Contoured transparency providing reduced optical distortion and

Details Contoured transparency providing reduced optical distortion and Contoured transparency providing reduced optical distortion and

1984-09-04

1987-07-28

Corbin, John K.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

350417, 351159, G02B 500, G02C 702

Patent

active

046828567

ABSTRACT:
A contoured transparency such as an aircraft windshield or canopy, and a method for making it, that provides reduced optical distortion for a pilot seating beneath it. The transparency is configured to have a tailored thickness gradient across its surface such that light passing obliquely through it and converging at a predetermined low distortion point is refracted in such a way the optical distortion is minimized. In one embodiment, the thickness gradient is selected such that light passing obliquely through it and converging on a single point follows a path after exiting the transparency that substantially parallels its path before entering the transparency. This eliminates angular deviation of a line of sight from that specific low distortion point. In another embodiment, the thickness gradient is selected such that the angle between the lines of sight of the pilot's two eyes to a remote target remains unchanged after passing through the transparency. This eliminates binocular deviation.

REFERENCES:
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Angular Deviation and Its Effect on Hud-Equipped Aircraft Weapons Sighting Accuracy, by Louis V. Genco, Lt Col, USAF, Air Force Aerospace Medical Research Laboratory, Aug. 1982 (Wright-Patterson Air Force Base, Ohio 45433).
Pilot Reactions to Optical Defects Found in F-111 Bird Impact Resistant Windscreens, by Shelton MacLeod, PhD, Robert G. Eggelston, Major, USAF, Air Force Aerospace Medical Research Laboratory, Dec. 1980 (Wright-Patterson Air Force Base, Ohio 45433).
Computer Analysis and Correction of the Optical Distortion in the F-111 Bird Impact Resistant Windscreen, by Rich Seid, Major, USAF, Air Force Aerospace Medical Research Laboratory, Dec, 1982 (Wright-Patterson Air Force Base, Ohio 45433).
Optical Factors in Aircraft Windshield Design as Related to Pilot Visual Performance, by Walter F. Grether, Jul. 1973, Aerospace Medical Research Laboratory (Wright-Patterson Air Force Base, Ohio).

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