Accession Number : ADD002175

Title :   Low Reflectance Reticle Coatings.

Descriptive Note : Patent Application,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON D C

Personal Author(s) : Blazek,Henry F ; Cutsinger,Charles W

Report Date : 25 Jul 1975

Pagination or Media Count : 10

Abstract : The purpose of the patent application is to provide a technique in constructing a durable non reflective metal plate on an optical element. This is accomplished by using known type cathodic sputtering devices and placing predetermined bias voltages on a substrate material during deposition. The deposition process is stopped at predetermined intervals over the total deposition time and the substrate is allowed to cool while maintaining the parameters used during deposition. This permits a plating of material to be deposited that varys in density and has a surface topography that is uneven from irregular projections protruding from its surface. These projections in the final form are rounded and form a pebble like exterior surface. Using this technique with a smooth optical substrate to form a reticle element permits the metallic surface of the film to not only mask areas of an optical detector but prevents light or infrared rays striking the surface of the reticle pattern to be dispersed by scattering and absorption.

Descriptors :   *Optical coatings, *Infrared detectors, Patents, Reticles, Metal films, Titanium, Zirconium, Sputtering, Optical equipment, Signal to noise ratio

Subject Categories : Infrared Detection and Detectors
      Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE