Double-disk optical recording medium

An optical recording/playback apparatus comprising:

• 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 WG0 and land tracks of width WL0 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 WL1 and groove tracks of width WG1 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, wherein WG1/WL1 is substantially greater than unity and is greater than a ratio WG0/WL0 so that carrier-to-noise ratios of said first and second disks are substantially equal to each other, and
• an intermediate member of light transmissive material disposed between said first and second optical recording films,
• an optical head assembly for directing a laser beam onto said recording medium;
• a light detector for detecting light from said recording medium;
• and
• tracking and focusing control means connected to said light detector for controlling said optical head assembly so that said laser beam is incident on at least one of said groove tracks and land tracks of said first disk and at least one of said land tracks and groove tracks of said second disk.