Ricoh Company, Ltd.

Michiaki Shinozuka

Hitoshi Nakamura

Makoto Harigaya

Yoshiyuki Kageyama

Wasaburo Ohta

Hiroko Iwasaki

Yukio Ide

Isao Miyamoto

Masashi Nakazawa

Masaaki Ishiyama

Toshihiko Yoshio

Yuuzi Onodera

A phase-change type information recording medium composed of a substrate and a recording layer formed on the substrate, which recording layer is composed of a recording material with the composition thereof in terms of atomic percentage being represented by general formula:

Phase-change type information recording medium

An optical information recording medium is composed of a transparent substrate, a recording layer provided on the substrate, which is transparent with respect to a light beam for reproducing information recorded in the recording layer, a reflection layer provided on the recording layer, and an anti-reflection layer provided on the back side of the substrate opposite to the recording layer. The anti-reflection layer is composed of a plurality of overlaid layers, and at least one of the layers being a transparent electroconductive layer and the other layers are transparent insulating layers.

Optical information recording medium having multi-layered structures for

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Yokohama, Japan

Michiaki Shinozuka