Document imaging system with improved exposure uniformity at ima

Details Document imaging system with improved exposure uniformity at ima Document imaging system with improved exposure uniformity at ima

1982-04-30

1984-05-01

Wintercorn, Richard A.

Photocopying

Projection printing and copying cameras

Illumination systems or details

350450, 354296, G03B 2772

Patent

active

044457740

ABSTRACT:
The invention discloses the use of a corrector element placed in an imaging system to selectively vignette energy emanating from the exit pupil of a lens as a function of the field angle of the lens. Several imaging systems are disclosed which illustrate the technique used in determining optimum design and location of the corrector elements.

REFERENCES:
patent: 3097255 (1963-07-01), Farquhar et al.
patent: 3504960 (1966-10-01), Harper
patent: 3669538 (1970-08-01), Fowler
patent: 3777135 (1973-12-01), Rees
patent: 4229097 (1980-10-01), Vulmiere et al.
patent: 4298274 (1981-11-01), Rees et al.
"Lenses in Photography", Rudolph Kingslake, Garden City Books (1951), pp. 100, 101.

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