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:

1975-07-24

Pagination or Media Count:

7.0

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