公开(公告)号：FR2336715A1

公开(公告)日：1977-07-22

申请号：FR7636138

申请日：1976-11-22

Applicant: IBM

Inventor： DAVIE NEIL R ,  LAMBIOTT JOSEPH C

IPC: H04N1/23 ,  B41J2/44 ,  G03G15/04 ,  G06K15/12 ,  H04N1/053 ,  H04N1/113 ,  H04N1/12 ,  H04N1/29 ,  H04N1/407 ,  G03G15/052

Abstract: 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 border area of the photoconductor.