Patent · US Expired

Process for fabricating a multi-layer magnetic thin film disk

US4356066P · kind P · plant

9Cited by

4References

5Claims

0Family size

Assignee

International Business Machines Corporation · US

Inventors

Helmut Kienle · Eppelheim, DE
Gerhard Schmid · Mindelheim, DE
Werner Steiner · Schrobenhausen, DE
Gerhard Trippel · Sindelfingen, DE

Key dates

Filing date	Mar 30, 1981
Grant date	Oct 26, 1982
Priority date	—
Expiry date	Mar 30, 2001

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S428/90
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

Multi-layer magnetic thin film disks comprising a synthetic resin layer on an aluminum-containing substrate and an overlying metallic magnetic layer, are liable to have pin holes in the synthetic resin layer caused by galvanic corrosion of the aluminum in the substrate. The pin holes are passivated by aluminum oxide produced therein by anodically oxidizing the aluminum of the substrate in an electrolytic bath, the electric voltage of which is well below the normal passivation voltage for aluminum.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.