| 摘要 |
PURPOSE:To obtain the structure of the lead frame which effectively stops the outflow of resin flowing out from a section between external lead metallic pieces and can remove the metallic section of the lead frame functioning as the stop of the flow without giving a mechanical shock just after the frame is molded with resin when the frame is sealed with resin. CONSTITUTION:A metallic plate 7 worked through punching working as shown in the figure (a) is previously formed in the shape only of an internal lead body up to a section in the vicinity of a resin molding line, and the metallic plate is formed by means of a punching die without being separated from an outer frame 10 left around external lead bodies 8 or a connecting section 11 connecting the frame to sections to which other molding sections are shaped so that metallic sections 9 to be punched among external leads serve as the stop of the flow of resin when the frame is sealed with resin when the external lead bodies 8 are formed as shown in the figure (b). The noses of the metallic sections 9 of the stop of the flow of the resin-that is, end surfaces 13 contacting with the resin molding line 12 shown in a dotted line-are worked so as to be positioned along the molding line or be arranged at positions slightly displaced in the outward direction from the resin mold section. |
