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    Multispot polygon ros with maximized line separation depth of focus
    1.
    发明公开
    Multispot polygon ros with maximized line separation depth of focus 失效
    多点Polygonrasterausgabeabtaster具有优化的间距深度

    公开(公告)号：EP0713323A3

    公开(公告)日：1998-05-13

    申请号：EP95308316

    申请日：1995-11-21

    Applicant: XEROX CORP

    Inventor： APPEL JAMES J ,  DUNN SUSAN E

    IPC: B41J2/44 ,  G02B26/10 ,  G02B26/12 ,  G03G15/04 ,  H04N1/113 ,  H04N1/191 ,  H04N1/04

    CPC classification number: G02B26/123 ,  H04N1/1135 ,  H04N1/1912

    Abstract: An apparatus for improving the depth of focus in a raster output scanner (ROS), and more particularly to a system for maximizing the line separation depth of focus of a multispot ROS while maintaining the system common depth of focus. The apparatus comprises: a source of at least two light beams (A,B; Fig. 1); a scanning polygon mirror having at least one facet (92); pre-scanning optics including a collimator (84), an aperture (86) and a cross-scan cylinder lens (88); and post-scanning optics including a dual element (94a,94b) f-theta scan lens (94) and a wobble correcting element. In a preferred design for a ROS-based system, the system common depth of focus (system common DOF) is maximized, where the system common DOF is characterized as the depth-of-focus over which all performance parameters are met. The optical system design achieves a desirable system common DOF while maintaining a line separation of 127 µm (1/200 inch).

    2.
    发明专利
    未知

    公开(公告)号：DE69531924T2

    公开(公告)日：2004-08-12

    申请号：DE69531924

    申请日：1995-11-21

    Applicant: XEROX CORP

    Inventor： APPEL JAMES J ,  DUNN SUSAN E

    IPC: B41J2/44 ,  G02B26/10 ,  G02B26/12 ,  G03G15/04 ,  H04N1/113 ,  H04N1/191 ,  H04N1/04

    Abstract: An apparatus for improving the depth of focus in a raster output scanner (ROS), and more particularly to a system for maximizing the line separation depth of focus of a multispot ROS while maintaining the system common depth of focus. The apparatus comprises: a source of at least two light beams (A,B; Fig. 1); a scanning polygon mirror having at least one facet (92); pre-scanning optics including a collimator (84), an aperture (86) and a cross-scan cylinder lens (88); and post-scanning optics including a dual element (94a,94b) f-theta scan lens (94) and a wobble correcting element. In a preferred design for a ROS-based system, the system common depth of focus (system common DOF) is maximized, where the system common DOF is characterized as the depth-of-focus over which all performance parameters are met. The optical system design achieves a desirable system common DOF while maintaining a line separation of 127 mu m (1/200 inch).

    3.
    发明专利
    未知

    公开(公告)号：DE69901264T2

    公开(公告)日：2002-10-17

    申请号：DE69901264

    申请日：1999-01-04

    Applicant: XEROX CORP

    Inventor： NOWAK WILLIAM J ,  BOCK EDWARD C ,  APPEL JAMES J

    IPC: H04N1/113 ,  B41J2/44 ,  B41J2/525 ,  G02B26/12 ,  G03G15/01

    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.

    5.
    发明专利
    未知

    公开(公告)号：DE69323951T2

    公开(公告)日：1999-08-05

    申请号：DE69323951

    申请日：1993-11-03

    Applicant: XEROX CORP

    Inventor： APPEL JAMES J ,  NACMAN ARON

    IPC: B41J2/44 ,  G02B26/10 ,  H04N3/08 ,  H04N3/26 ,  G06K15/12

    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.

    METHOD FOR SPOT POSITION CONTROL IN AN OPTICAL OUTPUT DEVICE EMPLOYING A VARIABLE WAVELENGTH LIGHT SOURCE
    6.
    发明专利
    METHOD FOR SPOT POSITION CONTROL IN AN OPTICAL OUTPUT DEVICE EMPLOYING A VARIABLE WAVELENGTH LIGHT SOURCE 未知

    公开(公告)号：CA2068060C

    公开(公告)日：1998-04-28

    申请号：CA2068060

    申请日：1992-05-06

    Applicant: XEROX CORP

    Inventor： APPEL JAMES J ,  PAOLI THOMAS L

    IPC: G02B26/10 ,  G02B26/12 ,  G06K15/12 ,  H01S3/10 ,  H01S5/06 ,  H04N1/047 ,  H04N1/113 ,  H04N1/12 ,  B41J2/47 ,  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 method for controlling the position of the spot in the slow scan direction of the image plane including the steps of generating a beam of light, deflecting the beam of light by way of an optical beam deflecting element such t hat the optical beam deflecting element deflects the path of the beam of light by an amount that is determined by the wavelength of the light beam, and varying the wavelength of the beam of light such that the amount that the beam of light is deflected by the optical beam deflecting element is varied to achieve control of the position of the spot at which the beam of light is incident on the image plane i n the slow scan direction. The invention may be embodied in an apparatus which include s a light source capable of emitting the beam of light at a selected one of at lea st two selectable wavelengths and prism for refracting the beam of light an amount whic h depends on the wavelength of the beam of light, the amount of refraction determining the position of the spot in the slow scan direction on the image pla ne. 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.

    9.
    发明专利
    未知

    公开(公告)号：DE3778760D1

    公开(公告)日：1992-06-11

    申请号：DE3778760

    申请日：1987-06-11

    Applicant: XEROX CORP

    Inventor： APPEL JAMES J ,  COSTANZA DANIEL W ,  DASTIN RICHARD M

    IPC: G03B27/62 ,  G03G15/00 ,  G03G15/04 ,  G03G15/043 ,  G03G15/047 ,  G03G15/36 ,  G03G21/00 ,  G03G21/02 ,  G03G21/04 ,  G03G15/32

    Abstract: A light lens scanning system (8) operable in a document scan mode to reproduce documents (30) onto a photosensitive record medium (12) is modified to operate in a document edit mode. A document is placed face-up on a platen surface by the operator and the edit mode is selected. A laser generated light spot output from a raster output scanner (102) is introduced into the optical system and is directed along an optical path which is opposite to the optical path of a projected document image. The light spot output is visible to the operator at the platen (40) as a light cursor. This movement of the cursor is under control of the operator via switches on the control panel (88). The cursor is moved through x and y coordinates (XoYo; XoY1; X1Y1; X1Y0) to delineate an area of the document to be selectively erased. Coordinate positions are entered into a microcontroller memory. Following exposure of the entire image at the record medium, control means (89) generate signals in response to the entered coordinate positions and these signals are used to actuate an erase mechanism for a time sufficient to erase the portion of the copy corresponding to the selected portion of the document.

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