| 摘要 |
PURPOSE: To perform spectral analysis of reflected light by illuminating a measuring spot on a measuring surface through an optical illumination means. CONSTITUTION: A photographic data measuring apparatus comprises an optical means 115 for illuminating a measuring surface with a measuring spot 57, a spherical ring mirror 135, a flat ring mirror 138 provided on a glass ring 137, and an optical measuring means. A rotary symmetric aspherical mirror 120 associated with a light source is provided a ring groove 121 having cross-section of a part of an ellipse 127 on the side facing the light source. First focal point 124 of the ellipse 127 is matched with the position of the light source on the rotary symmetric axis on the outside of an aspherical mirror 120. A second focal point 125 is shifted laterally from the rotary symmetric axis of the aspherical mirror 120 and located in a ring diaphragm 126 surrounded by the spherical ring mirror 135. A measuring light reflected on the measuring spot 57 is passed, with appropriate accuracy and intensity, through a grid monochromater and subjected to spectral analysis.
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