Process for preparing magnetic disk
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United States of America Patent
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May 11, 1993
Issued Date -
N/A
app pub date -
Jul 25, 1991
filing date -
Sep 30, 1987
priority date (Note) -
Expired
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Abstract
This invention relates to a process for preparing a magnetic disk, which comprises (a) subjecting a substrate having an anodized aluminum film to mirror surface-finishing, (b) widening pores of the anodized aluminum film by chemical dissolution treatment so that the total area of pores becomes from 20 to 80% of the entire surface area, thereby retaining crystalline alumina of the anodized aluminum film extruded after the chemical dissolution treatment, and (c) coating the resultant substrate with a magnetic continuous thin film.
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