公开(公告)号：CA2018071C

公开(公告)日：1995-06-27

申请号：CA2018071

申请日：1990-06-01

Applicant: IBM

Inventor： BUDD RUSSELL A ,  GIBSON BRUCE D ,  KANTOR SHERWOOD ,  OVERBY WAYNE A ,  STANICH MIKEL J

IPC: G02B26/10 ,  B41J2/44 ,  G02B27/00 ,  G03G15/04 ,  G06K15/12 ,  H04N1/053 ,  H04N1/113 ,  H04N1/12 ,  H04N1/19 ,  H04N1/191 ,  G03G13/04

Abstract: This is an electronic scheme for correcting for mechanical misalignment and chromatic aberrations 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 corrected 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：CA1208951A

公开(公告)日：1986-08-05

申请号：CA445886

申请日：1984-01-23

Applicant: IBM

Inventor： HIGGINS ROBERT C ,  STANICH MIKEL J ,  WOLFE LARRY L

IPC: B41J2/44 ,  B41J2/47 ,  G02B26/10 ,  G02B26/12 ,  G02B27/00 ,  G03G15/04 ,  H04N1/113 ,  G02B27/10

Abstract: SOLID-STATE LASER SCANNING SYSTEM An optical system for use with solid state laser chips to counteract variations in wavelength produced by solid-state chips, to counteract astigmatism effects common to laser chips, to counteract variations in the distance between the plane of emission of the beam and the plane of a collimating lens, to counteract variations in beam size in perpendicular planes, to counteract variations in the divergence angle of emission common to laser chips, and to counteract tilt variations caused by imperfect reflecting surfaces. The system includes an apertured achromatic doublet lens for collimating the beam, a cylindrical lens, a rotating mirror, and a combination of toroidal and spherical lens.

公开(公告)号：CA2018931A1

公开(公告)日：1991-02-01

申请号：CA2018931

申请日：1990-06-13

Applicant: IBM

Inventor： BUDD RUSSELL A ,  GODDARD JOAN S ,  STANICH MIKEL J

IPC: H04N1/113 ,  H04N1/191

Abstract: A multiple laser beam scanning optical system for correcting monochromatic and polychromatic abberations comprising a doublet cylindrical lens (25) for receiving the multiple beams and directing them to a rotating polygonal mirror (26). Scanning lens means are located to receive the beams from the mirror and direct them to the image plane (32). The scanning lens (27, 29) is comprised of at least one doublet wherein both elements have approximately the same index of refraction, but different dispersion factors at a nominal wavelength.