Reduction of the focus hole diameter strongly affects the electrons with large emission angle but its influence on electronfocusing is less markedly than the influence of the variations in potential.
减小聚焦极孔径对大发散角的电子有影响，但对聚焦作用的影响不如改变电位明显。
2
This article points out the inadequacies in the principles of focusing on the electron in the book "electron Survey" Meanwhile, it discusses and amends them in greater detail.
指出《电子测量》一书关于示波器聚焦原理论述的不足，并针对这一问题进行较详细的讨论和补充。
3
The focusing performance of electron gun is decided by the structure of electrodes.