Active solid-state devices (e.g. – transistors – solid-state diode – Combined with electrical contact or lead – Bump leads
Patent
1997-07-22
1999-09-07
Kelley, Nathan K.
Active solid-state devices (e.g., transistors, solid-state diode
Combined with electrical contact or lead
Bump leads
257780, H01L 2348
Patent
active
059491418
ABSTRACT:
A process for producing laminated film/metal structures comprising bumped circuit traces on a non-conductive substrate wherein a copper sheet/polyimide film laminate is coated with resist on the exterior surfaces. The resist adjacent the polyimide film is selectively exposed and etched to expose an area of the polyimide film. The exposed polyimide film is etched to form vias through the polyimide film to the inner side of the copper sheet. The resist adjacent the polyimide film is stripped away and a metal bump is electrolytically plated through each via onto the copper sheet. A subsequent layer of resist is electrophoretically applied over the bumps. The resist material adjacent the copper sheet is then selectively exposed and etched to expose areas of the copper sheet. The exposed copper sheet is etched to form circuit traces and the remaining resist adjacent both the polyimide film and the copper sheet is stripped away.
REFERENCES:
patent: 5231051 (1993-07-01), Baldi et al.
patent: 5250469 (1993-10-01), Tanaka et al.
patent: 5367253 (1994-11-01), Wood et al.
patent: 5529504 (1996-06-01), Greenstein et al.
patent: 5550407 (1996-08-01), Ogashiwa
patent: 5575662 (1996-11-01), Yamamoto et al.
"Bump Tape Connector," IBM Tech. Disc. Bulletin, vol. 36, No. 09B, Sep. 1993.
Farnworth Warren M.
Hembree David R.
Kelley Nathan K.
Micro)n Technology, Inc.
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