Optical disc device
US6891875B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 21, 2002 |
| Grant date | May 10, 2005 |
| Priority date | — |
| Expiry date | Mar 7, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/005
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An object of the present invention is to remove a laser beam source noise in an optical disc device.An optical disc device comprises: a laser beam source which outputs a laser beam, a reproducing signal beam-receiver which receives a signal beam from an optical disc and generates a reproducing signal, a beam-source monitoring beam-receiver which detects the laser beam from the laser beam source, and a beam splitter which divides the laser beam from the laser beam source into the beams to the reproducing signal beam-receiver and to the beam-source monitoring beam-receiver; an output signal from the beam-source monitoring beam-receiver being used for removing a noise contained in the reproducing signal from the reproducing signal beam-receiver through a noise cancellation calculation. In the configuration of the optical disc device, an output current of the beam-source monitoring beam-receiver is set so that a laser beam source noise caused by the laser beam source is greater than a circuit-related noise caused by a circuit including the beam receivers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.