| 摘要 |
<p>A raster scanning system is disclosed which utilizes a rotating prism (18) for facet tracking. The rotating prism has a plurality of facets (20a-20d, 20a'-20d') and each facet is parallel to an opposite facet. A light beam (14) enters through one facet (20c) of the rotating prism and exits the corresponding parallel facet (20c'). The light beam passing through the rotating prism (18) deflects and since the the prism rotates the light beam also shifts. The prism shifts the light beam in such a manner to keep the beam at the center of a mirror facet (24) of a rotating polygon mirror (22). <IMAGE></p> |
