Patent Number: 8,576,688

Title: Optical data recording medium and method for reproducing recorded data

Abstract: An optical data recording medium, in which irradiation of a light beam is used for recording and/or reproducing data includes (i) a substrate having an a rise and/or a recess which are a light-incident surface, (ii) a reflective layer, provided on the light-incident surface of the substrate, for reflecting the light beam, (iii) a light absorption layer for converting, to heat, a light of the light beam to heat on the surface of the reflective layer, (iv) a reproducing layer, provided on the surface of the heat-light converting layer, having a transmittance that changes in accordance with a light intensity distribution of the light beam. The optical data recording medium is excellent in super-resolution property, and enables reproduction of a shorter mark length.

Inventors: Tajima; Hideharu (Izumi, JP), Takamori; Nobuyuki (Kitakatsuragi-gun, JP), Mori; Go (Nara, JP), Yamamoto; Masaki (Yamatokoriyama, JP)

Assignee: Sharp Kabushiki Kaisha

International Classification: G11B 7/24 (20130101)

Expiration Date: 1/05/12017