Optical pickup device and objective lens for the optical pickup device
US7193954B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 22, 2004 |
| Grant date | Mar 20, 2007 |
| Priority date | — |
| Expiry date | Sep 29, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2007/13727
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical pickup apparatus includes first, second and third light sources; a light converging optical system including a first objective optical element and a second objective optical element, wherein the first objective optical element converges the light flux emitted from the first light source on a first information recording surface, the second objective optical element converges the light flux emitted from the third light source on a third information recording surface, and the first objective optical element or the second objective optical element converges the light flux emitted from the second light source on a second information recording surface; a lens holder holding the first objective optical element and the second objective element therein; and a chromatic aberration correcting element which corrects a chromatic aberration caused by a wavelength variation in a light flux emitted by the first light source.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.