Patent ID: 7059044

Claim:
A method of manufacturing a printed wiring board, comprising: laminating board materials to form a laminated body, the board materials including a first B-stage board material comprised of a thermosetting resin and reinforcing woven glass fabric, and comprised of an interlayer connection formed of a via hole filled with conductive paste arranged through said thermosetting resin and woven glass fabric, the board materials further including at least one of: one of a metal foil, a metal foil bonded on a support, and a circuit pattern bonded on a support; a second B-stage board material including a thermosetting resin and reinforcing woven glass fabric, and including an interlayer connection comprised of a via hole filled with conductive paste; a third B-stage board material including a thermosetting resin and reinforcing woven glass fabric, including an interlayer connection comprised of a via hole filled with conductive paste, and including one of a circuit pattern and metal foil; and a C-stage board material having one of a circuit pattern and a metal foil; hot-pressing the laminated body by heating and pressing using a predetermined temperature profile based on one of a rate of temperature rise and a combination of heating temperature and curing time, such that a flow rate of the thermosetting resin due to said hot-pressing is no less than 1% and no greater than 20%, the flow rate being defined as a ratio of a mass of a leaked portion of thermosetting resin to a mass of the first B-stage board material, the second B-stage board material, and the third B-stage board material; and removing a peripheral portion of the hot-pressed laminated body, the peripheral portion including the leaked portion of the thermosetting resin leaked during said hot-pressing.