Photocopying – Projection printing and copying cameras – Distortion introducing or rectifying
Patent
1975-09-05
1977-06-14
Griffin, Donald A.
Photocopying
Projection printing and copying cameras
Distortion introducing or rectifying
354121, 355 55, G03B 100, G03B 2752, G03B 2768
Patent
active
040294102
ABSTRACT:
In a method and apparatus for manipulating line weight in an image representation, and particularly for increasing line weight of a contour map in slope mapping, a lens orbiting attachment is included between a cartographic camera and lens. During exposure of the image, using the attachment, the lens is orbited about the optical axis of the camera in a plane parallel to the image. The diameter of the orbit is stepped, during oribiting, between zero, wherein the lens is concentric with the optical axis of the camera, and a predetermined maximum diameter depending on amount of line spreading required. The resulting trajectory of the lens tends to widen the image lines in all directions on the film to provide uniform line spreading. The lens is contained within inner and outer eccentric ring members, and the eccentricity of the lens relative to the optical axis of the camera depends upon the relative angular orientation of the two members. A first motor rotates both of the eccentric ring members (this causes the lens to orbit about the optical axis of the camera), while a second motor rotates the members relative to each other to change the radius of the orbit. A cam attached to the outer ring member synchronizes stepping of the lens orbit diameter to rotation of the outer eccentric ring member. The result is that the diameter of the lens orbit changes continuously during exposure. The lens floats in a precision ball bearing within the inner ring member so that the lens does not rotate during orbiting. Thus, image distortion, caused by any eccentricity of the lens itself, is eliminated.
REFERENCES:
patent: 2285768 (1942-06-01), Drucker
patent: 2888869 (1959-06-01), Katzen et al.
patent: 3508826 (1970-04-01), Grabau
patent: 3691922 (1972-09-01), Konig et al.
patent: 3692406 (1972-09-01), Blachut et al.
patent: 3772977 (1973-11-01), Guccione
patent: 3915569 (1975-10-01), Polzleitner
Gardiner Donald A.
Griffin Donald A.
Sadowsky Gersten
The United States of America as represented by the Secretary of
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