OPTICAL INFORMATION RECORDING MEDIUM AND OPTICAL INFORMATION RECORDING MEDIUM DRIVING APPARATUS

摘要

An optical information recording medium (200) has a structure wherein a light transmitting layer (10), a first information recording layer (20), an intermediate layer (30), a second information recording layer (40) and a substrate (50) are laminated in this order from a reproducing beam incoming side. The first information recording layer (20) reads out information, and the second information recording layer (40) includes a region where information can be rewritten. The first information recording layer (20) has light transmitting characteristic, and the reflectance of the first information recording layer (20) at a reproducing beam wavelength is higher than 0.4% but not more than 2.2%. Thus, by the hybrid optical information recording medium, information in the medium can be reproduced even by a driving apparatus applicable to old standard optical information recording media having a small number of information recording layers, and the recording capacity can be improved by adding a reproduction-only layer (ROM layer) or an additional recording layer (R layer) to the old standard optical information recording media.