Apparatus for reading from and/or writing to optical recording media
US6788637B1 · kind B1 · utility
2Cited by
11References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 2, 2000 |
| Grant date | Sep 7, 2004 |
| Priority date | — |
| Expiry date | Apr 13, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/14
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An apparatus for reading from and/or writing to optical recording media on which data markings are arranged along tracks arranged next to one another. The apparatus according to the present invention comprises a light source, a focusing means and an intensity distribution converter. In the present invention, both the extent of the focus spot of the primary beam is reduced and the disadvantages occurring due to the secondary beams are reduced. In an exemplary embodiment, the intensity distribution converter comprises a filtering strip arranged in the region of the focusing means.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.