Browse Prior Art Database

BLINK COMPARATOR COPY QUALITY FAILURE DETECTOR

IP.com Disclosure Number: IPCOM000027023D
Original Publication Date: 1994-Dec-31
Included in the Prior Art Database: 2004-Apr-07
Document File: 2 page(s) / 69K

Publishing Venue

Xerox Disclosure Journal

Abstract

The present invention proposes the idea that an optical blink comparator can be utilized in a xerographic process for the purpose of detecting a failure in copy quality. The blink comparator allows for the checking of differences between the original image to be copied and the image of each and every copy

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XEROX DISCLOSURE JOURNAL

BLINK COMPARATOR COPY Proposed Classification QUALITY FAILURE DETECTOR U.S. C1.355/299
R. Godlove Int. C1. G03g 21/00

The present invention proposes the idea that an optical blink comparator can be utilized in a xerographic process for the purpose of detecting a failure in copy quality. The blink comparator allows for the checking of differences between the original image to be copied and the image of each and every copy

A blink comparator consists of two imaging systems oriented on two different sources for image data, two shutter mechanisms (mechanical or electro- optical) alternatingly transmitting the two images, and an optical system for directing the two shuttered images to the same location. The blink comparator system applied as proposed herein, would direct the alternatingly transmitted images onto a detecting system, which can be as simple as a single simple photo-detector, or an electro-optical scanning system. The electro-optical scanning system would allow for analysis as to the location and nature of the failure.

of output.

For a configuration employing a simple single photo-detector, any differences in the images of the original and the copy results in a varying light level, varying at the rate at which the shutters alternately past the two images. An electronic detector tuned to that rate can be exquisitely sensitive to such differences, and the detection of such variations can be used to correct or warn of differences bet...