Patent ID: 7471612

Claim:
An optical recording medium suitable for recording or reproducing information by irradiating a laser beam at a wavelength between 395˜425 nm onto a recording surface in the optical recording medium, the laser beam being incident from a side of the optical recording medium through an objective lens having a numerical aperture of 0.62˜0.68, the optical recording medium comprising: at least first and second substrates, a reflective film formed between the first and second substrates, and at least one recording surface, the first and second substrates respectively having a thickness greater than 0.2 mm, wherein a total thickness of the optical recording medium is substantially 1.2 mm and a capacity of said recording medium is greater than 13.8 Gbytes per one recording surface, said laser beam being irradiated onto the recording surface with said wavelength between 395˜425 nm through said objective lens having said numerical aperture of 0.62˜0.68.