公开(公告)号：HK1009568A1

公开(公告)日：1999-06-04

申请号：HK98110306

申请日：1998-08-31

Applicant: IBM

Inventor： BUDD RUSSELL ALAN ,  KARIDIS JOHN PETER ,  MCVICKER GARARD

IPC: H04M1/02 ,  H04B

公开(公告)号：CA2018931C

公开(公告)日：1995-09-26

申请号：CA2018931

申请日：1990-06-13

Applicant: IBM

Inventor： BUDD RUSSELL ALAN ,  GODDARD JOAN STAGAMAN ,  STANICH MIKEL JOHN

IPC: H04N1/113 ,  H04N1/191 ,  G03G15/22 ,  G02B26/12

Abstract: A multiple laser beam scanning optical system for correcting monochromatic and polychromatic aberrations comprising a doublet cylindrical lens for receiving the multiple beams and directing them to a rotating polygonal mirror. Scanning lens means are located to receive the beams from the mirror and direct them to the image plane. The scanning lens 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.