Patent ID: 7623433

Claim:
An optical recording medium comprising: a first disk comprising a base member of light transmissive material which is formed, on an information-recording side of the first disk, with a plurality of groove tracks of width W G0 and land tracks of width W L0 alternating with said groove tracks, each of said groove and land tracks being coated with a first optical recording film for receiving a laser beam which is incident on the opposite of the first disk and a reflecting film on the first optical recording film for partially reflecting optical energy; a second disk comprising a base member which is formed, on an information-recording side of the second disk facing the information-recording side of the first disk, with a plurality of land tracks of width W L1 and groove tracks of width W G1 alternating with the land tracks, said land tracks of the second disk corresponding in position to said groove tracks of the first disk and said groove tracks of the second disk corresponding in position to said land tracks of the first disk, each of said land and groove tracks of the second disk being coated with a second optical recording film for receiving light from the corresponding groove and land tracks of the first disk and a reflecting film on the recording film, the first optical recording film of the first disk being closer in distance to the laser beam than the second optical recording film of the second disk; and an intermediate member of light transmissive material disposed between said first and second optical recording films, wherein a ratio of W G1 /W L1 is substantially greater than unity and is greater than a ratio W G0 /W L0 so that carrier-to-noise ratios of said first and second disks are substantially equal to each other.