公开(公告)号：CA2018497C

公开(公告)日：1995-06-27

申请号：CA2018497

申请日：1990-06-07

Applicant: IBM

Inventor： GODDARD JOAN S ,  OVERBY WAYNE A ,  VALENT JAMES A

IPC: B41J2/44 ,  G03G15/04 ,  G06K15/12 ,  H04N1/053 ,  H04N1/113 ,  H04N1/12 ,  H04N1/191 ,  G03G13/04

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 posi? tioned 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：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.