PREGRAVE INFORMATION BRACKET WITH DEPORTED BRANDS, METHOD FOR PRODUCING THE BRANDS, AND METHOD FOR PRODUCING A RADIAL TRACKING ERROR SIGNAL, AND READING DEVICE FOR IMPLEMENTING THE METHOD.

摘要

The present invention relates to an information carrier comprising at least one face intended for the recording, along tracks, of optically readable information, the support being provided with pre-engraving zones (5) alternating with zones ( 4) for recording said information, the pre-engraving areas comprising discrete patterns materializing the average axis of the tracks. In each pre-engraving zone, the discrete patterns are constituted by marks (23 ', 33') centered midway between two adjacent tracks and having an optical width, as provided by a real optics of limited transfer function, in the direction perpendicular to the axis of the tracks, substantially equal to the optical width of the zone situated between two successive marks along said direction and in that, from one pre-engraving zone to the next, the marks (23 ', 33' ) have equal offsets and opposite signs with respect to the average axes of the tracks. BR/ The invention applies to digital optical disks. / P