Magneto-optical recording device having a controllable polarizing filter
US5796683A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 25, 1997 |
| Grant date | Aug 18, 1998 |
| Priority date | — |
| Expiry date | Mar 25, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B11/10543
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An information recording and reproduction apparatus for a magnetically induced superresolution magneto-optical recording medium includes an optical head that emits a laser beam to a signal recording plane of the medium and detecting a laser beam reflected therefrom. The optical head includes a polarization plane rotary unit and a polarizing filter between a light source and an objective lens. The polarization plane rotary unit transmits the laser beam while rotating the direction of polarization of the laser beam. The polarizing filter allows the laser beam to be transmitted at the outer portion independent of the direction of polarization, and allows only the laser beam that is polarized in a particular direction to be transmitted at the inner portion. The polarization plane rotary unit is controlled so as to rotate the direction of polarization of the laser beam in a direction different from the particular direction in reproduction. Thus, the optical superresolution method is carried out with the inner portion of the laser beam for radiation blocked only in reproduction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.