Magneto-optical recording apparatus capable of both magnetic modulation and light modulation recording
US5434831A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 31, 1994 |
| Grant date | Jul 18, 1995 |
| Priority date | — |
| Expiry date | Aug 31, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B11/1058
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Disclosed is a magneto-optical recording apparatus for recording an information signal on or for erasing an information signal from magneto-optical recording media by irradiating the magneto-optical recording media with a beam of light while applying a magnetic field thereto. The magneto-optical recording apparatus includes, as a magnetic field application device, a composite magnetic head which includes a first magnetic head capable of modulating a generated magnetic field in accordance with an information signal, and a second magnetic head capable of generating a constant magnetic field which is not associated with the information signal and capable of switching the direction of the constant magnetic field. This provides a magneto-optical recording apparatus which can use magneto-optical recording media for both light modulation type recording and magnetic field modulation type recording, and which ensures overwriting without increasing the overall size of the apparatus.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.