Optical recording system with aspherical solid immersion lens
US6633439B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 16, 2000 |
| Grant date | Oct 14, 2003 |
| Priority date | — |
| Expiry date | Sep 13, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2007/13727
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The present invention provides an improved optical reading and recording system utilizing optical system employing an aspherical solid immersion lens (SIL). The improved optical system has an aspherical SIL between an objective lens and the recording media. The aspherical SIL reduces the focused electromagnetic radiation beam spot size by providing an increased numeric aperture (NA) of the optical system. The aspherical surface of the SIL provide greater manufacturing and operating tolerances between the objective lens and the aspherical SIL. Greater manufacturing tolerances provide an easier to manufacture optical system. Increased ease of manufacture reduces the cost of optical systems.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.