High track density magnetic media with pitted optical servo tracks and method for stamping the tracks on the media
US5067039A · kind A · utility
52Cited by
5References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 20, 1989 |
| Grant date | Nov 19, 1991 |
| Priority date | — |
| Expiry date | Oct 20, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B23/30
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A flexible magnetic medium having a plurality of optical servo tracks indelibly marked on the medium and a method for stamping the tracks on the medium. The optical servo tracks comprise a plurality of circular concentric regions positioned on a face of a floppy disk with each circular region comprising a plurality of pits. The optical servo tracks are imprinted on the floppy disk by placing a stamper disk bearing a template of the optical servo tracks in a hydraulic press and pressing the stamper disk and floppy disk together, typically under five to nine tons per square inch of pressure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.