Magneto-optical recording system utilizing a leakage magnetic field of focusing actuator
US4672594A · kind A · utility
19Cited by
0References
5Claims
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Assignee
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Key dates
| Filing date | Feb 13, 1985 |
| Grant date | Jun 9, 1987 |
| Priority date | — |
| Expiry date | Feb 13, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B11/10536
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In a magneto-optical file memory wherein a storage medium having a vertical magnetic film is irradiated with a laser beam to reverse a magnetization direction of the magnetic film, thereby to write and/or erase information, and a rotation of polarizable face of reflected light from the storage medium is detected, thereby to reproduce information; a magneto-optical file memory wherein a sense of a leakage magnetic field of an actuator which controls an optical system for condensing the laser beam on the storage medium is set to be the same as a sense of initial magnetization of the magnetic film of the storage medium.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.