JP7324432B2 - Lighting devices and lighting systems - Google Patents

Description

The present disclosure relates to lighting devices and lighting systems.

BACKGROUND ART Conventionally, techniques for creating a space by emitting light into the space have been proposed. For example, in Patent Document 1, an indirect lighting device installed on a wall surface called a peripheral unit is used to emit light from a light source that is hidden and cannot be directly viewed by reflection on a reflective panel or ceiling. By projecting it indirectly into the space, the space is produced so as to emphasize the height of the ceiling and the breadth of the walls.

In the technique disclosed in Patent Document 1, a plurality of indirect lighting devices are installed adjacent to each other on the upper part of the wall surface of a room.

JP 2011-210594 A

However, the technique disclosed in Patent Literature 1 is not effective in effectively producing the atmosphere of the space by harmonizing the appearance of the boundary between adjacent indirect lighting devices and the appearance of the surroundings of the boundary. The reality was that no proposals were made.

The present disclosure has been made in consideration of the above points, and aims to provide a lighting device and a lighting system that can effectively produce the atmosphere of a space.

A lighting device according to the present disclosure includes:
a surface light source device having a light emitting surface, a first side surface located on the outer edge side of the light emitting surface, and a second side surface connected to the first side surface;
holding the surface light source device, only the first side of the first side and the second side, or part of the second side and the first side of the first side and the second side a holding portion covering only the side surface;
a first decorative sheet covering at least part of the light emitting surface;
and a second decorative sheet that covers at least part of the second side surface.

In a lighting device according to the present disclosure,
The second side surface has a pair of horizontally opposed surfaces,
The first side surface may have a pair of surfaces facing each other in a direction non-parallel to the horizontal direction.

In a lighting device according to the present disclosure,
At least one optical layer between the second decorative sheet and the second side surface covered with the second decorative sheet for suppressing transmission of light from the second side surface toward the second decorative sheet may be provided.

In a lighting device according to the present disclosure,
A reflective layer is provided between the second decorative sheet and the second side surface covered with the second decorative sheet for reflecting light directed toward the second decorative sheet from the second side surface. good too.

In a lighting device according to the present disclosure,
A light shielding layer is provided between the second decorative sheet and the second side surface covered with the second decorative sheet for blocking light from the second side surface toward the second decorative sheet. good too.

In a lighting device according to the present disclosure,
A dimming layer is provided between the second decorative sheet and the second side surface covered with the second decorative sheet for reducing light directed toward the second decorative sheet from the second side surface. may be

In a lighting device according to the present disclosure,
The light emitting surface has a gradual change in the amount of emitted light along one axial direction,
The light attenuation layer may have a transmittance that gradually changes along the uniaxial direction.

In a lighting device according to the present disclosure,
Between the second decorative sheet and the reflective layer, there is provided a light blocking layer for blocking light directed toward the second decorative sheet from the second side surface, or blocking light directed toward the second decorative sheet from the second side surface. An attenuating layer for attenuating light may be provided.

In a lighting device according to the present disclosure,
A diffusion layer may be provided between the second decorative sheet and the dimming layer to diffuse light traveling from the second side surface toward the second decorative sheet.

In a lighting device according to the present disclosure,
The reflective layer may be a third decorative sheet.

In a lighting device according to the present disclosure,
The second decorative sheet may be provided integrally with the first decorative sheet.

In a lighting device according to the present disclosure,
The surface light source device is
a light guide plate at least partially defining the second side;
and a light source positioned between the holding portion and the first side surface.

A lighting system according to the present disclosure includes:
comprising at least one lighting device;
The lighting device
a surface light source device having a light emitting surface and first and second side surfaces located on the outer edge side of the light emitting surface;
holding the surface light source device, only the first side of the first side and the second side, or part of the second side and the first side of the first side and the second side a holding part covering only the side surface;
a first decorative sheet covering at least part of the light emitting surface;
and a second decorative sheet that covers at least part of the second side surface.

In a lighting system according to the present disclosure,
comprising a plurality of the lighting devices,
The plurality of lighting devices may be arranged along an orthogonal direction perpendicular to the uniaxial direction.

In a lighting system according to the present disclosure,
The plurality of lighting devices may be arranged with a gap in the orthogonal direction.

In a lighting system according to the present disclosure,
A fourth decorative sheet positioned in the gap along the uniaxial direction may be further provided.

In a lighting system according to the present disclosure,
a plurality of boards positioned in the uniaxial direction with respect to each surface light source device of the plurality of lighting devices;
A plurality of fifth decorative sheets positioned in the uniaxial direction with respect to the first decorative sheet of each of the plurality of lighting devices and covering each of the plurality of boards may be further provided.

In a lighting system according to the present disclosure,
The plurality of boards and the fifth decorative sheet may be arranged along the orthogonal direction with a second gap continuing to the gap in the uniaxial direction.

In a lighting system according to the present disclosure,
The fourth decorative sheet may also be positioned in the second gap.

A lighting device according to the present disclosure includes:
a surface light source device having a light emitting surface, a first side surface located on an outer edge side of the light emitting surface, and a second side surface adjacent to the first side surface;
A holding portion configured not to face at least a partial region of the first side surface and not to face at least a partial region of the second side surface, the holding portion holding the surface light source device. and,
a first decorative sheet facing at least part of the light emitting surface;
and a second decorative sheet facing at least a portion of the second side surface.

According to the present disclosure, it is possible to effectively produce the atmosphere of the space.

FIG. 1 is a perspective view showing a lighting system according to this embodiment. FIG. 2 is a perspective view showing an example of a lighting device included in the lighting system according to this embodiment. FIG. 3 is a front view showing an example of a lighting device included in the lighting system according to this embodiment. FIG. 4A is a cross-sectional view showing an example of a lighting device included in the lighting system according to this embodiment. FIG. 4B is a cross-sectional view showing an example of a lighting device different from that in FIG. 4A. FIG. 5 is a vertical cross-sectional view showing an example of a lighting device included in the lighting system according to this embodiment. FIG. 6 is a longitudinal sectional view showing an example of a surface light source device included in the illumination system according to this embodiment. FIG. 7 is a perspective view showing a lighting system according to a first modified example of this embodiment. FIG. 8 is a longitudinal sectional view showing an example of a lighting device included in a lighting system according to a first modified example of this embodiment. FIG. 9 is a cross-sectional view showing an example of a lighting device included in a lighting system according to a second modified example of this embodiment. FIG. 10 is a cross-sectional view showing another example of the lighting device included in the lighting system according to the second modified example of this embodiment. FIG. 11 is a cross-sectional view showing an example of a lighting device included in a lighting system according to a third modified example of this embodiment. FIG. 12 is a cross-sectional view showing an example of a lighting device included in a lighting system according to a fourth modified example of this embodiment. FIG. 13 is an exploded perspective view showing an example of a lighting device included in a lighting system according to a fifth modified example of this embodiment. FIG. 14 is a cross-sectional view showing an example of a lighting device included in a lighting system according to a fifth modified example of this embodiment. FIG. 15 is a cross-sectional view showing an example of a lighting device included in a lighting system according to a sixth modified example of this embodiment. FIG. 16 is a perspective view showing a lighting system according to a seventh modified example of this embodiment. FIG. 17 is a longitudinal sectional view showing an example of a lighting device included in a lighting system according to a seventh modified example of this embodiment. FIG. 18 is a longitudinal sectional view showing an example of a lighting device included in a lighting system according to an eighth modified example of this embodiment. FIG. 19 is a longitudinal sectional view showing an example of a lighting device included in a lighting system according to a ninth modified example of this embodiment. FIG. 20 is a longitudinal sectional view showing an example of a lighting device included in a lighting system according to a tenth modified example of this embodiment. FIG. 10 is a diagram showing an example of application of the lighting system to a partition; FIG. 22 is a diagram showing an application example of the lighting system to a partition different from that in FIG. 21;

A lighting system and a lighting device according to the present embodiment will be described below with reference to the drawings. In addition, in the drawings attached to this specification, for the convenience of illustration and ease of understanding, the scale and the ratio of vertical and horizontal dimensions are appropriately changed and exaggerated from those of the real thing.

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

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

Also, as used herein, directional terms such as "up", "down", "left", "right", "vertical", "horizontal", etc. refer to relative positions of parts or portions of the lighting system. It is just an example of expressions used to describe the configuration of the lighting system, such as the relationship, the traveling direction of light, or the light amount distribution realized by the lighting system, and the description of the configuration of the lighting system equivalent to the present disclosure uses other expressions. are within the scope of this disclosure.

In addition, in the drawings referred to in this embodiment and its modifications, the same parts or parts having similar functions are denoted by the same reference numerals or similar reference numerals, and repeated description thereof will be omitted.

(Lighting system 1)
1 to 20 are diagrams showing multiple examples of this embodiment. Among them, FIG. 1 is a perspective view showing an illumination system 1 according to this embodiment. Moreover, FIG. 2 is a perspective view which shows an example of the illuminating device 20 contained in the illuminating system 1 by this embodiment. FIG. 3 is a front view showing an example of the lighting device 20 included in the lighting system 1 according to this embodiment. FIG. 4A is a cross-sectional view showing an example of the lighting device 20 included in the lighting system 1 according to this embodiment, ie, a cross-sectional view taken along line IV-IV in FIG. FIG. 4B is a cross-sectional view showing an example of lighting device 20 different from that in FIG. 4A. FIG. 5 is a longitudinal sectional view showing an example of the lighting device 20 included in the lighting system 1 according to this embodiment. FIG. 6 is a longitudinal sectional view showing an example of the surface light source device 21 included in the illumination system 1 according to this embodiment.

The lighting system 1 according to this embodiment is a system that produces a space by emitting light into the space. In other words, the lighting system 1 is a system for forming the atmosphere of a space by emitting light into the space so as to create a desired psychological state for users of the space.

Specifically, the lighting system 1 according to this embodiment can be used to illuminate and produce a space S in a room partitioned by structures such as walls W, ceiling CE, and floor F. A lighting system can also be called a space production system, and can also be called a structure, a building material, or an interior material. A base lighting device 3 that irradiates the space S with illumination light is provided on the ceiling CE. A room in which the lighting system 1 is applied is, for example, a room in a building.
The lighting system 1 may be applied to rooms other than buildings, such as cabins and passenger compartments. Also, the lighting system 1 may be applied to structures other than rooms.

In the example of FIG. 1, the lighting system 1 includes a plurality of lighting devices 20 arranged along a wall W, and a longitudinal joint decorative sheet 62 that is an example of a fourth decorative sheet. The plurality of lighting devices 20 are arranged side by side along a horizontal direction d2, which is an example of an orthogonal direction perpendicular to the uniaxial direction, with a vertical joint jd2, which is an example of a gap, provided. The vertical joint decorative sheet 62 is provided at the vertical joint jd2 so as to cover the vertical joint jd2. Although two lighting devices 20 are arranged side by side on the front wall W in FIG. 1, three or more lighting devices 20 may actually be arranged side by side.

The illumination device 20 includes a surface light source device 21, a surface light source decorative sheet 61 arranged on the surface light source device 21, and an upper frame 71 and a lower frame 71 shown in FIG. and a frame 72 . The lighting device 20 can also be called a building material panel. The lighting device 20 may function as an inner wall material of the room while being superimposed on the wall W. Also, all or part of the constituent elements of the lighting device 20 may be handled as an assembly kit for manufacturing the lighting device 20 and distributed or sold.

As shown in FIG. 1, the surface light source device 21 is hidden from the space S by the surface light source decorative sheet 61 so that the user of the space S cannot directly see it. By emitting light from the surface light source device 21 hidden by the surface light source decorative sheet 61 into the space S through the surface light source decorative sheet 61, the light emitted while weakening the presence of the surface light source device 21 is emitted from the surface light source decorative sheet. Together with the colors, patterns, textures, etc. of 61, the atmosphere of the space S can be effectively produced.

(Surface light source device 21, upper frame 71, lower frame 72)
The surface light source device 21, the upper frame 71, and the lower frame 72 will be described in detail below. As shown in FIGS. 5 and 6, the surface light source device 21 has a light emitting surface 21a that emits planar light. The surface light source device 21 is positioned such that the light emitting surface 21 a faces the surface light source decorative sheet 61 . More specifically, the light emitting surface 21a faces a light emitting surface decorative sheet portion 61a of the surface light source decorative sheet 61, which will be described later. In the examples of FIGS. 5 and 6, the light emitting surface 21a is formed over a wide range in the vertical direction d1 so that its upper end reaches the vicinity of the ceiling CE and its lower end reaches the vicinity of the floor F. The arrangement is not limited to that shown in FIG. 5, and an arrangement in which the surface light source device 21 is formed on a portion of the wall W in the vertical direction d1 may be employed.

The surface light source device 21 shown in FIGS. 5 and 6 is an edge light type surface light source device 21 . This surface light source device 21 has a light emitter 210 which is an example of a light source, a light guide plate 211 , a light diffusion sheet 212 and a reflection sheet 213 . As will be described later, the light diffusion sheet 212 forms the light emitting surface 21a of the surface light source device 21. As shown in FIG. The surface light source device 21 may be configured by combining, for example, a surface light source device using a direct type LED, a surface light source device using an EL (Electro Luminescence) sheet, or the like, and an edge light type surface light source device. .

Light emitter 210 emits light. A specific aspect of the light emitter 210 is not particularly limited, and various members that emit light can be widely used. Specifically, for example, a cold cathode tube, a point-like full-color light emitting diode (LED), an incandescent light bulb, a laser oscillation device, or the like can be used as the light emitter 210 . In the example shown in FIGS. 3 and 5, light emitter 210 is held by upper frame 71 . A plurality of light emitters 210 are arranged at intervals along the horizontal direction d2 shown in FIG. When the upper frame 71 is detachable, the plurality of light emitters 210 can be removed together with the upper frame 71 from the surface light source device 21 to replace some or all of the plurality of light emitters 210 . The upper frame 71 is a member that holds the light emitter 210 and holds the surface light source device 21 so as to cover the upper side surface 21d of the light guide plate 211, which will be described later. The upper frame 71 may cover only the upper side surface 21d, or may cover a part of the left side surface 21b or the right side surface 21c of the light guide plate 211, which will be described later, along with the upper side surface 21d. The lower frame 72 is a member that holds the surface light source device 21 so as to cover the lower side surface 21e of the light guide plate 211, which will be described later. The lower frame 72 may cover only the lower side surface 21e, or may cover a portion of the left side surface 21b or the right side surface 21c together with the lower side surface 21e. Note that the illumination device 20 may include only the upper frame 71 and not include the lower frame 72 .

As shown in FIG. 6, the light guide plate 211 is a plate-like member having a pair of main surfaces 211a and 211b and side surfaces located between the pair of main surfaces 211a and 211b. One main surface forms the light output surface 211a, and the other main surface forms the back surface 211b. The main surfaces 211a and 211b are typically rectangular in plan view. The main surfaces 211a and 211b have a pair of side edges extending along the vertical direction d1, which is an example of one axial direction, and a pair of side edges extending along the horizontal direction d2 perpendicular to the vertical direction d1. .

As shown in FIGS. 4A to 6, the light guide plate 211 is an example of the first side surface of the surface light source device 21 located on the outer edge side of the light emitting surface 21a, and is a pair of light guide plates facing in the direction d1 not parallel to the horizontal direction d2. It has an upper side surface 21d and a lower side surface 21e, which are also examples of surfaces of . The light guide plate 211 is an example of a second side surface of the surface light source device 21 located on the outer edge side of the light emitting surface 21a, and is an example of a pair of surfaces facing in the horizontal direction d2. have. That is, the light guide plate 211 constitutes the second side surface of the surface light source device 21 .

The upper side surface 21 d is a side surface that is located at the end of the light guide plate 211 above d11 in the vertical direction d1 and is covered by the upper frame 71 . The lower side surface 21e is located at the end of the light guide plate 211 downward d12 in the vertical direction d1 and is a side surface covered with the lower frame 72 . The left side surface 21b is positioned at the left end d21 in the horizontal direction d2 of the light guide plate 211, and is a side surface covered with a left side decorative sheet portion 61b described later. The right side surface 21c is positioned at the right end d22 in the horizontal direction d2 of the light guide plate 211, and is a side surface covered with a right side decorative sheet portion 61c, which will be described later. That is, the upper side surface 21d and the lower side surface 21e, and the left side surface 21b and the right side surface 21c are arranged so as to intersect and connect with each other.

While the upper side surface 21d and the lower side surface 21e are covered with the upper frame 71 and the lower frame 72, the left side surface 21b and the right side surface 21c are exposed without being covered with the frames. In other words, the upper frame 71 and the lower frame 72 are configured so as to face at least a portion of the upper side surface 21d and the lower side surface 21e and not to face at least a portion of the left side surface 21b and the right side surface 21c. ing. According to such a configuration, it is possible to prevent the formation of wide non-light-emitting regions like frames on the left and right sides of the light-emitting surface decorative sheet portion 61a due to the existence of the frames on the left and right side surfaces 21b and 21c. Furthermore, when a plurality of light emitting devices 21 are arranged in the horizontal direction (for example, horizontal direction d2 in the figure), it is difficult to perceive the seams between the adjacent light emitting devices. In addition, as will be described later, by covering the left side surface 21b and the right side surface 21c with the side surface decorative sheet portions 61b and 61c in a state where the left side surface 21b and the right side surface 21c are intentionally exposed, the light from the left and right side surfaces 21b and 21c to the vertical joint jd2 side can be Emission can be reduced.

The light emitter 210 is positioned between the upper frame 71 and the upper side surface 21 d of the light guide plate 211 . Thereby, the upper side surface 21 d functions as a light incident surface for light emitted from the light emitter 210 . More specifically, the upper side surface 21d extends in the horizontal direction d2 along the upper frame 71. As shown in FIG. The upper side surface 21 d faces the light emitter 210 held by the upper frame 71 .

As shown in FIG. 6, the light emitted from the light emitter 210 enters the light guide plate 211 from the upper side surface 21d and travels through the light guide plate 211. As shown in FIG. A main surface 211b of the light guide plate 211 is provided with a concave portion 211c functioning as an extraction element. The concave portion 211c changes the traveling directions of the lights L1 and L2 traveling through the light guide plate 211 . Lights L1 and L2 incident on the light guide plate 211 travel through the light guide plate 211 by reflection, especially total reflection. The lights L1 and L2 traveling through the light guide plate 211 are caused to change their traveling directions by the concave portions 211c, particularly by being scattered, so that they are incident on the pair of main surfaces 211a and 211b of the light guide plate 211 at an angle of incidence less than the critical angle for total reflection. , and exits from the light guide plate 211 . That is, the lights L1 and L2 whose traveling directions are changed by the concave portion 211c are emitted from the light guide plate 211 via one of the pair of main surfaces 211a and 211b.

As shown in FIGS. 5 and 6, the light diffusion sheet 212 is provided to face the main surface 211a of the light guide plate 211. As shown in FIGS. Lights L<b>1 and L<b>2 emitted from the main surface 211 a of the light guide plate 211 enter the light diffusion sheet 212 . The light diffusing sheet 212 has a light diffusing function, and can adjust the luminance angular distribution caused by the transmitted light. The light diffusion sheet 212 forms the light emitting surface 21 a of the surface light source device 21 . The light diffused by the light diffusion sheet 212 is emitted from the light emitting surface 21 a toward the surface light source decorative sheet 61 . The light diffusion sheet 212 can employ various configurations capable of exhibiting a light diffusion function. The diffusion characteristics of the light diffusion sheet 212 may be isotropic or anisotropic.

As shown in FIGS. 5 and 6, the reflective sheet 213 is provided facing the rear surface 211b of the light guide plate 211. As shown in FIGS. The reflective sheet 213 can reflect the light emitted from the back surface 211 b and direct it toward the light guide plate 211 and the light diffusion sheet 212 . By providing the reflection sheet 213, the amount of light emitted from the light emitting surface 21a of the surface light source device 21 can be increased. Thereby, the utilization efficiency of the light emitted from the light emitter 210 can be improved. Various configurations capable of exhibiting a light reflecting function can be employed for the reflective sheet 213 . The reflection characteristic of the reflection sheet 213 may be specular reflection or diffuse reflection. The diffuse reflection characteristics of the reflective sheet 213 may be isotropic or anisotropic.

(Decorative sheets 61, 62)
The decorative sheets 61 and 62 will be described in detail below. The surface light source decorative sheet 61 is provided in the lighting device 20 and is a translucent member that forms the light emitting region Z1 of the lighting system 1 as a decorative surface exposed to the space S. The surface light source decorative sheet 61 is fixed to the surface light source device 21 via, for example, a bonding layer containing an adhesive or an adhesive.

The vertical joint decorative sheet 62 is a member provided at the vertical joint jd2 so as to be adjacent to the surface light source decorative sheet 61 in the horizontal direction d2. In the example of FIG. 4A, the vertical joint decorative sheet 62 has, as a decorative surface exposed to the space S, a light emitting area Z2 illuminated by the light L2 emitted from the left and right side surfaces 21b and 21c of the light guide plate 211, that is, a reflected illumination area. Form. The vertical joint decorative sheet 62 is fixed to the vertical joint jd2 via a bonding layer containing, for example, an adhesive or an adhesive.

A paper-based decorative sheet, a resin-based decorative sheet, or the like can be used as the surface light source decorative sheet 61 and the vertical joint decorative sheet 62 . In order to harmonize the appearance in the horizontal direction d2, it is desirable that the surface light source decorative sheet 61 and the vertical joint decorative sheet 62 have uniform appearances such as color, pattern and texture.

As shown in FIGS. 1 to 3, the surface light source decorative sheet 61 includes a light emitting surface decorative sheet portion 61a as an example of a first decorative sheet and a left side decorative sheet portion 61b as an example of a second decorative sheet. , a right side decorative sheet portion 61c, which is an example of a second decorative sheet, an upper side decorative sheet portion 61d, and a lower side decorative sheet portion 61e.

In the illustrated example, each of the sheet portions 61a to 61e is an integral structure formed by one sheet, for example. In this case, one sheet may have a single-layer structure or a multi-layer structure. By integrating the sheet portions 61a to 61e, the number of parts and costs can be reduced, and the easiness of assembly of the lighting system 1 can be improved. Each of the sheet portions 61a to 61e may be configured as separate bodies formed of different sheets. By configuring each of the sheet portions 61a to 61e as separate bodies, for example, between the light emitting surface decorative sheet portion 61a and the left and right side surface decorative sheet portions 61b and 61c, appearance such as color and pattern, and visible light transmission Since it is possible to vary the optical characteristics such as the index, the degree of freedom in design can be improved.

The light-emitting surface decorative sheet portion 61a is provided facing the light-emitting surface 21a so as to cover at least a portion of the light-emitting surface 21a, and is the portion of the surface light source decorative sheet 61 that forms the outermost surface on the light output side of the illumination system 1. . The light-emitting surface decorative sheet portion 61a may cover the entire light-emitting surface 21a, or may cover the light-emitting surface 21a except for specific portions such as holes intentionally formed in the surface light source device 21. good. The light-emitting surface decorative sheet portion 61a may be in contact with the light-emitting surface 21a, or may be spaced forward from the light-emitting surface 21a.

The light-emitting surface decorative sheet portion 61a is irradiated with light from the rear surface side by the surface light source device 21 . The light-emitting surface decorative sheet portion 61a has visible light transmittance. Therefore, light emitted from the light emitting surface 21a of the surface light source device 21 can pass through the light emitting surface decorative sheet portion 61a, that is, the light emitting region Z1. Since the light-emitting surface decorative sheet portion 61a is illuminated with transmitted light in this manner, a white wallpaper having a relatively high transmittance is preferably used as the light-emitting surface decorative sheet portion 61a.
However, even wallpaper with a relatively low transmittance, such as wood grain wallpaper, can be transmitted and illuminated sufficiently effectively.
The pattern and the like of the light-emitting surface decorative sheet portion 61a are not particularly limited. The visible light transmittance of the light-emitting surface decorative sheet portion 61a is preferably 1.0% or more, more preferably 10% or more. The visible light transmittance is measured using an infrared-visible-ultraviolet spectrophotometer (UV3100PC manufactured by Shimadzu Corporation) in a wavelength range of 380 nm or more and 780 nm or less according to JIS A5759-2008, and is defined in the same standard. It is calculated by the calculation formula.

The left side decorative sheet portion 61b is located on the left end side of the light emitting surface decorative sheet portion 61a, and is a constituent portion of the surface light source decorative sheet 61 provided so as to cover at least a portion of the left side 21b of the light guide plate 211. . In the example of FIGS. 2 and 4A, the left side decorative sheet portion 61b continues to the left end of the light emitting surface decorative sheet portion 61a and covers the entire left side 21b. The left side decorative sheet portion 61b may be in contact with the left side 21b of the light guide plate 211, or may be spaced leftward d21 from the left side 21b.

The right side decorative sheet portion 61c is located on the right end side of the light emitting surface decorative sheet portion 61a and is a constituent portion of the surface light source decorative sheet 61 provided so as to cover at least a portion of the right side 21c of the light guide plate 211. . In the example of FIGS. 2 and 4A, the right side decorative sheet portion 61c continues to the right end of the light emitting surface decorative sheet portion 61a and covers the entire right side 21c. The right side decorative sheet portion 61c may be in contact with the right side 21c of the light guide plate 211, or may be spaced rightward d22 from the right side 21c.

The upper surface decorative sheet portion 61 d is located on the upper end side of the light emitting surface decorative sheet portion 61 a and is a constituent portion of the surface light source decorative sheet 61 provided so as to cover the upper surface of the upper frame 71 . In the examples of FIGS. 2 and 5, the upper surface decorative sheet portion 61d is continuous with the upper end portion of the light emitting surface decorative sheet portion 61a. The upper surface decorative sheet portion 61d may be in contact with the upper surface of the upper frame 71, or may be separated from the upper surface of the upper frame 71 upward d11.

The lower surface decorative sheet portion 61e is located on the lower end side of the light emitting surface decorative sheet portion 61a and is a constituent portion of the surface light source decorative sheet 61 provided so as to cover the lower surface of the lower frame 72. As shown in FIG. The lower surface decorative sheet portion 61e may be in contact with the lower surface of the lower frame 72, or may be spaced downward d12 from the lower surface of the lower frame 72. As shown in FIG.

The appearance and optical characteristics of these upper, lower, left, and right side surface decorative sheet portions 61b to 61e are the same as those of the light emitting surface decorative sheet portion 61a. The appearance and optical characteristics of the side surface decorative sheet portions 61b to 61e may be different from those of the light emitting surface decorative sheet portion 61a.

Here, if frames are present on the left side 21b and the right side 21c, conspicuous wide non-light-emitting areas are formed like frames on the left and right sides of the light-emitting surface decorative sheet portion 61a. This non-light-emitting area makes it impossible to harmonize the appearance of the illumination system 1 in the horizontal direction d2, that is, the brightness, and may give the user of the space S a sense of discomfort. In order to prevent this uncomfortable feeling, the left side 21b and the right side 21c of the light guide plate 211 are not covered with the frame in this embodiment. Further, in order to produce a three-dimensional effect of the light-emitting surface decorative sheet portion 61a, in this embodiment, a vertical joint jd2 recessed from the light-emitting surface decorative sheet portion 61a is provided between the adjacent lighting devices 20. As shown in FIG.

In such a configuration, as shown in FIGS. 3 and 4A, of the light emitted from the light emitter 210, a part of the light L spreading to the left d21 spreads from the left side 21b of the light guide plate 211 to the left d21. to Further, part of the light L that spreads to the right d22 out of the light emitted from the light emitter 210 is emitted from the right side surface 21c of the light guide plate 211 to the right d22.

Since the left side surface 21b of the light guide plate 211 is not covered with a frame, if the left side decorative sheet portion 61b is not provided, the vertical joint jd2 on the left side of the lighting device 20, that is, the vertical joint decorative sheet 62 is irradiated from the left side surface 21b. The vertical joint jd2 becomes too bright due to the excessive amount of light applied. Also, since the right side surface 21c of the light guide plate 211 is not covered with the frame, if the right side decorative sheet portion 61c is not provided, the vertical joint jd2 on the right side of the lighting device 20 from the right side surface 21c, that is, the vertical joint decorative sheet 62 The vertical joint jd2 becomes too bright due to the excessive amount of light irradiated to the vertical joint jd2. Light is emitted from the device, making it too bright. 3 and 4A, the vertical joint jd2 and the vertical joint decorative sheet 62 are provided on both the left and right sides of the lighting device 20. A longitudinal joint decorative sheet 62 may be provided.

As described above, when the left side decorative sheet portion 61b and the right side decorative sheet portion 61c are not provided, the light emitting region Z2 of the vertical joint jd2 becomes too bright with respect to the light emitting region Z1 of the lighting device 20. It becomes impossible to balance the brightness in the horizontal direction d2. The inability to balance the brightness in the horizontal direction d2 of the lighting system 1 may cause the user of the space S to feel uncomfortable.

On the other hand, in this embodiment, the left side decorative sheet portion 61b is provided, so that the left side decorative sheet portion of the light emitted from the left side 21b of the light guide plate 211 A portion of light LL corresponding to the reflectance of 61b can be reflected by left side decorative sheet portion 61b. This makes it possible to reduce the amount of light L2L, which is emitted from the left side surface 21b and illuminates the vertical joint jd2 on the left side of the lighting device 20. FIG. It should be noted that the light that makes the vertical joint jd2 on the left side of the lighting device 20 look bright includes not only the light that is applied to the vertical joint decorative sheet 62 on the left side of the lighting device 20, but also the light that is not applied to the vertical joint decorative sheet 62. Although some light may be emitted forward from the left side surface 21b, the left side decorative sheet portion 61b can reduce the amount of such light.

In addition, in the present embodiment, since the right side decorative sheet portion 61c is provided, as shown in FIG. A part of the light LR corresponding to the ratio can be reflected by the right side decorative sheet portion 61c. This makes it possible to reduce the amount of the light L2R, which is emitted from the right side surface 21c and illuminates the vertical joint jd2 on the right side of the lighting device 20. FIG. The light that makes the vertical joint jd2 on the right side of the lighting device 20 look bright includes not only the light that is applied to the vertical joint decorative sheet 62 on the right side of the lighting device 20, but also the light that is not applied to the vertical joint decorative sheet 62. However, the right side decorative sheet portion 61c can reduce the amount of such light.

In this way, by reducing the amount of light applied to the vertical joint jd2 by the left side decorative sheet portion 61b and the right side decorative sheet portion 61c, the light emission region of the vertical joint jd2 is reduced relative to the light emission region Z1 of the lighting device 20. Z2 can be prevented from becoming too bright. As a result, the brightness of the lighting system 1 in the horizontal direction d2 can be harmonized, so that the user of the space S can be prevented from feeling uncomfortable.

Furthermore, in the present embodiment, as shown in FIG. 4A, of the light reflected by the left side decorative sheet portion 61b, a part of the light L1L that includes the component in the traveling direction in front of the light diffusion sheet 212 is The light can be incident on the left edge of the light diffusion sheet 212 . The light L1L incident on the left edge of the light diffusion sheet 212 can be diffused by the light diffusion sheet 212 and emitted from the left edge of the light emitting surface decorative sheet portion 61a. Further, as shown in FIG. 4A , of the light reflected by the right side decorative sheet portion 61 c , a portion of the light L1R that includes the component in the forward traveling direction is caused to enter the right edge portion of the light diffusion sheet 212 . can be done. The light L1R incident on the right edge of the light diffusion sheet 212 can be diffused by the light diffusion sheet 212 and emitted from the right edge of the light emitting surface decorative sheet portion 61a.

In this manner, the lights L1L and L1R reflected by the left and right side surface decorative sheet portions 61b and 61c are emitted from the left and right edges of the light emitting surface decorative sheet portion 61a, thereby increasing the light emission compared to the central portion of the light emitting region Z1. Darkening of the left and right edges of the region Z1 can be suppressed. As a result, the brightness in the horizontal direction d2 of the lighting system 1 can be more effectively harmonized, so that the user of the space S can be more effectively prevented from feeling uncomfortable.

Furthermore, in the present embodiment, since the vertical joint decorative sheet 62 is provided at the vertical joint jd2, by matching the color, pattern, texture, etc. of the vertical joint decorative sheet 62 with the surface light source decorative sheet 61, the light emitter 210 can be The external appearance of the lighting system 1 in the horizontal direction d2 can be harmonized not only when the lighting is on but also when the light emitter 210 is off. As a result, it is possible to more effectively prevent the user of the space S from feeling uncomfortable.

(Base lighting device 3)
Next, the base lighting device 3 will be described. As shown in FIGS. 1 and 5, the base lighting device 3 is attached to the ceiling CE and emits illumination light Lx into the space S from above. The base lighting device 3 may be fixed to the ceiling CE or suspended from the ceiling CE. The base lighting device 3 assists in grasping the inside of the space S through human vision. Therefore, as the base lighting device 3, a general indoor lighting fixture can be used.
Although the illumination light Lx emitted from the base illumination device 3 is not particularly limited, natural illumination can be achieved by using white. The base lighting device 3 may emit illumination light with higher luminance than the lighting device 20, for example. In other words, the illumination device 20 may emit illumination light with a luminance lower than that of the base illumination device 3 . According to such a configuration, it is possible to more effectively prevent the user of the space S from feeling uncomfortable.

The effects brought about by this embodiment will be described below.

As described above, the illumination device 20 includes the surface light source device 21 having the light emitting surface 21a, the surface light source decorative sheet 61 covering the light emitting surface 21a, and the side surface 21b of the surface light source device 21 positioned on the outer edge side of the light emitting surface 21a. to 21e, and frames 71 and 72 for holding upper and lower side surfaces 21d and 21e. Left and right side surface decorative sheet portions 61b are provided so as to cover the left and right side surfaces 21b and 21c.

According to such a configuration, as shown in FIG. 3, the light LL emitted from the left side surface 21b of the light guide plate 211 is reflected by the left side decorative sheet portion 61b. It is possible to reduce the light amount of the light L2L irradiated to the left vertical joint jd2 of the illumination device 20 of . Further, since the right side decorative sheet portion 61c is provided, the light LR emitted from the right side surface 21c of the light guide plate 211 is reflected by the right side decorative sheet portion 61c, as shown in FIG. It is possible to reduce the amount of light L2R, which is emitted from the light LR emitted from the light 21c and is irradiated to the vertical joint jd2 on the right side of the lighting device 20. FIG.

As a result, it is possible to prevent the vertical joint jd2 from becoming too bright and to harmonize the brightness in the horizontal direction d2 of the lighting system 1, thereby preventing the user of the space S from feeling uncomfortable. can.

Furthermore, as shown in FIG. 4A, part of the light L1L reflected by the left side decorative sheet portion 61b can be made incident on the left edge of the light diffusion sheet 212 and emitted from the left edge of the light emitting region Z1. Also, part of the light L1R reflected by the right side decorative sheet portion 61c can be made incident on the right edge of the light diffusion sheet 212 and emitted from the right edge of the light emitting region Z1.

As a result, darkening of the left and right edges of the light-emitting surface decorative sheet portion 61a compared to the central portion of the light-emitting surface decorative sheet portion 61a is suppressed, and the brightness of the lighting system 1 in the horizontal direction d2 is more effectively increased. can be harmonized, it is possible to more effectively prevent the user of the space S from feeling uncomfortable.

That is, according to the lighting system 1 of the present embodiment, the appearance of the vertical joint jd2 that is the boundary between the adjacent lighting devices 20 and the appearance of the lighting device 20 that is around the boundary are harmonized to create a space. atmosphere can be effectively produced.

Furthermore, since it is possible to make it difficult to specify the position of the light emitter 210 from the left and right sides of the lighting device 20 when the light emitter 210 is turned on, it is possible to create the illusion of light emerging from the light emitting region Z1 without knowing the position of the light source. Since the atmosphere can be produced, it is possible to create a comfortable psychological state for the user of the space S.

Further, as described above, the left side decorative sheet portion 61b and the right side decorative sheet portion 61c are provided integrally with the surface light source decorative sheet 61. As shown in FIG.

With such a configuration, the number of parts can be reduced, and the ease of assembly of the lighting device 20 can be improved.

As described above, the surface light source device 21 includes a light guide plate 211 provided with upper and lower side surfaces 21d and 21e and left and right side surfaces 21b and 21c so as to cross each other, an upper frame 71 and an upper side surface 21d. and a light emitter 210 positioned between.

As a result, the atmosphere of the space can be effectively produced in the edge-light type illumination device 20 in which the light emitter 210 is held by the upper frame 71 .

As shown in FIG. 4B, the vertical joint decorative sheet 62 may be arranged on the wall W side of the lighting device 20, that is, on the rear side opposite to the light emitting surface 21a. According to the example of FIG. 4B, for example, the lighting device 20 can be installed after the vertical joint decorative sheet 62 is pasted on the wall W, so that the ease of pasting the vertical joint decorative sheet 62 can be improved. can.

(First modification)
FIG. 7 is a perspective view showing a lighting system 1 according to a first modified example of this embodiment. FIG. 8 is a longitudinal sectional view showing an example of an illumination device 20 included in the illumination system 1 according to the first modified example of this embodiment.

So far, an example of the lighting system 1 in which the lighting device 20 is provided over substantially the entire area of the wall W from the top end to the bottom end of the wall W has been described. On the other hand, in the lighting system 1 according to the first modification, with the intention of making the surface light source device 21 more inconspicuous, a partial area of the upper end side of the wall W is provided along the horizontal direction d2. A plurality of lighting devices 20 are provided.

In addition, the lighting system 1 according to the first modification fills in the step between the lighting device 20 and the wall W, and the appearance of the region on the wall W where the lighting device 20 is provided and the region on the wall W other than that is A plurality of boards 5 and a plurality of board decorative sheets 64, which are an example of a fifth decorative sheet, are provided with the intention of harmonizing .

The plurality of boards 5 are positioned below d12 with respect to the respective surface light source devices 21 of the plurality of lighting devices 20 . The plurality of board decorative sheets 64 are positioned below d12 with respect to the surface light source decorative sheets 61 of the plurality of lighting devices 20 and cover the plurality of boards 5, respectively.

A plurality of boards 5 and board decorative sheets 64 are arranged along the horizontal direction d2 with a vertical joint jd2, which is an example of a second gap, left. The vertical joint jd2 of the board 5 is continuous with the vertical joint jd2 of the lighting device 20 in the vertical direction d1. The vertical joint decorative sheet 62 is also provided at the vertical joint jd2 of the board 5 . That is, the vertical joint decorative sheet 62 extends from the upper end of the vertical joint jd2 of the lighting device 20 to the lower end of the vertical joint jd2 of the board 5 .

The board 5 is a plate-like member. As the board 5, for example, wooden board materials such as veneer, plywood, laminated wood, particle board, fibrous board, cement-based materials such as concrete and mortar, gypsum board, inorganic non-metallic board made of calcium silicate, iron, aluminum, etc. It is possible to use a metal plate, a resin plate material, or the like. The board 5 preferably has flame resistance and fire resistance.

The board decorative sheet 64 is a member provided on the board 5 and serving as a decorative surface exposed to the space S to form the non-light emitting area Z3. The board decorative sheet 64 covers the surface 5 a of the board 5 and the upper, lower, left and right side surfaces 5 b of the board 5 . That is, in the example shown in FIG. 8, the shape of the board decorative sheet 64 is the same as the shape of the surface light source decorative sheet 61 shown in FIG.

The decorative board sheet 64 is provided with the intention of harmonizing the appearance of the light-emitting region Z1 and the non-light-emitting region Z3, that is, harmonizing the appearance of the illumination system 1 in the vertical direction d1 when the light emitter 210 is turned off. . Therefore, it is desirable that the board decorative sheet 64 and the surface light source decorative sheet 61 have the same appearance such as color, pattern and texture.

Also, the non-light-emitting region Z3 by the board decorative sheet 64 may be positioned on the same plane as the light-emitting region Z1 by the surface light source decorative sheet 61 . This makes it difficult for a step to be formed between the non-light-emitting region Z3 and the light-emitting region Z1, thereby effectively suppressing deterioration in designability caused by the visibility of the step.

Also, the amount of light emitted from a certain position on the light emitting surface 21a may be less than the amount of light emitted from another position on the light emitting surface 21a located above the position d11 in the vertical direction d1. In this case, the amount of light emitted from the light emitting surface 21a may decrease continuously toward the downward direction d12. Such a distribution of the amount of emitted light can be obtained, for example, by controlling the distribution in the vertical direction d1 of the concave portion 211c functioning as an extraction element described in FIG. can be achieved by adjusting Further, in the edge light type surface light source device 21, the amount of light emitted from the light exit surface 211a tends to decrease gradually from the upper surface 21d of the light guide plate 211, which is the light entrance surface, toward the lower surface 21e. Therefore, in such an edge light type surface light source device 21, even if the light scattering power caused by the concave portion 211c is uniform along the vertical direction d1, the amount of emitted light from a certain position on the light emitting surface 21a is can be made smaller than the amount of light emitted from other positions located above d11. By doing so, the atmosphere of the space S can be effectively enhanced. In particular, by reducing the light emission amount at the edge of the lower d12 in the vertical direction d1 of the light emitting surface 21a, the seam of light between the light emitting region Z1 and the non-light emitting region Z3 outside the light emitting region Z1 is made inconspicuous. be able to. This makes it possible to produce the atmosphere of the space S more effectively.

Further, by changing the amount of light emitted from the light emitting area Z1 of the surface light source decorative sheet 61 along the vertical direction d1, the surface light source device 21 can be made inconspicuous. Therefore, at least one of the amount of light emitted from the light emitting surface 21a and the transmittance of the surface light source decorative sheet 61 may be changed along the vertical direction d1. For example, the visible light transmittance of the surface light source decorative sheet 61 at a certain position is made lower than the visible light transmittance of the surface light source decorative sheet 61 at another certain position located below the position d12. , the amount of light emitted from the surface light source decorative sheet 61 can be reduced at a position close to the non-light-emitting area Z3 of the board 5 located at the lower side d12. According to this illumination device 20, the brightness in the light-emitting region Z1 can be made darker in the region adjacent to the non-light-emitting region Z3 than in the region away from the non-light-emitting region Z3. As a result, the presence of the surface light source device 21 can be effectively reduced.

Further, the visible light transmittance of the surface light source decorative sheet 61 at an arbitrarily selected position is set to be equal to or lower than the visible light transmittance of the surface light source decorative sheet 61 at other positions positioned d11 above the position. Therefore, it is possible to reduce the amount of light emitted from the surface light source decorative sheet 61 as it approaches the non-light emitting area Z3 of the board 5 positioned at the lower side d12. According to this illumination device 20, the brightness in the light-emitting region Z1 can be gradually made darker as it approaches the non-light-emitting region Z3. As a result, the boundary between the light-emitting region Z1 and the non-light-emitting region Z3 can be effectively made inconspicuous, and the presence of the surface light source device 21 can be more effectively reduced.

As described above, according to the first modification, the surface light source device 21 can be made less conspicuous, and the appearance of the lighting device 20 can be harmonized by the board 5 and the board decorative sheet 64. Therefore, the atmosphere of the space S can be produced more effectively. Further, according to the first modification, the joint of light between the light-emitting region Z1 by the lighting device 20 and the non-light-emitting region Z3 by the board 5 can be made inconspicuous, so that the atmosphere of the space S can be improved more effectively. can be directed to

(Second modification)
FIG. 9 is a cross-sectional view showing an example of a lighting device 20 included in the lighting system 1 according to the second modified example of this embodiment.

So far, an example of the illumination system 1 in which no optical layer exists between the left and right side surfaces 21b, 21c of the light guide plate 211 and the left and right side surface decorative sheet portions 61b, 61c has been described.

On the other hand, the lighting system 1 according to the second modification, as shown in FIG. A left side reflection sheet 221, which is an example of a reflection layer, is provided as an optical layer that suppresses transmission of light. In addition, as shown in FIG. 9, the lighting system 1 according to the second modified example has a light transmission system between the right side decorative sheet portion 61c and the right side surface 21c, which transmits light from the right side surface 21c toward the right side decorative sheet portion 61c. A right side reflection sheet 222, which is an example of a reflection layer, is provided as an optical layer that suppresses the .

The left side reflection sheet 221 is a layer that reflects light traveling from the left side 21b of the light guide plate 211 toward the left side decorative sheet portion 61b. Left side reflection sheet 221 may overlap left side 21b and left side decorative sheet portion 61b in horizontal direction d2 while being in contact with at least one of left side 21b and left side decorative sheet portion 61b of light guide plate 211 . Alternatively, the left side reflection sheet 221 may overlap the left side 21b and the left side decorative sheet portion 61b in the horizontal direction d2 while being separated from at least one of the left side 21b and the left side decorative sheet portion 61b of the light guide plate 211. good.

The right side reflection sheet 222 is a layer that reflects light traveling from the right side 21c of the light guide plate 211 toward the right side decorative sheet portion 61c. Right side reflection sheet 222 may overlap right side 21c and right side decorative sheet portion 61c in horizontal direction d2 while being in contact with at least one of right side 21c and right side decorative sheet portion 61c of light guide plate 211 . Alternatively, the right side reflection sheet 222 may overlap the right side 21c and the right side decorative sheet portion 61c in the horizontal direction d2 while being separated from at least one of the right side 21c and the right side decorative sheet portion 61c of the light guide plate 211. good.

The left and right side reflection sheets 221 and 222 are made of, for example, a material having a reflectance higher than that of the left and right side decorative sheet portions 61b and 61c. For example, by using titanium oxide as the material for the left and right side reflection sheets 221 and 222, the reflectance of the side reflection sheets 221 and 222 can be made higher than the reflectance of the left and right side decorative sheet portions 61b and 61c. In addition, the left and right side reflection sheets 221 and 222 are made of the same decorative sheet as the left and right side surface decorative sheet portions 61b and 61c, which are an example of the third decorative sheet, so that the reflectance of the side reflection sheets 221 and 222 is can be made the same as the reflectance of the left and right side decorative sheet portions 61b and 61c.

When the left and right side reflection sheets 221 and 222 are made of decorative sheets, as shown in FIG. may be continuous. In the example of FIG. 10 , strip-shaped side surface decorative sheet portions 61 b and 61 c are provided on the left and right sides of the surface light source decorative sheet 61 .

The left and right side reflection sheets 221 and 222 may be configured separately from the light guide plate 211, or may be integrally formed with the light guide plate 211 on the left and right side surfaces 21b and 21c. Alternatively, the left and right side reflection sheets 221 and 222 may be configured integrally with the reflection sheet 213 on the back surface of the light guide plate 211 .

In the example of FIG. 9, part of the light emitted from the light emitter 210 that spreads to the left d21 is emitted from the left side 21b of the light guide plate 211 to the left d21, and then incident on Of the light incident on the left side reflection sheet 221, part of the light L3L corresponding to the reflectance of the left side reflection sheet 221 is reflected by the left side reflection sheet 221, and the other part of the light is left side reflection. It is absorbed by the sheet 221 or transmitted through the left side reflection sheet 221 . Part of the light L1L transmitted through the left side reflection sheet 221 may be reflected by the left side decorative sheet portion 61b. Part of the light emitted from the light emitter 210 that spreads to the right d22 enters the right side reflection sheet 222 after being emitted from the right side 21c of the light guide plate 211 to the right d22. Of the light incident on the right side reflection sheet 222, a portion of the light L3R corresponding to the reflectance of the right side reflection sheet 222 is reflected by the right side reflection sheet 222, and the other portion of the light is reflected by the right side reflection sheet. It is absorbed by the sheet 222 or transmitted through the right side reflection sheet 222 . Part of the light L1R transmitted through the right side reflection sheet 222 may be reflected by the right side decorative sheet portion 61c.

In this way, by reflecting light with the left side reflection sheet 221, the light amount of the light L2L irradiated to the left vertical joint jd2 of the lighting device 20 can be reduced compared to the case where only the left side decorative sheet portion 61b is provided. can be reduced more effectively. In addition, by reflecting the light with the right side reflection sheet 222, the light amount of the light L2R applied to the right vertical joint jd2 of the lighting device 20 can be effectively reduced compared to the case where only the right side decorative sheet portion 61c is provided. can be effectively reduced.

Therefore, according to the example of FIG. 9, by effectively reducing the amount of light irradiated to the vertical joint jd2 by the left side reflection sheet 221 and the right side reflection sheet 222, the light emission region Z1 of the lighting device 20 can be On the other hand, it is possible to more effectively prevent the light emitting region Z2 of the vertical joint jd2 from becoming too bright. As a result, the brightness in the horizontal direction d2 of the lighting system 1 can be more effectively harmonized, so that the user of the space S can be more effectively prevented from feeling uncomfortable.

Further, in the example of FIG. 9, of the light reflected by the left side reflection sheet 221, a portion of the light L3L, which includes the component of the traveling direction toward the front, is made incident on the left edge of the light diffusion sheet 212, It can be emitted from the left edge of the light emitting region Z1. Note that the reflected light L1L from the left side decorative sheet portion 61b may also enter the left edge portion of the light diffusion sheet 212 . Further, in the example of FIG. 9, of the light reflected by the right side reflection sheet 222, a part of the light L3R, which includes the component in the traveling direction toward the front, is made incident on the right edge of the light diffusion sheet 212, It can be emitted from the right edge of the light emitting region Z1. Note that the reflected light L1R from the right side decorative sheet portion 61c may also enter the right edge portion of the light diffusion sheet 212 .

Therefore, according to the example of FIG. 9, the lights L3L and L3R reflected by the left and right side reflection sheets 221 and 222 with high reflectance are made incident on the left and right edges of the light diffusion sheet 212, thereby By emitting light from the edges, compared with the case where only the left and right side decorative sheet portions 61b and 61c are provided, it is more effective to make the left and right edges of the light emitting region Z1 darker than the central portion of the light emitting region Z1. can be suppressed to As a result, the brightness in the horizontal direction d2 of the lighting system 1 can be more effectively harmonized, so that the user of the space S can be more effectively prevented from feeling uncomfortable.

As described above, according to the second modification, by more effectively balancing the brightness in the horizontal direction d2 of the lighting system 1, it is possible to more effectively give the user of the space S a sense of discomfort. can be prevented. Thereby, the atmosphere of the space S can be produced more effectively.

(Third modification)
FIG. 11 is a cross-sectional view showing an example of a lighting device 20 included in a lighting system 1 according to a third modified example of this embodiment.

So far, examples of lighting systems 1 that harmonize the appearance mainly in the horizontal direction d2 have been described.

On the other hand, the lighting system 1 according to the third modified example has a structure suitable for harmonizing the appearance in the vertical direction d1 in the structure including the board 5 described in the first modified example.

Specifically, as shown in FIG. 11, the illumination system 1 according to the third modification further includes a left side decorative sheet portion 61b and a left side reflection sheet in addition to the configurations of the first and second modifications. 221, a left side light shielding sheet 231, which is an example of a light shielding layer, is provided as an optical layer for suppressing transmission of light from the left side 21b toward the left side decorative sheet portion 61b. In addition, the lighting system 1 according to the third modification further suppresses transmission of light from the right side surface 21c toward the right side decorative sheet portion 61c between the right side decorative sheet portion 61c and the right side reflection sheet 222. As an optical layer, a right side light shielding sheet 232, which is an example of a light shielding layer, is provided.

The left side light shielding sheet 231 is a layer that blocks light from the left side 21b of the light guide plate 211 toward the left side decorative sheet portion 61b. More specifically, the left side light shielding sheet 231 is a layer that uniformly shields light traveling from the left side 21b of the light guide plate 211 toward the left side decorative sheet portion 61b with a uniform light absorption rate. The left side light shielding sheet 231 may overlap the left side reflection sheet 221 and the left side decorative sheet portion 61b in the horizontal direction d2 while being in contact with at least one of the left side reflection sheet 221 and the left side decorative sheet portion 61b. Alternatively, the left side light-shielding sheet 231 overlaps the left side reflection sheet 221 and the left side decorative sheet portion 61b in the horizontal direction d2 while being separated from at least one of the left side reflection sheet 221 and the left side decorative sheet portion 61b. good too.

The right side light shielding sheet 232 is a layer that blocks light from the right side 21c of the light guide plate 211 toward the right side decorative sheet portion 61c. More specifically, the right side light shielding sheet 232 is a layer that uniformly shields light traveling from the right side 21c of the light guide plate 211 toward the right side decorative sheet portion 61c with a uniform light absorption rate. The right side light shielding sheet 232 may overlap the right side reflection sheet 222 and the right side decorative sheet portion 61c in the horizontal direction d2 while being in contact with at least one of the right side reflection sheet 222 and the right side decorative sheet portion 61c. Alternatively, the right side light shielding sheet 232 may overlap the right side reflection sheet 222 and the right side decorative sheet portion 61c in the horizontal direction d2 while being spaced apart from at least one of the right side reflection sheet 222 and the right side decorative sheet portion 61c. good.

The left and right side light shielding sheets 231 and 232 are made of a material having a higher light absorption rate than the surface light source decorative sheet 61 and the side reflection sheets 221 and 222 . For example, the left and right side light-shielding sheets 231 and 232 may have a transparent sheet such as an OHP sheet, and a light absorbing layer such as black ink disposed entirely on the surface of the transparent sheet by printing or the like. .

In the example of FIG. 11, part of the light emitted from the light emitter 210 that spreads to the left d21 is emitted from the left side 21b of the light guide plate 211 to the left d21, and then incident on Of the light incident on the left side reflection sheet 221, part of the light L3L corresponding to the reflectance of the left side reflection sheet 221 is reflected by the left side reflection sheet 221, and the other part of the light is left side reflection. It is absorbed by the sheet 221 or transmitted through the left side reflection sheet 221 . The light transmitted through the left side reflection sheet 221 enters the left side light shielding sheet 231 . Of the light incident on the left side light shielding sheet 231, most of the light L4L corresponding to the light absorptivity of the left side light shielding sheet 231 is absorbed or blocked by the left side light shielding sheet 231. FIG. After passing through the left side light shielding sheet 231, there may be light L1L reflected by the left side decorative sheet portion 61b. Part of the light emitted from the light emitter 210 that spreads to the right side d22 enters the right side reflection sheet 222 after being emitted from the right side 21c of the light guide plate 211 to the right side d22. Of the light incident on the right side reflection sheet 222, a portion of the light L3R corresponding to the reflectance of the right side reflection sheet 222 is reflected by the right side reflection sheet 222, and the other portion of the light is reflected by the right side reflection sheet. It is absorbed by the sheet 222 or transmitted through the right side reflection sheet 222 . The light transmitted through the right side reflection sheet 222 enters the right side light shielding sheet 232 .
Of the light incident on the right side light shielding sheet 232 , most of the light L4R corresponding to the light absorption rate of the right side light shielding sheet 232 is absorbed by the right side light shielding sheet 232 . After passing through the right side light shielding sheet 232, there may be light L1R reflected by the right side decorative sheet portion 61c.

By shielding the light with the left side light shielding sheet 231 in this way, it is possible to prevent the light from being applied to the left vertical joint jd2 of the lighting device 20 . Further, by shielding light with the right side light shielding sheet 232, it is possible to prevent light from being applied to the vertical joint jd2 on the right side of the lighting device 20. FIG.

By preventing the vertical joint jd2 from being irradiated with light, the surface of the vertical joint decorative sheet 62 can function as the non-light emitting area Z4.

Here, since the board 5 does not emit light, the surface of the vertical joint decorative sheet 62 provided at the vertical joint jd2 of the board 5 shown in FIG. 7 functions as a non-light-emitting area.

In addition to the configuration of FIG. 7, in the example of FIG. 11, the surface of the vertical joint decorative sheet 62 provided at the vertical joint jd2 of the lighting device 20 also functions as the non-light emitting area Z4.

That is, according to the example of FIG. 11, the entire surface of the vertical joint decorative sheet 62 from the upper end to the lower end can function as a non-light emitting area.

Therefore, according to the third modification, by darkening the entire range of the vertical joint decorative sheet 62, the appearance of the lighting system 1 in the vertical direction d1 can be harmonized. That is, according to the third modification, the appearance of the vertical joint jd2 of the lighting device 20, which is the boundary of the lighting device 20, and the vertical joint jd2 of the board 5, which is the periphery of the boundary of the lighting device 20, are harmonized. By doing so, the atmosphere of the space can be effectively produced.

(Fourth modification)
FIG. 12 is a cross-sectional view showing an example of a lighting device 20 included in a lighting system 1 according to a fourth modified example of this embodiment.

As shown in FIG. 12, the illumination system 1 according to the fourth modification has a configuration in which the left and right side reflection sheets 221 and 222 are removed from the configuration of the third modification. In the example of FIG. 12, the left side light shielding sheet 231 may be in contact with the left side 21b or may be separated from the left side 21b. Also, the right side light shielding sheet 232 may be in contact with the right side 21c or may be separated from the right side 21c.

According to the example of FIG. 12, light is not reflected by the left and right side reflection sheets 221 and 222 as in the third modification. Most of the lights L4L and L4R are blocked by the left and right side light blocking sheets 231 and 232. FIG.

Therefore, according to the fourth modification, the non-light-emitting region Z4 of the vertical joint decorative sheet 62 can be further darkened, so that the external appearance of the lighting system 1 in the vertical direction d1 can be harmonized more effectively. .

(Fifth Modification)
FIG. 13 is an exploded perspective view showing an example of a lighting device 20 included in the lighting system 1 according to the fifth modified example of this embodiment. FIG. 14 is a cross-sectional view showing an example of a lighting device 20 included in a lighting system 1 according to a fifth modified example of this embodiment.

The illumination system 1 according to the fifth modification includes an adjustment sheet 24 between the light guide plate 211 and the light diffusion sheet 212 that adjusts the amount of light directed from the light guide plate 211 toward the surface light source decorative sheet 61 .

The adjustment sheet 24 has a front adjustment sheet portion 241, a left side adjustment sheet portion 242 that is an example of a light attenuation layer, and a right side adjustment sheet portion 243 that is an example of a light attenuation layer.

The front adjustment sheet portion 241 is arranged to face the light output surface 211a, which is the front surface of the light guide plate 211, and is positioned close to the non-light-emitting area Z3 by the board 5 positioned downward d12 in the vertical direction d1, and the light-emitting surface decorative sheet. It is a layer that reduces the amount of light emitted from the light emitting region Z1 by the portion 61a.

In the example of FIG. 13, the front adjustment sheet portion 241 includes a transparent substrate 24a having visible light transmittance, and a light absorbing portion 24b provided on the substrate 24a. The light absorbing portion 24b contains, for example, a visible light absorbing pigment, and has a visible light absorbing function. As an example, the light absorbing portion 24b contains carbon black or titanium black.

For example, the light absorption capacity of a certain region of the front adjustment sheet portion 241 is compared with the light absorption capacity of the front adjustment sheet portion 241 in another certain region located above the region d11 and close to the light emitter 210. , it is possible to reduce the amount of light emitted from the area located at the lower side d12 and close to the non-light-emitting area Z3 by the board 5 . Furthermore, by making the light absorption capacity of the front adjustment sheet portion 241 in an arbitrarily selected region equal to or higher than the light absorption capacity of the front adjustment sheet portion 241 in other regions located above the region d11, It is possible to continuously reduce the amount of emitted light as it approaches the non-light-emitting region Z3 located at the lower side d12. With such a configuration of the front adjustment sheet portion 241, the transmittance of the light emitting surface 21a may change continuously along the vertical direction d1. According to the front adjustment sheet portion 241, the brightness in the light-emitting region Z1 can be made darker in the region adjacent to the non-light-emitting region Z3 than in the region away from the non-light-emitting region Z3. As a result, the joint of light between the light-emitting area Z1 of the light-emitting surface decorative sheet portion 61a and the non-light-emitting area Z3 of the board 5 is made inconspicuous, and the presence of the surface light source device 21 can be effectively reduced.

The visible light absorbing ability can be adjusted by the content density of the pigment, the arrangement density of the light absorbing portions 24b, the thickness of the light absorbing portions 24b, and the like.

The left side adjustment sheet portion 242 is a layer that reduces light traveling from the left side 21b of the light guide plate 211 toward the left side decorative sheet portion 61b. That is, the left side adjustment sheet portion 242 is a layer that reduces the amount of light incident from the left side 21b side and emits the light to the left side decorative sheet portion 61b side. In the example shown in FIG. 13, the left side adjustment sheet portion 242 partially blocks the light incident from the left side 21b side, thereby reducing the total amount of light directed toward the left side decorative sheet portion 61b. It is the layer that lowers.

The left side adjustment sheet portion 242 may overlap the left side 21b and the left side decorative sheet portion 61b in the horizontal direction d2 while being in contact with at least one of the left side 21b and the left side decorative sheet portion 61b of the light guide plate 211. . Alternatively, the left side adjusting sheet portion 242 overlaps the left side surface 21b and the left side decorative sheet portion 61b in the horizontal direction d2 while being separated from at least one of the left side surface 21b and the left side decorative sheet portion 61b of the light guide plate 211. good too.

The right side adjustment sheet portion 243 is a layer that reduces light traveling from the right side 21c of the light guide plate 211 toward the right side decorative sheet portion 61c. That is, the right side adjustment sheet portion 243 is a layer that reduces the amount of light incident from the right side surface 21c side and emits it to the right side decorative sheet portion 61c side. In the example shown in FIG. 13, the right side adjustment sheet portion 243 partially blocks the light incident from the right side surface 21c side, thereby reducing the total amount of light directed toward the right side decorative sheet portion 61c. It is the layer that lowers.

The right side adjustment sheet portion 243 may overlap the right side surface 21c and the right side decorative sheet portion 61c in the horizontal direction d2 while being in contact with at least one of the right side surface 21c and the right side decorative sheet portion 61c of the light guide plate 211. . Alternatively, the right side adjustment sheet portion 243 overlaps the right side surface 21c and the right side decorative sheet portion 61c in the horizontal direction d2 while being separated from at least one of the right side surface 21c and the right side decorative sheet portion 61c of the light guide plate 211. good too.

The left and right side adjustment sheet portions 242 and 243, like the front adjustment sheet portion 241, have a base material 24a and a light absorbing portion 24b. Further, the transmittance of the left and right side adjustment sheet portions 242 and 243 may continuously change along the vertical direction d1. For example, the left and right side adjustment sheet portions 242 and 243 may have a light absorptance that continuously increases toward the bottom d12, so that the transmittance continuously decreases toward the bottom d12. As a result, the brightness distribution of the light-emitting region Z2 by the vertical joint decorative sheet 62 adjacent to the lighting device 20 can be aligned with the brightness distribution of the light-emitting region Z1 by the light-emitting surface decorative sheet portion 61a. Specifically, the brightness of the light emitting region Z2 by the vertical joint decorative sheet 62 can be made darker toward the downward direction d12.

In the example of FIG. 14, part of the light emitted from the light emitter 210 that spreads to the left d21 is emitted from the left side 21b of the light guide plate 211 to the left d21, and then 242. Of the light incident on the left side adjustment sheet portion 242, a portion of the light L5L corresponding to the light absorption rate of the left side adjustment sheet portion 242 is absorbed by the left side adjustment sheet portion 242, and the other portion of the light is absorbed by the left side adjustment sheet portion 242. , is reflected by the left side adjustment sheet portion 242 or passes through the left side adjustment sheet portion 242 . Part of the light L1L transmitted through the left side adjusting sheet portion 242 is reflected by the left side decorative sheet portion 61b, passes through the left edge of the light diffusion sheet 212, and travels forward from the left edge of the light emitting region Z1. may be ejected. Part of the light emitted from the light emitter 210 that spreads to the right side d22 is emitted to the right side 21c of the light guide plate 211 to the right side d22, and then enters the right side adjustment sheet portion 243. . Of the light incident on the right side adjustment sheet portion 243, a portion of the light L5R corresponding to the light absorption rate of the right side adjustment sheet portion 243 is absorbed by the right side adjustment sheet portion 243, and the other portion of the light is absorbed by the right side adjustment sheet portion 243. , is reflected by the right side adjustment sheet portion 243 or passes through the right side adjustment sheet portion 243 . Part of the light L1R transmitted through the right side adjustment sheet portion 243 is reflected by the right side decorative sheet portion 61c, passes through the right edge portion of the light diffusion sheet 212, and travels forward from the right edge portion of the light emitting region Z1. may be ejected.

In this way, by absorbing light with the left side adjusting sheet portion 242, the amount of light L2L irradiated to the left vertical joint jd2 of the lighting device 20 is reduced compared to the case where only the left side decorative sheet portion 61b is provided. can be reduced more effectively. In addition, by absorbing light with the right side adjusting sheet portion 243, the amount of the light L2R applied to the right vertical joint jd2 of the lighting device 20 can be increased as compared with the case where only the right side decorative sheet portion 61c is provided. can be effectively reduced.

Therefore, according to the example of FIG. 14, the light amount of the light irradiated to the vertical joint jd2 is effectively reduced by the left side adjustment sheet portion 242 and the right side adjustment sheet portion 243, so that the light emission area of the lighting device 20 is reduced. It is possible to more effectively prevent the light emitting region Z2 of the vertical joint jd2 from becoming too bright with respect to Z1. As a result, the brightness in the horizontal direction d2 of the lighting system 1 can be more effectively harmonized, so that the user of the space S can be more effectively prevented from feeling uncomfortable.

Furthermore, according to the example of FIG. 14 , by aligning the light absorptance distribution of the left and right side adjustment sheet portions 242 and 243 with the light absorptance distribution of the front adjustment sheet portion 241, the vertical joint adjacent to the lighting device 20 can be The brightness distribution of the light-emitting region Z2 by the decorative sheet 62 can be made uniform with the brightness distribution of the light-emitting region Z1 by the light-emitting surface decorative sheet portion 61a. As a result, the brightness in the horizontal direction d2 of the lighting system 1 can be more effectively harmonized, so that the user of the space S can be more effectively prevented from feeling uncomfortable.

As described above, according to the fifth modification, the brightness in the horizontal direction d2 of the illumination system 1 is reduced while making the joint of light between the light-emitting region Z1 and the non-light-emitting region Z3 outside the light-emitting region Z1 inconspicuous. It is possible to more effectively prevent the user of the space S from feeling uncomfortable by harmonizing the height. Thereby, the atmosphere of the space S can be produced more effectively.

(Sixth modification)
FIG. 15 is a cross-sectional view showing an example of a lighting device 20 included in the lighting system 1 according to the sixth modified example of this embodiment.

As shown in FIG. 15, the illumination system 1 according to the sixth modification has, in addition to the configuration of the fifth modification, a diffusion light between the left side adjustment sheet portion 242 and the left side decorative sheet portion 61b. A left side diffusion sheet 251, which is an example of a layer, is provided. The illumination system 1 according to the sixth modification further includes a right side diffusion sheet 252, which is an example of a diffusion layer, between the right side adjustment sheet portion 243 and the right side decorative sheet portion 61c.

The left side diffusion sheet 251 is a layer that diffuses light traveling from the left side 21b of the light guide plate 211 toward the left side decorative sheet portion 61b. Even if the left side diffusion sheet 251 overlaps the left side adjustment sheet portion 242 and the left side decorative sheet portion 61b in the horizontal direction d2 while being in contact with at least one of the left side adjustment sheet portion 242 and the left side decorative sheet portion 61b. good. Alternatively, the left side diffusion sheet 251 overlaps the left side adjustment sheet portion 242 and the left side decorative sheet portion 61b in the horizontal direction d2 while being separated from at least one of the left side adjustment sheet portion 242 and the left side decorative sheet portion 61b. may

The right side diffusion sheet 252 is a layer that diffuses light traveling from the right side 21c of the light guide plate 211 toward the right side decorative sheet portion 61c. Even if the right side diffusion sheet 252 overlaps the right side adjustment sheet portion 243 and the right side decorative sheet portion 61c in the horizontal direction d2 while being in contact with at least one of the right side adjustment sheet portion 243 and the right side decorative sheet portion 61c. good. Alternatively, the right side diffusion sheet 252 overlaps the right side adjustment sheet portion 243 and the right side decorative sheet portion 61c in the horizontal direction d2 while being separated from at least one of the right side adjustment sheet portion 243 and the right side decorative sheet portion 61c. may

The left side diffusion sheet 251 and the right side diffusion sheet 252 may be configured integrally with the light diffusion sheet 212 or may be configured separately.

In the example of FIG. 15, part of the light emitted from the light emitter 210 that spreads to the left d21 is emitted from the left side 21b of the light guide plate 211 to the left d21, and then 242. Of the light incident on the left side adjustment sheet portion 242, a portion of the light L5L corresponding to the light absorption rate of the left side adjustment sheet portion 242 is absorbed by the left side adjustment sheet portion 242, and the other portion of the light is absorbed by the left side adjustment sheet portion 242. , is reflected by the left side adjustment sheet portion 242 or passes through the left side adjustment sheet portion 242 . The light transmitted through the left side adjustment sheet portion 242 enters the left side diffusion sheet 251 and is diffused by the left side diffusion sheet 251 . A portion L1L of the light L6L diffused by the left side diffusion sheet 251 is reflected by the left side decorative sheet portion 61b, passes through the left edge of the light diffusion sheet 212, and reaches the left edge of the light emitting region Z1. may be ejected forward from Part of the light emitted from the light emitter 210 that spreads to the right side d22 enters the right side adjustment sheet portion 243 after being emitted to the right side d22 from the right side 21c of the light guide plate 211. . Of the light incident on the right side adjustment sheet portion 243, a portion of the light L5R corresponding to the light absorption rate of the right side adjustment sheet portion 243 is absorbed by the right side adjustment sheet portion 243, and the other portion of the light is absorbed by the right side adjustment sheet portion 243. , is reflected by the right side adjustment sheet portion 243 or passes through the right side adjustment sheet portion 243 . The light transmitted through the right side adjustment sheet portion 243 enters the right side diffusion sheet 252 and is diffused by the right side diffusion sheet 252 . Part of the light L1R out of the light L6R diffused by the right side diffusion sheet 252 is reflected by the right side decorative sheet portion 61c, passes through the right edge of the light diffusion sheet 212, and reaches the right side of the light emitting region Z1. It may be ejected forward from the edge.

By diffusing the light with the left side diffusion sheet 251 in this manner, the amount of the light L2L applied to the left vertical joint jd2 of the lighting device 20 can be more effectively reduced. In addition, by diffusing the light with the right side diffusion sheet 252, the amount of light L2R irradiated to the vertical joint jd2 on the right side of the lighting device 20 can be more effectively reduced.

Therefore, according to the sixth modification, the amount of light irradiated onto the vertical joint jd2 by the left side diffusion sheet 251 and the right side diffusion sheet 252 is more effectively It is possible to more effectively prevent the light emitting region Z2 of the vertical joint jd2 from becoming too bright. As a result, the brightness in the horizontal direction d2 of the lighting system 1 can be more effectively harmonized, so that the user of the space S can be more effectively prevented from feeling uncomfortable.

(Seventh Modification)
FIG. 16 is a perspective view showing a lighting system 1 according to a seventh modified example of this embodiment. FIG. 17 is a longitudinal sectional view showing an example of an illumination device 20 included in the illumination system 1 according to the seventh modified example of this embodiment.

As shown in FIG. 16, in the lighting system 1 according to the seventh modified example, the lighting device 20 and the board 5 are arranged with a horizontal joint jd1, which is a gap in the vertical direction d1. A horizontal joint decorative sheet 63 is provided at the horizontal joint jd1.

In order to harmonize the appearance between the surface light source decorative sheet 61 and the board decorative sheet 64, the horizontal joint decorative sheet 63 is arranged so that the surface light source decorative sheet 61 and the board decorative sheet 64 have different appearances such as color, pattern and texture. are desirable.

According to the seventh modification, by providing the horizontal joint jd1 in addition to the vertical joint jd2, it is possible to produce a three-dimensional effect different from the case where only the vertical joint jd2 is provided. In addition, by providing the horizontal joint decorative sheet 63, it is possible to harmonize the appearance in the vertical direction d1.

(Eighth modification)
FIG. 18 is a longitudinal sectional view showing an example of a lighting device 20 included in the lighting system 1 according to the eighth modified example of this embodiment.

So far, an example of the illumination system 1 in which the surface light source device 21 and the board 5 are covered with different decorative sheets 61 and 64 has been described. On the other hand, as shown in FIG. 18, the surface light source device 21 and the board 5 may be covered with a common surface light source decorative sheet 61. FIG.

According to the eighth modification, the number of parts can be reduced, and the joint of the decorative sheet 61 between the lighting device 20 and the board 5 can be eliminated.

(Ninth modification)
FIG. 19 is a longitudinal sectional view showing an example of a lighting device 20 included in the lighting system 1 according to the ninth modification of the present embodiment.

In the example of FIG. 6, the concave portion 211c is illustrated as the extracting element of the light guide plate 211. As shown in FIG. As another example, the outcoupling element can be a light scattering layer 215 laminated to the light guide plate 211, as shown in FIG. The light scattering layer 215 has a support layer 215a functioning as a binder and light scattering elements 215b dispersed within the support layer 215a. The support layer 215a may be made of a resin having visible light transparency. The light scattering element 215b has a function of changing the traveling direction of light traveling through the light scattering layer 215 by reflection, refraction, diffraction, or the like. The light scattering element 215b may have a refractive index different from that of the support layer 215a, or may be made of a material having light reflectivity such as metal. Specific examples of the light scattering element 215b include metal compounds, gas-containing porous substances, resin beads surrounding a metal compound, white fine particles, air bubbles, and particles with a different refractive index than the surroundings. In the example of FIG. 18, the lights L1 and L2 traveling through the light guide plate 211 can collide with the light scattering elements 215b in the light scattering layer 215 to change their traveling directions and then exit the light guide plate 211. becomes.

It is preferable that the refractive index of the support layer 215a of the light scattering layer 215 is equal to or higher than the refractive index of the light guide plate 211. FIG. When the refractive index of the support layer 215a of the light scattering layer 215 is lower than that of the light guide plate 211, the light L3 traveling through the light guide plate 211 is totally reflected at the interface between the light guide plate 211 and the light scattering layer 215. There is a possibility that the light cannot enter the light scattering layer 215 . After entering the light guide plate 211 from the upper side surface 21d, the light L3 travels through the light guide plate 211 to the opposite surface 211e. The presence of such light will reduce the energy efficiency of the light emitter 210 . By making the refractive index of the support layer 215a equal to or higher than the refractive index of the light guide plate 211, total reflection at the interface between the light guide plate 211 and the light scattering layer 215 is effectively prevented, and the light scattering layer 215 functions as an extraction element. can function more effectively.

(Tenth Modification)
FIG. 20 is a longitudinal sectional view showing an example of a lighting device 20 included in the lighting system 1 according to the tenth modified example of this embodiment.

As yet another example, as shown in FIG. 20, light scattering elements 215b functioning as outcoupling elements may be dispersed within the light guide plate body. In the light guide plate 211 shown in FIG. 20 , the light L traveling inside the light guide plate 211 can be scattered by colliding with the light scattering elements 215 b and emitted from the light guide plate 211 . The light scattering element 215b can be configured similarly to the light scattering element 215b described above.

Also, the light guide plate 211 may include multiple types of extraction elements. In the example shown in FIG. 20, the light guide plate 211 contains light scattering elements 215b and also has recesses 211c.

Furthermore, the light scattering power caused by the concave portions 211c in each region of the light guide plate 211 may not be constant and may be different. That is, the light scattering power of the light guide plate 211 may be changed in each region along the plate surface. In other words, the light scattering power in a certain region of the light guide plate 211 may be different from the light scattering power in other regions shifted from the region along the plate surface. By changing the light scattering power in each region along the panel surface of the light guide plate 211, it is possible to adjust the amount of light emitted from each region.

The light scattering ability is the strength of the light guide plate 211's ability to scatter light passing through it. The degree of light scattering ability can be evaluated, for example, by using the haze value [%] measured according to JIS-K7361-1, and the higher the haze value [%], the higher the light scattering ability. It will be. Therefore, in the illustrated example, the transmission haze value of light transmitted in the normal direction to the plate surface of the light guide plate 211 is not constant in each region of the light guide plate 211, but has different values.
The haze value [%] can be measured by a method based on JIS K7136 using a haze meter (manufactured by Murakami Color Research Laboratory, product number: HM-150).

(Other application examples)
So far, an example of the lighting system 1 configured by the lighting device 20 installed on the wall W of the building has been described. On the other hand, as shown in FIG. 21, the lighting system 1 may be composed of, for example, a lighting device 20 applied to a partition arranged to separate adjacent desks D, that is, personal computers PCs, in an office. . In the example of FIG. 21, the lower end of lighting device 20 reaches the floor surface (not shown).

According to the example of FIG. 21, the left side decorative sheet portion 61b can reduce the amount of light emitted from the lighting device 20 to the left d21, and the right side decorative sheet portion 61c can reduce the amount of light emitted from the lighting device 20 to the right. It is possible to reduce the amount of light irradiated in the direction d22. As a result, it is possible to prevent the borders between the adjacent lighting devices 20 and the ends of the lighting devices 20 in the horizontal direction d2 from becoming too bright, so that the brightness of the lighting system 1 in the horizontal direction d2 can be harmonized. Therefore, it is possible to prevent the desk D, that is, the user of the personal computer PC and the people around the desk D from feeling uncomfortable.

Also, as shown in FIG. 22, by reversing the arrangement position of the light emitters in the example of FIG. You may

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

While several embodiments of the disclosure have been described, these embodiments are provided by way of example and are not intended to limit the scope of the disclosure. These embodiments can be implemented in various other forms, and various omissions, replacements, and modifications can be made without departing from the scope of the invention. These embodiments and their modifications are included in the scope and gist of the present disclosure, as well as in the scope of the present disclosure described in the claims and equivalents thereof.

20 Lighting device 21 Surface light source device 21a Light emitting surface 21b Left side surface 21c Right side surface 21d Upper side surface 21e Lower side surface 61 Surface light source decorative sheet 61b Left side decorative sheet portion 61c Right side decorative sheet portion 71 Upper frame 72 Lower frame

Claims (11)

lighting devices arranged in front of and on the sides of one desk so as to separate one desk from the other adjacent desks;
The lighting device
a surface light source device having a light emitting surface, a first side surface located on the outer edge side of the light emitting surface, and a second side surface located on the outer edge side of the light emitting surface and connected to the first side surface;
holding the surface light source device, only the first side of the first side and the second side, or part of the second side and the first side of the first side and the second side a holding portion covering only the side surface;
a first decorative sheet covering at least part of the light emitting surface;
a second decorative sheet that covers at least part of the second side surface;
At least one optical layer between the second decorative sheet and the second side surface covered with the second decorative sheet for suppressing transmission of light from the second side surface toward the second decorative sheet A lighting system. lighting devices arranged in front of and on the sides of one desk so as to separate one desk from the other adjacent desks;
The lighting device
a surface light source device having a light emitting surface, a first side surface located on the outer edge side of the light emitting surface, and a second side surface located on the outer edge side of the light emitting surface and connected to the first side surface;
holding the surface light source device, only the first side of the first side and the second side, or part of the second side and the first side of the first side and the second side a holding portion covering only the side surface;
a first decorative sheet covering at least part of the light emitting surface;
a second decorative sheet that covers at least part of the second side surface;
A reflective layer is provided between the second decorative sheet and the second side surface covered with the second decorative sheet for reflecting light directed toward the second decorative sheet from the second side surface. , lighting system. lighting devices arranged in front of and on the sides of one desk so as to separate one desk from the other adjacent desks;
The lighting device
a surface light source device having a light emitting surface, a first side surface located on the outer edge side of the light emitting surface, and a second side surface located on the outer edge side of the light emitting surface and connected to the first side surface;
holding the surface light source device, only the first side of the first side and the second side, or part of the second side and the first side of the first side and the second side a holding portion covering only the side surface;
a first decorative sheet covering at least part of the light emitting surface;
a second decorative sheet that covers at least part of the second side surface;
A light shielding layer is provided between the second decorative sheet and the second side surface covered with the second decorative sheet for blocking light from the second side surface toward the second decorative sheet. , lighting system. lighting devices arranged in front of and on the sides of one desk so as to separate one desk from the other adjacent desks;
The lighting device
a surface light source device having a light emitting surface, a first side surface located on the outer edge side of the light emitting surface, and a second side surface located on the outer edge side of the light emitting surface and connected to the first side surface;
holding the surface light source device, only the first side of the first side and the second side, or part of the second side and the first side of the first side and the second side a holding part covering only the side surface;
a first decorative sheet covering at least part of the light emitting surface;
a second decorative sheet that covers at least part of the second side surface;
A dimming layer is provided between the second decorative sheet and the second side surface covered with the second decorative sheet for reducing light directed toward the second decorative sheet from the second side surface. and the lighting system. The second side surface has a pair of horizontally opposed surfaces,
The lighting system according to any one of claims 1 to 4, wherein the first side surface has a pair of surfaces facing each other in a direction non-parallel to the horizontal direction. The light emitting surface has a gradual change in the amount of emitted light along one axial direction,
5. The illumination system of claim 4, wherein the attenuating layer has a graded transmittance along the one axis. Between the second decorative sheet and the reflective layer, there is provided a light blocking layer for blocking light directed toward the second decorative sheet from the second side surface, or blocking light directed toward the second decorative sheet from the second side surface. 3. The lighting system of claim 2, wherein a dimming layer is provided for dimming. 7. The lighting system according to claim 4, further comprising a diffusion layer provided between said second decorative sheet and said dimming layer for diffusing light directed from said second side surface toward said second decorative sheet. system. 8. The lighting system according to claim 2 or 7, wherein said reflective layer is a third decorative sheet. The lighting system according to any one of claims 1 to 9, wherein said second decorative sheet is provided integrally with said first decorative sheet. 11. The lighting system according to any one of claims 1 to 10, wherein said light emitting surface has an emitted light amount decreasing upward.

Images