Optical pickup lens
US7742383B2 · kind B2 · utility
4Cited by
7References
17Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 7, 2007 |
| Grant date | Jun 22, 2010 |
| Priority date | — |
| Expiry date | Feb 9, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/13922
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical pickup lens for focusing a light beam from a laser light source on an optical information recording medium is a single lens. The optical pickup lens has two surfaces, and a surface R2 opposite to a surface R1 closer to the laser light source has a continuous shape. When the surface R2 has radii h1, h2 and h3 (h1<h2<h3) from an optical axis to a lens periphery, and where sags in the radii h1, h2 and h3 are sag1, sag2 and sag3, and differentials in the sags are Δsag1, Δsag2 and Δsag3, respectively, 0>Δsag1>Δsag2 and Δsag2<Δsag3 are satisfied.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.