Patent ID: 7848201

Claim:
An information recording apparatus that performs recording on an optical disk medium having a recording layer on which mark information is recorded by a laser beam emitted in accordance with a waveform based on a recording pulse sequence while varying a recording clock cycle T in accordance with a variation in a recording linear velocity such that a recording linear density becomes substantially constant, said information recording apparatus comprising: a controller that, when performing recording by using a plurality of multiple pulses defined by an erase power Pe 1 and an erase power Pe 2 as an erasing pulse for forming a space part between mark parts, calculates and updates at predetermined intervals set values of the erase power Pe 1 , the erase power Pe 2 , and a duty ratio Te 1 of a pulse width of the erase power Pe 1 that are corresponding to a recording linear velocity by performing an approximation with respect to the recording linear velocity on the set values of the erase power Pe 1 , the erase power Pe 2 , and the duty ratio Te 1 with respect to the cycle of the multiple pulses, said set values corresponding to one of address information and recording linear velocity information detected from the optical disk medium; an erasing pulse generation part that varies a position of an edge of the erasing pulse for the multiple pulses in accordance with the updated duty ratio Te 1 and generates the multiple pulses defined by the erase power Pe 1 and the erase power Pe 2 ; and a driver circuit that updates and controls an amount of light emitted from a laser light source in accordance with the updated erase power Pe 1 and the updated erase power Pe 2 .