G - Physics – 01 – J
Patent
G - Physics
01
J
350/42, 73/56
G01J 5/60 (2006.01) G01J 5/32 (2006.01) H04N 9/73 (2006.01)
Patent
CA 1150824
ABSTRACT OF THE DISCLOSURE Apparatus for detecting the color temperature of a source of light including first and second semiconductor photo-sensing elements are connected in series and are oppositely poled with respect to each other. Light of predetermined colors having different spectral characteristics is supplied to the first and second photo-sensing elements. An output signal is derived from the opposite ends of the series circuit representing the color temperature of the light source. In a preferred embodiment, the output signal is produced by an operational amplifier having inputs, connected to one end of the series circuit, an output con- nected to the opposite end of the series circuit, and a resistance connected between the two inputs of the operational amplifier. In one application, the output voltage is supplied to a differential amplifier which, in turn, provides first and second voltages representing the relative intensities of the light received by the photo-sensing elements. The difference between these first and second voltages is combined with first and second color video signal components, respectively, such as color difference signals, so as to vary the levels of these respective color video signal components. The differential amplifier has a single output for providing a white-balanced red or blue color signal voltage.
323392
Gowling Lafleur Henderson Llp
Sony Corporation
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