A cover member is mounted in the device body to cover the rotating polygonalmirror.
盖构件安装于装置主体中以覆盖该旋转多面镜。
2
An analytical expression for spot moving speed on the former vibrating mirror of the polygonalmirror 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。
3
The inner surface of the plastic indicating head is made into a polygonalmirror surface, so the direction indicating device which can reflect light rays of various angles is very conspicuous.