Selectively actuable magnetic head
US4346417A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 24, 1980 |
| Grant date | Aug 24, 1982 |
| Priority date | — |
| Expiry date | Mar 24, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/4907
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A gapped magnetic core is comprised of core material of one type. Gapping material, which is magnetically different from the core material, "completely" bridges the core gap. The gapping material has a lower magnetic saturation level than does the core material; and thus the gap cannot act as a transducer gap until it becomes magnetically saturated. When gapped cores as described above are stacked to form a multitrack head, the effects of inductive coupling between the cores is prevented; i.e., when, for example, one core of the stack of cores is actuated by magnetically saturating its gap, all other cores of the stack are inherently immune to inductive coupling to the actuated core. This is because induced flux in all non-actuated cores is magnetically short-circuited through their respective magnetic gaps.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.