Optical disk which reduces cross erasure of data recorded on lan

Details Optical disk which reduces cross erasure of data recorded on lan Optical disk which reduces cross erasure of data recorded on lan

1997-09-12

1999-01-05

Swann, Tod R.

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

369107, 3692751, G11B 700

Patent

active

058569693

ABSTRACT:
An optical disk is formed with grooves and lands for optically tracking an optical signal along a disk substrate. The lands and grooves are tracking guides on the surface of the disk substrate are coated with a recording film. The recording film varies in thickness over different portions of the tracking guides on the surface of the disk. A number of relationships and critical values may be determined by defining film thickness over the top of a land defined by (a), film thickness over a groove by (b), film thickness along a sidewall of a land by (c), groove depth from the top of a land to the bottom of a groove by (d1), and vertical film depth from the top of the film over a land to the top of the film over a groove by (d2). A difference in level (d2) of the recording film is preferably between 100-800 nm and a ratio (b/a) is preferably between 0.6-1.1. Also, a ratio (c/a) is preferably between 0-0.8. The relationships and critical values increase resistance to cross-erasure and allow track pitch to be decreased to enhance high density recording.

REFERENCES:
patent: 5517486 (1996-05-01), Haneda
patent: 5645909 (1997-07-01), Kobayashi et al.
patent: 5696758 (1997-12-01), Yanagimachi et al.

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