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公开(公告)号：DE69114550D1
公开(公告)日：1995-12-21
申请号：DE69114550
申请日：1991-02-07
Applicant: IBM
Inventor： KOMPLIN STEVEN ROBERT , PRAKASH RAVINDER , WOLFE LARRY LANCE
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.
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公开(公告)号：DE3482060D1
公开(公告)日：1990-05-31
申请号：DE3482060
申请日：1984-01-02
Applicant: IBM
Inventor： HIGGINS ROBERT CARL , STANICH MIKEL JOHN , WOLFE LARRY LANCE
Abstract: The invention relates to a scanning system for use with solid-state laser chips (200) 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 (201, 202) for collimating the beam, a cylindrical lens (101), a rotating mirror (102), and a combination of toroidal (203) and spherical (204) lenses.
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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
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.
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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
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).
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Patent Agency Ranking
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公开(公告)号：DE3780212T2
公开(公告)日：1993-02-11
申请号：DE3780212
申请日：1987-04-22
Applicant: IBM
Inventor： KANTOR SHERWOOD NMI , SELBY GARRY JOE , WOLFE LARRY LANCE
Abstract: 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.
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公开(公告)号：BR8805812A
公开(公告)日：1989-08-01
申请号：BR8805812
申请日：1988-11-08
Applicant: IBM
Inventor： PRAKASH RAVINDER , WOLFE LARRY LANCE
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.
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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
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.
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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
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.
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