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UNIFORM AXIAL EXPOSURE ON A MULTIPLE REDUCTION COPIER

IP.com Disclosure Number: IPCOM000025512D
Original Publication Date: 1985-Oct-31
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 41K

Publishing Venue

Xerox Disclosure Journal

Abstract

Copiers with only one magnification usually have a slit at the image plane to compensate for non-uniformity of exposure due to the fall-off of image illumination. field angle. Many copiers now have three or more magnifications, so for optimum illumination at each magnification,, a different image plane slit would be needed. This would be difficult and expensive to incorporate. The present proposal is a for single, stationary object-space slit, tapered from registration to non-registration edge, which provides uniform exposure over the slit length for a broad range of magnifications.

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XEROX DISCLOSURE JOURNAL

UNIFORM AXIAL EXPOSURE ON A MULTIPLE REDUCTION COPIER
G. J. Maguire

This fall-off is approximately proportional to cos 4 ~4 where@ is the

Proposed Classification
U.S. CI. 355/67 Int. CI. G03b 27/54

Copiers with only one magnification usually have a slit at the image plane to compensate for non-uniformity of exposure due to the fall-off of image illumination.
field angle. Many copiers now have three or more magnifications, so for optimum illumination at each magnification,, a different image plane slit would be needed. This would be difficult and expensive to incorporate. The present proposal is a for single, stationary object-space slit, tapered from registration to non- registration edge, which provides uniform exposure over the slit length for a broad range of magnifications.

Volume 10 Number 5 September/October 1985 309

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310 XEROX DISCLOSURE JOURNAL

Volume 10 Number 5 September/October 1985

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