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：CA1317996C

公开(公告)日：1993-05-18

申请号：CA577723

申请日：1988-09-16

Applicant: IBM

Inventor： PRAKASH RAVINDER ,  WOLFE LARRY L

IPC: G02B26/10 ,  B41J2/44 ,  G06K15/12 ,  G03G15/04

Abstract: YO987-052 An image scanning apparatus for use on a laser electrophotographic printer provides improved imaging in both the scan and process direction in a printer using a multiple spot printhead.

公开(公告)号：CA1301511C

公开(公告)日：1992-05-26

申请号：CA582758

申请日：1988-11-10

Applicant: IBM

Inventor： PRAKASH RAVINDER ,  WOLFE LARRY L

IPC: B41J2/44 ,  G02B13/18 ,  G02B26/12 ,  G02B27/00 ,  G03G15/04 ,  G02B26/10 ,  G06K15/14

Abstract: An aspheric lens exhibiting varying optical power as a function of location along the longitudinal axis of the lens is intended for use in an electrophotographic printer of the type having a mirror for providing tilt error and scan bow error correction of a laser beam to be imaged at a photoconductor surface.

公开(公告)号：CA1273676A

公开(公告)日：1990-09-04

申请号：CA534658

申请日：1987-04-14

Applicant: IBM

Inventor： KANTOR SHERWOOD ,  SELBY GARRY J ,  WOLFE LARRY L

IPC: B41J2/44 ,  B41J2/52 ,  G03G15/00 ,  G03G15/22 ,  G06K15/12 ,  H04N1/23 ,  H04N1/40 ,  H04N1/409

Abstract: COMPENSATION FOR FINE LINE PRINTS In an electrophotographic printer or the like, compensation is provided for environmental effects (temperature, humidity, photoconductor aging, etc.) which would otherwise affect print quality. Analyzing print data allows identification of compensation locations; those are locations at which compensation is most critical, such as single pel lines. A series of clock pulses of varying phase displacement are employed, and selected based on environmental variations, so as to modify the print data at the identified compensation locations. The print data comprises a series of pulses. Compensation to control the width of lines perpendicular to the scan direction is effected by selectively advancing the leading edge of pulses defining a white/black transition and delaying the trailing edge of pulses defining the black/white transition. This control then affects the duration of the print pulses. For lines which are parallel to the scan direction width control is effected by adding gray pulses, both the leading and trailing edges of these gray pulses are controlled in accordance with environmental variations. Accordingly, the duration of the gray pulse is also controlled.