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AssigneeHarold C. Hohbach
InventorsViola F. Burroughs, Hasso G. Vahl, Harro W. D. Wahl
Estimating the term…
In the method for making an article having a replicated coating with a durable dielectric overcoat. A master is formed having a surface to be replicated formed thereon. A parting compound such as silicon oil is placed on the surface while under a vacuum. An optical coating is formed in reverse order, with the protective coat first and the reflective coat last, on the coated surface while in the vacuum under a low temperature to cause initial curing of the protective coat without reevaporation of the silicon oil. Thereafter, the optical coating on the master is post-cured in air at an elevated temperature to cause final curing and hardening of the protective coat. After the post-curing has been completed, the replicated part, if desired, is transferred to the part to carry the same and is mounted thereon by a sealing plastic.
In a method for forming replicated optical parts, producing a master having a surface to be replicated formed thereon, depositing in a vacuum a parting agent in the form of a silicon oil on to the surface to form a thin parting layer of the silicon oil, forming a protective coating on the parting layer in a vacuum at a relatively low temperature ranging from approximately 40.degree. to 100.degree. C but at a sufficiently high temperature to cause an initial partial curing of the protective coat, forming an optical coating on the protective coat at a relatively low temperature ranging from approximately 40.degree. to 100.degree. C, and post-curing the part with the coats thereon in air at an elevated temperature in excess of approximately 200.degree. C for a minimum period of time in excess of approximately 4 hours to cause final curing and hardening of the protective coat.
A method as in claim 7 wherein the step of bonding the master to the supporting element is carried out by the use of an epoxy and curing the epoxy to form the bond.
In a method for forming replicated optical parts, producing a master having a surface to be replicated formed thereon, depositing by evaporation in a first vacuum chamber on said surface a thin layer of silicon oil to serve as a parting layer, removing the master from the first vacuum chamber and transferring the same to a second vacuum chamber and minimizing the contamination from air during the transfer, forming a protective coat on the surface of the master in the second vacuum chamber at a temperature ranging from approximately 40.degree. C to 100.degree. C to cause an initial partial curing of the protective coat while retaining the silicon oil parting layer intact, forming an optical coating on the protective coat in the second vacuum chamber at a relatively low temperature from approximately 40.degree. C. to 100.degree. C, and post-curing the part with the coats thereon in air at an elevated temperature in excess of approximately 200.degree. C for a minimum period of time in excess of approximately 4 hours to cause final curing and hardening of the protective coat.
Dependencies are inferred from the claim text.