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.
