Optical scanning device
US6567365B1 · kind B1 · utility
12Cited by
6References
21Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 28, 2000 |
| Grant date | May 20, 2003 |
| Priority date | — |
| Expiry date | Jun 25, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2007/0013
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical scanning device for scanning an optical record carrier. A high numerical aperture objective lens system includes at least a first lens element (12) arranged to converge the beam to a certain extent and a second lens element (13) arranged to converge the beam to a greater extent. The device comprises a spherical aberration compensation optical subsystem including an electro-optical element for altering an optical path length in a spherical aberration generating region, which region is located in the optical path between the first lens element and the location of the record carrier in the device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.