Device for controlling object movement along target line uses two mirror systems for rotation of laser beam about target line for detection by reception device carried by moving object

摘要

The device has a laser beam rotated about an axis provided by the target line (11), with detection of the laser radiation by a reception device carried by the moving object, for providing a control signal. The rotation of the laser beam is effected via 2 mirror systems (60,61) coaxial to the target line, the first mirror system having an annular polygonal mirror with a number of reflective surfaces on its inside, enclosing the second mirror system, both mirror systems rotated about the same axis. The second mirror system has 2 relatively angled reflective surfaces (63,64) for reflection of the laser beam (2) onto the first mirror system and for reflection of the laser beam reflected by the first mirror system in the direction of the target line.