Magnetic storage medium
US4354210A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 16, 1979 |
| Grant date | Oct 12, 1982 |
| Priority date | — |
| Expiry date | Feb 16, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/596
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Binary bits on a magnetic storage medium are read by a magnetic head that moves at approximately constant speed relative to the medium. The medium includes several elongated adjacent magnetic tracks, each including a succession of longitudinally positioned polarized magnetic flux variations arranged in elemental areas of equal length along the length of each track. Adjacent areas are susceptible to having like and unlike magnetic flux polarizations. The head and tracks are positioned so the head straddles a pair of the tracks and is simultaneously responsive to flux variations in the straddled tracks. The head and track move relative to each other so the head is responsive to successive flux variations as time progresses. The areas are arranged so there is always a magnetic flux polarization transition at predetermined equi-spaced positions along the track length at a boundary between a pair of elemental areas. The transition direction at each boundary indicates a binary bit value. The fluxes of the elemental areas between adjacent boundaries selectively have different polarity variations to assure that like polarity transitions at each boundary represent like binary bit values.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.