Magneto-optical head involving solid immersion lens with two-layer heat-dispersive coil
US6529449B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 26, 2000 |
| Grant date | Mar 4, 2003 |
| Priority date | — |
| Expiry date | Dec 21, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B11/1058
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A magneto-optical head with a centrally-located solid immersion lens and a coil formed radially about the lens advantageously utilizes an insulating material with a relatively high thermal conductivity for isolating the coil and avoiding heat damage to the head when current is passed through the head during a write operation. First and second coils in first and second coil layers are coupled by a via to form a continuous coil. A combination of a chemical-mechanical contouring operation and the lack of any intervening low thermal conductivity material adjacent the coil effectively produces an insulation layer that is thin but has a contour with a very smooth surface, resulting in a highly compact multiple-level coil.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.