Optics: measuring and testing – By shade or color – Trichromatic examination
Patent
1999-06-22
2000-09-26
Evans, F. L.
Optics: measuring and testing
By shade or color
Trichromatic examination
356407, 356425, 250226, G01J 351
Patent
active
06124936&
ABSTRACT:
A color discrimination system which emits light from a light source to a measurement target, receives the light reflected from the measurement target or the light penetrating the measurement target by a light reception section for receiving the light for each of a plurality of light wavelengths, finding the sum total of the light reception quantities of the wavelengths and the ratios of the light reception quantities of the wavelengths to the sum total by an operation section, compares the values with reference values provided for a detection object, and discriminates color of the measurement target from color of the detection object based on the comparison result. The quantity of the light received by the light reception section for the detection object is sampled and the reference values are set to appropriate values, for example, in the range of the maximum value and the minimum value based on the sum total of the light reception quantities of the wavelengths and the ratios of the light reception quantities of the wavelengths to the sum total found by the operation section, whereby the optimum reference values responsive to the detection state and the detection environment can be set easily.
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Evans F. L.
Keyence Corporation
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