JPH0394290A - Variable color light source device - Google Patents

Abstract

PURPOSE:To substantially make one picture element of one light source by disposing three straight tube-like light sources emitting red, green and blue light beams in a reflection mirror whose base is open and which is shaped to be conical so that the tube axis may make an right angle with the base of the reflection mirror and also disposing a shielding plate for covering the light source on the central part of the opening surface. CONSTITUTION:The inner surface of the reflection mirror 1 shaped to be conical and whose base is open is made of a mirror surface, and the straight tube type fluorescent lamps 2a - 2c disposed in the reflection mirror 1 present the emitted light colors; red, green and blue. And the shielding plate 3 covering the tube end parts of the fluorescent lamps 2a - 2c is disposed on the central part of the opening surface of the reflection mirror 1. When the fluorescent lamps 2a - 2c are turned on, the colors of the light beams emitted from the opening surface of the reflection mirror 1 are mixed and the emitted light colors are optionally controlled. And since the shielding plate 3 is disposed at the central part of the opening surface of the reflection mirror 1, the lamp 2 cannot be directly viewed from a display screen side, the light which can be observed from an external part is only the light reflected on the reflection mirror 1, so that the performance of mixing colors can be improved. Thus, one picture element can be substantially made of one light source.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a variable color light source used in color information display devices and the like. [Prior Art] In recent years, information display devices that provide various information have been installed in buildings, stations, lobbies, etc., and it is thought that the installation of such information display devices will become more popular in the future. ．． Among such information display devices, those capable of displaying color information have a richer amount of information and attract more attention, so it is thought that color information display devices will become mainstream in the future. Currently, color information display devices, regardless of their light emitting method, have a display surface constructed by arranging light sources that emit red, green, and blue light on a flat surface; This is an attempt to realize color display by viewing from different locations. [Problems to be Solved by the Invention] However, when a color information display device such as the one described above is viewed from a close distance, red, green, and blue appear separately, making it difficult to accurately display the information intended by the information provider. There was a problem that there was a possibility that the information would not be transmitted. To solve this problem, it is necessary for one light source to emit light in all colors, but it is impossible to realize such a light source with current technology, and an alternative light source is required. The present invention has been made in view of the above points, and an object thereof is to provide a variable color light source device in which one picture element of a color information display device can be configured with substantially one light source. .

[Means for Solving the Problems] In order to solve the above problems, the present invention includes three straight tube light sources that emit red, green, and blue light and are bundled so that their tube axes are parallel.
The light source is characterized in that the tube axis is arranged in a conical reflecting mirror with a bottom opening so that it is perpendicular to the bottom surface, and a shielding plate is provided in the center of the opening surface to cover the tube end of the light source. It is something.

[Function] With the above structure, the red, green, and blue lights emitted within the reflector are reflected by the reflector and mixed,
The mixed color light is irradiated to the outside through the aperture surface. Therefore,
If the aperture surface of such a variable color light source device is used as a display surface and one picture element of a color information display device, substantially l.
One picture element can be constructed with one light source. [Embodiment] Fig. 1 is a simplified diagram showing an embodiment of the present invention. In the figure, 1 is a conical reflecting mirror with an open bottom, and its inner surface is a mirror surface. 2a, 2b, 2c are A straight tube fluorescent lamp is placed inside the reflector 1, and each emits red, green, and blue colors. Reference numeral 3 denotes a shielding plate that covers the tube ends of the straight tube type fluorescent lamps 2a, 2b, and 2c, and is provided at the center of the opening surface of the reflecting mirror l.

In such a structured variable color light source device, by controlling the lighting of each of the fluorescent lamps 2a, 2b, and 2c using a well-known lighting control circuit, the light emitted from the aperture of the reflecting mirror 1 is mixed in color. The color of the emitted light can be controlled arbitrarily. In addition, since a shielding plate 3 is provided at the center of the aperture of the reflector 1, the lamp 2 cannot be directly seen from the display surface side, and the only light that can be observed from the outside is the light reflected by the reflector 1. Therefore, the color mixing performance is improved.

Furthermore, since the lamp 2 is a straight tube type, the opening area of the reflecting mirror 1 on the light emitting surface side is small, and a variable color light source with a small light emitting surface can be provided. Therefore, the l of the color information display device is
This makes it suitable as a light source for viewing two picture elements. It should be noted that the present invention is of course not limited to the above-mentioned embodiments; for example, the lamp may be a straight tube-shaped incandescent lamp.

[Effects of the Invention] As described above, the present invention includes three straight tube-shaped light sources that emit red, green, and blue light, which are bundled so that the tube axes are parallel, and the tubes are placed inside a conical reflecting mirror with an opening at the bottom. By arranging the axis so that it is perpendicular to the bottom surface and by providing a shielding plate covering the tube end of the light source in the center of the aperture surface, one picture element can be constructed with substantially one light source. It is possible to provide a variable color light source with a compact light emitting surface.

[Brief explanation of drawings]

FIG. 1 is a simplified perspective view showing one embodiment of the present invention.

Claims (1)

[Claims] (1) Three straight tube light sources that emit red, green, and blue light are bundled so that their tube axes are parallel, and are arranged inside a conical reflecting mirror with an opening at the bottom so that the tube axes are perpendicular to the bottom surface. At the same time,
A variable color light source device characterized in that a shielding plate that covers a tube end of the light source is provided at the center of the opening surface.