Laser welding method for automobile lamp and related automobile lamp

摘要

Method of manufacture of an automotive light (4) comprising the steps of providing a container body (8) delimited by a first perimetral profile (20), providing a lenticular body (24), internally delimited by a second perimetral profile (28) and externally by an outer edge (32) corresponding to said second perimetral profile (28), associating at least partially with each other the respective first and second perimetral profiles (20,28) of the container body (8) and the lenticular body (24), the contact surface between said perimetral profiles (20,28) defining a welding interface (48) which extends along a curve defined by a curvilinear abscissa (S), providing at least one laser emitting device which emits a light beam or radiation having a characteristic emission spectrum, providing a plurality of fibres (44) which receive portions of the laser beam from the laser emitter device and direct them towards the welding interface (36) through the lenticular body (24), - wherein the container body (8) acts as an absorbent element of the light beam and the lenticular body (24) acts as a transmission element of the light beam, providing optical devices (52) for changing the divergence of the portions of laser beams in output from the fibres (44), so as to collimate them overall along at least one predetermined optical axis (X-X). The method further comprises the steps of directing on a critical portion of the welding interface (36) at least a first laser beam (60) emitted by a respective fibre (44) lying on an optical plane (P) incident with said critical portion (64) of the welding interface (36), wherein the optical plane (P) identifies an angle of orientation (±) between 0 and 45 degrees with a plane (T) tangent to the critical portion (64) of the welding interface (36).