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Incorporation of markings in optical media

  • US 7,393,623 B2
  • Filed: 11/05/2003
  • Issued: 07/01/2008
  • Est. Priority Date: 06/06/2001
  • Status: Expired due to Fees
First Claim
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1. A method for producing an optical disc, comprising:

  • selecting a formulation comprising a photocurable base material cured by exposure to ultraviolet (UV) light corresponding to a first set of wavelengths, at least one set of photoacid generators (PAGS) responsive to ultraviolet (UV) marking light corresponding to a second set of wavelengths substantially distinct from the first set of wavelengths, and a material that changes that changes its light absorption characteristics in response to a change of pH to form at least one marking is adapted for forming at least one marking upon exposure to a source of marking light, wherein the marking light is ultraviolet light corresponding to the second set of wavelengths, wherein the first layer is comprised of hexanediol diacrylate;

    triphenylsulfonium triflate and a color former;

    applying the formulation in at least a portion of a first layer of the optical media;

    curing the first layer;

    forming the at least one marking by exposure to marking light having wavelengths in the second set of wavelengths;

    wherein the marking, when formed, appears in at least a readout area of the optical media and is substantially non-interfering with a readout light for the optical media, wherein said formulation is sensitive to only ultraviolet (UV) light, wherein the optical media is capable of storing data;

    applying a second layer onto the first layer, wherein the second layer is comprised of a crosslinkable silicone polyether acrylate;

    tris (2-hydroxy ethyl) isocyanurate triacrylate; and

    a difunctional bisphenol A based epoxy acrylate; and

    curing the second layer.

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