Patent ID: 7229145
Filing Date: 2007-06-12
Classification: B23K,H05K

Abstract:
1. A method of improving the performance of a jetting assembly in an apparatus for jetting droplets of viscous medium on the fly onto a substrate, said jetting assembly being releasably mounted in said apparatus for jetting, said jetting assembly comprising a nozzle, an ejection mechanism connected to the nozzle, and a viscous medium container connected to the eject mechanism, the method comprising the steps of: obtaining information relating to an XY-position of the nozzle in relation to a calibration surface, the XY-position being the position of the nozzle in a plane parallel to the plane of the calibration surface, obtaining information relating to a Z position of the nozzle, the Z-position being the distance between the nozzle and the calibration surface, obtaining velocity information relating to the exit velocity a droplet of viscous medium has when said droplet exits said nozzle, and adjusting, on the basis of said information relating to an XY-position of the nozzle, said information relating to a Z position of the nozzle and said velocity information, a trigger position of the nozzle for the subsequent jetting of droplets, obtaining angular deviation information relating to the angular deviation of the actual jetting direction of said droplets from a nominal jetting direction, said nominal jetting direction being essentially perpendicular to the plane of the calibration surface, and using also said angular deviation information as basis for said adjustment of the trigger position for the subsequent jetting of droplets, wherein said step of obtaining information relating to an XY-position of the nozzle comprises wherein the step of obtaining said angular deviation information comprises: