Objective lens for pickup and light pickup apparatus
US6512640B2 · kind B2 · utility
8Cited by
2References
21Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 4, 2002 |
| Grant date | Jan 28, 2003 |
| Priority date | — |
| Expiry date | Mar 5, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2007/13727
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An objective lens for use in an optical pickup apparatus to record or reproduce information in an optical information recording medium, comprises an aspheric surface, wherein the following conditional formula is satisfied: 1.1≦d1/f≦3 where d1 represents axial lens thickness and f represents a focal length.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.