Patent ID: 7466638

Claim:
A recording power adjustment method for recording information on an optical disk comprising the steps of: selecting at least three testing center recording powers P f (j: j>3) according to disk information written on the optical disk in advance; recording a signal in a recording test region of the optical disk, with a recording power being shifted according to a testing recording power row P j (i) defined around each of the testing center recording powers P f (j); reproducing the signal recorded in the recording test region and detecting a reproduced signal amplitude row m j (i) corresponding to the recording power row P j (i), for each of the testing center recording powers; linearly approximating a relationship between the recording power row P j (i) and a row of multiplication products of corresponding values of the reproduced signal amplitude row m j (i) and the recording power row P j (i) and computationally determining a recording threshold power P thr (j) as an intersection of the linear approximation straight line and the recording power axis, for each of the testing center recording powers; computationallv determining a tentative reference recording power P t (j) as a multiplication product of the recording threshold power P thr (j) and a first factor K contained in the disk information, for each of the testing center recording powers; computationally determining a definitive reference recording power P t ′ as an intersection of a straight line or curve connecting two points of (P f (j), P t (j)) and a straight line representing P t =P f in a graph in which the computationally determined at least three tentative reference recording powers P t (j) are plotted relative to the corresponding at least three testing center recording powers P f (j), the two points being selected such that the two points are located at the opposite sides of the straight line representing P t =P f ; and computationally determining an optimum recording power P wopt to be used for recording on the optical disk by multiplying the definitive reference recording power P t ′ by a second factor ρ contained in the disk information; wherein, when the recording threshold power P thr (j) is greater than the smallest value of the corresponding recording power row P j (i), P t (j) corresponding to the recording power row P j (i) is excluded.