G - Physics – 11 – B
Patent
G - Physics
11
B
352/32.2
G11B 7/00 (2006.01) G05B 19/39 (2006.01) G11B 7/085 (2006.01) G11B 17/00 (2006.01)
Patent
CA 1109148
AN OPTICAL READER FOR INFORMATION DISCS EQUIPPED WITH MEANS FOR AUTOMATIC ACCESS TO THE INFORMATION ABSTRACT OF THE DISCLOSURE: The optical reader, for information discs of which the items of information are locatable by addresses previously recorded on each of the grooves forming the track, comprises a device for counting the number of grooves traversed during search phases which simultaneously uses the envelope of the reading signal and the signal representing the radial error in the position of the head relative to the nearest track, for algebraically counting the number of tracks traversed. After comparison with the number of grooves to be traversed, the counting device controls the deceleration of the radial advance when the spot is at a predetermined distance from the groove to be reached and also its total stoppage and the closure of the radial servocontrol loop when the groove is reached.
306583
Lehureau Jean-Claude
Oprandi Pierre
Robic Robic & Associes/associates
Thomson-Brandt
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