Patent ID: 6643234
Filing Date: 2003-11-04
Classification: G11B

Abstract:
An optical disk device for conducting the recording/playback of an optical disk comprising a land region and a groove region that are formed on a substrate, said land region and groove region being used as a recording track that is the medium of the recording/playback of information signal, and a pre-pit region including address information, comprising:a header region detection means for outputting header region signal to indicate the position of a header region including the pre-pit region from a track add signal; means for outputting first-order differential signal from a push-pull signal as a track difference signal; means for outputting differential cross signal from the zero cross signal of said first-order differential signal; a window comparator means for binarizing the amplitude of said first-order differential signal at a predetermined slice level; and a logical operation means for outputting track region detection signal to determine whether a track scanned by light beam is a land region or a groove region, from said header region signal, differential cross signal and output signal of said window comparator means.