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,
where the asymmetry is the ratio of an amplitude of the shortest mark to that
of the longest mark of the recorded marks.
