Back to results
US 5,847,880 AGranted
60 degree field of view eyepiece
AssigneeThe United States of America as represented by the Secretary of the Army
InventorRobert A. Spande
Life of this patent
Estimating the term…
Abstract
An optical eyepiece assembly for providing a sixty degree field of view cbility to an image intensifier. The assembly includes first and second air-spaced lens doublets, a first lens, filter element, and second lens.
Claims1
An optical eyepiece assembly for providing a sixty degree field of view capability to an image intensifier comprising:
- a first air-spaced lens doublet positioned on the optical axis after an aperture stop for accepting incoming light and providing eye relief distance;
- a second air-spaced lens doublet positioned after the first air-spaced lens doublet positioned on the optical axis for providing optical magnification;
- a first lens positioned after the second air-spaced lens doublet on the optical axis for flattening output from the second air-spaced lens doublet;
- a filter element positioned after the first lens on the optical axis for spectrum filtering an output from the first lens;
- a second lens positioned after the filter element on the optical axis for flattening output from the filter element which is input through an input substrate of an image intensifier whereby a 60 degree field of view is effected with reduced eye relief distance and increased stop diameter.
2 more elements
Dependencies are inferred from the claim text.