| 摘要 |
PURPOSE:To facilitate the exhaust of air and reactive gas in a molding step by providing a through hole at the position corresponding to an air vent of a mold of an outer frame of a lead frame used for a transfer molding. CONSTITUTION:Through holes 30a, 30b are formed at the positions interposed between air vents 26 of one outer frame 1b of a lead frame 10. Thus, when a holding resin mold 7 is formed in a metal mold, molding resin is flowed in a direction of an arrow 8 into a cavity to fill the cavity, and air and reactive gas are removed in a direction of an arrow 9 from the air vents 26. Even if the resin flows to stoppers 11a, 11b to block the vents 26, the contacting area of the resin with the outer frame, i.e., the stoppers 11a, 11b is small, and the air and gas exhaust port can be obtained readily by overcoming the viscosity of the resin. |
