| 摘要 |
PURPOSE:To perfectly prevent chilling and to obtain a hardened layer of a sufficient depth by projecting laser beams having a nearly elliptical cross-section on a body to be treated and by scanning the laser beams in the direction of the major axis of the ellipse. CONSTITUTION:Laser beams 10 having a circular cross-section from a laser beam generator are refracted by the 1st concave reflecting mirror 12 and reach the 2nd reflecting mirror 14. The laser beams refracted and converged by the mirror 14 are projected on a body 18 to be treated though a projection head 16. The projected laser beams have a nearly elliptical cross-section. The head 16 or the body 18 is then moved in the direction of the major axis of the ellipse to scan the laser beams on the surface of the body 18.
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