SU776385A1 - Cathode-ray device - Google Patents

Abstract

1. ELECTRON-BEAM DEVICE, containing an electron gun, an image scanning system made in the form of deflecting plates, an electron trap and a screen, characterized in that, in order to improve the image quality on the screen at high scanning speeds, at least one of the plates is complete with an electron-transparent region in the region of intersection of the scanning plane with the surface of the plate. 2. The device according to p. 1, cast; asyush and with the fact that the specified area is located in the form of a slit, on which a fine-grain grid is installed. (L

Description

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This invention relates to the field of electronic technology and can be & Used in the development of electron-optical converters (EOC) for g analysis of fast processes. An EOC is known, containing a translucent photocathode, a focusing electrode, an anodic diaphragm, an electronic shutter in the form of two pairs of deflecting plates separated by a shutter, a image scanning system in the deflector plates and a fluorescent screen.

The disadvantage of the named EOP is the ir with a low temporal resolution, ojffia of the reasons for which is the low resonant frequency (about 300 MHz) of the scanning system, which is a deflection plate with pin-in pins.

The closest to the predlb: eikomu is an electron-beam device containing an electron gun, an image scanning system, made 25 in the form of deflecting plates, an electron gun, and an ecran.

This device allows you to receive; rather high sweep speeds, however, it does not ensure the high image quality on the screen due to the difficulty of creating a liquefied pressure on the screen. To improve the image quality, voltage pulses with an increased amplitude must be formed and only a part of the pulse used that gives a control voltage change that is close to linear, But the electron beam usually touches the deflection plates, which leads to the appearance of secondary electrons and their parasitic illumination of the screen, reducing the image quality .45

The aim of the invention is to improve the image quality on the screen at high scanning speeds. This goal is achieved by the fact that in an electron beam device containing an electron. a throne gun, an image sweep system made in the form of deflecting plates, an electron trap and a screen, at least one of the plates is made with a transparent for the electron beam section in the region of intersection of the scanning plane with the plane of the plate. The specified section can be made in the form of a slit, on which a fine-grain grid is installed.

FIG. 1 shows a diagram of the proposed device; in fig. 2 is a view along arrow A in FIG. one.

It consists of a photocathode 1, an accelerating electrode 2, a focusing electrode 3, an anode diaphragm 4, an electronic shutter 5, a scanning system 6, an electronic trap 7, a shield 8. At least one of the plates of the scanning system has a section 9 that is transparent to the electron beam . In the process of scanning the image, after the electron beam leaves the working area of the screen, it enters an electron trap, which serves to eliminate the screen illumination by electrons reflected from the walls of the image intensifier tube. With a further increase in naire on the plates, the deflected beam passes through the slit in the plate, which is transparent to the electron flow, which prevents the electron reflected from the plate from entering the screen.

As shown by tests of prototype EOPs made in accordance with the above described invention, with a section in a deflecting plate in the form of a coiled (along an electron beam) grid with transparency to an electron flow of about 90% (8 μm tungsten wire), the parasitic illumination of the screen is almost eliminated That is, the quality of the image has become significantly higher.

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Claims (2)

1. ELECTRON BEAM DEVICE, comprising an electronic gun, an image scanning system made in the form of deflecting plates, an electronic trap and a screen, characterized in that, in order to improve the quality of the image on the screen at high scanning speeds, at least one of the plates made with a section that is transparent to the electron beam at the intersection of the scan plane with the surface of the plate. 2. The device pop. 1, l and m of h ^and u, and d ^yu_ with I wherein said portion vypblnen.v a slot in which is set a fine-mesh £. "Hm ¹ m m o 385 1 .........