Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1985-08-01
1987-10-13
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
378 99, 378207, H04N 532, G01D 1800
Patent
active
047000589
ABSTRACT:
An imaging system for generating a image on film from video image data incorporates feedback control techniques to provide control of film density. The system includes variable gain amplifiers responsive to light intensity output of a film writing device for maintaining the output at a desired set level. In addition, the system includes apparatus and a method for monitoring the density of film images produced by the system and for utilizing the monitored values to modify the system transfer function in a direction to effect a change in the film density towards a desired value.
REFERENCES:
patent: 3400632 (1968-09-01), Wahli
patent: 4172659 (1979-10-01), Laska
Belanger Barry F.
Lambert Thomas W.
Liu Thomas P. L.
Beusse James H.
General Electric Company
Stoner Douglas E.
Westin Edward P.
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