H - Electricity – 04 – N
Patent
H - Electricity
04
N
350/40, 315/73
H04N 5/38 (2006.01) H05B 39/04 (2006.01)
Patent
CA 1235795
-22- AUTOMATIC LIGHT CONTROL SYSTEM Abstract of the Disclosure A system is disclosed for automatically con- trolling the light intensity of a light source as a function of the amount of light received by a photo- sensor. 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 pro- portional to the amount of light reflected thereon. A first means is responsive to the reception of the video signal over a preselected period of time for providing a first signal which is proportional to the amount of reflected light received by the photosensor over that preselected period of time. A second means is respon- sive to the first signal for generating 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.
439003
Chahal Maninderpal S.
Therrien Roger H.
Ncr Canada Ltd - Ncr Canada Ltee
Ncr Canada Ltd. - Ncr Canada Ltee
LandOfFree
Automatic light control system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Automatic light control system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Automatic light control system will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-1275292