Compact objective lens with enhanced distortion for near-infrared imaging

US11360292B2 · kind B2 · utility

Assignee

• The United States of America as represented by the Secretary of the Army · US

Inventors

• John M. Hall · Alexandria, US
• Andrew J. Dotson · Washington, US
• Brian D. Kellermeyer · Woodlawn, US

Key dates

• Filing date: Feb 4, 2020
• Grant date: Jun 14, 2022
• Expiry date: Mar 5, 2041

Classification

• Technology area (CPC G): Physics
• CPC primary: G02B13/0045
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

The current invention describes a compact objective lens with enhanced distortion for near-infrared imaging, comprising a positively powered, aspheric, and meniscus first lens element; a negatively powered, aspheric, and meniscus second lens element; a positively powered, aspheric, and biconvex third lens element; a negatively powered, aspheric, and meniscus fourth lens element; a negatively powered, aspheric, and meniscus field corrector element; and a detector assembly comprising a window and a detector plane where the light rays come to focus.