随着晶体管式和集成电路式示波器的发展,对小型化矩形屏示波管的要求愈来愈迫切了。国内各厂家陆续试制出无后加速型、单级后加速型、螺旋后加速型、发散网型、轴向后加速型、四极透镜扫描放大型以及三圆筒强会聚型等矩形屏示波管。其中产量最大、发展最快的是前四种。由于矩形屏示波管的锥体部分已不再象圆屏管那样旋转轴是对称的。因而对某些偏转后加速型的管子,当偏转后加速电极设计或制作不当时,不易满足傍轴条件,很容易产生光栅图形畸变。图形畸变及畸变系数图形畸变是由于非傍轴电子束受透镜作用,使图象各部分的放大率不能保持一致而出现的一种几何失真图形。所以,图形畸变是一 With the development of transistor and integrated circuit oscilloscopes, the demand for miniaturized rectangular screen oscilloscopes has become more and more urgent. Domestic manufacturers have trial-produced one after another non-accelerated type, single-stage acceleration type, spiral acceleration type, divergence network type, axial acceleration type, quadrupole lens scanning magnification and three cylinder convergence and other rectangular screen tube. One of the largest output, the fastest growing is the first four. Because the rectangular screen tube cone is no longer the same as the circular tube axis of rotation is symmetrical. Therefore, some accelerated tube after deflection, when the acceleration electrode after deflection design or improper manufacture, it is not easy to meet the paraxial conditions, it is easy to produce grating distortion. Pattern distortion and distortion factor Pattern distortion is due to non-paraxial electron beam by the lens, so that the magnification of various parts of the image can not be consistent and appear a geometric distortion pattern. So, the graphical distortion is one