Optical disk

Details Optical disk Optical disk

2008-07-15

2008-07-15

Neyzari, Ali (Department: 2627)

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

C369S277000, C428S064400

Reexamination Certificate

active

07400570

ABSTRACT:
An optical disk according to the present invention has a guide groove formed with a width which is not less than 80 nm and not more than 170 nm in terms of a half-value width. A depth of the guide groove is formed within a range in which (n1−n2)·d1+n2·d2=(2m−1)·λ/4 is ±15%, wherein n1is a refractive index of a substrate, n2is a refractive index of a recording film, λ is a wavelength of light beams used for recording and reproduction of information, d1is a depth of the guide groove, d2is a depth of the recording film positioned on the guide groove, and m is an integer (m=1, 2, 3, 4 . . . ).

REFERENCES:
patent: 6728198 (2004-04-01), Fujii et al.
patent: 6874156 (2005-03-01), Takagishi et al.
patent: 2002/0127367 (2002-09-01), Shibata
patent: 2003/0003261 (2003-01-01), Saito et al.
patent: 2003/0064192 (2003-04-01), Berneth et al.
patent: 2004/0058274 (2004-03-01), Fukuzawa et al.
patent: 2003-203391 (2003-07-01), None
patent: 2003203391 (2003-07-01), None
Machine translation ofJP 2003203391 A.

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