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METHODS FOR IMPROVED IRRADIANCE WITH GRADIENT INDEX LENS ARRAYS

IP.com Disclosure Number: IPCOM000025228D
Original Publication Date: 1984-Feb-29
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 79K

Publishing Venue

Xerox Disclosure Journal

Abstract

Two methods are proposed, using symmetric mirror combinations, which provide significant image plane irradiance improvement for line scanning applications employing lens arrays. The methods generally use mirrors to cause the generation of multiple apparent source or object lines in object space, within the field angle of the gradient index lens array, and a similar set of mirrors in image space to combine the multiple images to a single image line.

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XEROX DISCLOSURE JOURNAL

METHODS FOR Ih4PROVED IRRADIANCE Ned J. Seachman

                                   Proposed Classification C1. U.S. ARRAYS LENS INDEX GRADIENT WITH . Int. Cl. G02b 13/16 358/225

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Volume 9 Number 1 January/February 1984 67

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METHODS FOR IMPROVED IRRADIANCE WITH GRADIENT INDEX LENS AR- RAYS (Cont'd)

Two methods are proposed, using symmetric mirror combinations, which provide significant image plane irradiance improvement for line scanning applications employing lens arrays. The methods generally use mirrors to cause the generation of multiple apparent source or object lines in object space, within the field angle of the gradient index lens array, and a similar set of mirrors in image space to combine the multiple images to a single image line.

The "tunnel1' mirror arrangement is shown in drawing Figures 1 and 2. A pair of parallel mirrors 3, 4 placed in object space symmetrically about the optical axis 7 and parallel to the object line 8, generate two apparent object lines 10, 11. The original and two apparent object lines are within the field-of-view of the gradient index lens array 2. A similar set of mirrors 5, 6 placed in image space recombines the images into one image line 9. An estimate, based on the gradient index "rule of ellipse" and the effective pupil usage of the apparent object lines, suggests a 75% improvement in image irradiance. In fabrication, the location and parallelism of...