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公开(公告)号：CA1176745A
公开(公告)日：1984-10-23
申请号：CA397516
申请日：1982-03-03
Applicant: XEROX CORP
Inventor： APPEL JAMES J , CHEN PHILIP L
Abstract: The illumination of a document moving through an exposure zone is maximized by placing a pair of reflectors on each side of the exposure zone in close proximity to the object plane and in an optimum reflecting position in relation to the illumination source. In a first embodiment, utilized in a continuous velocity transport (CVT) system, the reflectors comprise an integral member consisting of a plurality of connected facets. In a second embodiment, wherein the document is moved across a fixed platen, the reflectors effectively consist of two elements including a physically separated extended portion which is formed within the cross section of the platen.
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公开(公告)号：DE69930883D1
公开(公告)日：2006-05-24
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：DE69616879D1
公开(公告)日：2001-12-20
申请号：DE69616879
申请日：1996-06-18
Applicant: XEROX CORP
Inventor： APPEL JAMES J , NACMAN ARON
IPC: H01S5/068 , H01S5/062 , H01S5/0683 , H01S5/40
Abstract: An apparatus and method for efficiently and automatically monitoring and adjusting the power output of laser diodes used to provide the scanning beams in a raster output scanner (ROS) system. Light radiated from the back facet of the laser diode is directed onto at least a pair of back facet photodiodes. The photodiode outputs are proportional to the power output of the laser diode associated with the photodiode. The polarization of the laser diode back facet output is controlled so as to ensure that the only outputs from an associated laser diode is sensed by an associated photodiode. In one embodiment, a half wave plate is used to rotate the polarization of one of the laser diodes and in another embodiment optical fibers efficiently transmit light emitted from the back facets to the photodiode.
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公开(公告)号：CA2046529C
公开(公告)日：1999-03-30
申请号：CA2046529
申请日：1991-07-09
Applicant: XEROX CORP
Inventor： LOCE ROBERT P , APPEL JAMES J
Abstract: A single pass highlight color printing system is enabled by utilizing the disparity between the on-time of a printing system and the on-time of an optical image bar. The image bar output is adapted to be separated into two image outputs which expose two separate areas of a photoreceptor. Each exposed area is developed by a toner of a desired color and the developed image, having two colors thereon, is transferred to a copy sheet to form a two-color output copy.
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公开(公告)号：DE69320599T2
公开(公告)日：1999-03-11
申请号：DE69320599
申请日：1993-12-03
Applicant: XEROX CORP
Inventor： BOCK EDWARD C , APPEL JAMES J
Abstract: In an optical scanning apparatus having an overfilled ROS polygon (24), stray reflection from facets (24R) adjacent the completely filled (illuminated) facet (24A) are prevented from affecting the scan line images by aligning the optical axes (40,50) of the pre-polygon and post-polygon optical components at an optimum angle PHI ' so that the stray light reflections at the photoreceptor (32) occur only at non-image forming scan times (outside the image scan time). The optimum angle PHI ' is expressed by the relationship PHI ' = 2( OMEGA +/- 1/2 theta ) where OMEGA is given by the expression 360/X, X being the number of scanning facets, and theta being the scanning angle.
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Patent Agency Ranking
公开(公告)号：DE69223004T2
公开(公告)日：1998-05-20
申请号：DE69223004
申请日：1992-08-18
Applicant: XEROX CORP
Inventor： APPEL JAMES J , PAOLI THOMAS L
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公开(公告)号：CA2083669C
公开(公告)日：1996-12-10
申请号：CA2083669
申请日：1992-11-24
Applicant: XEROX CORP
Inventor： APPEL JAMES J , DURBIN JOHN A , LEHMAN RICHARD F
Abstract: A color correction method is provided for an electronic printing system that results in a color print that is made as close as possible to what an operator actually observes on a monitor screen (What you see is what you get). The printing system includes a computer, a color printer, and a color monitor. A calibration is automatically performed by the system's computer through the use of calibration software, a series of test patterns stored in the computer memory, a monitor calibrating device, and a scanner equipped with color trichromatic measurement capabilities.
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公开(公告)号：MX9306505A
公开(公告)日：1994-05-31
申请号：MX9306505
申请日：1993-10-20
Applicant: XEROX CORP
Inventor： APPEL JAMES J , NACMAN ARON
Abstract: A raster scanning system includes a beam generator (6) which generates a beam of radiant energy in response to a drive signal. The drive signal comprising a series of pulses. The raster scanning system includes a polygon (4) having an overfilled facet design in which a plurality of facets are at least partially positioned in the optical path of the beam of radiant energy regardless of the rotational position of the polygon. The polygon is adapted to scan a spot across a beam receiving surface. The raster scanning system includes spot size correcting means for maintaining a constant spot size of the scanned spot from start of scan (WSOS) to end of scan (WEOS) by modulating the pulse width of the drive signal provided to the beam generator.
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公开(公告)号：BR9304425A
公开(公告)日：1994-05-10
申请号：BR9304425
申请日：1993-10-29
Applicant: XEROX CORP SOCIEDADE NORTE AME
Inventor： APPEL JAMES J , NACMAN ARON
Abstract: A raster scanning system includes a beam generator (6) which generates a beam of radiant energy in response to a drive signal. The drive signal comprising a series of pulses. The raster scanning system includes a polygon (4) having an overfilled facet design in which a plurality of facets are at least partially positioned in the optical path of the beam of radiant energy regardless of the rotational position of the polygon. The polygon is adapted to scan a spot across a beam receiving surface. The raster scanning system includes spot size correcting means for maintaining a constant spot size of the scanned spot from start of scan (WSOS) to end of scan (WEOS) by modulating the pulse width of the drive signal provided to the beam generator.
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公开(公告)号：CA2068095A1
公开(公告)日：1993-02-20
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 printing apparatus, 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 semiconductor prism, for example of AlGaAs, and have a controllable bias applied thereto to allow further control of spot positioning.
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