| 摘要 |
An optical disc reproduction device (10) comprises an optical pickup (11) for reading a digital data recorded in an optical disc, an amplitude detection circuit (18) for detecting an amplitude of wobble component signal having passed through a band pass filter (14), and a tilt detection, object value setting and drive signal generation circuit (23) for performing a detection of a tilt amount. The optical disc reproduction device (10) irradiates a laser light to the optical disc, whose one side wall in its recording area is being wobbled at a predetermined cycle, by the optical pickup (11), detects the amplitude of each wobble component signal based on a return light in case where the laser light is positioned in inner and outer periphery sides of the optical disc than the wobbled portion by the amplitude detection circuit (18), and finds a difference value of the amplitude of each wobble component signal as a tilt indication value by the tilt detection, object value setting and drive signal generation circuit (23).
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