OPTICAL DISC DEVICE AND INFORMATION RECORDING/REPRODUCTION METHOD

摘要

An optical disc device includes: a light source; an objective lens for focusing the light emitted from the light source toward the optical disc; a first photo-detector for detecting reflected light from the optical disc and outputting a first signal; a signal processing section for receiving the first signal and generating a signal containing information recorded on the optical disc; a second photo-detector for detecting a part of the light emitted from the light source and outputting a second signal; a light source drive section for receiving the second signal and driving the light source according to the second signal so that the emission power of the light source coincides with a target value; and an amplitude fluctuation detection section for detecting an amplitude fluctuation amount of the second signal and changing the drive characteristic of the light source drive section if the amplitude fluctuation amount exceeds a predetermined value.