| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical recording medium with which the recording of a larger capacity is possible. SOLUTION: This optical recording medium is constituted by forming a base 10 which consists of a thermoplastic resin and has a thickness of 0.3 to 1.2 mm, guide grooves 11 on this base 10, an information recording layer 15 which consists of at least a reflection film 13 and an org. dyestuff recording layer 14 successively on these guide groves 11 and a light transparent layer 12 of a thickness 10 to 177 μm. This optical recording medium is so formed that the relation of Δt<=5.26(λ/N.A.<4> ) (μm), (N.A. is a numerical aperture) is satisfied between the N.A. of an optical system for reproducing or recording and reproducing and a wavelength λwhen the unevenness of the light transparent layer thickness is defined as Δt. |
