A new large area flat CRT consists of a multitude blocks connected in the horizontal direction. For each block a filament cathode is extended in the verticaldirection, a modulation electrode is placed in a parallel position behind the cathode, the vertical addressing electrodes are aligned Perpendicular to the modulation electrodes, and the horizontal deflecting electrodes are placed on either side of the cathode. Because of its simple construction, low production cost may be achieved. This paper reports the improvement method of brightness and spot size Its method carried out by determined to optimum valtage volue applied to vertical addressing electrodes.
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