论文部分内容阅读
引言摄象管采用磁聚焦能够将电子束会聚成束扩散极小的细小光点,因此容易获得高分辨率。但是在磁聚焦场中,电子束偏转不可避免地使电子束产生螺旋状扭转,因而严重地降低了摄像管的性能。本文的目的是了解电子束的扭转运动,以改善摄像管中由于扭转运动而引起的一些特性,如光点和光栅畸变,电子束着靶误差等等。为了消除电子束偏转后的扭转运动,采用了“双重偏转”技术,双重偏转的计算结果与实验测试结果相一致,这一技术保证了电子束正确地着靶。
Introduction With the use of magnetic focusing, the tube can converge the electron beam into tiny spots with very small beam spreads, making it easy to obtain high resolution. However, in a magnetic focusing field, the electron beam deflection inevitably causes the electron beam to spirally twist, thereby seriously deteriorating the performance of the image pickup tube. The purpose of this paper is to understand the twisting motion of the electron beam to improve some of the characteristics of the camera tube caused by torsional motion such as spot and raster distortion, electron beam target errors, and so on. In order to eliminate the twisting movement after electron beam deflection, the “double deflection” technology is used. The calculation result of double deflection is consistent with the experimental test results. This technique ensures that the electron beam is correctly positioned.