JPS6465409A - Gradient adjusting device for laser gradient collimator - Google Patents

Abstract

PURPOSE:To perform processing for dust-protective and waterproof structure and optical axis adjustment and to improve the stability, etc., of an optical axis by providing two wedgelike prisms which are equal in wedge angle on the optical axis of the beam expander of the collimator. CONSTITUTION:When the two wedgelike prisms 10 and 11 which are put on the beam expander optical axis of the laser collimator and equal in wedge angle are driven to rotate in the opposite directions by an equal angle, light beams passed through both prisms 10 and 11 are deflected to the beam expander optical axis in a plane perpendicular to a reference slanting surface corresponding to the angle of the rotation and the collimation angle can be corrected to a proper direction. At the same time, a slanting sensor table 18 slants by the same angle as the deflection angle of the beam light through the rotation of a cam member 16 which is associated with the rotation of the prisms and an inclination sensor 19 can measures a correction angle. It is not necessary to slant a laser tube and a beam expander lens barrel 2 together or the lens barrel 2 itself, the optical axis of the collimator is adjusted and the stability of the optical axis can be improved.