Patent · US Expired

Magnetic recording medium having a high recording density and its production

US6235368A · kind A · utility

2Cited by

11References

12Claims

0Family size

Assignee

Emtec Magnetics GmbH · DE

Inventors

Hans-Bertram Wiegemann · Schriesheim, DE
Peter Stehle · Willstätt, DE
Hansjorg Traub · Aalen, DE
Helmut Jakusch · Bischofswerda, DE

Key dates

Filing date	Sep 21, 1998
Grant date	May 22, 2001
Priority date	—
Expiry date	Sep 21, 2018

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/256
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

A magnetic recording medium which consists of at least two layers cast one on top of the other is described, the lower layer containing acicular magnetic pigments having a field strength of 5-40 kA/m and a magnetization of 20-70 nTm.sup.3 /g and the upper layer containing a high-density metal powder dispersion. After application of the layers, the magnetic recording medium is subjected to a magnetic disorientation treatment while the layers are in the wet state, so that said recording medium has virtually no magnetic and mechanical anisotropy. The magnetic recording medium produced in this manner is particularly suitable for floppy disks having a high storage capacity of substantially more than 100 megabytes.

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