Stretched surface recording disk substrate
US4631609A · kind A · utility
13Cited by
10References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 16, 1984 |
| Grant date | Dec 23, 1986 |
| Priority date | — |
| Expiry date | Feb 16, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/825
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A stretched surface recording disk includes an annular substrate to which are adhesively attached magnetic recording films covering each major surface of the substrate. The substrate has annular ridges adjacent its inner and outer diameters which support the film above and parallel to each major surface and film attachment surfaces adjacent the ridges which are radiused an amount sufficient to place the adhesive in compression, preferably about 0.030 inches (0.80 mm).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.