| 摘要 |
An optical scope for viewing a feature at an inaccessible location is disclosed. The scope (10) consists of a tube (11) having a distal end which is insertable in use into an inaccessible location and a proximal end connected to a housing (30). The tube contains an optical system (23, 31) for gathering an image of a feature and relaying the image to a viewing means. The tube also contains means (34) to direct a laser beam to a first reference point in the distal end; a first reflector (17) mounted in the distal end for rotation about the first reference point and being operable to change the direction of the laser beam so as to direct the beam out of the scope to a target feature; a second reflector (15) mounted in the distal end for rotation about a second reference point and being operable to change the direction of a reference axis intersecting the second reference point so as to cause the axis to intersect the laser beam at a target feature. Finally, the scope (10) includes control means (37, 40) actuable at the proximal end of the scope to rotate the first and second reflectors about the first and second reference points, position sensing means (43) to detect movement of the first and second reflectors and antibacklash means (44, 45, 46) associated with the control means.
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