Patent ID: 7469812

Claim:
A wire bonding apparatus for wiring a lead frame having a first semiconductor chip on a first main surface and a second semiconductor chip on a second main surface opposite said first main surface so that said second semiconductor chip is connected to said second main surface through a second wire, comprising: a mounting base for supporting said lead frame such that said first main surface connected to said first semiconductor chip through a first wire faces downward, said mounting base having a recess for receiving said first semiconductor chip and said first wire without contact therewith; a raised portion on a bottom of said recess for contacting with a surface of said first semiconductor chip that is connected to said first wire; a duct within said mounting base to connect said recess to an outside of said mounting base such that gas passes through said duct, said duct having at least two openings, said at least two openings located at a bottom of said recess at respective positions not covered by said first semiconductor chip; a heater for heating said mounting base and gas passing through said duct; and a gas supply for supplying gas heated by said heater to said recess through said duct.