Exposure controlling apparatus

Details Exposure controlling apparatus Exposure controlling apparatus

1989-10-03

1990-07-03

Hayes, Monroe H.

Photocopying

Projection printing and copying cameras

Multicolor picture

355 71, G03B 2772, G03B 2776

Patent

active

049395378

ABSTRACT:
A color copying machine for copying an image on a photosensitive material having a movable scanning exposure element with a light source for irradiating a document to be copied and projecting light reflected from the document through a window. At most, two of three primary color filters correct the spectral intensity of the light by being inserted into the light path in both directions perpendicular to the direction in which the photosensitive material is conveyed. The ratio of the total area of a sectional plane of the light path to the area of the sectional plane covered by the color correction filter is adjusted to obtain the required spectral intensity. At least one diaphragm in the light path regulates the sectional plane of the light path whereby the controlled diaphragm does not cause a change in the adjusted ratio, and the amount of light is regulated without changing the corrected spectral intensity thereof.

REFERENCES:
patent: 3260152 (1966-07-01), Aston
patent: 3299773 (1967-01-01), Jasny
patent: 4189227 (1980-02-01), Barbieri
patent: 4191466 (1980-03-01), Gandini
patent: 4319834 (1982-03-01), Terrill
patent: 4368974 (1983-01-01), Coote et al.
patent: 4375918 (1983-03-01), Isono et al.

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