Photocopying – Projection printing and copying cameras – Illumination systems or details
Patent
1982-10-15
1986-10-21
Lev, Robert G.
Photocopying
Projection printing and copying cameras
Illumination systems or details
358213, G03B 2778
Patent
active
046182543
ABSTRACT:
A system is disclosed for automatically controlling the light intensity of a light source as a function of the amount of light received by a photosensor. In a preferred embodiment the light source illuminates a reference background which, in turn, reflects the light incident thereon to a photosensor in a video camera. In response to this reflected light, the photosensor produces a video signal which is proportional to the amount of light reflected thereon. A first processor is responsive to the reception of the video signal over a preselected period of time and provides a first signal which is proportional to the amount of reflected light received by the photosensor over that preselected period of time. A second processor is responsive to the first signal and generater a control signal to automatically cause an adjustable power supply to change the voltage applied to the light source as a function of the amplitude of the control signal. The second processor is also controlled by a sensor signal initiated by the presence of the object to be copied.
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D. A. Van Hook, "Uniform Illumination Control for Flourescent Lamps" IBM Tech. Dis. Bul., vol. 24, No. 3, Aug. 81, pp. 1650-1651.
Chahal Maninderpal S.
Therrien Roger H.
Hawk Jr. Wilbert
Lavin Richard W.
Lev Robert G.
NCR Canada Ltd
Sessler Jr. Albert L.
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