| 摘要 |
PROBLEM TO BE SOLVED: To provide a photometric device for use in a simple-structured spectrophotometer or the like that readily permits downsizing.SOLUTION: The spectral reflectance of the surface of a measurement object is measured by condensing light from a light source, irradiating the surface of the measurement object with the condensed light, and guiding the light reflected on the surface to an optical sensor. A lens for condensing the light from the light source is arranged on the path of the light from the light source, and a cavity to let the light pass is bored in the lens. The light reflected on the surface of the measurement object reaches the optical sensor via the cavity in the lens, and the spectral reflectance of the surface of the measurement object is measured on the basis of a detection signal from the optical sensor. |
