INSPECTION LIGHT IRRADIATING METHOD AND APPARATUS, AND LED MOUNTING SEAT

摘要

PROBLEM TO BE SOLVED: To provide an inspection light irradiating method and an inspection light irradiating apparatus for optimally inspecting an internal face of a cylindrical tube such as a metal cylindrical vessel opening at one end and occluded by an uneven bottom plate at the other end.

SOLUTION: An optical axis L of an inspection light is inclined at a predetermined angle to a central axis C of the cylindrical tube 4 laterally viewed, and configured to have an angle at which the optical axis L does not pass through the central axis C viewed in the plane direction. The inspection light L enters an opening of the cylindrical tube 4 and spirally travels toward the bottom plate as the inspection light L is reflected by an inner side face of the cylindrical tube 4 several times.

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