Patent ID: 7909957

Claim:
Process for producing a recording medium comprising at least a first and a second micro-structured stage assembled by an adhesive layer and arranged between micro-structured bottom and top substrates, the process comprising: deposition on the first stage of a polymerizable layer forming the adhesive layer, provisional placing on the adhesive layer of a single micro-structured matrix, the single micro-structured matrix being transparent to a light designed to perform polymerization of the adhesive layer, so as to micro-structure the adhesive layer, polymerization of the adhesive by exposure, through the single micro-structured matrix, with a polymerization light, removal of the single micro-structured matrix, deposition of the second stage on the micro-structured adhesive layer, deposition of an additional adhesive layer on the second stage, and final placing of the single micro-structured matrix on the additional adhesive layer so as to form the top substrate, wherein the process further comprises: a surface treatment of the single micro-structured matrix enabling at least a part of a surface of the single micro-structured matrix to be made anti-adhesive, the surface treatment of the single micro-structured matrix being performed before the provisional placing on the adhesive layer of the single micro-structured matrix, and a neutralization step of the surface treatment of the single micro-structured matrix before the final placing of the single micro-structured matrix on the additional adhesive layer, the neutralization step of the surface treatment of the single micro-structured matrix being performed by application of an oxidizing plasma in a vacuum.