公开(公告)号：BR7705809A

公开(公告)日：1978-06-27

申请号：BR7705809

申请日：1977-08-31

Applicant: IBM

Inventor： SNELL S ,  GIBSON D ,  KUMMLI P ,  ULRICH M ,  DANIELS R

IPC: G03B27/34 ,  G03G15/00 ,  G03G15/041 ,  G03G15/28 ,  G03G21/00 ,  G03G15/04

Abstract: A continuously variable reduction scanning optical system wherein a preferred embodiment is disclosed with mechanisms for continuously adjusting the magnification ratio, the total conjugate length, scan speed, scan length, and leading edge registration. Either a single focus or variable focus lens can be used.

公开(公告)号：BR7508125A

公开(公告)日：1976-08-24

申请号：BR7508125

申请日：1975-12-08

Applicant: IBM

Inventor： DANIELS R ,  KNIGHT A

IPC: G03G15/00 ,  G03G15/06 ,  G03G15/08

Abstract: A magnetic brush developer wherein the bias voltage applied to the brush roll is altered, i.e., reduced, during the transit therepast of the photoconductor drum's seal, thereby reducing the number of magnetic carrier beads which are carried out of the developer on the surface and edges of the drum seal.