High density optical disc configuration

Details High density optical disc configuration High density optical disc configuration

1997-05-19

1999-03-16

Neyzari, Ali

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

3692753, G11B 724

Patent

active

058838791

ABSTRACT:
An optical disc includes two transparent substrate layers each having a recording surface with a plurality of pits arranged concentrically or spirally. The plurality of pits represents information stored on the recording surface. Each transparent substrate layer has a thickness of 0.6.+-.0.03 mm. A reflecting layer is formed on each of the recording surfaces of the two transparent substrate layers. An inclining angle formed between a pit inner wall and a normal line of each transparent substrate layer is 20.degree.-55.degree., and pit depth is set to be .lambda./3.5N-.lambda./2.7N. .lambda. is defined as the wavelength of a laser beam incident the optical disc for reading the information recorded on the optical disc, and N is the index of refraction of each transparent substrate layer.

REFERENCES:
patent: 5689495 (1997-11-01), Tsuchiya et al.
patent: 5708651 (1998-01-01), Sugaya et al.

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