| 摘要 |
PROBLEM TO BE SOLVED: To perform correction from a second optical system and highly accurately detect the attitude of an excavator even in a case where the azimuth of the excavator is changed and the light receiving position of laser light is dislocated. SOLUTION: The excavation azimuth detector detects the azimuth of a light receiver 11 by making azimuth reference of laser light 15 by detecting an incident angle on the main lens system of the laser light 15 emitted on the basis of a displacement amount of the light receiving position of the laser light 15 in a one-dimensional position detection element by a main lens 16 condensing the beam-like laser light 15 irradiated in the prescribed direction from a prescribed point and the light receiver 11 having the one-dimensional position detection element disposed in the neighborhood of a light condensed point of the main lens system 16. In this case, a second optical system introducing the laser light 15 incident on the main lens system 16 is disposed between the main lens system 16 and the one-dimensional position detection element. The second optical system may be constituted of the light condensing system of an anamorphic optical system, a mirror having prescribed curvature or a polygon mirror. |
