Hitachi Maxell, Limited

Norio Oota

Katsusuke Shimazaki

Masafumi Yoshihiro

Akira Kashiwakura

Shin-Itsu Kinoshita

Hisanori Sugiyama

A magnetooptic recording medium which includes a substrate and a magnetooptic recording film thereon, the substrate having a surface comparted into a plurality of tracks on which magnetooptic recording signals are recorded, and a part of the tracks, selected from the plurality of tracks, including clusters of pre-pits wherein a variation of a change in light amount due to local birefringence in the vicinity of the pre-pits is not more than 20% with respect to a change in light amount in the absence of the local birefringence, when signals from the tracks with recorded magnetooptic recording signals are measured by changes in light amount on the basis of Kerr rotational angles of reflected light from the medium, which magnetooptic recording medium can be effectively used for a ZCAV system.

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Kitasouma-gun, Japan

Norio Oota