| 摘要 |
PURPOSE:To prevent the generation of fluctuation in automatic power control at the time of switching reading, writing, or erasing by allowing the average value of a modulation light emitting power at the time of reading to coincide with base reading power to be base light emitting power for writing or erasing. CONSTITUTION:At the time of turning on a power supply for this optical recording/reproducing device, an automatic adjustment control part 200 is driven and the set signals V1 to V5 of voltage/current converters 12-1 to 12-3, 12-5 are adjusted so that prescribed light emitting power can be obtained. The set signals V2, V3 of respective D/A converters 24-2, 24-3 are adjusted at the time of this automatic adjustment so that the average value of reading modulation power based upon a modulation current for reading coincides with base reading power based upon a reading base current IR for applying a base level for writing. Thereby, the generation of fluctuation in automatic power control at the time of switching reading, writing, or erasing can be prevented and the stability and responsiveness of the device can be improved. |
