Lens molding die and a producing method therefor

Abstract

A lens molding die for producing a lens, which comprises a base member made of a hard material and having one surface of a predetermined shape; and a resin-molded layer formed on the one surface of the base member and having a surface shape corresponding to a predetemined shape of a lens to be molded. The resin-molded surface is to be made of a resin material which is inactive with a material which is to be molded by the lens molding die. The resin-molded layer is formed by introducing the material into the space formed between the one surface of the base member and a transfer surface formed on a transfer die correspondingly to the surface of a lens to be produced to be cured by heat or ultraviolet rays.

1 . A method for producing a lens molding die, comprising: 
 preparing a base member made of a hard material and having one surface of a predetermined shape; and    forming a resin-made surface layer on said one surface of the base member to have a surface shape corresponding to a predetermined shape of one surface of a lens to be produced.    
   
   
       2 . The method for producing a lens molding die according to  claim 1 , wherein the predetermined shape of said one surface of the base member is spherical while the surface shape of the resin-molded surface layer is aspherical.  
   
   
       3 . The method for producing a lens molding die according to  claim 1 , wherein said resin-molded surface layer is formed by a material which is inactive with a material to be molded by said lens molding die.  
   
   
       4 . The method for producing a lens molding die according to  3 , wherein said material of the surface layer is a thermosetting resin material, and wherein said surface layer is formed by heating said material.  
   
   
       5 . The method for producing a lens molding die according to  3 , wherein said material of the surface layer is a ultraviolet-curable resin material, and said surface layer is formed by projecting ultraviolet rays thereon.  
   
   
       6 . A method for producing a lens molding die, which comprises: 
 preparing a base member made of a hard material and having one surface of a predetermined shape;    preparing a transfer die made of a hard material and having a transfer surface of another predetermined shape;    disposing said transfer die and said base member by facing said transfer surface of the transfer die to said one surface of the base member to form a predetermined space therebetween;    introducing a resin-material into said predetermined space; and    hardening said resin-material to form a molded resin layer on said one surface of the base member, said molding die comprising said base member and said molded resin layer.    
   
   
       7 . The method for producing a lens molding die according to  claim 6 , wherein the predetermined shape of said one surface of the base member is spherical while said another predetermined shape of the transfer surface is aspherical.  
   
   
       8 . The method for producing a lens molding die according to  claim 7 , wherein said molded resin layer is formed by a material which is generally inactive with a material to be molded by said lens molding die.  
   
   
       9 . The method for producing a lens molding die according to  8 , wherein said material of the molded resin layer is a thermosetting resin material, and wherein said molded resin layer is formed by heating said material.  
   
   
       10 . The method for producing a lens molding die according to  8 , wherein said material of the molded resin layer is a ultraviolet-curable resin material, and said molded resin layer is formed by projecting ultraviolet rays thereon.  
   
   
       11 . The method for producing a lens molding die according to  claim 10 , wherein said base member is made of a generally transparent material and said ultraviolet rays are projected to said layer through said base member.  
   
   
       12 . The method for producing a lens molding die according to  claim 10 , wherein said transfer die is made of a transparent material and said ultraviolet rays are projected to said layer through said transfer die.  
   
   
       13 . The method for producing a lens according to  claim 7 , which comprises: 
 preparing a first lens molding die having the molded resin surface of a first predetermined shape corresponding to one surface shape of the lens to be produced;    preparing a second lens molding die having the molded resin surface of a second predetermined shape corresponding to another surface shape of the lens to be produced;    disposing said first and second lens molding dies with facing the molded resin layers thereof toward each other to form a predetermined space therebetween;    introducing a material into said predetermined space; and    hardening said material to form the lens having said one and another surfaces.    
   
   
       14 . A lens produced by said method for producing a lens defined in  claim 13.