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Illumination Regulation for Array Scanner

IP.com Disclosure Number: IPCOM000054168D
Original Publication Date: 1980-Jan-01
Included in the Prior Art Database: 2005-Feb-13

Publishing Venue

IBM

Related People

Authors:
Bassetti, LW Habegger, MA Hooker, RB Shirley, RE Van Hook, DA Jorgenson, GW Kirton, AJ [+details]

Abstract

Figs. 1 and 2 show alternative feedback loop techniques for controlling the background light level sensed by a photosensor array in a document scanner. In Fig. 1, the feedback loop controls the illumination lamp. In Fig. 2, the feedback loop controls the sampling time or exposure time for the photosensor array.