Optical recording medium, optical recording device and optical recording method

摘要

A laser beam is directed to an optical recording medium such as a DVD-R to successively form thereon marks of a length corresponding to data with a spacing disposed therebetween. A Q value or the amount of reduction in time causes the rise time of laser irradiation to be delayed with respect to the scheduled rise time at least after a spacing equal in length to the mark of the shortest length employed for recording. The Q value satisfies the following equation (1) expressed in terms of the relationship between the recording speed n and an asymmetry. That is,
(0.54×Asymmetry-1.1)/n‰¦Q‰¦(0.54×Asymmetry-0.1)/n··· (1) where the asymmetry is the ratio of an amplitude of the shortest mark to that of the longest mark of the recorded marks.