Optical recording medium

Details Optical recording medium Optical recording medium

1998-10-20

2000-10-03

Neyzari, Ali

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

G11B 724

Patent

active

061282715

ABSTRACT:
An optical recording medium comprises a substrate layer formed with a plurality of grooves having a pitch of 0.7-0.9 .mu.m, further with a plurality of prepits located between the grooves and separated from each other at a predetermined interval; a recording layer formed on the substrate layer. The optical recording medium is adapted for recording and reproducing information by directing a laser beam (having a wavelength of 600-700 nm) through an objective lens (having an numerical aperture of 0.55-0.70), further through the substrate layer so as to converge the beam on the recording layer. In particular, the plurality of grooves are different from the plurality of prepits in depth and/or width.

REFERENCES:
patent: 5481530 (1996-01-01), Ueda et al.
patent: 6021109 (2000-02-01), Spruit

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