Browse Prior Art Database

Low-Eccentricity, Elliptical-Cylindrical Illumination System

IP.com Disclosure Number: IPCOM000044359D
Original Publication Date: 1984-Dec-01
Included in the Prior Art Database: 2005-Feb-05

Publishing Venue

IBM

Related People

Authors:
Grant, DE Maddox, RA Routt, W [+details]

Abstract

The figure shows an illumination system wherein a low eccentricity elliptical-cylindrical reflector 1 with a shallow curvature is used to generate a narrow footprint of light 2 at a document glass 3. The light rays 4, reflecting from an object or a document, are deflected via a mirror 5 positioned at an inclined angle (such as 45Œ) relative to the object and into an objective lens (not shown). The light from the objective lens may then be incident on an image plane containing light-sensitive arrays (not shown). The elliptical-cylindrical reflector uses a section of the ellipse arc 6 around the intersection of the minor axis with the ellipse arc where the source magnification is unity.