Patent ID: 8642919
Filing Date: 2014-02-04
Classification: B23K

Abstract:
1. A laser processing nozzle comprising: a pressure supply chamber to supply a process gas to a pressure chamber through which a stream of the process gas passes onto a substrate; a vacuum source chamber to provide vacuum suction to a vacuum chamber surrounding the pressure chamber and arranged to vacuum the process gas and ablation debris from the substrate; and at least one flow restrictor, the at least one flow restrictor comprising a constricted passageway and the constricted passageway being provided in: a process gas flow passage between a port and the pressure chamber through which the supply of process gas flows to the pressure chamber; a vacuum flow passage between a port leading from the vacuum chamber and the vacuum chamber, or both, such that either or both of the process gas flow passage or the vacuum flow passage are divided into two sub-areas at the nozzle.