Stock material or miscellaneous articles – Structurally defined web or sheet – Including aperture
Patent
1986-01-27
1987-10-20
Powell, William A.
Stock material or miscellaneous articles
Structurally defined web or sheet
Including aperture
29827, 156630, 156634, 156644, 156656, 1566591, 1566611, 156902, 357 70, 361421, 428156, 428571, 428573, 430318, B32B 310, B44C 122, C23F 102
Patent
active
047013630
ABSTRACT:
A process for step etching a metal tape adapted for use in tape automated bonding comprises forming an etch resist pattern on the tape having a first portion defining a pattern of leads and a second portion within the first portion defining steps in the leads. The metal tape is etched in the regions not covered by the resist at a desired rate and etched in the regions for forming the step at a reduced rate as compared to the desired rate, thereby forming the tape having a plurality of leads corresponding to the resist pattern with each of the leads having a step therein generated by the second portion of the resist pattern. The metal tape formed by the process has a unique structure wherein the web between bumps formed at the end of the leads and the remainder of the leads has a unique channel beam cross section for stiffening the web which is relatively thin as compared to the leads or the bump.
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Olin Corporation
Powell William A.
Weinstein Paul
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