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公开(公告)号：CA2067887A1
公开(公告)日：1993-02-06
申请号：CA2067887
申请日：1992-05-01
Applicant: XEROX CORP
Inventor： APPEL JAMES J , OSSMAN KENNETH R
Abstract: Compensation for process direction motion of a photoreceptor (24) in a Raster Output Scan system is provided by moving the cylinder lens (16) located between the laser source (12) and a rotating spot scanning mechanism, e.g., a polygon (20). The cylinder lens is moved in the process direction in response to error signals generated by a start of scan (SOS) detector (30) and timing marks (34) on the photoreceptor drum surface, or an encoder on the drum shaft. The lens movement is obtained by sending motion error signals to a piezo-electric actuator (18) which increases in length to impart the desired motion to the cylinder lens.
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公开(公告)号：CA2046529A1
公开(公告)日：1992-02-02
申请号：CA2046529
申请日：1991-07-09
Applicant: XEROX CORP
Inventor： LOCE ROBERT P , APPEL JAMES J
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公开(公告)号：DE69930883T2
公开(公告)日：2006-08-31
申请号：DE69930883
申请日：1999-01-04
Applicant: XEROX CORP
Inventor： APPEL JAMES J , NOWAK WILLIAM J
Abstract: Correcting color banding problems resulting from facet-to-facet (102) jitter in a color imaging device having a multifaceted polygon (100) are corrected by starting each color separation using the same facet. This facet synchronization has been shown to reduce the objectionable color banding. Imaging offsets that result from either advancing or retarding the exposure of a latent image such that the latent image begins with the same facet as other latent images are compensated for using a rotating cylinder mirror (112) whose rotation is controlled by a piezoelectric element (150).
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公开(公告)号：DE69930882T2
公开(公告)日：2006-08-31
申请号：DE69930882
申请日：1999-01-04
Applicant: XEROX CORP
Inventor： APPEL JAMES J
Abstract: Color banding resulting from facet-to-facet jitter in a color imaging device having a plurality of multifaceted polygons (100) is reduced by matching the facets (102) of the various polygons (100) such that the composite image produced by the matched facets result in minimal color banding. The latent images are registered by starting each latent image with a selected "starting" facet (102) such that the matched facets trace corresponding scan lines. Imaging offsets that would result from either advancing or retarding the exposure of a latent image such that the latent images begin with the correct facet are compensated for by moving a rotating cylinder mirror (112) such that the latent images are registered. Moving of the cylinder mirror (112) is beneficially achieved using a controlled piezoelectric element (150).
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公开(公告)号：DE69901264D1
公开(公告)日：2002-05-23
申请号：DE69901264
申请日：1999-01-04
Applicant: XEROX CORP
Inventor： NOWAK WILLIAM J , BOCK EDWARD C , APPEL JAMES J
Abstract: Correcting motion quality induced color banding problems resulting from photoreceptor motion defects in a color imaging device having a laser based multifaceted polygon (100) and a rotating cylindrical mirror (112) whose rotation is set by a controlled rotation inducing element (150). A motion sensor (200) senses the motion of the photoreceptor. Based upon motion errors a controller (121) either advances or delays the production of a latent image. The controller further controls the rotation inducing element (150), beneficially a piezoelectric element, such that a latent image is produced in a predetermined location. When multiple latent images are produced, the controller beneficially causes the latent images to be properly registered.
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Patent Agency Ranking
公开(公告)号：DE69420534D1
公开(公告)日：1999-10-14
申请号：DE69420534
申请日：1994-12-20
Applicant: XEROX CORP
Inventor： APPEL JAMES J , PAOLI THOMAS L , BRUEGGEMANN HARRY P , FISLI TIBOR , NACMAN ARON
IPC: G02B26/10 , B41J2/47 , G02B26/08 , G02B26/12 , G02B27/00 , G02F1/29 , G06K15/12 , H04N1/047 , H04N1/113 , H04N1/12
Abstract: Facet-to-facet pyramidal wobble is corrected without resorting to cylindrical optics by adapting agile beam concepts to provide real-time control of the light beam position on the photoreceptor. The agile beam is provided by either or both of a variable wavelength light source (202) or a variable index of refraction prism (232). The position of the light beam is determined by either or both of a super linear position detector (224) directly detecting the position of the light beam, or a facet detector (234) and a look-up table for indirectly estimating the position of the light beam. By actively compensating for pyramidal wobble, the passive but expensive and difficult-to-position cylindrical optics can be replaced with cheap and easy-to-position spherical optics (204, 218).
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公开(公告)号：CA2068095C
公开(公告)日：1998-02-24
申请号：CA2068095
申请日：1992-05-06
Applicant: XEROX CORP
Inventor： APPEL JAMES J , PAOLI THOMAS L
IPC: G02B26/10 , G02B26/12 , G06K15/12 , H04N1/047 , H04N1/113 , H04N1/12 , B41J2/435 , H01S3/07 , B41J2/44
Abstract: In an optical output device wherein a beam of light is generated and focused to a spot upon an image plane, such as a photoreceptor in a xerographic printingapparatus, an apparatus for controlling the position of the spot in the slow scan direction of the image plane including a light source capable of emitting the beam of light at a selected one of at least two selectable wavelengths and beam deflecting means for deflecting the beam of light an amount which depends on the wavelength of the beam of light, the amount of deflection determining the position of the spot in the slow scan direction on the image plane. The light source may be of the solid state laser type, and may emit a plurality of beams of light the spots from which may be individually or together selectively positioned in the slow scan direction on the image plane. The beam deflecting element may be a semiconductorprism, for example of AlGaAs, and have a controllable bias applied thereto to allow further control of spot positioning.
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公开(公告)号：DE69310119T2
公开(公告)日：1997-11-13
申请号：DE69310119
申请日：1993-11-29
Applicant: XEROX CORP
Inventor： APPEL JAMES J , DURBIN JOHN A , ANDREWS JOHN R
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公开(公告)号：DE69222604D1
公开(公告)日：1997-11-13
申请号：DE69222604
申请日：1992-07-09
Applicant: XEROX CORP
Inventor： APPEL JAMES J , OSSMAN KENNETH R OSSMAN KENNET
Abstract: Compensation for process direction motion of a photoreceptor (24) in a Raster Output Scan system is provided by moving the cylinder lens (16) located between the laser source (12) and a rotating spot scanning mechanism, e.g., a polygon (20). The cylinder lens is moved in the process direction in response to error signals generated by a start of scan (SOS) detector (30) and timing marks (34) on the photoreceptor drum surface, or an encoder on the drum shaft. The lens movement is obtained by sending motion error signals to a piezo-electric actuator (18) which increases in length to impart the desired motion to the cylinder lens.
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公开(公告)号：DE69310301D1
公开(公告)日：1997-06-05
申请号：DE69310301
申请日：1993-09-20
Applicant: XEROX CORP
Inventor： APPEL JAMES J , PAOLI THOMAS L , FISLI TIBOR
IPC: B41J2/44 , B41J2/45 , B41J2/455 , B41J2/47 , G02B26/10 , G02B26/12 , G03G15/01 , G06K15/12 , H04N1/113 , H04N1/04
Abstract: A raster output scanner (ROS) laser diode architecture enables a plurality of laser diodes (3,4,6 and 8), which produce light beams at separated wavelengths, to be spaced a convenient distance apart for a multistation printer, by arranging the diodes in a line that is parallel to the fast scan direction of the ROS. Wavelength discriminating optics (32,34,46) are used to separate and reflect the light beams reflected from a single ROS polygon mirror (24). These separated and reflected beams then expose their associated photoreceptors (58,60,62,64), or respective portions of a single photoreceptor, with a rasterized image that is subsequently transferred to a support medium such as plain paper and developed into an image.
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