Optical information recording apparatus
Magneto-optical means for reading disks by comparing signals at leading and trailing edges of laser beam Patent #: 5105399
ApplicationNo. 851537 filed on 03/13/1992
US Classes:369/59.2, Binary signal phase processing369/13.05Reading
ExaminersPrimary: Berman, Jack I.
Attorney, Agent or Firm
Foreign Patent References
International ClassG11B 007/00
Foreign Application Priority Data1991-03-20 JP
AbstractA read out apparatus reads out prerecorded information from a magneto-optic disk by detecting intervals of edges of magnetic domains formed on the magneto-optic disk with different directions of magnetization, where the intervals of the edges of the magnetic domains correspond to data "1"s or "0""1"s of the prerecorded information. The read out apparatus includes a first part for producing a read out signal by scanning the magnetic domains of the magneto-optic disk, a second part for producing an edge detection signal which has rising and falling edges depending on leading and trailing edges of the magnetic domains, and for corecting edge positions of the edge detection signal based on predetermined information, a third part including a phase locked loop circuit for producing a clock signal which is synchronized to the rising and falling edges of the edge detection signal, and a fourth part for separating the data from the edge detection signal output from the second part using the clock signal output from the third part.