Patent ID: 6781675
Filing Date: 2004-08-24
Classification: G01S

Abstract:
An electro-optical distance measuring system for large measurement ranges having a para-axial arrangement of a beam source (2) with an associated transmitting optics (3) and a beam receiver, configured as at least one small-area photodiode (4), with an associated receiving optics (5), including a means for signal extension for a lower distance measurement range for distances (X); wherein the small-area photodiode (4) features an active surface in the equivalent diameter of less than 100 &mgr;m; wherein the beam source (2), the transmitting optics (3), the small-area photodiode (4) and the receiving optics(5) are each oriented with their optical axes (A1, A2) parallel to a measurement light beam (6) and the measurement light beam (6) is directed from the transmitting optics (3) to the measurement object and to the receiving optics and wherein the beam source (2) and the small-area photodiode (4) are rigidly connected with each other by at least one rigidly connected circuit board (8, 8a, 8b), such that at least the small-area photodiode (4) is electrically conductible and temporarily adjustable in a position (9, 9â€²) at least using electrical contacts (10) and is fixed directly in the adjusted position (9, 9â€²) on the circuit board (8, 8a, 8b), wherein the small-area photodiode (4) is configured as a large-area photodiode with a mask (13) having at least one aperture opening, said mask limiting shielding the active surface.