Surface-emitting lighting and rooms equipped with it

Abstract

To provide surface-emitting lighting that offers superior brightness when viewing an interior space from above, and possesses high design quality. [Solution] The surface-emitting light is placed in a room having a floor, side walls, and a ceiling. The surface-emitting light comprises one or more surface-emitting bodies. The surface-emitting body comprises a first main surface, a second main surface opposite to the first main surface, and a plurality of end surfaces connecting the first main surface and the second main surface. The plurality of end surfaces comprises at least a first end surface and a second end surface opposite to the first end surface. At least the first main surface and the first end surface are light-emitting surfaces. The acute angle between the first main surface and the floor is greater than 0 degrees and 90 degrees or less.

Description

Technical Field

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[0001] The present disclosure relates to surface light-emitting illumination and a room equipped with the same.

Background Art

[0002] Enhancing the brightness of a space is one means of improving space comfort. Conventionally, lighting installed on the ceiling has been widely used.

[0003] For example, ceiling lights, pendant lights attached to the ceiling, downlights incorporated into the ceiling, etc. are used. In ceiling lighting, LEDs are widely used. LED line lighting, etc. is also used as ceiling lighting.

[0004] In recent years, edge light type surface light-emitting illumination installed on the ceiling has also been developed (Patent Document 1).

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] In conventional lighting, the brightness may be insufficient when the indoor space is viewed from above (in other words, at first impression). Also, when using a large ceiling light, etc., the design property of the lighting is often low when the room feels bright at first impression.

Means for Solving the Problems

[0007] The first aspect of the present disclosure is a floor, side walls, a ceiling, a surface light-emitting illumination, and a room comprising the same, The aforementioned surface-emitting illumination comprises one or more surface-emitting elements, The surface light emitter comprises a first main surface, a second main surface opposite to the first main surface, and a plurality of end surfaces connecting the first main surface and the second main surface. Each of the aforementioned end faces comprises at least a first end face and a second end face opposite to the first end face. At least the first main surface and the first end surface are light-emitting surfaces, The present invention relates to a room in which the acute angle between the first main surface and the floor is greater than 0 degrees and less than or equal to 90 degrees.

[0008] A second aspect of this disclosure is a surface-emitting light fixture arranged in a room having a floor, side walls, and a ceiling, The aforementioned surface-emitting illumination comprises one or more surface-emitting elements, The surface light emitter comprises a first main surface, a second main surface opposite to the first main surface, and a plurality of end surfaces connecting the first main surface and the second main surface. Each of the aforementioned end faces comprises at least a first end face and a second end face opposite to the first end face. At least the first main surface and the first end surface are light-emitting surfaces, The present invention relates to surface-emitting lighting, wherein the acute angle between the first main surface and the floor is greater than 0 degrees and less than or equal to 90 degrees. [Effects of the Invention]

[0009] According to this disclosure, it is possible to provide surface-emitting lighting and a room equipped with it, which offers excellent brightness when viewing the interior space from above, as well as high design quality. [Brief explanation of the drawing]

[0010] [Figure 1] This is a schematic side view of the surface-emitting illumination according to the first embodiment, as viewed in a direction parallel to the first main surface and first end surface of each surface-emitting element. [Figure 2] Figure 1 is a schematic perspective view of the surface-emitting illumination system as seen from an oblique angle above. [Figure 3]It is a schematic side view when the surface light-emitting illumination according to the second embodiment is viewed in a direction parallel to the first main surface and the first end surface of each surface light-emitting body. [Figure 4] It is a schematic perspective view when the surface light-emitting illumination of FIG. 3 is viewed obliquely from above. [Figure 5] It is a schematic side view when the room in which the surface light-emitting illumination according to the third embodiment is installed is viewed in a direction parallel to the first main surface and the first end surface of the surface light-emitting body. [Figure 6] It is a schematic cross-sectional view showing an example of the surface light-emitting body. [Figure 7] It is a schematic cross-sectional view showing another example of the surface light-emitting body. [Figure 8] It is a schematic plan view of the surface light-emitting body of FIG. 7. [Figure 9A] It is a schematic cross-sectional view of the air cavity of the surface light-emitting body of FIG. 7. [Figure 9B] It is a schematic plan view of the air cavity of FIG. 9A. [Figure 9C] It is a schematic plan view showing variations of the air cavity.

Mode for Carrying Out the Invention

[0011] Technology (1) The room according to the first aspect of the present disclosure includes a floor, side walls, a ceiling, and surface light-emitting illumination. The surface light-emitting illumination includes one or more surface light-emitting bodies. The surface light-emitting body includes a first main surface, a second main surface opposite to the first main surface, and a plurality of end surfaces connecting the first main surface and the second main surface. The plurality of end surfaces include at least a first end surface and a second end surface opposite to the first end surface. At least the first main surface and the first end surface are light-emitting surfaces. The angle on the acute angle side formed by the first main surface and the floor is greater than 0 degree and less than or equal to 90 degrees.

[0012] The angle on the acute angle side formed by the first main surface and the floor refers to the angle on the acute angle side among the angles formed by a plane horizontal to the floor (the “plane A” or “plane B” described later) and the first main surface.

[0013] In the room described herein, the first main surface, which is the light-emitting surface of the surface light-emitting element, is positioned at a predetermined angle with respect to the floor, thereby illuminating the floor, side walls, ceiling, etc. In addition, because the first main surface is positioned at a predetermined angle with respect to the floor, the first end surface (light-emitting surface) that is continuous with the first main surface illuminates the ceiling and side walls. As a result, the entire room becomes brighter, and the brightness (first impression) when viewing the room from above is excellent. Furthermore, because the first main surface is positioned at a predetermined angle with respect to the floor, and both the first main surface and the first end surface emit light, the arrangement and light-emitting state of the surface light-emitting element are distinctive, unlike general lighting such as ceiling lights, and possess high design quality.

[0014] Technology(2) In the above technology (1), it is preferable that the first main surface faces at least one of the floor side and the side wall side. In this case, the first main surface illuminates the floor and side wall, and the first end surface illuminates the ceiling and side wall. As a result, the ambient brightness is improved.

[0015] Technology(3) In the above technology (1) or technology (2), the surface-emitting illumination may include a first surface-emitting element and a second surface-emitting element. The second end face of the first surface-emitting element and the second end face of the second surface-emitting element may be adjacent to each other. The directions of the acute angles between the first main surfaces of the first surface-emitting element and the floor may be opposite to each other and may be between 15 degrees and 85 degrees.

[0016] Generally, desks and tables are often placed near the center of a room. When such desks and tables are illuminated, the room appears brighter when viewed from above. According to the technology (3) of this disclosure, the first main surfaces of two surface-emitting elements can illuminate the floor (or desks and tables placed in the room) or multiple side walls, while the first end surfaces of the two surface-emitting elements can illuminate the ceiling or multiple side walls. As a result, the overall brightness of the room is further improved. Furthermore, according to technology (3), a higher level of design aesthetics can be achieved by providing surface-emitting lighting with two surface-emitting elements arranged at a predetermined angle.

[0017] The statement that the acute angles between the first principal surface of each surface-emitting body and the floor are opposite means that, when a plane horizontal to the floor (hereinafter sometimes referred to as "plane A") intersects with the first principal surface of each surface-emitting body, the acute angle from "plane A" to the first principal surface of one surface-emitting body is a positive value, and the angle from "plane A" to the first principal surface of the other surface-emitting body is a negative value. For example, the acute angle from "plane A" to the principal surface of one surface-emitting body may be +30 degrees, and the acute angle from "plane A" to the principal surface of the other surface-emitting body may be -30 degrees. The relationship between the angles of the third and fourth surface-emitting bodies described later follows the same relationship between the angles of the first and second surface-emitting bodies. For example, the first and second surface-emitting bodies may be located symmetrically around a plane (hereinafter sometimes referred to as "plane B") that is perpendicular to "plane A" and passes through the centers of the first and second surface-emitting bodies.

[0018] Technology(4) In the aforementioned technology (3), the surface-emitting light source may further include a third surface-emitting element and a fourth surface-emitting element. The second end face of the third surface-emitting element and the second end face of the fourth surface-emitting element may be adjacent to each other. The directions of the acute angles between the first main surfaces of the third surface-emitting element and the floor may be opposite to each other and may be between 15 degrees and 85 degrees. According to technology (4) of this disclosure, the light-emitting surfaces of the four surface-emitting elements (more specifically, each first main surface and each first end face) illuminate the floor (and desks or tables, etc.), ceiling and side walls at predetermined angles. As a result, the brightness of the entire room is improved. Furthermore, according to technology (4), a higher level of design aesthetics can be obtained by providing the surface-emitting light source with four surface-emitting elements arranged at predetermined angles.

[0019] Technology(5) In the aforementioned technology (4), each of the first surface light emitter, the second surface light emitter, the third surface light emitter, and the fourth surface light emitter may be provided with a light source on the second end face side. In the surface-emitting illumination, all of the first end faces may face outward. In the surface-emitting illumination, having the first end faces of the four surface light emitters face outward makes the area around the surface-emitting illumination brighter. Therefore, the brightness when viewing the room from above is further improved. In addition, by arranging the four surface light emitters at a predetermined angle and having the first end faces of all surface light emitters face outward, the arrangement of the surface light emitters and their light emission state become more distinctive, further enhancing the design appeal.

[0020] Technology(6) In the above technology (4) or technology (5), the acute angle between the first main surface of the first surface light-emitting body and the floor may be 15 degrees or more and 50 degrees or less. The first end surfaces of the first surface light-emitting body and the second surface light-emitting body may face the ceiling. The acute angle between the first main surface of the third surface light-emitting body and the floor may be greater than 50 degrees and 85 degrees or less. The first end surfaces of the third surface light-emitting body and the fourth surface light-emitting body may face the floor.

[0021] According to technology (6), the first end faces of the first and second surface light emitters illuminate the ceiling. The first main faces of the first and second surface light emitters illuminate the floor (and desks or tables, etc.) or the ceiling. The first end faces of the third and fourth surface light emitters illuminate the floor. The first main faces of the third and fourth surface light emitters illuminate the side walls or the floor (and desks or tables, etc.). In this way, the light-emitting surfaces of each surface light emitter face in various directions, illuminating the ceiling, side walls, floor, etc., making the entire room brighter. Furthermore, arranging the four surface light emitters at predetermined angles can further enhance the aesthetic appeal.

[0022] In this specification, when the first end face is located above the center of the surface-emitting light fixture, with respect to "surface A" passing through the center of the surface-emitting light fixture, it may be said that the first end face is facing "towards the ceiling." Similarly, when the first end face is located below the center of the surface-emitting light fixture, with respect to "surface A" passing through the center of the surface-emitting light fixture, it may be said that it is facing "towards the floor."

[0023] Technology(7) In the aforementioned technology (6), the first main surfaces of the first surface light emitter and the second surface light emitter may face the floor. The first main surfaces of the third surface light emitter and the fourth surface light emitter may face the side wall. In these cases, the light-emitting surfaces of each surface light emitter illuminate the ceiling, floor, and side wall, making the entire room brighter. Furthermore, as in technology (5) or technology (6), an even higher level of design aesthetics for surface-emitting lighting can be obtained.

[0024] Technology(8) In the above technology (4) or technology (5), the acute angle between the first main surface of the first surface light-emitting body and the floor may be greater than 50 degrees and 85 degrees or less. The first end faces of the first surface light-emitting body and the second surface light-emitting body may face the ceiling. The acute angle between the first main surface of the third surface light-emitting body and the floor may be 15 degrees or more and 50 degrees or less. The first end faces of the third surface light-emitting body and the fourth surface light-emitting body may face the floor.

[0025] According to the technology (8), the first end faces of the first and second surface light emitters illuminate the ceiling. The first main faces of the first and second surface light emitters illuminate the side walls or ceiling. The first end faces of the third and fourth surface light emitters illuminate the floor (and desks or tables, etc.). The first main faces of the third and fourth surface light emitters illuminate the side walls or floor (and desks or tables, etc.). In this way, the light-emitting surfaces of each surface light emitter face in various directions, illuminating the ceiling, side walls, floor, etc., making the entire room brighter. Furthermore, arranging the four surface light emitters at predetermined angles can further enhance the aesthetic appeal.

[0026] Technology(9) In the aforementioned technology (8), the first main surfaces of the first surface light emitter and the second surface light emitter may face the side wall. The first main surfaces of the third surface light emitter and the fourth surface light emitter may face the floor. In these cases, the light-emitting surface of each surface light emitter illuminates the ceiling, floor, and side wall, making the entire room brighter. Furthermore, as in technology (8), an even higher level of design aesthetics for surface-emitting lighting can be obtained.

[0027] Technology(10) In any one of the above technologies (1) to (9), the surface-emitting light may be positioned at a distance from the ceiling and the side wall. In this case, the surface-emitting light can more easily illuminate the ceiling and the side wall, further improving the overall brightness of the room.

[0028] Technology(11) In the aforementioned technology (10), the surface-emitting light may be positioned on the ceiling side, at or near the center of the space enclosed by the side walls. In this case, the surface-emitting light can more easily illuminate the entire space inside the room, thus improving the overall brightness of the room.

[0029] Technology(12) In the above technology (1), the surface light emitter may be attached to the side wall with the second main surface facing the side wall. In this case, the first end surface may illuminate the ceiling and the first main surface may illuminate the inside of the room. The first main surface emits light toward the side wall opposite to where the surface light emitter is installed, and the first end surface illuminates the ceiling, thereby brightening the entire room.

[0030] Technology(13) In any one of the above technologies (1) to (12), the surface light emitter may have a light source on the second end face side and a light extraction layer having an air cavity. In this case, the light from the light source is refracted by the air cavity and emitted from the first main surface. In other words, since highly directional light from the light source can be efficiently emitted from the first main surface, the surrounding area can be illuminated more brightly and widely than from a larger first main surface.

[0031] Technology(14) The present disclosure also includes surface-emitting lighting. The surface-emitting lighting of the present disclosure is arranged in a room having a floor, side walls, and a ceiling. The surface-emitting lighting comprises one or more surface-emitting elements. The surface-emitting element comprises a first main surface, a second main surface opposite to the first main surface, and a plurality of end surfaces connecting the first main surface and the second main surface. The plurality of end surfaces comprises at least a first end surface and a second end surface opposite to the first end surface. At least the first main surface and the first end surface are light-emitting surfaces. The acute angle between the first main surface and the floor is greater than 0 degrees and less than or equal to 90 degrees.

[0032] The first main surface, which is the light-emitting surface of the surface light-emitting body, is positioned at a predetermined angle with respect to the floor, so that the first main surface illuminates the floor and side walls. In addition, because the first main surface is positioned at a predetermined angle with respect to the floor, the first end surface, which is continuous with the first main surface, illuminates the ceiling and side walls. As a result, the entire room can be brightened, and the brightness (first impression) when viewing the room from above is excellent. Furthermore, because the first main surface is positioned at a predetermined angle with respect to the floor, and both the first main surface and the first end surface emit light, the arrangement and illumination state of the surface light-emitting body are distinctive, resulting in high design quality.

[0033] Technology(15) In the aforementioned technology (14), it is preferable that the first main surface faces at least one of the floor side and the side wall side. In this case, the first main surface illuminates the floor and the side wall, and the first end surface illuminates the ceiling and the side wall. As a result, the ambient brightness is further improved.

[0034] The surface-emitting lighting and rooms equipped therewith of this disclosure will be described in more detail below, including the above techniques (1) to (15), with reference to drawings as necessary. To the extent that it is not technically inconsistent, at least one of the above techniques (1) to (15) may be combined with at least one of the elements described below. Note that the figures are schematic, and the dimensions (e.g., thickness) of each component may differ from those of the actual components.

[0035] [Surface-emitting illumination] The surface-emitting illumination of this disclosure comprises one or more surface-emitting elements. The surface-emitting element comprises a first principal surface, a second principal surface opposite to the first principal surface, and a plurality of end faces connecting the first principal surface and the second principal surface. Each end face is continuous with the first principal surface and the second principal surface. In the plurality of end faces, adjacent end faces are continuous with each other.

[0036] In a surface-emitting material, each end face comprises at least a first end face and a second end face opposite to the first end face. For example, if the first and second principal faces are rectangular, four end faces exist so as to surround the periphery of the first and second principal faces, with each of the four sides of the principal face being continuous with the other four sides. In this case, when the first principal face is viewed from the normal direction, the pair of end faces located on two opposing sides are the first and second end faces. The pair of end faces located on the remaining two opposing sides are sometimes referred to as the third and fourth end faces. The first, third, second, and fourth end faces exist so as to surround the periphery of the first and second principal faces.

[0037] In a surface light emitter, at least the first principal surface and the first end surface are light-emitting surfaces. In addition to the first principal surface, the second principal surface may also be a light-emitting surface. The second principal surface does not have to be a light-emitting surface. The second end surface may or may not be a light-emitting surface. If the surface light emitter has a third end surface and a fourth end surface, these end surfaces may or may not be light-emitting surfaces.

[0038] The surface-emitting lighting of this disclosure is arranged in a room having a floor, side walls, and a ceiling. In the surface-emitting lighting of this disclosure, the acute angle between the first main surface and the floor is greater than 0 degrees and 90 degrees or less. This angle may be between 10 degrees and 85 degrees, or between 15 degrees and 85 degrees. By arranging the first main surface, which is the light-emitting surface, at such an angle with respect to the floor, the first main surface illuminates at least one selected from the group consisting of the floor, side walls, and ceiling. In addition, the first end surface illuminates at least one of the side walls and the ceiling. As a result, the entire room can be brightened, and the brightness when viewing the interior space from above is excellent. Furthermore, because the first main surface is arranged at a predetermined angle, the arrangement of the surface-emitting body itself has high design quality. In addition, high design quality can be obtained from the relationship between the light emission of the first main surface and the first end surface and the arrangement of the surface-emitting body.

[0039] The first main surface may face at least one of the ceiling side and the side wall side. From the viewpoint of easily improving the overall brightness of the room by illuminating a wide area with the first main surface, it is preferable that the first main surface faces at least one of the floor side and the side wall side.

[0040] The number of surface-emitting elements in surface-emitting lighting may be, for example, 1 to 8, 2 to 8, 2 to 6, or 2 to 4. When there are two or more surface-emitting elements, the design can be further enhanced by the arrangement of the elements.

[0041] A surface-emitting light source may, for example, comprise a first surface-emitting element and a second surface-emitting element. In this case, it is preferable that the second end face of the first surface-emitting element and the second end face of the second surface-emitting element are adjacent to each other. Furthermore, it is preferable that the directions of the acute angles formed between the first main surfaces of the first and second surface-emitting elements and the floor are opposite to each other. The acute angles formed between the first main surfaces of each surface-emitting element and the floor can be selected from the above range, for example, and are preferably between 15 degrees and 85 degrees. By comprising at least a first surface-emitting element and a second surface-emitting element, and having the angles in opposite directions, the design can be further enhanced. In addition, because the second end faces are adjacent, the first end face, which is the light-emitting surface, faces outward in the surface-emitting light source, making it easier to brightly illuminate the surroundings, which is advantageous in improving brightness. Furthermore, since the first main surfaces of the first and second surface light emitters are positioned at a predetermined angle, the first main surface illuminates the floor (or desks, tables, etc.) and side walls, while the first end surface illuminates the ceiling and floor. This further improves the overall brightness of the room.

[0042] The surface-emitting light source may further include a third surface-emitting element and a fourth surface-emitting element in addition to the first and second surface-emitting elements. Preferably, the second end face of the third surface-emitting element and the second end face of the fourth surface-emitting element are adjacent to each other. Preferably, the directions of the acute angles between the first main surfaces of the third and fourth surface-emitting elements and the floor are opposite to each other. The acute angles between the first main surfaces of each surface-emitting element and the floor can be selected from the above range, for example, and are preferably between 15 degrees and 85 degrees. The design can be further enhanced by the surface-emitting light source comprising at least four surface-emitting elements and having the angles of the third and fourth surface-emitting elements opposite to each other. Furthermore, because the second end faces are adjacent, the first end faces outward in the surface-emitting light source, making it easier to brightly illuminate the surroundings, which is advantageous in improving brightness. Furthermore, since the first main surfaces of the third and fourth light-emitting elements are positioned at a predetermined angle, the first main surface and the first end surface illuminate the floor (or a desk or table, etc.), ceiling, or side wall. This further improves the overall brightness of the room.

[0043] In each surface-emitting element of surface-emitting lighting, a light source may be placed on at least one side selected from the main surfaces and end surfaces other than the first main surface and the first end surface. For example, the light source may be placed on the second main surface side, or on the second end surface side. Alternatively, the light source may be placed on the third end surface side or the fourth end surface side. From an aesthetic standpoint, it is preferable to place the light source on the end surface side, and more preferable to place the light source on the second end surface side. Furthermore, when the light source is placed on the second end surface side, the light from the light source is refracted and emitted from the first main surface, but the light that is not emitted from the first main surface tends to be emitted from the first end surface on the opposite side of the second end surface. Therefore, in addition to the light emitted from the first main surface, the surrounding area can also be brightly illuminated by the light emitted from the first end surface. For example, each of the first, second, third, and fourth surface-emitting elements may have a light source on the second end surface side. When the second end faces of each surface-emitting element are adjacent, the light source in the surface-emitting illumination will be concentrated inward, and the first end face, which is the light-emitting surface, will face outward. This further improves the brightness around the surface-emitting illumination and enhances its aesthetic appeal.

[0044] Multiple surface-emitting elements may be connected at their second end faces using connecting members or the like. For example, each surface-emitting element may be arranged so that its second end face contacts the circumferential surface of a cylindrical or columnar connecting member, with its first end face being the tip, and each element protruding from the circumferential surface. When the first and second surface-emitting elements (or the third and fourth surface-emitting elements) are adjacent, this includes cases where a connecting member is interposed between them. When connected with a connecting member, the light source may be provided on the second end side of each surface-emitting element (e.g., the second end) or on the connecting member. The connecting member may house electrical wiring or the like that connects to the light source.

[0045] When a surface-emitting light fixture has two or more surface-emitting elements, the second end faces of some of the surface-emitting elements may be positioned on the inside, while the second end faces of the remaining surface-emitting elements may be positioned on the outside. From the viewpoint of further improving the brightness around the surface-emitting light fixture, it is preferable that the second end faces of all surface-emitting elements are positioned on the inside, and the first end faces of all surface-emitting elements are positioned on the outside. In a surface-emitting light fixture, some of the surface-emitting elements may be positioned on the ceiling side, while the remaining surface-emitting elements may be positioned on the floor side. For example, half of the surface-emitting elements in a surface-emitting light fixture may be positioned on the ceiling side, and the other half on the floor side. Taking the case where a surface-emitting light fixture has four surface-emitting elements—a first surface-emitting element, a second surface-emitting element, a third surface-emitting element, and a fourth surface-emitting element—as an example, the first and second surface-emitting elements may be positioned on the ceiling side, and the third and fourth surface-emitting elements may be positioned on the floor side. In such a case, an even higher level of design aesthetics can be obtained.

[0046] The acute angles between the first principal surface of each of the first-faced light-emitting body, second-faced light-emitting body, third-faced light-emitting body, and fourth-faced light-emitting body and the floor may be the same for at least two of them, or they may all be different. As described above, the directions of the acute angles between the first principal surface of each of the first-faced light-emitting body and second-faced light-emitting body (or third-faced light-emitting body and fourth-faced light-emitting body) and the floor may be opposite to each other. Also, the directions of the acute angles between the first principal surface of each of the first-faced light-emitting body and third-faced light-emitting body (or second-faced light-emitting body and fourth-faced light-emitting body) and the floor may be opposite to each other.

[0047] For example, the following embodiment (first embodiment) is preferred. In the first embodiment, the acute angle between the first main surface of the first surface light-emitting body and the floor may be 15 degrees or more and 50 degrees or less. The acute angle between the first main surface of the third surface light-emitting body and the floor may be greater than 50 degrees and 85 degrees or less. Each surface light-emitting body has a light source on the second end surface side, and it is preferable that the first end surface of all surface light-emitting bodies faces outward. In this case, the first surface light-emitting body and the second surface light-emitting body are located on the upper side (in other words, the ceiling side) in the surface-emitting illumination, and the first end surface of each surface light-emitting body faces upward (towards the ceiling). The third surface light-emitting body and the fourth surface light-emitting body are located on the lower side (in other words, the floor side) in the surface-emitting illumination, and the first end surface of each surface light-emitting body faces downward (towards the floor). The first end surface illuminates either the ceiling or the floor, while the first main surface illuminates the floor (or desk, etc.), ceiling, or side wall, further improving the overall brightness of the room. Furthermore, a higher aesthetic appeal for surface-emitting lighting can be achieved. In this case, the first main surfaces of the first and second surface-emitting elements may face the floor, while the first main surfaces of the third and fourth surface-emitting elements may face the side wall. Because surface-emitting lighting makes it easier to evenly illuminate the entire room, the brightness can be further improved.

[0048] The following embodiment (second embodiment) is also preferred. More specifically, the acute angle between the first main surface of the first surface light-emitting body and the floor may be greater than 50 degrees and 85 degrees or less. The acute angle between the first main surface of the third surface light-emitting body and the floor may be between 15 degrees and 50 degrees. Each surface light-emitting body has a light source on its second end surface side, and it is preferable that the first end surface of all surface light-emitting bodies faces outward. In this case, the first surface light-emitting body and the second surface light-emitting body are located on the upper side (in other words, the ceiling side) in the surface-emitting illumination, and the first end surface of each surface light-emitting body faces upward (towards the ceiling). The third surface light-emitting body and the fourth surface light-emitting body are located on the lower side (in other words, the floor side) in the surface-emitting illumination, and the first end surface of each surface light-emitting body faces downward (towards the floor). The first end surface illuminates either the ceiling or the floor, while the first main surface illuminates the floor (or desk, etc.), ceiling, or side wall, further improving the overall brightness of the room. Furthermore, a higher aesthetic appeal for surface-emitting lighting can be achieved. In this case, the first main surfaces of the first and second surface-emitting elements may face the side wall, while the first main surfaces of the third and fourth surface-emitting elements may face the floor. Because surface-emitting lighting makes it easier to evenly illuminate the entire room, the brightness can be further improved.

[0049] In a room, surface-emitting lights may be positioned at a distance from the ceiling and side walls. In this case, the surface-emitting lights can more easily illuminate the ceiling and side walls, further improving the overall brightness of the room. From the viewpoint of being able to widely illuminate the floor, desks, etc., it is preferable that the surface-emitting lights be positioned on the upper side of the room (in other words, towards the ceiling). The upper side of the room (towards the ceiling) means above (towards the ceiling) "surface A" that passes through the average center position of the room's height. Also, from the viewpoint of easily illuminating the entire side wall, it is preferable that the surface-emitting lights be positioned in or near the center of the space enclosed by the side walls of the room.

[0050] The distance from the ceiling to the highest point of the surface-emitting light fixture may be determined according to the size of the room, the height of the ceiling, and the size of the surface-emitting light fixture. The distance from the ceiling to the highest point of the surface-emitting light fixture may be between 50 mm and 3000 mm, or between 100 mm and 1000 mm. For example, in a room where the length and width of the floor and ceiling are both between 3 m and 7 m, and the height is between 2.5 m and 4 m, it is preferable that the distance from the ceiling to the highest point of the surface-emitting light fixture be between 50 mm and 500 mm.

[0051] The surface-emitting light may be mounted on the side wall of the room (third embodiment). For example, the surface-emitting element may be mounted on the side wall with its second main surface facing the side wall. In this case, the first end surface is positioned to illuminate the ceiling. The first main surface of the surface-emitting element illuminates the inside of the room. The first main surface emits light toward the side wall opposite to the side wall on which the surface-emitting element is mounted, and the first end surface illuminates the ceiling. Therefore, even in this configuration, the overall brightness of the room can be improved.

[0052] Figures 1 and 2 show an example of a first embodiment of surface-emitting illumination. Figure 1 is a schematic side view of the surface-emitting illumination as seen in a direction parallel to the first main surface and first end surface of each surface-emitting element. Figure 2 is a schematic perspective view of the surface-emitting illumination of Figure 1 as seen from diagonally above.

[0053] The surface-emitting light 10A in Figures 1 and 2 comprises a first surface-emitting element 11, a second surface-emitting element 12, a third surface-emitting element 13, and a fourth surface-emitting element 14. Each of these surface-emitting elements 11 to 14 comprises a first main surface M1 and a second main surface M2, and a first end surface E1 and a second end surface opposite to the first end surface E1. The surface-emitting elements 11 to 14 are connected by a cylindrical connecting member (or support) 15 on the side of their respective second end surfaces. The surface-emitting elements 11 to 14 are arranged so that their first end surface E1 faces outward from the surface-emitting light 10A, and they protrude radially from the circumferential surface of the connecting member 15. Each of the surface-emitting elements 11 to 14 is equipped with a light source L on the side of its second end surface. The acute angle θ1 formed by the horizontal plane H1 and the first surface light emitter 11, and the acute angle θ2 formed by the second surface light emitter 12, are approximately 30 degrees, and the directions of the angles are opposite to each other. The acute angle θ3 formed by the horizontal plane H2 and the third surface light emitter 13, and the acute angle θ4 formed by the second surface light emitter 12, are approximately 85 degrees, and the directions of the angles are opposite to each other. The light emitted from each light source L to each of the surface light emitters 11-14 is emitted outwards from the first main surface M1 and the first end surface E1 of the surface light emitters 11-14. The surface light emitters 11-14 are arranged at predetermined angles as described above. As a result, the light emitted from the first main surface M1 of the first surface light emitter 11 and the second surface light emitter 12 illuminates the floor and side walls of the room, and the light emitted from the first end surface E1 illuminates the ceiling and side walls. Furthermore, the light emitted from the first main surface M1 of the third surface light-emitting element 13 and the fourth surface light-emitting element 14 illuminates the side wall, and the light emitted from the first end surface E1 illuminates the floor. The light that hits the ceiling is reflected and illuminates the floor, desk, etc. The light that hits the side wall is reflected and illuminates the interior of the room and the opposite side wall. In this way, the surface-emitting lighting of this disclosure can brightly illuminate the entire room with the light emitted from the first main surface M1 and the first end surface E1. In addition, the surface-emitting lighting also has a high aesthetic appeal.

[0054] Figures 3 and 4 show an example of a second embodiment of surface-emitting illumination. Figure 3 is a schematic side view of the surface-emitting illumination as seen in a direction parallel to the first main surface and first end surface of each surface-emitting element. Figure 4 is a schematic perspective view of the surface-emitting illumination of Figure 3 as seen from diagonally above.

[0055] The surface-emitting lighting 10B in Figures 3 and 4 is the same as the examples in Figures 1 and 2, except that the angles of the surface emitters 11-14 are different and the orientation of the first main surface is different. The acute angle θ1 formed by the first surface emitter 11 and the acute angle θ2 formed by the second surface emitter 12 with the plane H1 horizontal to the floor is approximately 85 degrees, and the directions of the angles are opposite to each other. The acute angle θ3 formed by the third surface emitter 13 and the acute angle θ4 formed by the second surface emitter 12 with the plane H2 horizontal to the floor is approximately 30 degrees, and the directions of the angles are opposite to each other. The light emitted from the first main surface M1 of the first surface emitter 11 and the second surface emitter 12 illuminates the side walls of the room, and the light emitted from the first end surface E1 illuminates the ceiling. Furthermore, the light emitted from the first main surface M1 of the third-face light emitter 13 and the fourth-face light emitter 14 illuminates the floor (or a desk, etc.), and the light emitted from the first end surface E1 illuminates the side wall and floor.

[0056] Figure 5 shows an example of a third embodiment of surface-emitting lighting. Figure 5 is a schematic side view of a room in which surface-emitting lighting is installed, viewed in a direction parallel to the first main surface and first end surface of each surface-emitting element. In Figure 5, surface-emitting elements 10 and 101 are arranged on the side walls of opposing rooms, respectively. Surface-emitting elements 10 and 101 are arranged so that their first main surface M1 faces the side wall opposite to the side wall in which they are installed. The first end surface E1 of surface-emitting elements 10 and 101 faces the ceiling, and the second end surface E2 faces the floor. A light source L is located on the second end surface E2 side of surface-emitting elements 10 and 101. Light emitted from the light source L is emitted from the first main surface M1 toward the side wall and from the first end surface E1 toward the ceiling. The light that hits the ceiling is reflected and illuminates the floor, desk, etc. In this way, the brightness of the entire room can be improved by surface-emitting lighting. Furthermore, unlike conventional lighting, the surface-emitting illumination of this disclosure has a high degree of design appeal.

[0057] The first to third embodiments (including Figures 1 to 5) primarily illustrate cases where the first principal surface and the first end surface emit light, but this disclosure is not limited to these cases. In the first to third embodiments (including Figures 1 to 5), the second principal surface may also be an emitting surface in addition to the first principal surface. In addition to the first end surface, other end surfaces may also be emitting surfaces.

[0058] While specific embodiments 1 to 3 (including Figures 1 to 5) have been described, the following description is not limited to these specific embodiments and applies to the description of room or surface-emitting lighting in this disclosure.

[0059] (Surface-emitting device) A surface light emitter is a sheet-like light emitter equipped with a light extraction layer (also called a light guide layer). The term "sheet-like" is used to include plate-like or film-like forms, regardless of the rigidity (flexibility) and thickness of the sheet. A surface light emitter does not necessarily have to be flat (or plate-like), and the first and second main surfaces may be curved as needed. A surface light emitter may be equipped with a light source. The position of the light source is as described above. When a surface light emitter is equipped with a light source on the second end face side, light is emitted from the first main surface (and possibly the second main surface) by the light extraction layer, and light that was not emitted from the main surfaces is easily emitted from the first end face.

[0060] The light extraction layer has a structure that emits light from the light source from at least the first main surface. When the light source is placed on the end face side of a surface emitter, such as the second end face side, it is necessary to refract the light from the light source within the light extraction layer and emit it from the first main surface. Therefore, the above structure needs to be a structure that refracts light. A structure that refracts light is composed of multiple parts with different refractive indices, for example. By adjusting the material, shape, and distribution of the parts with different refractive indices, light from the light source can be emitted from the first main surface and the first end face, and the amount of emission can be adjusted.

[0061] The light extraction layer may include air cavities as a structure for refracting light. Preferably, the light extraction layer has multiple air cavities. Light from a light source is refracted by the air cavities and emitted from the first main surface (and, if necessary, the second main surface). If the light source is on the second end side, light emitted from the light source that travels without hitting the air cavities, and light that has been repeatedly refracted and directed towards the first end surface, are emitted from the first end surface. For a surface light emitter equipped with a light extraction layer (light direction conversion layer), see, for example, International Publication No. 2022 / 260080.

[0062] Embodiments of surface-emitting elements are shown below with reference to the drawings. However, the elements and numerical ranges described below are not limited to the specific embodiments described below and can be arbitrarily combined with the descriptions of rooms and surface-emitting lighting in this disclosure.

[0063] Figure 6 is a schematic cross-sectional view of a first surface light emitter equipped with a light extraction layer. The first surface light emitter 11 has a first main surface M1 and a first end surface E1, which are light-emitting surfaces, and is in the shape of a sheet. The first surface light emitter 11 includes a light guide layer (light guide plate) 10 and a direction changing layer 60A that changes the direction of light. The direction changing layer 60A includes a base layer 30, a shaping film 62A in which a light-refracting cavity 64A is formed, an adhesive layer (or bonding layer) 51 that bonds the light guide layer 10 and the base layer 30, and an adhesive layer (or bonding layer) 53 that bonds the base layer 30 and the shaping film 62A. A light source LS, such as an LED, is arranged on the second end surface E2 side of the first surface light emitter 11 (more specifically the light guide layer 10). Light emitted from the light source LS passes through the first surface emitter 11, is refracted in the cavity 64A, and is emitted from the first main surface M1 on the direction conversion layer 60A side. Light that does not reach the first main surface M1 is emitted from the first end surface E1 opposite to the second end surface E2, or from other end surfaces. In addition to the first main surface M1, light may also be emitted from the second main surface on the opposite side of the first main surface M1. Figure 6 shows an example of the structure of the first surface emitter 11, but the second, third, and fourth surface emitters may have the same structure as the first surface emitter 11. For details on the structure of the surface emitters and how light propagates, please refer to the explanations in Figures 7 and 8 below. For details on the structure of the cavity, please refer to the explanations in Figures 9A to 9C below.

[0064] Figure 7 shows a schematic cross-sectional view of a surface light emitter 100A equipped with a light extraction layer. The surface light emitter 100A in Figure 7 is sheet-like and has two emission surfaces facing opposite directions. The surface light emitter 100A has a first emission surface (first main surface, lower in Figure 1) that emits the first light LRa and a second emission surface (second main surface, upper in Figure 1) that emits the second light LRb. The first light LRa is emitted in the -Z direction in Figure 6, and the second light LRb is emitted in the Z direction.

[0065] The surface light emitter 100A comprises a light source LS and a light guide member 100A(G) for the surface light emitter. Hereinafter, the light guide member for the surface light emitter will be indicated by adding (G) after the reference numeral of the surface light emitter 100A. The light guide member 100A(G) for the surface light emitter comprises a light receiving section that receives light emitted from the light source LS, a light guide layer 10 having a main surface A on the first emission surface side and a main surface B on the second emission surface side, and a light distribution control structure having a plurality of internal spaces (air cavities) 64A. The light receiving section of the light guide member 100A(G) for the surface light emitter is, for example, the side of the light guide layer 10 on the light source LS side (light receiving side). Each of the plurality of air cavities 64A has a first inclined surface ISa that directs a portion of the light propagating within the light guide layer 10 toward the first emission surface side by total internal reflection (TIR), and a second inclined surface ISb on the opposite side of the first inclined surface ISa. The second light LRb emitted from the second emission surface is light that has entered the air cavity 64A from the first inclined surface ISa and passed through the air cavity 64A. The second light LRb is transmitted through the upper surface of the air cavity 64A (the interface with the adhesive layer 54) or the second inclined surface ISb. The first light LRa and the second light LRb may be refracted as they pass through the interface, depending on the refractive index of the materials constituting the interface.

[0066] In the light guide member 100A(G) for a surface light emitter, the light distribution control structure having a plurality of air cavities 64A is formed in the direction conversion layer 60A located on the main surface B side of the light guide layer 10. The direction conversion layer 60A having a plurality of air cavities 64A is composed of a shaping film 62A having recesses 64A (indicated by the same reference numeral as the air cavities 64A) on its surface and an adhesive layer 54. Note that the air cavities 64A are not limited to this example and may be formed, for example, in a direction conversion layer located on the first main surface side of the light guide layer 10. Alternatively, a plurality of air cavities 64A may be formed inside the light guide layer 10 or in the direction conversion layer.

[0067] The surface light emitting member 100A(G) is configured to emit a first light LRa having a first light distribution from a first emission surface and a second light LRb having a second light distribution from a second emission surface, by a light distribution control structure. For example, when the ray with the highest intensity in the first light distribution is designated as the first principal ray and the ray with the highest intensity in the second light distribution is designated as the second principal ray, the ratio of the intensity of the first principal ray to the intensity of the second principal ray may be controlled to a range of 1:4 or more and 4:1 or less. The ratio of the intensity of the first principal ray to the intensity of the second principal ray may be, for example, within a range of 0.5 or more and 1.3 or less. Therefore, both the first light LRa and the second light LRb can be used for illumination. However, the light LRa may be used primarily for illumination, not limited to these cases. Furthermore, since the light that does not emit from the first and second emission surfaces is emitted from the end face (first end face) opposite to the light source LS, this light is used to illuminate the area around the surface-emitting illumination.

[0068] For example, the polar angle θ5 of the first principal ray from the normal to the first emission surface is smaller than the polar angle θ6 of the second principal ray from the normal to the second emission surface. For example, the polar angle θ5 is between 0° and 40°, and the polar angle θ6 is between 30° and 70°. The first and second light distributions can be controlled, for example, by adjusting the cross-sectional shape, planar shape, size, arrangement density, and distribution of the air cavity 64A. For example, the inclination angle θa of the first inclined surface ISa is between 10° and 70°. Also, the inclination angle θb of the second inclined surface ISb is between 50° and 100°. The cross-sectional shape of the air cavity 64A is triangular, as exemplified here, but is not limited to this, and may be trapezoidal, etc.

[0069] The light guide member 100A(G) for the surface light emitter may have a visible light transmittance of 60% or more and a haze value of less than 30%. Preferably, the visible light transmittance is 70% or more, and more preferably 80% or more. Preferably, the haze value is less than 10%, and more preferably 5% or less. When the light guide member 100A(G) for the surface light emitter has such a high visible light transmittance and low haze value, an object (display) can be seen through the light guide member 100A(G). Here, visible light is defined as light with a wavelength of 380 nm or more and 780 nm or less. The visible light transmittance and haze value can be measured, for example, using a haze meter (manufactured by Murakami Color Technology Laboratory: product name HM-150).

[0070] The multiple air cavities 64A, which are a light distribution control structure, have an area ratio (occupancy rate) of 1% to 80% of the area of ​​the light guide layer 10 when viewed from the direction normal to the main surface of the light guide layer 10. The upper limit is more preferably 50% or less, and even more preferably 45% or less. To obtain high transmittance and / or a low haze value, the above occupancy rate is preferably 30% or less, more preferably 10% or less, and even more preferably 5% or less. For example, when the occupancy rate of the air cavity is 50%, a haze value of 30% can be obtained. The occupancy rate of the air cavities 64A may be uniform, or the occupancy rate may be increased with increasing distance so that the brightness does not decrease even when the distance from the light source LS increases. For mass production using the roll-to-roll method or the roll-to-sheet method, it is preferable that the occupancy rate of the air cavities 64A be uniform.

[0071] In the surface light emitting member 100A(G), a shaping film 62A is bonded to the main surface B of the light guide layer 10 by an adhesive layer 52, and the shaping film 62A is bonded to the base layer 30 by an adhesive layer 54 that constitutes the shaping film 62A and the direction changing layer 60A. The light guide layer 10 and the base layer 30 may be transparent substrates or films.

[0072] Next, with reference to Figure 8, an example of the planar shape and arrangement of the air cavity 64A will be described. Figure 8 shows a schematic plan view of the surface light emitter 100A.

[0073] As shown in Figure 8, the multiple air cavities 64A are discretely arranged, for example, in the light-guiding direction (Y direction) of the light-guiding layer 10 and in a direction perpendicular to the light-guiding direction (X direction). The size of the air cavities 64A (length L, width W: see Figures 9A and 9B) is preferably such that the length L is 10 μm or more and 500 μm or less, and the width W is preferably 1 μm or more and 100 μm or less. Furthermore, from the viewpoint of light extraction efficiency, the height H (see Figure 9A) is preferably 1 μm or more and 100 μm or less.

[0074] Here, an example is shown in which multiple air cavities 64A are discretely arranged in the light-guiding direction (Y direction) and in a direction perpendicular to the light-guiding direction (X direction) of the light-guiding layer 10. However, this is not limited to this example, and multiple air cavities 64A can be discretely arranged in the light-guiding direction (Y direction) and in a direction intersecting the light-guiding direction of the light-guiding layer 10. The discrete arrangement of air cavities 64A can be appropriately set according to the shape of the light-guiding layer 10 and the desired light distribution. Although light propagates in various directions within the light-guiding layer 10, the Y direction is referred to as the light-guiding direction, and light having a component in the Y direction (non-zero) is said to be propagating in the Y direction. The same applies to other directions. That is, light propagating in the -Y direction includes all light having a component in the -Y direction (non-zero).

[0075] Multiple air cavities 64A are arranged discretely, for example, in the light-guiding direction and in directions intersecting the light-guiding direction. The discrete arrangement may or may not have periodicity (regularity) in at least one direction. However, from the viewpoint of mass production, it is preferable that the multiple internal spaces 64A are arranged uniformly. For example, in the example shown in Figure 8, multiple air cavities 64A having substantially the same shape and a curved surface convex in the same direction are arranged discretely and periodically throughout the entire region of the light-guiding layer 10 in the light-guiding direction (Y direction) and in a direction perpendicular to the light-guiding direction (X direction). In this case, the pitch Px is preferably, for example, 10 μm or more and 500 μm or less. The pitch Py is preferably, for example, 10 μm or more and 500 μm or less. In the example shown in Figure 8, there are further internal spaces arranged with a 1 / 2 pitch offset in each of the Y and X directions.

[0076] As shown in Figure 8, when viewed from the direction normal to the first main surface of the light guide layer 10, the first inclined surface ISa forms a curved surface that is convex toward the light source LS. The light source LS is, for example, an LED device, and multiple LED devices are arranged in the X direction. Since the light emitted from each of the multiple LED devices has a spread in the Y direction, having a curved surface that is convex toward the light source LS allows the first inclined surface ISa to act uniformly on the light. However, if a coupled optical system is provided between the light source LS and the light receiving part of the surface light emitting member 100A(G), and light with high parallelism (light with small spread in the Y direction) is incident, the first inclined surface ISa may be parallel to the X direction. Also, instead of discrete air cavities 64A, air cavities such as grooves (e.g., triangular prisms) extending in the X direction may be used.

[0077] Next, the shape of the air cavity 64A will be described with reference to Figures 9A, 9B, and 9C. Figure 9A is a schematic cross-sectional view of the air cavity 64A, Figure 9B is a schematic plan view of the air cavity 64A, and Figure 9C is a schematic plan view showing a variation of the air cavity 64A.

[0078] As shown in Figure 9A, the cross-sectional shape of the air cavity 64A is, for example, triangular. The inclination angle θa of the first inclined surface ISa on the light source LS side is, for example, 10° to 70°. If the inclination angle θa is less than 10°, the controllability of light distribution decreases and the light extraction efficiency may also decrease. On the other hand, if the inclination angle θa exceeds 70°, for example, processing of the shaping film may become difficult. The inclination angle θb of the second inclined surface ISb is, for example, 50° to 100°. If the inclination angle θb is less than 50°, stray light may be generated in unintended directions. On the other hand, if the inclination angle θb exceeds 100°, for example, processing of the shaping film may become difficult. As shown in Figures 9B and 9C, the length L of the air cavity 64A is preferably 10 μm to 500 μm, and the width W is preferably 1 μm to 100 μm. The length L is, for example, twice or more the width W. The height H (see Figure 9A) is preferably between 1 μm and 100 μm. However, depending on the processing accuracy when forming the shaped film having the recess with the planar shape shown in Figure 9B, a recess with the planar shape shown in Figure 9C may be formed. Even in such cases, the planar shape of the cavity can be characterized by its length L and width W.

[0079] For information on shaping films with cavities, see, for example, the description in Japanese Patent Publication No. 2013-524288.

[0080] [Examples] The present invention will be described below in detail based on examples and comparative examples, but the present invention is not limited to the following examples.

[0081] Examples 1 and 2 In Example 1, a surface-emitting illumination system was fabricated as shown in Figures 1 and 2. In Example 2, a surface-emitting illumination system was fabricated as shown in Figures 3 and 4. Each surface-emitting element was formed as a sheet-like surface-emitting element with the structure shown in Figure 6. The width (light-guiding distance) of the light-guiding layer 10 was 300 mm, and the panel width (length of the surface-emitting element in the direction perpendicular to the light-guiding distance) was 1200 mm. The configuration of the surface-emitting elements is as follows. Light guide layer 10: Acrylic resin sheet, 2mm thick Adhesive layers 51, 53: Acrylic adhesive Substrate layer 30: Acrylic resin, 30 μm thick θa:50 degrees Light source LS: Multiple LED light sources are arranged at predetermined intervals (along the X direction) on the end face side of the second end face of the light guide layer 10. Shaping film 62A for forming the internal space (cavity): A textured film was manufactured according to the method described in Japanese Patent Publication No. 2013-524288. Specifically, the surface of a polymethyl methacrylate (PMMA) film was coated with lacquer (FineCure RM-64, manufactured by Sanyo Chemical Industries, Ltd.), an optical pattern was embossed onto the film surface containing the lacquer, and then the lacquer was cured to produce the desired textured film. The total thickness of the textured film was 130 μm.

[0082] The fabricated surface-emitting light was installed near the ceiling, close to the center of the room. The distance from the ceiling to the center of the connecting member (support column) of the surface-emitting light was approximately 500 mm. In Example 1, the distance from the ceiling to the highest point of the surface-emitting light was approximately 333 mm. In Example 2, the distance from the ceiling to the highest point of the surface-emitting light was approximately 152 mm.

[0083] Comparative Examples 1 and 2 In Comparative Example 1, a commercially available base light (KOIZUMI, XH52116) was installed on the ceiling. In Comparative Example 2, a commercially available downlight (ODELIC, XD703119BC) was installed in a recess in the ceiling.

[0084] [evaluation] A room with floor and ceiling dimensions of 4m in length and 4m in width, and a height of 3m was prepared, and the lighting for the example or comparative example was placed. The reflectivity of the materials for the ceiling, side walls, and floor is as follows. Ceiling: 70.0% Side walls (interior walls of the room): 54.6% Floor: 10.3%

[0085] A desk was placed on the floor below the lights. Since each light had a different luminous flux and power consumption, the number of lights was adjusted and the brightness was dimmed so that the total power consumption was the same.

[0086] The average illuminance on the desk was determined by simulation. Additionally, a 360° image was acquired from an observation position (a position offering a panoramic view of the room), and the perceived brightness of the space was evaluated within an angular range where both the elevation and depression angles were 40° (80° total). The observation position was one of the four corners of the room, at a height of 160cm from the floor. REALAPS® was used as the evaluation software. A higher perceived brightness value indicates a brighter room when viewed from above. Furthermore, the design aesthetics of the lighting were evaluated as follows: B for conventional, general design, and A for distinctive shape or light emission, demonstrating superior design aesthetics.

[0087] The evaluation conditions and results are shown in Table 1.

[0088] [Table 1]

[0089] As shown in Table 1, the embodiment exhibits superior brightness (first impression) when viewing the room from above compared to the comparative example. Furthermore, the embodiment also shows higher average illuminance on the desk. Therefore, the entire room appears brighter in the embodiment compared to the comparative example. In addition, the embodiment also demonstrates superior lighting design. [Industrial applicability]

[0090] The surface-emitting lighting of this disclosure is suitable for use as indoor lighting when placed in a room with a ceiling, side walls, and floor. It may also be used in spaces where part of the room is open. However, the applications of surface-emitting lighting are not limited to these cases and can be used for a variety of purposes. [Explanation of Symbols]

[0091] 10A, 10B: Surface-emitting illumination 11, 111: First-face light emitter 12, 112: Second-face light emitter 13: Third-faced light emitter 14: Fourth-faced light emitter 15: Connecting component M1: First main surface M2: 2nd main surface E1: 1st end face E2: 2nd end face H1, H2: Floor and horizontal plane θ1: The acute angle formed between the first-face light-emitting element and the floor (a plane horizontal to the floor). θ2: The acute angle formed between the second surface light-emitting body and the floor (a plane horizontal to the floor). θ3: The acute angle formed between the third-faced light-emitting body and the floor (the plane horizontal to the floor). θ4: The acute angle formed between the fourth-face light-emitting element and the floor (the plane horizontal to the floor). 10: Light guide layer (light guide plate) 60A: Directional change layer 30: Base material layer 40A, 40B: Hard coat layer and / or anti-reflective layer 52, 54, 55, 56, 58: Adhesive layer or tack layer 62A: Shaping film 64A: Internal space (air cavity), recess 100A: Surface-emitting element 100A(G): Light guide member for surface-emitting device ISa: First Inclined Surface ISb: 2nd slope LRa: First Light LRb: The second light LS:Light source

Claims

1. The floor and, Side walls and, The ceiling and A room equipped with surface-emitting lighting, The aforementioned surface-emitting illumination comprises one or more surface-emitting elements, The surface light emitter comprises a first main surface, a second main surface opposite to the first main surface, and a plurality of end surfaces connecting the first main surface and the second main surface. Each of the aforementioned end faces comprises at least a first end face and a second end face opposite to the first end face. At least the first main surface and the first end surface are light-emitting surfaces, A room in which the acute angle between the first main surface and the floor is greater than 0 degrees and less than or equal to 90 degrees.

2. The room according to claim 1, wherein the first main surface faces at least one of the floor side and the side wall side.

3. The aforementioned surface-emitting illumination comprises a first surface-emitting element and a second surface-emitting element. The second end face of the first surface light-emitting body and the second end face of the second surface light-emitting body are adjacent to each other. The room according to claim 1 or 2, wherein the directions of the acute angles between the first main surfaces of the first surface light-emitting body and the floor are opposite to each other and are between 15 degrees and 85 degrees.

4. The aforementioned surface-emitting illumination further comprises a third surface-emitting element and a fourth surface-emitting element. The second end face of the third-faced light-emitting body and the second end face of the fourth-faced light-emitting body are adjacent to each other. The room according to claim 3, wherein the directions of the acute angles between the first main surfaces of the third surface light-emitting body and the floor are opposite to each other and are between 15 degrees and 85 degrees.

5. Each of the first surface light emitter, the second surface light emitter, the third surface light emitter, and the fourth surface light emitter is provided with a light source on the second end face side. The room according to claim 4, wherein all of the first end faces of the surface-emitting light source face outward.

6. The acute angle between the first main surface of the first surface-emitting body and the second surface-emitting body and the floor is between 15 degrees and 50 degrees, and the first end surfaces of the first surface-emitting body and the second surface-emitting body face the ceiling. The room according to claim 5, wherein the acute angle between the first main surface of each of the third surface light-emitting body and the fourth surface light-emitting body and the floor is greater than 50 degrees and less than or equal to 85 degrees, and the first end surface of each of the third surface light-emitting body and the fourth surface light-emitting body faces the floor.

7. The first main surface of the first surface light-emitting body and the second surface light-emitting body each face the floor side, The room according to claim 6, wherein the first main surfaces of the third surface light-emitting body and the fourth surface light-emitting body each face the side wall.

8. The acute angle between the first main surface of the first surface-emitting body and the floor is greater than 50 degrees and less than or equal to 85 degrees, and the first end surfaces of the first surface-emitting body and the second surface-emitting body face the ceiling. The room according to claim 5, wherein the acute angle between the first main surface of each of the third-surface light-emitting body and the fourth-surface light-emitting body and the floor is 15 degrees or more and 50 degrees or less, and the first end surface of each of the third-surface light-emitting body and the fourth-surface light-emitting body faces the floor.

9. The first main surface of the first surface light-emitting body and the second surface light-emitting body each face the side wall side, The room according to claim 8, wherein the first main surfaces of the third surface light-emitting body and the fourth surface light-emitting body each face the floor.

10. The room according to claim 1 or 2, wherein the surface-emitting lighting is positioned at a distance from the ceiling and the side walls.

11. The room according to claim 10, wherein the surface-emitting light is located on the ceiling side, in the center of the space enclosed by the side walls and in its vicinity.

12. The surface light-emitting body is attached to the side wall with the second main surface facing the side wall. The first end face illuminates the ceiling, The room according to claim 1, wherein the first main surface illuminates the inside of the room.

13. The surface light emitter is provided with a light source on the second end face side and includes a light extraction layer with an air cavity, The room according to any one of claims 1, 2, and 11, wherein light from the light source is refracted in the air cavity and emitted from the first main surface.

14. A surface-emitting light fixture placed in a room having a floor, side walls, and a ceiling, The aforementioned surface-emitting illumination comprises one or more surface-emitting elements, The surface light emitter comprises a first main surface, a second main surface opposite to the first main surface, and a plurality of end surfaces connecting the first main surface and the second main surface. Each of the aforementioned end faces comprises at least a first end face and a second end face opposite to the first end face. At least the first main surface and the first end surface are light-emitting surfaces, A surface-emitting light source wherein the acute angle between the first main surface and the floor is greater than 0 degrees and less than or equal to 90 degrees.

15. The surface-emitting illumination according to claim 14, wherein the first main surface faces at least one of the floor side and the side wall side.

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