公开(公告)号：DE69119466D1

公开(公告)日：1996-06-20

申请号：DE69119466

申请日：1991-02-21

Applicant: IBM

Inventor： GIBSON BRUCE DAVID

IPC: G03G15/04 ,  B41J2/44 ,  G06K15/12 ,  G06K15/14 ,  H04N1/113 ,  H04N1/23

Abstract: In an electrophotographic printer, a moving laser beam (25) scans a photoconductor (10) as the beam is selectively modulated by the operation of a beam modulator (22). Binary print data (38) is gated to the modulator by the operation of a picture element (PEL) clock. At the beginning of each photoconductor scan, the beam traverses an optical grating that is constructed and arranged to produce a grating clock signal whose frequency and phase are accurately related to the later position of the beam during each photoconductor scan. A controllable delay means is controlled by the grating clock signal. For the scanning of each photoconductor row, the delay means operates to bring the phase of the PEL clock into synchronism with the grating clock signal, prior to the time that the beam scans the photoconductor.

公开(公告)号：DE69119466T2

公开(公告)日：1996-11-21

申请号：DE69119466

申请日：1991-02-21

Applicant: IBM

Inventor： GIBSON BRUCE DAVID

IPC: G03G15/04 ,  B41J2/44 ,  G06K15/12 ,  G06K15/14 ,  H04N1/113 ,  H04N1/23

Abstract: In an electrophotographic printer, a moving laser beam (25) scans a photoconductor (10) as the beam is selectively modulated by the operation of a beam modulator (22). Binary print data (38) is gated to the modulator by the operation of a picture element (PEL) clock. At the beginning of each photoconductor scan, the beam traverses an optical grating that is constructed and arranged to produce a grating clock signal whose frequency and phase are accurately related to the later position of the beam during each photoconductor scan. A controllable delay means is controlled by the grating clock signal. For the scanning of each photoconductor row, the delay means operates to bring the phase of the PEL clock into synchronism with the grating clock signal, prior to the time that the beam scans the photoconductor.

公开(公告)号：BR9003727A

公开(公告)日：1991-09-03

申请号：BR9003727

申请日：1990-07-31

Applicant: IBM

Inventor： BUDD RUSSELL ALAN ,  GIBSON BRUCE DAVID ,  KANTOR SHERWOOD ,  OVERBY WAYNE ARLAN ,  STAINICH MIKEL JOHN

IPC: G02B26/10 ,  B41J2/44 ,  G02B27/00 ,  G03G15/04 ,  G06K15/12 ,  H04N1/053 ,  H04N1/113 ,  H04N1/12 ,  H04N1/19 ,  H04N1/191

Abstract: This is an electronic scheme for correcting for mechanical misalignment (41) and chromatic aberrations (42) from laser beam to laser beam in the scan direction of a multiple beam laser scanning system for use in an electrophotographic machine. Each beam is first corrected for mechanical misalignment and thereafter for chromatic aberrations. A reference laser beam produces two pulses near the start of scan (SOS) and two pulses near the end of scan (EOS). A non-reference laser beam then produces SOS and EOS pulses from which the mechanical misalignment is calculated. A gated clock is energized by the reference pulse and a tapped delay line is used for nanosecond resolution. After accomplishing correction for mechanical misalignment, chromatic aberrations are correctected by measuring the amount of total pel displacement of the non-reference scan line relative to the reference scan line and inserting appropriate delays at selected intervals throughout the non-reference scan in order to maintain pel placement accuracy to a desired tolerance.

公开(公告)号：PE991A1

公开(公告)日：1991-01-26

申请号：PE17255590

申请日：1990-07-24

Applicant: IBM

Inventor： GIBSON BRUCE DAVID ,  BUDD RUSSELL ALAN ,  STANICH MIKEL JOHN ,  KANTOR SHERWOOD ,  OVERBY WAYNE ARLAN

IPC: G02B26/10 ,  B41J2/44 ,  G02B27/00 ,  G03G15/04 ,  G06K15/12 ,  H04N1/053 ,  H04N1/113 ,  H04N1/12 ,  H04N1/19 ,  H04N1/191

Abstract: CARACTERIZADO POR REFERIRSE A UN ESQUEMA ELECTRONICO PARA LA CORRECCION DE LAS DESALINEACIONES MECANICOS Y LAS OBSERVACIONES CROMATICOS EN UN HAZ LASER A OTRO DE LA DIRECCION DEL BARRIDO DEL SISTEMA DE RAYOS LASER DE HACES MULTIPLES, A SER UTILIZADO EN UNA MAQUINA ELECTROFOTOGRAFICA