二维计算机模拟验证了彩色显像管电子枪设计中所使用的原理。用可变网络有限差分分析,画出了从阴极到屏幕中心的电子轨迹。在屏幕上,由边缘轨迹和电子束横截面上的电流分布得到了电子束斑的尺寸。把计算结果与三种显像管实测的结果进行比较表明,束斑的水平直径和垂直直径的纵横比一致程度在14％以内或更好。算出的束电流误差约10％。最佳聚焦电压的误差在200伏以内。 Two-dimensional computer simulation validates the principle used in the design of a color picture tube electron gun. Finite difference analysis with variable network, draw the electron from the cathode to the center of the screen. On the screen, the spot size of the electron beam is obtained from the edge locus and the current distribution in the electron beam cross section. Comparing the calculated results with the results of three kinds of tubes shows that the horizontal and vertical aspect ratio of beam spot is within 14% or better. The calculated beam current error is about 10%. The best focus voltage error is within 200 volts.