JPH0841832A - Internal illumination type road-sign board - Google Patents

Abstract

PURPOSE:To uniformly irradiate a road-sign board by a small number of fluorescent lamps, by providing an edge-light type light-guiding board at the inside of the road-sign board and a prismatic plate between the light-emitting side of the light-guiding board and a surface plate. CONSTITUTION:A process 4 for diffusing light is applied to the surface on the opposite side of the light-emitting surface of a light-guiding board 2 made of a transparent plastic, either by a method wherein a light-diffusing ink is printed so as to be distributed in various densities or by a method wherein irregularities are formed by sandblasting. A prismatic plate 7 is located on the side of the light-emitting surface of the light-guiding board 2, and on the outside thereof, a member formed by sticking a colored plate 6 on a white plate 5 is located. Furthermore, a reflecting plate 3 is located on the opposite side of the light-emitting surface and light sources 1 each are located on both sides of the light-guiding board 2. In this way, the light from the light sources 1 is guided into the light-guiding board 2 and is uniformly emitted by both the reflecting plate 3 and the printed or uneven surface by means of the process 4, through the prismatic plate 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an internally illuminated road marking plate having a lighting device inside. More specifically, the present invention relates to an internally illuminated road marking plate that uses a light guide type illumination device as an internal illumination system.

[0002]

2. Description of the Related Art Road signs are, as a rule, made of a reflective material or provided with a reflecting device or a night illumination device, as stipulated in Note 2 (2) of Appended Table 2 of the Sign Order. There are roughly two types of illuminating devices for signboards, an internal illuminating system and an external illuminating system. In general, the internal lighting system has a built-in light source inside the signboard. And its structure is
It consists of a plurality of fluorescent lamps as light sources, a white methacrylic plate and a green / blue methacrylic plate in front of the fluorescent lamp, and a surface plate on which letters and symbols to be displayed are formed.

[0003]

In order to emit light from the entire surface of the internal lighting type road marking plate, it is necessary to arrange many fluorescent lamps all over the inside, so that the number of the fluorescent lamps also becomes large.
As a result, the frequency of breakdowns increases and maintenance costs increase. Therefore, a road marking plate is provided that can uniformly irradiate even if the number of fluorescent lamps is small.

[0004]

DISCLOSURE OF THE INVENTION The present invention relates to an internal lighting type road marking plate having a light source built therein, wherein an edge light type light guiding plate is used as an internal lighting device, and This is an internally-illuminated road marking plate in which a prism plate is installed between the surface plate and the surface plate.

The edge light type light guide plate is a plate-like structure that guides light from an original light source installed at its end and emits light from one surface direction. So this is
It has already been proposed as a backlight for a liquid crystal display device of OA equipment.

Any material may be used as the material of the light guide plate used in the present invention as long as it is a transparent plastic, and among them, methacrylic resin, polystyrene resin, MS resin and polycarbonate resin are preferable. It is desirable that the end surface on which the light from the light source is incident is a mirror surface and that a surface other than the incident surface and the emission surface is provided with a reflecting material. The thickness of the light guide plate can be freely selected depending on the shape of the marking plate, but it is necessary to select the thickness of the plate according to the illuminance of light emitted from the light guide plate.

Various treatments and accessories are installed on the light guide plate in order to change the direction of the light incident from the end face by approximately 90 ° and to radiate the light uniformly from one face and the entire face.

As one example thereof, there is one in which a surface opposite to the light emitting surface is subjected to a light diffusion treatment, and a reflecting plate is further installed on the surface. The light diffusion treatment is a method of printing a light diffusion ink containing fine particles with various concentration distributions,
There is a method of making fine irregularities on the surface of the light guide plate by sandblasting or the like.

As still another example, there is one in which the light emitting surface of the light guide plate is provided with a light diffusing process by a concavo-convex process and a reflecting plate is installed on the side opposite to the light emitting surface. As this uneven processing,
For example, sandblasting.

The reflector installed on the light guide may be any one having a high light reflectance, such as a film or sheet deposited with silver or aluminum, a white plate containing a white pigment, or a white plate containing a white pigment. Examples include foamed sheets.

The original light source may be a commercially available straight tube or annular fluorescent lamp and is not particularly limited. That is, the size and the light output power may be selected according to the size of the light guide plate and the illuminance required by the sign plate.

The surface plate may be a standard plate. For example, a colored methacrylic plate with characters and symbols cut out is attached to a white methacrylic base plate, a colored methacrylic plate of a laminated plate of colored methacrylic plate and white methacrylic plate is cut, and a portion with the characters and symbols cut out is a white methacrylic plate. And the like, and those adhered to the back surface of the transparent methacryl base plate by screen-printing the content of the marking directly on the transparent methacryl base plate, or those adhered with a printed film.

A prism plate is installed between the exit surface side of the light guide plate and the surface plate, and the prism plate is a plate-like structure in which a large number of prisms are arranged. As a form of installation of the prism plate, there are one in which an independent prism plate is installed, one in which it is integrated with a surface plate, and one which also serves as a white methacrylic plate of the surface plate.

By means of the prism plate, the light emitted from the light exit plate of the light guide plate is prevented from protruding outside the range of the surface plate and concentrated in the direction of the visual field of the car driver, and the illuminance can be increased. .

The internal lighting device and the marking plate surface are strong,
It is set in a steel plate box in consideration of weather resistance, dust resistance, waterproofness, etc. to obtain an internally illuminated road marking plate.

[0016]

Embodiments of the present invention will now be described in detail with reference to the drawings.

In the marking plate shown in FIG. 1, the light from the original light source 1 enters the light guide main body 2, and more uniform light is passed through the prism plate 7 and the surface plate 5 by the reflection plate 3 and the light diffusion treatment 4. , 6 radiates light. The surface plate is composed of a white plate 5 and a colored plate 6. This is an example corresponding to claim 1.

In the sign board shown in FIG. 2, 1, 2, 3,
6 is the same as in FIG. 1, but the prism plate 7 is integrated with the coloring plate 6 also as a white methacrylic plate as a surface plate. This is an example corresponding to claim 2.

In the sign board shown in FIG. 3, 1, 2, 3,
6 is the same as FIG. 2, but instead of the light diffusion processing of 4, the light guide plate 2
The light-exiting side surface is subjected to a concave-convex process 8 which is a kind of light diffusion process. This is also an example corresponding to claim 2.

[0020]

As described above, according to the present invention,
Since the road marking plate uses the edge light type light guide plate system as the internal lighting device, it is possible to reduce the number of fluorescent tubes of the light source and provide an internally illuminated road marking plate with low maintenance costs. Moreover, the light emitted from the light source can be used more effectively to improve the illuminance.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment corresponding to claim 1 of the present invention.

FIG. 2 is a sectional view of an embodiment corresponding to claim 2 of the present invention.

FIG. 3 is a sectional view of another embodiment corresponding to claim 2 of the present invention.

[Explanation of symbols]

 1: Original light source 2: Light guide plate body 3: Reflector plate 4: Light diffusion treatment of light guide plate 5: White surface plate 6: Surface colored plate 7: Prism plate

Claims (2)

[Claims] 1. A road marking plate of an internal lighting system having a light source inside, wherein an edge light type light guide plate is used for an internal lighting device, and a prism plate is provided between an exit surface side of the light guide plate and the surface plate. An internally lit road marking board that has been installed. 2. The internally illuminated road marking plate according to claim 1, wherein the prism plate is integrated with a surface plate.