| 摘要 |
PURPOSE:To manufacture a high-quality lead frame which can be easily handled and easily worked at a low cost through a simple process so that the delivery date and quality of the lead frame can be easily controlled by using ordinary strips and making the lead frame to be able to be worked and formed in one die. CONSTITUTION:A strip 21 which is used for the base of a lead frame and another strip 22 used for the heat sink section of the lead frame are simultaneously fed into one die. In the die, the two strips 21 and 22 are united into one body by punching the strips 21 and 22 to a prescribed shape while the strips 21 and 22 are fed forward in a state where they are put together. Then the union of the two punched strips 21 and 22 is further intensified by forming closed-in formed parts 28 and 30 by closing in prescribed parts of the strips 21 and 22. Thereafter, a lead frame provided with a heat sink section 20 is manufacture by forming and bending the punched strips 21 and 22. It is desirable to constitute the strip 21 of a high-strength material and the strip 22 of a good heat conductor. |
