Patent DE-102009017900-A1 (DE)
Title: Laser processing head for hard soldering or welding by laser beam, comprises a housing in which a focusing optic for working laser beam is arranged, a wire routing head of a wire routing device holding in the housing, and a camera
Inventor: WASCHILOWSKY BERND
IPC: B23K3/06
Filed: 2009-04-17
Abstract: The laser processing head comprises a housing (10) in which a focusing optic (17) for working laser beam (14) is arranged, a wire routing head (27) of a wire routing device (26) holding in the housing, a camera (23) for monitoring a soldering- or welding seam, and a light section module that is held in the wire routing head in order to project a light line for detecting the contour of the soldering or welding seam on a workpiece. The wire routing head is arranged in the direction of the working laser beam and the focusing optic is movable over a suitable lever transmission. The laser processing head comprises a housing (10) in which a focusing optic (17) for working laser beam (14) is arranged, a wire routing head (27) of a wire routing device (26) holding in the housing, a camera (23) for monitoring a soldering- or welding seam, and a light section module that is held in the wire routing head in order to project a light line for detecting the contour of the soldering or welding seam on a workpiece. The wire routing head is arranged in the direction of the working laser beam and the focusing optic is movable over a suitable lever transmission corresponding to the adjustment of the wire routing head in order to adjust the working laser beam synchronically with the wire routing head. An objective of the camera is adjusted for monitoring the soldering or welding seam corresponding to the adjustment of the wire routing head or has a shading depth that corresponds to the adjusting area of the wire routing head in the direction of the working laser beam in order to guarantee a sufficient sharp image of the monitoring area. The light section module is mounted between a wire guidance and the housing on wire routing head and has an infrared laser light source and an out-coupling optic that produces a flat output light bundle diverging in a radial plain for forming the light line on the workpiece. A protective glass is arranged before the out-coupling optic and is associated to a gas supply device that releases a gas stream covering the protective glass. A cross-flow module for forming a gas curtain lying diagonally to optical axis is arranged for the protection of the focusing optic and the light section module is arranged on the side of the gas curtain turned away from the processing area. The camera is arranged in or on the housing and the light line observes through the focusing optic. The camera is arranged in directly straight extension of the optical axis of the focusing optic behind a deflecting mirror. A short pass filter adapted to the light source of the light section module is arranged before the camera or before its sensor. The light source of the light section module and/or the camera or its image sensor are connected with a control circuit for synchronizing light line production through the light source of the light section module and image reception through the camera.