JPS6210844A - Electron beam display device - Google Patents

Abstract

PURPOSE:To prevent deposition of charges as the exposed part of an insulation base plate, by providing a shield electrode covering the insulation base plate between the first and the second deflection electrodes. CONSTITUTION:A shield electrode 16 is composed of a flat part 16a which is welded for connection on the first deflection electrode 10 on the cathode side and a shield part, namely a L projection, which covers the exposed part 15 of an insulation base plate 12 with a predetermined gap to prevent discharge between a shield part 16b and the second deflection electrode 11. As a result, deposition of charges at the exposed part 15 of the insulation base plate 12 is prevented. Therefore, lack of light emission intensity and degraded deflection of electron beam are also eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] The present invention relates to an improvement in a display device using an electron beam.

A conventional display device of this type, which is an object of improvement of the present invention, will be explained with reference to FIG. 1 is a glass face plate, 2 is a side wall, and 3 is a metal back plate, and an internal space 4 of the container surrounded by these forms a vacuum. 5 is an anode consisting of a back metal and a phosphor layer formed by coating on the inner surface of the face plate 1; 6 is a cathode electrode plate attached to the metal back plate 3; and 7 is a linear cathode that emits an electron beam 14. .

Reference numerals 8a18b and 8c denote thin control electrode plates, which have holes of a predetermined size through which the electron beam 14 passes, and control the amount, time, etc. of the electron beam 14 passing therethrough using image signals.

Note that the control voltage application electrode is not shown. Reference numeral 9 denotes an insulating spacer that holds the control electrode plates 8a18b and 8c at a predetermined distance.

First and second deflection electrodes 10 and 11 to which a high voltage is applied are formed of nickel metallization on an insulating substrate 12 made of glass with a distance d between them. The insulating substrate 12 is supported between the anode 5 and the insulating spacer 9 by an anode support plate 13 made of a thin metal plate. The electron beam 14 that has passed through the control electrode plate 8JL% 8BS 8C and has been modulated and controlled is accelerated and deflected by the deflection electrodes 10 and 11, collides with the anode 5, and emits light.

By the way, in the above-mentioned conventional device, the electrons scattered around the electron beam 14 adhere to the exposed portion 15 (the portion with the distance d) of the insulating substrate 12 between the deflection electrodes 10 and 11, and the electrons scatter around the deflection electrode 10. When applying a high voltage of 5 to 10 KV to the .11, discharge may occur at 2 to 3 KV before reaching the specified high voltage, which may damage the high voltage output circuit and cause the specified high voltage to Problems such as insufficient luminance and defective deflection of the electron beam occur due to the inability to apply the electron beam. It is an object of the present invention to solve this problem and provide an electron beam display device that is free from such a phenomenon.

[Structure of the Invention] The electron beam display device of the present invention includes a linear cathode that emits an electron beam, a control electrode that controls and modulates the electron beam, and an electron beam that accelerates and modulates the electron beam controlled and modulated by the control electrode. In an electron beam display device comprising first and second deflection electrodes that deflect, and a face plate that includes an anode that emits light upon collision of an electron beam accelerated and deflected by the deflection electrodes,
The first and second deflection electrodes are formed on an insulating substrate at a predetermined interval, and have an L-shaped protruding shielding portion that covers the exposed portion of the insulating substrate at the interval. It is characterized in that the flat part of the shield electrode is welded and joined to the first deflection electrode on the cathode side.

An embodiment of the invention will be described with reference to FIG.

In the same figure, parts 1 to 15 are the same as the conventional one shown in FIG. 2, so their explanation will be omitted.

In the present invention, an insulating substrate 1 between the first and second deflection electrodes 10 and 11 having a thickness of about 10 μm is formed on an insulating substrate 12 made of glass by vapor deposition or thermal spraying of nickel.
In order to prevent electric charge from accumulating in the exposed portion 15 of the electrode 2, a shielding electrode 16 is provided to cover the exposed portion 15. This shielding electrode 16 has a flat part 16a that is welded and connected to the first deflection electrode 10 on the cathode side, and an L-shaped shield that protrudes and covers the exposed part 15 of the insulating substrate 12 at a predetermined interval. The shielding part 16b and the second
This is to prevent discharge from occurring between the deflection electrode 11 and the deflection electrode 11. This shielding electrode 16 is arranged along the first deflection electrode 10, and when it is divided into several parts in the longitudinal direction, the insulating substrate 1
It is possible to prevent thermal distortion during manufacturing due to the difference in the materials between the shield electrode 16 and the shield electrode 16, thereby facilitating installation.

[Effects of the Invention] As described above, in the electron beam display device of the present invention, by providing the shielding electrode 16, the insulating substrate 12 between the first deflection electrode 10 and the second deflection electrode 11 is exposed. Accumulation of charge in the portion 15 can be prevented. Therefore, all the problems that the conventional device shown in FIG. 2 suffers from due to the accumulated charges can be solved, thereby achieving the object of the invention. Further, the shielding electrode 16 has a simple structure, can be easily manufactured by sheet metal processing, and is easy to attach, so it has the advantage that it can be provided at low cost.

[Brief explanation of the drawing]

Fig. 1: A sectional view of an embodiment of the electron beam display device of the present invention Fig. 2: A sectional view of a conventional electron beam display device 1...Face plate, 2...Side wall, 3...Metal back plate , 4... Internal space, 5... Anode, 6... Cathode electrode plate, 7... Linear cathode, 8C% 8 b
s 8C...Control electrode plate, 9--Insulating spacer, 10
...first deflection electrode, 11...second deflection electrode, 12.
... Insulating substrate, 13... Anode supporting plate, 14... Electron beam, 15... Exposed portion of insulating substrate, 16.
...shielding electrode, 16a... flat part, 16b... shielding part

Claims (1)

[Claims] A linear cathode that emits an electron beam, a control electrode that controls and modulates the electron beam, and first and second deflection electrodes that accelerate and deflect the electron beam controlled and modulated by the control electrode. In an electron beam display device comprising a face plate having an anode that emits light upon collision of an electron beam accelerated and deflected by the deflection electrode, the first and second deflection electrodes are arranged on a predetermined insulating substrate. The flat part of the shield electrode has an L-shaped protruding shield part that covers the exposed part of the insulating substrate at the interval, and the flat part of the shield electrode is connected to the first deflection electrode on the cathode side. An electron beam display device characterized by being welded and joined to