| 摘要 |
An optical element for laser beam deflection in a raster output scanner (ROS) of an electrophotographic printer. The optical element (50) includes a chamber (54) containing a ferroelectric liquid crystal material having a variable index of refraction as a function of voltage applied thereacross. The ROS includes a control system coupled to a voltage source (58) for applying a voltage across the electrodes (53,57) of the optical element to control the variable index thereof in conjunction with the rotation of the polygon. This enables the beam to be positioned on a selected portion of each facet of the polygon as the polygon rotates, as well as compensating for facet alignment errors and/or belt motion errors. <IMAGE> |
