Magneto-optical storage system
US5161133A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 25, 1991 |
| Grant date | Nov 3, 1992 |
| Priority date | — |
| Expiry date | Jun 25, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B11/10515
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A magneto-optical (M-O) storage detection channel which includes optical means for detecting edge transitions between magneto-optical domains. The beam returning from the storage medium is analyzed both spatially and in polarization. When a transition is centered under the read laser beam, the spatial reversal in the sign of the amplitude of the signal polarization due to the spatially nonuniform Kerr rotation is compensated by a reversal due to spatially nonuniform (split) detectors or a matched optical filter. The optical powers on the two sides of each split detectors or on two independent detectors sensitive to orthogonal polarizations become unequal thereby producing an electrical signal signal which comprises spaced peaks in opposite directions at the leading and trailing edges of the M-O domain or mark.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.