| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an optical disk device permitting smooth and proper power setting also by shifting an outgoing wavelength, and to provide the structure of a recording medium necessary therefor. <P>SOLUTION: A wavelength compensation table in which laser wavelengths are correlated with compensation coefficients is recorded on a disk with wobbles, pits and the like. A controller 111 reads out the wavelength compensation table from the disk and holds it in a built-in memory at the time of disk loading. The controller determines a wavelength λ1 of an outgoing laser beam based on temperature information supplied from a temperature sensor 112 at the time of OPC (Optimum Power Control), and obtains the compensation coefficients α1, α0 corresponding to the wavelength λ1 and a reference wavelength λ0, respectively, from the wavelength compensation table. Then, the controller calculates Pw1 = Pw0 x (α1/α0) from primary power Pw0 and the compensation coefficients α1, α0, and primary power Pw1 at the time of OPC is set. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
