Optical head and optical disc apparatus for focusing a collimated laser beam
US6781945B2 · kind B2 · utility
2Cited by
6References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 4, 2001 |
| Grant date | Aug 24, 2004 |
| Priority date | — |
| Expiry date | Sep 24, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/1398
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.