Patent ID: 8462406

Claim:
A spectral colorimetric apparatus for detecting a color of an image of a test subject, the spectral colorimetric apparatus comprising: an illumination optical system that illuminates the test subject located on a detection surface; a spectral optical system including a spectral element that spectrally separates a light beam diffused by the test subject and a light receiving element array that detects a spectral intensity distribution of the light beam spectrally separated by the spectral element; and a guiding optical system that guides a light beam diffused by the test subject to the spectral optical system, wherein a plane, including a principal ray of a light beam incident on the spectral optical system and a principal ray of a light beam having been spectrally separated by the spectral element, is defined as a spectral plane, wherein the detection surface and the spectral plane are parallel to each other, and wherein a light receiving surface of the light receiving element array and the spectral plane are orthogonal to each other.