G - Physics – 11 – B
Patent
G - Physics
11
B
G11B 11/14 (2006.01) G11B 11/105 (2006.01) G11B 20/10 (2006.01) G11B 20/12 (2006.01) G11B 20/14 (2006.01)
Patent
CA 2063189
A 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"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 correcting 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.
Futamata Akio
Izumi Haruhiko
Moritsugu Masaharu
Taguchi Masakazu
Fetherstonhaugh & Co.
Fujitsu Limited
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