Optical information medium having paired wobble pitts with conti

Details Optical information medium having paired wobble pitts with conti Optical information medium having paired wobble pitts with conti

1988-10-20

1991-02-26

Levy, Stuart S.

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

3692751, 3692753, G11B 724, G11B 7007

Patent

active

049966820

ABSTRACT:
The present invention relates to an optical information medium for recording and reproducing information optically. Particularly, it is concerned with a so-called sample servo type optical information medium wherein an optical head traces over the center line of an imaginary track on the basis of information obtained from at least a pair of wobble pits disposed on both sides of the said imaginary track center line. A continuous groove is formed between the paired wobble pits along the imaginary track center line in a certain area of the optical information medium so that the deviation of each wobble pit from the imaginary track center line can be easily grasped and the conditions of the wobble pits being formed can be estimated. The quality of the medium being manufactured can be easily judged by the presence of such continuous groove.

REFERENCES:
patent: 4748609 (1988-05-01), Yonezawa et al.
patent: 4779253 (1988-10-01), Getreuer et al.
patent: 4807210 (1989-02-01), Kaku et al.

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