公开(公告)号：BR9304921A

公开(公告)日：1994-06-21

申请号：BR9304921

申请日：1993-12-02

Applicant: XEROX CORP

Inventor： BOCK EDWARD C ,  APPEL JAMES J

IPC: G02B26/10 ,  G02B26/12 ,  G03G15/28

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.

公开(公告)号：CA2068060A1

公开(公告)日：1993-02-20

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

公开(公告)号：AU8042991A

公开(公告)日：1992-02-06

申请号：AU8042991

申请日：1991-07-16

Applicant: XEROX CORP

Inventor： LOCE ROBERT P ,  APPEL JAMES J

IPC: G03G15/01 ,  G03G15/02 ,  G03G15/04 ,  G06K15/12 ,  H04N1/50

公开(公告)号：DE69531924D1

公开(公告)日：2003-11-20

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).

公开(公告)号：DE69616879T2

公开(公告)日：2002-04-11

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.

公开(公告)号：DE69519064D1

公开(公告)日：2000-11-16

申请号：DE69519064

申请日：1995-07-20

Applicant: XEROX CORP

Inventor： APPEL JAMES J ,  LAMA WILLIAM L

IPC: B41J2/44 ,  G02B26/12 ,  G06K15/12 ,  H04N1/40 ,  B41J2/47 ,  G02B26/10

公开(公告)号：DE69323951D1

公开(公告)日：1999-04-22

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.

公开(公告)号：DE69222604T2

公开(公告)日：1998-04-02

申请号：DE69222604

申请日：1992-07-09

Applicant: XEROX CORP

Inventor： APPEL JAMES J ,  OSSMAN KENNETH R OSSMAN KENNET

IPC: G02B26/12 ,  G06K15/12 ,  B41J2/44 ,  H04N1/047 ,  H04N1/113 ,  H04N1/12 ,  H04N1/04 ,  G02B26/10

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.

公开(公告)号：DE69223004D1

公开(公告)日：1997-12-11

申请号：DE69223004

申请日：1992-08-18

Applicant: XEROX CORP

Inventor： APPEL JAMES J ,  PAOLI THOMAS L

IPC: G06K15/12 ,  H04N1/047 ,  H04N1/113 ,  H04N1/12 ,  H04N1/04 ,  G02B26/10

公开(公告)号：DE69310301T2

公开(公告)日：1997-11-06

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.