Electric circuit for providing a position indicator signal in a system for multilayer optical disk storage
US5757743A · kind A · utility
16Cited by
9References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 1, 1996 |
| Grant date | May 26, 1998 |
| Priority date | — |
| Expiry date | Apr 1, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/0917
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Laser light is focused in an accurate manner on selected layers in a multilayer optical disk recording system by means of an analysis of output electrical signals from a dithered source which results in the production of an electrical signal which is proportional to an amount by which the parts of the system are to be relatively moved in order to achieve the desired focus on one of the layers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.