公开(公告)号：DE3889854T2

公开(公告)日：1994-12-08

申请号：DE3889854

申请日：1988-10-07

Applicant: IBM

Inventor： PRAKASH RAVINDER ,  WOLFE LARRY LANCE

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

Abstract: 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：BR8900690A

公开(公告)日：1989-11-14

申请号：BR8900690

申请日：1989-02-17

Applicant: IBM

Inventor： PRAKASH RAVINDER ,  WOLFE LARRY LANCE

IPC: B41J2/44 ,  G02B13/18 ,  G02B26/12 ,  G02B27/00 ,  G01D15/14 ,  G01D9/42

Abstract: A tilt and scan bow error correction system for an electrophotographic printer of the type using a mirror (54) to provide beam scanning across a photoconductor surface (16). An aspheric lens (88) is disposed in the path between said mirror (54) and said photoconductor surface (16) so that said surface is at the conjugate plane to said mirror (56), said lens (88) having a focal length as a function of scan angle, theta , substantially according to the equation f theta = (S/cos theta ) - S /(Dcos theta ) where S is the object distance from said lens (88), the scan origin at said mirror (54) and D is the distance from said photoconductor surface (16) to the scan origin at said mirror (54).

公开(公告)号：DE69114550T2

公开(公告)日：1996-06-20

申请号：DE69114550

申请日：1991-02-07

Applicant: IBM

Inventor： KOMPLIN STEVEN ROBERT ,  PRAKASH RAVINDER ,  WOLFE LARRY LANCE

IPC: G02B27/09 ,  G02B3/02 ,  G02B5/04 ,  G02B27/30 ,  G06K15/12 ,  H04N1/113 ,  G02B27/12 ,  G02B27/00

Abstract: In a laser printer, light beams (4) need to be focused onto a printing surface to form points where print indicia are to effect a print image. In a printer where it is desirable to have variable pitch print characters, a new method has been employed to create variable print character pitches. Multiple non-parallel points of light are emitted through a collimating lens (6) onto a wedge (8) shaped optical component which directs the multiple beams of light into parallel alignment. The optical wedge has one planar surface perpendicular to at least one light beam emitted through the collimating lens. This light beam is normal to the perpendicular planar surface and passes through the wedge without being deflected. The optical wedge also has one or more planar surfaces that direct the other light beams into parallel alignment with the undeflected light beam. By moving the optical wedge away from the collimating lens the pitch (distance) between the light beams is increased and conversely, by moving the optical wedge towards the collimating lens the pitch decreases.

公开(公告)号：DE3889854D1

公开(公告)日：1994-07-07

申请号：DE3889854

申请日：1988-10-07

Applicant: IBM

Inventor： PRAKASH RAVINDER ,  WOLFE LARRY LANCE

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

Abstract: 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：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.