Use of a laser light source as a detector via a dithering modulation
US5684782A · kind A · utility
15Cited by
9References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 1, 1996 |
| Grant date | Nov 4, 1997 |
| Priority date | — |
| Expiry date | Apr 1, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01S5/06243
- WIPO fieldOptics
- WIPO sectorInstruments
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.