| 摘要 |
There are provided a rotary laser projecting device 1 and an object reflector 9, said rotary laser projecting device 1 comprises a reference plane forming unit 3 for forming a reference plane by projecting fan-shaped laser beams 5 which spread in vertical direction and have two or more laser beams including at least one thereof tilted, a distance measuring unit 4 for measuring distance by projecting distance measuring light 6, a rotator 10 for projecting said fan-shaped laser beams and said distance measuring light in horizontal direction by rotary irradiation, a horizontal angle detecting unit 21 for detecting horizontal angle of the rotator, a photodetection unit for receiving the reflected fan-shaped laser beams 5' and the reflected distance measuring light 6', a storage unit 13, and a control arithmetic unit 12 for controlling said reference plane forming unit, said distance measuring unit and said rotator, and said object reflector 9 reflects said fan-shaped laser beams and said distance measuring light toward said rotary laser projecting device, wherein said control arithmetic unit measures elevation angle of said object reflector from time difference of photodetection between said two or more laser beams, measures horizontal angle of the object to be measured based on the result of detection of said horizontal angle detecting unit when at least one of said reflected fan-shaped laser beams and said reflected distance measuring light is received and said distance measuring unit measures a distance to the object to be measured.
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