JPH10282911A - Surface emitting unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable uniform light emission over a wide area, to reduce the number of LEDs as a light source, and to increase the mechanical strength of a light emitting surface to form a surface light emitting unit for a road surface. Enable to use. SOLUTION: A surface light emitter 2 is mounted on an inner bottom surface of a base chassis 1 formed in a flat shallow dish shape through a reflection sheet 5, and a diffusion sheet is provided on the surface light emitter 2. The transparent cover 3 is closely covered with the filter sheet 6 via the filter sheet 7. The external force applied to the cover 3 can be received by the base chassis 1 through these close portions, thereby preventing the cover 3 and the surface light emitter 2 from being damaged and increasing the surface strength. Further, since the surface light emitter 2 has an edge light structure in which the light guide plate 4 and an LED as a light source are arranged at the end thereof, a small number of LEDs are used.
Thus, uniform surface light emission can be realized, and manufacturing at low cost can be realized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light emitting unit used in a state of being buried on a road surface or a wall surface, and more particularly to a surface light emitting unit having a flat light emitting surface and high surface strength.

[0002]

2. Description of the Related Art In recent years, as one of markers for displaying lane markings provided on a roadway, a sidewalk, or the like, a surface-emitting unit which emits light by burying it in a road surface has been proposed. Is increasing. In such a surface light emitting unit, a required light emitting area is required.
There is a uniform light emitting type in which light emitting diodes (LEDs) used as light sources are arranged in a plane along a required light emitting surface, and a diffusion plate is arranged above the light emitting diodes (LEDs). Alternatively, a point group light emission type in which a plurality of LEDs are combined with a lens to emit light in a point-like manner and arranged in a plane has been proposed. Then, these light emitting units are formed so as to have the same standard as the road surface block constituting the road surface, and the road surface is formed by combining the road surface block with the road surface block to emit light on the road surface area where the light emitting unit is arranged. It is configured as follows.

[0003]

In such a conventional surface light-emitting unit, the former uniform light-emitting unit diffuses light emitted from LEDs arranged in a plane by a diffusion plate. Since the light emitting area of the LED is limited, in order to satisfy the required light emitting area, the number of required LEDs increases, which causes an increase in cost. Further, the latter point-group light-emitting type has a configuration in which point-like light-emitting members are assembled, so that the recognition effect by light emission is low, and there is a problem in its effectiveness. In this regard, the former uniform light emitting type is effective. However, in order to make the light emitting surface uniform and to make the entire surface a light emitting region, a support structure for supporting the light emitting surface is provided between the LEDs in the light emitting region. Therefore, there is a problem with respect to the withstand strength when a load is applied to the light emitting surface, that is, the surface strength.

It is an object of the present invention to reduce uniform light emission by a small number of L
It is an object of the present invention to provide a surface emitting unit having an increased surface strength while realizing the ED to reduce the cost.

[0005]

A surface light emitting unit according to the present invention comprises a base member formed in a flat shallow dish shape, a surface light emitter mounted on the inner bottom surface of the base member, and the surface light emitter. A transparent cover member attached to an upper surface opening of the base member so as to cover the base member. The base member has a recess for allowing a cord connected to the surface light emitting body to pass through the inner bottom surface thereof. A groove is formed, and the inner bottom surface of the base member excluding the concave groove and the back surface of the surface light emitter, and the surface of the surface light emitter and the inner surface of the cover member are each in close contact with each other. .

Here, in the present invention, the following forms are preferable. A sheet member is provided between the surface of the surface light emitter and the inner surface of the cover member to transmit light emitted from the surface light emitter with required characteristics. Further, the surface light emitter has a light guide plate having a reflection part for transmitting light inside and reflecting a part of the transmitted light toward the surface, and the light guide plate provided at an end of the light guide plate. And a light source for emitting light into the plate. Further, a concrete block is integrated with the base member, and its outer shape is formed to the same standard as a block for forming a road surface.

[0007]

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an external view of an example in which the present invention is applied to a surface light emitting unit for burying a road surface, as viewed from below. FIG. 2 is a sectional view of the surface light emitting unit 100 taken along the line AA, and FIG. . The base chassis 1 is formed in a rectangular shallow dish shape, and has a cord insertion hole 11 formed in the center of the bottom surface thereof, and has a lengthwise direction within a width dimension including the code insertion hole 1. Along the groove 12
Are formed as cord insertion grooves. Further, a circular cylindrical cord insertion pipe 13 is formed so as to protrude from an outer surface of the bottom surface connected to the cord insertion hole 12. On the bottom surface of the base chassis 1, a surface light emitting body 2 formed in a rectangular shape is provided, and light source cords connected to both ends in the length direction of the surface light emitting body 2 and to a central portion in the width direction. 21 passes through the cord insertion groove 12 and further passes through the cord insertion hole 11 in a state where the waterproof property is secured by the rubber bush 23.
3 has been pulled out. This light source code 21
The light source connector 22 is connected to a tip of the power supply connector 404, and can be connected to a power supply connector 404 on the power supply side described later. Further, an upper surface of the base chassis 1 is covered with a light-transmissive cover 3 and is fixed in a sealed state at a peripheral portion 31 thereof. In this embodiment, a fitting groove 14 is formed in the peripheral edge of the base chassis 1 in the circumferential direction,
Further, the peripheral portion 31 of the cover is formed as a circumferential ridge, and the peripheral portion 31 is fitted into the fitting groove 14 and adhered by an adhesive (not shown).

FIG. 4 is a partially exploded perspective view of the surface light emitter 2. The light guide plate 4 is formed of a transparent plate member having a rectangular shape similar to the base shart 1 and having light transmissivity. Both ends in the length direction are formed to be thick, and the surfaces of these ends are formed. Substrate storage grooves 41 are formed on the sides along the width direction, and the LED substrates 42 are stored respectively. These LED boards 42 are separated into narrow strips, and a plurality of chip-type LEDs 43 are mounted on the board in an array state. Light plate 4
And the storage groove 41
It is fixedly supported by a transparent adhesive that does not appear in the figure filled therein. Note that the light source code 21 is
It is drawn from the D substrate 42. Further, the light guide plate 4 is formed with a fine reflection concave portion 44 having a tapered cross section for reflecting light guided in the light guide plate 4 toward the front surface side. The recesses 44 are formed with low density on both ends close to the LED substrate 42 and with high density on the center side. On the back surface of the light guide plate 4, a reflection sheet 5 made of a thin resin sheet having a high light reflectance is attached in close contact. On the front side of the light guide plate 4, a milky white diffusion sheet 6 and a filter sheet 7 of a color corresponding to the emission color are laminated, and interposed between the surface of the light guide plate 4 and the cover 3. Have been. At this time, the diffusion sheet 6 and the filter sheet 7 have respective thicknesses so that a gap in the thickness direction does not occur between the surface of the front light guide plate 4 and the inner surface of the cover 3. Is set.

In the surface light emitting unit 100 having this configuration, when the LED board 42 is energized through the light source cord 21, the LEDs 43 of each LED board emit light, and this light is emitted to the side surfaces of the storage grooves 41 at both ends of the light guide plate 4. The light is guided into the light guide plate 4 from the facing end face. Then, while being transmitted through the light guide plate 4, the light is reflected to the front surface side in the reflection concave portion 44. As described above, the reflection concave portion 4 has the LE at both ends.
The density is higher at the center where the amount of light from D is reduced,
Since the reflection ratio is increased, a uniform amount of reflected light can be obtained for the entire light guide plate 4. Also, the light guide plate 4
The light leaked to the back side of the light guide plate 4 is reflected by the reflection sheet 5 and directed to the front side of the light guide plate 4. And
The light emitted from the surface of the light guide plate 4 is diffused by the diffusion plate 6 to be further uniformized, and is converted into a predetermined color light in the filter sheet 7 and emitted to the outside through the cover 3. Become. Thereby, uniform light emission can be obtained on the entire surface of the cover 3.

An example in which the surface light-emitting unit 100 is configured as a road surface block to be embedded in a road surface of a road is shown in a partially broken perspective view of FIG. In the figure, the surface light-emitting unit 100 is housed in a concave portion 81 formed on the upper surface of a concrete block 8 having a predetermined external dimension,
The surface emitting block 200 is integrally fixed to the concrete block 8 by an adhesive. At this time, the cord insertion pipe 13 on the back of the surface light emitting unit 100 is
It is exposed downward through an opening 82 provided on the bottom surface of the concave portion 81. In addition, such a surface emitting block 2
A normal road block 300 other than 00 has the same outer dimensions as the concrete block 8 and is entirely made of concrete. Then, as shown in FIG. 6, when a road surface is formed by these blocks 200 and 300, a wiring pipe 401 is laid on a ground layer 400 on the road surface,
A power cord 402 is extended inside the wiring pipe 401,
In addition, at the position where the light-emitting block 200 is provided,
03, and the power cord 4
02 is connected to the power supply connector 404.
Then, the road surface block 3 is placed on the wiring pipe 401.
00 and the surface light-emitting block 200 are arranged in a plane, and concrete 500 is poured between the blocks to be integrated. At this time, when the surface light-emitting block 200 is arranged, the light source connector 22 of the surface light-emitting unit 100 is fitted to the power supply connector 404 to connect them,
The cord insertion pipe 13 of the surface light emitting unit 100 is fitted into the opening cylindrical portion 403 of the wiring pipe 401, and a seal inside the pipe is secured by a sealant (not shown).

On the road surface constructed in this manner, the power cord 402 connects to the power connector 404 and the light source connector 2.
2. Power is supplied to the surface light-emitting unit 100 of the light-emitting block 200 through the light source cord 21 to cause the surface light-emitting body 2 provided therein to emit light, so that the surface of the surface light-emitting block 200 emits light in a planar manner. Will be. Therefore, if the surface light-emitting blocks 200 are arranged linearly on a road surface, for example, linear light emission can be performed on the road surface. It is possible to perform light emission on the surface. When the surface light-emitting block is disposed on the road surface as described above, the load of the person or the vehicle is reduced by the cover 3 of the surface light-emitting unit 100.
, The back surface of the cover 3 is in close contact with the light guide plate 4 via the filter sheet 7 and the diffusion sheet 6, and the light guide plate 4 has a base on the back surface via the reflective sheet 5. Since the load is closely attached to the bottom surface of the chassis 1, the load described above is directly transmitted to the base chassis 1 via the close structure of each sheet, and can be received by the base chassis 1. In addition, a part of the load is alleviated by its cushioning action based on the deformation of the thickness of each of the sheets 5, 6, and 7. Further, LED substrates 42 are provided at both ends of the surface light emitter 2.
Is alleviated by the transparent adhesive used for embedding in the storage groove 41 of the light guide plate 4. As a result, the entire surface light-emitting unit 100 eventually receives the above-described load on the base chassis 1, and its surface strength can be increased.

In addition, by using a so-called edge light configuration comprising the light guide plate and the LED as in the above embodiment as the surface light emitter, even if the light emission area is large, a smaller number of LEDs can be used uniformly. Further, it is possible to realize high-luminance surface light emission, which is advantageous in realizing cost reduction. If a hard material such as hard resin or tempered glass is used for the cover, it is possible to obtain higher strength as a road surface block.

[0013]

As described above, according to the present invention, the surface light emitter is mounted on the inner bottom surface of the base member formed in a flat shallow dish shape in close contact therewith, and the surface light emitter is mounted on the surface light emitter. Since the transparent cover member is covered in close contact with the cover member, the external force applied to the cover member can be received by the base member through these close portions, preventing damage to the cover member and the surface light emitter. Thus, a surface light-emitting unit having an increased surface strength can be obtained. In addition, since a light guide plate and an edge light in which an LED as a light source is arranged at an end of the light guide plate are used as the surface light emitter, a small number of L's are used.
Uniform surface light emission can be realized by ED, and manufacturing at low cost can be realized.

[Brief description of the drawings]

FIG. 1 is an external view of one embodiment of a surface emitting unit of the present invention as viewed from below.

FIG. 2 is a sectional view taken along line AA in FIG.

FIG. 3 is a partially exploded perspective view of the surface light emitting unit of FIG.

FIG. 4 is a partially exploded perspective view of the surface light emitter.

FIG. 5 is a partially cutaway perspective view showing a state in which a surface emitting block is formed by the surface emitting unit of the present invention.

6 is a cross-sectional view showing a state where a road surface is formed by the surface light-emitting block of FIG. 5 and another road surface block.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Base chassis 2 Surface light-emitting body 3 Cover 4 Light guide plate 5 Reflection sheet 6 Diffusion sheet 7 Filter sheet 100 Surface light-emitting unit 200 Surface light-emitting block 300 Road surface block 400 Base layer

Claims (4)

[Claims] 1. A base member formed in a flat shallow dish shape, a surface light emitter mounted on an inner bottom surface of the base member, and an upper surface opening of the base member covered by the surface light emitter. A transparent cover member to be attached to the base member, wherein the base member has a concave groove formed in the inner bottom surface for inserting a cord connected to the surface light emitter, and the base member excluding the concave groove. The inner bottom surface and the back surface of the surface light emitter,
A surface light emitting unit, wherein a surface of the surface light emitter and an inner surface of the cover member are in close contact with each other. 2. The surface light emitting device according to claim 1, wherein a sheet member that transmits light emitted from the surface light emitting device with required characteristics is disposed between a surface of the surface light emitting member and an inner surface of the cover member. unit. 3. A light guide plate having a reflecting portion for transmitting light therein and reflecting a part of the transmitted light toward the surface, and provided at an end of the light guide plate. The surface light emitting unit according to claim 1, wherein the light emitting plate includes a light source that inputs light into the light guide plate. 4. The surface light emitting unit according to claim 1, wherein a concrete block is integrated with the base member, and an outer shape thereof is formed to the same standard as a block for forming a road surface.