Imaging system for compensating for image distortion due to wrin

Details Imaging system for compensating for image distortion due to wrin Imaging system for compensating for image distortion due to wrin

1987-09-18

1988-08-09

Wintercorn, Richard A.

Photocopying

Projection printing and copying cameras

Distortion introducing or rectifying

355 8, 355 75, G03B 2768

Patent

active

047631732

ABSTRACT:
A document imaging system is compensated for distortion caused by non-planarity in the documents by providing a positive lens with varying power at a location beneath the document platen. In a preferred embodiment, an aspheric fresnel lens is used as the compensating optical element.

REFERENCES:
patent: 3980405 (1976-09-01), Tatsuno et al.
patent: 4043665 (1977-08-01), Caldwell
patent: 4335954 (1982-06-01), Phelps
patent: 4538185 (1985-08-01), Wiggins
patent: 4723154 (1988-02-01), Kuwayama
Rudolf Kingslake; "Lenses in Photography (The Practical Guide to Optics for Photographers)"; Published by the Case-Hoyt Corporation for Garden City Books.
John R. Egger; "Use of Fresnel Lenses in Optical Systems; Some Advantages and Limitations"; Optical Sciences Group, SPIE; vol. 193, Optical Systems Engineering, (1979).

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