting device 20 described here is assumed to be suitable, that is, in an environment where the atmosphere in the indoor space can be effectively improved using the light emitting device 20, the decorative surface when the lamp is turned on The illuminance on 2a is typically 300 [lx] or more. Therefore, “(X×T+300×R)” in formula (A) is an index representing the brightness sensed at the periphery of light-emitting region Z1 of decorative sheet 40, and “300×R” in formula (A) is , serves as an index representing the brightness sensed in the non-light-emitting region Z2 of the decorative sheet 40. FIG. Then, when the formula (A) is satisfied, the ratio of the index representing the brightness of the peripheral portion of the light-emitting region Z1 to the index representing the brightness of the non-light-emitting region Z2 is 1 or more and less than 1.1. corresponds to

When formula (A) is satisfied at any peripheral edge of the light-emitting region Z1, at least the peripheral edge is bright enough to be distinguished from the non-light-emitting region Z2 with the naked eye. As a result, the existence of the surface light source device 50 hidden by the decorative sheet 40 at least in the peripheral portion is effectively inconspicuous.

Moreover, it is preferable that the formula (A) is satisfied at the periphery of the light-emitting region Z1 adjacent to the non-light-emitting region Z2. In the illustrated example, the formula (A) is preferably satisfied at the light emitting surface 50a located on the second side s2 in the first direction d1 and at the periphery of the light emitting region Z1. According to this example, as shown in FIGS. 1 and 3, the boundary between the light emitting area Z1 and the non-light emitting area Z2 can be effectively made inconspicuous. As a result, the existence of the surface light source device 50 can be more effectively made inconspicuous.

Considering that a person who is the subject of the judgment makes a judgment with the naked eye, the peripheral portion may be set within 3 cm from the edge of the light emitting surface 50a. By setting the peripheral portion in this way, it is possible to sufficiently effectively obtain the effect of making the presence of the surface light source device 50 inconspicuous.

In addition, in the above-described formula (A), it is assumed that changes in the visible light transmittance T [%] and the visible light reflectance R [%] are negligible within the decorative sheet 40 . However, in the case of strict evaluation, the following formula (B) may be used instead of the formula (A) described above.
1≦(X×T ₁ +300×R ₁ )/(300×R ₂ )<1.1 (B) Here, “X” in the formula (B) represents the light emitted from the surface light source device 50. "T ₁ " is the visible light transmittance of the decorative sheet 40 at the peripheral edge of the light emitting region Z1 facing the peripheral edge, and "R ₁ " is the illuminance at the peripheral edge of the light emitting surface 50a. , is the visible light reflectance [%] of the decorative sheet at the peripheral edge, and “R ₂ ” is the visible light reflection of the decorative sheet 40 at the peripheral edge of the non-light-emitting region Z2 adjacent to the peripheral edge of the light-emitting region Z1. rate [%]. Visible light transmittance [%] and visible light reflectance [%] are measured using an infrared visible ultraviolet spectrophotometer (UV3100PC manufactured by Shimadzu Corporation) in the wavelength range of 380 nm to 780 nm according to JIS A5759-2008. It is calculated by measuring the spectral transmittance or spectral reflectance and using the calculation formula specified in the same standard.

As described above, the formulas (A) and (B) employ the typical illuminance on the wall when the lamp is turned on. In a specific application of the light emitting device 20, the following equations (A') and (B'), which employ the actual illuminance in the applied space, are replaced by equations (A) and (B), respectively. It may be used instead.
1≦(X×T+Z×R)/(Z×R)<1.1 (A′)
1≦(X×T ₁ +Z ₁ ×R ₁ )/(Z ₂ ×R ₂ )<1.1 (B′) where “X”, “T” and “R ' is the same as 'X', 'T' and 'R' in formula (A) above. On the other hand, "Z" in the formula (A') is the illuminance [lx] due to ambient light on the decorative sheet 40, which is the periphery of the light emitting region Z1 facing the periphery of the light emitting surface 50a. Similarly, “X”, “T ₁ ”, “R ₁ ” and “R ₂ ” in formula (B′) are equivalent to “X”, “T ₁ ”, “R ₁ ” or Same as "R ₂ ". On the other hand, “Z ₁ ” in the formula (B′) is the illuminance [lx] due to the ambient light Le on the decorative sheet 40, which is the peripheral portion of the light emitting region Z1 facing the peripheral portion of the light emitting surface 50a, “Z ₂ ” in the formula (B′) is the illuminance [lx] due to ambient light Le on the decorative sheet 40 forming the periphery of the non-light-emitting region Z2 adjacent to the periphery of the light-emitting region Z1.

Here, experimental results of actually manufacturing samples 1 to 4 of the light emitting device 20 shown in FIG. 2 and confirming whether or not the boundary between the light emitting region Z1 and the non-light emitting region Z2 can be visually recognized for each sample will be described. .

Samples 1 to 4 had the same configuration as the light emitting device 20 shown in FIG. The surface light source device 50 was an edge light type, and as shown in FIG. Different light guide plates 60 were used for samples 1 to 4, but the other components were the same. For example, the light source 51, the light diffusion sheet 56, the reflection sheet 57, and the decorative sheet 40 of the surface light source device 50 were common among the samples 1-4.

In samples 1 and 3, the light guide plate 60 has a plate-like light guide plate main body 65 and a light scattering layer 66 laminated on the light guide plate main body 65 from the reflection sheet 57 side, as shown in FIG. made it In sample 3, the light scattering layer 66 was formed as a solid layer, and the light scattering layer 66 was provided on the entire main surface of the light guide plate main body 65 on the reflecting sheet 57 side. On the other hand, in sample 1, the occupied area ratio of the light scattering layer 66 is increased in the first direction d1 so that the light diffusing power gradually weakens from the first side s1 toward the second side s2 along the first direction d1. It was gradually lowered from the first side s1 toward the second side s2 along the line.

In samples 2 and 4, the light guide plate main body 65 of FIG. That is, in the samples 2 and 4, the back surface 60b of the light guide plate 60 was made the uneven surface 65a. The concave portions 65b are provided uniformly over the entire surface of the back surface 60b. In sample 2, recesses 65b having a greater depth and a larger planar shape than sample 4 were provided.

In samples 1 to 4, the light source of the surface light source device 50 had a plurality of light emitting diodes arranged at regular intervals along the light incident surface 60c of the light guide plate 60, as shown in FIGS. .

The decorative sheet 40 is white wallpaper. The visible light transmittance of the decorative sheet 40 was substantially constant over the entire surface and was 12.53%. The visible light reflectance of the decorative sheet 40 was substantially constant over the entire surface and was 77.10%.

The length of the light emitting region Z1 in each sample along the first direction d1 was set to 600 mm. FIG. 25 shows the results of illuminance measurement due to only the light source light on the light emitting surface 50a of the surface light source device 50 in each sample.

Also, in an environment where the illuminance is 495 [lx], samples 1 to 4 are placed, and the surface light source device 50 is illuminated, and whether the boundary between the light-emitting region Z1 and the non-light-emitting region Z2 is visible. Table 1 shows the results of confirming whether or not. In the column of "confirmation result" in Table 1, "x" is attached to the samples in which the position of the boundary between the light emitting region Z1 and the non-light emitting region Z2 was visually recognized, and the boundary between the light emitting region Z1 and the non-light emitting region Z2. "○" is attached to samples in which the position of was not visually recognized. Also, as shown in the "confirmation photograph" column of Table 1, photographs of the surfaces of the light emitting devices 20 according to samples 1 to 4 are shown in FIGS. 26(a) to 26(d), respectively. The boundary between the light-emitting region Z1 and the non-light-emitting region Z2 is located at the position of the triangular mark in FIGS. 26(a) to 26(d).

Furthermore, the visible light transmittance T of the decorative sheet 40 is set to 12.53 [%], the visible light reflectance R of the decorative sheet 40 is set to 77.10 [%], and the decorative sheet 40 facing the peripheral edge of the light emitting surface 50a Assuming that the illuminance Z caused by the ambient light at the upper position is 495 [lx], it was confirmed whether the formula (A') was satisfied. In the column of "value of ratio" in Table 1, the value of "(X*T+Z*R)/(Z*R)" in formula (A') is described. In addition, in the column of "conditional expression" in Table 1, "○" is attached to the samples that satisfy the formula (A'), and "X" is attached to the samples that do not satisfy the formula (A'). attached. The results shown in Table 1 demonstrate the effectiveness of formula (A').

Furthermore, only the decorative sheet 40 in Samples 1-4 was changed, and Samples 5-8 were actually produced, and the same experiments as Samples 1-4 were conducted. The decorative sheet 40 commonly used in Samples 5 to 8 was wood-like wallpaper. The visible light transmittance of this wood grain decorative sheet was substantially constant over the entire surface and was 1.73%. In addition, the visible light reflectance of the wood grain decorative sheet was substantially constant over the entire surface and was 11.89%.

Still another device can make the boundary between the light-emitting region Z1 and the non-light-emitting region Z2 inconspicuous.

As described above, in the edge light type surface light source device 50, the light emitted from the light source 51 enters the light guide plate 60 through the light entrance surface 60c. The light incident on the light guide plate 60 travels through the light guide plate 60 from the light incident surface 60c to the opposite surface 60d. Light traveling through the light guide plate 60 is emitted from the light guide plate 60 by colliding with the extraction elements 61 . However, some light reaches the opposite surface 60 d of the light guide plate 60 without colliding with the extraction element 61 . Such light is emitted from the light guide plate 60 via the opposite surface 60d. Due to the presence of such light, the region of the decorative sheet 40 facing the opposite surface 60d of the light guide plate 60 is observed brightly, and the presence of the surface light source device 50 may be easily perceived.

In order to prevent such a problem from occurring, in the examples shown in FIGS. 8 and 9, the light guide plate 60 has a visible light absorbing property in the end region which is the second side s2 in the first direction d1. and an absorbent portion 68 . The absorbing portion 68 can be a layer containing, for example, a visible light absorbing pigment such as carbon black or titanium black. In the example shown in FIG. 8, the absorbing portion 68 covers the end surface of the light guide plate main body 65 on the second side s2. In the example shown in FIG. 9, the pair of main surfaces of the light guide plate main body 65 are inclined with respect to the plate surface of the light guide plate main body 65 so as to approach each other in the end region of the second side s2. An absorbing portion 68 is provided on this inclined surface. The absorption portion 68 absorbs the lights L81 and L91 that have traveled through the light guide plate main body 65 to the end region on the second side s2, thereby preventing light leakage from the opposite surface 60d.

Further, in the example shown in FIG. 10, the light guide plate 60 includes a reflecting portion 69 having visible light reflectivity in the end region on the second side s2 in the first direction d1. The reflecting portion 69 can be formed using a highly reflective material such as silver or aluminum. In the example shown in FIG. 10, the reflecting portion 69 covers the end surface of the light guide plate main body 65 on the second side s2. The reflecting portion 69 reflects the light L101 that has traveled through the light guide plate main body 65 to the end region on the second side s2, thereby turning back the traveling direction of the light L101 along the first direction d1. This light L101 then becomes light that can be effectively used by colliding with the extraction element 61 . That is, by providing the reflecting portion 69, leakage of light from the opposite surface 60d can be effectively prevented, and the utilization efficiency of the light emitted from the light source 51 can be effectively improved.

Furthermore, the example shown in FIG. 11 can also effectively prevent leakage of light from the opposite surface 60d. In the example shown in FIG. 11, the pair of main surfaces 60a and 60b of the light guide plate 60 are inclined with respect to the first direction d1, which is the light guide direction. The pair of main surfaces 60a and 60b gradually approach in the first direction d1 from the first side s1 toward the second side s2. In this light guide plate 60, there is substantially no opposite surface 60d facing the light incident surface 60c along the first direction d1.

Light L111 traveling from the first side s1 to the second side s2 in the light guide plate 60 shown in FIG. , 60b. That is, the frequency at which light traveling from the first side s1 to the second side s2 in the first direction d1 is incident on the main surfaces 60a and 60b within a certain distance along the first direction d1 is get higher In the light guide plate 60 shown in FIG. 11, the angle of incidence of the light traveling through the light guide plate 60 on the main surfaces 60a and 60b becomes smaller each time the light is reflected by the main surfaces 60a and 60b. That is, in the example shown in FIG. 11, the main surfaces 60a and 60b inclined with respect to the first direction d1 function as the extracting element 61, and light is more likely to be incident on the main surfaces 60a and 60b on the second side s2. In addition, the light guide plate 60 does not have an opposite surface 60d that substantially faces the light incident surface 60c along the first direction d1. As described above, the light guide plate 60 shown in FIG. 11 can also effectively prevent light from leaking out from the end region of the second side s2 opposite to the light entrance surface 60c. At the same time, the utilization efficiency of the light emitted from the light source 51 can be effectively improved.

Next, the operation of the lighting system 10 having the configuration as described above will be described.

The illustrated lighting system 10 comprises a lighting fixture 15 and a light emitting device 20 . The luminaire 15 provides brightness to the space S to which the lighting system 10 is applied as normal lighting. On the other hand, the light emitting device 20 constitutes a part of the structure 2 that partitions the space S to which the lighting system 10 is applied. The decorative sheet 40 of the light emitting device 20 forms the decorative surface 2a of the structure 2 exposed to the space S. By appropriately selecting the decorative sheet 40 used for the light-emitting device 20, the light-emitting device 20 can be blended into the structure 2 without discomfort in the extinction state in which the surface light source device 50 does not emit light. For example, in the example shown in FIG. 1, only one wall w located in the middle of the three walls w shown has the light emitting device 20 incorporated therein, but the light emitting device 20 is extinguished. In practice, the three walls can be taken to be identical. That is, the application of the lighting system 10 does not impair the original design of the space S or the structure 2 .

1 and 3 show the light emitting state of the light emitting device 20 in which light is emitted from the light emitting region Z1. The light emitting device 20 has a surface light source device 50 on the back surface of the decorative sheet 40 exposed to the space S. The light-emitting surface 50a of the surface light source device 50 faces only a portion of the decorative sheet 40, that is, faces only the light-emitting region Z1. A sense of depth is imparted to the space S by the light emitting region Z1 of the decorative sheet 40 emitting light. That is, the spread can be emphasized in the finite space S. Such an effect is that the light-emitting region Z1 is arranged in a region including the edge of the decorative sheet 40, so that the light-emitting region Z1 and the non-light-emitting region Z2 are uniaxially arranged, for example, as in the illustrated example. By arranging in d1, it becomes more effective. However, it is not limited to such an example, and for example, from the viewpoint of emphasizing improvement in design, the light-emitting regions Z1 may be arranged in a dispersed manner on the decorative sheet 40 .

As for a lamp for illuminating a structure, for example, Japanese Patent Laid-Open No. 2011-210594 already mentioned has proposed a lamp for realizing illumination called a “wall washer”. However, conventional lamps are housed in a housing that protrudes into the space or in a recess formed in the ceiling. For this reason, there is a problem that a large installation space is required and installation is troublesome. In addition, in the conventional technology, since the position of the light source can be intuitively grasped and the light source can be seen directly, it is perceived as artificial lighting, and the production for emphasizing the spaciousness does not function as expected. rice field.

In contrast, in this embodiment, the surface light source device 50 is hidden by the decorative sheet 40 . Therefore, the surface light source device 50 is not visually recognized. Moreover, since the thickness of the surface light source device 50 can be set to several centimeters, a large installation space is not required. Furthermore, there is no need to prepare and secure an installation space such as a special housing or a special concave portion.

Furthermore, unlike the illumination by projection of light from the light source in the prior art, this embodiment employs transmitted illumination of the decorative sheet 40 using the surface light source device 50 . In the prior art, the setting of the illuminated area on the structure was restricted according to the light projection direction, but in the present embodiment, the light emitting area Z1 on the decorative sheet 40 can be set with a high degree of freedom. can be done.

In addition, by adopting the transmitted illumination of the decorative sheet 40 using the surface light source device 50, the degree of freedom in setting the brightness within the light emitting region Z1 is greatly improved. As a result, the emitted light intensity distribution along the first direction d1 in the light emitting region Z1 described above, that is, the emitted light intensity is reduced at a position close to the non-light emitting region Z2 located on the second side s2 in the first direction d1. Furthermore, it is possible to reduce the amount of light emitted from the light emitting surface 50a as it approaches the non-light emitting region Z2 located on the second side s2 in the first direction d1. According to this embodiment, the existence of the surface light source device 50 can be more effectively made inconspicuous. As a result, the light emitting device 20 can create a calm atmosphere while emphasizing the expansiveness of the space, and can give the space S an atmosphere such as a sense of luxury.

Further, by satisfying the formula (A), the formula (B), the formula (A'), or the formula (B'), it is possible to make it difficult to distinguish between the light-emitting region Z1 and the non-light-emitting region Z2. Therefore, when formula (A), formula (B), formula (A'), or formula (B') is satisfied, the existence of the surface light source device 50 can be more effectively made inconspicuous. As a result, the light emitting device 20 can create a calm atmosphere while emphasizing the expansiveness of the space, and can give the space S an atmosphere such as a sense of luxury.

Furthermore, by appropriately selecting the light emitter 52 of the light source 51 used in the surface light source device 50, it is also possible to make the light emission color of the light emitting device 20 have a tinge. When the light source 51 includes a plurality of types of light emitters 52 that emit light in different wavelength ranges, it is also possible to change the emission color depending on which light emitter 52 is lit. For example, the light emission color of the light emitting device 20 may be changed according to the temperature of the space S or the season. Further, the color of light emitted from the light emitting device 20 may be changed according to the purpose of use of the space S, for example, the contents of the discussion in the space S. Furthermore, instead of or in addition to controlling the emission color, the amount of emission may be controlled. The amount of light emission can be controlled by adjusting the type and quantity of light emitters 52 used for light emission. According to such a light-emitting device 20, it is possible to appeal to the sensibilities of the people in the space S and to impart comfort and the like beyond the effect of enhancing the atmosphere of the space S itself.

In the embodiment described above, the light emitting device 20 includes a surface light source device 50 having a light emitting surface 50a, a light emitting region Z1 facing the light emitting surface 50a, and a non-light emitting region Z2 adjacent to the light emitting region Z1. A decorative sheet 40 is provided. In this light emitting device 20, the light emitted from the light emitting surface 50a of the surface light source device 50 can pass through the decorative sheet 40 and proceed to the space S in which the light emitting device 20 is installed. With such a light-emitting device 20, it is possible to make it difficult to perceive that the decorative sheet 40 is artificially illuminated. In addition, only the light emitting area Z1 of the decorative sheet 40 emits light in a plane. According to such a light emitting device 20, the sense of presence of the surface light source device 50 can be effectively reduced, and thereby the atmosphere of the space S can be effectively produced. Specifically, it is possible to effectively emphasize the expansiveness of the space while producing a calm atmosphere. As a result, according to the light emitting device 20, the space S can be given a sense of luxury and comfort, and the space S can be added with added value.

As a result of extensive studies by the inventors of the present invention, it has been confirmed that it is effective to limit the ratio of the area occupied by the light emitting region Z1 of the light emitting device 20 in order to make the effect of the light emitting device 20 more effective. was done. In this case, the light emitting device 20 loses its presence and blends into the surrounding environment, making it possible to produce a dramatic effect without causing discomfort. In particular, when the ratio of the area occupied by the light emitting region Z1 is below a certain level in combination with the above formula (A), formula (B), formula (A'), or formula (B'), the rendering effect of the light emitting device 20 became more pronounced.

Specifically, the area occupied by the light emitting region Z1 of the light emitting device 20 is preferably 15% or less, more preferably 10% or less, and even more preferably 8% or less of the other region. I found out. Here, the other area is the area of the entire wall when the light emitting device 20 is installed on the wall w, for example. That is, when the light emitting device 20 is installed on the wall w, the area of the light emitting region Z1 with respect to the total area of the wall w is preferably 15% or less, more preferably 10% or less, and 8%. More preferably: Furthermore, when considering only the light emitting device 20, the area of the light emitting region Z1 with respect to the total area of the decorative sheet 40 is preferably 15% or less, more preferably 10% or less, of the other regions. It is more preferably 8% or less.

Further, in the specific example described above, the amount of light emitted from the light emitting surface 50a is changed along the uniaxial direction d1. The light-emitting region Z1 and the non-light-emitting region Z2 are aligned in the uniaxial direction d1. According to this light-emitting device 20, the brightness in the light-emitting region Z1 can be made different between the region adjacent to the non-light-emitting region Z2 and the region away from the non-light-emitting region Z2. As a result, the presence of the surface light source device 50 can be more effectively diluted.

Furthermore, in the above-described specific example, the amount of light emitted from a certain position on the light emitting surface 50a is the amount of light emitted from another certain position on the light emitting surface 50a located on one side s1 in the one-axis direction d1 from the position. less than The non-light-emitting region Z2 is adjacent to the light-emitting region Z1 from the other side s2 opposite to the one side s1 in the uniaxial direction d1. According to this light-emitting device 20, the brightness in the light-emitting region Z1 can be made darker in the region adjacent to the non-light-emitting region Z2 than in the region away from the non-light-emitting region Z2. As a result, the presence of the surface light source device 50 can be more effectively diluted.

Furthermore, in the above-described specific example, the amount of light emitted from an arbitrarily selected position on the light emitting surface 50a is equal to the amount of light emitted from another position on the light emitting surface 50a located on one side s1 in the one-axis direction d1 relative to the position. It is below the amount of light. According to this light-emitting device 20, the brightness in the light-emitting region Z1 can be gradually made darker as it approaches the non-light-emitting region Z2. As a result, the boundary between the light-emitting region Z1 and the non-light-emitting region Z2 can be effectively made inconspicuous, and the presence of the surface light source device 50 can be more effectively reduced. In addition, the spread of space can be emphasized more effectively.

Further, in the specific example described above, the surface light source device 50 includes a light guide plate 60 including an extraction element 61 that changes the traveling direction of light traveling inside the light guide plate 60, and one light guide plate 60 along the sheet surface of the decorative sheet 40 in the uniaxial direction d1. and a light source 51 facing the light guide plate 60 from the side s1. The non-light-emitting region Z1 is adjacent to the light-emitting region Z2 from the other side s2 opposite to the one side s1 in the uniaxial direction d1. According to this light-emitting device 20, the brightness in the light-emitting region Z1 can be gradually darkened as it approaches the non-light-emitting region Z1. As a result, the boundary between the light-emitting region Z1 and the non-light-emitting region Z2 can be effectively made inconspicuous, and the presence of the surface light source device 50 can be more effectively reduced. In addition, the spread of space can be emphasized more effectively.

Furthermore, in the above-described specific example, the light guide plate 60 has a reflecting portion 69 having a visible light reflecting function or an absorbing portion 68 having a visible light absorbing property in the end region which is the other side s2 in the one-axis direction d1. contains. According to such a light guide plate 60, it is possible to effectively prevent light leakage from the opposite surface 60d of the light guide plate 60 facing the light incident surface 60c. Therefore, it is possible to effectively prevent the end portion of the light-emitting region Z1 connected to the non-light-emitting region Z2 from becoming locally bright. Thereby, the presence of the surface light source device 50 can be more effectively diluted. Moreover, when the reflecting portion 69 is used, the utilization efficiency of the light emitted from the light source 51 can be effectively improved.

Furthermore, in the above-described specific example, the illuminance X [lx] caused by the light emitted from the light emitting surface 50a at any peripheral portion of the light emitting surface 50a and the makeup at the position facing the peripheral portion of the light emitting surface 50a It is preferable that the visible light transmittance T [%] and the visible light reflectance R [%] of the sheet 40 satisfy the following formula (A).
1≦(X×T+300×R)/(300×R)<1.1 (A)
More precisely, the illuminance X [lx] due to the light emitted from the light emitting surface 50a at any peripheral edge of the light emitting surface 50a and the illuminance X [lx] at the peripheral edge of the light emitting region Z1 facing the peripheral edge of the light emitting surface 50a The visible light transmittance T ₁ [%] of the decorative sheet, the visible light reflectance R ₁ [%] of the decorative sheet 40 at the periphery of the light-emitting region Z1, and the non-light-emitting region Z2 adjacent to the periphery of the light-emitting region Z1 It is preferable that the visible light reflectance R ₂ [%] of the decorative sheet 40 at the peripheral edge of the area satisfies the following formula (B).
1≦(X×T ₁ +300×R ₁ )/(300×R ₂ )<1.1
... (B)
According to this light-emitting device 20, the boundary between the light-emitting region Z1 and the non-light-emitting region Z2 can be effectively made inconspicuous, and the presence of the surface light source device 50 can be more effectively reduced. In addition, the spread of space can be emphasized more effectively.

Furthermore, in the specific example described above, the light-emitting device 20 further includes a board 30 arranged to face at least the non-light-emitting region Z2. By using the board 30, the constituent elements of the surface light source device 50 and the decorative sheet 40 can be stably supported. As a result, the boundary between the light-emitting region Z1 and the non-light-emitting region Z2 can be effectively made inconspicuous, and the presence of the surface light source device 50 can be more effectively reduced.

Furthermore, in the specific example described above, the light emitting surface 50a of the surface light source device 50 and the surface 30a of the board 30 facing the non-light emitting area Z2 are positioned on the same virtual plane. Therefore, the boundary between the light emitting area Z1 and the non-light emitting area Z2 can be effectively made inconspicuous, and the presence of the surface light source device 50 can be more effectively reduced.

Furthermore, in the one specific example described above, the board 30 is arranged facing both the non-light emitting area Z2 and the light emitting area Z1. The board 30 is provided with a concave portion 31 that accommodates the surface light source device 50 at a position facing the light emitting region Z1. By using the board 30, the constituent elements of the surface light source device 50 and the decorative sheet 40 can be stably supported. As a result, the boundary between the light-emitting region Z1 and the non-light-emitting region Z2 can be effectively made inconspicuous, and the presence of the surface light source device 50 can be more effectively reduced.

Various modifications can be made to the specific examples described above. An example of modification will be described below 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 portions in the above-described specific example are used for the portions that can be configured in the same manner as the above-described specific example, and the same reference numerals are used. Description is omitted.

In the above-described specific example, the surface light source device 50 is an edge light type having the light guide plate 60 and the light source 51 arranged on the side of the light guide plate 60, but it is not limited to this. For example, the direct type surface light source device 50 may be incorporated into the light emitting device 20 . A surface light source device 50 shown in FIG. 12 has a light diffusion sheet 56 , a reflection sheet 57 and an optical sheet 58 as optical members 55 . The optical sheet 58 is arranged between the light diffusion sheet 56 and the reflection sheet 57 . The light source 51 is arranged between the reflective sheet 57 and the optical sheet 58 . The light source 51 includes a plurality of light emitters 52 arranged in both the first direction d1 and the second direction d2. The optical sheet 58 has, for example, a function of adjusting the illuminance distribution resulting from the arrangement of the plurality of light emitters 52, for example, a function of equalizing. In the example shown in FIG. 12, the optical sheet 58 is composed of a prism sheet having prisms protruding toward the light diffusion sheet 56 side. In the surface light source device 50 of FIG. 12, the light diffusion sheet 56 forms the light emitting surface 50a, and can emit planar light that illuminates the light emitting region Z1 of the decorative sheet 40 in a planar manner.

With the surface light source device 50 shown in FIG. 12 as well, it is possible to achieve the above-described emission light quantity distribution along the first direction d1 within the light emitting region Z1. For example, the emitted luminous flux ([lm]) of a certain light emitter 52 is combined with the light emission of another certain light emitter 52 located on the first side s1 in the first direction d1 relative to the one light emitter 52. By making it lower than the luminous flux ([lm]), the amount of emitted light can be reduced at a position close to the non-light-emitting region Z2 located on the second side s2 in the first direction d1. According to this light-emitting device 20, the brightness in the light-emitting region Z1 can be made darker in the region adjacent to the non-light-emitting region Z2 than in the region away from the non-light-emitting region Z2. As a result, the presence of the surface light source device 50 can be effectively reduced.

Furthermore, the emitted luminous flux ([lm]) of one arbitrarily selected light emitter 52 is emitted from another light emitter 52 located on the first side s1 in the first direction d1 relative to the one light emitter 52. By making the light flux ([lm]) or less, it becomes possible to reduce the amount of light emitted from the light emitting surface 50a as it approaches the non-light emitting region Z2 located on the second side s2 in the first direction d1. . According to this light-emitting device 20, the brightness in the light-emitting region Z1 can be gradually made darker as it approaches the non-light-emitting region Z2. As a result, the boundary between the light-emitting region Z1 and the non-light-emitting region Z2 can be effectively made inconspicuous, and the presence of the surface light source device 50 can be more effectively reduced.

Furthermore, as the surface light source device 50, it is also possible to use a light emitting sheet such as an EL (Electro Luminescence) sheet, a surface light emitter, or a sheet light source.

As another modification, the transmittance of the decorative sheet 40 may be changed along the first direction d1.

In the specific example described above, an example in which the amount of light emitted from the light emitting surface 50a of the surface light source device 50 changes along the first direction d1 in order to make the presence of the surface light source device 50 inconspicuous has been described. However, the present invention is not limited to this example, and the surface light source device 50 can be made inconspicuous by changing the amount of light emitted from the light emitting region Z1 of the decorative sheet 40 along the first direction d1. Therefore, at least one of the amount of light emitted from the light emitting surface 50a and the transmittance of the decorative sheet 40 should be changed along the first direction d1.

For example, the visible light transmittance of the decorative sheet 40 at a certain position is lower than the visible light transmittance of the decorative sheet 40 at another position located on the first side s1 in the first direction d1 from the position. By lowering the height, the amount of light emitted from the decorative sheet 40 can be reduced at a position close to the non-light-emitting region Z2 located on the second side s2 in the first direction d1. According to this light-emitting device 20, the brightness in the light-emitting region Z1 can be made darker in the region adjacent to the non-light-emitting region Z2 than in the region away from the non-light-emitting region Z2. As a result, the presence of the surface light source device 50 can be effectively reduced.

Furthermore, the visible light transmittance of the decorative sheet 40 at an arbitrarily selected position is less than or equal to the visible light transmittance of the decorative sheet 40 at other positions located on the first side s1 in the first direction d1 from the position. This makes it possible to reduce the amount of light emitted from the decorative sheet 40 as it approaches the non-light emitting area Z2 located on the second side s2 in the first direction d1. According to this light-emitting device 20, the brightness in the light-emitting region Z1 can be gradually made darker as it approaches the non-light-emitting region Z2. As a result, the boundary between the light-emitting region Z1 and the non-light-emitting region Z2 can be effectively made inconspicuous, and the presence of the surface light source device 50 can be more effectively reduced.

As another modified example, the overall configuration of the light emitting device 20 can be changed as appropriate. The modified example described below can also achieve the same effect as the specific example described above.

First, as shown in FIG. 13, the auxiliary building material 21 in the specific example described above can be omitted. In the example shown in FIG. 13, the board 30 extends further to the first side s1 than the recess 31 that accommodates the surface light source device 50 in the first direction d1. The luminous body 52 of the light source 51 is held by a portion of the board 30 located closer to the first side s1 in the first direction d1 than the surface light source device 50 is. According to the example shown in FIG. 13, the light emitting device 20 including at least the decorative sheet 40, the board 30 and the light source 51, the building material panel 3 or the assembly kit 4 can be easily handled and attached to the structure 2.

Also, a portion for housing the light emitting device 20 may be provided in the structure 2 . In the examples shown in FIGS. 14 and 15, the light emitting device 20 is identical to the light emitting device shown in FIG. However, in the example shown in FIGS. 14 and 15, a recess ca is formed in the ceiling c to accommodate the end region of the light emitting device 20 located on the first side s1. By providing the recess ca, the light emitting device 20 can be stably held. Further, as shown in FIGS. 14 and 15, the light source 51 of the surface light source device 50 is positioned within the recess ca. As a result, the light emitting area Z1 of the decorative sheet 40 is connected to the ceiling c. According to such a light emitting device 20, the atmosphere of the space S can be produced more effectively. Furthermore, in the illustrated example, the end portion of the light guide plate 60 on the first side s1 in the first direction d1 is located on the first side s1 in the first direction d1 with respect to the surface of the ceiling c. The wall w can be brightly illuminated from the end of the first side s1 at d1, and the presentation effect can be further enhanced.

Furthermore, as shown in FIG. 16, the board 30 need not support the surface light source device 50 from the rear side. In the example shown in FIG. 16, the board 30 faces only the non-light-emitting area Z2 of the decorative sheet 40 and does not face the light-emitting area Z1. A support 33 is arranged between the wall body wa of the structure 2 and the surface light source device 50 . The surface light source device 50 may be fixed to the wall main body wa by this support 33 . A support frame, a support bolt, or the like can be used as the support 33 . In the example shown in FIG. 16 , the support 33 may also be included in the building panel 3 or assembly kit 4 .

Furthermore, as shown in FIG. 17, the light emitting device 20 may not include the board 30. FIG. In the example shown in FIG. 17, the surface light source device 50 including the light source 51 is fixed to the wall main body wa by the support 33 . The decorative sheet 40 may be held by the structure 2 at its periphery.

Furthermore, in the specific example described above, the light emitting device 20 is fixed to the wall body wa as the building material panel 3, but the present invention is not limited to this example. As shown in FIG. 18, the wall w of the building 1 may be formed only by the building material panel 3 formed by the light-emitting device 20 . In the example shown in FIG. 18, the light emitting device 20 includes a board 30, a surface light source device 50 supported by the board 30, and a pair of decorative sheets 40 laminated on both main surfaces of the board 30. there is A first decorative sheet 40</b>A of the pair of decorative sheets 40 is partly illuminated by the surface light source device 50 . On the other hand, the second decorative sheet 40</b>B of the pair of decorative sheets 40 is not illuminated by the surface light source device 50 . The second decorative sheet 40B can be attached to the board 30 over its entire area, like normal wallpaper.

However, as in the example shown in FIG. 19, the second decorative sheet 40B may also be illuminated by the surface light source device 50 in the same manner as the first decorative sheet 40. FIG. In this example, the light emitting device 20 may separately include the surface light source device 50 for the first decorative sheet 40A and the surface light source device 50 for the second decorative sheet 40B, or may include a single surface light source device 50 for the second decorative sheet 40B. The surface light source device 50 may emit light from both sides to illuminate both the first decorative sheet 40A and the second decorative sheet 40B. A double-sided light emitting surface light source device 50 is obtained, for example, by providing a light diffusion sheet 56 in place of the reflection sheet 57 of the surface light source device 50 shown in FIG.

Furthermore, in the specific example described above, the light guide plate 60 faces only the light-emitting region Z1 and does not face the non-light-emitting region Z2. However, the present invention is not limited to this example, and the light guide plate 60 may face both the light emitting area Z1 and the non-light emitting area Z2 of the decorative sheet 40 as shown in FIG. As described above, light traveling within the light guide plate 60 is allowed to exit the light guide plate 60 by the outcoupling elements 61 . Therefore, no light is emitted from the region of the light guide plate 60 where the extraction element 61 is not provided. That is, by providing the extraction element 61 only in the region of the light guide plate 60 facing the light emitting region Z1, the light emitting surface 60a of the surface of the light guide plate 60 facing the decorative sheet 40 facing the light emitting region Z1 is the light output surface 60a. , and the area facing the non-light emitting area Z2 does not function as the light emitting surface 60a from which light is emitted. Therefore, in FIG. 20 as well, the same effect as the specific example described above can be obtained.

As another modified example, as shown in FIG. 21, the decorative sheet 40 may be arranged to face two or more surfaces of the surface light source device 50 . In the example shown in FIG. 21, the surface light source device 50 has a pair of main surfaces 50b and a side surface 50c located between the pair of main surfaces 50b. One principal surface 50b includes the light emitting surface 50a. In the illustrated example, the decorative sheet 40 faces one main surface 50a including the light emitting surface 50a and a side surface 50c adjacent to this main surface 50b. More precisely, the decorative sheet 40 shown in FIG. 21 covers one main surface 50b including the light emitting surface 50a and four side surfaces 50c adjacent to this main surface 50b. In the example shown in FIG. 21 , the light emitting device 20 including the decorative sheet 40 and the surface light source device 50 is treated as one member and attached to the structure 2 . A panel member 70 including the board 30 and a decorative sheet 40 covering one main surface and side surface of the board 30 is attached to the structure 2 together with the light emitting device 20 . The light emitting device 20 shown in FIG. 21 can be installed in areas of various sizes and shapes by combining with the panel material 70 whose shape and size are adjusted.

22 shows an exploded perspective view of the light emitting device 20 of FIG. In the example shown in FIG. 22, the light emitting device 20 has a flat rectangular parallelepiped shape. The light emitting device 20 has a region 40a corresponding to one main surface 50b of the surface light source device 50 and four regions 40b corresponding to the four side surfaces 50c of the surface light source device 50, respectively. A portion of the region 40a of the decorative sheet 40 that faces the light emitting surface 50a forms a light emitting region Z1. 40b form a non-light-emitting region Z2.

The surface light source device 50 has a reflection sheet 57 , a light guide plate 60 , an adjustment sheet 59 and a light diffusion sheet 56 . A light emitter 52 is provided facing the light guide plate 60 from the first side s1 in the first direction d1. The adjustment sheet 59 includes a transparent base material 59a having visible light transmittance, and a light absorbing portion 59b provided on the base material 59a. The light absorbing portion 59b contains, for example, a visible light absorbing pigment, and has a visible light absorbing function. As an example, the light absorbing portion 59b contains carbon black or titanium black.

The adjustment sheet 59 is a layer for reducing the amount of light emitted from the decorative sheet 40 at a position close to the non-light-emitting region Z2 located on the second side s2 in the first direction d1. Further, the light absorbing power in each region of the adjustment sheet 59 is not uniform and varies. For example, the light absorption capacity of a certain region of the adjustment sheet 59 is compared with that of another region of the adjustment sheet 59 located on the first side s1 in the first direction d1 and closer to the light emitter 52 than that region. By making it stronger than the light absorption ability, it is possible to reduce the amount of light emitted from the region located on the second side s2 in the first direction d1 and adjacent to the non-light-emitting region Z2. Furthermore, the light absorption capacity of the adjustment sheet 59 in the arbitrarily selected region is made equal to or higher than the light absorption capacity of the adjustment sheet 59 in other regions located on the first side s1 in the first direction d1 from the region. This makes it possible to reduce the amount of emitted light as it approaches the non-light-emitting region Z2 located on the second side s2 in the first direction d1. These adjustment sheets 59 can make the brightness in the light-emitting region Z1 darker in the region adjacent to the non-light-emitting region Z2 than in the region away from the non-light-emitting region Z2. As a result, the presence of the surface light source device 50 can be effectively reduced.

The visible light absorbing ability can be adjusted by the content density of the pigment, the arrangement density of the light absorbing portions 59b, the thickness of the light absorbing portions 59b, and the like.

As a modification related to FIGS. 21 and 22, the light emitting device 20 in the modification shown in FIGS. It has a frame 34 . The support frame 34 reinforces the surface light source device 50 and facilitates installation of the surface light source device 50 on the outside such as the wall w. The decorative sheet 40 may be directly joined to the surface light source device 50 or may be joined to the support frame 34 so as to face the surface light source device 50 . In the example shown in FIG. 23, the decorative sheet 40 faces the area not covered by the support frame 34 of the surface light source device 50 in its light emitting area Z1. Further, the decorative sheet 40 faces the support frame 34 covering the surface light source device 50 in the non-light emitting area Z2. In the example shown in FIG. 24, the non-light emitting area Z2 of the decorative sheet 40 extends to the area facing the side surface of the surface light source device 50 via the support frame 34. In the example shown in FIG. Furthermore, in the example shown in FIGS. 23 and 24 , the light emitting device 20 has a support plate 35 supported by the support frame 34 together with the surface light source device 50 . The support plate 35 is a member for imparting rigidity to the light emitting device 20, and may be a metal plate such as aluminum. The support plate 35 can be applied not only to the examples shown in FIGS. 23 and 24 but also to other examples, but it is also possible to omit it from the examples of FIGS.

Furthermore, as another modification, the light emitting device 20 described above can be used alone without being combined with the lighting device 15 . Also in this example, the light-emitting device 20 can produce the atmosphere of the space S, and may be given the function of illuminating the space S.

Further, the above-described light-emitting device 20 has been described as constituting the wall w as the building material panel 3, but is not limited to this, and may constitute the ceiling c or the floor f. You may make it

As described above, the decorative sheet 40 and the surface light source device 50 may be handled as the assembly kit 4. That is, a combination of at least a portion of the optical member 55 of the surface light source device 50 and the decorative sheet 40 may be distributed or sold as an assembly kit 4 and installed in the building 1 or a moving object. In this example, the decorative sheet 40 and the surface light source device 50 that constitute the assembly kit 4 may be sequentially installed on the building 1 or the moving body to fabricate the structure 2, or the assembly kit 4 may be assembled first. The light emitting device 20 and the building material panel 3 are assembled using the decorative sheet 40 and the surface light source device 50, and then the assembled light emitting device 20 and building material panel 3 are installed in the building 1 or the moving body to produce the structure 2. You may make it

Although specific examples and modified examples of one embodiment have been described above, it is of course possible to appropriately combine and apply a plurality of examples.

1 Building 2 Structure 2a Decorative Surface 3 Building Material Panel 4 Assembly Kit 10 Lighting System 15 Lighting Fixture 20 Light Emitting Device 21 Auxiliary Building Material 22 Fastener 30 Board 30a Surface 31 Recess 33 Support 34 Support Frame 35 Support Plate 40 Decorative Sheet 40A First Decorative sheet 40B Second decorative sheet 40a Region 40b Region 50 Surface light source device 50a Light emitting surface 50b Main surface 50c Side surface 51 Light source 52 Light emitter 55 Optical member 56 Light diffusion sheet 57 Reflection sheet 58 Optical sheet 59 Adjustment sheet 59a Base material 59b Light absorption part 60 Light guide plate 60a Light exit surface 60b Back surface 60c Light entrance surface 60d Opposite surface 61 Extraction element 65 Light guide plate main body 65a Concavo-convex surface 65b Concave part 66 Light scattering layer 66a Support layer 66b Light scattering element 67 Light scattering element 68 Absorbing part 69 Reflection Part 70 Panel material d1 First direction s1 First side s2 Second side c Ceiling ca Recess w Wall wa Wall main body f Floor S Space Z1 Luminous area Z2 Non-luminous area

Claims (15)

a surface light source device having a light emitting surface;
a decorative sheet including a light-emitting region facing the light-emitting surface and a non-light-emitting region adjacent to the light-emitting region;
The surface light source device has a light guide plate and a light source facing an end face of the light guide plate from one side in a uniaxial direction,
the non-light-emitting region is adjacent to the light-emitting region from the other side in the uniaxial direction;
The illuminance X [lx] caused by the light emitted from the light emitting surface at any peripheral edge of the light emitting surface, and the visible light transmittance T [of the decorative sheet at the position facing the peripheral edge of the light emitting surface %], the visible light reflectance R [%], and the illuminance Z [lx] due to ambient light on the decorative sheet, which is the peripheral edge of the light emitting area facing the peripheral edge of the light emitting surface, A light-emitting device that satisfies the following formula (A').
1≦(X×T+Z×R)/(Z×R)<1.1 (A′) At least one of the amount of light emitted from the light emitting surface and the transmittance of the decorative sheet changes along one axis,
2. The light-emitting device according to claim 1, wherein said light-emitting region and said non-light-emitting region are aligned in said uniaxial direction. 3. The light emitting surface according to claim 1, wherein the amount of light emitted from a certain position on the light emitting surface is smaller than the amount of light emitted from another position on the light emitting surface located on one side of the light emitting surface in the one axial direction. A light emitting device as described. 4. The light guide plate according to any one of claims 1 to 3, wherein the end region on the other side in the uniaxial direction includes a reflecting portion having visible light reflectivity or an absorbing portion having visible light absorptivity. 1. The light-emitting device according to item 1 . The visible light transmittance of the decorative sheet at a certain position is lower than the visible light transmittance of the decorative sheet at another position located on one side of the position in the uniaxial direction. 5. The light emitting device according to any one of 1 to 4 . The light-emitting device according to any one of claims 1 to 5, further comprising a board arranged to face at least the non-light-emitting region. 7. The light-emitting device according to claim 6 , wherein said light-emitting surface of said surface light source device is positioned on the same plane as the surface of said board facing said non-light-emitting region. The board is arranged facing both the non-light-emitting area and the light-emitting area,
8. The light-emitting device according to claim 6 , wherein said board is provided with a recess for housing said surface light source device at a position facing said light-emitting region. The surface light source device includes a main surface including the light emitting surface and a side surface adjacent to the main surface,
The light emitting device according to any one of claims 1 to 8 , wherein the decorative sheet is arranged to face the main surface and the side surface of the surface light source device. The light-emitting device according to any one of claims 1 to 9 , wherein the area of the light-emitting region of the decorative sheet is 15% or less of the total area of the decorative sheet. The light-emitting device according to any one of claims 1 to 10, which is installed on a wall of a room, and the area of said light-emitting region of said decorative sheet is 15% or less of the total area of said wall. An assembly kit for the light emitting device according to any one of claims 1 to 11 ,
the decorative sheet;
and an optical member forming the light emitting surface. A building material panel comprising the light emitting device according to any one of claims 1 to 11 or the assembly kit according to claim 12 . 14. A structure comprising the building panel of claim 13 . A method of manufacturing a structure, comprising the step of installing the assembly kit according to claim 12 .

Images