SURVEYING DEVICE WITH A COAXIAL BEAM DEFLECTION ELEMENT

The invention relates to surveying device (1) such as a total station, multi station or theodolite, with a targeting unit (2) carried by a support (3), the targeting unit (2) being arranged rotatable relative to a vertical axis (v) and a tilt axis (t) as a first and a second axis of rotation (Rv, Rt), for emitting a distance measurement beam (B, B1, B2) in an emission direction into free space, the emission direction being variable with respect to the vertical axis (v) and the tilt axis (t). The instrument (1) further comprises a beam deflection element (6) such as a partially transparent rotatable mirror, situated in the targeting unit (2) and being rotatable about a deflection axis (d) as a third axis of rotation (Rd). The deflection axis is (d) congruent to the tilt axis (t) and the beam deflection element (6) is arranged in such a way in the distance measurement beam path that the emission direction can be varied with respect to the deflection axis (d).