| 摘要 |
PURPOSE:To improve the quality of product by improving the whole productivity, by a method wherein a ground flaw part, which is in the direction meeting at right angles with a continuous direction of a flaw on the surface of a lead, is formed on the fringe parts of cavities of both molds joined to a surface part of the lead, the surface of the lead and a parting line between both the molds are pressure-contacted and a molten resin material is cast within the cavity. CONSTITUTION:Ground flaw parts 16, 17 of fixed directions are formed respectively on the fringe parts of both a top and bottom cavities 14, 15. In addition, the fixed direction means one meeting at right angles with a continuous direction of a flaw formed in a longitudinal direction of a lead 3 in a lead frame 18. Then the ground flaw parts 16, 17 are formed at least on the fringe parts of both the cavities joined to a surface part of the lead 3. A lead frame 18 fitted with electronic parts 13 is set up to a fixed position of a parting line P, L of a bottom force 11, mold clamping of both the forces 11, 12 is performed and a molten resin material is cast into both the cavities 14, 15 with pressurization. After the lapse of a necessary curing period of time, both the forces 11, 12 are broken again and a resin seal molded body is obtained. |
