| 摘要 |
In the multi-layer information medium having a plurality of information-storing layers according to the present invention, all of the information-storing layers exhibits excellent reading properties. The multi-layer information medium also exhibits good mechanical precision. The optical information medium has at least two annular information-storing layers each storing recorded information and/or servo information on a disk-shaped substrate formed with a center hole or between a pair of disk-shaped substrates each formed with a center hole, and at least one of the information-storing layers is recorded or read by the recording beam or the reading beam which has passed through other information-storing layer(s). The medium has at least two annular resin layers each having an annular raised rim at its inner periphery, and the annular resin layers are formed such that their inner peripheries are in the form of steps and the annular raised rim of the resin layer is prevented from being covered by the inner periphery of the overlying resin layer.
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