| 摘要 |
PURPOSE:To remove distortion completely by subjecting a second inclined supporter lead which connects a depressed pad part with a non-depressed first supporter lead part and this first supporter lead part which is continuously connected to said second supporter lead to coining at the same time. CONSTITUTION:Second inclined supporter lead parts 4, 4' which connect a depressed pad part 1 to non-depressed first supporter lead parts 3, 3' and the first supporter lead parts 3, 3' continuously connected with said second supporter leads are subjected to coining simultaneously. As a lead frame L is depressed, when continuous connecting parts 5, 5' are processed to be plastic by the coining, the plastic region expands from the second supporter lead parts 4, 4' to a part of the first supporter lead parts 3, 3'. Accordingly, a depression process of extremely high stability can be effected without accompanying a processing distortion and the improvement in quality of the lead frame can be contrived. |
