Optical recording medium and method for producing same

Details Optical recording medium and method for producing same Optical recording medium and method for producing same

1997-06-20

1999-08-03

Neyzari, Ali

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

369 4426, G11B 724

Patent

active

059334096

ABSTRACT:
An optical recording medium having plural signal recording layers, in which a sufficient signal volume is secured even from the signal recording layer irradiated with the reproducing light beam from the opposite side of a transparent substrate with respect to its signal recording surface. If the recording medium has plural signal recording layers in which a reflective film is formed on a signal recording surface of the transparent substrate carrying crests and valleys, the crests and valleys are formed on each transparent substrates so that the value of asymmetry A1 of reproduced signals in the signal recording layer irradiated with the reproducing light beam from the side of the transparent substrate is substantially equal to the value of asymmetry A2 of reproduced signals in the signal recording layer irradiated with the reproducing light from the opposite side. The length and the width of the crests and valleys of the latter signal recording layer are preferably larger by a film thickness of the reflective film than the length and the width of the crests and valleys of the former signal recording layer.

REFERENCES:
patent: 4949332 (1990-08-01), Veenis et al.
patent: 5025435 (1991-06-01), Veenis et al.

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