Magnetic recording medium
US4316927A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 2, 1979 |
| Grant date | Feb 23, 1982 |
| Priority date | — |
| Expiry date | Feb 2, 1999 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/266
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In a magnetic recording medium comprising a flexible non-magnetic base and a magnetic layer carried by the base, composed of magnetic powder dispersed in a resinous binder, wherein the flexible non-magnetic base has a Young's modulus not less than 350 Kg/mm.sup.2 in the longitudinal direction and a Young's modulus not less than 500 Kg/mm.sup.2 in the direction transverse to the longitudinal direction, and a thickness from 6 to 14 microns, a ratio of the Young's modulus of the base in the longitudinal direction to the Young's modulus of the base in the direction transverse to the longitudinal direction is from 0.5 to 0.9, the magnetic layer has a Young's modulus from 700 to 1400 Kg/mm.sup.2 in the longitudinal direction and a Young's modulus from 400 to 1100 Kg/mm.sup.2 in the direction transverse to the longitudinal direction, and a thickness from 2 to 5 microns, a ratio of the Young's modulus of the magnetic layer in the longitudinal direction to the Young's modulus of the magnetic layer in the direction transverse to the longitudinal direction is from 1.3 to 1.9.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.