Disc recording provided with legible matter
Optical information recording medium for semiconductor laser
Information recording material
Environmentally protected optical recording media Patent #: 4652498
ApplicationNo. 380676 filed on 07/14/1989
US Classes:347/262, With record receiver or handling means therefor369/273Combined with diverse art structure
ExaminersPrimary: Reinhart, Mark J.
International ClassG01D 009/00
AbstractA read-only optical recording disc comprising a substrate, a metal reflective layer and an overlying protective layer, at least one of the substrate and the protective layer being light-transmissive, is marked by means of a pulsed scanning laser beam which transmits light in a patterned array through a transparent layer of the medium and indelibly marks the reflective layer of the medium without disrupting the surface continuity of the substrate and protective layer.