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    3.
    发明专利
    未知

    公开(公告)号：DE69518875T2

    公开(公告)日：2001-02-22

    申请号：DE69518875

    申请日：1995-06-06

    Applicant: XEROX CORP

    Inventor： MAEDA PATRICK Y

    IPC: G02B26/12 ,  G03G15/04 ,  G02B26/10 ,  G02B27/00

    Abstract: A raster output scanner (50) includes a collimator (14), a rotating polygon mirror (20), post-polygon optics (22) and a photoreceptor (24). The scanner utilizes a spot separation error correction system prior to its rotating polygon mirror. The spot separation error correction system of this invention is a zoom system which comprises two axially adjustable lenses (54,56). By moving the two lenses in a pre-determined relationship with each other, the magnification on the rotating polygon can be modified and as a result the spot separation (62) on the photoreceptor (24) can be substantially corrected.

    4.
    发明专利
    未知

    公开(公告)号：DE69311880D1

    公开(公告)日：1997-08-07

    申请号：DE69311880

    申请日：1993-11-18

    Applicant: XEROX CORP

    Inventor： MAEDA PATRICK Y

    IPC: G02B26/10 ,  G02B7/28 ,  G02B26/12 ,  G02B27/00

    Abstract: A raster scanning system utilising a focus error correction system (17) for correcting a focus error both in the fast-scan plane (Fig. 2) and in the cross-scan plane (Fig. 3) without affecting the scan characteristics of the post polygon optics (29). The focus error correction system comprises at least two axially adjustable lenses (40,42). One (40) of the lenses is spherical and the other (42) is cylindrical in the fast scan plane. The spherical lens (40) has to be adjusted first to correct the focus error (between focal point f and the plane of medium 32) in the cross-scan plane. Next, the cylindrical lens (42) should be adjusted to correct the focus error in the fast-scan plane. The lenses (40,42) may be diverging and converging (Fig. 2), or converging and diverging (Fig. 4), respectively.

    6.
    发明专利
    未知

    公开(公告)号：DE69311880T2

    公开(公告)日：1998-01-02

    申请号：DE69311880

    申请日：1993-11-18

    Applicant: XEROX CORP

    Inventor： MAEDA PATRICK Y

    IPC: G02B26/10 ,  G02B7/28 ,  G02B26/12 ,  G02B27/00

    Abstract: A raster scanning system utilising a focus error correction system (17) for correcting a focus error both in the fast-scan plane (Fig. 2) and in the cross-scan plane (Fig. 3) without affecting the scan characteristics of the post polygon optics (29). The focus error correction system comprises at least two axially adjustable lenses (40,42). One (40) of the lenses is spherical and the other (42) is cylindrical in the fast scan plane. The spherical lens (40) has to be adjusted first to correct the focus error (between focal point f and the plane of medium 32) in the cross-scan plane. Next, the cylindrical lens (42) should be adjusted to correct the focus error in the fast-scan plane. The lenses (40,42) may be diverging and converging (Fig. 2), or converging and diverging (Fig. 4), respectively.

    7.
    发明专利
    未知

    公开(公告)号：DE69213198D1

    公开(公告)日：1996-10-02

    申请号：DE69213198

    申请日：1992-12-21

    Applicant: XEROX CORP

    Inventor： MAEDA PATRICK Y

    IPC: G02B26/12 ,  G02B27/00

    Abstract: A wobble correction lens (10) for a raster output scanner combines a positive cross-scan piano-cylindrical lens (14), which provides most of the optical power for focusing the light beam to a scan line, with a diffractive surface (16), which corrects the cross-scan field curvature of the cross-scan piano-cylindrical lens. The diffractive surface (16) will have a multi-level structure (binary diffractive optical surface) which possesses a diffractive phase function that will flatten the cross-scan field curvature of the piano-cylindrical lens.

    9.
    发明专利
    未知

    公开(公告)号：DE69518875D1

    公开(公告)日：2000-10-26

    申请号：DE69518875

    申请日：1995-06-06

    Applicant: XEROX CORP

    Inventor： MAEDA PATRICK Y

    IPC: G02B26/12 ,  G03G15/04 ,  G02B26/10 ,  G02B27/00

    Abstract: A raster output scanner (50) includes a collimator (14), a rotating polygon mirror (20), post-polygon optics (22) and a photoreceptor (24). The scanner utilizes a spot separation error correction system prior to its rotating polygon mirror. The spot separation error correction system of this invention is a zoom system which comprises two axially adjustable lenses (54,56). By moving the two lenses in a pre-determined relationship with each other, the magnification on the rotating polygon can be modified and as a result the spot separation (62) on the photoreceptor (24) can be substantially corrected.

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