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    5.
    发明专利
    未知

    公开(公告)号：DE69220742T2

    公开(公告)日：1998-01-15

    申请号：DE69220742

    申请日：1992-08-12

    Applicant: XEROX CORP

    Inventor： LOCE ROBERT P ,  CIANCIOSI MICHAEL S ,  WU PETER K ,  BANTON MARTIN E ,  FETH SUSAN E ,  GIRMAY GIRMAY K ,  LAMA WILLIAM L ,  GARCIA KEVIN J ,  SWANBERG MELVIN E

    IPC: B41J2/44 ,  G02B26/10 ,  G02B26/12 ,  G06K15/12 ,  H04N1/113 ,  H04N1/40

    Abstract: A pulsed imaging Raster Output Scanner utilizes pulse width modulation in conjunction with spatial filtering to form three exposure levels at the surface of a recording medium, one of the levels associated with a specific color. In a specific non-facet tracked scanner system, a light beam (84) from a laser source (82) is modulated, by an acousto-optic modulator (92), in accordance with a video signal supplied to the modulator by a control circuit (94). An anamorphic lens system (108) performs a Fourier transform on the modulated beam which is then filtered by a spatial bandpass filter (136) before being directed, by a rotating polygon scanner (142), across the recording medium (162).

    8.
    发明专利
    未知

    公开(公告)号：DE69220742D1

    公开(公告)日：1997-08-14

    申请号：DE69220742

    申请日：1992-08-12

    Applicant: XEROX CORP

    Inventor： LOCE ROBERT P ,  CIANCIOSI MICHAEL S ,  WU PETER K ,  BANTON MARTIN E ,  FETH SUSAN E ,  GIRMAY GIRMAY K ,  LAMA WILLIAM L ,  GARCIA KEVIN J ,  SWANBERG MELVIN E

    IPC: B41J2/44 ,  G02B26/10 ,  G02B26/12 ,  G06K15/12 ,  H04N1/113 ,  H04N1/40

    Abstract: A pulsed imaging Raster Output Scanner utilizes pulse width modulation in conjunction with spatial filtering to form three exposure levels at the surface of a recording medium, one of the levels associated with a specific color. In a specific non-facet tracked scanner system, a light beam (84) from a laser source (82) is modulated, by an acousto-optic modulator (92), in accordance with a video signal supplied to the modulator by a control circuit (94). An anamorphic lens system (108) performs a Fourier transform on the modulated beam which is then filtered by a spatial bandpass filter (136) before being directed, by a rotating polygon scanner (142), across the recording medium (162).

    PULSED IMAGING, PULSE WIDTH MODULATION SCANNER FOR A TRI-LEVEL HIGHLIGHT COLOR IMAGING SYSTEM
    9.
    发明专利
    PULSED IMAGING, PULSE WIDTH MODULATION SCANNER FOR A TRI-LEVEL HIGHLIGHT COLOR IMAGING SYSTEM 未知

    公开(公告)号：CA2077293C

    公开(公告)日：1997-03-25

    申请号：CA2077293

    申请日：1992-09-01

    Applicant: XEROX CORP

    Inventor： LOCE ROBERT P ,  BANTON MARTIN E ,  SWANBERG MELVIN E ,  LAMA WILLIAM L ,  CIANCIOSI MICHAEL S ,  FETH SUSAN E ,  GARCIA KEVIN J ,  WU PETER K ,  GIRMAY GIRMAY K

    IPC: G02B26/10 ,  G02B26/12 ,  G02F1/33 ,  G03G15/01 ,  G06K15/12 ,  H04N1/113 ,  H04N1/40 ,  H04N1/46 ,  H04N1/21

    Abstract: A pulsed imaging, facet tracked, Raster Output Scanner utilizes pulse width modulation in conjunction with spatial filtering to form three exposure levels at the surface of a charged photoreceptor medium, one of the levels associated with a specific color. This type of scanner with a nominal video rendering experiences a color line growth in the process direction. The line growth problem is caused by a coherent optical effect. The resultant output print has bolded color lines in the process direction. Several techniques are set forth to compensate for this line growth. In a preferred technique, the video data stream is modified by locating or positioning video pulses representing white information at the start of an associated pixel time period. When the color pixel is imaged, it will therefore, always abut an adjoining white pulse and will be inhibited from spreading into the adjacent pixel period. Other techniques rely upon inversion of white pulses, or separation of white pulses into two signals, each segment moved to the beginning and the end of the associated pixel period. According to another technique, the input data stream is buffered and pixel groups examined to identify neighboring white and color signals. These signals are then either narrowed or in the case of a sequence of color signals, the lead and trail edge of the color signals are trimmed.

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