摘要 |
PURPOSE:To obtain a horizontal and a vertical projection beam from a single laser beam source by using a sectorial laser beam irradiating device which projects the horizontal projection beam and an optical system which irradiates the center line of a leveling base with light transmitted through a reflecting surface. CONSTITUTION:The laser beam 12 from the laser light generation source 11 is incident on an incomplete reflecting mirror 13; the majority of its energy becomes reflected light 14 and the majority of its energy becomes reflected light 25 through a reflection mirror 23 and an incomplete reflection mirror 24. The reflected light 25 is converged on a body to be measured through a concave lens 30, reflection mirror 31, and convex lens 32. A cylindrical reflector 33 in front of this lens 32 irradiate a sectorial laser beam horizontally. The transmitted light 15 of the incomplete reflection mirror 13 as the remainder, on the other hand, is re-reflected by the incomplete reflection mirror 13 from a reflection mirror 16 and reflected by reflection mirrors 17-20 to become a vertical irradiation laser beam 22 from a through hole 21. Further, the transmitted light of the incomplete reflection mirror 24 as the remainder is reflected by a reflection mirror 26 and then becomes a vertical irradiation laser beam 28 through a through hole 27. |