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Copy-protected optical media and method of manufacture thereof

  • US 6,589,626 B2
  • Filed: 03/29/2001
  • Issued: 07/08/2003
  • Est. Priority Date: 06/30/2000
  • Status: Expired due to Fees
First Claim
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1. An optical medium comprising:

  • a first substrate layer having a first major surface and a second major surface, said first major surface of said first substrate layer having light-changeable material thereon;

    a second substrate layer having a first major surface and a second major surface, said first major surface of said second substrate layer having information pits thereon, and said second major surface being disposed along said first major surface of said first substrate layer;

    a metal reflector layer, said metal reflector layer being disposed along said first major surface of said second substrate layer;

    a first overcoat layer being disposed along said metal reflector layer; and

    optionally a second overcoat layer being disposed along said second major surface of said first substrate layer;

    wherein said light-changeable material is a material capable of existing in at least a first optical state and a second optical state, the first optical state being convertible to the second optical state upon exposure to an input signal, and the second optical state being spontaneously convertible after a period of time to the first optical state.

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