INFORMATION RECORDING AND REPRODUCING DEVICE, AND INFORMATION RECORDING METHOD

摘要

PROBLEM TO BE SOLVED: To form highly accurate recorded marks by controlling the irradiation of a light based on a reflected light quantity to be detected for an nth time (n is a natural number) and a reflected light quantity to be detected for the next time while detecting states of a recorded part from the reflected light of a light to be irradiated on an information recording medium to suppress the fluctuation of recorded marks as much as possible. SOLUTION: A reflected light level in an unrecorded or erased state is detected with a first sampling pulse by irradiating a recording medium only with an erasing power in accordance with a power correction starting signal and a level to be detected with a next sampling pulse is predicted from the relation between the irradiation power and the reflected light level. Then, a setting power is changed according to the variation rate between a measured value and a predicted value by comparing the reflected light level measured with the next sampling pulse with the preliminarily predicated predicted level. That is, even when recorded marks are present already, mark shapes being the same as that of unrecorded marks are obtained by changing the setting power by the compared result between an (n+1)th predicted value to be calculated from an nth measured value and an (n+1)th measured value.