TUBE INTERNAL SURFACE INSPECTOR

摘要

PURPOSE:To enable prevention of halation and clear photographing of a defect by forming a recess at the center of a contact surface with a reflecting mirror of a transparent glass body. CONSTITUTION:A prism 30 is a cylinder body with the diameter almost the same as that of a bore scope 2 and mounted with one end thereof tight at the tip of the bore scope 2 while the other end thereof is formed into a conical concave surface 30a. A recess 31 with a curved surface is formed at the center of the concave surface 30a. The concave surface 30a is finished to be a reflecting mirror 32 made up of a silver film leaving a rim and the recess parts 31. The recess 31 is made as a bore surface properly roughed. With such an arrangement, light of a lighting section 8a of a light guide 8 of the bore scope 2 is transmitted through the prism 30 to be reflected 32 lighting the entire internal surface of a tube 1 while an entire circumference image thereof is reflected 32 to reach a image collection lens 7 and caught with a TV camera through an image transmission path 6. In this case, light is scattered in reflection by the recess 31 with a properly roughed surface at the center of the concave surface 30a thereby eliminating halation.