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DOCUMENT EXPOSURE DEVICE INCLUDINC A MASKED FRESNEL REFLECTOR

IP.com Disclosure Number: IPCOM000023853D
Original Publication Date: 1979-Feb-28
Included in the Prior Art Database: 2004-Apr-01
Document File: 2 page(s) / 294K

Publishing Venue

Xerox Disclosure Journal

Abstract

According to the disclosure, as shown in Fig. 1, a scanning illumination system for a photocopier is indicated generally at 2 and includes a platen 3 disposed in an object plane, a photoreceptor drum 4 disposed in an image plane, a projection lens 5 located between the object and image planes, and first and second mirrors 6 and 7

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Page 1 of 2

XEROX DISCLOSURE JOURNAL

DOCUMENT EXPOSURE DEVICE INCLUD-~ INC A MASKED FRESNEL REFLECTOR Thomas 3, Behe

Proposed Classification U~S~Cl~355/8
Int, Cl. G03g 15/28

F/G2

Volume 4 Number 1 3anuary/February 1979 93

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

Page 2 of 2

DOCUMENT EXPOSURE DEVICE INCLUDING A MASKED ~NEL REFLECTOR ~Cont~d

According to the disclosure, as shown in Fig. 1, a scanning illumination system for a photocopier is indicated generally at 2 and includes a platen 3 disposed in an object plane, a photoreceptor drum 4 disposed in an image plane, a projection lens 5 located between the object and image planes, and first and second mirrors 6 and 7 to fold the optical system. A linear scanning lamp 8, located immediately beneath the platen, is a tubular lamp whose length extends across the appropriate portion of the platen (into the plane of the page). In an exemplary embodiment, lamp 8 is a fluorescent lamp which includes a reflective coating 9 on the lamp envelope. The coating is omitted from a portion of the envelope so that a clear longitudinal aperture 12 is formed permitting the illumination to be transmitted towards the reflector and the platen. A facetted reflector 13 comprising a rigidly connected set of plane mirrors (facets) 13a is positioned so as to face the light aperture 12 of lamp 8. Reflector 13 can be mounted to move coextensive with lamp 8 in the direction shown by the arrows (by means not shown) or platen 3 can be moved whil...