Patent ID: 6956800
Filing Date: 2005-10-18
Classification: G11B

Abstract:
1. A pre-pit detecting apparatus in which recording control information, for use of recording control upon recording record information on a recording medium, is recorded in advance by forming pre-pits, the apparatus comprising: a light beam applying device for applying a first light beam having first power and a second light beam having second power different from the first power to the pre-pits on a times-shared basis according to the record information when recording the recording information on the recording medium; a read signal generating device for generating read signals from electrical signals according to the amounts of reflected light of the respective beams; and a pre-pit signal detecting device for inputting the generated read signal and detecting a pre-pit signal from the input read signal, wherein said pre-pit signal detecting device detects a pre-pit signal from only the read signals input during the period of applying of the second light beam.