Patent ID: 7471605

Claim:
An optical disk device comprising: an energy beam generator, a power adjusting unit by which emission power of an energy beam generated by said energy beam generator can be set to have at least two predetermined power levels, a holding mechanism for holding an optical disk having a recording film capable of being changed to an optically different state by irradiation with said energy beam having said predetermined power levels to thereby record information, a moving unit by which said energy beam can be relatively moved in a surface of said recording film of said optical disk, and a conversion unit for converting information to be recorded into a power level change of said energy beam, said optical disk device being provided for recording information as a recording mark length and preamble and following space length in said optically different state by irradiating said recording film with a multi-pulse chain of said energy beam having said power levels each having an emission time changed in accordance with said optical disk while operating said moving unit, wherein: said optical disk device further comprises a storage unit for storing values of settings concerning energy beam emission control; said storage unit includes at least two reference tables on which the position and width of the first pulse in said multi-pulse chain are defined on the basis of said recording mark length and said preceding space length; said power adjusting unit performs emission pulse timing control while referring to said tables; each of said reference tables holds values of coefficients expressed as integers in a definitional equation for defining the position or width of each pulse; the position and/or width of each pulse are particularly expressed as the sum of a linear term and a nonlinear term with respect to twofold increase in recording velocity; and the coefficient of said linear term is held or the difference of the coefficient of said linear term from a predetermined value is held.