Burns, Doane, Swecker & Mathis, LLP
Designing method of leadframe tip arrangement
 To determine leadframe tip positions, a circular arc portion where leadframe tips are to be arranged is determined so as to be opposed to each of the four corners of a die pad by performing a search. Then, straight line portions are set so as to extend from the circular arc portion and to be opposed to the die pad sidelines. The shape of each leadframe tip on the circular arc portion is defined as a region that is sectioned by two concentric circles and two radial rays extending from the center of the concentric circles. The division between the circular arc portion and straight line portions and the setting of the center of the circular arc portion are performed automatically. The leadframe tip width and interval are determined independently of each other. 
Mitsubishi Denki Kabushiki Kaisha
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Yasuhito Yoshiharu Takashi Hirokazu Hirochika Takao Akihiro Satoshi
Suzuki Takahashi Arita Taki Kawaguchi Takahashi Goto Ookyuu