OPTICAL RECORDING MEDIUM AND OPTICAL DISK DEVICE

摘要

An optical recording medium and an optical disk device for realizing the prevention of cross-write and the homogenization of a reproduced signal, and easily ensuring compatibility with a reproduction-only disk. An optical recording medium comprising a substrate (1) formed with grooves (2) in the surface thereof, an optical recording layer (3) formed on the substrate and having an uneven shape matching the grooves, and a light-transmitting protection film (4) formed on the optical recording layer, recording or reproducing to/from the substrate being made by being applied a light beam (LB) that is condensed by lenses (12, 14) having numerical apertures of 0.85 +/- 0.1 and has a wavelength of 405 +/- 5 nm, wherein a recording or reproducing light beam applied to the optical recording layer from a protection film side is used, either one of that portion, corresponding to a recess of the uneven shape distal from a recording or reproducing light applying side, of the optical recording layer and that portion, corresponding to a protrusion proximal to the side, only is used as a recording area, a track pitch is 0.32 +/- 0.01 mu m, and a protrusion-to-recess depth D2 ranges 19-24 nm.