Patent ID: 7095693

Claim:
An optical disc device in which a main beam spot and sub-beam spots are formed on an information recording surface of an optical disc with irradiation of a laser beam, and laser power of said laser beam is intermittently boosted to record desired data on said optical disc by said main beam spot, said optical disc device comprising: light receiving means for receiving return light, said return light corresponding to said sub-beam spots and said main beam spot, said sub-beam spots including a sub-beam spot formed at a preceding side with respect to a scan of said main beam spot and, for outputting a light detection result; correcting means for suppressing changes in signal level of the light detection result caused upon boosting of the laser power of said laser beam and for subtracting information from said return light portion corresponding to said preceding sub-beam spot, said information being a portion of said return light corresponding to the main beam spot; and determining means for determining the light detection result obtained through said correcting means, and detecting defects on said optical disc.