Patent ID: 8147941

Claim:
A multi-information-layer recording medium comprising: a plastic substrate manufactured by an injection method, and having physical patterns on its surface; a first information recording layer formed on the substrate; and at least one set of a translucency spacer, layered on the first information recording layer and having physical patterns on its surface, and an information recording layer formed on the translucency spacer, wherein an average thickness of the translucency spacer in an information zone is not more than 15 μm and a difference between a minimum value and a maximum value in a thickness of the translucency spacer is not more than 2 μm; and wherein when the average thickness of the translucency spacer in the information zone is not more than 3 μm, the difference between the minimum value and the maximum value in the thickness of the translucency spacer is not more than 0.5 μm.