Browse Prior Art Database

SCANHEAD CALIBRATION STRIP ON DH BELT

IP.com Disclosure Number: IPCOM000026296D
Original Publication Date: 1991-Feb-28
Included in the Prior Art Database: 2004-Apr-05
Document File: 2 page(s) / 77K

Publishing Venue

Xerox Disclosure Journal

Abstract

One of the problems with scanners in general, (and moving document scanners in particular), is the need to recalibrate the scanner on a daily basis. This may be done in a stationary document, full platen, scanning optics-type scanning system by using a fixed, solid black test strip mounted under an edge of the platen. However, such a test strip cannot be used in a moving document (constant velocity transport or stationary scanner) type scanning system used as an Electronic Front End (EFE) unit for an independent or printer-connected scanner. A moving document (stationary scanner) EFE is desirable for reasons of cost, compactness, scanning simplicity, etc. The document maybe transported by a moving endless belt or wheels. Requiring the key operator to run a test sheet document through the system at least once a day is not considered commercially desirable.

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XEROX DISCLOSURE JOURNAL

SCANHEAD CALIBRATION STRIP Proposed Classification ON DH BELT U.S. C1.358/163
Paul F. Morgan Int. C1. H04n 5/14

One of the problems with scanners in general, (and moving document scanners in particular), is the need to recalibrate the scanner on a daily basis. This may be done in a stationary document, full platen, scanning optics-type scanning system by using a fixed, solid black test strip mounted under an edge of the platen. However, such a test strip cannot be used in a moving document (constant velocity transport or stationary scanner) type scanning system used as an Electronic Front End (EFE) unit for an independent or printer-connected scanner. A moving document (stationary scanner) EFE is desirable for reasons of cost, compactness, scanning simplicity, etc. The document maybe transported by a moving endless belt or wheels. Requiring the key operator to run a test sheet document through the system at least once a day is not considered commercially desirable.

This concept is to print such a black scanhead calibration test strip (and also a grey-scale test strip, if desired) directly onto a wide document transport belt (Document Handler (DH) belt) surface (e.g.? a conventional light colored constant velocity transport belt). This calibration portion of the belt may then be automatically cycled past the stationary scanhead in a calibration cycle mode initiated at preset periodic intervals, programmed in the controller from its clock,...