Abstract: The invention relates to a laser machining head (100) for machining a workpiece by means of a working laser beam (108), with a camera (102) with an imaging lens system (116) arranged in front of said camera in the beam path for observing a machining region of the workpiece that is being machined by means of the working laser beam (108), with a focusing lens system (114) for focusing the working laser beam (108) on the workpiece surface (104) or on a position defined in relation to the workpiece surface (104), and with an evaluation unit (122) which is designed to calculate a corrective adjusting displacement (?Zos, ?ZB) by means of an adjusting displacement (?dKL) of the imaging lens system (116) in the direction of the optical axis in order to refocus the camera image when there is a shift in the focal point of the focusing lens system (114), which corrective adjustment displacement compensates a shift in the focal point of the focusing lens system (114) in relation to the workpiece surface (104) or with res

Abstract: The invention relates to a device (10, 32, 56) for cutting a workpiece (12) by means of a working laser beam (14), comprising a housing (16), through which a path is made for the working laser beam (14) and which has a focusing lens (18) for focusing the working laser beam (14) onto the workpiece (12) to be cut within a working area (48), a lighting device (44) with a light source (46) for the incoherent lighting of the working area (48) of the workpiece (12) to be cut, a camera (32), coupled coaxially into the path of the working laser beam, for observing the working area (48) of the workpiece (12) to be cut, wherein an optical filter, which is substantially opaque to the working laser beam (14), is arranged ahead of the camera (32) in the path of the observation beam (22), and comprising a processing unit (56), which is designed for processing image data from the camera (32), in order to determine the geometry and quality of a slit (50) produced in the workpiece (12) by the working laser beam (14), wherein

Abstract: The invention relates to a method for monitoring a laser machining operation to be performed on a workpiece, comprising the following steps: detecting at least two current measured values by at least one sensor, which monitors the laser machining operation, determining at least two current characteristic values from the at least two current measured values, wherein the at least two current characteristic values jointly represent a current fingerprint in a characteristic value space, providing a predetermined point set in the characteristic value space, and classifying the laser machining operation by detecting the position of the current fingerprint relative to the predetermined point set in the characteristic value space, wherein the at least one sensor comprises at least one camera unit, which records camera images with different exposure times and processes them together by using a high dynamic range (HDR) method, in order to provide images having a high contrast ratio as the current measured values.

Abstract: The invention relates to a method for monitoring a laser machining operation to be performed on a workpiece, comprising the following steps: detecting at least two current measured values by at least one sensor, which monitors the laser machining operation, determining at least two current characteristic values from the at least two current measured values, wherein the at least two current characteristic values jointly represent a current fingerprint in a characteristic value space, providing a predetermined point set in a characteristic value space, and classifying the laser machining operation by detecting the position of the current fingerprint relative to the predetermined point set in the characteristic value space.