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Optical disc and optical disc device

  • US 10,381,037 B2
  • Filed: 05/18/2018
  • Issued: 08/13/2019
  • Est. Priority Date: 02/16/2005
  • Status: Active Grant
First Claim
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1. A manufacturing method for manufacturing an optical disc, containing a first recording layer, having a track upon which a first laser beam having a first wavelength is focused to write data on the first recording layer, and a management area on said first recording layer, said manufacturing method comprising:

  • recording first information representing if a second recording layer is present in said optical disc on a first position of said management area by using the first laser beam, andrecording second information representing if a third recording layer is present in said optical disc on a second position of said management area by using the first laser beam;

    wherein data on the second recording layer is written by using a second laser beam,wherein a second wavelength of the second laser beam which is focused to write data on the second recording layer, is longer than the first wavelength,wherein data on the third recording layer is written by using a third laser beam,wherein a third wavelength of the third laser beam which is focused to write data on the third recording layer is longer than the second wavelength,wherein said first information and said second information comprise two bits respectively,wherein said first information indicating said second recording layer represents absence of said second recording layer by bit values of 00 in the first position,wherein said second information indicating said third recording layer represents absence of said third recording layer by bit values of 00 in the second position.

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