Magnetic record member and process for manufacturing the same
US4326229A · kind A · utility
23Cited by
9References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 12, 1979 |
| Grant date | Apr 20, 1982 |
| Priority date | — |
| Expiry date | Dec 12, 1999 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/269
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An improved magnetic disk recording device having a smooth recording medium layer covered with a protective film layer whose surface is formed with radially extending sinusoidal jogs or undulations defining a surface roughness greater than that of the underlying recording medium. These jogs act to avoid wear due to the adhesiveness between the device and a recording or reproducing head. The jogged protective film layer is formed by using a solvent of specified boiling point in a spin-coating process.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.