Objective lens, optical pickup device, and optical recording/reproducing apparatus
US7995290B2 · kind B2 · utility
0Cited by
4References
20Claims
0Family size
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Key dates
| Filing date | May 15, 2009 |
| Grant date | Aug 9, 2011 |
| Priority date | — |
| Expiry date | Jan 29, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/1374
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An objective lens for converging light emitted from a light source on an optical recording medium to record and reproduce information consists of a single lens having at least one aspheric surface. The following conditional expressions (1) to (3) are satisfied:N≦1.75 (1)0.5<f/f1<0.6 (2)0.8<d/(NA·De)<1.0 (3)where
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.