Method of transferring an optical quality film

Abstract

An optical quality film is transferred from a master optical surface to a condary substrate by means of a replication technique using a master optical surface as a mold.

What is claimed is: 
     
       1. Method of transferring a relatively thick metal film of excellent conductivity and of high optical quality to a secondary substrate from a master substrate, said method including the steps of: (A) evaporation depositing an adhesion film followed by a conductive film onto a master substrate while exposing the assembly to air between evaporations,   (B) electroplating a layer of the same conductive film onto the conductive film of step (A) of sufficient thickness to achieve the necessary conductivity in the electroplated layer,   (C) bonding a secondary substrate to the electroplated layer with a replication cement, and   (D) separating the secondary substrate and both bonded conductive layers from the adhesion coated master leaving the optical quality surface of the conductive electrode exposed.   
     
     
       2. Method according to claim 1 wherein the adhesion film is a chrome film and wherein the conductive film is copper. 
     
     
       3. Method according to claim 2 wherein each of the films of claim 2 is about 1000Å in thickness. 
     
     
       4. Method according to claim 1 wherein in step (B), electroplating is carried in a solution containing 400 parts water, 100 parts CuSO 4 . 5H 2  O, and 4-10 parts H 2  SO 4 .