Surveying Instrument

Abstract

A surveying instrument comprises a distance measuring light projecting module (23) having a light emitter (28) which projects a distance measuring light (35) to an object, a distance measuring light receiving module (24) having a photodetector (39) which receives a reflected distance measuring light (49) from the object, a tracking light projecting module (25) having a tracking light emitter (53) which projects a tracking light (36) coaxially with the distance measuring light to the object, a tracking light receiving module (26) having a tracking photodetector which receives a reflected tracking light (51) from the object coaxially with the reflected distance measuring light, and an arithmetic control module which controls the distance measuring light projecting module and the tracking light projecting module, calculates a distance to the object based on a light receiving result of the reflected distance measuring light with respect to the photodetector, and calculates a position deviation between the object and a center of the tracking photodetector based on a light receiving position of the reflected tracking light with respect to the tracking photodetector, wherein the distance measuring light receiving module and the tracking light receiving module each have a light receiving prism, and the light receiving prism is configured to internally reflect the reflected tracking light three times.

Dependencies are inferred from the claim text.