Record-carrier body provided with a relief structure of opticall

Details Record-carrier body provided with a relief structure of opticall Record-carrier body provided with a relief structure of opticall

1989-09-21

1990-09-25

Levy, Stuart S.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

3692751, 369109, G11B 724, G11B 726

Patent

active

049598228

ABSTRACT:
A record carrier body is disclosed which is, provided with sector addresses and servo-track portions. The maximum width of the servo-track portions is at least 60% of the track period, in a direction transverse to the track direction, and is at least of the order of twice the maximum width of the sector-address areas. This makes it possible to obtain an improved tracking signal in addition to a satisfactory address signal. An improved information signal can be obtained by recording the information in the lands between the servo tracks. An apparatus is disclosed for recording sector addresses and servo track portions on the record carrier body.

REFERENCES:
patent: 4325135 (1982-04-01), Dil et al.
patent: 4499574 (1985-02-01), Braat
patent: 4853912 (1989-08-01), Akasaka et al.

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