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ELECTRONIC SCANNER FOR COPIER EXPOSURE STATION

IP.com Disclosure Number: IPCOM000024081D
Original Publication Date: 1979-Aug-31
Included in the Prior Art Database: 2004-Apr-02
Document File: 2 page(s) / 197K

Publishing Venue

Xerox Disclosure Journal

Abstract

The figures show a copier exposure system which provides the equivalent of slit scanning optics without the mechanical components usually required. As shown, two banks of exposure lamps 20, 20 are aligned in the scan direction on each side of a document platen 40. Reflectors 50, 50 partially surround the lamps to reflect the light and direct it to the platen surface, Lens 60 projects the scanner image on a suitable imaging plane. When a copy cycle is initiated, the first three lamp pairs (1, 2, 3 in the figure) are turned on providing illumination across a corresponding band or scan length of the platen. As the exposure cycle continues, lamp pair //1 shuts off and lamp pair //4 turns on. This progression of lamp switching, continued through lamp pair //14, follows the scan at the required scan speed until the entire area between the lamps is scanned. The scanning is thus accomplished electronically so that the speed can easily be varied in the case of a change of magnification.

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XEROX DISCLOSURE JOURNAL

ELECTRONIC SCANNER FOR COPIER EXPOSURE STATION
dames Critchlow

Proposed Classification
U.S. CL 355/8

mt. CL G03g 15/28

20

a3

4

5

6

7

8

9

l0

2

3

20'

40

20

60

Volume 4 Number 4 3uly/August 1979 519

P1G./a

F/G.Jb

The figures show a copier exposure system which provides the equivalent of slit scanning optics without the mechanical components usually required. As shown, two banks of exposure lamps 20, 20 are aligned in the scan direction on each side of a document platen 40. Reflectors 50, 50 partially surround the lamps to reflect the light and direct it to the platen surface, Lens 60 projects the scanner image on a suitable imaging plane. When a copy cycle is initiated, the first three lamp pairs (1, 2, 3 in the figure) are turned on providing illumination across a corresponding band or scan length of the platen. As the exposure cycle continues, lamp pair //1

shuts off and lamp pair //4 turns on. This progression of lamp switching, continued through lamp pair //14, follows the scan at the required scan speed until the entire area between the lamps is scanned. The scanning is thus accomplished electronically so that the speed can easily be varied in the case of a change of magnification.

[This page contains 1 picture or other non-text object]

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                  XEROX DISCLOSURE JOURNAL 520 Volume 4 Number 4 July/August 1979

[This page contains 1 picture or other non-text object]