Importance

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Abstract

The invention provides a surveying instrument, which comprises a protractor table installed via an installation base and capable of detecting a lateral rotation angle and a surveying instrument main unit mounted on the protractor table via supporting mechanisms capable of rotating longitudinally, wherein the supporting mechanisms enables the surveying instrument main unit to set in a predetermined angle condition with respect to the protractor table, wherein the surveying instrument main unit comprises a distance measuring unit which has a light emitting element for emitting a distance measuring light, a distance measuring light projecting unit for projecting the distance measuring light, a light receiving unit for receiving a reflected distance measuring light and a photodetector for receiving the reflected distance measuring light and for producing a light receiving signal, and the distance measuring unit performs a distance measurement of an object to be measured based on the light receiving signal from the photodetector, a control unit for controlling a distance measuring operation, an optical axis deflecting unit, which is provided on an optical axis of the distance measuring light projecting unit and on an optical axis of the light receiving unit, for controlling a deflection of the both optical axes and an attitude detecting unit which has a tilt detecting unit for detecting a horizontal and mechanisms for tilting the tilt detecting unit so that the tilt detecting unit is maintained horizontally, and is configured to detect a tilting amount of the surveying instrument main unit.

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First Claim