Burns, Doane, Swecker & Mathis, LLP
Leadframe tip arrangement designing method
 First, a reference point on a die pad and a leadframe tip arrangement line are set. A plurality of isosceles triangles having the same base length are set so that their apices are located at the reference point. A given number of isosceles triangles are arranged inside the leadframe tip arrangement line by adjusting the base length. The base length of the isosceles triangles is employed as a uniform lead pitch, and a uniform lead width is then determined. The base length of the isosceles triangles is calculated by using the successive bisection algorithm. 
Mitsubishi Denki Kabushiki Kaisha
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Satoshi Takao Yasuhito Hirokazu Takashi Yoshiharu Akihiro
Ookyuu Takahashi Suzuki Taki Arita Takahashi Goto