Record carrier with tracks of different phase depths

Details Record carrier with tracks of different phase depths Record carrier with tracks of different phase depths

G - Physics

11

B

352/32.4

G11B 7/24 (2006.01) G11B 7/007 (2006.01) G11B 7/013 (2006.01) G11B 7/085 (2006.01) G11B 7/09 (2006.01)

Patent

CA 1137628

PHN 9083 ABSTRACT: A record carrier is described having an optically readable information structure of trackwise arranged ares. If the adjacent tracks differ from each other in that their areas have different a phase depth, the tracks can be situated neater each other and can still be read separately. The information density can then be increased. The record carrier is read with the aid of two detectors which are situated in the far field and which are offset from each other in the track direction. The signals from these detectors are added to and subtracted from each other respectively for reading tracks with a larger phase depth and tracks with a smaller phase depth.

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