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在以2:1隔行扫描1125行、60场/秒为基础的高清晰度电视系统中,用于实况彩色摄象的1英寸硒砷碲光导层的高分辨力电视摄象管已研制成功。利用电子束无交叉点的二极式电子枪,完全证实了硒砷碲光导靶固有的高分辨能力。由于在正偏置的G_1圆盘电极上应用了直径约为12微米的细小限束孔,所以,从平面钡浸渍钨阴极发射出的电子形成了高电流密度、低束温的狭窄层流电子束。该管具有卓越的分辨力和低的惰性,同时在宽带视频信号系统中,为了处理0.5微安标准峰值信号电流需要具有相当高信噪比的足够束电流余量。本文还讨论了是否可把这种设计概念应用到标准电视系统用管的问题。
High-definition television cameras for 1-inch selenium-arsenic telluride photoconductive layers for live color photography have been developed in a 2: 1 interlaced 1125-line, 60-field / second based high definition television system. The use of a two-electrode electron gun without an intersecting electron beam completely confirms the inherent high resolving power of the selenium arsenide telluride photoconductive targets. Due to the small confinement hole with a diameter of about 12 μm applied to the positively biased G_1 disk electrode, electrons emitted from the planar barium-impregnated tungsten cathode form a narrow, laminar flow of electrons with high current density and low temperature bundle. The tube offers excellent resolution and low inertia while requiring sufficient beam current margin with a fairly high signal-to-noise ratio in a wideband video signal system to handle 0.5 microamp standard peak signal current. This article also discusses the issue of whether this design concept can be applied to standard TV system tubes.