aufzeichnungstraeger in which data in a visually auslesbaren information structures are stored, and a device for reading the same

摘要

A record carrier having information stored thereon in tracks comprised of areas separated from each other in the track direction by intermediate regions which are optically distinguishable from the areas. The areas in adjacent tracks have a different phase depth and are therefore also optically distinguishable from each other so that the tracks may be crowded closer together. A player is also disclosed having two detectors offset from each other in the direction of the tracks and producing signals that are alternately added and subtracted to produce a tracking signal.