Optical disk with identification phase-encoded area

Details Optical disk with identification phase-encoded area Optical disk with identification phase-encoded area

1990-10-25

1993-06-15

Nguyen, Hoa T.

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

3692753, 3692754, 369109, G11B 7013, G11B 724

Patent

active

052205568

ABSTRACT:
An optical disk having a recording area and an identification phase-encoded part (PEP) area with pits from which system data on the optical disk is reproduced without tracking, in which when the track pitch for the PEP area and the track pitch for the recording area are the same, the relationship between the track pitch P in the PEP area and the width W of the pits measured at a height in the pits of half the pit depth D is set in the range of 0.4P.ltoreq.W.ltoreq.0.6P; and when the track pitch for the PEP area and the track pitch for the recording area are different, the relationship between the track pitch P in the PEP area and the width W of the pits measured at a height in the pit of half the pit depth D is set in the range of P.ltoreq.2.5W.

REFERENCES:
patent: 4230915 (1980-10-01), Dil et al.
patent: 4325135 (1982-04-01), Dil et al.
patent: 4586173 (1986-04-01), Ando
patent: 4759006 (1988-07-01), Koishi et al.
patent: 4868808 (1989-09-01), Tinet
patent: 4893298 (1990-01-01), Pasman et al.

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