Photocopying – Projection printing and copying cameras – Illumination systems or details
Patent
1975-09-29
1977-11-01
Gonzales, John
Photocopying
Projection printing and copying cameras
Illumination systems or details
355 71, G03B 2774, G03B 2778
Patent
active
040563197
ABSTRACT:
The originals to be photographed are transported past a measuring station and an aperture at a filming station. The microfilm is transported past a film aperture at the filming station. The originals vary in length (measured in the direction of transport) from a maximum to a minimum length. The measuring station is spaced a distance from the filming station which corresponds to the maximum length. Each original is scanned in a direction perpendicular to the direction of transport at the measuring station and the peak amount of light reflected from the original is stored. The number of storage units is equal to the number of originals of smallest length which can be accommodated in the distance between the filming and measuring stations. For each storage unit, a monostable multivibrator is furnished which is started when the corresponding original leaves the measuring station and whose time constant is such that its trailing edge occurs just prior to the time the same original reaches the filming station. A step switch controlled by the trailing edges of the multivibrators connects the output of each storage unit in turn to the input of a differential amplifier whose output in turn controls the position of a filter or diaphragm controlling the light falling on the original at the filming station.
REFERENCES:
patent: 3778154 (1973-12-01), Dennhardt et al.
AGFA-Gevaert A.G.
Gonzales John
Striker Michael J.
LandOfFree
Microfilm recording apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Microfilm recording apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Microfilm recording apparatus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-5374