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Bezel End-Mirrors for a Scanning Illumination System

IP.com Disclosure Number: IPCOM000063977D
Original Publication Date: 1985-May-01
Included in the Prior Art Database: 2005-Feb-18

Publishing Venue

IBM

Related People

Authors:
Grant, DE Nelson, WH [+details]

Abstract

A copier illumination system that uses a lens for focusing the document at the object plane onto the image plane at the photoconductor requires more light at the edges of the copy area. This is necessary because the lens has an irradiance profile at the image plane that decreases with increasing angle of light from the lens. Copier illumination systems, additionally, experience a fall-off of light as the angle to the document increases. At the very edges, the reduced profile can be unacceptable. A way of increasing the light at the document edges is to use the light that otherwise would be lost by passing below the glass and to the side. This has been done previously by placing end-reflectors appropriately to redirect the light. In a scanning illumination system, these mirrors usually move with the light source.