Thin-film magnetic writing head with anti-saturation back-gap layer
US4503440A · kind A · utility
18Cited by
1References
6Claims
0Family size
Inventor
Key dates
| Filing date | Mar 8, 1983 |
| Grant date | Mar 5, 1985 |
| Priority date | — |
| Expiry date | Mar 8, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G19/00
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Apparatus for producing a magnetic image in a magnetic image storage medium. The apparatus includes a thin-film magnetic web with a pole-defining face and a second thin-film blanket magnetically spaced from the first magnetic web and having a second surface defining a second pole face. Spaced from the pole faces is a diamagnetic spacer which forms a special back gap in the magnetic circuit. An electrical coil sandwiched between the two magnetic materials induces flux in them. The spacer may extend normal to the flux path beyond the effective flux paths otherwise existing in the web and blanket.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.