Patent ID: 8054720
Filing Date: 2011-11-08
Classification: G11B

Abstract:
1. An optical disk apparatus comprising: an emission section for outputting a light beam to be radiated on an information medium; a current adjustment section for detecting a light amount of the light beam and adjusting a current to be supplied to the emission section; a recording clock generation section for generating a recording clock signal to serve as a reference at data recording; a frequency division section for dividing the recording clock signal to generate a divided clock signal; a recording pattern calculation section for setting a data recording emission pattern based on the recording clock signal, the data recording emission pattern being for recording data; a test pattern calculation section for setting a test emission pattern for test recording based on the divided clock signal, the test emission pattern being for controlling a power of the light beam which is output from the emission section; and a current output section for supplying a current to the emission section based on an emission pattern which is selected from between the data recording emission pattern and the test emission pattern and on a current value which is calculated by the current adjustment section, wherein, when a linear velocity at recording changes, the frequency division section adjusts a division ratio in a direction of reducing a change in frequency of the divided clock signal.