| US 7,542,404 B2 | ||
| Optical recording media | ||
| Keiichiro Yusu, Yokohama (Japan); Sumio Ashida, Yokohama (Japan); Tsukasa Nakai, Hino (Japan); Shinichi Tatsuta, Tokyo (Japan); and Hideki Ito, Kawasaki (Japan) | ||
| Assigned to Kabushiki Kaisha Toshiba, Tokyo (Japan) | ||
| Filed on Jul. 15, 2005, as Appl. No. 11/181,984. | ||
| Claims priority of application No. 2004-286584 (JP), filed on Sep. 30, 2004. | ||
| Prior Publication US 2006/0077869 A1, Apr. 13, 2006 | ||
| Int. Cl. G11B 7/24 (2006.01) | ||
| U.S. Cl. 369—275.1 | 22 Claims |
| 1. An optical recording media, comprising:
a disc substrate; and
two or more recording layers arranged apart from each other with a dielectric layer interposed therebetween to cause optical
change simultaneously by irradiation with light,
wherein a first recording layer positioned nearest the disc substrate has a higher optical change temperature and a higher
extinction coefficient compared with those of a second recording layer and any later recording layer,
wherein the first recording layer and the second recording layer are arranged apart from each other by a distance of 5 nm
or more and 100 nm or less.
|