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NOTCHED OCCLUDER TO IMPROVE AXIAL ILLUMINATION UNIFORMITY

IP.com Disclosure Number: IPCOM000024921D
Original Publication Date: 1982-Oct-31
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 64K

Publishing Venue

Xerox Disclosure Journal

Abstract

An inherent problem associated with fluorescent lamp illuminators is their poor axial uniformity. For xerographic applications, various techniques have been used to compensate for this illumination end fall off including use of butterfly slits, end reflectors and lamp length extension. These techniques, however, are not applicable for an optical system employing a linear type lens such as gradient index lens (GRIN) arrays.

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XEROX DISCLOSURE JOURNAL

NOTCHED OCCLUDER TO IMPROVE AXIAL ILLUMINATION UNIFORMITY Carl S. Mesiti
Charles J. Urso

Proposed Classification
U.S. C1. 355/67 Int. C1. G03b 27/54

FIG. I

FIG. 2

Volume 7 Number 5 September/October 1982 343

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NOTCHED OCCLUDER TO IMPROVE AXIAL ILLUMINATION UNIFORMITY (Con t Id 1

An inherent problem associated with fluorescent lamp illuminators is their poor axial uniformity. For xerographic applications, various techniques have been used to compensate for this illumination end fall off including use of butterfly slits, end reflectors and lamp length extension. These techniques, however, are not applicable for an optical system employing a linear type lens such as gradient index lens (GRIN) arrays.

As shown in Figure 1, a document on a platen 10 is illuminated by means of apertured fluorescent lamp 12 and reflector 14. The light reflected from the document is transmitted through gradient index lens array 16 onto the surface of photoreceptor drum 18. A notched occluder member 20 (Figure 2) is positioned between the lamp and the reflector and is connected to a bracket member 22 which is fixed in place and supports lamp 12 and lens 16 in a fixed relationship. The notched portions of the member project into the direct illumination path to reflector 14. The notches, their width and spacing, can be optimized to improve the axial uniformity profile.

XEROX 344 DISCLOSURE JOURNAL

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