Hitachi, Ltd.

Other

Hitachi Maxell, Limited

Koichi Moritani

Motoyasu Terao

Akemi Hirotsune

Yasushi Miyauchi

Makoto Miyamoto

Tetsuya Nishida

Nobuhiro Tokushuku

Keikichi Andoo

Yukio Fukui

Takashi Naito

Hiroki Yamamoto

Toshimichi Shintani

Takashi Namekawa

The optical recording medium has sandwiched between protective layers a mask layer whose refractive index is changed in one part within a light spot when irradiated with a laser beam of 2 to 4 mW. In a region where the refractive index is changed or in other remaining regions, the difference in the amount of reflected light between the crystalline state and the amorphous state is so small that a reproduced signal is difficult to identify. By reducing the size of a portion where the reproduced signal can be seen, it is possible to read high-density recorded information.

Optical recording medium and optical memory device

An information recording medium which includes at least a recording layer, and first and second metallic layers disposed on an opposite side of an energy beam incident side of the recording layer and having different compositions, and in which the first one of the first and second metallic layers located closer to the recording layer contains Al, Ag, Au, Pt and Pd as its main components and a sum of contents of these atoms is 60% or more. Thereby recording and reproducing of information can be realized with a high reliability.

Information recording medium and information recording and reproducing apparatus using the same

Information recording medium and information recording and reproducing

Growing community of inventors

Yokohama, Japan

Koichi Moritani