Optical pickup apparatus for use on a multi-layered optical information storage medium
US8107348B2 · kind B2 · utility
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9Claims
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Key dates
| Filing date | Jun 1, 2009 |
| Grant date | Jan 31, 2012 |
| Priority date | — |
| Expiry date | Jun 28, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2007/0013
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical pickup apparatus for use on multi-layered optical information storage medium in which influences of reflected light, which result in crosstalk from adjacent layers in a multi-layered optical disk, are mitigated. In an astigmatic optical system of the optical pickup, a first composite segmented wave plate having a segmentation direction that is in the same direction as the focal line that is close to the astigmatic optical system, a second composite segmented wave plate of the same segmentation direction, and an analyzer are inserted.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.