JPS61218055A - Image display device - Google Patents

Abstract

PURPOSE:To maintain a hard vacuum by rapidly adsorbing the gas emitted from the components of an electrode structure including an anode by getters which are installed facing the anode. CONSTITUTION:An electrode group 2 is used to modulate and vertically deflect electrons discharged from a linear cathode 1. The modulated deflected electrons are accelerated while being deflected by a horizontally deflecting electrode 3 and then strike against an anode 4 to make the phosphor emit light. Each electrode 2a of the electrode group 2 facing the anode 4 has slits 5 between which getters 6 are installed. Each of the getters 6 is prepared by pressing and fixing a getter material on a metallic plate and is fixed to the electrode 2a by spot welding. A Zr-V-Fe alloy having a relatively low activation point is used for the getter 6. As a result, the gas produced from the anode 4 due to electronic impact or heating is rapidly adsorbed by the getters 6 installed on the electrodes 2a, thereby suppressing the deterioration of the cathode.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a flat panel image display device in which a getter is installed.

(Prior art) Generally, electron tubes absorb gas emitted from the metal, ceramic, glass, etc. inside the tube to maintain a high vacuum inside the tube and protect the cathode.

Getter material is used inside.

There are two types of getter materials: an evaporative getter that is deposited on the wall (hereinafter referred to as flash) and adsorbs gas, and a non-evaporable getter that is baked at high temperature in a vacuum and then adsorbs the gas. .

The former is represented by a barium getter, and the latter is represented by a zirconium alloy (for example, Zr-1, Zr-V-Fe).

FIG. 2 is a cross-sectional view showing an example of the use of a getter in a conventional flat panel imaging device. Here, a barium getter is used, 21a and 21b are getters, 22a and 22b are barium films, and 23 is a container, 24 is a back electrode, 25 is a terminal, 26
is an anode, 27 is a linear cathode, and 28 is an electrode group.

There are two types of barium getters: wire getters that flash when heated with a single current, and ring getters that heat with high frequency.

The getter 21a is a wire getter with a ring shape facing outward, and is heated with high frequency to flash a barium film 22a on the back surfaces of the container 23 and the back electrode 24.

Further, the getter 21b flashes the barium film 22b onto the inner wall side of the container 23 by heating with electricity.

In the case of an image display device that displays a screen equivalent to 10 inches using the flash method described above, the barium film 22a
, the area of 22b is approximately 300cm" and 10.00
Maintains adsorption amount that can guarantee a life of 0 hours.

(Problems to be Solved by the Invention) In this case, the barium film 22 is formed on the side and back surfaces of the container 23.
When flushing the barium films 22a and 22b, in a large-sized device, the distance between the inside of the electrode assembly, especially the anode 26, which is likely to become a gas generation source, and the barium films 22a and 22b is long;
For an image display device equivalent to 40 inches, the maximum distance is 60
cm, which is about three times longer than 10 inches.

As a result, the gas generated at the anode 26 is not quickly adsorbed by the barium films 22a and 22b, and the gas generated at the anode 26 is not immediately adsorbed by the linear cathode 2.
7 may deteriorate, and reliability may be significantly impaired.

Further, the temperature of the electrode group 28 also increases due to electron bombardment and current flow, and gas is released. In this case as well, in the case of a large-sized image display device, the gas is not adsorbed quickly, which causes deterioration of the cathode 27.

(Means for solving problems) The technical means of the present invention to solve the above problems is as follows.

A non-evaporable getter is provided on at least one anode side of the electrode group.

(Function) When gas is generated from the anode or electrode group and heads toward the cathode, most of the gas will be adsorbed there if the getter is provided facing the anode.

Gases affecting the cathode are significantly reduced.

As a result, even if the image display device becomes larger, it does not take a long time for the gas generated within the electrode structures such as the anode and the electrode to be absorbed, unlike in the case of conventional devices.

It is quickly adsorbed, maintains a high vacuum, and prevents cathode deterioration.

(Example) An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is an exploded view of an electrode structure according to an embodiment of the present invention,
1 is a linear cathode, 2 is an electrode group, 2a is an electrode, 3 is a horizontal deflection electrode, 4 is an anode, 5 is a slit, and 6 is a getter.

Electrons emitted from a linear cathode 1 are modulated and vertically deflected by an electrode group 2, and are finally deflected and accelerated by a horizontal deflection electrode 3, colliding with an anode 4 to cause the phosphor to emit light.

Electrode 2a facing the anode 4 in this electrode group 2
A slit 5 is formed in the slit 5, and a getter 6 is provided between the slits 5.

This getter 6 is a 0.1 mm thick metal plate with a getter material pressed onto it, and is fixed to the electrode 2a by spot welding.

The material for the getter 6 is Zr, which has a relatively low activation temperature.
-V-Fa gold alloy product name used was, for example, SAES Getters St 707).

In general, the Zr-A1 alloy getter (e.g. St 101) used must be heated in vacuum at 900°C for several tens of seconds, or at least at 500°C for several hours in order to exhibit satisfactory adsorption ability. In the case of St 707, it is activated at a minimum temperature of 250°C (however, heating for 1 hour or more is required).

That is, in the baking step, the image display device is evacuated while being heated at 350° C., but the getter 6 is sufficiently activated in this step, and no extra heating step is required.

Furthermore, by providing the getter 6 on the electrode 2a, gas generated from the anode 4 due to electron impact and heating is quickly adsorbed, making it possible to suppress deterioration of the cathode.

(Effects of the Invention) As explained above, the present invention provides a getter on the surface facing the anode, thereby quickly adsorbing gas released from the anode and other electrode structure components and creating a high vacuum. It became possible to keep it.

In addition, by adopting a low-temperature active non-evaporable getter,
The getter can be activated through a baking process, and an activation process after sealing can be omitted.

That is, the present invention has the advantage that it is possible to obtain an image display device with a long life and high reliability, and furthermore, it has become possible to rationalize the manufacturing process.

[Brief explanation of the drawing]

FIG. 1 is an exploded view of an electrode structure according to an embodiment of the present invention, and FIG. 2 is a sectional view showing an example of the use of a getter in a conventional flat panel imaging device. 1... Linear cathode, 2... Electrode group, 2a...
Electrode, 3... horizontal deflection electrode. 4... Anode, 5... Slit, 6 ・
...Getter, 21a, 21b-Getter, 22a, 22b-Barium film. 23... Container, 24... Back electrode, 25... Terminal, 26... Anode, 27... Linear cathode. 28...electrode group. Patent applicant: Matsushita Electric Industrial Co., Ltd. Fig. 1 1...Cathode 0 2...f, MM group 20...1! Pole 3...F1<=i'(Jet al6O-1(AshiE4...
・A No Y 5... Pickpocket, 1-6... Get71

Claims (3)

[Claims] (1) Focusing and deflecting the electron beam emitted from the electron source,
In an image display device comprising an electrode means for modulating and accelerating and colliding with a phosphor to emit light, and a jig for fixing them with precision, the back surface of the electrode means with respect to the electron source, that is, An image display device characterized in that a getter is provided on the phosphor side. (2) The image display device according to claim (1), characterized in that a target is provided at an electrode facing an anode coated with a phosphor, or at a position facing the inside of a jig near the anode. . (3) The image display device according to claim (1), further comprising a getter having an activation temperature lower than the maximum temperature during the baking process of the image display device.