Optical pickup apparatus with objective optical system and guiding optical system
US7924683B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 30, 2005 |
| Grant date | Apr 12, 2011 |
| Priority date | — |
| Expiry date | Feb 28, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2007/0006
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical pickup apparatus comprises a first light source for emitting a first light flux having first wavelength λ1 (430 nm>λ1>380 nm), a second light source for emitting a second light flux having second wavelength λ2 (λ2>λ1), an objective optical system having phase structure thereon, and at least one moving optical element for guiding the light flux into the objective optical system, the moving optical element being moved in a direction parallel to an optical axis corresponding to the first light wavelength λ1 and the second light wavelength λ2, wherein the objective optical system has phase structure and satisfies M1=M2=0, where, M1 and M2 denote a first and second magnifications of the objective optical system for recording and/or reproducing the information on or from the first and second optical information media.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.