Mitsubishi Chemical Corporation

Kyuuya Narita

Toshifumi Kawano

Hideharu Takeshima

Masanobu Hodohara

A magneto-optical recording medium having a writing layer formed on a transparent substrate provided with a groove having a flat bottom surface and a flat land, so that writing or readout is carried out on either the groove or the land only by irradiating a laser beam from the substrate side, wherein the sum (.alpha.+.beta.) of a phase shift .alpha. of a reflected light of a readout beam by the substrate and a phase shift .beta. thereof by a layer structure on the transparent substrate, is made to have an opposite sign to a phase shift .gamma. by interference of reflected lights from the groove and the land.

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Yokohama, Japan

Kyuuya Narita