Objective lens for optical recording/reproducing device
US7342865B2 · kind B2 · utility
1Cited by
6References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 24, 2003 |
| Grant date | Mar 11, 2008 |
| Priority date | — |
| Expiry date | Jan 2, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/0065
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
There is provided an objective lens which has positive refractive power and has a single lens element having an incident surface from which the collimated beam enters and an exit surface from which the collimated beam emerges. Further, the incident surface and the exit surface are configured to be rotationally symmetrical aspherical surfaces. At least within an effective diameter of the single lens element, the incident surface and the exit surface are symmetrical with respect to a plane perpendicular to an optical axis of the single lens element and have the same shape.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.