Photocopying – Projection printing and copying cameras – Illumination systems or details
Patent
1977-10-18
1979-07-10
Hix, L. T.
Photocopying
Projection printing and copying cameras
Illumination systems or details
355 83, G03B 2778
Patent
active
041605969
ABSTRACT:
A document reproduction illumination/exposure control system, for ascertang the photometric qualities of a document to be photographically reproduced and providing a responsive control signal for illumination and exposure parameters for a document reproduction apparatus, is comprised of a source of radiation for illuminating a document to be reproduced, a detector for receiving radiation incident from the document and generating a radiation-detected signal proportional thereto, storage devices for storing spectral response information regarding the image-recording medium upon which an image of the document is to be reproduced, and an illumination/exposure correction device for receiving a correctional signal representative of the correlation between the radiation-detected signal and the stored spectral response information, whereby illumination and/or exposure parameters for the reproduction apparatus may be appropriately balanced to account for variations in the spectral qualities of the document.
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Brady W. J.
Englert Alvin J.
Hix L. T,.
Pawlikowski Eugene J.
The United States of America as represented by the Secretary of
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