Patent ID: 6028682
Filing Date: 2000-02-22
Classification: G01N,H04N

Abstract:
Scanning device for pixel-by-pixel photoelectric measurement of a measured object, particularly a printed sheet preferably printed in multiple colors, with a measuring table on which a measured object, can be fixed for measurement, with a scanning device which can be moved over the surface of said measured object and which photoelectrically scans at least one pixel of said measured object, respectively, with a drive unit that moves said scanning device over the measured object such that all pixels of said measured object can be measured with a control unit for said scanning device and said drive unit, and with a processing unit for processing and analyzing the measuring signals generated by said scanning device from said scanned pixels of said measured object, characterized in that said scanning device comprises a plurality of measuring heads for pixel-by-pixel measurement of a corresponding plurality of said pixels of said measured object lying substantially in a row one behind the other in a first direction (y) and that said measuring heads are arranged such that they can be collectively moved in a second direction (x) which extends substantially transversely to first direction (y) such that said measured object can be scanned in a plurality of first scanning tracks (S.sub.a) which are parallel to said second direction (x), said scanning device cyclically sequentially activates said measuring heads, said measuring heads scan said measured object as they collectively move along scanning tracks (S.sub.a, S.sub.b) and are arranged substantially along a straight line (L.sub.1) which is inclined to said first direction (y) by a correction angle (.alpha..sub.1) such that the pixels of said measured object, scanned during a scanning cycle lie along a scanning line (L.sub.a) which is parallel to said first direction (y).