Laser beam emitting apparatus

Details Laser beam emitting apparatus Laser beam emitting apparatus

1999-03-11

2000-08-22

Font, Frank G.

Optics: measuring and testing

Angle measuring or angular axial alignment

3561391, G01B 1126

Patent

active

061080756

ABSTRACT:
The present invention provides a rotary laser beam emitting apparatus capable of being inclined in a direction coinciding with the direction of a reflector. A light emitting unit emits a laser beam, a rotary laser beam projecting unit projects and turns the laser beam emitted by the light emitting unit in a plane, a first photodetector receives at least part of the laser beam projected by the rotary laser beam projecting unit from a predetermined direction, a second photodetector detects a reflected laser beam reflected from a reflector, and a data processing means determines an error in the direction of a main body relative to the reflector on the basis of detection signals provided by the first and the second photodetector.

REFERENCES:
patent: 4895440 (1990-01-01), Cain et al.
patent: 5784155 (1998-07-01), Ohtomo et al.
patent: 5867263 (1999-02-01), Ohtomo et al.

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