Patent ID: 6445446
Filing Date: 2002-09-03
Classification: G01C,G01S

Abstract:
A surveying instrument, comprising:a collimating optical system for collimating the surveying instrument with respect to an object; a light emitter for emitting tracking light; a projecting optical system for projecting said tracking light from said collimating optical system toward said object; a splitting optical device for splitting tracking light reflected by said object and incident via said collimating optical system; first and second light receiving devices; a first condensing device optically arranged between said splitting optical device and said first light receiving device for condensing tracking light in a first transverse direction; and a second condensing device optically arranged between said splitting optical device and said second light receiving device for condensing tracking light in a second transverse direction, optically perpendicular to said first transverse direction; wherein said first and second light receiving devices are arranged to receive light along first and second lines corresponding to said condensed tracking light from said first and second condensing devices.