Suppression of stray light reflections in a raster output scanner (ROS) using an overfilled polygon design

摘要

In an overfilled ROS polygon architecture, stray reflection from facets adjacent the completely filled (illuminated) facet are neutralized by placing an optical isolator in the path of the unwanted stray reflections. In a first embodiment, the isolator comprises a linear polarizer and a quarter wave plate. In a second embodiment, the isolator comprises a liquid crystal quarter wave plate and a cholesteric liquid crystal cell.