Patent ID: 7382444

Claim:
Electronic distance measuring apparatus for surveying, e.g. for measuring the distance from the apparatus to an object comprising: a) an objective lens defining an optical axis (OA), b) at least two sources of structured light for transmitting beams (λ 1 ,λ 2 ) of separate wavelengths towards said object, said beams on reflection from said object received by the objective lens, (c) at least two receivers arranged outside a beam path as defined by the objective lens, and adapted to receive said received beams (λ 1 ,λ 2 ) of structured light, whereat optical means comprising at least two dichroic surfaces are each arranged at a tilt angle (α 1 , α 2 ) with respect to said axis (OA), said optical axis (OA) passing through said surfaces, at least one of said dichroic surfaces arranged on a plate, said at least two dichroic surfaces adapted to reflect at least one of said received structured light beams (λ 1 ,λ 2 ), respectively, towards said receivers.