介绍了一种采用只含有会聚场的单透镜的全静电聚焦和偏转系统，这种系统非常适用于制作小型高性能摄象管。
An all-electrostatic focusing and deflecting system characterized by simple lens system is introduced The new system is very useful in producing compact high-performance camera tubes.
与传统的超声波探头相比，超声相控阵探头可以实现电子控制下的声束平移、偏转与动态聚焦。
Compared with traditional ultrasonic probe, ultrasonic phased array probe can realize transition, deflection and dynamic focusing of acoustic beam under electronic control.
第二部分优化设计出多种调节焦长和聚焦偏转的方法，并指出各种方法的相对优势。
The second part optimally designs many kinds of methods about adjustments of focal length and focusing deflection, and points out their relative superiority.
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