Publication number: 20070037093
Abstract: An phase-change optical disk comprises a substrate, a first protective layer, a first thermostable layer, a recording layer, a second thermostable layer, a second protective layer, an absorptance control layer, and a heat-diffusing layer which are provided in this order from a side on which a laser beam comes thereinto, wherein a recording layer material has composition ratios which are within a range surrounded by composition points of B3 (Bi3, Ge46, Te51), C3 (Bi4, Ge46, Te50), D3 (Bi5, Ge46, Te49), D5 (Bi10, Ge42, Te48), C5 (Bi10, Ge41, Te49), and B5 (Bi7, Ge41, Te52) on a triangular composition diagram. Recrystallization is not caused even when information is recorded on an inner circumferential portion, a reproduced signal is scarcely deteriorated even when rewriting is performed multiple times, and any erasing residue of amorphous matters scarcely appears at an outer circumferential portion.
Type:
Application
Filed:
September 29, 2006
Publication date:
February 15, 2007
Applicant:
HITACHI MAXELL, LTD.
Inventors:
Makoto Miyamoto, Reiji Tamura, Akira Kashiwakura, Hiroshi Shirai, Yoshihiro Ikari, Makoto Iimura, Yumiko Anzai, Kazuyo Umezawa