公开(公告)号：US06555952B1

公开(公告)日：2003-04-29

申请号：US09522687

申请日：2000-03-10

申请人： Duk-sung Park ,  Sang-kyun Kim ,  Bong-wook Jung ,  Chul-sik Cho

发明人： Duk-sung Park ,  Sang-kyun Kim ,  Bong-wook Jung ,  Chul-sik Cho

IPC分类号： H01J2948

CPC分类号： H01J29/488

摘要： A final focus electrode includes a cylindrical base on one end and a conical portion on the other end such that the diameter of the conical portion is greater than that of the base and also gradually increases with distance from the base. The conical portion of the final focus electrode is located inside a cylindrical accelerating electrode such that it is coaxially surrounded by the latter.

摘要翻译： 最终聚焦电极包括一端的圆柱形基座和另一端的锥形部分，使得圆锥形部分的直径大于基部的直径，并且随着与基座的距离也逐渐增加。 最终聚焦电极的圆锥形部分位于圆柱形加速电极的内部，使得其由后者同轴地包围。