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DUAL REFLECTOR ILLUMINATION SYSTEM

IP.com Disclosure Number: IPCOM000024760D
Original Publication Date: 1981-Dec-31
Included in the Prior Art Database: 2004-Apr-03
Document File: 2 page(s) / 126K

Publishing Venue

Xerox Disclosure Journal

Abstract

An illumination system is shown in Figure 1 which utilizes an illumination source and associated reflector to maximize light directed to a scanning lens in an object plane. The illumination system, indicated generally as 2 illuminates a document 4, moving in an object plane in the indicated direction. This system is commonly referred to as a continuous velocity transport (CVT) system and the absence of a platen permits the close positioning of illumination source and reflectors to the document as described below. An image of each incrementally scanned line is reflected at mirror 6, and projected by lens 10 onto CCD photosensor array 12 located in an imaging plane. The illumination system 2 comprises a linear lamp 14 which can be a fluorescent lamp with a reflective coating 16 on the lamp envelope. The coating is omitted from a poition of the envelope so that a clear longitudinal aperture 18 of approximately 45 is formed. A pair of facetted reflectors 20, 22 are located on either side of exposure zone 24 and serve to optimally direct illumination from lamp 16 onto narrow longitudinal exposure zone 24. Elements 14, 20, 22 are shown in end view and that their lengths extend perpendicular to the plane of the page thereby incrementally illuminating line of information on the document as it passes through the exposure zone.

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Page 1 of 2

DUAL REFLECTOR ILLUMINATION SYSTEM -~
James J. Amel
Philip L. Chen

Proposed Classification
U.S. C1. 355/8 Int. C1. G03g 15/28

FIG. /

6

&

12a 42

FIG. 2

Volume 6 Number 6 November/December 1981 37 3

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

Page 2 of 2

DUAL REFLECTOR ILLUMINATION SYSTEM (Cont'd)

An illumination system is shown in Figure 1 which utilizes an illumination source and associated reflector to maximize light directed to a scanning lens in an object plane. The illumination system, indicated generally as 2 illuminates a document 4, moving in an object plane in the indicated direction. This system is commonly referred to as a continuous velocity transport (CVT) system and the absence of a platen permits the close positioning of illumination source and reflectors to the document as described below. An image of each incrementally scanned line is reflected at mirror 6, and projected by lens 10 onto CCD photosensor array 12 located in an imaging plane. The illumination system 2 comprises a linear lamp 14 which can be a fluorescent lamp with a reflective coating 16 on the lamp envelope. The coating is omitted from a poition of the envelope so that a clear longitudinal aperture 18 of approximately 45 is formed. A pair of facetted reflectors 20, 22 are located on either side of exposure zone 24 and serve to optimally direct illumination from lamp 16 onto narrow longitudinal exposure zone 24. Elements 14, 20, 22 are shown in end view and that their lengths extend perpendicular to the plane of the page thereby incrementally illuminating line of information on the document as it passes through the exposure zone.

In operation, document 4 is moved through exposure zone 24. Each incremental line of the document is successively illuminated by a narrow pencil of light generated by illumination system 2. Reflectors 20 and 22 comprise a rigidly connected set of plane mirrors (facets). Each facet of these reflectors is set at an angle and is of such a length that the entire aperture 18 of lamp 14 is visible from exposure strip 24. The light reflected from the illuminated strip is directed along the optical path, the light bundles being contained within cone 26. Mirror 6 is positioned relative to exposure strip 24 so as to reflect a linear image of each scanned line into lens 10. This image is focused by le...