B - Operations – Transporting – 23 – K
Patent
B - Operations, Transporting
23
K
334/22, 327/1.4
B23K 26/06 (2006.01) B23K 26/067 (2006.01) B23K 26/08 (2006.01) B23K 26/16 (2006.01)
Patent
CA 1239668
ABSTRACT An apparatus for applying optical energy to selectively re- move material carried upon a substrate, preferrably in substan- tially parallel lanes of material-free areas, which apparatus comprises an optical generator for generating optical energy in a primary beam, partitioning devices for dividing the primary beam into a plurality of derivative beams, reflective devices for re- flecting each of the derivative beams to form a plurality of work- ing beams which impact the substrate, focusing lenses for focus- ing each of the plurality of working beams upon the substrate, and transport means for transporting the substrate in a direction transverse of the plurality of working beams to effect continuous removal of material in substantially parallel lanes from the sub- strate by the working beams. In the preferred embodiment of the apparatus, phase retarders are utilized to shift the vector orien- tation of selected of the derivative beams in a manner whereby each of the working beams is of substantially equal intensity, a beam expander is used for diffusing the primary beam to reduce energy concentration upon optical elements of the apparatus. The lens assemblies are configured to focus the working beams upon the substrate in a substantially elliptical pattern, the major axis of which pattern is substantially aligned with the direction of transport of the substrate, and evacuating assemblies are asso- ciated with each working beam to evacuate removed material to preclude deposition of removed material upon the lens assemblies as well as to preclude impairment of focusing of the working beams upon the substrate.
456600
Flair Henry J.
Padgitt Howard R.
Rayburn Charles C.
Illinois Tool Works Inc.
Meredith & Finlayson
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