Combined magnetic write and read head for a recording medium which can be magnetized perpendicularly
US4675766A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 20, 1984 |
| Grant date | Jun 23, 1987 |
| Priority date | — |
| Expiry date | Jul 20, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/1278
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A combined magnetic write and read head for a recording medium to be magnetized perpendicularly comprises a magnetic conductor body for carrying the magnetic flux, the conductor body having two pole legs which are arranged one behind the other in the direction of relative motion of the head and medium and having a predetermined distance from each other. At least one coil winding is associated with the conductor body. In order to reduce problems regarding the mechanical design of such a head and to make possible at the same time a switchable write and read function having high efficiency, a separate coil winding is associated with each pole leg. The flux conduction directions in the pole legs are adjustable for the write function by means of the separate coil windings such that the flux directions extend, at the ends of the pole legs facing the recording medium, parallel at least to a high degree. Secondly, the magnetic fluxes in the pole legs may be adjusted in such a manner that, at the ends of the pole legs facing the recording medium, the magnetic flux in one of the pole legs is smaller and of a direction opposed to that of the magnetic flux in the other pole leg.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.