US 2006/0032839 A1 · Device for welding by means of laser radiation

Abstract

The invention is directed to a device by which two plastic parts can be welded together along their contacting joining surfaces (workpiece) quasi-simultaneously by laser radiation along a joining contour. The beam bundle emitted by a laser diode is coupled into a first gradient index lens by a light-conducting fiber. The first gradient index lens concentrates the beam bundle on a workpiece surface, this first gradient index lens being deflected relative to the exit surface of the light-conducting fiber so that the beam bundle scans a joining contour on the workpiece surface in order to heat, plasticize and weld the workpiece quasi-simultaneously. A plurality of such devices may be put together to form a more complex device in order to apply radiation to larger joining contours simultaneously and quasi-simultaneously.

Claims10

Dependent claims

1-9. (canceled)

A device for welding a joining contour by laser radiation, comprising:

a laser diode;
a light-conducting fiber which is arranged in front with reference to the radiating direction of the laser diode, the beam bundle emitted by the laser diode being coupled into an entrance surface of the light-conducting fiber and an exit surface of the light-conducting fiber being arranged in front of a beam-shaping optical unit with reference to the direction of radiation so that the beam bundle images a focal spot, by way of the beam-shaping optical unit, on a workpiece surface arranged downstream of the beam-shaping optical unit;
said beam-shaping optical unit comprising at least one gradient index lens which is connected to at least one linear movement unit by which the gradient index lens is deflected radial to the exit surface by a displacement path in order to generate a deflection of the beam bundle so that the focal spot scans a joining contour on the workpiece surface.

Dependencies are inferred from the claim text.

Facts

Application

10/529,930Filed 10 Sep 2003

Priority

DE 102 46 198.81 Oct 2002

Published

16 Feb 2006

Term ends

Not estimatedThe source records don’t support an estimate.

Classification13 codes

B29C 65/1674
Characterised by the way of heating the interface: making use of laser diodes
B23K 26/064
Shaping the laser beam, e.g. by masks or multi-focusing: by means of optical elements, e.g. lenses, mirrors or prisms
B23K 26/0648
By means of optical elements, e.g. lenses, mirrors or prisms: comprising lenses
B23K 26/08
Working by laser beam, e.g. welding, cutting or boring: devices involving relative movement between laser beam and workpiece

Device for welding by means of laser radiation

Life of this patent

Device for welding by means of laser radiation

Life of this patent

Abstract

Claims10