Apparatus for inspecting an inner surface of a pipe including means for preventing halation

摘要

In a pipe inner-surface inspecting apparatus, a body is inserted into an interior of the pipe and has an illuminator mounted at a forward end of the body for emitting light forwardly from the forward end of the body. A reflecting mirror in the form of a conical surface is so arranged as to face toward the forward end of the body with a space left between the reflecting mirror and the forward end of the body. The reflecting mirror diverges away from the forward end of the body, and reflects the light from the illuminator to illuminate the inner surface of the pipe thereby forming an image thereof. A concentrating unit is arranged at the forward end of the body for concentrating the image of the inner surface of the pipe, which is reflected by the reflecting mirror, to transmit the image to a rearward end of the body. A transparent glass is interposed between the reflecting mirror and the forward end of the body. The transparent glass has a surface in close contact with the reflecting mirror, which has a central region formed with a recess.