Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1987-04-06
1989-06-27
Richardson, Robert L.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
G11B 700
Patent
active
048436020
ABSTRACT:
An apparatus for writing and/or reading information in substantially concentric tracks on a disc-shaped record carrier. The tracks are scanned by a beam of radiation focussed into a light spot thereon, and detection means responsive to the light reflected from the tracks generates a radial error signal which varies substantially proportionally to the radial excursion of the light spot relative to a track over a control range of p/4, p being the track pitch. The detection means comprises an error signal correction circuit for deriving from such signal a control signal (S.sub.1) having a substantially proportional control range for excursions of the light spot up to a value exceeding p/2 from a track. The control signal is supplied to radial positioning means, and controls the radial position of the light spot on a track. Proportional radial positioning is achieved even for excursions of the light spot up to a maximum of 3p/4 from a track, the light being returned to the correct track even after such an excursion. Such positioning control is highly immune to mechanical shocks.
REFERENCES:
patent: 4359635 (1982-11-01), Gross
patent: 4446545 (1984-05-01), Van Dijk
patent: 4530079 (1985-07-01), Millar
patent: 4703468 (1987-10-01), Baba et al.
Richardson Robert L.
Tamoshunas Algy
U. S. Philips Corporation
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