| 摘要 |
<p>A raster output scanner (ROS) (10) has a liquid crystal window (30) located at the output of a rotating polygon scanner (26) for correcting the nonuniformity of a light beam (21) which is generated by a laser (12) and modulated by a modulator (20). Separate cells in the liquid crystal window can be controlled individually, so that a variable attenuation to match the curve of the intensity of the light beam, generated by the ROS, can be applied to the light beam. When the light beam with a variable intensity passes through the liquid crystal window of this invention, each cell applies an attenuation to offset the variation in intensity of the light received by that cell. Therefore, the light beam emerging from the liquid crystal window will have a uniform intensity regardless of the variation of the intensity generated by the ROS. <IMAGE></p> |
