Optical disc device

Details Optical disc device Optical disc device

2005-05-10

2005-05-10

Vu, David (Department: 2828)

Coherent light generators

Particular active media

Active media with particular shape

C372S043010, C372S044010, C372S045013, C372S046012, C372S049010, C372S049010, C372S049010, C372S050121

Reexamination Certificate

active

06891875

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.

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