Patent ID: 6011629
Filing Date: 2000-01-04
Classification: G03F,H05K

Abstract:
A method of positional alignment of substrate and screen mask in electrical paste screen printing, comprising the steps of:moving a substrate relatively and horizontally with respect to a camera to observe two peculiar portions of said substrate with said camera so as to register the position data of said peculiar portions into a substrate recognition result data storage section;moving a screen mask relatively and horizontally with respect to a camera to observe two peculiar portions of said screen mask with said camera so as to register the position data of said peculiar portions into a screen mask recognition result data storage section;obtaining relative positional discrepancies between said substrate and said screen mask in the directions of X and Y through the calculation in a control section based on said two position data so as to register the results of said calculation into a position correcting calculation result storage section; andobtaining a line segment connecting the two peculiar portions of said substrate and a line segment connecting the two peculiar portions of said screen mask and obtaining a relative angle between the obtained two line segments through the calculation in the control section so as to register the result of said calculation into the position correcting calculation result storage section.