Optical record medium and optical record method thereof
An optical recording medium, a technology for recording marks, applied in the directions of optical record carriers, optical recording/reproducing/erasing methods, optical recording heads, etc., can solve problems such as difficulty in multi-level recording
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[0038] First, the principle of this embodiment will be described.
[0039] figure 1 In , the recording marks formed when a virtual recording unit is irradiated with a laser beam at a certain power for a maximum irradiation time T (the maximum time that can be occupied by recording of each virtual recording unit: this is called the allowable irradiation time) are shown. The reduced state of light reflectance of the virtual recording unit (solid line O) versus time.
[0040] As shown by the solid line O, when the laser beam is irradiated with a constant power, the light reflectance in the initial time zone A hardly decreases. Whereas, in the middle region B, the light reflectance tends to decrease, and the rate of decrease also increases with time. In the end region C, its decreasing speed tends to decrease slowly.
[0041] When the irradiation time is set in multiple steps and the laser beam is irradiated on the dummy recording unit to form recording marks (low light reflect...
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