SCANNING SYSTEM AND ERROR CORRECTION FOR SCANNING SYSTEM

摘要

PURPOSE: To correct errors by rotating a polygon, controlling an acoustic optical modulator in accordance with a modulation image signal and supplying corrected exposure to an image plane at every image. CONSTITUTION: Image data which is timed is converted into an analog image signal by an /DA converter 142, The analog image signal is modulated in accordance with a signal on a signal line 156, which is applied to the reference input terminal of the D/A converter 142. During D/A conversion, the image signal corrects a luminance error and generates the modulated image signal. The modulated image signal is outputted to a demodulator driver 146 through a signal line 144. The modulator driver 146 corrects the modulated image signal and makes it to a radio frequency signal whose amplitude is modulated. The signal is transferred to the acoustic optical modulator 112 through a signal line 148. The acoustic optical modulator 112 controls the modulation of a beam 114.