Patent ID: 7369239

Claim:
A light measuring apparatus, comprising: a spectral device for dispersing measurement light at each of specified wavelengths; a predetermined number of photoelectrical converters for receiving the dispersed measurement light and outputting light reception signals corresponding to the predetermined number of wavelengths; a storage device for storing the predetermined number of weight coefficients set beforehand to obtain a specified spectral responsitivity in accordance with the light reception signals outputted from the respective photoelectrical converters; and a calculator for calculating characteristics of the measurement light based on the specified spectral responsitivity using the respective light reception signals and the respective weight coefficients, wherein the spectral responsitivities and wavelength pitch of the respective photoelectrical converters are so determined as to satisfy the following conditions (1), (2): (1) B≧5 nm, (2) A/B=1.5 to 4.0. wherein A denotes a half power band width of the spectral responsitivities of the respective photoelectrical converters and B denotes a center wavelength interval of the spectral responsitivities of the respective photoelectrical converters.