Optical disk device

Abstract

An optical disk provided with a land region and a groove region that are formed on a substrate, the 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 that is formed at the boundary part of neighboring land region and groove region and is disposed every other boundary part, the pre-pit region including specific information. Characteristically, the specific information's in neighboring pre-pit regions are not aligned in the radius direction of the optical disk.

What is claimed is:  
     
         1 . 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 track region detection means for detecting whether a recording track scanned by light beam is a land region or a groove region;    means for detecting a push-pull signal as a track difference signal based on the output of said track region detection means;    a calculation means for calculating said track difference signal by setting a subtraction ratio between one signal output and other signal output of said two signal outputs used to calculate said track difference signal; and    means for detecting address information from the output of said calculation means.    
     
     
         2 . 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: 
 means for outputting envelope signal or peak hold signal from track add signal to be input;    means for binarizing said envelope signal or peak hold signal to be input;    a burst detection means for detecting burst signal with a specific mark included in the pre-pit region then outputting burst detection signal; and    a logical operation means for outputting binarized signal nearly enclosing the pre-pit region based on the output signal of said binarizing means and said burst detection signal.    
     
     
         3 . 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: 
 means for generating replica signal under a condition that a crosstalk component from the neighboring pre-pit region at a position where address information is played back is clearly detected; and    a crosstalk removing means for removing said replica signal as crosstalk component from a signal component played back.