| 摘要 |
PROBLEM TO BE SOLVED: To prevent sneaking of a packaging resin to the lower face of a lead part when a lead frame is manufactured by pressing. SOLUTION: A metal plate 100 is punched out from its lower-surface side by a punch 81 to form a lead 2. Next, the lead 2 is crushed from its tip lower side by a punch 82 to form a tip removal stopping portion. After the tip end is cut at a specified length, the lead 2 is entirely crushed by a punch 83. Thus, sagging of the lower face in the lead 2 is eliminated. Then, a punch 85 is used to shape the lower surface of the lead 2 as well as to form removal stopping steps on both sides. Furthermore, a punch 84 is used to form a V-notch on the upper surface of the lead 2. COPYRIGHT: (C)2005,JPO&NCIPI |
