Patent ID: 7920454

Claim:
An optical recording medium comprising: a first information layer, an intermediate layer and a second information layer sequentially disposed between a first substrate and a second substrate, wherein each information layer comprises a recordable recording layer comprising an organic dye and a groove is formed along the recording track, wherein a laser beam at a wavelength λ is irradiated from the first substrate side to perform any one of recording and reproducing of information by optical power modulation of binary or more, and wherein when the refraction index of the first substrate being n 1 , the refraction index of the intermediate layer being n 2 , the groove depth, the groove width and the track pitch of the first information layer being d 1 , w 1 , and p 1 respectively and the groove depth, the groove width and the track pitch of the second information layer being d 2 , w 2 and p 2 respectively, the following conditions are satisfied: 4λ/16 n 1 ≦d 1 ≦7λ/16 n 1 λ/16 n 2 ≦d 2 ≦3λ/16 n 2 or 4λ/16 n 2 ≦d 2 ≦7λ/16 n 2 0.2≦ w 1 /p 1 ≦0.55 0.2≦ w 2 /p 2 ≦0.55, and wherein the organic dye is a compound having a formula: