Magnetic recording apparatus and method
US4318136A · kind A · utility
20Cited by
6References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 13, 1980 |
| Grant date | Mar 2, 1982 |
| Priority date | — |
| Expiry date | Feb 13, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/02
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
By recording an alternating signal in an ancillary recording medium having high coercivity, such medium will exhibit an external field of a given strength. The ancillary medium is placed in proximation to the record zone of a signal-carrying magnetic head cooperative with a primary magnetic recording medium of lesser coercivity, the fields of the head and ancillary medium algebraically adding to effect signal recording in the primary medium. When the field of the ancillary medium has a strength approximating the coercivity of the primary medium, the signal current applied to the magnetic head may be quite small.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.