High density magnetic head
US4618901A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 19, 1983 |
| Grant date | Oct 21, 1986 |
| Priority date | — |
| Expiry date | Jul 19, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/332
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A magnetic head for digital signal recording/reproducing (FIG. 11) having a C-ring shaped core (11.1) with a gap (G) for introducing leakage flux of a recording medium, a conductor (11.2, Y) for generating bias flux in hard magnetization axis of the core (11.1), apparatus (10.3, 11.3) for illuminating the core (11.1) with polarized optical beam, apparatus (11.4) for analyzing beam reflected by the core to convert polarization rotation to optical strength, and photo-detector (12.5) for providing electrical output signal relating to optical strength. The core is small enough to have a single magnetic domain, and is magnetized in the whole area because of the presence of the bias flux in spite of weak leakage signal flux, thus, the core has the capability to amplify signal flux, thus, the present head has high sensitivity and is capable of detecting flux in small area to be used for high density recording higher than 8000 bits/mm.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.