Although, Photographic optical lens can be used as objective projected. But Projection objective has some different.
虽然，照相物镜可以用作放映物镜，但放映物镜还是有一些不同之处。
A controller drives the objective lens via a focusing unit, and detects peaks in the reflected light signal obtained when the objective lens is driven in a focusing direction.
控制器经聚焦单元驱动物镜，并且检测在当在聚焦方向上驱动物镜时得到的反射光信号中的波峰。
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