Patent ID: 7508522

Claim:
A reflected light measuring apparatus comprising: an illumination system which projects measuring light onto a measuring area of an object to be measured; and a light receiving system which receives reflected light from the measuring area illuminated with the measuring light projected from the illumination system, wherein, the illumination system includes a first illumination system which projects the measuring light from a direction whose angle to a normal to the measuring area of the object to be measured is relatively small and a second illumination system which projects the measuring light from a direction whose angle to the normal to the measuring area of the object to be measured is relatively large, and wherein, the first illumination system is configured to be able to project the measuring light with a prescribed angular width onto each point in the measuring area of the object to be measured, and the first illumination system and the light receiving system are configured to project the measuring light onto the measuring area and receive the reflected light from the measuring area, respectively, via a telecentric optical system.