Patent ID: 9085048
Filing Date: 2015-07-21
Classification: B23K,C03B,H01L

Abstract:
1. Apparatus for generating separating fissures in a substrate through action of a laser beam with an elliptical beam cross section comprising a workpiece receptacle for receiving a substrate, a laser source for emitting a laser beam, a laser head with optics arranged downstream of the laser source in a beam output direction, having an optical axis, wherein the optical axis and, therefore, the laser beam are directed perpendicularly onto the surface of the received substrate, the optics being configured to shape the laser beam in such a way that it has an elliptical beam cross section and forms an elliptical beam spot on the surface of the substrate, said elliptical beam spot having a beam spot length and a beam spot width, a movement device for moving the laser head in a movement direction along a separating fissure which is to be generated in the received substrate and which has a start and an end, wherein the beam spot length is oriented along the movement direction, a control device for controlling the process flows, a blocking-out device provided in a diaphragm between the optics and the workpiece receptacle perpendicular to the optical axis which communicates with the laser head and which has a diaphragm with an aperture that can be varied with respect to the position and/or size thereof along the movement direction in order to cut off the laser beam in a continuously decreasing or increasing manner over the beam spot length so as to prevent the laser beam from impinging on the substrate before the start of a fissure and beyond the end of a fissure.