HDD suspension and its manufacture
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United States of America Patent
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Issued Date -
Apr 6, 2006
app pub date -
Oct 20, 2005
filing date -
Feb 16, 2001
priority date (Note) -
Abandoned
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Abstract
This invention relates to an HDD suspension and a process for its manufacture with high productivity and reliability. The HDD suspension of this invention is manufactured from a laminate composed of a stainless steel substrate, an insulating resin layer and a metal foil by wet-etching the laminate by the use of a basic fluid. The insulating layer of the laminate is composed of plural layers of polyimide, every constituent layer exhibits a mean etching rate of 0.5 .mu.M/min or more by a 50 wt % aqueous solution of KOH at 80.degree. C., the layers in contact with the stainless steel substrate and the metal foil are those of polyimide (B) exhibiting a glass transition temperature of 300.degree. C. or less and the adhesive strength between the layer of polyimide (B) and either the stainless steel substrate or the metal foil is 0.5 kN/m or more.
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