Patent ID: 6234382
Filing Date: 2001-05-22
Classification: B23K,H05K

Abstract:
A method for bonding solder balls to connecting points which are provided on a substrate in a predetermined pattern, wherein the solder balls are placed into holes provided in a plate-shaped element, which holes are each capable of accommodating one solder ball, and which are provided in said plate-shaped element in a pattern which corresponds with the pattern of the connecting points on the substrate, wherein a combination of at least one substrate and a plate-shaped element containing solder balls is passed, by means of a conveying element, through a housing in which the solder balls can be heated to melting temperature, wherein the conveying element is made to move along two paths, one extending above the other, with the aid of guide means, and wherein on a part of the conveying element that follows a first one of said two superposed paths, at least one substrate is placed on a plate-shaped element supported by said conveying element, after which the combination thus formed, which consists of a plate-shaped element and at least one substrate, is moved by the conveying element and turned upside down at a transition to a second one of said two superposed paths, after which it is moved along the second path through the housing, whilst solder balls are supplied to the combination of a plate-shaped element and at least one substrate near the beginning of said second path, in a position of said combination in which the plate-shaped element is at least substantially positioned above said at least one substrate.