Optical pick-up apparatus
US7440381B2 · kind B2 · utility
3Cited by
1References
45Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 2, 2005 |
| Grant date | Oct 21, 2008 |
| Priority date | — |
| Expiry date | Oct 13, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2007/13727
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical pickup apparatus for conducting recording and/or reproducing information of an optical information recording medium, comprises a light source; a converging optical system having an objective lens; and a photo-detector. The converging optical system comprises a plastic lens and a spherical aberration deviation correcting element to correct deviation of a spherical aberration of the converging optical system. A numerical aperature of the objective lens at an image-side is 0.65 or more.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.