Browse Prior Art Database

AVAILABLE LIGHT MARGINAL ILLUMINATION SYSTEM

IP.com Disclosure Number: IPCOM000023414D
Original Publication Date: 1977-Oct-31
Included in the Prior Art Database: 2004-Mar-30
Document File: 2 page(s) / 388K

Publishing Venue

Xerox Disclosure Journal

Abstract

In reproducing apparatuses which include an optical system for viewing an object and for projecting an image thereof onto a photosensitive surface selectively at one of a plurality of copy image magnifications, there is a need for margin illum-ination of the photosensitive surface when making reduced sized images. The margin illumination system 1, herein, utilizes stray light derived from the lamp of the optics system for illuminating margin regions of the photosensitive surface 2.

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XEROX DISCLOSURE JOURNAL

AVAILABLE LIGHT MARGINAL
ILLUMINATION SYSTEM
Robert F. Allis
Vincent A. Capaccio

Proposed Classification
U.S. Cl. 355/7
mt. Cl. G03g 15/00

In reproducing apparatuses which include an optical system for
viewing an object and for projecting an image thereof onto a
photosensitive surface selectively at one of a plurality of
copy image magnifications, there is a need for margin illum-
ination of the photosensitive surface when making reduced
sized images. The margin illumination system 1, herein,
utilizes stray light derived from the lamp of the optics
system for illuminating margin regions of the photosensitive
surface 2.

The Figure shows an optical system similar to that employed in
the Xerox 3107 copier. The optical elements as shown are
arranged for reduction copying. A document supported on the
platen 3 is illuminated by a lamp 4 and the image rays are
received by a fixed full~rate mirror 5 and reflected to a
fixed half-rate mirror 6. An add mirror 7 which is selec-
tively positioned into the optical ray path solely for reduc-
tion copying receives the image ray from the fixed half-rate

4

.9

2

Volume 2 Number 5 September/October 1977 103

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AVAILABLE LIGHT MARGINAL ILLUMINATION SYSTEM (Cont'd)

mirror 6 and reflects it back to that mirror for reflection to
the half lens 8. The lens 8 projects the image onto the drum
via the drum mirror 9.

With the optical arrangement shown, a portion of the image...