Optical pickup device
US7190657B2 · kind B2 · utility
5Cited by
2References
21Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 2, 2004 |
| Grant date | Mar 13, 2007 |
| Priority date | — |
| Expiry date | Oct 14, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2007/0006
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical pickup device including a dual wavelength light source module for emitting a selected one of two light beams having different wavelengths, a dual grating for splitting, into three beams, the selected light beam emitted from the dual wavelength light source, and a hologram for focusing the three beams of the selected light beam onto a photodetector having typical 8-section patterns such that the three beams of the selected light beam are focused onto the same spots as those of the other light beam, respectively.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.