Patent Number: 8,441,905

Title: Optical information recording medium and optical information processing apparatus

Abstract: This invention allows super-resolution reproduction with which a better bER value is attainable, when information is recorded by a random pattern including a mark length not longer than a resolution limit, by use of a highly versatile signal decoding method. Information is recorded as marks and spaces coded by RLL(1,7) modulation, which each of the marks and spaces have one of a plurality of lengths, and 2T marks and 2T spaces of the marks and spaces being formed are shorter than 0.12 .mu.m. An information recording layer (20) includes a reproduction film (21) and a reflective film (22) which are provided in this order from a side from which reproducing light is incident, which reproduction film is made of (i) zinc oxide, (ii) strontium titanate, (iii) titanium oxide, (iv) cerium oxide, or (v) a material including at least one of the (i) through (iv), and which reflective film is made of tantalum or titanium.

Inventors: Mori; Go (Osaka, JP), Yamada; Hirohisa (Osaka, JP), Yamamoto; Masaki (Osaka, JP), Harada; Yasuhiro (Osaka, JP), Tajima; Hideharu (Osaka, JP), Maeda; Shigemi (Osaka, JP), Murakami; Yoshiteru (Osaka, JP)

Assignee: Sharp Kabushiki Kaisha

International Classification: G11B 7/00 (20060101)

Expiration Date: 2021-05-14 0:00:00