| 摘要 |
PROBLEM TO BE SOLVED: To satisfactorily perform a high-density recording including small pits with respect to the spot diameter of a laser beam. SOLUTION: When the shortest pit length and λ/NA (λ is a recording wavelength μm, NA is the numerical aperture of the objective lens of a pickup) are respectively defined as Pmin and (r), a markedge recording as such Pmin is made to enter within the range shown by 0.35r<=Pmin <=0.45r is performed with respect to an optical recording medium having a recording layer including dystuff absorbing laser beams directly or with another layer on a transparent substrate having grooves and a metallic reflection layer directly or with another layer on the recording layer. At this time, recording laser pulses corresponding to a recording part succeeding to the shortest interval are made to be delayed by xT (0.05<=x<=0.2, T is a clock interval time) and recording laser pulses corresponding to a recording part succeeding to the second shortest interval are made to be delayed by yT (0.00<=y<=0.1, T is the clock interval time). |
