High-density dual-layer optical disc

High-density dual-layer optical disc

  • CN 1,550,011 A
  • Filed: 06/04/2003
  • Published: 11/24/2004
  • Est. Priority Date: 06/05/2002
  • Status: Active Application
First Claim
Patent Images

1. hd dual-layered optical disc, it comprises that first recording layer and second recording layer, these layers are positioned in a side of the central plane of dividing disc thickness equally and near light incident surface, wherein:

  • Refractive index in light-transmissive substrates is under the state of n, respectivelyFirst substrate thickness from the light incident surface of light-transmissive substrates to first recording layer has the value greater than minimum 70 μ

    m;

    AndSecond substrate thickness from the light incident surface of light-transmissive substrates to second recording layer has the value less than maximum 108 μ

    m.

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