Device for adjusting exposure amount

Details Device for adjusting exposure amount Device for adjusting exposure amount

1987-03-06

1988-03-01

Wintercorn, Richard A.

Photocopying

Projection printing and copying cameras

Illumination systems or details

G03B 2772

Patent

active

047289953

ABSTRACT:
A device for adjusting the amount of exposure for use in copying machines or in the original reading device of facsimile systems comprises an illumination system having a first illumination optical path and a second illumination optical path through which the light from a light source is concentrated on the surface of an original for illumination. The amounts of light through both the first and second optical paths are controllable to provide an adjusted uniform amount of exposure without impairing the balance between the two paths in the amount of light. A single light blocking member disposed at the intersection of the first and second optical paths and movable into the paths regulates the amounts of light through the two paths. The device is therefore simple in construction and inexpensive.

REFERENCES:
patent: 4257086 (1981-03-01), Gulliksen
patent: 4333130 (1982-06-01), Mochizuki et al.
patent: 4627704 (1986-12-01), Hamasaki et al.

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