| 摘要 |
In an optical information reproducing method for reproducing information from an optical information recording medium of land/groove and low-to-high recording system having a substrate (1) and a recording layer (2), light having a wavelength of 390 to 440 nm is projected to the recording layer (2) through the substrate (1) with use of an objective lens having a numerical aperture of 0.65 to thereby reproduce the information, wherein assuming that a wavelength of the light is lambda and an index of refraction of the substrate (1) in the wavelength lambda is ns, a depth D of a portion (G') of the recording layer (2) corresponding to the groove (G) with respect to a portion (L') of the recording layer (2) corresponding to the land (L) satisfies a relation of lambda/5.8 ns<=D<=lambda/5 ns.
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