Method for the manufacture of an optically readable disc, and discs

Abstract

A method for the manufacture of an optically readable disc, notably for providing and fixing the recording of a coded information in a sensitive resin layer applied on a transparent substrate made of an inorganic material, such as notably glass, the resin layer being preferably coated outside by a thin protective layer. According to the invention, this method is characterized in that it consists in recording in a manner known per se the signal corresponding to the coded information by localized activation of the sensitive layer through the substrate, then to remove the protective layer, to perform the engraving of the substrate through the activated zones of the sensitive layer playing the role of an engraving mask, to remove the remaining of this sensitive layer, to coat the engraved substrate with a thin reflecting metallic layer and finally to deposit on the metallic layer a final protective external layer. The invention relates also to the disc obtained by the method.