Patent ID: 6728183
Filing Date: 2004-04-27
Classification: G11B

Abstract:
A optical disk device for recording signals on an optical disk which constitute a signal recording medium by focusing laser light on a face of the optical disk comprising:an averaged light quantity calculating portion for calculating an averaged light quantity of the laser light by splitting the laser light focussed upon the face of the optical disk and by detecting its low frequency component; a memory portion for outputting the averaged light quantity in a reproducing mode of operation and for memorizing and outputting the averaged light quantity which has been calculated for a first period of time (t1) after a beginning of recording in a recording mode of operation; an error quantity calculating portion for calculating a difference between output signals from the averaged light quantity calculating portion and the memory portion; and a laser light power control portion for controlling a power of the laser light in response to an output signal from the error quantity calculating portion.