ANNULAR BEAM LASER TREATMENT APPARATUS Russian patent published in 1996 - IPC

FIELD: welding of electronic equipment products, thermal strengthening of processing tools, punching of openings. SUBSTANCE: apparatus has laser device, telescopic system with negative and positive lenses, rotary interference mirror, optical focusing system, protective plate and visual observation axial system. Conical lens is positioned behind constriction zone in spaced relation with respect to telescopic system. Conical surfaces of bases of first and second lenses are positioned at angles selected in predetermined ratio. It allows continuously variable changing of diameters of working contours to be provided during displacement of first conical lens along optical axis. EFFECT: increased efficiency and wider operational capabilities. 3 dwg