| 摘要 |
PURPOSE:To reduce a tensile force needed for a cutting operation and to prevent a sealed resin from being damaged during a breaking operation by a method wherein a non-connected part is formed in a connected narrow strip and every plural narrow strips in a lead frame are cut. CONSTITUTION:In a state that at least one non-connected part is formed in a connected narrow strip 11 and that the connected narrow strip in a lead frame has been divided, a tensile force in an extraction direction and toward the outside is exerted on a plurality of narrow strips 10 on one side of the non-connected part 16; the narrow strips are broken at a minimum cross-section part 15. In addition, a tensile force toward the outside is exerted on the plural narrow strips 10 on the side opposite to the one side of the non-connected part 16; the narrow strips are broken at the minimum cross-section part 15. Thereby, the narrow strips can be broken easily and satisfactory by means of the small tensile force without damaging a sealed resin. |
