Optical pickup device
US8036090B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 14, 2010 |
| Grant date | Oct 11, 2011 |
| Priority date | — |
| Expiry date | Apr 16, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2007/0013
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Provided is an optical pickup device capable of stabilizing a tracking signal and a focusing signal and of preventing quality deterioration of a data signal by eliminating a multi-layer crosstalk. Of reflected lights from a multi-layer disc, a reflected light from a target layer is split into two by a light flux splitting optical system so that the reflected light is spread out toward two directions with respect to a central line, and then the split lights are condensed. In this case, a reflected light from another layer does not reach a condensing position of the reflected light from the target layer, and only the reflected light from the target layer can be detected by a detector. Accordingly, a crosstalk from the another layer is eliminated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.