公开(公告)号：US5784155A

公开(公告)日：1998-07-21

申请号：US598322

申请日：1996-02-08

申请人： Fumio Ohtomo ,  Satoshi Hirano ,  Richard W. Davidson

发明人： Fumio Ohtomo ,  Satoshi Hirano ,  Richard W. Davidson

IPC分类号： G01C15/00 ,  G01B11/26 ,  G01C1/00 ,  G01C3/08

CPC分类号： G01C15/004 ,  G01S17/06 ,  G01S17/74

摘要： A laser survey instrument, which comprises at least a main unit for emitting a laser beam and an object reflector for reflecting the laser beam from the main unit toward the main unit, whereby said main unit comprises an emitter for emitting the laser beam, a rotating unit for rotating and scanning the laser beam, a tilting mechanism for tilting the laser beam at an arbitrary angle at least in one direction with respect to a horizontal plane, a rotating angle detector interlocked with the rotating unit and for detecting irradiating direction of the laser beam, a reflection light detector for detecting reflection light from the object reflector, and an alignment display unit for detecting a deviation of direction with respect to the object reflector and a deviation of tilt angle based on a signal from the reflection light detector and for obtaining information on the deviation of direction or the tilt angle, the laser beam emitted from the main unit is irradiated to scan, the center of the object reflector is determined based on the laser beam reflected from the object reflector during scanning process, information on a deviation of direction of the main unit and a deviation of tilt angle is displayed, or direction and tilt angle of the main unit are corrected automatically based on the deviation of direction thus obtained or on the deviation of tilt angle thus obtained.