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US 5,326,990 AGranted
Composite lead frame with connected inner and outer leads
AssigneeHitachi Cable, Ltd.
InventorsMamoru Mita, Tomio Murakami, Shoji Takagi, Hiroki Tanaka, Kenji Yamaguchi
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Abstract
An outer lead of a metal lead frame is connected to an inner lead of a flexible lead-patterned substrate via a Au-Sn alloy layer. The Au-Sn alloy layer contains Au of 10 to 40 weight %. An inner lead of a metal lead frame is connected to a patterned lead of a flexible lead-patterned substrate by a heating tool. The inner lead is coated on bottom and side surfaces of its tip portion. The bottom surface faces the patterned lead.
Claims4
A composite lead frame, comprising:
- a metal lead frame comprising a frame member, and outer leads integral with said frame member;
- and
- a flexible lead-patterned substrate comprising an insulation film, and inner leads provided on said insulation film;
- wherein said outer leads of said metal lead frame and said inner leads of said flexible lead patterned substrate are correspondingly connected via Au-Sn alloy layers, each of said Au-Sn alloy layers containing 10 to 40 weight % of Au.
1 more element
Dependencies are inferred from the claim text.