| 摘要 |
PROBLEM TO BE SOLVED: To synthesize spectral sensitivity which is closely related to desired spectral sensitivity characteristics with high precision by small-scale circuitry with a high S/N in a colorimeter which separates light to be measured into a plurality of wavelength components by wavelength separation means, receives them by a plurality of light receiving means, respectively, and determines a signal with spectral sensitivity closely related to the desired spectral sensitivity characteristics. SOLUTION: Output currents I0 to I30 from pixel sensors P0 to P30 are subjected to A/D conversion and become capable of being retrieved at arbitrary rates by shunt circuits SP0 to SP30 without multiplying by a weighting factor corresponding to a two-degree field of view color-matching function of CIE. The shunt rates are set corresponding to the color-matching function by an arithmetic control circuit 5 through D/A and MX1. The shunt currents are integrated by integrating circuits Sx, Sy, Sy corresponding to the color-matching function, synthesize signals Vx, Vy, Vz corresponding to tristimulus values, and are subjected to digital conversion by ADx, ADy, ADz. Multiplying by the weighting factor is thus performed at the analog signal stage. COPYRIGHT: (C)2006,JPO&NCIPI
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