Optical element, optical element manufacturing method and optical pickup device
US7907499B2 · kind B2 · utility
2Cited by
9References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 9, 2007 |
| Grant date | Mar 15, 2011 |
| Priority date | — |
| Expiry date | Jan 18, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2007/0013
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical element includes: opposing surfaces each including two areas each of which includes a fine-periodic structure. The fine-periodic structures of the two areas have different directions from each other in each of the opposing surfaces. One of the opposing surfaces with the fine-periodic structures works as a quarter-wave plate and the other of the opposing surfaces with the fine-periodic structures works as a polarization separating element. A boundary of the two areas in one of the opposing surfaces and a boundary of the two areas in the other of the opposing surfaces are positionally identical.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.