An optical recording medium comprising:na recording layer on which a groove and a land are formed, wherein the groove is concave and the land is convex when seen from a side of a laser light incident surface, wherein both the groove and the land are recording tracks where recording or reproduction of information is performed by irradiation of laser light whose wavelength is 400 nm to 415 nm by an optical system whose numerical aperture (NA) is 0.85±0.1,wherein a pitch between the groove and the land that are adjacent recording tracks is within a range of 250 nm to 200 nm, such that a symbol error rate of the recording layer does not exceed 4.3×10−3 during the reproduction.
›2.↳ 1The optical recording medium according to claim 1, wherein a depth of the groove with respect to the land is within a range of 30 nm to 5 nm when seen…d2
The optical recording medium according to claim 1, wherein a depth of the groove with respect to the land is within a range of 30 nm to 5 nm when seen from the side of the laser light incident surface.
›3.↳ 1The optical recording medium according to claim 1, wherein a duty of a cross-sectional concavo-convex pattern of the groove and the land is {(land wid…d2
The optical recording medium according to claim 1, wherein a duty of a cross-sectional concavo-convex pattern of the groove and the land is {(land width)/(pitch between grooves)}×100, and wherein the duty is within a range of 50 to 5.
›4.↳ 1The optical recording medium according to claim 1, wherein the groove is wobbled according to information.d2+1
The optical recording medium according to claim 1, wherein the groove is wobbled according to information.
›5.↳ 4The optical recording medium according to claim 4, wherein an amplitude of wobbling of the groove is 5 nm or more.d3
The optical recording medium according to claim 4, wherein an amplitude of wobbling of the groove is 5 nm or more.
›6.↳ 1The optical recording medium according to claim 1, wherein a plurality of recording layers are provided at different depth positions when seen from th…d2
The optical recording medium according to claim 1, wherein a plurality of recording layers are provided at different depth positions when seen from the side of the laser light incident surface.
›7.↳ 1The optical recording medium according to claim 1, wherein the optical recording medium is a disc-shaped optical recording medium, and the groove is f…d2
The optical recording medium according to claim 1, wherein the optical recording medium is a disc-shaped optical recording medium, and the groove is formed spirally or concentrically on the recording layer.
›8.↳ 1The optical recording medium according to claim 1, wherein the recording layers comprises a land-groove pattern adapted for a land-groove recording me…d2
The optical recording medium according to claim 1, wherein the recording layers comprises a land-groove pattern adapted for a land-groove recording method.
›9.↳ 1The optical recording medium according to claim 1, wherein a pitch between the groove and an adjacent groove on the recording layer is within a range …d2
The optical recording medium according to claim 1, wherein a pitch between the groove and an adjacent groove on the recording layer is within a range of 500 nm to 400 nm.
›10.↳ 1The optical recording medium according to claim 1, wherein a pitch between the groove and the land that are adjacent recording tracks is preferably wi…d2
The optical recording medium according to claim 1, wherein a pitch between the groove and the land that are adjacent recording tracks is preferably within a range of 225 nm to 200 nm.
›11.↳ 1The optical recording medium according to claim 1, wherein the pitch between the groove and the land that are adjacent recording tracks is preferably …d2
The optical recording medium according to claim 1, wherein the pitch between the groove and the land that are adjacent recording tracks is preferably within a range of 240 nm to 220 nm when a plurality of recording layers are provided.
›12.↳ 1The optical recording medium according to claim 1, wherein the groove is wobbled according to information such that a wobble carrier noise ratio (CN) …d2
The optical recording medium according to claim 1, wherein the groove is wobbled according to information such that a wobble carrier noise ratio (CN) with respect to a wobbling amplitude of the groove is greater than or equal to 29 dB.
›13.↳ 1The optical recording medium according to claim 1, wherein a track width of the groove is constant and a track width of the land is varied.d2
The optical recording medium according to claim 1, wherein a track width of the groove is constant and a track width of the land is varied.
›14.↳ 1The optical recording medium according to claim 1, wherein an optical recording power for the land is different from the groove.d2
The optical recording medium according to claim 1, wherein an optical recording power for the land is different from the groove.
