Method of manufacturing disk substrate, and method and device for manufacturing optical disk

Abstract

A method for producing a disk-shaped substrate 10 used for producing an optical disk includes: (a) forming a protective layer 12 a that is larger in area than the disk-shaped substrate 10 on a surface of a transparent plate 11 a ; and (b) cutting a portion of the plate 11 a with the protective layer 12 a formed thereon other than an outer edge portion of the protective layer 12 a to form a disk shape. According to this producing method, a thin substrate can be prevented from being damaged by forming a protective layer. Furthermore, according to this producing method, a protective layer with a uniform thickness can be formed.

1 - 32 . (canceled)  
     
     
         33 . A method for producing an optical disk using a first substrate and a second substrate, comprising: 
 punching out a transparent plate with a protective film formed on one principal plane to form the second substrate;    attaching the first substrate and the punched out second substrate to each other so that the protective film is placed outside; and    peeling the protective film.    
     
     
         34 . (canceled)  
     
     
         35 . A method for producing an optical disk according to  claim 33 , wherein the step of attaching further comprises: 
 coating at least one substrate selected from the first substrate and the second substrate with radiation-curable resin;    for stacking the first substrate and the second substrate so that a center of the first substrate is matched with a center of the second substrate; and    irradiating the radiation-curable resin.    
     
     
         36 . A method for producing an optical disk according to  claim 35 , further comprising rotating the stacked first substrate and second substrate.  
     
     
         37 . A method for producing an optical disk according to  claim 35 , wherein the the step of coating further comprises dropping the radiation-curable resin onto the at least one substrate and rotating the at least one substrate, and 
 the step of stacking occurs in a container that can be evacuated.    
     
     
         38 . The method for producing an optical disk according to  claim 35  in which a signal area is to be formed on one principal plane of the second substrate, further comprising: 
 supporting a second principal plane of the second substrate, which is an opposite side of the one principal plane; and    fixing the second principal plane to a support.    
     
     
         39 . A method for producing an optical disk according to  claim 38 , further comprising forming at least one film selected from a metal film, a dielectric film, a magnetic film and a coloring film on the one principal plane.  
     
     
         40 . (canceled)  
     
     
         41 . A method for producing an optical disk according to  claim 38 , further comprising a step of irradiating a side opposite to a side where the second substrate is placed with respect to the support, wherein the support is made of a radiation-permeable material.  
     
     
         42 . A method for producing an optical disk according to  claim 38 , wherein the second substrate has a circular through-hole at a center thereof, and the step of fixing further comprises pressing at least one selected from an inner peripheral edge and an outer peripheral edge of the second substrate to the support side.  
     
     
         43 . A method for producing an optical disk according to  claim 38 , further comprising forming the signal area on the one principal plane of the second substrate.  
     
     
         44 . A method for producing an optical disk according to  claim 33 , wherein the protective film has a greater hardness than that of the second substrate.