Optical format compatible recording and/or playback device
US6198706A · kind A · utility
2Cited by
1References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 28, 1995 |
| Grant date | Mar 6, 2001 |
| Priority date | — |
| Expiry date | Nov 28, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2007/0006
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The invention relates to a method and an arrangement for a compatible recording and/or reproduction device for the reproduction of information from, and/or for recording on, optical information carriers (CD) having differing information storage densities. A light source is used which is adapted to the highest storage density of the information carriers (CD) to be used as regards wavelength and light spot dimensions and the light directed onto the information carrier (CD) is defocused by a defocusing means for the enlargement of the light spot for information carriers (CD) of lower storage density.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.