Fishing – trapping – and vermin destroying
Patent
1991-05-29
1993-04-13
Chaudhuri, Olik
Fishing, trapping, and vermin destroying
437249, H01L 2158, H01L 2160, H01L 21603, H01L 21607
Patent
active
052022897
ABSTRACT:
A method of manufacturing a semiconductor device comprising a lead frame (2A-2I) and a semiconductor crystal (3) provided on one of the conductors (2C) and comprising at least one semiconductor switching element, and electrically conducting connections (4A-4I from the crystal (3) to the conductors (2). The conductors (2) are stamped from a metal strip, after which the tag tips (2a) are coined between a coining die (8) and an anvil (6) to remove irregularities. After that, the conducting connections (4A-4I) are secured to the tag tips (2a) by ultrasonic welding. According to the invention, the anvil surface (5A) and the die surface (7) parallel thereto enclose a downward angle (.alpha.) with the adjoining portion (5B) of the anvil surface, which angle is preferably at least 0.50 and at most 5.degree..
The invention also relates to a device for carrying out the method, comprising an anvil (6) and a coining die (8), the anvil surface (5) comprising two adjoining flat portions (5A, 5B) which form an obtuse angle (.beta.) of preferably at least 175.degree. and at most 179.5.degree. enclosing the anvil material (6), the die surface (7) of the coining die (8) being practically parallel to one of the these portions (5A).
Chaudhuri Olik
Graybill David E.
Miller Paul R.
U.S. Philips Corporation
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