Verfahren und Vorrichtung zur präzisen Lötzinnzuführung.

摘要

This invention employs a carrier (10) upon which a thin conductive film (12) has been applied. The conductive film is of a metallic material which exhibits a surface energy such that it is not readily wetted by solder. A patterned mask (14) is disposed on the conductive film, with the mask having openings which expose selected areas (16, 18) of the conductive film. Solder is deposited in the mask openings and is weakly adherent to the exposed areas of the conductive film. The carrier is then disposed over and in registration with conductive land areas (20, 22) of a circuit carrier (24), such that the solder in the mask openings is aligned with the land areas of the circuit carrier. Subsequently, the carrier and circuit land areas are brought into contact, heated, the solder bonded to the lands, and the carrier is lifted away for subsequent reuse. In another species of the invention, a thin film layer of solder is directly deposited on and weakly adherent to a flexible base layer. Subsequently, tool means which registers with the areas to be soldered, presses the base layer/solder combination against the areas to be coated with solder, thereby causing the solder to adhere to the underlying circuit configuration.