Accession Number : ADD001541

Title :   Method of Forming a Precision Pattern of Apertures in a Plate.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON D C

Personal Author(s) : Leinkram,Charles Z

Report Date : 01 Oct 1974

Pagination or Media Count : 6

Abstract : The patent describes a method of forming a precision geometrical pattern of apertures in a plate comprising the steps of coating an optically polished plate of metal such as copper with a layer of nickel or chromium and coating the primary layer of nickel or chromium with a thin layer of gold; forming the aperture pattern in the gold layer using conventional photo-etching techniques; and removing the nickel or chromium and the copper from the aperture area by etching. The article thus formed is a heavy copper ring having a central opening across which extends an ultra-thin film of gold precisely apertured in the desired geometrical pattern.

Descriptors :   *Metal films, *Patents, Apertures, Patterns, Thin films, Deposition, Etching, Photoengraving, Gold, Nickel, Chromium, Aluminum, Copper, Metal plates, Ultraviolet optical materials

Subject Categories : Fabrication Metallurgy
      Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE