Record carrier containing information in an optically readable radiation reflecting information structure
AssigneeU.S. Philips Corporation
InventorJan G. Dil
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Abstract
A record carrier is described having an optically readable radiation-reflecting information structure, comprising information areas arranged in information tracks, which areas are spaced from each other by intermediate areas, the information areas having oblique walls. It is demonstrated that a suitable information signal and a suitable positional error signal are obtained if the angle of inclination of the walls of the information area lies between 65.degree. and 85.degree. and the phase depth of the information areas lies between 95.degree. and 140.degree..
Claims8
A record carrier containing information in an optically readable radiation reflecting information structure comprising information areas, which are arranged in information tracks, which are spaced from each other in the track direction by intermediate areas, and which have a phase depth which is substantially constant over the entire record carrier, characterized in that the cross-section, transverse to the track direction, of the information areas is substantially V-shaped, that the phase depth of the information areas has one value between 100.degree. and 125.degree., and that the angle of inclination between the walls of the information areas and the normal to the record carrier is substantially constant and has a value between 65.degree. and 85.degree..
Dependencies are inferred from the claim text.