Importance

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Abstract

A scanning device comprising a scanning member provided for pathwise scanning a medium along a scanning path by means of a scanning beam, said scanning member and said medium being mutually movable with respect to each other, characterized in that said scanning member comprises a plurality of N scanning modules, each i.sup.th (1.ltoreq.i.ltoreq.N) scanning module being each time provided for scanning its assigned i.sup.th segment of said scanning path and an end point of a j.sup.th (1.ltoreq.j.ltoreq.N-1) segment corresponds with a starting point of a (j+1).sup.th segment, and wherein each i.sup.th scanning module comprises deviation determining means provided for determining on at least one position situated along said i.sup.th segment a cross-scan deviation between a predetermined scanning path and the path scanned by the scanning beam, said deviation determining means being connected with scanning beam steering means provided for determining upon receipt of said cross-scan deviation a first correction signal in such a manner -as to minimize said cross-scan deviation and for steering said scanning beam under control of said correction signal, and wherein said scanning beam steering means of a k.sup.th (1.ltoreq.k.ltoreq.N) scanning module being provided for starting the scanning of its assigned k.sup.th segment on an assigned time t.sub.k within a scanning period .DELTA.T for scanning the scanning path, the scanning beam steering means of each m.sup.th scanning module (k.noteq.m and 1.ltoreq.m.ltoreq.N) being provided for starting the scanning of their assigned m.sup.th segment on time ##EQU1## if m>k and ##EQU2## if m

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First Claim