JPH05266706A - Surface emission type light source - Google Patents

Abstract

PURPOSE:To provide a light emitting surface on which colors are mixed evenly, by using a fluorescent lamp, of which brightness and light emission color can be changed. CONSTITUTION:A light source unit 6, which consists of each one of red light emitting tube 1, green light emitting tube 2 and blue light emitting tube 3 and which has a reflecting plate 4, is provided in the side surface of a diffusion plate 5, which is obtained by performing the milky processing to one surface of a transparent plate. The light incident from the side surface of the diffusion plate 5 is mixed inside to mix the color thereof, and the light of the mixed color as the whole is emitted from the main surface of the diffusion plate 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface emitting light source utilizing changes in brightness and light color.

[0002]

2. Description of the Related Art Hitherto, since a light source for illumination has been indispensable in daily life and the first purpose was to make it bright, the appearance of colors (color rendering) was neglected. However, with the diversification of people's lives, the development of fluorescent lamps that take into account the color and brightness of lighting has become important, and products such as three-wavelength emission type fluorescent lamps that are bright and that display colors faithfully have been commercialized. ing. In recent years, in order to live a more comfortable life, lighting that changes the light color and brightness according to the environment, fluorescent lamps that are easy on the human eye for the aging society in the near future, and people's sensibility are being used. Lighting is being developed that creates a psychologically and emotionally calm atmosphere.

FIG. 3 is a block diagram of a conventional surface emitting light source.
As shown in FIG. 3, in the conventional surface emitting light source, a plurality of arc tubes 11 coated with a monochromatic phosphor are caused to emit light, and the light emitted therefrom is diffused by a diffusion plate 12 to perform color mixing. in this case,
When the distance between the arc tube 11 and the diffusion plate 12 was sufficiently long, a certain amount of color mixture was obtained.

[0004]

However, in the above-mentioned conventional configuration, a large number of small arc tubes are combined,
By increasing the distance between the arc tube and the diffuser, it is possible to mix and mix light to some extent, but many circuits are required and the luminaire itself becomes large, so it is not a large scale for general household use. There was a problem that equipment was required.

The present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide a surface emitting light source that is small in size and can uniformly emit light in a large area to extract mixed light.

[0006]

In order to achieve this object, a surface emitting light source of the present invention comprises an arc tube whose emission color changes and a reflector which covers the back of the arc tube, and the reflector is the arc tube. Light emitted from the light guide plate is introduced into the side surface of the light guide plate, and the light is mixed in the light guide plate and diverges from one main surface of the light guide plate.

[0007]

With this structure, the light from the arc tube is reflected by the reflection plate and is incident on the side surface of the light guide plate, so that it is possible to diffuse the light inside the light guide plate, mix the colors, and uniformly provide the light. . Therefore, by using the fluorescent lamp whose illumination color and brightness are changed, it is possible to obtain a uniform surface emitting light source whose color and brightness are changed.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram of a surface emitting light source according to an embodiment of the present invention. In FIG. 1, 1 is a red arc tube, 2 is a green arc tube, 3 is a blue arc tube, 4 is an arc tube 1,
Each arc tube 1, with a reflector installed so as to cover a few
A diffuser plate 5 with a transparent plate on one side of the light from 2 and 3
It leads to the side of. It should be noted that the light emitting tubes 1, 2, 3 and the reflector 4 constitute a light source unit 6.

FIG. 2 is a top view of the surface emitting light source of FIG. Light source units 6 in which the light emitting tubes 1, 2, 3 and the reflection plate 2 are combined are installed on four sides of the diffusion plate 5. With this configuration, the light emitted from each of the arc tubes 1, 2, and 3 is reflected by the reflection plate 4 and condensed on the side surface of the diffusion plate 5. The light incident on the inside of the diffusion plate 5 is diffused on the opalized surface, and as a result, mixed color light is obtained.

In this embodiment, an example in which the arc tubes 1, 2, and 3 coated with phosphors of three colors of red, green, and blue are used is explained. However, phosphors of three colors of red, yellow, and blue are used. The same uniform color-mixing effect can be obtained even when a light-emitting tube coated with is used or in the case of fluorescent lamps of incandescent color, daylight color, and white.

In this embodiment, the light source unit 6
Although the example in which the light emitting device is installed in all four directions of the side surface of the diffusion plate 5 has been described, light can be mixed and mixed even if it is installed in only one side surface or in two directions of adjacent side surfaces or opposite side surfaces.

[0012]

As described above, according to the present invention, since the reflecting plate introduces the light emitted from the light source to the side surface of the light guide plate, it is possible to obtain a uniform light emitting surface, and also in view of visibility. It is possible to realize an excellent surface emitting light source capable of obtaining a sufficient light color for illumination.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a surface emitting light source according to an embodiment of the present invention.

FIG. 2 is a top view of the same surface emitting light source.

FIG. 3 is a configuration diagram of a conventional surface emitting light source.

[Explanation of symbols]

 1 Red luminous tube 2 Green luminous tube 3 Blue luminous tube 4 Reflector 5 Diffuser (light guide plate)

Claims (3)

[Claims] 1. A light-emitting tube, a reflector and a light guide plate, each of which emits light of a different color, are provided. A surface emitting light source that diverges from one main surface of the light guide plate. 2. The surface-emitting light source according to claim 1, wherein a plurality of monochromatic arc tubes having different emission colors are used instead of the arc tube whose emission color changes. 3. The surface emitting light source according to claim 1, wherein the light guide plate is a diffuser plate obtained by opalizing one surface of a transparent plate.