Apparatus for reading a disk-shaped record carrier

Details Apparatus for reading a disk-shaped record carrier Apparatus for reading a disk-shaped record carrier

1982-04-05

1984-05-01

Psitos, Aristotelis M.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 46, 250202, G11B 700, G11B 2110

Patent

active

044465459

ABSTRACT:
An optical read system for a disk-shaped record carrier. By means of a tracking system the read spot is centerd at the information track. The control signal for this tracking system is obtained by means of additional radiation spots which are disposed on radially opposite sides of the read spot. By subjecting the detection signals corresponding to these additional radiation spots and the read spot to a special operation a control signal is obtained which is highly independent of variations in disk parameters, variations in the intensity of the radiation beams and focussing errors.

REFERENCES:
patent: Re29963 (1979-04-01), Janssen
patent: 4001494 (1977-01-01), Adler et al.
patent: 4037252 (1977-07-01), Janssen
patent: 4236232 (1980-11-01), Jansen et al.
patent: 4359635 (1982-11-01), Gross

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