JP2002237100A5 - - Google Patents

Claims (2)

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 on which guide grooves are formed, the groove depth and / or the groove width of the guide grooves is determined according to the following rules. The optical recording medium is characterized by increasing from the inner periphery toward the outer periphery.
(Regulation of groove depth)
Increasing from the inner periphery toward the outer periphery means that the groove depth in the optical groove shape measurement of the guide groove of the substrate is 140 to 155 nm, and the groove depth at least at a radius of 45 mm from the center is , 5 to 9 nm deeper than that at a radius of 25 mm.
(Regulation of groove width)
Increasing from the inner circumference toward the outer circumference means that the groove width in the optical groove shape measurement is 0.28 to 0.31 μm, and the groove width at least at a radius of 45 mm from the center is 25 mm in radius. It is assumed that it is wider by 0.003 to 0.010 μm than in FIG.   The groove depth observed with an atomic force microscope of the guide groove of the substrate is 150 to 180 nm, and the groove depth at a radius of 58 mm from the center is 5 to 20 nm deeper than that at a radius of 23 mm. The optical recording medium described.