(57) A curved and one-sidedly open waveguide (20) for plastic welding, especially for
laser transmission welding, comprises a first reflecting element having a reflecting
surface (26) by means of which laser light can be reflected. The reflecting surface
(26) defines a receiving end (22) at which laser light from a laser light source,
in particular a light guide (10) or a plurality of light guides (10), is receivable,
and an output end (24) at which laser light is directable into a laser light transmitting
work piece (15). The reflecting surface (26) is defined by a curve between the receiving
end (22) and the output end (24) so that the reflecting surface (26) of the first
reflecting element has a continuously curved concave shape when viewed in cross-section.
Further, the first reflecting element is not opposed by a second reflecting element
so that the waveguide (20) is open in the direction normal to the reflecting surface
(26).
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