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普通示波管通常使用球面栅后加速透镜增加偏转灵敏度.但是不使用图象校正器就很难得到小的偏转非线性和光栅畸变.本文给出了设计曲面栅网后加速透镜的方法.只使用后加速透镜就能达到最小的偏转非线性与光栅畸变.其原理是将栅网曲率作的处处改变(变曲率栅网)致使偏转系统象差与后加速透镜象差相互抵削,以得到最小的偏转象差.因此,偏转象差与栅网电极的形状有密切关系.为此首先需采用一个非球面方程的幂级数展开式描写栅网形状,其次考虑到示波管中最重要的三个因数;后加速透镜偏转放大率、偏转非线性及光栅畸变;并选择六个后加速透镜的几何参数作为设计参数,它们之间彼此相关.采用最小二乘法,可以确定最佳结构的设计参数.
Ordinary oscilloscopes usually use spherical retro-acceleration lens to increase the deflection sensitivity, but it is difficult to obtain small deflection non-linearities and raster distortion without the use of image rectifiers.This paper presents a method of designing a surface-accelerated grid lens After using the acceleration lens to achieve the minimum deflection non-linearity and raster distortion.The principle is to change the curvature of the grid everywhere (variable curvature grid) so that the deflection system aberration and post-acceleration lens aberration to each other to get Therefore, the deflecting aberration is closely related to the shape of the grid electrode.To this end, we first need to describe the grid shape by the power series expansion of an aspheric equation, and secondly, the most important Of the three factors; post-acceleration lens deflection magnification, deflection non-linearity and grating distortion; and select the six post-acceleration lens geometry parameters as a design parameter, and they are related to each other using the least squares method to determine the best structure Design Parameters.