main focusing lens
... auto-focusing lens 自动对焦镜头 main focusing lens 主聚焦透镜 focusing lens plate 自聚焦透镜板 ...
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对近年来大屏幕彩色显像管电子枪专有技术进行了讨论，系统分析了电子束形成区、主透镜、会聚透镜系统及动态聚焦方式等。
In this paper, the specialized techniques of electron gun for large screen CPTs are discussed. The beam forming region, main lens, convergence lens system and dynamic focusing method are analyzed.
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