| 摘要 |
PURPOSE: An optical recording method and an optical recording medium are provided to suppress the increase of jitter in a phase change optical recording medium with no extreme decrease in the crystallization speed of the recording layer, when the medium is overwritten at a high linear velocity, and to accomplish the overwriting with the increase of jitter suppressed over the entire area of the medium, in a disk-shaped medium operated at a constant angular velocity. CONSTITUTION: When forming amorphous recorded marks in a recording layer, for a disk-shaped optical recording medium having the phase change recording layer which is rotated at a constant angular velocity, the minimum recorded mark is formed such that WL/ML incrementally or gradually decreases from the radially inner side to the radially outer side of the optical recording medium. The minimum signal has a length of SL, and the minimum recorded mark corresponding to the minimum signal has its maximum width of MW, and EW is 0.1 MW. The position on the leading edge side of the recorded mark at the width of EW is designated effective leading edge. The position on the trailing edge side of the recorded mark at the width of EW is designated effective trailing edge. The distance between the effective leading edge and the effective trailing edge is designated effective length ML. And the distance between the effective leading edge and the position at which the width starts to decrease on the trailing edge side is designated WL.
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