Patent ID: 7810703

Claim:
A wire bonding method by which a second semiconductor chip is connected with at least one second wire to a second main surface of a lead frame, with a first main surface thereof having been connected to a first semiconductor chip with at least one first wire, comprising: providing said lead frame on a mounting base such that said first semiconductor chip and wire are received by a recess of said mounting base without said first wire coming into contact with said recess; and supplying said recess with a gas through a duct to heat said second semiconductor chip wherein, in the step of providing the lead frame on the mounting base, said mounting base further includes: a heat block having a heater therein; and a heat plate provided on the heat block and having a support surface for supporting the lead frame; wherein, in the step of providing the lead frame on the mounting base, said duct has a duct portion extending along the heater; wherein, in the step of supplying the recess with the gas, said duct has at least two openings located at a bottom of the recess at respective positions not covered by the first semiconductor chip.