Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Reexamination Certificate
2008-01-29
2008-01-29
Monbleau, Davienne (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
C250S2140RC, C250S208100, C382S162000, C382S167000
Reexamination Certificate
active
07323676
ABSTRACT:
The invention relates to a color photosensor for sensing the color contents of incident light. In order to provide a color photosensor which is cheap to produce and which allows the control of light in as well intensity as color a color photosensor is proposed comprising: a sensing unit (2) divided into four sensing areas (21, 22, 23, 24) each sensing the color content of incident light and outputting a sensing current, a filter unit (3) comprising four filter elements (31, 32, 33, 34) each being assigned and adapted to one of said sensing areas, said filter elements comprising a cyan colored filter element, a yellow colored filter element and a magenta colored filter element, and a subtraction unit (4) for separately subtracting each of the three sensing currents outputted from the three sensing areas to which one of said colored filter elements is assigned, from the forth sensing current obtaining color signals proportional to the red, green and blue content of said incident light.
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Lumileds Lighting US, LLC.
Monbleau Davienne
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