Method of eliminating cushion distortion

Details Method of eliminating cushion distortion Method of eliminating cushion distortion

1990-01-10

1991-01-29

Hayes, Monroe H.

Photocopying

Projection printing and copying cameras

Distortion introducing or rectifying

355 47, G03B 2768

Patent

active

049890344

ABSTRACT:
A method of eliminating cushion distortion when adjusting reproduction equipment comprising a picture plane, an objective plane, and an original plane. The cushion distortion results optionally from a glass plate being inserted in the path of the rays. The invention is based on the principle that the direction of light is the same irrespective of the direction in which the light moves. By employing this principle a cushion distorted picture can be reproduced as an undistorted picture if an additional glass plate of a suitable thickness is inserted in the path of the rays. The additional glass plate must, however, be situated on the opposite side of the objective. A glass plate supporting the light-sensitive material is not quite plane either which per se can result in a certain degree of cushion distortion. Such a distortion can also be eliminated by the insertion of an additional glass plate in the path of the rays.

REFERENCES:
patent: 1541555 (1925-06-01), Fairchild et al.
patent: 4541688 (1985-09-01), Watt et al.
patent: 4678321 (1987-07-01), Inokuchi
Aberrations of the Symmetrical Optical System, W. T. Welford, 1974, Academic Press, PTO Scientific Library, p. 188.

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