G - Physics – 11 – B
Patent
G - Physics
11
B
352/32.2, 352/32
G11B 7/00 (2006.01) G11B 7/007 (2006.01) G11B 7/09 (2006.01) G11B 7/24 (2006.01) G11B 27/19 (2006.01) G11B 27/30 (2006.01)
Patent
CA 1190645
A MOBILE PRE-ETCHED DATA CARRIER AND AN OPTICAL TRACKING DEVICE USING SUCH A CARRIER ABSTRACT OF THE DISCLOSURE A mobile pre-etched data carrier is provided in which the pre-etching is formed by a succession of discrete non continuous elements materializing the mean axis of the tracks. The spatial distribution of these discrete elements may be uniform or not. In a first embodiment, each discrete element is formed by a smooth track section. In a second embodiment, each discrete element comprises several sections defining a particular code. In other preferred variations of the invention, each element comprises, besides a portion center- ed on the mean axis of the tracks, one or more portions off- set with respect to the axis. Finally, each of the pre-etch- ings may itself be preceded by an additional pre-etching element used for the purpose of synchronization. The track- ing device comprises photodetector means, measuring circuits comprising sampler-inhibitors or storage integrator circuits and sampling circuits. A radial tracking error is formed from the evolution of the signals detected during successive passages.
423068
Berthet Pierre
Bricot Claude
Gerard Jean-Louis
Goudreau Gage Dubuc
Thomson-Csf
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