1988-08-08
1990-03-20
Hille, Rolf
357 72, 357 74, H01L 2328, H01L 2348
Patent
active
049105779
ABSTRACT:
In a lead frame having a number of square dimples arranged on the rear side of a bed portion in a lattice form of a pitch t, each side of the square dimples is disposed to form a predetermined angle relative to either of X--Y axes of the lattice extending in lateral and longitudinal directions of the bed portion. The square dimples may be provided at entire intersecting points between two sets of lines extending in parallel with the X and Y axes, or every other intersecting points of the same, so that an equal pitch of t or 2t is maintained between the dimples arranged in X and Y directions.
Ito Tetsuo
Nakatsuru Akinori
Sakurai Toshiharu
Sonoda Atsushi
Hille Rolf
Kabushiki Kaisha Toshiba
Le Hoang-anh
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