Patent ID: 7080445

Claim:
A method for connecting a pair of printed circuit board comprising steps of: preparing a first printed circuit board by forming a first conductive pattern, which includes a first land, on a first insulating board substantially made of thermoplastic resin; preparing a second printed circuit board by forming a second conductive pattern, which includes a second land, on a second insulating board; forming a solder on one of the first and second lands; overlapping the first and second printed circuit boards such that the first and second lands confront each other; heat pressing an overlapped portion of the first and second printed circuit boards with a heat-pressing tool at a temperature higher than the glass transition temperature of the thermoplastic resin; and cooling the first insulating board at an area adjacent to an area pressed by the heat-pressing tool to permit the thickness of the first insulating board to change gradually in the cooled area, wherein the first and second lands are electrically connected with the solder and the thermoplastic resin is softened and plastically deformed to bond the first insulating board to the second insulating board at the step of heat pressing.