Device for correcting the total distortion caused by the shape o

Details Device for correcting the total distortion caused by the shape o Device for correcting the total distortion caused by the shape o

1988-10-26

1990-02-20

Henry, Jon W.

350447, 350421, G02B 504, G02B 2700

Patent

active

049020986

ABSTRACT:
Device used in aviation for in-flight reception of images corrects distortion resulting from the observation of a field of view through a wall (1) which is transparent in a given spectral band and whose shape distorts the image of the scene formed on a receiver (4). An optical system arranged between the receiver and the wall performs an anamorphotic function in one direction and a deviation function in another direction perpendicular thereto. The deviation function is realized by a single prism formed by two parts (5,6) cemented to one another and which have different refractive indices so as to form an achromatic assembly. The anamorphotic function is obtained by a slight change of the focal length of the receiver in conjunction with the elongation of lines formed by the prism in the direction of the deviation function.

REFERENCES:
patent: 3353892 (1967-11-01), Minns et al.
patent: 4634241 (1987-01-01), Kohayakawa et al.

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