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Optical disc, device for checking optical disc and device for recording information on optical disc

  • US 5,696,757 A
  • Filed: 09/23/1996
  • Issued: 12/09/1997
  • Est. Priority Date: 07/29/1993
  • Status: Expired due to Term
First Claim
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1. An optical disc comprising:

  • a predetermined number of spiral trains of regular pits; and

    at least one train of irregular pits;

    the regular pits of each of the trains being arranged symmetrically with respect to a center of a track;

    each of the irregular pits having a predetermined shape different from a shape of each of the regular pits;

    an arrangement of the train of the irregular pits being different from an arrangement of each of the trains of the regular pits and being asymmetrical with respect to a center of a track;

    the train of the irregular pits having information causing a tracking error signal.

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