Device for achieving a substantially uniform distribution of the

Details Device for achieving a substantially uniform distribution of the Device for achieving a substantially uniform distribution of the

1989-01-05

1989-09-19

Wintercorn, Richard A.

Photocopying

Projection printing and copying cameras

Illumination systems or details

G03B 2772

Patent

active

048686042

ABSTRACT:
A device for achieving a substantially uniform distribution of the light in the picture plane of a reproduction camera by providing a suitable distribution of the light in the original plane (8), whereby the desired distribution of the light in the original plane is obtained by means of illuminating means comprising adjustable screening members (12). According to the invention the screening members are adjusted by means of a computer in response to the desired enlargement. A light sensor adjacent the picture plane compensates automatically for the influence of the screening members on the main exposure.

REFERENCES:
patent: 4426153 (1984-01-01), Libby et al.

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