| 摘要 |
PROBLEM TO BE SOLVED: To provide a crane lighting device which enables safe night work.SOLUTION: A crane lighting device calculates an optical axis 12S of a camera 12 according to postures of a crane 1 and the camera 12. The crane lighting device calculates an optical axis 13S of a searchlight 13 according to postures of the crane 1 and the searchlight 13. Subsequently, the crane lighting device controls the inclination of the searchlight 13 so that the optical axis 13S of the searchlight 13 is arranged parallel with the optical axis 12S of the camera 12. |
