Optical disk having an evaluation pattern for evaluating the optical disk

CAFC
  • US 5,892,751 A
  • Filed: 04/10/1997
  • Issued: 04/06/1999
  • Est. Priority Date: 04/14/1995
  • Status: Expired due to Term
First Claim
Patent Images

1. An optical disk comprising:

  • a lead-in area defined in an inner peripheral region of the optical disk;

    a lead-out area defined in an outer peripheral region of the optical disk, anda data area which is defined between said lead-in area and said lead-out area, and on which data is recorded as pits and lands on said optical-disk, said pits having one of a shortest pit length (3T), a longest pit length (KT) and a pit length between said shortest pit length (3T) and said longest pit length (KT), where T is a channel pit length, 8<

    m<

    n<

    k and m, n and k are integers, said lands having one of a shortest non-pit (*3T), a longest non-pit length (*KT) and a non-pit length between said shortest non-pit length (*(3T) and said longest non-pit length (*KT);

    wherein said lead-in area includes a test pattern area composed of at least one physical sector having a header in which a physical sector address is described and a data section in which a test pattern having a pattern of said pits and land is recorded, said test pattern having a repetition of predetermined arrangements of said pits and lands in succession, each arrangement comprising;

    a first pit with a pit length of one 3T, mT, and nT;

    a first land with a land length of one of 3T, mT, and nT;

    a second pit with a pit length of remaining one of 3T, mT, and nT, not used to define said length of said first pit;

    a second land with a land length of a remaining one of 3T, mT, and nT, not used to define said length of said first land;

    a third pit with a pit length of a last remaining one of 3T, mT, and nT not used to define said length of said first and said second pit; and

    a third land with a land length of a last remaining one of 3T, mT, and nT not used to define said first and said second land.

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