OBSERVATION SYSTEM FOR INSPECTING SMALL DIAMETER HOLES

摘要

A picture image observation system comprising a plural number of optical fibers (201) bundled in alignment is adapted to observe dangerous and/or inaccessible locations such as an inner surface of a narrow hole or a long pipe path or places too dangerous for workers has one end (203) thereof approachable to anywhere required by providing such auxiliary devices as a zooming device to vary the focal length of an image forming lens, a traveling device for moving back and forth in a pipe, a lens protection device, an illumination light scanning device (206) and/or an observation direction switching device (208) to switch the observation direction to either frontal (205) or side (204) directions and by operating auxiliary devices (209, 210, 211, 216) on the other end of the system by means of wire cables or other remote control means i.e. fluid pressure or electric means.