Browse Prior Art Database

AUTOMATIC DENSITY CONTROL USING CODE READER

IP.com Disclosure Number: IPCOM000025882D
Original Publication Date: 1988-Oct-31
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 54K

Publishing Venue

Xerox Disclosure Journal

Abstract

A bar code scanner or reader for automatic density control. A test patch composed of a succession of different voltage levels on a photoreceptor (corresponding to lines of a bar code), are arranged in order that the number of lines developed to a visible state are used to produce proper development control. As an example, assuming five lines, the first three would be developed to visibility when toner concentration (developability) is normal, and only two lines developed to visibility if a standard addition of toner is needed. The presence of only one line might call for a larger than normal toner addition and a count of zero or more than three lines trigger appropriate signals to the operator. The lines of various voltages could be generated in several ways such as a small transparency with a flashing light, a transparency intermittently introduced into the path of the exposure light, an opaque test patch adjacent the document area for exposure through a lens, or a small charging device intermittently energized to various voltages.

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(EROX DISCLOSURE JOURNAL

AUTOMATIC DENSITY CONTROL Proposed Classification USING CODE READER U.S. C1.355/3TR James R. Davidson Int. C1. G03g 15/00

A bar code scanner or reader for automatic density control. A test patch composed of a succession of different voltage levels on a photoreceptor (corresponding to lines of a bar code), are arranged in order that the number of lines developed to a visible state are used to produce proper development control. As an example, assuming five lines, the first three would be developed to visibility when toner concentration (developability) is normal, and only two lines developed to visibility if a standard addition of toner is needed. The presence of only one line might call for a larger than normal toner addition and a count of zero or more than three lines trigger appropriate signals to the operator. The lines of various voltages could be generated in several ways such as a small transparency with a flashing light, a transparency intermittently introduced into the path of the exposure light, an opaque test patch adjacent the document area for exposure through a lens, or a small charging device intermittently energized to various voltages.

Volume 13 Number 5 Septernber/October 1988 261

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262 XEROX D[SCLOSURE JOURNAL

Volume 13 Number 5 September/October 1988

[This page contains 1 picture or other non-text object]