公开(公告)号：DE3062856D1

公开(公告)日：1983-06-01

申请号：DE3062856

申请日：1980-02-26

Applicant: XEROX CORP

Inventor： AVERY STEPHEN T ,  JAMES D REES ,  DURBIN JOHN A ,  SIMPSON GEORGE R ,  GREEN FREDERICK A

IPC: G03B15/05 ,  G03B27/54 ,  G03G15/04 ,  G09F13/00 ,  G09F13/04

Abstract: A full-frame flash illumination system for a document copying machine including an optical cavity (10) having interior walls coated with a white, diffusely reflecting material. One end (20) of the cavity contains a platen (24) for positioning a document to be copied while the opposing end (30) contains a lens (34) for forming an image of the document on a light sensitive image plane (36). Illumination from a single flash illumination source (42) located within the cavity, undergoes multiple reflecions from the walls resulting in a uniform diffuse illumination of the document.

公开(公告)号：JPH10229473A

公开(公告)日：1998-08-25

申请号：JP451598

申请日：1998-01-13

Applicant: XEROX CORP

Inventor： JAMES D REES ,  SEACHMAN NED J ,  TANDON JAGDISH C

IPC: H04N1/00 ,  H04N1/04 ,  H04N1/10 ,  H04N1/193

Abstract: PROBLEM TO BE SOLVED: To select a scanning time reduction priority mode or a depth-of-focus priority mode of a bound book original by selectively placing plural gradient index lens arrays of different depths of focus at the optical conjugate relation positions set between a copy image support member and an optical sensor array. SOLUTION: An optical device 23 includes 1st and 2nd gradient index lens arrays 100 and 101, an optical sensor array 24, etc. and performs reciprocating scanning under a transparent platen 20 where an image support member such as a document or a book, etc., is placed. The arrays 100 and 101 have the depths of focus 1.2mm and 2.6mm respectively, and one of both arrays 100 and 101 is moved to an optical path set between the image support member and the array 24 by a positioning mechanism of an RIS selector 48. When the image support member is a document, the high radiation efficiency is selected based on a small depth of focus. Meanwhile, a large depth of focus is selected for a bound book serving as the image support member, so that the copying surface of the book does not go out of focus.

公开(公告)号：JP2000158708A

公开(公告)日：2000-06-13

申请号：JP32749399

申请日：1999-11-17

Applicant: XEROX CORP

Inventor： HAMMOND THOMAS J ,  JAMES D REES

IPC: B41J2/44 ,  B41J2/45 ,  B41J2/455 ,  G03G15/00

Abstract: PROBLEM TO BE SOLVED: To provide an electrophotographic printing press using an exposure station which uses a light-emitting diode of reduced water front requirements. SOLUTION: The printing press includes a photosensitive body 10, a charging device 302 arranged in the vicinity of the photosensitive body 10, an exposing device 300 placed in the vicinity of the photosensitive body and charging device and having a plurality of light-emitting diodes on one object face, a gradient index lens array 308 arranged between the plurality of light-emitting diodes and the photosensitive body and having a plurality of gradient index rods for condensing lights from the plurality of light-emitting diodes onto the photosensitive body, a cooling assembly 306 separately arranged from the photosensitive body with a larger breadth than the plurality of light-emitting diodes for cooling the light-emitting diodes, and a developing station 304 set in the vicinity of the photosensitive body and exposing device for adhering a toner onto electrostatic latent images. The charging device 302 is spaced to the developing station by a distance smaller than the breadth of the cooling assembly 306.