method and device for aligning substrate and the lotpastendruck druckschablone

摘要

The invention relates to a method and a device for aligning a substrate and a printing screen for printing said substrate with solder paste. Said method comprises the following steps: the first substrate is placed opposite the printing screen, at a distance therefrom; a first optical detection device is inserted between the printing side of the first substrate and the printing screen; position-defining first structures of the first structure and of the printing screen are detected by means of the first optical detection device; the first substrate and the printing screen are aligned on the basis of information obtained during the detection of the structures; reference data is detected from position-defining second structures on the side of the aligned substrate, opposing the printing side, by means of a second optical detection device; the first optical detection device is removed; the first substrate is removed and a second substrate is added opposite the printing screen; actual data is detected from position-defining second structures on the side of the second substrate, opposing the printing side, by means of the second optical detection device; and the second substrate and the printing screen are aligned on the basis of a comparison of reference data and actual data.