JPS6031236B2 - Slow electron beam excitation fluorescent display tube - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a novel low-speed electron beam-excited crab light display tube that emits blue light, and more specifically, the present invention relates to a blue light display tube having a crab light film made of a gallate-based composite oxide crab light material. The present invention relates to a new low-speed electron beam-excited crab light display tube that emits light.

As is well known, a slow electron beam excitation light display tube has an essential structure in which an anode plate having a light film on one side and a cathode facing the light film are enclosed in a vacuum container. A low-velocity electron beam emitted from the cathode excites the crab film on the anode plate to emit light.

1 and 2 are schematic configuration diagrams of typical examples of low-speed electron beam excitation light receiving and display tubes, with FIG. 1 showing a diode tube and FIG. 2 a triode tube. As shown in FIGS. 1 and 2, a flea film 1 is formed on one side of an anode plate 11 made of an aluminum plate or the like.
2 is provided. Anode plate 11 is supported by ceramic substrate 13. A cathode 14 is provided opposite the halo film 12 provided on one side of the anode plate 11, and the halo film 12 is excited by the slow electron beam emitted from the cathode 14 to emit light. In particular, in the triode shown in FIG.
A grid electrode 15 is provided for controlling or diffusing the low-speed electron beam emitted from the electron beam. Although one cathode 14 is used in the slow electron beam-excited light display tube shown in FIGS. More than one book may be provided, and the number is not particularly limited. The anode plate 11 having a luminous film 12 on one side, the ceramic substrate 13 and the cathode 14
(Fig. 1) Alternatively, an anode plate 11 having a crab-light film 12 on one side, a ceramic substrate 13, a cathode I4, and a grid electrode 15 (Fig. 2) are enclosed in a transparent container 16 made of glass or the like. 17 is 10-5 to 10-9 Torr
It is kept in a high vacuum. Conventionally, a zinc-activated zinc oxide crab phosphor (Zn0:Zn) has been known as a phosphor that emits light with high brightness by excitation with a slow electron beam.

This crab photoreceptor is obtained by firing zinc oxide (Zn○) in a reducing atmosphere or by adding a certain amount of a zinc compound such as zinc sulfide (ZnS) to ZnO and firing it in air. When excited by a line, it emits high-intensity green-white light. Crab light material Zn○: A low-speed electron beam-excited crab light display tube using a backlight film made of Zn is widely used industrially as a display element for, for example, desktop computers and various measuring instruments. As described above, slow electron beam excitation light display tubes using Zn○:Zn as a honeycomb film have been put into practical use, but other than Zn○:Zn, almost no crab photoresist that emits light by slow electron beam excitation is known. Therefore, a slow electron beam-excited crab optical display tube in which the fin optical film is made of a crab optical material other than Zn○:Zn has hardly been known in the past. SUMMARY OF THE INVENTION In view of the above-mentioned current situation, it is an object of the present invention to provide a slow electron beam excited crab light display tube that emits high-intensity blue light.

The present inventors have conducted various studies with the aim of obtaining a halo exhibiting high-intensity light emission through slow electron excitation and a slow electron excitation crab light display tube using the halo halo. .

As a result, the composition formula is A(Zn, -X, MgX)○・Ga2
03 (however, 0.6≦A≦1.2 and OSxSO.5), the gallate-based composite oxide crab photoreceptor emits high-intensity blue light under slow electron beam excitation at an accelerating voltage of 100V or less. They also discovered that this gallate-based composite oxide was used as a crab light film to invent a low-speed electron beam-excited flea light display tube.

That is, the present invention has a structure in which an anode plate having a crab-light film on one side and a cathode facing the crab-light film are sealed in a vacuum container, and an accelerating voltage applied to the anode plate. In a slow electron beam excited crab light display tube where the voltage is 100 V or less, the crab light film is
- It is characterized by being a gallium salt-based composite oxide phosphor represented by the composition formula Ga203 (A and x have the same definitions as above).

The gallium salt-based composite oxide phosphor having the above composition formula used for the phosphor film of the low-speed electron beam-excited phosphor display tube of the present invention is manufactured by the manufacturing method described below. That is, zinc oxide (
Zinc compounds that can be easily converted to Zn0 at high temperatures such as Zn○) or carbonates, sulfates, and nitrates, and magnesium oxide (Mg○) or magnesium compounds that can be easily converted to Mg0 at high temperatures such as carbonates, sulfates, and nitrates. When the compound and gallium oxide (Ga203) or gallium compounds that can be easily converted to Ga203 at high temperatures such as carbonates, sulfates, and nitrates are all converted into oxides, the composition formula is A.
(Zn, -X, MgX)○・Ga203 (However, 0.6≦
A≦1.2 and OSxSO. 5), and the resulting mixture is packed in a heat-resistant container such as an alumina crucible or a quartz crucible and fired.

The above-mentioned raw materials are thoroughly mixed using a ball mill, mixer mill, etc., and firing is performed once to several times for 1 hour or more at a high temperature of 1000 oo or more. Note that the firing is performed in air, in a neutral atmosphere, or in a weakly reducing atmosphere. More preferable firing conditions are 1200 pm to 1400° when firing in air.
The firing time is 2 to 4 hours at a temperature of 1,000 to 1,200 q0 in the case of firing in a neutral or weakly reducing atmosphere.
for 2 to 4 hours at a temperature of . When firing is performed two or more times, the reaction can be further accelerated by performing a pulverizing and mixing operation after the previous firing.

By the above-mentioned manufacturing method, a gallate-based composite oxide phosphor having the composition formula A(Zn, -X, MgX)◯.Ga203 (where A and x have the same definitions as above) is obtained.

Incidentally, this gallate-based composite oxide crab photo substance itself is conventionally known, for example, Samurai Kosho 4? 19762 and Hakama Kosho No. 48-4303, the manufacturing method, luminescent properties, etc. are described, but it was not known that this crab luminous substance emits light with high brightness by slow electron excitation of 100 V or less.

Next, a method for manufacturing the slow electron beam excited crab light display tube of the present invention will be described.

First, a gallate-based composite oxide phosphor is coated onto an anode plate, which is usually supported by a ceramic substrate, by a precipitation coating method to form a phosphor film. In other words, an anode plate is placed in a suspension of crab phosphors dispersed in water, and the crab phosphor's own weight causes the halo to settle on one side of the anode plate and coated.The water is then removed to form a coating. Dry. In order to improve the adhesion of the resulting crab film to the anode plate, a certain amount (0.01 to 1%) of water glass may be added to the suspension. In addition, the crab light coating density is 5 females/skin ~ 3
0mp/reduction is appropriate. Although the above-mentioned precipitation coating method is generally used as a method for producing a crab light film and is widely used, the method for producing a light film in the low-speed electron beam excitation light display tube of the present invention is limited to this precipitation coating method. It's not something you can do. Next, a linear heater is placed with a cathode coated with oxides such as mother ○, S, Ca○, etc. facing the crab light film on the anode plate, with an interval of about 5 ribs, and this pair After placing the electrode in a transparent container such as glass, the container is evacuated. After the inside of the container reaches a degree of vacuum of at least 10-4 Tom or higher, the exhaust is stopped and the container is sealed. After sealing, the getter is removed to further increase the degree of vacuum inside the container. In this manner, the slow electron beam excited crab light display tube of the present invention can be obtained. The crab light film on the anode plate is flat and the cathode is linear, so in order to diffuse the low-speed electron beam emitted from the cathode, a diffuser is placed between the cathode and the light film as shown in Figure 2. It is preferable to install a mesh-like grid electrode as the electrode. In this case, better results can be obtained by making the mesh as thin as possible so that the loss of the amount of light emitted by the light beam is small and the low-velocity electron beam is well diffused. Specifically, it is desirable that the diameter of the mesh is 500 microns or less, and the Sekiguchi ratio (the area of the holes through which the low-speed electron beam passes relative to the total area of the grid electrode) is 50% or more. The anode plate can display arbitrary characters and figures by dividing the electrode form into the required character and figure shapes and making it possible to selectively apply the required voltage to each electrode. I can do it. In addition, the anode plate is divided into dots or lines, and a gallium salt-based composite oxide film is formed on some of the electrodes, and a gallium-based composite oxide film is formed on other electrodes. By forming a crab light film made of a slow electron beam excitation crab light whose emission color is different from that of the physical crab light, a slow electron beam excited crab light display tube capable of multicolor display can be obtained. FIG. 3 is a graph showing the relationship between the anode plate voltage and the luminance of the halo film in the low-speed electron beam excited crab light display tube of the present invention. Curves a and b indicate that the crab light film is Zm0, Ga203 and Z ratio .6, MgM
) ○・Ga203 is shown.

As is clear from FIG. 3, the slow electron beam excited crab light display tube of the present invention emits high brightness under slow electron beam excitation at an anode plate voltage of several tens to several hundreds of volts. generally gal
As the amount of M illusion conversion of the conjugate-based composite oxide fluorophore, that is, the value of x in the previous composition formula increases, the anode plate voltage required to obtain the same brightness moves in a higher direction.
From the viewpoint of obtaining high brightness with a lower anode plate voltage, it is preferable that the x value in the above compositional formula be a smaller value. Furthermore, the luminance varies depending on the number of moles of (Zn.~, Mgx)○ per mole of Ga2031, that is, the A value of the above compositional formula.
．． 9SASI. The low-speed electron beam-excited light display tube of the present invention, which uses a gallium salt-based composite oxide light material of 0.0 as a light film, exhibits particularly high brightness. The low-speed electron beam excitation display tube of the present invention emits blue light.

Note that AZn0, Ga203 (x=0 in the above compositional formula)
) blue emission and A(Zn, -x, Mgx)○・Ga20
The emitted light color is different from the blue emitted light of No. 3 (0≦x≦1 in the above compositional formula), and the latter is on the longer wavelength side. Figure 4 shows the emission spectrum (curves a,
b) is shown in comparison with the emission spectrum (curve c) of a conventional slow electron beam excited crab light display tube with Zn◯:Zn as the light film. Curves a and b indicate that the crab light film is Zmo/Ga20, respectively.
3 and (Zn ship, Mgo.6) ○・Ga203 is an emission spectrum of a light display tube excited by a slow electron beam. Furthermore, on the CIE color system chromaticity coordinates in FIG. ) is Zn○: Emission chromaticity point (
This is shown in comparison with point C). Points A and B are respectively Zn○・
These are the emission chromaticity points of a light-emission display tube with low-speed electron beam excitation using Ga203 and (Zn Misaki, M-mo.2)○.Ga203 as a backlight film. The low-speed electron beam excitation light receiving display tube of the present invention has points A and B.
As shown in , the color purity is much better than that of the conventional low-speed electron beam-excited light display tube with a light film made of Zn○/Zn, which emits green light that is close to white as shown at point C. It emits blue light.

As described above, the present invention provides a slow electron beam-excited crab light display tube that emits high-intensity blue light and has an accelerating voltage of 100 V or less. This is something that has never been seen before, and its industrial utility value is great.

Next, the present invention will be explained by examples.

Example 1 Zn○・Ga203200 female was supported by a ceramic substrate by the sedimentation coating method using a suspension of 100 cc of distilled water containing 0.01% water glass.
A 9/arc film with a coating density of approximately 10 was formed on a pair of c×1c aluminum anode plates.

Next, a cathode made of a tungsten wire heater coated with oxide was placed facing the crab-light film on the anode plate with an interval of approximately 5 sides, and this pair of electrodes was placed in a hard glass container. After that, the inside of the container was evacuated. After the degree of vacuum in the container reached about 10-5 tons, the exhaust was stopped and the container was sealed, and then the getter was blown off to further increase the degree of vacuum in the container. In this way, a slow electron beam excited crab optical display tube having the structure shown in FIG. 1 was obtained. This low-speed electron beam excited flea light display tube emitted blue light with a luminance of 4 nat-L when the anode plate voltage was 80V, the cathode voltage was 0.6V, and the current was 40A. Example 2 A slow electron beam excited crab light display tube was produced in the same manner as in Example 1, except that (Z~.3, M soft.2) ◯.Ca203 was used as the crab light body.

This slow electron beam excited crab light display tube has an anode plate voltage of 8
When the voltage was 0 V, the cathode voltage was 0.6 V, and the current was 40 A, blue light was emitted with a luminance of 8 t-L. Brief Explanation of the Drawings Figures 1 and 2 are schematic diagrams of typical examples of slow electron beam excited crab light display tubes, with Figure 1 being a diode tube and Figure 2 being a triode tube.

11... Anode plate, 12... Crab light film, 13... Ceramic substrate, 14...
・Cathode, 15... Grid electrode, 16... Container, 1
7...The inside of the display tube kept in a high vacuum.

FIG. 3 is a graph showing the relationship between the anode plate voltage and the luminance of the backlight film in the low-speed electron beam excitation backlight display tube of the present invention.
This shows the case of a203 and (ZnM, M-mo.4)○.Ga203.

FIG. 4 shows a low-speed electron beam-excited light display tube of the present invention using a gallate-based composite oxide light material as a light film, and a Zn○:Zn
This shows the emission spectrum of a conventional low-speed electron beam-excited light display tube with a crab light film, and curves a and b are respectively for Zn○・Ga203 and (Z ratio .6, Mgo.4)○・
This is the emission spectrum of the slow electron beam-excited light display tube of the present invention with Ga203 as the light film, and curve c is for Zn0:Zn.
This is the emission spectrum of a slow electron beam-excited crab light display tube with a crab light film. FIG. 5 shows the slow electron beam excited crab light display tube of the present invention in which the crab light film is made of a gallate-based composite oxide crab light material, and the conventional slow electron beam excited crab light display tube in which the crab light film is made of Zn○:Zn. The emission chromaticity points of the display tube are shown on the CIE color system chromaticity coordinates, and points A and B are Zn○・Ga2, respectively.
03 and (Z~.8, M&.2) ○・Ga203 is the emission chromaticity point of the slow electron beam excited crab light display tube of the present invention, and point C is Zn○: This is the emission chromaticity point of a conventional low-speed electron beam excited light display tube. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] 1. In a low-speed electron beam-excited fluorescent display tube having a structure in which an anode plate having a fluorescent film on one side and a cathode facing the fluorescent film are enclosed in a vacuum container, The film is A(Zn_1_-_x, Mg_x)O.
Ga_2O_3 (however, 0.6≦A≦1.2 and 0≦x≦
0.5), and is characterized in that an accelerating voltage applied to the anode plate is 100 V or less, emitted by slow electron beam excitation in blue light. Fluorescent display tube.