LIGHTING SYSTEM FOR INSPECTING FLAW

摘要

PROBLEM TO BE SOLVED: To provide a lighting system for inspecting flaws wherein a surface of a material to be inspected is evenly irradiated and flaws can be detected with a high detecting performance. SOLUTION: A plurality of optical fibers 26 comprises plural optical fiber bundles 22 which are aligned in a vertical direction with respect to an optical axis of the optical fibers 26. The system includes an optical fiber unit 21 connected so that the optical fiber bundles may line up along such alignment direction, and a light-gathering unit 40 connected so that a plurality of condenser lenses 42 comprising cylindrical lenses may form a line along the alignment direction of the optical fibers 26. The light-gathering unit 40 is placed at a light emitting side of the optical fiber unit 21 so that a connecting portion of the condenser lenses 42 may deviate in the alignment direction of the optical fibers 26 with respect to a connecting portion of the optical fiber bundles 22.