G - Physics – 11 – B
Patent
G - Physics
11
B
352/32.4
G11B 7/007 (2006.01) G11B 7/013 (2006.01) G11B 7/09 (2006.01) G11B 7/24 (2006.01) G11B 7/26 (2006.01)
Patent
CA 2039527
21 ABSTRACT OF THE DISCLOSURE Disclosed is an information medium having at least one face designed for the recording, along the tracks, of optically readable information, the medium being provided with pre-etched zones alternating with zones designed for the recording of said information, the pre-etched zones having discrete patterns that define the mean axis of the tracks. In each pre-etched zone, the discrete patterns are constituted by marks centered at mid-distance between two adjacent tracks and having an optical width, as given by a real optical system with limited transfer function, in the direction perpendicular to the axis of the tracks, that is substantially equal to the optical width of the zone located between two successive marks along said direction and, from one pre-etched zone to the next one, the marks have equal offsets, with opposite signs, with respect to mean axes of the tracks.
Bec Daniel
Benguigui Michel
Fabro Didier
Art Tech Gigadisc "atg"
Goudreau Gage Dubuc
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