PHASE TRANSITION TYPE OPTICAL INFORMATION RECORDING MEDIUM AND REPRODUCING METHOD THEREOF,申请号JP19970299813-传众专利搜索

PHASE TRANSITION TYPE OPTICAL INFORMATION RECORDING MEDIUM AND REPRODUCING METHOD THEREOF

申请公布号：JPH11134672(A)

申请号：JP19970299813

申请日期：1997.10.31

申请公布日期：1999.05.21

申请人：

RICOH CO LTD

发明人：SHINOZUKA MICHIAKI

分类号：G11B7/24;G11B7/09

主分类号：G11B7/24

摘要：PROBLEM TO BE SOLVED: To enable tracking and reproduction even it is a reproducing device by using a phase difference detecting method for a reproduction only optical information recording medium such as DVD-ROM. SOLUTION: In reproducing a phase transition type optical information recording medium having a recording layer in which a spiral groove is formed on a transparent substrate, by making the medium a focusing offset so that the amplitude of a push-pull signal before/after recording and the amplitude of a phase difference signal after recording become 70%-95% of the maximum values, respectively, tracking of the phase transition type optical information recording medium by a phase difference detecting method and reproduction of even a reproduction only reproducing device by the phase difference detecting method, while having a small error, are performed.