| 摘要 |
PROBLEM TO BE SOLVED: To suppress the occurrence of voids at molding time by controlling the intervals and widths of leads in the positioned direction of a molded runner gate area. SOLUTION: Many inner leads 11 are radially arranged at fixed intervals so as to form a square space section 14 for positioning a semiconductor chip. The outer ends of the inner leads 11 are supported by the insides of dam bars 19, and the inner ends of outer leads 12 are supported by the outsides of the dam bars 19. In addition, the other ends of the outer leads 12 are integrally connected to a frame. The dam bars 19 not only support the inner and outer leads 11 and 12, but also prevent a molten molding resin from leaking out to the spaces among the inner leads 12. In order to form a molded resin section, an initial sealing resin introducing area 18 into which the molten molding resin is injected through a mold runner is provided. In addition, an air-vent area 17 is provided to discharge the air in the cavity of a mold when the molten molding resin flows in the cavity. |
