Optical disc device and control method for optical disc device

An optical disc device comprising:

• a light source for emitting a laser beam;
• a diffraction grating for generating a main optical beam and at least first and second optical beams from the laser beam emitted from said light source, and forming a main beam spot and sub-beam spots on an information recording surface of an optical disc;
• a photo detector for receiving a return light corresponding to one of said sub-beam spots, which is formed on preceding side with respect to scan of said main beam spot, and outputting a light detection result;
• and
• a determination circuit for determining the light detection result of said photo detector, and detecting the presence of defects on said optical disc.

A control method for 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 method comprising the steps of:
• suppressing changes in signal level of a light detection result caused upon boosting of the laser power of said laser beam, the light detection result being obtained by receiving a return light corresponding to one of said sub-beam spots, which is formed on preceding side with respect to scan of said main beam spot;
• and
• determining the light detection result and detecting the presence of defects on said optical disc.

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 a return light corresponding to one of said sub-beam spots, which is formed on succeeding side with respect to scan of said main beam spot, and 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
• determining means for processing the light detection result obtained through said correcting means, and determining an error in the data recorded on said optical disc by said main beam spot and an error in address data obtained from said optical disc.

An optical disc device comprising:

• a light source for emitting a laser beam;
• a diffraction grating for generating a main optical beam and at least first and second optical beams from the laser beam emitted from said light source, and forming a main beam spot and sub-beam spots on an information recording surface of an optical disc;
• a photo detector for receiving a return light corresponding to one of said sub-beam spots, which is formed on succeeding side with respect to scan of said main beam spot, and outputting a light detection result;
• and
• a determination circuit for processing the light detection result obtained from said light receiving means, and determining an error in the data recorded on said optical disc by said main beam spot and an error in address data obtained from said optical disc.

A control method for 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 method comprising the steps of:
• suppressing changes in signal level of a light detection result caused upon boosting of the laser power of said laser beam, the light detection result being obtained by receiving a return light corresponding to one of said sub-beam spots, which is formed on succeeding side with respect to scan of said main beam spot;
• and
• processing the light detection result, and determining an error in the data recorded on said optical disc by said main beam spot and an error in address data obtained from said optical disc.