Patent ID: 8077580
Filing Date: 2011-12-13
Classification: G11B

Abstract:
1. An optical information recording and reproducing apparatus configured to irradiate a reference light emitted from an optical pickup and a signal light emitted from the optical pickup to record, and to reproduce digital information by using holography, the optical information recording and reproducing apparatus comprising: an optical pickup; a phase conjugate optical system; a disc cure optical system; a defect discrimination optical system; and an optical detector configured to receive a light emitted from the defect discrimination optical system and transmitted through or reflected from an optical information recording medium; wherein the optical information recording and reproducing apparatus is configured to determine, after receiving data to be recorded on an optical information recording medium and before or during pre-curing an area designated for recording received data on the optical information recording medium, whether or not a defect is present in the area designated for recording received data on the optical information recording medium based on the light emitted from the defect discrimination optical system; and wherein if a defect is found, changing the area designated for recording received data on the optical information recording medium, but if no defect is found, proceeding with pre-curing the area designated for recording received data on the optical information recording medium.