Magnetic recording medium
US5139849A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 12, 1991 |
| Grant date | Aug 18, 1992 |
| Priority date | — |
| Expiry date | Nov 12, 2011 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31721
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A magnetic recording medium comprises a substrate composed of a polyimide film bearing, on a face thereof, a polyimide coated layer containing inorganic particles dispersed therein, and a magnetic recording layer formed on said polyimide coated layer. A magnetic recording medium comprises a substrate composed of a polyimide film containing inorganic particles dispersed therein and bearing, on a face thereof, a polyimide coated layer containing inorganic particles dispersed therein, and a magnetic recording layer formed on the other face of said polyimide film, wherein the average particle size of the inorganic particles dispersed in said polyimide film is smaller than that of the inorganic particles dispersed in said polyimide coated layer. A magnetic recording medium comprises a magnetic recording layer formed by a thin film deposition process on a substrate, wherein said substrate is provided, on the surface thereof, with small projections with a density of 10.sup.5 to 10.sup.8 projections/mm.sup.2, and the statistical distribution of the heights of said projections satisfies following relations H.sub.0.01 <600 .ANG., H.sub.0.1 >120 .ANG., H.sub.1 >100 .ANG. and H.sub.0.1 -H.sub.…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.