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US 5,347,391 AGranted
Ultra wide field of view scanning surveillance optical system
AssigneeHughes Aircraft Company
InventorsLacy G. Cook, Bryce A. Wheeler
Life of this patent
Estimating the term…
Abstract
A refractive inverse telephoto optical system (10) has a first lens doublet (12), a Pechan prism assembly (14) and a second lens doublet (16). The Pechan prism assembly (14) is spaced between the front negative doublet (12) and the rear positive doublet (16). The Pechan prism assembly (14) may be rotated and, as rotation occurs, the associated linear detector array is rotated around within the optical field of view.
Claims16
A refractive optical system comprising:
- first lens means for receiving light from a scene;
- prism means for redirecting said light, said prism means including a singlet lens and being positioned to receive light from said first lens means, said prism means enabling scanning of an ultra wide field of view of said scene;
- second lens means for focusing said light on a viewing plane, said second lens means positioned to receive light from said prism means such that said ultra wide field of view of said scene is focused on a detection plane.
A refractive optical system comprising:
- a first lens doublet for receiving light from a scene;
- a Pechan prism assembly for receiving and redirecting said light from said first lens doublet, said Pechan prism assembly including a lens positioned to receive light between halves of said Pechan prism and providing scanning of an ultra wide field of view of said scene to be viewed;
- and
- a second lens doublet for receiving light from said Pechan prism and focusing said light on a detection plane such that said ultra wide field of view may be detected at said detection plane.
1 more element
A refractive inverse telephoto optical system comprising:
- a first negative power lens doublet for receiving light from a scene;
- a Pechan prism for receiving and redirecting said light from said first lens doublet, said Pechan prism providing scanning of an ultra wide field of view of said scene to be viewed;
- a singlet lens positioned to receive light between halves of said Pechan prism;
- and
- a second positive power lens doublet for receiving light from said Pechan prism and focusing said light on a detection plane such that said ultra wide field of view may be detected at said detection plane.
2 more elements
Dependencies are inferred from the claim text.