JPH0644476B2 - Electron arc tube device - Google Patents

Description

TECHNICAL FIELD The present invention relates to an electron arc tube device capable of changing the light color with a single arc tube.

(Background Art) Conventionally, various light sources such as an incandescent lamp, a fluorescent lamp, and a mercury lamp have been put into practical use as a light source for illumination or a display, and are utilized in various fields by utilizing their respective characteristics.

By the way, in general, these light sources have a unique emission color, and when it is desired to obtain a different color tone, the light source is replaced or a plurality of types of light sources are provided side by side.
It is necessary to selectively turn on the light depending on the situation, and a system in which the color tone can be freely controlled by one tube has not been realized yet.

(Object of the Invention) The present invention has been made in view of the above points, and an object thereof is to provide an electron arc tube device capable of freely changing the light color with a single arc tube. It is in.

(Disclosure of the Invention) Hereinafter, the present invention will be described. FIG. 1 is a conceptual diagram showing the basic structure of the present invention. In the figure, reference numeral 1 is a glass tube having a substantially fan-shaped cross-section that forms a vacuum space 2. 3 is provided, and an anode 4 made of a transparent conductive film is provided on the inner surface of the spherical surface portion. Then, a fluorescent body 5 described later is applied on the transparent conductive film forming the anode 4. The configuration of the anode 4 may be such that a mesh-shaped conductor is arranged along the inner surface of the light emitting surface of the glass tube 1.

The phosphor 5 is a mixture of two types of low energy electron beam excitation type phosphors F1 and F2 having an excitation distribution and an emission distribution as shown in FIGS. 2 (a) and (b) in advance.
The fluorescent body F1 has a blue color (for example, the chromaticity at the point B in the chromaticity diagram shown in FIG. 3 at the rated applied voltage (blue)), and the fluorescent body F2 has a yellow color (for example, at the rated applied voltage Y in the chromaticity diagram shown
Chromaticity (yellow) of the point, the mixture ratio is the rated applied voltage,
For example, at the point A in the chromaticity diagram shown in FIG.
It is adjusted so that 0 ° K white) comes.

Then, when the applied voltage between the cathode 3 and the anode 4 is increased from the rated applied voltage, the emitted thermoelectrons e are accelerated more strongly,
It collides with the fluorescent body 5 with higher energy. Then, the fluorescent substance F1 having a higher energy excitation sensitivity is more strongly excited and emits light, and as a whole, a cold color tone (for example, bluish white) having a higher color temperature is obtained. On the contrary, if the voltage is lower than the rated applied voltage, the electron energy hitting the fluorescent body 5 is lowered, and the degree of excitation of the fluorescent body F2 is increased this time. Light bulb color). Therefore, the light color (color temperature) can be freely changed from the cold color tone to the warm color tone by a simple control by changing the applied voltage.

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 an alternating current, a simpler configuration and control will be required.

(Effects of the Invention) As described above, the present invention provides the thermionic emission cathode 3 arranged in the glass tube 1 forming the vacuum space 2 and the inner surface of the light emitting surface of the glass tube 1 or in the vicinity of the inner surface thereof. A voltage is applied between the cathode 4 and the anode 4, the thermoelectrons e emitted from the cathode 3 are accelerated in the vacuum space 2, and collide with the low-energy electron beam excitation type phosphor 5 coated on the light emitting surface. 1. An electron arc tube device which excites and illuminates the phosphor 5, wherein the phosphor 5 is a mixture of a blue phosphor and a yellow phosphor having different excitation energies. It is composed of an optical material and a mixed fluorescent material 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 variable. Therefore, by simply controlling the applied voltage, you can change from cold tones to warm colors. It was possible to provide an electroluminescent tube device capable of freely changing the light color (color temperature) to the color tone of.

[Brief description of drawings]

FIG. 1 is a conceptual diagram showing the basic structure of the present invention, FIG. 2 is a characteristic diagram of a fluorescent body, FIG. 1 (a) shows excitation distribution, FIG. 2 (b) shows emission distribution, and FIG. 3 shows It is a chromaticity diagram. 1 ... glass tube, 2 ... vacuum space, 3 ... cathode, 4 ...
Anode, 5 ... Fluorescent material.

Claims (2)

[Claims] 1. A cathode is provided by applying a voltage between a thermionic electron-emitting cathode provided in a glass tube forming a vacuum space and an anode provided at or near the inner surface of the light emitting surface of the glass tube. In the electron arc tube device, which accelerates the emitted thermoelectrons in a vacuum space and collides them with a low-energy electron beam excitation type phosphor coated on the light emitting surface, and excites the phosphor to emit light. There, the fluorescent substance is a mixed fluorescent substance of a blue fluorescent substance and a yellow fluorescent substance with different excitation energies, and the mixing ratio thereof becomes white at the rated applied voltage. Is composed of mixed phosphors adjusted to
An electron arc tube device characterized in that a voltage applied between a cathode and an anode is variable. 2. The electron arc tube device according to claim 1, wherein the applied voltage is a full-wave rectified voltage from an alternating current.