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ADAPTIVE ILLUMINATION BALANCING SYSTEM

IP.com Disclosure Number: IPCOM000024208D
Original Publication Date: 1979-Dec-31
Included in the Prior Art Database: 2004-Apr-02
Document File: 2 page(s) / 57K

Publishing Venue

Xerox Disclosure Journal

Abstract

In copier/duplicator illumination systems, the illumination of the document must be carefully controlled as to light profile. In many configurations multiple lamps are used, and these have to carefully matched in order to assure the desired light profile.

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KEROX DISCLOSURE JOURNAL

ADAPTIVE ILLUMINATION BALANCING Proposed Classification SYSTEM U.S. Cl. 355/8

HaibertM. Harris Int. C1. G03g 15/28

In copier/duplicator illumination systems, the illumination of the document must be carefully controlled as to light profile. In many configurations multiple lamps are used, and these have to carefully matched in order to assure the desired light profile.

It is also necessary in some applications to control total exposure, and this is typically accomplished by the use of a photodetector which measures the intensity of the illumination or the total exposure and through a control system, adjusts the total output of the lamps.

A sensing system, such as that described for exposure control, can be used to provide adaptive balancing or matching of the lamps in the illumination system. For example, in a flash system there may be four lamps, one located at each corner of the document glass. The photodector would be located to have a simultaneous view of all lamps. During calibration or balancing, each lamp would flash separately. The control system would adaptively adjust the charge voltage or flash length to obtain a desired exposure from each lamp. The charge voltages or the ratio of flash lengths necessary to obtain the required profile are stored in memory for use by the control system in making subsequent exposures.

Volume 4 Number 6 November/December 1979 787

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