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Browse Prior Art Database

AUTOMATIC AXIAL EXPOSURE CONTROL

IP.com Disclosure Number: IPCOM000025588D
Original Publication Date: 1986-Jun-30
Included in the Prior Art Database: 2004-Apr-04
Document File: 4 page(s) / 93K

Publishing Venue

Xerox Disclosure Journal

Abstract

Document illumination systems for copiers typically employ mercury fluorescent lamps. These lamps inherently cause exposure nonuniformities due to end-to-end variations, Figures 1-3 illustrate a mechanism for compensating for the effects of these nonuniformities

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Page 1 of 4

XEROX DISCLOSURE JOURNAL

AUTOMATIC AXIAL EXPOSURE Proposed Classification

CONTROL Craig F Wood-Thomas us ci 35518

Int. C1 G03g 15/28

f t

Volume 11 Number 3 May/June 1986 1,3 1.

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

Page 2 of 4

AUTOMATIC AXIAL EXPOSURE CONTROL (Cont'd)

132 XEROX DISCLOSURE JOURNAL

Volume 1% Number 3 May/June 1986

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

Page 3 of 4

AUTOMATIC AXIAL EXPOSURE CONTROL (Cont'd)

Document illumination systems for copiers typically employ mercury fluorescent lamps. These lamps inherently cause exposure nonuniformities due to end- to- end variations, Figures 1-3 illustrate a mechanism for compensating for the effects of these nonuniformities

Figure 1 shows an illumination system 10 for illuminating a document 12 placed upon a transparent platen 16 and for projecting a Image through lens 18 onto drum photoreceptor 20 via drum mirror 22. A lens shade 24 is placed on the image side of the lens As shown in Figure 2, shade 24 comprises two segments mounted about pivot 26. Centerline background voltage 1s set by thumbscrew 28 connected to pivot 26 Pivot 26 can be raised or lowered to admit less or more of the light projected by the lens With respect to the centerline reference, any end-to-end exposure differences are corrected by applying servo-derived motion to one or both of the shade halves. The shade motions are relative respective to their respective drum mirror light sensing outputs As show...