Patent ID: 8228780
Filing Date: 2012-07-24
Classification: G11B

Abstract:
1. An optical disk device which reflects a laser beam emitted from a laser beam source off an optical disk, detects the reflected light as an electric signal with a photodetector, the optical disk device comprising: an analog signal processor for generating a servo signal and a reproduction signal from the detected electric signal; a digital signal processor for sampling the generated servo signal and reproduction signal; a laser driver for superimposing a high frequency current on a direct current to obtain a drive current and supplying the drive current to the laser beam source, and driving the laser beam source; and a control unit for obtaining the servo signal and reproduction signal sampled by the digital signal processor and setting a current value of the direct current and/or the high frequency superimposed current supplied by the laser driver to the laser beam source, wherein the control unit is configured to: obtain a relation of a value representing a waveform fluctuation of the servo signal or the reproduction signal and the current value of the direct current and/or the high frequency superimposed current, a relation of a value representing a reproduction performance of the reproduction signal and the current value of the direct current and/or the high frequency superimposed current, and a relation of a value representing a durability performance of the optical disk in relation to the laser beam and the current value of the direct current and/or the high frequency superimposed current; and determine the current value of the direct current and/or the high frequency superimposed current so that the current value of the direct current and/or the high frequency superimposed current satisfies specified values of the waveform fluctuation, the reproduction performance, and the durability performance.