Optical disk, method for producing the same, and apparatus for producing the same

Abstract

An optical disk of the present invention includes a first substrate having a signal area on a principal plane and a central hole, and a second substrate that is transparent and attached to the first substrate. The second substrate is thinner than the first substrate, and has a central hole whose diameter is larger than that of the first substrate. The first substrate and the second substrate are attached to each other with radiation curable resin (adhesive member) disposed therebetween so as to extend at least from an inner peripheral edge of the second substrate to an outer peripheral edge thereof.

1 - 34 . (canceled)  
     
     
         35 . An apparatus for producing an optical disk including a first substrate in which a central hole A is formed and a second substrate in which a central hole B is formed, comprising: 
 a coating member for coating at least one substrate selected from the group consisting of the first substrate and the second substrate with radiation curable resin;    a disposing member for disposing the first substrate and the second substrate so that a center of the first substrate is aligned with a center of the second substrate; and    an irradiating member for irradiating the radiation curable resin with radiation.    
     
     
         36 . An apparatus for producing an optical disk according to  claim 35 , wherein the disposing member includes a pin that fits in the first and second central holes A and B.  
     
     
         37 . An apparatus for producing an optical disk according to  claim 36 , wherein the pin includes a first pin that fits in the central hole A and a second pin that fits in the central hole B.  
     
     
         38 . An apparatus for producing an optical disk according to  claim 37 , wherein the second pin has a cylindrical shape, and the first pin is inserted into the second pin.  
     
     
         39 . An apparatus for producing an optical disk according to  claim 35 , wherein the disposing member includes a table for fixing the at least one substrate.  
     
     
         40 . An apparatus for producing an optical disk according to  claim 39 , wherein the disposing member further includes a container surrounding the table and an exhaust member for exhausting the container.