Optical pickup apparatus and objective lens
US7102980B2 · kind B2 · utility
4Cited by
16References
253Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 25, 2001 |
| Grant date | Sep 5, 2006 |
| Priority date | — |
| Expiry date | Aug 19, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2007/0006
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An objective lens of an optical pickup apparatus converges a divergent light flux onto an information recording surface. The following conditional formula is satisfied:|δSA1/δU|·|δU|+|δSA2/δT|·|δT|≦0.07 λrms
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.