SCANHEAD CALIBRATION STRIP ON DH BELT
Original Publication Date: 1991-Feb-28
Included in the Prior Art Database: 2004-Apr-05
Xerox Disclosure Journal
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.