JP2021185583A - Light-emitting device, assembly kit, building material panel, structure and method for manufacturing structure - Google Patents

Abstract

To provide a light-emitting device that effectively presents an atmosphere of a space without making a user aware of the presence of a light source.SOLUTION: A light-emitting device 20 includes: a surface light source device 50 with a light-emitting surface 50a; and a decorative sheet 40 including a light-emitting region Z1 facing the light-emitting surface 50a and a non-light-emitting region Z2 adjacent to the light-emitting region.SELECTED DRAWING: Figure 2

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 Document 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 a decorative surface of a ceiling or a wall which is a structure. According to such an indirect lighting device, the light from a light source that is concealed and cannot be directly seen is directed not to the space but to the structure that divides the space, thereby emphasizing the expanse of the space. can do.

Japanese Unexamined Patent Publication No. 2011-210594

However, in the light emitting device disclosed in Patent Document 1, the housing accommodating the light source protrudes toward the space. Therefore, although the light source is concealed and invisible, the existence of the light source can be easily grasped. For this reason, the conventional light emitting device does not go beyond the range of a device that artificially illuminates the decorative surface of the structure, and cannot sufficiently produce and enhance the atmosphere of the space.

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.

The light emitting device according to the present disclosure is
A surface light source device having a light emitting surface and
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 is provided.

The light emitting device according to the present disclosure is
A surface light source device having a light emitting surface and
A decorative sheet arranged so as to face the light emitting surface in a part thereof is provided.

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 the uniaxial direction.
The light emitting region and the non-light emitting region may be arranged side by side 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 less than the amount of light emitted from another position on the light emitting surface located on one side in the uniaxial direction from the position.
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 of the light emitting surface is equal to or less than the amount of light emitted from another position of the light emitting surface located on one side in the uniaxial direction from the position. You may do so.

In the light emitting device according to the present disclosure
The surface light source device includes a light guide plate and a light source facing the light guide plate from one side 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 light guide plate may include a reflecting portion having visible light reflectivity or an absorbing portion having visible light absorption in the end region on 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 illuminants arranged in a uniaxial direction.
The luminous flux of one illuminant is lower than the luminous flux of another illuminant located on one side in the uniaxial direction of the illuminant.
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 luminous flux [lm] of one illuminant arbitrarily selected is the luminous flux of another illuminant located on one side in the uniaxial direction with respect to the one illuminant. It may be less than or equal to [lm].

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 in the uniaxial direction from the position.
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 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. It may be less than or equal to the rate.

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 portion of the light emitting surface and the decorative sheet at a position facing the peripheral portion of the light emitting surface. The visible light transmittance T [%] and the visible light reflectance R [%] 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 [lp] caused by the light emitted from the light emitting surface at any peripheral portion of the light emitting surface and the peripheral portion of the light emitting region facing the peripheral portion of the light emitting surface. The visible light transmittance T ₁ [%] of the decorative sheet in the above, the visible light reflectance R ₁ [%] of the decorative sheet in the peripheral portion of the light emitting region, and adjacent to the peripheral portion of the light emitting region. wherein said visible light reflectance R _{2 [%]} of the decorative sheet at the periphery of the non-emitting regions, but 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 so as to face 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 located on the same surface 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 region and the light emitting region.
The board may be provided with a recess for accommodating the surface light source device at a position facing the light emitting region.

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 with respect to the total area of the decorative sheet.

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

The assembly kit according to this disclosure is
An assembly kit used for any of the light emitting devices according to the present disclosure described above.
With the decorative sheet
It includes an optical member that forms the light emitting surface.

The building material panel according to the present disclosure comprises any of the light emitting devices according to the present disclosure described above or any assembly kit according to the present disclosure described above.

The structure according to the present disclosure comprises any of the building material panels according to the present disclosure described above.

The method for manufacturing a structure according to the present disclosure includes a step of installing any of the assembly kits according to the present disclosure described above.

According to the present invention, the atmosphere of the space can be effectively produced.

FIG. 1 is a diagram for explaining one embodiment, and is a perspective view showing a lighting system. FIG. 2 is a vertical sectional view of FIG. FIG. 3 is a front view showing a light emitting device included in the lighting system of FIG. FIG. 4 is a vertical sectional view showing a specific example of a surface light source device of a light emitting device included in the lighting system of FIG. 1. FIG. 5 is a view corresponding to FIG. 4, and is a vertical sectional view showing another specific example of the surface light source device. FIG. 6 is a view corresponding to FIG. 4, and is a vertical sectional view showing still another specific example of the surface light source device. FIG. 7 is an enlarged vertical sectional view showing a part of a light emitting device included in the lighting system of FIG. 1. FIG. 8 is a view corresponding to FIG. 4, and is a vertical sectional view showing still another specific example of the surface light source device. FIG. 9 is a view corresponding to FIG. 4, and is a vertical sectional view showing still another specific example of the surface light source device. FIG. 10 is a diagram corresponding to FIG. 4, and is a vertical sectional view showing still another specific example of the surface light source device. FIG. 11 is a view corresponding to FIG. 4, and is a vertical sectional view showing still another specific example of the surface light source device. FIG. 12 is a view corresponding to FIG. 4, and is a vertical sectional view showing still another specific example of the surface light source device. FIG. 13 is a view corresponding to FIG. 2 and is a vertical sectional view showing another specific example of the light emitting device. FIG. 14 is a view corresponding to FIG. 2 and is a vertical sectional view showing still another specific example of the light emitting device. FIG. 15 is a view corresponding to FIG. 3 and is a front view showing the light emitting device of FIG. FIG. 16 is a view corresponding to FIG. 2 and is a vertical sectional view showing still another specific example of the light emitting device. FIG. 17 is a view corresponding to FIG. 2 and is a vertical sectional view showing still another specific example of the light emitting device. FIG. 18 is a view corresponding to FIG. 2 and is a vertical sectional view showing still another specific example of the light emitting device. FIG. 19 is a view corresponding to FIG. 2 and is a vertical sectional view showing still another specific example of the light emitting device. FIG. 20 is a view corresponding to FIG. 2 and is a vertical sectional view showing still another specific example of the light emitting device. FIG. 21 is a view corresponding to FIG. 2 and is a vertical sectional view showing still another specific example of the light emitting device. FIG. 22 is an exploded perspective view showing the surface light source device of FIG. 20. FIG. 23 is a view corresponding to FIG. 2 and is a vertical sectional view showing still another specific example of the light emitting device. FIG. 24 is a view corresponding to FIG. 2 and is a vertical 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 surface of the surface light source device according to Samples 1 to 4. 26 (a) to 26 (d) are photographs taken of the decorative sheet of the light emitting device with the light emitting device according to the samples 1 to 4, respectively.

Hereinafter, an embodiment of the present disclosure will be described with reference to the drawings. In the drawings attached to the present specification, the scale and the aspect ratios are appropriately changed and exaggerated from those of the actual product for the convenience of illustration and comprehension.

In addition, terms such as "parallel", "orthogonal", and "identical" that specify shapes, geometric conditions, and their degrees as used in the present specification are not limited to a strict meaning. The interpretation shall include the range in which similar functions can be expected.

Moreover, in the present specification, the terms "sheet", "film", and "board" are not distinguished from each other based solely on the difference in designation. For example, "board" is a concept that includes members that can be called sheets or films. Therefore, the "light guide plate" is not distinguished only by the difference in the names of "light guide sheet" and "light guide film".

Further, the "sheet surface (film surface, plate surface)" is a target sheet-like (film-like, plate-like) member when the target sheet-like (film-like, plate-like) member is viewed as a whole and in a broad sense. It refers to the surface that coincides with the plane of the plate-shaped member. The normal direction for the sheet-shaped (film-shaped, plate-shaped) member is the normal direction for the sheet-shaped (film-shaped, plate-shaped) member to the sheet surface (film surface, plate-shaped). Point to.

1 to 26 are diagrams for explaining a plurality of specific examples of one embodiment. Of these, FIGS. 1 and 2 are perspective views or vertical sectional views showing an example of the lighting system 10, respectively. The lighting system 10 in the present embodiment is a device used for lighting and directing the space S at least partially partitioned 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 incorporated in the structure 2. The light emitting device 20 includes a decorative sheet 40 that forms a decorative surface 2a 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 region Z1 facing the light emitting surface 50a of the surface light source device 50 and a non-light emitting region Z2 adjacent to the light emitting region Z1. In this way, apart from the lighting fixture 15 whose main purpose is to improve the brightness of the space S, the decorative surface 2a of the structure 2 is transmitted and illuminated by the light emitting device 20, so that the space S can be expanded with respect to the finite space S. Can be given. In particular, the light emitting region Z1 of the light emitting device 20 can be limited to a limited range, and the surface light source device 50 that is the light source of the light emitting device 20 can be concealed by the decorative sheet 40. By this device, the space S can be produced in a state where the presence of the light source is effectively diluted, which makes it possible to effectively enhance the atmosphere of the space S.

In particular, in the illustrated embodiment, the structure 2 includes a ceiling c, a wall w, and a floor f as components of the building 1. The luminaire 15 is attached to the ceiling c. The light emitting device 20 constitutes a wall w as a building material panel 3. The light emitting device 20 is also provided with an optical device, which will be described later, in order to make the presence of the surface light source device 50 more effective and inconspicuous. As a result, the light emitting device 20 can produce a calm atmosphere while emphasizing the expanse of the space, and as a result, can bring added value such as luxury and comfort to the space S.

Hereinafter, one embodiment will be described in detail based on the illustrated specific example.

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

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

In one specific example shown in FIG. 2, the light emitting device 20 has an auxiliary building material 21, a fastener 22, and a board 30 in addition to the decorative sheet 40 and the surface light source device 50. FIG. 3 is a front view showing the light emitting device 20 shown in FIG. Further, FIG. 4 is a vertical sectional view showing an example of the surface light source device 50. Hereinafter, the light emitting device 20 will be described with reference to FIGS. 2 to 4.

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 2a of the structure 2. Then, the decorative sheet 40 forms a surface on the most emitted light side of the light emitting device 20. As the decorative sheet 40, wallpaper of a building, interior materials such as floors and ceilings, interior materials of moving objects such as vehicles, members forming the outermost surface of furniture, electrical equipment, and the like can be used.

As described above, the decorative sheet 40 includes a light emitting region Z1 facing the light emitting surface 50a of the surface light source device 50 and a non-light emitting region Z2 displaced 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 back surface side by the surface light source device 50 in the light emitting region Z1. The decorative sheet 40 has visible light transmission at least in the light emitting region Z1. Therefore, at least a part of the light emitted from the light emitting surface 50a 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 thus transmitted and illuminated, a white wallpaper having a relatively high transmittance is preferably used as the decorative sheet 40. However, even a wallpaper having a relatively low transmittance, for example, a wood grain wallpaper, can be sufficiently effectively transmitted and illuminated to exert 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. For the visible light transmittance, an infrared visible ultraviolet spectrophotometer (UV3100PC manufactured by Shimadzu Corporation) was used, and the spectral transmittance in the wavelength range of 380 nm or more and 780 nm or less was measured according to JIS A5759-2008, and the same standard was applied. It is calculated by the specified formula.

As shown in FIG. 3, the light emitting region Z1 and the non-light emitting region Z2 are arranged in the 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. Further, in the example shown in FIG. 3, two light emitting devices 20 are arranged in a direction non-parallel to the uniaxial direction. More specifically, the light emitting region Z1 and the non-light emitting region Z2 are arranged in the first direction d1. This first direction d1 is along the vertical direction in the illustrated specific 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. Further, the two light emitting devices 20 are arranged in the 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 region Z1 and the non-light emitting region 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 described. As shown in FIG. 2, the board 30 is a plate-shaped 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 region Z2 and the light emitting region Z1. The board 30 is provided with a recess 31 at a position facing the light emitting region Z1. The surface light source device 50 is housed in the recess 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 the surface light source device 50 is fixed on the board 30. Further, the board 30 and the surface light source device 50 may be fixed by a bonding layer containing an adhesive, an adhesive, or the like in addition to the fastener 22 or instead of the fastener 22.

The light emitting surface 50a of the surface light source device 50 is preferably located on the same surface as the surface 30a of the board 30 facing the non-light emitting region Z2 of the decorative sheet 40. The decorative sheet 40 is laminated on the board 30 and the surface light source device 50 positioned in this way. In this case, it becomes difficult to form a step 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 fact that this step is visually recognized through the decorative sheet 40. Can be effectively suppressed. Further, 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 described later becomes more remarkable.

The board 30 is determined according to the use of the decorative sheet 40. When the decorative sheet 40 forms a member for decorating the surface of a wall, floor, ceiling, etc., as an example, the board 30 is made of a single board made of wood of seed trees, plywood, laminated wood, a perchle board, a wooden board, or the like. It is a plate material, a cement-based material such as concrete or mortar, a gypsum board, an inorganic non-plywood board made of calcium silicate or the like, or a metal board made of iron, aluminum or the like. When the decorative sheet 40 forms an interior material for a moving body such as a vehicle, the board 30 is, for example, a resin plate material or a metal plate. When the decorative sheet 40 forms furniture or an electric product, the board 30 is, for example, a wooden board material or a resin board material. In the application of the light emitting device 20 to the building material panel 3, it is preferable that the board 30 has flame resistance and fire resistance.

In addition, in FIG. 2 and FIGS. 13, 14, 16 to 20 corresponding to FIG. 2, the decorative sheet 40 is placed between the board 30 and the surface light source device 50 according to the illustration of the fastener 22. Illustrated with a gap. However, it 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 joint portion 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. As the auxiliary building material 21, members called "circumferential edges" and "skirting boards" can be used. However, as will be described later, it is also possible to omit the auxiliary building material 21. 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 configured to be removable for replacement.

Next, the surface light source device 50 that illuminates the decorative sheet 40 from the back surface 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 so that its light emitting surface 50a faces only a part of the decorative sheet 40. As the surface light source device 50, various devices capable of emitting planar light can be used. For example, a device having a light source 51 and an optical member 55 that converts the 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. The surface light source device 50 shown in FIG. 4 is configured as an edge light type surface light source device. The surface light source device 50 includes 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 emitting body 52 that emits light. The light emitting body 52 is not particularly limited, and various members that emit light can be widely used. Specifically, for example, a cold cathode fluorescent lamp, a point-shaped light emitting diode (LED), an incandescent light bulb, a laser oscillator, or the like can be used as the light emitting body 52 of the light source 51. In the illustrated example, the light source 51 has a plurality of point-shaped light emitters 52. The light emitting body 52 is composed of, for example, a light emitting diode. In the examples 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. When the auxiliary building material 21 is removable, the plurality of light emitting bodies 52 can be removed from the wall w together with the auxiliary building material 21 to replace a part or all of the plurality of light emitting bodies 52.

The light guide plate 60 is a plate-shaped member having a pair of main surfaces 60a and 60b and a side surface located between the pair of main surfaces 60a and 60b. One main surface forms the light emitting surface 60a, and the other main surface forms the back surface 60b. The main surfaces 60a and 60b typically have a rectangular shape in a 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 surface includes an incoming surface 60c and an opposite surface 60d facing the first direction d1.

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

As shown in FIG. 4, the light emitted from the light source 51 enters the light guide plate 60 and travels in the light guide plate 60. The light guide plate 60 includes a take-out element 61. The extraction element 61 changes the traveling direction of the light L41 and L42 traveling in the light guide plate 60. In this surface light source device 50, the light emitted from the light source 51 enters the light guide plate 60 from the light incoming surface 60c and travels in the light guide plate 60 by being reflected, especially totally reflected. The light L41 and L42 traveling in the light guide plate 60 change the traveling direction by the extraction element 61, and in particular, are scattered so that the light L41 and L42 are incident on the pair of main surfaces 60a and 60b of the light guide plate 60 at an incident angle less than the total reflection critical angle. It is possible to enter and exit from the light guide plate 60.

The light whose traveling direction is changed by the extraction element 61 is emitted from the light guide plate 60 via any of the pair of main surfaces 60a and 60b. A light diffusion sheet 56 is provided facing the light emitting surface 60a of the light guide plate 60. The lights L41 and L42 emitted from the light emitting surface 60a of the light guide plate 60 are then incident on the light diffusion sheet 56. The light diffusing sheet 56 has a light diffusing function, and can arrange the luminance angle distribution caused by the transmitted light. The light diffusion sheet 56 forms a light emitting surface 50a of the surface light source device 50. The light diffused by the light diffusing sheet 56 is emitted from the surface light source device 50 and directed toward the decorative sheet 40. For the light diffusion sheet 56, various configurations capable of exhibiting the light diffusion function can be adopted. The diffusion characteristics of the light diffusion sheet 56 may be isotropic or anisotropic.

A reflective sheet 57 is provided facing the back surface 60b of the light guide plate 60. The reflective sheet 57 can reflect the light emitted from the back surface 60b and direct it toward the light guide plate 60 and the light diffusion sheet 56. By providing the reflective sheet 57, the amount of light emitted from the light emitting surface 50a of the surface light source device 50 can be increased. This makes it possible to improve the utilization efficiency of the light emitted from the light source 51. As the reflective sheet 57, various configurations capable of exhibiting the light reflection function can be adopted. The reflection characteristic of the reflective sheet 57 may be specular reflection or diffuse reflection. The diffuse reflection property of the reflective sheet 57 may be isotropic or anisotropic.

As the extraction element 61, various elements that can change the traveling direction of the light traveling in the light guide plate 60 can be used. In the example shown in FIG. 4, the light guide plate 60 has a plate-shaped light guide plate main body 65. The light guide plate main body 65 has an uneven surface 65a 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 the uneven surface 65a. The uneven surface 65a is formed by providing a concave portion 65b in the light guide plate main body 65. In this example, the light guide plate body 65 may be formed of a resin having visible light transmittance.

As another example, the extraction element 61 can be a light scattering layer 66 laminated on the light guide plate main body 65, as shown in FIG. In the example shown in FIG. 5, the light guide plate 60 has a light guide plate main body 65 and a light scattering layer 66. The light scattering layer 66 has a support layer 66a that functions as a binder, and a light scattering element 66b dispersed in the support layer 66a. The support layer 66a can be formed of a resin having visible light transmission. The light scattering element 66b has a function of changing the traveling direction of light traveling in 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 formed of a material having light reflectivity such as metal. Specific examples of the light scattering element 66b include a metal compound, a porous substance containing a gas, resin beads holding the metal compound in the surroundings, white fine particles, bubbles, and particles having a refractive index different from that of the surroundings. In the example shown in FIG. 5, the lights L51 and L52 traveling in the light guide plate 60 due to reflection on the light emitting surface 60a and the back surface 60b change the traveling direction by colliding with the light scattering element 66b in the light scattering layer 66. After that, it becomes possible to emit light from the light guide plate 60.

In the example of FIG. 5, the refractive index of the support layer 66a of the light scattering layer 66 is preferably equal to or higher than the refractive index of the light guide plate main body 65. When the refractive index of the support layer 66a of the light scattering layer 66 is lower than the refractive index of the light guide plate main body 65, the light L53 traveling in 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. Therefore, it may not be possible to enter the light scattering layer 66. After the light L53 is incident on the light guide plate 60 from the light entry surface 60c, it travels inside 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 taken out. It can function more effectively as element 61.

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

Further, the light guide plate 60 may include a plurality of types of extraction elements 61. In the example shown in FIG. 6, the 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 constituting the back surface 60b of the light guide plate 60.

Further, the light scattering ability caused by the extraction element 61 in each region of the light guide plate 60 is not constant and may be different. That is, the light scattering ability of the light guide plate 60 may be changed in each region along the plate surface. In other words, the light scattering ability of the light guide plate 60 in a certain region may be different from the light scattering ability in another region deviated from the region along the plate surface. By changing the light scattering ability 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 ability is the strength of the ability of the light guide plate 60 to scatter the light passing through the inside thereof. As an example, the degree of light scattering ability can be evaluated using a haze value [%] measured according to JIS-K7361-1, and a high haze value [%] means that the light scattering ability is high. It will be. Therefore, in the illustrated example, the transmission haze value transmitted in the normal direction to the plate surface of the light guide plate 60 is not constant in each region of the light guide plate 60 and has different values. The haze value [%] can be measured by a method compliant with JIS K7136 using a haze meter (manufactured by Murakami Color Technology Laboratory, product number; HM-150).

As shown in FIG. 4, when the extraction element 61 has irregularities 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 irregularities are provided. By increasing the ratio, that is, the area ratio, the light scattering ability can be increased. Further, when the extraction element 61 is a concave-convex surface 65b or a concave-convex surface 65a formed by 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, the light scattering ability can be increased by increasing the value of H1 / H2. When the extraction element 61 includes the light scattering elements 66b and 67 contained in the light guide plate 60, the volume ratio of the light scattering elements 66b and 67 in the light guide plate 60 is increased, the particle density is increased, and the particle size is increased. The light scattering ability can be increased by increasing the difference in the refractive index of the interface formed by the light scattering elements 66b and 67.

When the light emitting device 20 includes the light guide plate 60, it is preferable that the pair of main surfaces of the light guide plate 60, that is, the light emitting surface 60a and the back surface 60b of the light guide plate 60 are 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, and the hard coat layer has a light emitting surface 60a and a back surface 60b. Either one or both may be formed. Further, in the example shown in FIG. 5, the support layer 66a of the light scattering layer 66 is formed of a material having a hardness higher than that of the light guide plate main body 65, so that the light scattering layer 66 functions as a hard coat layer. good.

By the way, in order to make the effect described later, that is, the effect of the light emitting device 20 on the atmosphere of the space S more remarkable, it is effective that the presence of the surface light source device 50 is not conspicuous. Then, 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 changes along the first direction d1 which is the arrangement direction of the light emitting region Z1 and the non-light emitting region Z2. Was confirmed to be effective.

More specifically, the amount of light emitted from a certain position on the light emitting surface 50a is larger 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 from that position. It is preferable that the amount is reduced. 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 emitted light from an arbitrarily selected position of the light emitting surface 50a is equal to or less than the amount of emitted light from another position of 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 region Z2 located on the second side s2 in the first direction d1.

Such a preferable emission light amount distribution in the first direction d1 controls the distribution of the extraction element 61 in the first direction d1 as described above, and determines the degree of light scattering ability caused by the extraction element 61 in the first direction d1. It can be realized by adjusting along. Further, in the edge light type surface light source device 50 described with reference to FIGS. 4 to 6, the light input surface 60c of the light guide plate 60 is located on the first side s1 in the first direction d1, and the opposite surface 60d is the first. 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 to the light input surface 60c side along the first direction d1 which is the light guide direction. It gradually decreases toward the surface 60d side. That is, in such a surface light source device 50, even if the light scattering ability due to the extraction element 61 is uniform along the first direction d1, a preferable emission light amount distribution in the first direction d1 described above is realized. be able to.

In addition, in FIGS. 1 and 3 and FIG. 15 which will be referred to later, the amount of emitted light from the light emitting device 20 is shown by shading, and the region where the amount of emitted light is large is represented by “dense”.

Further, if the illuminance X [lx] at the peripheral edge of the light emitting surface 50a caused by 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 found. Specifically, when the illuminance X [lx] caused by the light emitted from the light emitting surface 50a on any peripheral portion of the light emitting surface 50a satisfies the following formula (A), it overlaps with the peripheral portion. It is possible to effectively make it difficult to detect the presence of the surface light source device 50 concealed by the decorative sheet 40 at the position.
1 ≦ (X × T + 300 × R) / (300 × R) <1.1 ・ ・ ・ (A)
Here, "X" in the formula (A) is the illuminance [lp] at the peripheral portion of the light emitting surface 50a caused by the light emitted from the surface light source device 50, and "T" faces the peripheral portion. It 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 portion. The illuminance was measured by using an illuminance meter TR-74Ui manufactured by T & D Co., Ltd. and bringing the illuminance sensor of this illuminance meter into close contact with the peripheral edge of the light emitting surface 50a. Visible light transmittance [%] and visible light reflectance [%] are measured in the wavelength range of 380 nm to 780 nm according to JIS A5759-2008 using an infrared visible ultraviolet spectrophotometer (UV3100PC manufactured by Shimadzu Corporation). The spectral transmittance or the spectral reflectance is measured and calculated by the calculation formula specified in the standard.

As described above, the decorative sheet 40 includes a light emitting region Z1 facing the light emitting surface 50a of the surface light source device 50 and a non-light emitting region Z2 not facing the light emitting surface 50a. The brightness of the surface of the light emitting device 20 depends on the amount of light traveling 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 the light L71 transmitted through the decorative sheet 40 of the illumination light Ll emitted from the light emitting surface 50a of the surface light source device 50 and the makeup of 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 among the ambient light Le. Then, in an environment in which the light emitting device 20 described here is assumed to be suitable, that is, in an environment in which the atmosphere in the indoor space using the light emitting device 20 can be effectively improved, the decorative surface when the lamp is turned on. The illuminance on 2a is typically 300 [lx] or more. Therefore, "(X x T + 300 x R)" in the formula (A) is an index representing the brightness sensed at the peripheral edge of the light emitting region Z1 of the decorative sheet 40, and "300 x R" in the formula (A) is. , It is an index showing the brightness perceived in the non-light emitting region Z2 of the decorative sheet 40. 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 the formula (A) is satisfied in any peripheral portion of the light emitting region Z1, at least the peripheral portion is bright enough to be indistinguishable from the non-light emitting region Z2 with the naked eye. As a result, the presence of the surface light source device 50 concealed by the decorative sheet 40 at least in the peripheral portion is effectively inconspicuous.

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

Considering that the person who is the main body of the judgment makes a judgment with the naked eye, the peripheral edge 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 obtain the effect of making the presence of the surface light source device 50 inconspicuous sufficiently effectively.

Further, in the above-mentioned formula (A), it is assumed that changes in the visible light transmittance T [%] and the visible light reflectance R [%] are negligible in the decorative sheet 40. However, in the case of strict evaluation, the evaluation may be performed by the following formula (B) instead of the above-mentioned formula (A).
1 ≦ (X × T ₁ +300 × R ₁ ) / (300 × R ₂ ) <1.1 ・ ・ ・ (B) Here, “X” in the equation (B) is the light emitted from the surface light source device 50. The resulting illuminance at the peripheral edge of the light emitting surface 50a, "T ₁ " is the visible light transmittance of the decorative sheet 40 at the peripheral edge of the light emitting region Z _{1 facing the peripheral edge, and "R 1} " is. a visible light reflectance of the decorative sheet in the periphery [%], "R _2" is visible light reflection of the decorative sheet 40 in the periphery of the non-light-emitting region Z2 adjacent to the periphery of the light emitting region Z1 The rate [%]. Visible light transmittance [%] and visible light reflectance [%] are measured in the wavelength range of 380 nm to 780 nm according to JIS A5759-2008 using an infrared visible ultraviolet spectrophotometer (UV3100PC manufactured by Shimadzu Corporation). The spectral transmittance or the spectral reflectance is measured and calculated by the calculation formula specified in the standard.

Further, in the formula (A) and the formula (B), as described above, the typical illuminance on the wall surface when the lamp is turned on is adopted. In the specific application of the light emitting device 20, the following equations (A') and (B') adopting the actual illuminance in the applied space are converted into the equation (A) or the equation (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') Here, “X”, “T” and “R” in the equation (A') Is the same as "X", "T" and "R" in the above formula (A). On the other hand, "Z" in the formula (A') is the illuminance [lx] caused by the ambient light on the decorative sheet 40 which is the peripheral edge of the light emitting region Z1 facing the peripheral edge of the light emitting surface 50a. Similarly, Formula (B ') "X" in, _{"T 1", "R 1"} and _{"R 2"} is "X" in the above formula (B), _{"T 1", "R 1"} or Same as "R _{2". On the other hand, "Z 1} " in the formula (B') is the illuminance [lx] caused by the ambient light Le on the decorative sheet 40 which is the peripheral edge of the light emitting region Z 1 facing the peripheral edge of the light emitting surface 50a. _{"Z 2} " in the formula (B') is the illuminance [lx] caused by the ambient light Le on the decorative sheet 40 which is the peripheral edge of the non-light emitting region Z2 adjacent to the peripheral edge of the light emitting region Z1.

Here, the experimental results of actually producing the samples 1 to 4 of the light emitting device 20 shown in FIG. 2 and confirming whether 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 have the same configuration as the light emitting device 20 shown in FIG. The surface light source device 50 is an edge light type and has a reflection sheet 57, a light guide plate 60, a light diffusion sheet 56, and a light source 51 as shown in FIG. Different light guide plates 60 were used between Samples 1 to 4, but the other components were the same. For example, the light source 51, the light diffusing sheet 56, the reflective sheet 57, and the decorative sheet 40 of the surface light source device 50 are common among the samples 1 to 4.

In Samples 1 and 3, as shown in FIG. 5, the light guide plate 60 has a plate-shaped 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. I made it. In Sample 3, the light scattering layer 66 was used as a solid layer, and the light scattering layer 66 was provided on the entire surface of the main surface of the light guide plate body 65 on the reflection sheet 57 side. On the other hand, in sample 1, the occupied area ratio of the light scattering layer 66 is set to d1 in the first direction so that the light diffusing ability gradually weakens from the first side s1 to the second side s2 along the first direction d1. Along the way, it gradually decreased from the first side s1 to the second side s2.

In the sample 2 and the sample 4, the light guide plate main body 65 of FIG. 4 having the recess 65b formed on the main surface on the reflective sheet 57 side was used as the light guide plate 60. That is, in Sample 2 and Sample 4, the back surface 60b of the light guide plate 60 was designated as the uneven surface 65a. The recess 65b is uniformly provided on the entire surface of the back surface 60b. In the sample 2, a recess 65b having a deeper depth and a larger planar shape than the sample 4 is provided.

In Samples 1 to 4, the light source of the surface light source device 50 has a plurality of light emitting diodes arranged at equal intervals along the light entry surface 60c of the light guide plate 60, as shown in FIGS. 2 and 3. ..

The decorative sheet 40 is a white wallpaper. The visible light transmittance of the decorative sheet 40 was substantially constant on the entire surface thereof, 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 illuminance measurement result caused only by the light source light on the light emitting surface 50a of the surface light source device 50 in each sample.

Further, whether or not the boundary between the light emitting region Z1 and the non-light emitting region Z2 can be visually recognized in a state where the samples 1 to 4 are installed in an environment where the illuminance is 495 [lx] and the surface light source device 50 emits light. The results of confirming this are shown in Table 1. In the "confirmation result" column of Table 1, "x" is added to the sample in which the position of the boundary between the light emitting region Z1 and the non-light emitting region Z2 is visually recognized, and the boundary between the light emitting region Z1 and the non-light emitting region Z2 is marked. "○" is attached to the sample whose position is not visually recognized. Further, as shown in the column of "confirmation photograph" in Table 1, photographs of the surface of the light emitting device 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).

Further, the visible light transmittance T of the decorative sheet 40 is 12.53 [%], the visible light reflectance R of the decorative sheet 40 is 77.10 [%], and the decorative sheet 40 facing the peripheral edge of the light emitting surface 50a. It was confirmed whether or not the formula (A') was satisfied by setting the illuminance Z caused by the ambient light at the upper position to 495 [lx]. In the column of "ratio value" in Table 1, the value of "(X × T + Z × R) / (Z × R)" in the formula (A') is described. Further, in the "conditional expression" column in Table 1, "○" is added to the sample in which the expression (A') is satisfied, and "x" is added to the sample in which the expression (A') is not satisfied. Was attached. The results shown in Table 1 demonstrate the effectiveness of formula (A').

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

By yet another device, the boundary between the light emitting region Z1 and the non-light emitting region Z2 can be made inconspicuous.

As described above, in the edge light type surface light source device 50, the light emitted from the light source 51 is incident on the light guide plate 60 via the light incoming surface 60c. The light incident on the light guide plate 60 travels in the light guide plate 60 from the side of the light entering surface 60c to the side of the opposite surface 60d. The light traveling in the light guide plate 60 collides with the extraction element 61 and is emitted from the light guide plate 60. However, there is also light that reaches the opposite surface 60d 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. The presence of such light may allow the area of the decorative sheet 40 facing the opposite surface 60d of the light guide plate 60 to be observed brightly, making it easier to detect the presence of the surface light source device 50.

In order to prevent the occurrence of such a defect, in the examples shown in FIGS. 8 and 9, the light guide plate 60 has visible light absorption in the end region on the second side s2 in the first direction d1. The absorption unit 68 is included. The absorption unit 68 can be a layer containing, for example, a pigment having visible light absorption, for example, carbon black or titanium black. In the example shown in FIG. 8, the absorption unit 68 covers the end surface of the second side s2 of the light guide plate main body 65. 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. The absorbing portion 68 is provided on this inclined surface. The absorption unit 68 absorbs the light L81 and L91 that have traveled through the light guide plate main body 65 to the end region of the second side s2, so that the generation of leakage light from the opposite surface 60d can be prevented.

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 serving as the second side s2 in the first direction d1. The reflective portion 69 can be formed by using a material having a high reflectance such as silver or aluminum. In the example shown in FIG. 10, the reflecting portion 69 covers the end surface of the second side s2 of the light guide plate main body 65. The reflecting unit 69 reflects the light L101 that has traveled through the light guide plate main body 65 to the end region of the second side s2, so that the traveling direction of the light L101 is folded back along the first direction d1. The light L101 subsequently becomes light that can be effectively used by colliding with the extraction element 61. That is, by providing the reflecting portion 69, it is possible to effectively prevent the leakage of light from the opposite surface 60d, and it is possible to effectively improve the utilization efficiency of the light emitted from the light source 51.

Further, according to the example shown in FIG. 11, the leakage of light from the opposite surface 60d can be effectively prevented. 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 the first direction d1 from the first side s1 to the second side s2. Further, in this light guide plate 60, there is substantially no opposite surface 60d facing the light entering surface 60c along the first direction d1.

The light L111 traveling from the first side s1 to the second side s2 in the light guide plate 60 shown in FIG. 11 has a main surface 60a because the thickness of the light guide plate 60 becomes thinner toward the second side s2. , 60b is likely to be incident. That is, the frequency with which the 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 during a certain distance along the first direction d1 is in the second side s2. It gets higher. Then, in the light guide plate 60 shown in FIG. 11, the angle of incidence of the light traveling in 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 extraction element 61, and the main surfaces 60a and 60b are easily incident on the second side s2. In addition, in this light guide plate 60, there is substantially no opposite surface 60d facing the light entering surface 60c along the first direction d1. From the above, the light guide plate 60 shown in FIG. 11 can also effectively prevent light from leaking from the end region of the second side s2, which is on the opposite side of the light entering 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 above configuration will be described.

The illustrated lighting system 10 includes a luminaire 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 extinguished state in which the surface light source device 50 does not emit light. For example, in the example shown in FIG. 1, the light emitting device 20 is incorporated in only one wall w located in the middle of the three walls w shown in the figure, but the light emitting device 20 is extinguished. In some cases, the three walls can be perceived as identical. That is, the application of the lighting system 10 does not impair the design originally possessed by the space S or the structure 2.

1 and 3 show a 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 part of the decorative sheet 40, that is, faces only the light emitting region Z1. Then, the light emitting region Z1 of the decorative sheet 40 emits light to give a sense of depth to the space S. That is, the expanse can be emphasized in the finite space S. Such an action effect is that the light emitting region Z1 is arranged offset to the 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 oriented, for example, as in the illustrated example. By arranging in d1, it becomes more effective. However, the present invention is not limited to such an example, and for example, from the viewpoint of emphasizing the improvement of design, the light emitting region Z1 may be dispersedly arranged on the decorative sheet 40.

It should be noted that the lamp for illuminating the structure is also proposed by Japanese Patent Application Laid-Open No. 2011-210594, which has already been mentioned, as a lamp for realizing lighting called, for example, a “wall washer”. However, the conventional lamp is housed in a housing protruding into the space or in a recess formed in the ceiling. For this reason, there are problems such as a large installation space and time and effort for installation. In addition, in the prior art, the position of the light source can be intuitively grasped, and since the light source can be seen directly, it is grasped as artificial lighting, and the effect for emphasizing the size does not function as expected. rice field.

On the other hand, in the present embodiment, the surface light source device 50 is concealed by the decorative sheet 40. Therefore, the surface light source device 50 is not visible. Further, since the thickness of the surface light source device 50 can be set to several cm, a large installation space is not required. Further, it is not necessary to create and secure an installation space such as a special housing or a special recess.

Further, unlike the illumination by light projection from a light source in the prior art, in the present embodiment, the transmitted illumination of the decorative sheet 40 using the surface light source device 50 is adopted. In the prior art, there are restrictions on the setting of the illuminated area on the structure according to the projection direction of light, but in the present embodiment, the light emitting area Z1 on the decorative sheet 40 is 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 in the light emitting region Z1 is significantly improved. As a result, the emitted light amount distribution along the first direction d1 in the above-mentioned light emitting region Z1, that is, the emitted light amount 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 such an embodiment, it is possible to make the presence of the surface light source device 50 more effective and inconspicuous. As a result, the light emitting device 20 can produce a calm atmosphere while emphasizing the expanse of the space, and can give an atmosphere such as a high-class feeling to the space S.

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 the formula (A), the formula (B), the formula (A') or the formula (B') is satisfied, the existence of the surface light source device 50 can be made less noticeable more effectively. As a result, the light emitting device 20 can produce a calm atmosphere while emphasizing the expanse of the space, and can give an atmosphere such as a high-class feeling to the space S.

Further, by appropriately selecting the light emitting body 52 of the light source 51 used in the surface light source device 50, it is possible to give a tint to the light emitting color of the light emitting device 20. When the light source 51 includes a plurality of types of light emitters 52 that emit light in different wavelength ranges, it is possible to change the emission color depending on which light emitter 52 is turned on. For example, the emission color of the light emitting device 20 may be changed according to the temperature of the space S and the season. Further, the emission color of the light emitting device 20 may be changed according to the purpose of use of the space S, for example, the content to be discussed in the space S. Further, instead of controlling the emission color or in addition to controlling the emission color, the emission amount may be controlled. The control of the amount of light emission can be realized by adjusting the type and quantity of the light emitting body 52 used for light emission. According to such a light emitting device 20, it is possible to appeal to the sensibilities of 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 one 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. It has a decorative sheet 40 and. In the 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. In such a light emitting device 20, it is possible to make it difficult to grasp that the decorative sheet 40 is artificially illuminated. In addition, only the light emitting region Z1 of the decorative sheet 40 emits light in a planar manner. According to such a light emitting device 20, the presence of the surface light source device 50 can be effectively diminished, whereby the atmosphere of the space S can be effectively produced. Specifically, it is possible to effectively emphasize the expanse of space while producing a calm atmosphere. As a result, according to the light emitting device 20, it is possible to give a feeling of luxury and comfort to the space S, and it is possible to add value to the space S.

As a result of diligent studies by the inventors of the present invention, it has been confirmed that it is effective to limit the area ratio 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 can erase the presence and blend into the surrounding environment, and can produce an effect without causing a sense of discomfort. In particular, when the region ratio occupied by the light emitting region Z1 is equal to or less than a certain value in combination with the above-mentioned formula (A), formula (B), formula (A') or formula (B'), the effect of the light emitting device 20 is produced. Became more prominent.

Specifically, the region occupied by the light emitting region Z1 of the light emitting device 20 is preferably 15% or less, more preferably 10% or less, and further preferably 8% or less of the other regions. I understood. Here, the other area is, for example, the area of the entire wall when the light emitting device 20 is installed on the wall w. 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%. The following is more preferable. Further, 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 above-mentioned specific example, 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 the light emitting device 20, the brightness in the light emitting region Z1 can be made different between the region close to the non-light emitting region Z2 and the region separated from the non-light emitting region Z2. As a result, the presence of the surface light source device 50 can be diminished more effectively.

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

Further, in the above-mentioned specific example, the amount of emitted light from an arbitrarily selected position of the light emitting surface 50a is emitted from another position of the light emitting surface 50a located on one side s1 in the uniaxial direction d1 from the position. It is less than the amount of light. According to the light emitting device 20, the brightness in the light emitting region Z1 can be gradually darkened 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 diminished. In addition, the expanse of space can be emphasized more effectively.

Further, in the above-mentioned specific example, the surface light source device 50 has a light guide plate 60 including an extraction element 61 that changes the traveling direction of light traveling inside the surface light source device 50, and one of the surface light source devices 50 in the uniaxial direction d1 along the sheet surface of the decorative sheet 40. It has a light source 51 facing the light guide plate 60 from the side s1 of the light source. The non-light emitting region Z1 is adjacent to the light emitting region Z2 from the other side s2 which is opposite to one side s1 in the uniaxial direction d1. According to the 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 diminished. In addition, the expanse of space can be emphasized more effectively.

Further, in the above-mentioned specific example, the light guide plate 60 has a reflecting portion 69 having a visible light reflecting function or an absorbing portion 68 having visible light absorption in an end region on the other side s2 in the uniaxial direction d1. Includes. According to such a light guide plate 60, it is possible to effectively prevent light leakage from the opposite surface 60d facing the light entrance surface 60c of the light guide plate 60. 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 being locally brightened. This makes it possible to more effectively dilute the presence of the surface light source device 50. Further, when the reflecting unit 69 is used, it is possible to effectively improve the utilization efficiency of the light emitted from the light source 51.

Further, in the above-mentioned 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 cosmetic 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 relationship of the following formula (A).
1 ≦ (X × T + 300 × R) / (300 × R) <1.1 ・ ・ ・ (A)
More precisely, 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 peripheral portion of the light emitting region Z1 facing the peripheral portion 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 peripheral edge of the light emitting region Z _1, and the non-light emitting region Z 2 adjacent to the peripheral edge of the light emitting region Z1. visible light reflectance of the decorative sheet 40 in the peripheral portion R _{2 [%]} and, it is preferable to satisfy the following formula (B) relationship.
1 ≦ (X × T ₁ +300 × R ₁ ) / (300 × R ₂ ) <1.1
... (B)
According to the 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 diminished. In addition, the expanse of space can be emphasized more effectively.

Further, in the above-mentioned specific example, the light emitting device 20 further has a board 30 arranged so as to face at least the non-light emitting region Z2. By using the board 30, the components 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 diminished.

Further, in the above-mentioned specific example, the light emitting surface 50a of the surface light source device 50 is located on the same virtual surface as the surface 30a facing the non-light emitting region Z2 of the board 30. Therefore, 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 diminished.

Further, in the above-mentioned specific example, the board 30 is arranged facing both the non-light emitting region Z2 and the light emitting region Z1. The board 30 is provided with a recess 31 for accommodating the surface light source device 50 at a position facing the light emitting region Z1. By using the board 30, the components 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 diminished.

It is possible to make various changes to the specific examples described above. Hereinafter, an example of modification will be described with reference to the drawings. In the following description and the drawings used in the following description, the same codes as those used for the corresponding parts in the above-mentioned specific examples are used for the parts that can be configured in the same manner as the above-mentioned specific examples, and are duplicated. The explanation is omitted.

In the specific example described above, an example is shown in which the surface light source device 50 is an edge light type having a light guide plate 60 and a light source 51 arranged on the side of the light guide plate 60, but the present invention is not limited to this. For example, the direct type surface light source device 50 may be incorporated in the light emitting device 20. The 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 an optical member 55. The optical sheet 58 is arranged between the light diffusing sheet 56 and the reflective 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. As an example, the optical sheet 58 has a function of adjusting the illuminance distribution due to the arrangement of the plurality of light emitters 52, for example, a function of homogenizing. In the example shown in FIG. 12, the optical sheet 58 is composed of a prism sheet having a prism protruding toward the light diffusion sheet 56. In the surface light source device 50 of FIG. 12, the light diffusion sheet 56 forms a 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.

The surface light source device 50 shown in FIG. 12 can also realize the emission light amount distribution along the first direction d1 in the above-mentioned light emitting region Z1. For example, the luminous flux ([lm]) of one light emitting body 52 is emitted by another light emitting body 52 located on the first side s1 in the first direction d1 from the one light emitting body 52. By lowering 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 the light emitting device 20, the brightness in the light emitting region Z1 can be made darker in the region near the non-light emitting region Z2 than in the region separated from the non-light emitting region Z2. As a result, the presence of the surface light source device 50 can be effectively diminished.

Further, the luminous flux ([lm]) of one arbitrarily selected illuminant 52 of the other illuminant 52 located on the first side s1 in the first direction d1 with respect to the one illuminant 52. By setting the luminous flux to be equal to or less than the luminous flux ([lm]), 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 the light emitting device 20, the brightness in the light emitting region Z1 can be gradually darkened 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 diminished.

Further, 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 planar 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 above-mentioned specific example, in order to make the presence of the surface light source device 50 inconspicuous, 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 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 may change along the first direction d1.

For example, the visible light transmittance of the decorative sheet 40 at a certain position is higher 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 value, 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 the light emitting device 20, the brightness in the light emitting region Z1 can be made darker in the region near the non-light emitting region Z2 than in the region separated from the non-light emitting region Z2. As a result, the presence of the surface light source device 50 can be effectively diminished.

Further, the visible light transmittance of the decorative sheet 40 at an arbitrarily selected position is equal to or less 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. Therefore, it is possible to reduce the amount of light emitted from the decorative sheet 40 as it approaches the non-light emitting region Z2 located on the second side s2 in the first direction d1. According to the light emitting device 20, the brightness in the light emitting region Z1 can be gradually darkened 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 diminished.

As another modification, the overall configuration of the light emitting device 20 can be appropriately changed. The modifications described below can also have the same effects as the above-mentioned specific examples.

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

Further, the structure 2 may be provided with a portion for accommodating the light emitting device 20. In the example shown in FIGS. 14 and 15, the light emitting device 20 is the same as the light emitting device shown in FIG. However, in the examples shown in FIGS. 14 and 15, a recess ca is formed in the ceiling c and accommodates an end region located on the first side s1 of the light emitting device 20. By providing the concave portion 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 located in the recess ca. As a result, the light emitting region 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. Further, in the illustrated example, the end portion of the first side s1 in the first direction d1 of the light guide plate 60 is located on the first side s1 in the first direction d1 with respect to the surface of the ceiling c, and is located in the first direction. The wall w can be brightly illuminated from the end of the first side s1 in d1, and the effect of the effect can be further enhanced.

Further, as shown in FIG. 16, the board 30 does not need to support the surface light source device 50 from the back surface side. In the example shown in FIG. 16, the board 30 faces only the non-light emitting region Z2 of the decorative sheet 40, and does not face the light emitting region 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 body wa by the support 33. As the support 33, a support frame, support bolts, or the like can be used. In the example shown in FIG. 16, the support 33 may also be included in the building material panel 3 or the assembly kit 4.

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

Further, in the above-mentioned specific example, 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 has a board 30, a surface light source device 50 supported by the board 30, and a pair of decorative sheets 40 laminated on the main surfaces on both sides of the board 30. There is. A part of the first decorative sheet 40A of the pair of decorative sheets 40 is illuminated by the surface light source device 50. On the other hand, the second decorative sheet 40B 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 in the entire area thereof in the same manner as a 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. 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 be single. The surface light source device 50 may emit light on both sides to illuminate both the first decorative sheet 40A and the second decorative sheet 40B. As an example, the double-sided light emitting type surface light source device 50 can be obtained by providing a light diffusion sheet 56 in place of the reflection sheet 57 of the surface light source device 50 shown in FIG.

Further, in the above-mentioned specific example, 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 as shown in FIG. 20, the light guide plate 60 may face both the light emitting region Z1 and the non-light emitting region Z2 of the decorative sheet 40. As described above, the light traveling in the light guide plate 60 can be emitted from the light guide plate 60 by the extraction element 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 region of the light guide plate 60 facing the decorative sheet 40 side is the region facing the light emitting region Z1. The region facing the non-light emitting region Z2 does not function as the light emitting surface 60a from which light is emitted. Therefore, in FIG. 20, the same action and effect as those of the above-mentioned specific example can be obtained.

Further, as another modification, as shown in FIG. 21, the decorative sheet 40 may be arranged so as 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 side surfaces 50c located between the pair of main surfaces 50b. One main surface 50b includes a light emitting surface 50a. In the illustrated example, the decorative sheet 40 faces one main surface 50a including the light emitting surface 50a and the side surface 50c adjacent to the 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 the 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. Further, a panel material 70 including a board 30 and a decorative sheet 40 covering one main surface and a 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 regions of various sizes and shapes by combining with the panel material 70 whose shape and size are adjusted.

Note that FIG. 22 shows an exploded perspective view of the light emitting device 20 of FIG. 21. In the example shown in FIG. 22, the light emitting device 20 comes to have 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 each of the four side surfaces 50c of the surface light source device 50. The portion of the region 40a of the decorative sheet 40 facing the light emitting surface 50a forms the light emitting region Z1, and the portion of the region 40a of the decorative sheet 40 not facing the light emitting surface 50a and the region of the decorative sheet 40. 40b and 40b form a non-light emitting region Z2.

The surface light source device 50 includes a reflection sheet 57, a light guide plate 60, an adjustment sheet 59, and a light diffusion sheet 56. A light emitting body 52 is provided facing the light guide plate 60 from the first side s1 in the first direction d1. The adjusting sheet 59 includes a transparent base material 59a having visible light transmission and a light absorbing portion 59b provided on the base material 59a. The light absorption unit 59b contains, for example, a pigment having visible light absorption, and has a visible light absorption function. As an example, the light absorption unit 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. Then, the light absorption capacity in each region of the adjustment sheet 59 is not uniform and changes. For example, the light absorption capacity of the adjustment sheet 59 in a certain region of the adjustment sheet 59 in another region located on the first side s1 in the first direction d1 from the region and close to the light emitter 52. By making it stronger than the light absorption capacity, it is possible to reduce the amount of emitted light from the region located on the second side s2 in the first direction d1 and close to the non-light emitting region Z2. Further, the light absorption capacity of the adjustment sheet 59 in an arbitrarily selected region is set to be equal to or higher than the light absorption capacity of the adjustment sheet 59 in another region 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. According to these adjustment sheets 59, the brightness in the light emitting region Z1 can be made darker in the region near the non-light emitting region Z2 than in the region separated from the non-light emitting region Z2. As a result, the presence of the surface light source device 50 can be effectively diminished.

The visible light absorption capacity can be adjusted by adjusting the content density of the pigment, the arrangement density of the light absorption unit 59b, the thickness of the light absorption unit 59b, and the like.

As a modification related to FIGS. 21 and 22, the light emitting device 20 in the modification shown in FIGS. 23 and 24 supports the surface light source device 50 in addition to the decorative sheet 40 and the surface light source device 50. It has a frame 34. The support frame 34 reinforces the surface light source device 50 and facilitates the installation of the surface light source device 50 on the outside such as the wall w. The decorative sheet 40 may be directly bonded to the surface light source device 50, or may be bonded 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 a region not covered by the support frame 34 of the surface light source device 50 in the light emitting region Z1. Further, the decorative sheet 40 faces the support frame 34 that covers the surface light source device 50 in the non-light emitting region Z2. In the example shown in FIG. 24, the non-light emitting region Z2 of the decorative sheet 40 extends to a region facing the side surface of the surface light source device 50 via the support frame 34. Further, 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 can be made of a metal plate such as aluminum, for example. The support plate 35 can be applied not only to the examples shown in FIGS. 23 and 24 but also to other examples, but can be omitted from the examples of FIGS. 23 and 24.

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

Further, the light emitting device 20 described above has been described as constituting the wall w as the building material panel 3, but the present invention is not limited to this, and the ceiling c may be configured, or the floor f may be configured. You may try to do it.

As described above, the decorative sheet 40 and the surface light source device 50 may be treated as an assembly kit 4. That is, at least a part of the optical member 55 of the surface light source device 50 and the combination of the decorative sheet 40 may be distributed or sold as the assembly kit 4 and installed in the building 1 or the moving body. In this example, the decorative sheet 40 and the surface light source device 50 constituting the assembly kit 4 may be installed in the building 1 or the moving body in order to produce the structure 2, or the assembly kit 4 may be first installed. The light emitting device 20 and the building material panel 3 are assembled using the constituent decorative sheet 40 and the surface light source device 50, and then the assembled light emitting device 20 and the building material panel 3 are installed in the building 1 or the moving body to prepare the structure 2. You may try to do it.

Although specific examples and modified examples for one embodiment have been described above, it is naturally possible to apply a plurality of examples in combination as appropriate.

1 Building 2 Structure 2a Decorative surface 3 Building material panel 4 Assembly kit 10 Lighting system 15 Lighting equipment 20 Light source 21 Auxiliary building material 22 Fastener 30 Board 30a Surface 31 Recess 33 Support 34 Support frame 35 Support plate 40 Decorative sheet 40A 1st Decorative sheet 40B Second decorative sheet 40a Area 40b Area 50 Surface light source device 50a Light emitting surface 50b Main surface 50c Side surface 51 Light source 52 Light emitting body 55 Optical member 56 Light diffusion sheet 57 Reflective sheet 58 Optical sheet 59 Adjustment sheet 59a Base material 59b Light absorption unit 60 Light source plate 60a Light source surface 60b Back surface 60c Light input surface 60d Opposite surface 61 Extraction element 65 Light source plate body 65a Concavo-convex surface 65b Recessed 66 Light scattering layer 66a Support layer 66b Light scattering element 67 Light scattering element 68 Absorbing unit 69 Reflection Part 70 Panel material d1 First direction s1 First side s2 Second side c Ceiling ca Recess w Wall w Wall body f Floor S Space Z1 Light source area Z2 Non-light source area

Claims (1)

A surface light source device having a light emitting surface and
A light emitting device comprising 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.

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