| 摘要 |
PROBLEM TO BE SOLVED: To facilitate survey work and accurately measure distance, area, etc. SOLUTION: In this device 1, a convex first reflector 5 reflecting at least a part of light received from a light casting side at an arbitrary angle toward the light casting side and a flat second reflector 8 having directivity in reflecting the light received from the light casting side to a specific direction, capability of rotating around a vertical axis and of variation of angle of elevation to a horizontal axis are arranged at an upper part and a lower part.
|
