JP2002237101A5 - - Google Patents

Claims (7)

In an optical recording medium in which a recording layer and a reflective layer containing an organic dye are formed on a disc-shaped substrate on which guide grooves are formed, and recording / reproducing is performed with a laser beam having a wavelength of 600 to 700 nm , Preformat information is formed as land prepits on a land whose width is 1.3 to 1.7 times the groove width , and the maximum length in the direction parallel to the guide groove at the bottom of the land prepit is An optical recording medium having a thickness of 0.20 to 0.31 μm.   The optical recording medium according to claim 1, wherein the guide groove has a groove width of 0.28 to 0.31 μm as measured by optical groove shape measurement.   3. The optical recording medium according to claim 1, wherein the land pre-pits are substantially circular within a land width of the substrate. The groove depth of the recording layer in an unrecorded state is 60 to 75% of the groove depth of the substrate at the same position, and the film thickness of the recording layer is 10 to 50 nm at the land portion and 80 to 105 nm at the groove portion. wherein the optical recording medium according to any one of claims 1 to 3. The optical recording according to any one of claims 1 to 4 , wherein the inclination angle of the wall surface of the groove of the recording layer is 10 to 40 °, as viewed in a scanning electron microscope (SEM) image at the same magnification in the vertical and horizontal directions. Medium. Recording layer surface of the optical recording medium, the surface deflection, characterized in that the acceleration is within ± 5 m / s ^2, an optical recording medium according to any one of claims 1 to 5. In an optical recording medium in which a recording layer containing an organic dye and a reflective layer are formed on a disk-shaped substrate, the surface acceleration of the recording layer surface of the optical recording medium is within ± 5 m / s ^2. An optical recording medium.