Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1983-03-03
1985-05-28
Richardson, Robert L.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 46, G11B 700
Patent
active
045204691
ABSTRACT:
A tracking servo system for an optical-disc information reproducing apparatus includes (a) a light source for generating a light beam to scan a target track on an optical-disc wherein the information is stored as a series of pits arranged in the form of the track; (b) four photodetectors, arranged in two pairs with each pair intersecting the other and being disposed in a direction oblique to an image of the track for converting an image of the pit into respective electric signals; (c) a circuit for comparing the phases of the electric signals and for producing a tracking error signal ranging in accordance with the phase difference between the electric signals; and (d) a motor and lens for deflecting the light beam along a path perpendicular to the target track in response to the tracking error signal, whereby the light beam accurately scans the target track.
REFERENCES:
patent: 3962721 (1976-06-01), de Haan
patent: 3971002 (1976-07-01), Bricot et al.
patent: 4001494 (1977-01-01), Adler et al.
patent: 4410969 (1983-10-01), Maeda
Maeda Satoru
Nakane Hiroshi
Todokoro Shigeru
Richardson Robert L.
Tokyo Shibaura Denki Kabushiki Kaisha
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