公开(公告)号：DE69022148D1

公开(公告)日：1995-10-12

申请号：DE69022148

申请日：1990-06-19

Applicant: IBM

Inventor： GODDARD JOAN STAGAMAN ,  OVERBY WAYNE ARLAN ,  VALENT JAMES ALFRED

IPC: B41J2/44 ,  G03G15/04 ,  G06K15/12 ,  H04N1/053 ,  H04N1/113 ,  H04N1/12 ,  H04N1/191

Abstract: This is an electronic scheme for correcting mechanical misalignment and electrical delays from laser beam to laser beam in the scan direction of a multiple beam laser scanning system for use in an electrophotographic machine. The position at which a reference beam is turned on is sensed and adjusted to a desired position. Thereafter, the positions at which non-reference laser beams are turned on are sensed and adjusted to the desired position. In one embodiment, the energization of laser beams is positioned at the trailing edge of the second element of a photodetector. In a second embodiment, the point of full laser energy is matched, beam to beam, at the junction of the same two elements in a CCD array. Programmable delay lines are used to obtain sub-pel resolution.

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

公开(公告)号：DE69022148T2

公开(公告)日：1996-05-02

申请号：DE69022148

申请日：1990-06-19

Applicant: IBM

Inventor： GODDARD JOAN STAGAMAN ,  OVERBY WAYNE ARLAN ,  VALENT JAMES ALFRED

IPC: B41J2/44 ,  G03G15/04 ,  G06K15/12 ,  H04N1/053 ,  H04N1/113 ,  H04N1/12 ,  H04N1/191

Abstract: This is an electronic scheme for correcting mechanical misalignment and electrical delays from laser beam to laser beam in the scan direction of a multiple beam laser scanning system for use in an electrophotographic machine. The position at which a reference beam is turned on is sensed and adjusted to a desired position. Thereafter, the positions at which non-reference laser beams are turned on are sensed and adjusted to the desired position. In one embodiment, the energization of laser beams is positioned at the trailing edge of the second element of a photodetector. In a second embodiment, the point of full laser energy is matched, beam to beam, at the junction of the same two elements in a CCD array. Programmable delay lines are used to obtain sub-pel resolution.

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.