FEEDBACK CONTROL FOR LASER DISCHARGE SYSTEM

摘要

FEEDBACK CONTROL FOR LASER DISCHARGE SYSTEM In a xerographic printer wherein an acousto-optic modulator is used to derive a deflected first-order beam of electromagnetic power which raster scans a charged photoconductor to leave a selectively discharged latent image area bordered by a discharged border area; power contents of said first order beam is maintained constant by adjusting the efficiency of the acousto-optic modulator with a closed loop electrical control system. The efficiency of the acousto-optic modulator is adjusted only when the beam is scanning the discharged border area of the photoconductor. By providing a means which allows the power contents of the first order beam to be constant the quality of copies are significantly improved.