Accession Number : ADD002174

Title :   Reticle-Lens System and Method.

Descriptive Note : Patent Application,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON D C

Personal Author(s) : Hunt,Robert E ; Moore,Kenneth L

Report Date : 24 Jul 1975

Pagination or Media Count : 7

Abstract : The patent application relates to reticles employed in infra-red detector systems, particularly to a reticle-lens system which is effective in reducing back reflectance noise. In a missile seeker system, for example, in which an infra-red detector is used as a guidance feature, a reticle is generally placed in the line of sight of the missile optics before the detecting circuitry. In prior reticles a problem existed when back reflectance in the reticle-lens system caused undesirable background noise. Reflectance background noise is reduced to a minimum by successively depositing a thin film of aluminum on the face of the sapphire reticle substrate, chemically etching a reticle pattern in the aluminum, oxidizing the remaining aluminum and, finally depositing a film of titanium on the oxidized aluminum before etching the final reticle pattern.

Descriptors :   *Infrared homing, *Optical lenses, *Reticles, Patents, Alumina, Sapphire, Aluminum coatings, Titanium, Thin films, Etching, Background noise, Infrared detectors, Guided missile components

Subject Categories : Metallurgy and Metallography
      Guided Missiles
      Infrared Detection and Detectors
      Air Navigation and Guidance

Distribution Statement : APPROVED FOR PUBLIC RELEASE