Method of making fluorescent discs

Abstract

A method of obtaining a hybrid fluorescent optical disc, that includes subsequent layer-by-layer forming of information-carrying layers with microrelief like pits or spiral grooves, filling of ROM, WORM or RW microrelief with fluorescent material and assembling them together to form a multilayer structure.

1 . A method of making a multilayer hybrid fluorescent optical disc with fixed luminescence pits or grooves, comprising: 
 preparing a relief surface having optically detectable marks in an optically transparent layer;    filling the optically detectable marks with a liquid polymerizable composition;    polymerizing the liquid polymerizable composition to form a polymerized layer capable of carrying information; and    assembling at least two polymerized layers into a single unit to form a multilayer disc.    
   
   
       2 . The method of  claim 1 , wherein the relief surface is prepared by hydrolysis, oxidation, halogenization, sulfating, amination, processing by surface-active substances, deposition of antistatic substances, application of adhesion promoters, covering with a film of another chemical nature, plasma-chemical processing, or processing in crown charge.  
   
   
       3 . The method of  claim 1 , which further comprises rotating the layer to remove volatile components of the composition and to concentrate fluorescent material in the composition in the optically detectable marks.  
   
   
       4 . The method of  claim 3 , which further comprises depositing the composition in a central location of the layer as the layer is rotated.  
   
   
       5 . The method of  claim 1 , which further comprises applying a transparent auxiliary plane to the layer to provide an assembled substrate with the optically detectable marks being filled through a hole in the assembled substrate.  
   
   
       6 . The method of  claim 5 , wherein the auxiliary plane is applied by fixing the plane mechanically to layer or by adhering the edges of the plane and layer together.  
   
   
       7 . The method of  claim 5 , further comprising separating the assembled substrate to obtain the filled marks.  
   
   
       8 . The method of  claim 1 , wherein the liquid polymerizable composition is polymerized photochemically or thermally.  
   
   
       9 . The method of  claim 1 , wherein the liquid polymerizable composition comprises a luminophore.  
   
   
       10 . The method of  claim 9 , which further comprises reducing the concentration of the luminophore on the surface outside the optically detectable marks, and wherein the layer is provided with a complete coating of the liquid polymerizable composition on its surface.  
   
   
       11 . The method of  claim 10 , wherein the concentration of the luminophore is reduced by etching, exposure to radiation, or contacting a fluorescence quencher.  
   
   
       12 . The method of  claim 1 , wherein the polymerized layers are assembled by gluing the layers together by autoclave pressing, connecting adhesive polymer films between the layers, or by applying and polymerizing monomers or oligomers between the layers.  
   
   
       13 . The method of  claim 1 , further comprising etching the surface after polymerizing the composition to remove the polymerized composition from the surface outside the optically detectable marks.  
   
   
       14 . The method of  claim 13 , wherein the liquid polymerizable composition does not contain a luminophore and which further comprises contacting the etched substrate with a luminophore, and subsequently polymerizing the luminophore onto the polymerized composition in the filled marks.