| 摘要 |
PURPOSE:To prevent burrs from appearing on a lead frame by a method wherein the outer shape inside a plane of a frame is prescribed substantially by the frame which is sandwiched between an upper metal mold and a lower metal mold. CONSTITUTION:A resin sealing region A is prescribed roughly by the following: narrow-width longitudinal section bars 4a composed of definite length parts in the axis-line direction; and transverse section bars 5,... which are extended collectively by a prescribed length to the transverse direction from the longitudinal section bars 4a. A frame 1 is formed of a conductive material which is soft as compared with a material of which a metal mold is formed. Consequently, in a state that an upper metal mold and a lower metal mold 8, 9 have been fastened, a gap is not formed between the surface of the metal mold surrounding their cavities 10, 11 and the longitudinal section bars 4a,... or the transverse section bars 5,... which are sandwiched and pressed by it. As a result, a thin burr is not produced at a resin package P formed in the resin sealing region A. |
