Patent ID: 7897893
Filing Date: 2011-03-01
Classification: B23K,H05K

Abstract:
1. A method for laser drilling holes in a substrate, comprising: providing a laser beam having a beam spot diameter which is smaller than a diameter of a hole to be drilled; aligning the laser beam to a new hole; directing a beam axis in a jump direction predefined by a starting position to a center of the hole to be drilled; and directing the beam axis, with continuous movement, in a defined radial traversing movement away from the center and onto a defined circular path, wherein an angular direction of the traversing movement is defined as a function of the jump direction such that any change in direction of the beam axis at the center is less than or equal to a predefined maximum angle or else the direction is maintained, and wherein a number of fixed angular directions for the traversing movement is specified according to the predefined maximum angular range and wherein one of these angular directions is selected depending on the jump direction, and wherein the maximum angular range being 360°/2n, where n is an integer greater than 2, and wherein the laser is activated when the circular path is reached.