Magnetic recording disk
US4514452A · kind A · utility
8Cited by
9References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 11, 1984 |
| Grant date | Apr 30, 1985 |
| Priority date | — |
| Expiry date | Apr 11, 2004 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31938
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A magnetic recording disk is disclosed, which comprises (1) a three-layered laminate consisting of a core layer of a biaxially oriented polyolefin film which has a birefringence of not more than 0.01 and an amorphous-region orientation coefficient of not more than 0.2 and two outer layers of a biaxially oriented polyester film adhereed to the core layer, and (2) a magnetic layer formed on at least one side of the laminate. This magnetic recording disk undergoes only a slight dimensional change with a variation in humidity and temperature, and the dimensional change is isotropic in the plane.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.