| 摘要 |
PURPOSE:To enable high-speed color decision processing under a fluorescent lamp as factory lighting, by arranging an optical filter, a main light receiving element, a sub light receiving element, an integrator, an analog divider and the like. CONSTITUTION:This sensor is provided with optical filters R', G' and B' having peaks at wavelengths of red, green and blue, main photo detectors SR, SG and SB for receiving light individually as passing therethrough and a sub photo detector SC having sensitivity to visible light. Then, when the photo detectors face an object the color thereof is to be judged under a factory lighting such as fluorescent lamp, a trigger pulse is generated as synchronizing the peak of brightness of a fluorescent lamp for lighting based on an output of the element SC. With each generation of the pulse, outputs from the elements SR, SG and SB are smoothed by integrators IR, IG and IS and added up with an adder ADD. Analog dividers DR, DG and DB obtain a ratio between outputs and the addition sum thereof to be outputted as color decision item for a computer. The processing speed of the present divider is about 10muS, accordingly it is sufficient enough to cope with the flickering caused by a fluorescent lamp.
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