| 摘要 |
An optical power level-controlling device (10) controls optical power level, such as a first reference level, a higher second level and a higher third level, of a laser beam irradiated on an optical disk. A table is created which contains second level indication data (difference between the second and first levels) for each of the second levels varied in a stepped manner and third level indication data (difference between the third and second levels) for each of ratios of the second level indication data to the third level indication data, the ratio being varied in a stepped manner. Optimum second level and optimum ratio for an optical disk are determined based on product information read from the optical disk. A second level and a ratio to be used for controlling an optical power level are retrieved from the table using the optimum second level and the optimum ratio. <IMAGE> |
