JP7066992B2 - Surface light emitting device and indoor structure using it - Google Patents

Description

The embodiment of the present disclosure relates to a surface light emitting device or the like used for producing a spatial atmosphere.

As a method of producing the atmosphere of a space, a technique of using indirect lighting that illuminates with indirect light from a light source is widely known. For example, in Patent Document 1, a lighting system capable of emphasizing the expanse of a space by irradiating light from a light source that is hidden and cannot be directly seen toward a wall or ceiling that divides the space instead of the space. Is disclosed.

Japanese Unexamined Patent Publication No. 2011-210594

However, in the lighting system disclosed in Patent Document 1, since the unit accommodating the light source protrudes into the space, there is no sense of unity with the surroundings, and the presence of the light source is present even if the light source is not directly visible. Easy to be aware of. For this reason, there is a problem that the atmosphere of the space cannot be effectively produced.

Further, for example, when LED lighting is used, the light does not spread as compared with an incandescent light bulb, so that it is difficult for the light to reach the corner of the room. Even if fluorescent lamps are evenly arranged on the ceiling, light and dark can be created at the corners.

An object of the present invention is to provide a surface light emitting device capable of effectively producing an atmosphere of a space and simplifying a structure.

In addition, the purpose is to brighten the corners, make the size of the room feel wider than it actually is, and improve the feeling of brightness.

According to one aspect of the present invention, it is a surface light emitting device having a light emitting surface, the first light guide plate and the second light guide plate arranged in a direction intersecting each other, the first light guide plate, and the first light guide plate. A surface light emitting device including a light source unit that emits light to the light guide plate (2) is provided.

It is preferable that the side end portion of the first light guide plate and the side end portion of the second light guide plate are close to each other, and the light source portion is arranged at the close end portion.

It is preferable that the light source portion is provided on the upper end side of the close end portion.

Between the light source unit and the first light guide plate and the second light guide plate, the light emitted from the light source unit is directed to the incident end surface of the first light source plate and the incident end surface of the second light guide plate. A light source dividing element for distributing light to and may be provided.

It is preferable that the light source portion is arranged along the upper end portions of the first light guide plate and the second light guide plate.

Further, the light source unit may be arranged along the upper end portions of the first light guide plate and the second light guide plate.

It is preferable that the emission intensity of the light source portion is changed depending on the position.

Further, it is preferable that a transmittance adjusting film is provided on the light emitting surface side of the light guide plate.

The first light guide plate and the second light guide plate may be integrated at a corner.

The present invention is an indoor structure in which the surface light emitting device according to any one of the above is arranged in a corner portion of the room.

According to the present disclosure, the atmosphere of the space can be effectively produced and the structure can be simplified. Further, according to the present disclosure, the corner portion can be brightened by using the surface light emitting device. As a result, the size of the room can be made to feel wider than it actually is, and the feeling of brightness can be improved.

It is a figure which shows an example of the space which attached the surface light emitting device by embodiment of this invention. It is a figure which shows an example of the mounting structure of a surface light emitting device to a wall, and is the sectional view along the normal direction of a wall. It is a figure which shows the detailed structure of a surface light emitting device, and is the sectional view along the normal direction of a wall. It is a perspective view which shows the whole structure example of the surface light emitting device by this embodiment. In the surface light emitting device shown in FIG. 4, it is a figure which shows the state of changing the gradation of the emitted light which depends on the arrangement of the light source part. It is a surface light emitting device that utilizes the position dependence of the light emitting intensity of the light source unit. It is a perspective view (a) and a sectional view (b) which show the structure which provided the transmittance adjusting film on the light emitting surface side of a light guide plate. It is a figure which shows an example of the surface light emitting device which used the light flux dividing element. It is a figure which shows one configuration example of the surface light emitting device by 2nd Embodiment of this invention, and is the figure which showed only the light guide plate and the light source part for simplicity. It is a figure which shows the modification of FIG.

Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. In the description of the drawings, the same elements are designated by the same reference numerals, and duplicate description will be omitted. Further, in the drawings attached to the present specification, the scale and the aspect ratios are appropriately changed from those of the actual ones and exaggerated for the convenience of illustration and comprehension.

In addition, terms such as "parallel", "orthogonal", and "same" that specify shapes, geometric conditions, and their degrees as used herein are not bound by strict meaning. The interpretation shall include the range in which similar functions can be expected. "Orthogonal" includes the case of crossing at an angle different from 90 degrees.

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

(First Embodiment)
FIG. 1 is a diagram showing an example in which a surface light emitting device according to the first embodiment of the present invention is arranged in an indoor space. FIG. 2 is a diagram showing an example of a wall-mounted structure of the surface light emitting device, and is a cross-sectional view taken along the normal direction of the wall.

As shown in FIGS. 1 and 2, the surface light emitting device 11 according to the present embodiment is a wall portion 2a, 2b, 2c of the room A, and is arranged below the ceiling 1. The wall portion referred to here includes a partition or the like that partitions the space.

The surface light emitting device 11 is arranged, for example, on the wall portion 2 so that the surface of the wall portion and the surface of the surface light emitting device are in contact with each other. Then, it is arranged along the surface of the wall portions 2a, 2b, 2c from the boundary between the ceiling 1 and the wall portions 2a, 2b, 2c. In FIG. 2, the surface light emitting device 11 is arranged so as to be accommodated in the accommodating portion formed on the wall portion, but the structure may be such that there is no accommodating portion.

FIG. 3 is a diagram showing a detailed structure of the surface light emitting device, and is a cross-sectional view taken along the normal direction of the wall. As shown in FIG. 3, the surface light emitting device 11 includes a light guide plate 21, a reflector 25 arranged on the back side of the light guide plate 21, and an edge light arranged at an end of the light guide plate 21, such as an LED. It has a light source unit 23 and a diffuser plate 27 arranged on the front side of the light guide plate 21. A decorative sheet 31 may be arranged on the emission side of the diffuser plate 27. By providing the concavo-convex processed portion 21x on the back surface of the light guide plate 21, the emission efficiency can be improved.

A light emitting diode (LED), a cold cathode fluorescent lamp, an incandescent light bulb, a laser oscillating device, or the like can be used for the light source unit 23, but an LED is used in the present embodiment from the viewpoint of facilitating the miniaturization of the entire device. ing.

The light guide plate 21 is a rectangular thin plate, and has a pair of main surfaces facing each other and four side surfaces defined between the pair of main surfaces. The light guide plate 21 is arranged below the light source unit 23 so that the light from the light source unit 23 is incident on the side surface. The structures and materials of the light guide plate 21, the reflector 25, and the diffuser plate 27 are already well known, and detailed description thereof will be omitted.

Hereinafter, the surface light emitting device according to the present embodiment will be described with reference to an arrangement example of the light source and the light guide plate. Description and illustration of other components will be omitted.

FIG. 4 is a perspective view showing an overall configuration example of the surface light emitting device according to the present embodiment. As shown in FIG. 4, the surface light emitting device 11 according to the present embodiment has a first light guide plate 21a and a second light guide plate 21b, each of which has a first light guide plate 21a and a second light guide plate 21b whose ends are close to each other and arranged in a direction orthogonal to each other. It is composed of a surface light emitting device 11a and a second surface light emitting device 11b. One light source unit 23 is arranged in the vicinity of the close end portions of the first light guide plate 21a and the second light guide plate 21b. By arranging one light source unit 23 at the corners of the first light guide plate 21a and the second light guide plate 21b, the light from the light source unit 23 is directed to the first light guide plate 21a and the second light guide plate 21b. The emitted light is incident on the first light guide plate 21a and the second light guide plate 21b and guided in two directions, and the emitted light is guided in two directions to the first light emitting surface 51x and the second light emitting surface 51x of the first light guide plate 21a. Light can be surface-emitted from the second light emitting surface 51y of the light guide plate 21b.

With such a configuration, the light source unit 23 may be provided at one location in the corner portion, and the light can be efficiently used by one light source unit 23.

Hereinafter, the surface light emitting device according to the present embodiment will be described more specifically.

(1) Formation of Gradation Depending on the Arrangement Position of the Light Source Unit FIG. 5 is a diagram showing how the surface light emitting device shown in FIG. 4 changes the gradation of the emitted light depending on the arrangement of the light source unit. Hereinafter, the first light guide plate 21a and the second light guide plate 21b may be collectively referred to as a light guide plate 21.

In FIG. 5A, a plurality of light source portions 23a, 23a, ... Are provided in the vicinity of the upper end surfaces of the first light guide plate 21a and the second light guide plate 21b at certain intervals. According to this structure, the brightness of the light emitting surface 51a gradually decreases as the distance from the upper end surface of the light guide plate 21 increases, and the non-light emitting surface 51b becomes a distance from the upper end surface of the light guide plate 21 by a certain distance or more. In this structure, the luminance distribution in the light emitting surface of the light guide plate 21 has a linear shape with respect to the upper end surface.

In FIG. 5B, a light source unit 23b is provided along the close end faces of the first light guide plate 21a and the second light guide plate 21b. According to this structure, the brightness of the light emitting surface 53a gradually decreases as the distance from the close end surface of the light guide plate 21 increases, and the non-light emitting surface 53b becomes a distance from the close end surface of the light guide plate 21 by a certain distance or more. In this structure, the luminance distribution in the light emitting surface of the light guide plate 21 has a linear shape with respect to the close end surface.

In FIG. 5C, a light source unit 23c is provided on the upper portion of the close end faces of the first light guide plate 21a and the second light guide plate 21b. According to this structure, the brightness of the light emitting surface 55a gradually decreases as the distance from the light source unit 23c increases, and the non-light emitting surface 55b becomes the distance from the light source unit 23c by a certain distance or more. In this structure, the luminance distribution in the light emitting surface of the light guide plate 21 has a concentric shape centered on the light source portion 23c.

FIG. 5 (d) is a combination of the structures of the light source unit of FIGS. 5 (a) and 5 (c). That is, it has a light source unit 23a and a light source unit 23c. According to this structure, the brightness on the light emitting surface 57a gradually decreases as the distance from the upper end surface of the light guide plate 21 increases, and the brightness on the light emitting surface 57a gradually decreases as the distance from the light source unit 23c increases. Then, when the distance from the upper end surface of the light guide plate 21 is a certain distance or more, the non-light emitting surface 57b is formed. In this structure, the luminance distribution in the light emitting surface of the light guide plate 21 has a concentric shape centered on the light source portion 23c in the region near the close end face of the light guide plate 21, and in the region far from the close end face of the light guide plate 21. , It becomes a linear shape with respect to the upper end surface.

FIG. 5 (e) is a combination of the structures of FIGS. 5 (a) and 5 (b). That is, it has a light source unit 23a and a light source unit 23b. According to this structure, the brightness on the light emitting surface 59a gradually decreases as the distance from the upper end surface of the light guide plate 21 increases, and the brightness on the light emitting surface 59a gradually decreases as the distance from the light source unit 23b increases. Then, when the distance from the upper end surface of the light guide plate 21 is a certain distance or more, the non-light emitting surface 59b is formed. In this structure, the luminance distribution in the light emitting surface of the light guide plate 21 has a linear shape with respect to the close end face in the region close to the close end faces of the light guide plates 21a and 21b, and is far from the close end face of the light guide plate 21. The region has a linear shape with respect to the upper end surface.

As described above, when the surface light emitting device according to the present embodiment is used, a gradation is provided in two directions of the light emitting surface in the vertical direction and the horizontal direction based on the light emitting brightness depending on the position of the light source unit. The boundary with the wall surface connected to the surface light emitting device can be made inconspicuous. Further, by adjusting the position of the light source unit, it is possible to give a desired gradation to the light emitting surface.

Further, by using the surface light emitting device, the corner portion can be brightened. As a result, the size of the room can be made to feel wider than it actually is, and the feeling of brightness can be improved.

In addition, in FIG. 5, when it is installed on the wall, it has a symmetry as lighting, that is, a case where the luminance distribution is the same in both panels has been described, but the luminance distribution should be asymmetrical in both panels. You can do it.

Further, the intersecting panels may be made to intersect the ceiling and the wall, and the wall and the floor, other than the case where the wall and the wall intersect.

Further, the corner may be an inside corner shown in FIG. 5 or the like, or may be an outside corner. It should be noted that the inside corner tends to be darker than the outside corner, and the effect can be easily obtained.

(2) Formation of Gradation Dependent on Light Emission Intensity from Light Source Unit FIG. 6 is a surface light emitting device utilizing the position dependence of the light emission intensity of the light source unit. The arrangement of the light guide plates is the same as in FIGS. 4 and 5.

In the structure shown in FIG. 6, a plurality of light source portions 123a, 125a, 127a, ... Are provided in the vicinity of the upper end surfaces of the first light guide plate 21a and the second light guide plate 21b at certain intervals. Further, light source portions 123b, 125b, 127b, ... Are provided along the close end faces of the first light guide plate 21a and the second light guide plate 21b. In the structure shown in FIG. 6, the brightness, for example, the LED density decreases in the order of the light source units 123a, 125a, 127a, ..., And the brightness, for example, the LED density decreases in the order of the light source units 123b, 125b, 127b, ... ing.

Therefore, similar to the structure of FIG. 5C, in this structure as well, the brightness on the light emitting surface 55a gradually decreases as the distance from the light source portions 123a and 123b increases. According to this structure, the brightness of the light emitting surface 55a gradually decreases as the distance from the light source units 123a and 123b increases, and the non-light emitting surface 55b becomes when the distance from the light source units 123a and 123b is longer than a certain distance. Also in this structure, the luminance distribution in the light emitting surface of the light guide plate 21 has a concentric shape centered on the light source portions 123a and 123b. For example, the region 131a on the light source 123a, 123b side of the boundary line indicated by the reference numeral L11, the region 131b between the boundary line and the boundary line L11 indicated by the reference numeral L12, and the boundary line and the boundary line L12 indicated by the reference numeral L13. It has a region 131c between the two and a region 131d outside the region 131c.

As shown in FIG. 6, by changing the relationship between the position where the light source portion is arranged and the emission intensity thereof, it is possible to form a gradation having a desired shape in the light emitting portion.

(3) Formation of Gradation by Transmittance Adjusting Film FIG. 7 is a perspective view and a cross-sectional view showing a structure in which transmittance adjusting films 141a and 141b, for example, a halftone dot film, are provided on the light emitting surface side of the light guide plate 21. The transmittance adjusting film 141 adjusts the brightness of the surface emission from the light guide plate 21 by, for example, the density of black dots provided in the surface of the transmittance adjusting film 141. For example, the density of black dots is increased with L21, L22, and L23 as boundaries.

According to such a configuration, by providing the light source uniformly on the back surface side of the light guide plate 21, even if the surface emission intensity from the light guide plate 21 is uniform in the plane, it is provided in the plane of the transmittance adjusting film 141. Due to the density of the black dots, the higher the dot density, the lower the emission brightness, so that a desired gradation can be obtained. For example, in the structure shown in FIG. 7, a concentric circle whose brightness decreases in the direction from P ₁ to P ₂ with the upper part of the near end faces of the first light guide plate 21a and the second light guide plate 21b as the center of the concentric circle. Gradations can also be formed. This structure has an advantage that a gradation can be formed basically without depending on the arrangement of the light source unit.

(4) Utilization of Luminous Flux Dividing Element FIG. 8 describes a surface light emitting device using a luminous flux dividing element. In the surface light emitting device 11 shown in FIG. 8, the light source substrate 26 is arranged at the close end portions of the first light guide plate 21a and the second light guide plate 21b arranged so that the ends are close to each other and orthogonal to each other. On the light source substrate 26, a plurality of light source units 23 are provided, for example, in a direction along the close end portions when arranged at the close end portions of the first light guide plate 21a and the second light guide plate 21b. .. Further, a luminous flux dividing element, for example, a prism array 161 is provided between the light source substrate 26 and the close end portions of the first light guide plate 21a and the second light guide plate 21b. The prism array 161 exhibits a special optical effect by arranging fine prisms 165 on a transparent substrate 163. In this case, light incident on the prism array 161 incident on the opposite side of the transparent substrate 163. L31 can be divided into optics L35 and L37 in two orthogonal directions. By incident the light L35 and L37 in two orthogonal directions on the end faces of the first light guide plate 21a and the second light guide plate 21b, the light from one light source unit 23 is efficiently distributed and the first guide is performed. It can be incident on the light plate 21a and the second light guide plate 21b.

(Second embodiment)
FIG. 9 is a diagram showing a configuration example of a surface light emitting device according to a second embodiment of the present invention, and is a diagram showing only a light guide plate and a light source for simplicity. As shown in FIG. 9, the surface light emitting device according to the present embodiment has a single light source plate 221 composed of a first light source plate portion 221a and a second light guide plate portion _221b orthogonal to each other at the corner P31, and a guide plate. It has a light source unit 223 arranged on the upper end surface of the light plate 221. Other structures are the same as those described in the first embodiment.

The structure shown in FIG. 9 has an advantage that no gap is formed at the corner _P31 . Further, it is not necessary to align the light guide plates as compared with the case of using two light guide plates. Further, the strength of the surface light emitting device as a whole can be increased.

As shown in FIG. 10, it is a light guide plate 321 in which the first to third light guide plates 321a to 321a to c in which a plurality of light source units 323 are arranged are integrated, and has a plurality of corners P ₄₁ and P ₄₃ . It can also be applied to a structure having. Even in this case, the light emitting surface 331 and the non-light emitting surface 333 can be formed depending on the position of the light source unit 323.

In the above embodiment, the configuration and the like shown in the accompanying drawings are not limited to these, and can be appropriately changed within the range in which the effects of the present invention are exhibited. In addition, it can be appropriately modified and implemented as long as it does not deviate from the scope of the object of the present invention.

For example, the surface light emitting device of the present embodiment can be used as a building material panel. For example, the surface light emitting device can be an indoor structure arranged in a corner portion of the room.

In addition, each component of the present invention can be arbitrarily selected, and an invention having the selected configuration is also included in the present invention.

1 ... Ceiling 2a, 2b, 2c ... Wall 11 ... Surface light emitting device 21 ... Light guide plate 21a ... First light guide plate 21b ... Second light guide plate 23 ... Light source unit 27 ... Diffusing plate 51x ... First light emitting surface 51y ... Second light emitting surface 141 ... Transmittance adjustment film 161 ... Prism array 221, 321 ... Integrated light guide plate

Claims (4)

A surface light emitting device having a light emitting surface,
The first light guide plate and the second light guide plate arranged in the directions intersecting each other, and
It has a light source unit that emits light to the first light guide plate and the second light guide plate.
The light source unit is arranged along the upper end of each of the first light guide plate and the second light guide plate.
The light source unit has a light source in the vicinity of the upper end surfaces of the first light guide plate and the second light guide plate, and in the vicinity of the close end surfaces of the first light guide plate and the second light guide plate. death,
By changing the emission intensity of the light source portion depending on the position, a gradation of a desired shape on the light emitting surface is formed , and the brightness distribution in the light emitting surface becomes a concentric shape centered on the light source.
A surface light emitting device characterized by this. The surface light emitting device according to claim 1, further comprising providing a transmittance adjusting film on at least one of the first light guide plate and the second light guide plate on the light emitting surface side. The surface light emitting device according to any one of claims 1 to 2, wherein the first light guide plate and the second light guide plate are integrated at a corner. An indoor structure in which the surface light emitting device according to any one of claims 1 to 3 is arranged at a corner portion of the room.

Images