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一种新型双束投影管已开发成功 ,它具有这些优点 :在分辨率相同时 ,其亮度几乎是传统投影管的两倍 ,换句话说 ,在亮度相同时 ,分辨率比传统投影管高的多 ,并且能够减少由于过载导致的对荧光屏的损伤。所有这些优点都是由于在扫描期间 ,由双重电子束轰击每个象素两次的结果。本文研究的新技术 :一项是为了消除电子光学系统中的象散 ,在静电聚焦P_CRT双束投影管中采用的新设计方案。另一项是为了使驱动两电子束的两个图象信号同步 ,而采用的数字延时电路。本设计原理也能适用于多束P_CRT。
A new dual-beam projection tube has been developed that offers the following advantages: at twice the resolution at the same brightness as traditional projection tubes; in other words, at the same brightness, the resolution is higher than with traditional projection tubes And can reduce damage to the screen due to overload. All of these advantages are due to the double electron beam bombardment of each pixel twice during scanning. The new technology studied in this paper: one is to eliminate the astigmatism in the electron optical system, and the new design adopted in the electrostatic focus P_CRT double-beam projection tube. The other is a digital delay circuit used to synchronize the two image signals driving the two electron beams. The design principle can also be applied to multi-beam P_CRT.