Optical memory medium with preformed pit arrangement

Details Optical memory medium with preformed pit arrangement Optical memory medium with preformed pit arrangement

1994-09-13

1995-12-19

Nguyen, Hoa T.

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

3692754, 3692753, 369109, G11B 724

Patent

active

054775248

ABSTRACT:
In an optical memory medium comprising prepits on which a light spot is impinged to obtain information and, if required, guide grooves: each of those among the prepits which are longer than the diameter of the light spot consists of a series of pit portions and unpitted portions; each of the prepits is sandwiched between two of the discontinuous portions of guide grooves adjacent to each other; the guide grooves have one or more narrow portions, and each of the prepits is sandwiched between two of the narrow portions of guide grooves adjacent to each other; or the guide grooves have one or more long portions, one or more short portions, and narrow portions formed between the long and short portions, and each of the prepits is sandwiched between two of the short portions of guide grooves adjacent to each other.

REFERENCES:
patent: 4443870 (1984-04-01), Hazel et al.
patent: 4646103 (1987-02-01), Sugiyama et al.
patent: 4761775 (1988-08-01), Murakami
patent: 4910725 (1990-03-01), Drexler et al.
patent: 4947384 (1990-08-01), Suzukie et al.
patent: 4949331 (1990-08-01), Maeda et al.
English translation of the DE/250430, attached.
"Developments in optical disk mastering" by Jan H. T. Pasman et al, SPIE vol. 529 Optical Mass Data Storage (1985) pp. 62-68.

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