根据几何光学原理，推导出转镜-振镜扫描系统物镜前振镜上光斑移动速度的解析表达式。
An analytical expression for spot moving speed on the former vibrating mirror of the polygonal mirror scanning system objective is derived from geometrical optical principle.
最后以设计一个普通的摄像物镜为例，演示了矩阵光学在设计变焦距镜头中的应用。
At last, the application of matrix optics is demonstrated in designing a zoom system of a general camera lens.
物镜，光学拾取器，记录器和重现设备。
Objective lens, optical pickup device, recorder and reproducer.
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