OPTICAL RECORDING MEDIUM, OPTICAL RECORDING METHOD AND OPTICAL REPRODUCTION METHOD

PROBLEM TO BE SOLVED: To provide an optical recording medium which is reduced in the inside and outside difference of a signal level while keeping high modulation degree or the like and is excellent in productivity, an optical recording method, and an optical reproducing method. SOLUTION: The optical recording medium comprises a substrate having in-grooves 1b and on-grooves 1a formed on at least one surface of a substrate 1 and further, a recording layer 3 and a cover layer 4 are formed in order. The recording layer 3 is formed planar and the thickness thereof is approximately uniform, and the on-grooves 1a are optical recording portions. Also, the recording method comprises condensing a laser beam of a wavelength below 450 nm through an objective lens of ≥0.7 in numerical aperture from a cover layer side of the optical recording medium, irradiating the optical recording portions with the laser beam, and detecting the reflected light thereof to reproduce the information information recorded therein. COPYRIGHT: (C)2007,JPO&INPIT