Thin-film magnetic head
US4942489A · kind A · utility
1Cited by
8References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 5, 1988 |
| Grant date | Jul 17, 1990 |
| Priority date | — |
| Expiry date | Jan 5, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/3143
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A thin-film magnetic head which can simultaneously trace two tracks is disclosed. This head comprises: a pair of magnetic gap portions; and a pair of magnetic thin-film layers each of which includes a magnetic pole portion in contact with the magnetic gap portion. A distance between these layers increases as they go away from the magnetic pole portions. Each of the layers includes an expanded portion having a cross sectional area in the passing direction of the magnetic fluxes which is larger than a cross sectional area in the passing direction of the magnetic fluxes at the magnetic pole portion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.