Patent ID: 7274643

Claim:
An information recording and reproducing apparatus which irradiates an information recording medium with oscillated laser light to form a recorded region in a recording area on the information recording medium, said recorded region being physically different from the region where information has not been recorded, so that information can be recorded onto the information recording medium and reproduced or erased therefrom, said apparatus comprising: a detecting circuit configured to detect amplitude information from a reproduced signal formed by the oscillated laser light; a converting circuit configured to convert the detected amplitude information to a digital signal; and a calculating circuit configured to calculate on the digital signal such that a recording condition of the oscillated laser light is adapted; wherein the recording condition is previously recorded on the recording medium, the recording condition including a linear recording velocity of the oscillated laser light, a recording power of the oscillated laser light, amplitude information of the reproduced signal, an asymmetry of the recording power, a change ratio of the amplitude information to the recording power of the oscillated laser light, and a change ratio of the amplitude information to the linear recording velocity, and wherein the recording power for information recording and reproducing is adapted by using the recording condition recorded on the recording medium as amplitude information of the reproduced signal and the change ratio of the amplitude information to the recording power.