Patent ID: 8369200

Claim:
An optical recording medium having a plurality of information recording surfaces, the optical recording medium comprising: a first information recording surface closest to a medium surface of the optical recording medium where light is incident; a second information recording surface second closest to the medium surface; a third information recording surface third closest to the medium surface; a cover layer having a refractive index nr 1 and formed between the medium surface and the first information recording surface; a first intermediate layer having a refractive index nr 2 and formed between the first information recording surface and the second information recording surface; and a second intermediate layer having a refractive index nr 3 and formed between the second information recording surface and the third information recording surface, wherein in a case where actual thicknesses tr 1 , tr 2 , and tr 3 of the cover layer, the first intermediate layer, and the second intermediate layer are respectively converted into effective thicknesses t 1 , t 2 , and t 3 of the respective corresponding layers each having a predetermined standard refractive index “no”, defocus values of both the actual thicknesses and the effective thicknesses are the same, the effective thicknesses t 1 , t 2 , and t 3 satisfy | t 1−( t 2+ t 3)|≧1 μm, and a difference between any two values of the thicknesses t 1 , t 2 , and t 3 is set to 1 μm or more in any case, the standard refractive index “no” is set to 1.60.