Infra-red lenses

Details Infra-red lenses Infra-red lenses

1986-04-09

1987-06-30

Arnold, Bruce Y.

350423, G02B 1520

Patent

active

046765816

ABSTRACT:
An infra-red objective zoom lens has a fixed front positive singlet, a movable negative component, a movable positive singlet and a fixed rear component. The zoom lens can be relatively short and can be used with an "eye-piece" lens to form an infra-red afocal telescope. The system can be further shortened by using a rear group of telephoto form. The fixed front positive singlet is shaped so that at high magnification it gives undercorrected third and fifth order spherical aberration, and the moveable negative component has at least one lens element shaped so that at high magnification the negative component gives compensating overcorrected third and fifth order spherical aberration.

REFERENCES:
patent: 3679286 (1972-07-01), Klein
patent: 4148548 (1979-04-01), Thompson
patent: 4206973 (1980-06-01), Ikemori
patent: 4240699 (1980-12-01), Sato et al.
Mann, "Infrared Zoom Lens System for Target Detection", Optical Engineering, vol. 21, No. 4, Jul./Aug. 1982, pp. 786-793.

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