Patent · US Expired

Abrasion-resistant magnetic recording disk

US4689260A · kind A · utility

13Cited by

4References

6Claims

0Family size

Assignee

International Business Machines Corporation · US

Inventors

Marian Briska · Eppelheim, DE
Gerhard Elsner · Kaarst, DE
Holger Hinkel · Böblingen, DE

Key dates

Filing date	Oct 2, 1985
Grant date	Aug 25, 1987
Priority date	—
Expiry date	Oct 2, 2005

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/24521
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

A magnetic recording disk comprises a magnetic layer consisting of a binder and magnetic particles, a silicon substrate and abrasion-resistant material formed on the silicon substrate. The abrasion-resistant material is in the form of elevations which protrude from the silicon substrate and whose surface is coplanar with the surface of the magnetic layer. The abrasion-resistant elevations are formed on the substrate in a predetermined uniform distribution either after the surface of the substrate has been blanket doped and/or covered with a layer comprising aluminum as a main component, by tempering and optionally oxidizing; or after the surface of the substrate has been selectively doped, by etching off the undoped regions of the surface of the substrate.

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