Dynamic-focus electron gun(DFG)can be used to improve the edge displayproperty of CRT. In this paper,a type of DFG is calculated and analyzed. Static focus characteristic,dynamic focus characteristic,and the quadrupole field are discussed.

• 采用动态聚焦电子枪能够提高CRT的边缘分辨率，本文对一种动态聚焦电子枪进行了计算与分析，并讨论了其静态聚焦特性、动态聚焦特性及四极场的作用。