Optical pickup apparatus for recording or reproducing information for an optical information recording medium and objective lens for optical pickup apparatus
US7639589B2 · kind B2 · utility
1Cited by
32References
16Claims
0Family size
Assignee
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Key dates
| Filing date | Dec 17, 2007 |
| Grant date | Dec 29, 2009 |
| Priority date | — |
| Expiry date | Dec 17, 2027 |
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.