LIGHTING DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a compact lighting device that can light up a camera in order to separately light up the camera with light in parallel with a camera axis and a tilted light for sharp recognition of a base mark. SOLUTION: A prism ring is provided in duplicate around an optical axis of the camera in the middle. The 1st prism ring placed inside for collimating a light received horizontally from a light source in parallel with the camera optical axis and the 2nd prism ring placed outside for tilting the light received horizontally from the light source with respect to the camera optical axis can realize the compact lighting device with high versatility.