Dynamic information storage or retrieval – Systems having plural physically distinct independent tracks... – Having layered storage medium
Reexamination Certificate
2007-11-15
2011-10-04
Haley, Joseph (Department: 2627)
Dynamic information storage or retrieval
Systems having plural physically distinct independent tracks...
Having layered storage medium
C369S112230, C369S284000
Reexamination Certificate
active
08031574
ABSTRACT:
An optical disk compliant with both a conventional optical disk such as a BD, HD DVD, and the like and a next-generation high-density optical disk according to a near-field light recording system and the like is provided.An information recording medium includes a first information recording layer and a second information recording layer, to/from which information is recorded or reproduced using laser beam. The first information recording layer is formed at a laser beam entrance surface, and is configured so that information can be recorded thereupon and/or reproduced therefrom using a first objective lens having a first numerical aperture NA1and laser beam of a first wavelength λ1. The second information recording layer is formed so as to have a distance to the laser beam entrance surface is 0.05 mm to 1.2 mm and is configured so that information can be recorded thereupon and/or reproduced therefrom using a second objective lens having a second numerical aperture NA2and laser beam of a second wavelength λ2. When a diffraction limit δ2, determined by the numerical aperture NA2and the second wavelength λ2, is taken as δ2=0.61×λ2/NA2, a track pitch Tp1of a track formed on the first information recording layer is Tp1<δ2.
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Komma Yoshiaki
Tanaka Toshiyasu
Wakabayashi Kanji
Yamasaki Fumitomo
Haley Joseph
Panasonic Corporation
Wenderoth , Lind & Ponack, L.L.P.
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