Optical information recording medium
AssigneeTaiyo Yuden Co., Ltd.
InventorsYoshikazu Takagishi, Atsuo Shimizu, Ryuichi Sunagawa, Keiichi Ida, Mitsuo Sekiguchi, Isao Matsuda
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Abstract
An optical information recording medium recordable at a high density two times or more higher than that of currently-used CD-Rs by devising the shape of a pregroove is provided. It is provided with a recording layer formed on a transparent substrate having a spiral pregroove formed thereon, wherein a track pitch Tp of the pregroove is 1.0 μm≦Tp≦1.2 μm and an inclination angle Ga of sidewalls of the pregroove is 30°≦Ga≦70°.
Claims6
An optical information recording medium having a recording layer formed on a transparent substrate having a spiral pregroove formed thereon, wherein:
- a track pitch Tp of the pregroove is 1.0 μm≦Tp≦1.2 μm;
- and
- an inclination angle Ga of sidewalls of the pregroove is 30°≦Ga ≦70°.
An optical information recording medium having a recording layer formed on a transparent substrate having a spiral pregroove formed thereon, wherein a track pitch Tp of the pregroove is 1.0 μm≦Tp≦1.2 μm, an inclination angle Ga of sidewalls of the pregroove is 30°≦Ga≦70°, a half-width Gw of the pregroove is 0.25 μm≦Gw≦0.50 μm, a depth Gd of the pregroove is 100 nm≦Gd≦300 nm, a width Lw of a land formed between the pregrooves is Lw≧0.6 μm, and a wobbling amplitude Wamp of the pregroove is 20 nm≦Wamp≦45 nm.
Dependencies are inferred from the claim text.