Patent ID: 6539875
Filing Date: 2003-04-01
Classification: F42B

Abstract:
An electro-pyrotechnic initiator suitable for use in igniting a pyrotechnic generator of gas for inflating an air bag, said initiator being connected to an electric cable comprising two conductive wires, said initiator comprising:(i) a thermosensitive charge which is carried by a heating resistive element consisting of a resistive strip and which is initiatable by said heating resistive element, (ii) an electric circuit connecting said resistive element to said conductive wires, and (iii) means of electromagnetically protecting said electric circuit, wherein:a) said heating resistive element, said electric circuit and said means of electromagnetically protecting are integrated into a circuit of conductive strips which are joined to said conductive wires and which are printed on a support, b) said support is in the form of a thin parallelepipedal card with two opposite flat faces, c) said conductive strips are printed on the same face of said support to provide a complete circuit comprising said conductive strips, d) said complete circuit is located on only one face of said parallelepipedal card, e) said heating resistive element is covered by said thermosensitive charge, f) said support is coated with a substantially cylindrical overmoulded insulation except for a cut-out region exposing said thermosensitive charge, and g) said thermosensitive charge is protected by a fragmentable mask.