Photocopying – Contact printing – Light monitoring exposure control
Patent
1974-09-26
1978-02-07
Hix, L. T.
Photocopying
Contact printing
Light monitoring exposure control
G03B 2778
Patent
active
040724190
ABSTRACT:
A frame count cuer for controlling the operation of a continuous photographic film printer either of the continuous motion or incremental motion type. As the "preprint" film and the overlaying "raw stock" are passed through the printer, a signal is generated corresponding to the quantity and direction of travel of the film drawn across the exposure aperture. A counter is incremented or decremented by the signal and provides an integral footage and frame count of the amount of film passing through the printer. The information from a punched scene length tape is used to set a storage unit to the desired scene length and the setting of the storage unit is compared with the counter by a coincidence detector. Upon coincidence, a cue signal is fed from the coincidence detector to the printer light valve control unit. The light valves are preset with the information obtained from a punched paper tape in accordance with the predetermined preferred light level and the hue for the scene to be printed. The frame count cuer includes a presettable cue advance unit to advance the cue signal by a predetermined number of frames to accommodate the inherent reaction time of the printer light valves. The entire frame count cuer is photon coupled to the photographic film printer to prevent inadvertent "noise" from being transferred to the cuer.
REFERENCES:
patent: 3299272 (1967-01-01), Furukawa et al.
patent: 3299272 (1967-01-01), Furukawa et al.
patent: 3476477 (1969-11-01), Balint
patent: 3586438 (1971-06-01), Gyori
patent: 3716299 (1973-02-01), Balint
The Optoelectronics Data Book for Design Engineers; Texas Instr. Inc.; pp. 145-149.
Bell & Howell Company
Fitz-Gerald Roger M.
Gellner M. L.
Hix L. T,.
Hoffman John
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