Patent ID: 9429472
Filing Date: 2016-08-30
CPC Classification: G01J

Claim Text:
1. An illumination device comprising: a light source configured to emit light, having a reference axis, and having light distribution in which the reference axis serves as an axis of symmetry or light distribution in which a plane including the reference axis serves as a plane of symmetry, the light including a first light beam and a second light beam, a traveling direction of the first light beam making a first angle with the reference axis, a traveling direction of the second light beam making a second angle with the reference axis, and the second angle being the same as the first angle; a photodetector configured to detect intensity of the second light beam; and a support structure configured to support the light source and the photodetector in positions and postures that allow the first light beam to be guided to an object to be illuminated, and the second light beam to be guided to the photodetector.