OPTICAL RECORDING MEDIUM, INFORMATION RECORDING OR REPRODUCING METHOD AND INFORMATION RECORDING OR REPRODUCING APPARATUS

摘要

PROBLEM TO BE SOLVED: To improve quality of servo signals and reproducing signals by preventing light convergence on the back of the surface of an optical recording medium and reducing interference of light reflected from recording surfaces of the optical recording medium.

SOLUTION: The optical recording medium 40 includes at least three information recording surfaces, and satisfies d1<(d4-d1), where d1 is a distance from a surface 40z of the optical recording medium 40 to a first information recording surface 40a that is the nearest to the surface 40z and d4 is a distance from the surface 40z to a fourth information recording surface 40d that is the most distant from the surface 40z, and satisfies dmin≥8 μm, where dmin is a minimum interlayer thickness between the at least three information recording surfaces.

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