JPS6215750A - Variable-colored fluorescent lamp - Google Patents

Abstract

PURPOSE:To obtain a variable-colored fluorescent lamp in which the chromatic purity does not fall and a chromatic irregularity is unlikely to arise, by providing an electrode at one end of each glass tube, opening the other end into a light source tube, and providing a common electrode in the light source tube at the lower portion thereof. CONSTITUTION:At least the top 10a of a light source tube 10 is made of a light-permeable material. The top 10a serves as a display surface. The light source tube 10 is shaped as a box. A gas for discharge is enclosed in the internal hermetic space of the tube 10. Glass tubes 12R, 12G, 12B are provided in the upepr portion of the light source tube 10. Light emission substances 6R, 6G, 6B, which emit different colors of light, are provided on the inside surfaces of the glass tubes. One end of each of the glass tubes 12R, 12G, 12B is secured to the side wall 10b of the light source tube 10. Anodes 4R, 4G, 4B are provided at the ends of the glass tubes secured to the side wall 10b. The other ends of the glass tubes are opened into the light source tube 10.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field 1] The present invention relates to a variable color fluorescent lamp used in large color display devices and the like.

[Background Art] Conventionally, this type of variable color fluorescent lamp has been proposed by the present inventor and shown in FIGS. 8 to 11. This variable color fluorescent lamp is shown in Fig. 8 or f:trJ.
As shown in Fig. 9, two partition plates 28t 2 b are provided in a flat light source tube 1 in which a discharge gas is sealed, forming three parallel discharge paths 3 R, 3G, and 3B. It is. Anode electrodes 4R, 4G are provided independently at one end of each discharge path 3R, 3G, 3B.

4B, and a cathode electrode 5 as a common electrode is provided in the open portion at the other end. Each discharge path 3 R, 3
The inner wall surfaces of G and 3B are coated with phosphors 6 of different emission colors, for example, red phosphor 6R is applied to the discharge path 3R, green phosphor 6G is applied to the discharge path 3G, and phosphor 6 is applied to the discharge path 3B.
A blue phosphor 6B is applied to the surface.

As shown in FIG. 10, the lighting circuit for lighting the above-mentioned variable color fluorescent lamp is as shown in FIG.
It is connected to a selection changeover switch SW (specifically, a transistor switch that varies the duty) that controls the supply to each anode electrode 4R, 4G, and 4B, and a starting point is connected between the anode electrode 4B and the cathode electrode 5. starter ST is connected. Discharge is performed between the anode electrodes 4R, 4G, 4B and the cathode electrode 5, and each discharge path 3R is set by increasing the switching cycle of the selection changeover switch SW and arbitrarily changing each duty ratio. , 3G, and 3B can be smoothly changed to freely obtain any luminescent color.

For example, the light source tube body 1 having the above-mentioned configuration has an angle of 2c+n or 5
It is possible to form a medium-sized or large-sized color display device by using small flat pixels of approximately 0 ω angle and arranging them in a constant manner as shown in FIG.

However, the above-mentioned variable color fluorescent lamp has the following problems due to its structure. In other words, each discharge path 3
Since R+3Gr3B is open near the cathode electrode 5, no matter which discharge path 3R, 3G, 3B is selected, ultraviolet rays will be transmitted to other discharge paths 3R, 3G.

The phosphor 6 of 3B was caused to emit light, albeit slightly. As a result, there was a drawback that color purity decreased.

Furthermore, since the color of emitted light cannot be selected in the area where the cathode electrode 5 is provided, it is necessary to mask it, resulting in non-uniformity on the display surface. Furthermore, since the discharge paths 3R93G and 3B are not completely independent, there is a problem in that it is difficult to separate the phosphors 6R, 6G and 6B, and unevenness tends to occur.

[Object of the Invention] The present invention has been made in view of the above-mentioned points, and its object is to provide a variable color fluorescent lamp in which color purity is less likely to decrease and color unevenness is less likely to occur.

[Disclosure of the Invention 1 (Structure)] The present invention comprises a substantially box-shaped light source tube whose at least the upper surface is made of a transparent material and whose internal airtight space is filled with a discharge gas; Each glass tube has an electrode at one end, the other end is open inside the light source tube, and a common electrode is installed at the bottom of the light source tube. By using a plurality of lath tubes to make each discharge path independent, and by reducing the area of the opening of the glass tube into the light source body, ultraviolet rays generated when a certain discharge path is selected. In addition, the color purity of the display screen is improved by reducing the emission of phosphors in other discharge paths, and the glass tube is placed in the upper part of the light source tube and a common electrode is provided in the lower part of the light source tube. This allows the upper surface of the light source tube to be used as a display surface as uniform pixels without the need for a mask, and furthermore, by using a glass tube, it is easier to apply the phosphor and it is less likely to cause color unevenness. .

(Example) FIGS. 1 to 4 are diagrams showing an example of the present invention,
The light source tube 10 of this embodiment has at least a top surface 10a made of a translucent material, the top surface 10a serving as a display surface, and a substantially box-shaped interior with a discharge gas (argon, mercury, etc.) sealed in the airtight space. It has the shape of This light source tube 10
Glass tubes 12R, 12G, and 12B are disposed in the upper part of the dog, and the inner surfaces of the glass tubes 12R, 12G, and 12B are coated with luminous materials 6R, 6G, and 6B that emit different colors of light. One end of each glass tube 12R, 12G, 12B is fixed to the side wall 10b of the light source tube 10, and anode electrodes 4R, 4G, 4B are provided respectively, and the other end is fixed to the side wall 10b of the light source tube 10.
It is open inside. #2 diagram shows glass tubes 12R, 12G
, 12 The other end of B is cut diagonally so that it is opened into the light source tube 10, and the cut end is directed downward and the area of the open part is made sufficiently smaller than the area of the upper surface 10g serving as a display surface. It is. This glass tube 12R
, 12G.

As for the shape of the other end of 12B! #3 A through hole 14 may be formed as shown in FIG. 3(a), or a notch 15 may be provided as shown in FIG. 3(b). and,
A cathode electrode 5 as a common electrode is disposed on the bottom surface of the light source tube body 10 below the glass tubes 12R, 12G, and 12B. An auxiliary anode 13 is placed on the side of the cathode electrode 5.
A starter ST is connected between the auxiliary anode 13 and the cathode electrode 5 as shown in FIG. The distance between the cathode electrode 5 and the auxiliary anode 5 is long, so that it is difficult to start, and since the phosphors 6R, 6G, and 6B that should emit light are not present between the cathode electrode 5 and the auxiliary anode 13, selection switching is possible. By changing the duty ratio by the switch SW, it is possible to express gradation as a color display device. The downwardly protruding portion in FIG. 2 is the exhaust pipe 16. The various parts of this variable color fluorescent lamp are hermetically sealed and fixed using, for example, an fj' lath 7 watt.
Furthermore, in conjunction with the provision of the auxiliary anode 13, a start mode is added to the switching modes of the selection switch SW as shown in FIG. Insert R5.

(Example 2) FIG. 5 is a diagram showing another example of the present invention, and Example 1
The sides of the anode electrodes 4R, 4G, and 4B of the light source tube body 10 are formed in a protruding manner, and the anode electrode 4R.

The lead wires of 4G and 4B are made to extend downward. By forming the light source tube body 10'' in this manner, the lead wires of the anode electrodes 4R, 4G, and 4B can be gathered downward, and when these variable color fluorescent lamps are arranged in a fixed manner as a color display, they can be brought into close contact with each other. It is something that can be done.

The other configurations are the same as those in the first embodiment, so their explanation will be omitted.

(Embodiment 3) FIG. 6 is a diagram showing still another embodiment of the present invention, which, like Embodiment 2, is characterized by the shape of the light source tube 10゛, and is made of diagonally cut glass. Pipe 12 R, 12
The light source tube 10''' is formed by protruding the holding part 10c in accordance with the shape of the open end so that the upper end of the open end of G and 12B is held, and the other shapes are as in Example 2. In this embodiment, since the holding portion 10c is formed, the glass tubes 12R, 12G, and 12B can be easily positioned and fixed when manufacturing a variable color fluorescent lamp.
This will reduce the defective rate.

(Embodiment 4) FIG. 7 is a diagram showing still another embodiment of the present invention. In Embodiment 2 and Embodiment 3, the light source tubes 10',
The anode electrodes 4R, 4G, 4B sides of the anode electrodes 4R, 4G, 4B protrude laterally so that the upper surface 10a as a display surface can be closely arranged; however, in this embodiment, the glass tubes 12R', 12G
', 12 B' is curved into an L-shape. Also,
The light source tube 10' of this embodiment is also provided with a holding portion 10c similar to that of the third embodiment to facilitate positioning and fixing of the lath tubes 12R, 12G, and 12B. By bending the glass tubes 12R', 12G', and 12B' into an L-shape and arranging the anode electrodes 4R, 4G, and 4B in a concentrated manner on the bottom surface of the light source tube body 10"', In addition, in the above-mentioned embodiments 1 to 3, there are provided 1 [! polar electrode 4R,
Since 4G and 4B exist, glass tubes 12R, 12G,
12B, but in this example, the anode electrode 4
Since R, 4G, and 4B are on the bottom surface, the glass tubes 12R', 12G', and 12B' emit light uniformly when viewed from the direction of the top surface 10a.

[Effects of the Invention] As described above, the present invention provides a substantially box-shaped light source tube in which at least the upper surface as a display surface is formed of a translucent material and a discharge gas is sealed in the airtight space inside the tube, and the light source. It consists of a plurality of glass tubes placed in the upper part of the tube and each of which has an inner surface coated with luminous materials of different colors.An electrode is provided at one end of each of the glass tubes, and the other end is opened inside the light source tube. Since a common electrode is provided at the bottom of the body, each discharge path can be formed independently by providing a glass tube for each discharge path.
In addition, the open portion of the glass tube can be easily configured to face downward with respect to the upper surface and to have a minimum area. Therefore, it is possible to reduce the fact that the light emitters in the other discharge paths emit light due to the ultraviolet rays generated when a certain discharge path is selected, thereby reducing color mixing and improving the color purity of the display surface. In addition, by placing the glass tube in the upper part of the light source tube and the common electrode in the lower part of the light source tube, the glass tube can be placed over the entire display surface, unlike conventional methods. There is no need to hide the common electrode with a mask, etc., and it can be used as a uniformly shaped pixel.Furthermore, since a glass tube is provided for each discharge path, the light emitter can be used like a conventional partition plate. There is no need to separately paint the luminous material, making it easier to apply the luminous material, preventing color unevenness caused by poor application, and since the volume of the light source tube is larger than before, the influence of impurity gas is reduced, and the lamp It has the effect of extending the lifespan.

[Brief explanation of drawings]

@ Figure 1 is a perspective view showing the first embodiment of the present invention, Figure 2 is a sectional view of the same, and Figures 3 (a) and (b) are other shapes of the main parts of the glass tube used in the above. FIG. 4 is a circuit configuration diagram showing a lighting circuit for lighting the same, FIG. 5 is a sectional view showing a second embodiment of the present invention, and FIG. 6 is a third embodiment of the present invention. 7 is a sectional view showing the fourth embodiment of the present invention, FIG. 18 is a top view showing the schematic structure of the conventional example, FIG. 9 is a perspective view of the same as above, and FIG. 10 is same as above. FIG. 11 is an explanatory diagram showing an arrangement when the same as above is used in a color display. 10 to 101゛ are light source tubes, 10a is the top surface, 12R, 1
2G, 12B, 12R', 12G', 12B' are glass tubes, 4 R, 4G, 4 B are anode electrodes, 5 is a cathode type electrode, 13 is an auxiliary electrode, 6 R, 6G, 6 B are light emitters. be. Agent Patent Attorney Ishi 1) Chief Figure 7 Figure 8 Figure 9 Figure 10 Figure 11 Procedural Amendment (Voluntary) August 30, 1985

Claims (1)

[Claims] (1) A substantially box-shaped light source tube whose upper surface as a display surface is made of a translucent material and whose internal airtight space is filled with discharge gas; It consists of a plurality of glass tubes coated with luminous substances of different luminescent colors, each of the glass tubes has an electrode at one end, the other end is open inside the light source tube, and a common electrode is provided at the lower part of the light source tube. Variable color fluorescent lamp.