Photocopying – Projection printing and copying cameras – Illumination systems or details
Patent
1979-07-13
1981-02-17
Hartary, Joseph W.
Photocopying
Projection printing and copying cameras
Illumination systems or details
250559, 250571, 356444, G03B 2752
Patent
active
042511577
ABSTRACT:
A strip of negatives is transported over a slit extending transverse to transport, and the image of successive slit-like elements of each original is projected onto the row of photosensitive zones of a CCD image sensor unit. A photodetector also receives the image of each slit-like element, either simultaneously with the CCD image sensor unit or earlier at a more upstream location, and generates an output signal indicating the average transparency of the whole slit-like image element. The average-transparency signal is used to control the clocking frequency of the clock signal which drives the CCD image sensor unit, either by changing the clocking frequency for each read-out of the image sensor unit or by changing the clocking frequency once per original, in the latter case a peak detector circuit being used to ascertain the transparency of the maximum transparency slit-like element of each original. The CCD image sensor unit may be of the type whose clock signal identically establishes the read-out rate of the photosensitive zones of the CCD and the charge-accumulation interval thereof, or may be of the type whose clock signal establishes the charge-accumulation interval without establishing the read-out rate.
REFERENCES:
patent: 3690765 (1972-09-01), Richard et al.
patent: 3734611 (1973-05-01), Knapp et al.
patent: 3981579 (1976-09-01), Weinert et al.
patent: 3984184 (1976-10-01), Pflugbeil
patent: 4099064 (1978-07-01), Grossman
Knor Bernhard
Payrhammer Bernd
Wahl Helmut
AGFA-Gevaert A.G.
Brady W. J.
Hartary Joseph W.
Striker Michael J.
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