G - Physics – 11 – B
Patent
G - Physics
11
B
352/32.2
G11B 5/82 (2006.01) G11B 7/00 (2006.01) G11B 7/007 (2006.01) G11B 7/12 (2006.01) G11B 7/24 (2006.01)
Patent
CA 1152644
27.12.1978 1 PHN.9259 ABSTRACT: A record carrier is described having an optical- ly 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 suit- able positional error signal are obtained if the angle of` inclination of the walls of the information area lies be- tween 65° and 85° and the phase depth of the information areas lies between 95° and 140°.
337901
N.v. Philips Gloeilampenfabrieken
Van Steinburg C.e.
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