Recording medium and recording and reproducing apparatus employing the recording medium
Optical disk formatting system using index mark detecting circuit
Optical recording and reproducing apparatus for tracking wobbling guide grooves
Servo pattern in an optical data storage medium for obtaining a tracking error signal
Method and apparatus for detecting a signal Patent #: 5459706
ApplicationNo. 637545 filed on 04/25/1996
US Classes:369/44.26, Servo system operation related to disc structure information format369/44.29, Servo loop gain/switching control369/44.34, Sampling servo system369/275.4Pit/bubble/groove structure specifies
ExaminersPrimary: Tran, Thang V.
Attorney, Agent or Firm
Foreign Patent References
International ClassG11B 007/095
Foreign Application Priority Data1995-05-30 JP
AbstractAn optical disk is provided with grooves, which have first and second regions. A first side wall of a groove in the first region is wabbled, while a second side wall of the groove, which is opposite to the wabbled side wall in the first region, is wabbled in the second region. The tracking of a light beam is carried out with respect to the first and second regions, so that first amplitude of a first wabble signal and second amplitude of a second wabble signal, which are contained in a tracking error signal, are obtained. The first and second amplitude are compared, and a correction signal which varies depending on the difference in the amplitude is given to the tracking error signal, so that the first and the second amplitude are corrected to be substantially equal. Thus, it is possible to correct a deviation caused by an error in conditioning optical elements, an aberration of optical elements, and a change due to aging.