Communications: electrical – Digital comparator systems
Patent
1978-06-27
1979-02-06
Boudreau, Leo H.
Communications: electrical
Digital comparator systems
1791004D, 358128, 360 72, 365215, 365234, G11B 700
Patent
active
041386639
ABSTRACT:
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.
REFERENCES:
patent: 3962688 (1976-06-01), Westerberg
patent: 4059841 (1977-11-01), Bricot et al.
patent: 4063287 (1977-12-01), Van Rosmalen
patent: 4067044 (1978-01-01), Maeda et al.
patent: 4074312 (1978-02-01), Van Rosmalen
patent: 4093832 (1978-06-01), Isaacson et al.
patent: 4094010 (1978-06-01), Pepperl et al.
patent: 4094013 (1978-06-01), Hill et al.
Lehureau Jean-Claude
Oprandi Pierre
"Thomson-Brandt"
Boudreau Leo H.
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