Scan cameras

Details Scan cameras Scan cameras

1977-04-14

1979-04-03

Griffin, Donald A.

354 94, G03B 3900, G03B 3700

Patent

active

041474198

ABSTRACT:
A wide angle strip camera system which, in combination, includes a wide angle lens, having a curved conjugate focal surface, a first image-receiving surface, a first curved exposure slit disposed adjacent the first image-receiving surface; the lens, first image-receiving surface and first exposure slit being so mounted that a first curved strip at a constant preselected field angle in an object field is focused on the first image-receiving surface; a second image-receiving surface; a second curved exposure slit disposed adjacent the second image-receiving surface; fold flat elements interposed between the lens and the second exposure slit; the lens, fold flat elements, second image-receiving surface, and second exposure slit being so mounted that a second curved strip at a second constant preselected field angle in the object field is focused on the second image-receiving surface. The system is fixedly supported in a vehicle, such as an aircraft, whereby the forward velocity of the vehicle provides image motion. The exposure slits are curved to correspond to field points of equal range, respectively, so that there is negligible differential image motion within the slits, the slits being of such width in the direction of vehicle motion as to result in uniform exposure; and the image-receiving surfaces are driven in the direction of vehicle movement at speeds corresponding to the altitude-velocity ratio of the vehicle with respect to the object field.

REFERENCES:
patent: 2969005 (1961-01-01), Blackstone
patent: 3653307 (1972-04-01), De Heere et al.
patent: 3821763 (1974-06-01), Scott
patent: 3934259 (1976-01-01), Krider
patent: 4033687 (1977-07-01), Hirayama et al.

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