JPH0329263A - Electronically excited light emitting tube - Google Patents

Abstract

PURPOSE:To enable free adjustment of color of light with one light emitting tube in a vacuum glass tube by emitting light through control of application voltage to mixed body of electron beam excitation type fluorescent member. CONSTITUTION:Thermoelectron emitting cathode 3 and anode 4 are arranged inside a vacuum glass tube 1, wherein blue light emitting fluorescent member and yellow light emitting fluorescent member 5 are coated onto the anode 4. Between the cathode 3 and anode 4, all wave rectifying voltage of A.C. is, for example, applied in a variable manner. According to the magnitude of the application voltage, that is, in the case of the maximum blue becomes strong while in the case of lower level yellow becomes strong. It is thus possible to provide a desired color including white by controlling the application voltage by the use of one light emitting tube.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to an electronic arc tube device that can change the color of light with a single arc tube. (Background technology) Various light sources such as incandescent light bulbs, fluorescent lamps, and mercury lamps have been put into practical use as light sources for illumination or displays, and are used in various fields by taking advantage of their respective characteristics. By the way, these light sources generally emit a unique color, so if you want to obtain a different color tone, you can either replace the light source or install multiple types of light sources together.
It is necessary to turn on the lights selectively depending on the situation, and a method that allows the color tone to be freely controlled using a single bulb has not yet been realized. (Object of the Invention) The present invention has been made in view of the above points, and its purpose is to provide an electronic arc tube device that can freely change the color of light with a single arc tube. It is in. (Disclosure of the Invention) The present invention will be explained below. FIG. 1 is a conceptual diagram showing the basic structure of the present invention. In the figure, l is a glass tube with a substantially fan-shaped cross section that forms a vacuum space 2, and the inside of the tube, which corresponds to the key point, has a thermoelectron emitting material. A cathode 3 is disposed, and an anode 4 made of a transparent conductive film is disposed on the inner surface of the spherical surface. A phosphor 5, which will be described later, is coated on the transparent conductive film forming the anode 4. Note that the structure of the anode 4 may be such that a mesh-like conductor is arranged along the inner surface of the light emitting surface portion of the glass tube 1. The above-mentioned phosphor 5 is a mixture of two types of phosphors Fl and F2 of the low-energy electron beam excitation type having excitation distributions and emission distributions as shown in FIGS. 2(a) and 2(b). , the phosphor Fl has a blue color (e.g., the chromaticity (blue) at point B in the chromaticity diagram shown in FIG. This is the chromaticity (yellow) at point Y in the chromaticity diagram shown in Figure 3, and the mixing ratio is the chromaticity (yellow) at point A in the chromaticity diagram shown in Figure 3 at the rated applied voltage.
The temperature is adjusted so that the color temperature is 5000 K (white). Therefore, as the voltage applied between the cathode 3 and the anode 4 is increased above the rated voltage, the acceleration of the emitted thermionic electrons e becomes stronger. ,
It collides with the phosphor 5 with higher energy. Then, the fluorophore FlO, which has a higher sensitivity to high-energy excitation, is more strongly excited and emits light, resulting in a cooler color tone (for example, blue-white) with a higher color temperature as a whole. Conversely, if the applied voltage is lowered from the rated voltage, the electron energy hitting the phosphor 5 will decrease, and the degree of excitation of the phosphor F2 will increase, resulting in a warm color with a low color temperature as a whole! It becomes I1 (light bulb color). Therefore, the light color (color temperature) can be freely changed from a cool color tone to a warm color tone by simply changing the applied voltage. In addition, in FIG. 1, R is a resistance and DC is an applied voltage. If the applied voltage DC is a full-wave rectified voltage from AC,
It requires a simpler structure and control. (Effects of the Invention) As described above, the present invention includes a thermionic emitting cathode 3 disposed within the glass tube 1 defining the vacuum space 2, and a thermionic emitting cathode 3 disposed on the inner surface or near the inner surface of the light emitting surface portion of the glass tube 1. A voltage is applied between the provided anode 4 and the thermionic electrons e emitted from the cathode 3 are accelerated in the vacuum space 2 and applied to the low-energy electron beam excitation type phosphor 5 coated on the light emitting surface. The phosphor 5 is made of a blue phosphor and a yellow phosphor having different excitation energies. It consists of a mixed phosphor whose mixing ratio is adjusted so that the light color becomes white at the rated applied voltage, and the applied voltage between the cathode 3 and the anode 4 is made variable. Therefore, it is possible to provide an electron luminous tube device that can freely change the light color (color temperature) from a cool color tone to a warm color tone with simple control by simply changing the applied voltage. Ta.

[Brief explanation of drawings]

Figure 1 is a conceptual diagram showing the basic structure of the present invention, Figure 2 is a characteristic diagram of the phosphor, where (a) shows the excitation distribution, (bl shows the emission distribution, and Figure 3 shows the emission distribution. It is a chromaticity diagram. 1... Glass tube, 2... Vacuum space, 3... Cathode,
4... Anode, 5... Fluorescent material.

Claims (2)

[Claims] (1) A voltage is applied between a thermionic-emitting cathode disposed in a glass tube forming a vacuum space and an anode disposed on or near the inner surface of the light-emitting surface of the glass tube, and the electrons are emitted from the cathode. An electron luminous tube device comprising: accelerating the generated thermoelectrons in a vacuum space and colliding with a low-energy electron beam excitation type phosphor coated on the light emitting surface to excite the phosphor and cause it to emit light. , the above phosphor is a mixed phosphor of a blue phosphor and a yellow phosphor having different excitation energies, and the mixing ratio is such that the light color becomes white at the rated applied voltage. An electron luminous tube device comprising a controlled mixed phosphor and having a variable voltage applied between a cathode and an anode. (2) The electron arc tube device according to claim 1, wherein the applied voltage is a full-wave rectified voltage from alternating current.