| 摘要 |
A stimulus values direct reading colorimetric instrument comprising a plurality of photoelectric sensors having different spectral responsivities equal or approximately equal to color matching functions +E,ovs X+EE ( lambda ), +E,ovs Y+EE ( lambda ), and +E,ovs Z+EE ( lambda ); and measuring and display device to measure and display the tri-stimulus values X,Y and Z and the chromaticity of the light to be measured by computing the photoelectric sensor output signals caused by the light, wherein the instrument calculates the stimulus values corresponding to the tri-stimulus values and measures the chomaticity by providing at least one corrective photoelectric sensors so as to maximize their spectral responsivities in the vicinity of the transmission threshold wavelengths of each sensor and taking the sum of the output signals from the sensors and the corrective sensor after multiplying each coefficient assigned to the signals by each output signal, respectively.
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