Patent ID: 7126896

Claim:
An information recording method of recording information on an optical disk, comprising: an information recording step of forming a plurality of pits representing recording target information on said optical disk by controlling a power of a laser light to be irradiated onto said optical disk; condition detecting step of deriving a condition index representing a recording condition of said optical disk, while the laser light is irradiated onto said optical disk in said information recording step, by using an equation which is changeable in accordance with a kind of said optical disk and an environment in which information recording is performed; and a power adjusting step of adjusting the power of the laser light to be irradiated in said information recording step, in order that said recording condition may be a predetermined recording condition, based on said condition index derived in said condition detecting step, wherein said equation includes a coefficient which is determined in accordance with the kind of said optical disk and the environment in which information recording is performed, and wherein said equation is represented by Rm=Sp/Ss/Pw1 γ (where Rm represents said condition index, Sp represents a level of a portion of a reflection light from said optical disk in case of a pit being formed, in which portion a light intensity is stable, Ss represents a level of a portion of a reflection light from said optical disk in case of a pit not being formed, in which portion a light intensity is stable, and γ represents said coefficient determined in accordance with the kind of said optical disk and the environment in which information recording is performed), said information recording method further comprises: a first detecting step of detecting the level Sp; and a second detecting step of detecting the level Ss, and said condition detecting step includes a step of deriving said condition index Rm by using the detected levels Sp and Ss, and said equation, in a case where a velocity along tracks of said optical disk is constant.