Patent ID: 8237083
Filing Date: 2012-08-07
Classification: B23K,F02M

Abstract:
1. A method, for the drilling of holes in a workpiece within a diameter range of 20 μm to 500 μm by means of laser radiation, utilizing on the one hand, the beam quality of laser beam sources as well as, on the other hand, the polarization of said laser radiation, the parameters of the impulses of said laser used, and the type and the pressure of at least one process gas used, said method comprising the steps of: (a) focusing said laser radiation, in particular the ratio of the beam diameter at the site of the focusing element and its focal distance which preferably lies between 1 and 6, and wherein said focusing is done in coordination with a beam quality number K and a wave length λ; and (b) creating a bore hole with the length L whose shape is bottle-like and characterized by a smaller upper diameter d