Apparatus for enabling an autotrack circuit of an optical disc r

Details Apparatus for enabling an autotrack circuit of an optical disc r Apparatus for enabling an autotrack circuit of an optical disc r

1985-04-03

1987-09-29

Cardillo, Raymond F.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 46, 369 54, 369 58, G11B 2110, G11B 7095

Patent

active

046972587

ABSTRACT:
Apparatus for reading a disc-shaped record carrier with a light beam. A radial positioning apparatus controls the radial position of the light beam spot on the information track of a record carrier. A lock-in system is provided for switching the radial positioning apparatus into a tracking mode when the light spot is positioned to coincide with the information track. The direction of relative radial movement between the light spot and the information track is detected and a first control signal is supplied to initiate radial tracking of the information track when the relative radial movement between the reading beam and the information track changes from an outward movement of the light spot over the track to an inward movement of the light spot over the track. At the instant the transition occurs, the radial positioning apparatus is enabled to permit the read spot to follow the information track.

REFERENCES:
patent: 4037252 (1977-07-01), Janssen
patent: 4338682 (1982-07-01), Hosaka et al.
patent: 4365324 (1982-12-01), Michaelis
patent: 4539665 (1985-09-01), Iso et al.
patent: 4544872 (1985-10-01), Hirano et al.

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