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US 4,020,278 AGranted
Data carrier for optical read-out
AssigneeThomson-Brandt
InventorsBernard Carre, Claude Puech, Erich Spitz
Life of this patent
Estimating the term…
Abstract
The present invention relates to data carriers intended for optical read out. The data carrier in accordance with the invention comprises: a first transparent material at the surface of which the information is recorded in the form of an embossed pattern; a partially transparent metal layer covers said embossed pattern and a second, thick transparent material is deposited upon the metal layer for protection purposes.
Claims4
A data carrier for optical read-out with a predetermined radiation, said data carrier comprising:
- a substrate transparent to said radiation, an embossed pattern representative of said data provided at the surface of said substrate, a thin metal layer deposited upon said embossed pattern and a protective layer transparent to said radiation overlaying said metal layer;
- the thickness of said thin metal layer being selected for partially reflecting said radiation;
- said thin metal layer being deposited over the whole of said surface.
Dependencies are inferred from the claim text.