Metallic vapor deposition lens provided with a protection coat and a method of producing the same

Abstract

A metallic vapor deposition lens provided with a protection coat is provided, the surface of which lens is finished smooth and good at abrasion-proof characteristic. The metallic vapor deposition lens of the invention is characterized in that a filmy layer 2 made from a metallic material m is formed on at least one side surface of a lens proper 1 by vapor deposition and a polymerized and hardening layer 3 made from diethylene glycol bis (allyl carbonate) is overlaid on said metallic deposition filmy layer 2 so as to protect the surface of said filmy layer 2. The coat formation made from this diethylene glycol bis (allyl carbonate) resin over the surface of said metallic deposition filmy layer prevents the same surface from being scratched off and the higher ductility and the lower viscosity of said resin allows the protection coat to be uniformly formed without inconsistency so as to prevent the wavy patterns with rainbow colors owing to the difference in thickness and the interference of the visible light from appearing on the lens surface. This avoids giving a strange look on the wearer's face.

1 - 9 . (canceled)  
     
     
         10 . A method of producing a metallic vapor deposition lens (L) provided with a protection coat comprising the steps of placing a lens proper ( 1 ) in a vacuum chamber (V) and vaporizing a metallic material (m) by means of a heating means with said chamber depressurized so as to form a metallic deposition filmy layer ( 2 ) on a convex side surface of said lens proper ( 1 ); dropping a casting resin R(R) of lower viscosity essentially consisting of diethylene glycol bis (allyl carbonate) into a concave cavity (C) of a casting die (D), which cavity corresponds to a concave side surface of said lens proper ( 1 ); placing on the concave side surface of said cavity (C) said metallic deposition filmy layer ( 2 ) formed on the convex side surface of said lens proper ( 1 ) as taken out of said vacuum chamber (V) so as to uniformly spread and attach said casting resin (R) on said metallic deposition filmy layer ( 2 ) and polymerizing and hardening said resin (R) as spread and attached under heating treatment; and taking out an integral lens prototype (Lb) from said casting die (D) and subjecting said lens prototype (Lb) to finishing treatment so as to produce said lens (L).  
     
     
         11 . A method of producing a metallic vapor deposition lens (L) provided with a protection coat according to  claim 10 , wherein an input amount of said casting resin (R) dropped into the cavity (C) of said casting die (D) is adjusted such that said resin (R) is increased so as to make thicker said polymerized and hardening layer ( 3 ) formed on said metallic deposition filmy layer ( 2 ).  
     
     
         12 . A method of producing a metallic vapor deposition lens (L) provided with a protection coat according to  claim 10 , wherein a whole surface of said lens (L) as finished is subjected to hard coating treatment.  
     
     
         13 . A method of producing a metallic vapor deposition lens (L) provided with a protection coat according to  claim 11 , wherein a whole surface of aid lens (L) as finished is subjected to hard coating treatment.