Process for producing lead frames

Details Process for producing lead frames Process for producing lead frames

1998-02-04

2000-10-10

Gibson, Sharon

Radiation imagery chemistry: process, composition, or product th

Imaging affecting physical property of radiation sensitive...

Making electrical device

430314, 430316, 216 14, G03F 700

Patent

active

061300276

ABSTRACT:
A process for producing lead frames having lead tips with a minimum of side etching includes the steps of coating a metal lead frame substrate with a first photosensitive film, patterning the first photosensitive film, developing the patterned first photosensitive film, partially etching the metal surface of the lead-frame substrate beneath the developed patterned first photosensitive film, coating the partially etched metal surface with a positive second photosensitive, exposing the positive second photosensitive film to light passing through the developed first photosensitive film, developing the exposed second photosensitive film, performing fine etching through the developed second photosensitive film to a desired depth at least once, and removing the first and second photosensitive films.

REFERENCES:
patent: 3960561 (1976-06-01), Haining
patent: 4983252 (1991-01-01), Masui
patent: 5834159 (1998-11-01), Stolmeijer
patent: 5945259 (1999-08-01), Kim

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