Importance

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Abstract

A surveying instrument, which comprises an object to be irradiated, a projection system provided on a range finder or on a range finding angle measuring instrument having a range finder and for emitting a laser beam toward the object, driving means for driving a laser emitting source of the projection system, and control means for controlling emitting condition of the laser beam via the driving means based on a distance data from the range finder to the object to be irradiated, whereby, in case there is a deviation between the preset distance and a distance measured by the range finder, the control means changes irradiation intensity of the laser beam, or in case there is a deviation between the preset distance and a distance measured by the range finder, the control means changes irradiation intensity of the laser beam and also changes time interval of the intensity changes according to extent of the deviation, and position information and instruction are transmitted to the object to be irradiated side using the laser beam as an information transmitting medium to facilitate positioning of the object to be irradiated.

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First Claim