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一、前言静电偏转阴极射线管采取过很多种扫描扩展方案,球形网(dome-shaped mesh)就是其中之一。采用球形网虽然能获得几何畸变小和扫描线性好的显示,但是,由于网与电子束的相互作用,会使束流减小,束点散焦和产生次级发射。采用静电四极透镜(electros-tatic quadrupole)固然可以避免球形网的限制,然而,这种平面对称透镜不能获得像球形网那样出色的几何和线性特性,而且要获得圆形的光点,还需要附加的四极透镜,这就增加了问题的复杂性。
I. Introduction Electrostatic deflection cathode ray tube has taken a variety of scanning expansion program, the dome-shaped mesh (dome-shaped mesh) is one of them. Although the use of spherical mesh can get a small geometric distortion and good linear scanning display, but due to the interaction of the network and the electron beam, the beam will be reduced, beam spot defocus and secondary emission. While the use of electros-tatic quadrupoles avoids the limitations of the sphere, however, this plane-symmetric lens does not provide the same excellent geometrical and linear properties as a sphere, and to obtain a circular spot also requires The additional quadrupole lens adds complexity to the problem.