| 摘要 |
#CMT# #/CMT# The device has an arrangement of fixed convergent lenses (L1, L3) and a movable divergent lens (L2), where the divergent lens is movable for modifying magnification of image in a work plane without changing a distance between a laser source (S) and a position of the work plane. The convergent lenses of identical focal distance constitute an afocal assembly, and the movable divergent lens is placed between the lenses. The focal distances of the lenses are chosen such that desired range of magnification of the image is covered when the lens (L2) is moved between the lenses (L1, L3). #CMT#USE : #/CMT# Device for focusing a laser source i.e. laser beam, mounted on a brazing head and used for fixing an electronic component on a printed circuit, and for being used in a laser beam welding device (claimed) such as welding robot. #CMT#ADVANTAGE : #/CMT# The divergent lens is movable for modifying magnification of image in the work plane without changing the distance between the laser source and the position of the work plane, such that a camera visualizes the focusing point. The afocal assembly has fixed magnification, such that stability with respect to small variations of distance is improved. #CMT#DESCRIPTION OF DRAWINGS : #/CMT# The drawing shows a schematic view of an arrangement of lenses of a laser beam focusing device.'(Drawing includes non-English language text)' L1, L3 : Fixed convergent lenses L2 : Movable divergent lens P : Work plane S : Laser source. |
