本文描述了正交电磁场中电子光学问题求解方法的原理。数字程序使正交场枪及聚焦系统的设计和评价成为可能,其精度与解题能力很高。与其他程序不同,问题边界内的空间布满了由计算机所建立的象张开的渔网样的不规则三角形网格,并且就在这些网格上求解泊松方程。一般来说,靠近阴极区域所使用的新颖逼近方法,能使解的精度显著改善。 This paper describes the principle of solving the problem of electronic optics in the orthogonal electromagnetic field. Digital programs make it possible to design and evaluate orthogonal field guns and focusing systems with high accuracy and problem-solving skills. Unlike other programs, the space within the bounds of the problem is covered with computer-created, fish-like irregular triangular meshes, and the Poisson equation is solved on these grids. In general, the new approach to approximating the cathode area leads to a significant improvement in the accuracy of the solution.