Multilayer lead frame with alternate fitting lead

Abstract

PURPOSE: To produce a fine pitch lead frame economically through punching by superposing a second layer part having a frame and a plurality of second layer leads on a first layer part having a frame and a plurality of first layer leads thereby fitting the first layer leads and the second layer leads alternately. CONSTITUTION: The multilayer lead frame comprises a first layer part 20 having a frame 14 and a plurality of first layer leads 16 extending therefrom, and a second layer part 22 having a frame 14 and a plurality of second layer leads 16 extending therefrom wherein the second layer leads 16 extend in parallel with the first layer leads 16 and they are fitted alternately. For example, each layer part 20, 22 has six leads 16 on each side of the frame 14 and when they are combined to overlay each other, twelve leads are present on each side in plan view. The lead 16 at the lower layer part 20 is flat whereas the lead 16 at the upper layer part 22 is bent slightly downward at a position 26 close to the frame 14 and the lead 16 exists in the same plane substantially over the entire length thereof. COPYRIGHT: (C)1991,JPO

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