Patent ID: 7515256

Claim:
A position measuring instrument that irradiates a reflector with a measuring light to determine the distance to the reflector on the basis of the reflected light, comprising: a rotating unit comprising a rotating mirror and means for expanding the measuring light in a fan-shaped manner, wherein said fan-shaped manner expanding in an angular height direction relative to a horizontal plane; a fixed unit comprising a distance-detection light emitting unit which has the same visual field as that of the fan-shaped manner; a distance-detection light receiving unit; and an angle detector detecting the horizontal angle position of the rotating mirror, whereby the measuring light of fan-shape is guided from the fixed unit via the rotating mirror horizontally to the reflector and the measuring light reflected by the reflector is guided via the rotary mirror back to the fixed unit, further characterized by a horizontal angle and height angle detecting unit comprising a detection light emitting unit and an imaging unit and by a transmitter for transmitting image data from the imaging unit associated with position data of the reflector to a receiving unit of a photoreceiver comprising the reflector, wherein said measuring light includes collimation light; said light receiving unit has a collimation-use light receiving sensor for receiving the collimation light; and said collimation-use light receiving sensor detects a collimation center and deviation of the reflector by the reflected light.