Method and apparatus of optical information recording medium, and optical information recording medium

Abstract

An optical disk is manufactured by bonding a resin stamper having, on a principal plane, asperity pits on which a thin film is formed and a second substrate having a thickness of 0.3 mm or less with radiation cured resin such that the asperity pits face to the second substrate. The resin stamper is peeled off after curing the radiation cured resin to form asperity pits on the second substrate. A metal film is formed on the asperity pits on the second substrate to attain an information recording layer on the second substrate. A first substrate having an information recording layer and the second substrate having the formed information recording layer are bonded such that the both information recording layers face each other.

What is claimed is:  
     
         1 . An optical information recording medium comprising: 
 a first substrate having a thickness of 0.3 mm or less and having a groove or asperity pits formed thereon by a radiation cured resin and a thin film; 
 a second substrate; and  
 a metal film or a recording film on the groove or the asperity pits on the first substrate so as to create an information recording layer on the first substrate, wherein  
 the first substrate and the second substrate are bonded such that the information recording layer is placed between the first and second substrates.  
   
     
     
         2 . An optical information recording medium having a substrate, comprising: 
 a information recording layer formed on the substrate;    at least one basic layer which is stacked on the information layer, and includes an intermediate layer and a recording layer; and    a light transmission layer formed on the basic layer.    
     
     
         3 . The optical information recording medium according to  claim 2 , the basic layer further includes a protection layer.  
     
     
         4 . The optical information recording medium according to  claim 2 , wherein a thickness of the light transmission layer is 0.3 mm or less.  
     
     
         5 . The optical information recording medium according to  claim 4 , wherein the thickness of the light transmission layer is substantially 0.1 mm.  
     
     
         6 . The optical information recording medium according to  claim 5 , wherein the thickness of the basic layer is 15 μm to 45 μm.  
     
     
         7 . The optical information recording medium according to  claim 2 , wherein the light transmission layer comprises radiation cured resin.  
     
     
         8 . The optical information recording medium according to  claim 2 , wherein the light transmission layer comprises radiation cured resin and a resin substrate.  
     
     
         9 . The optical information recording medium according to  claim 2 , wherein the recording layer comprises radiation cured resin having the groove or the asperity pits, and a reflective film or a recording film formed on the groove or the asperity pits.  
     
     
         10 . The optical information recording medium according to  claim 2 , wherein the intermediate layer has a function as adhesive.  
     
     
         11 . The optical information recording medium according to  claim 2 , wherein the intermediate layer is made of radiation cured resin.  
     
     
         12 . The optical information recording medium according to  claim 2 , wherein the protection layer has a pencil hardness of B or more.  
     
     
         13 . The optical information recording medium according to  claim 2 , wherein the protection layer is made of radiation cured resin.  
     
     
         14 . The optical information recording medium according to  claim 2 , wherein the protection layer and the intermediate layer have substantially equal refractive indexes.  
     
     
         15 . The optical information recording medium according to  claim 2 , wherein the protection layer and the intermediate layer are substantially transparent to transmit a light for recording or reproducing data.  
     
     
         16 . The optical information recording medium according to  claim 13 , wherein the protection layer is substantially transparent to transmit light for recording or reproducing data.  
     
     
         17 . An optical information recording medium comprising: 
 a first substrate; and    a second substrate which is thinner than the first substrate,    wherein two information recording layers are provided between the first and second substrates.    
     
     
         18 . An optical information recording medium comprising: 
 a first substrate; and    a light transmission layer which is provided on the first substrate and is made of radiation cured resin,    wherein two information recording layers are provided between the first substrate and the light transmission layer.