A cover member is mounted in the device body to cover the rotating polygonal mirror.
盖构件安装于装置主体中以覆盖该旋转多面镜。
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.
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。
The inner surface of the plastic indicating head is made into a polygonal mirror surface, so the direction indicating device which can reflect light rays of various angles is very conspicuous.
塑料指示头内表面制成多棱镜面，能反射各种角度的光线，非常醒目。
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